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Schedule III - Real Estate and Accumulated Depreciation (Details) | 12 Months Ended |  |  |
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Dec. 31, 2017 USD ($) ApartmentUnit | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Accumulated Depreciation | $ (6,040,378,000) | $ (5,360,389,000) | $ (6,084,616,000) | $ (5,432,805,000)
100 K Street [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 15,600,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 30,003,159 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 15,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 30,003,159 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 45,603,159 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 45,603,159 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
140 Riverside Boulevard [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 354 |  |  |
Initial Cost to Company, Land | $ 103,539,100 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 94,082,725 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 8,607,947 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 103,539,100 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 102,690,672 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 206,229,772 |  |  |
Accumulated Depreciation | (44,828,691) |  |  |
Investment in Real Estate, Net | 161,401,081 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
160 Riverside Boulevard [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 455 |  |  |
Initial Cost to Company, Land | $ 139,933,500 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 190,964,745 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 14,965,349 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 139,933,500 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 205,930,094 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 345,863,594 |  |  |
Accumulated Depreciation | (89,280,987) |  |  |
Investment in Real Estate, Net | 256,582,607 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
170 Amsterdam [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 236 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 112,081,768 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 135,722 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 112,217,490 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 112,217,490 |  |  |
Accumulated Depreciation | (11,505,275) |  |  |
Investment in Real Estate, Net | 100,712,215 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
175 Kent [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Brooklyn, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 113 |  |  |
Initial Cost to Company, Land | $ 22,037,831 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 53,962,169 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,534,419 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 22,037,831 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 55,496,588 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 77,534,419 |  |  |
Accumulated Depreciation | (14,450,457) |  |  |
Investment in Real Estate, Net | 63,083,962 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
180 Montague (fka Brooklyn Heights) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Brooklyn, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 193 |  |  |
Initial Cost to Company, Land | $ 32,400,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 92,675,228 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,547,996 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 32,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 96,223,224 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 128,623,224 |  |  |
Accumulated Depreciation | (20,134,074) |  |  |
Investment in Real Estate, Net | 108,489,150 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
180 Riverside Boulevard [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 516 |  |  |
Initial Cost to Company, Land | $ 144,968,250 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 138,346,681 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 12,874,009 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 144,968,250 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 151,220,690 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 296,188,940 |  |  |
Accumulated Depreciation | (67,181,115) |  |  |
Investment in Real Estate, Net | 229,007,825 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
1111 Belle Pre (fka The Madison) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Alexandria, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 360 |  |  |
Initial Cost to Company, Land | $ 18,937,702 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 94,759,478 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 148,954 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 18,937,702 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 94,908,432 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 113,846,134 |  |  |
Accumulated Depreciation | (17,565,898) |  |  |
Investment in Real Estate, Net | 96,280,236 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
1210 Mass [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 144 |  |  |
Initial Cost to Company, Land | $ 9,213,513 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 36,559,189 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,403,479 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 9,213,513 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 38,962,668 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 48,176,181 |  |  |
Accumulated Depreciation | (16,940,349) |  |  |
Investment in Real Estate, Net | 31,235,832 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
1401 E. Madison [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 10,401,958 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 7,932,051 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 10,401,958 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 7,932,051 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 18,334,009 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 18,334,009 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
1500 Mass Ave [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 556 |  |  |
Initial Cost to Company, Land | $ 54,638,298 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 40,361,702 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 14,859,237 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 54,638,298 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 55,220,939 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 109,859,237 |  |  |
Accumulated Depreciation | (24,493,269) |  |  |
Investment in Real Estate, Net | 85,365,968 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
1800 Oak (fka Rosslyn) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 314 |  |  |
Initial Cost to Company, Land | $ 31,400,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 109,005,734 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,172,464 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 31,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 112,178,198 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 143,578,198 |  |  |
Accumulated Depreciation | (23,997,938) |  |  |
Investment in Real Estate, Net | 119,580,260 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
2201 Pershing Drive [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 188 |  |  |
Initial Cost to Company, Land | $ 11,321,198 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 49,674,175 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,176,089 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 11,321,198 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 51,850,264 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 63,171,462 |  |  |
Accumulated Depreciation | (11,636,674) |  |  |
Investment in Real Estate, Net | 51,534,788 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
2201 Wilson [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 219 |  |  |
Initial Cost to Company, Land | $ 21,900,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 78,724,663 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,493,731 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 21,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 82,218,394 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 104,118,394 |  |  |
Accumulated Depreciation | (17,067,795) |  |  |
Investment in Real Estate, Net | 87,050,599 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
M St 2400 [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 359 |  |  |
Initial Cost to Company, Land | $ 30,006,593 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 114,013,785 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,296,314 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 30,006,593 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 118,310,099 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 148,316,692 |  |  |
Accumulated Depreciation | (49,487,043) |  |  |
Investment in Real Estate, Net | 98,829,649 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
249 Third Street (fka Kendall Square II) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Cambridge, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 4,603,326 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 4,330,982 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 4,603,326 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 4,330,982 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 8,934,308 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 8,934,308 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
315 on A [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Boston, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 202 |  |  |
Initial Cost to Company, Land | $ 14,450,070 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 115,824,930 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 623,402 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 14,450,070 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 116,448,332 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 130,898,402 |  |  |
Accumulated Depreciation | (14,489,301) |  |  |
Investment in Real Estate, Net | 116,409,101 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
340 Fremont [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Francisco, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 348 |  |  |
Initial Cost to Company, Land | $ 42,000,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 247,606,631 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,551 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 42,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 247,611,182 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 289,611,182 |  |  |
Accumulated Depreciation | (14,159,585) |  |  |
Investment in Real Estate, Net | 275,451,597 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
3003 Van Ness [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 625 |  |  |
Initial Cost to Company, Land | $ 56,300,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 141,191,580 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,117,966 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 56,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 146,309,546 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 202,609,546 |  |  |
Accumulated Depreciation | (33,088,622) |  |  |
Investment in Real Estate, Net | 169,520,924 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
45 Worthington [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Boston, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 2,349,475 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 2,349,475 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 2,349,475 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 2,349,475 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
420 East 80th Street [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 155 |  |  |
Initial Cost to Company, Land | $ 39,277,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 23,026,984 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,675,293 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 39,277,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 27,702,277 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 66,979,277 |  |  |
Accumulated Depreciation | (13,594,720) |  |  |
Investment in Real Estate, Net | 53,384,557 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
425 Mass [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 559 |  |  |
Initial Cost to Company, Land | $ 28,150,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 138,600,000 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,974,856 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 28,150,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 142,574,856 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 170,724,856 |  |  |
Accumulated Depreciation | (44,144,101) |  |  |
Investment in Real Estate, Net | 126,580,755 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
455 I Street [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 174 |  |  |
Initial Cost to Company, Land | $ 11,941,407 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 61,030,786 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 11,941,407 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 61,030,786 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 72,972,193 |  |  |
Accumulated Depreciation | (1,082,263) |  |  |
Investment in Real Estate, Net | 71,889,930 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
4885 Edgemoor Lane [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Bethesda, MD |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 1,958,883 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 1,958,883 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 1,958,883 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 1,958,883 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
4701 Willard [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Chevy Chase, MD |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 517 |  |  |
Initial Cost to Company, Land | $ 76,921,130 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 153,947,682 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 29,902,775 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 76,921,130 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 183,850,457 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 260,771,587 |  |  |
Accumulated Depreciation | (50,471,131) |  |  |
Investment in Real Estate, Net | 210,300,456 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
4th and Hill [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 13,131,456 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 13,790,436 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 13,131,456 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 13,790,436 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 26,921,892 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 26,921,892 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
600 Washington [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 135 |  |  |
Initial Cost to Company, Land | $ 32,852,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 43,140,551 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 870,871 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 32,852,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 44,011,422 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 76,863,422 |  |  |
Accumulated Depreciation | (19,355,357) |  |  |
Investment in Real Estate, Net | 57,508,065 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
660 Washington [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Boston, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 420 |  |  |
Initial Cost to Company, Land | $ 106,100,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 166,311,679 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,888,133 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 106,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 169,199,812 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 275,299,812 |  |  |
Accumulated Depreciation | (35,392,580) |  |  |
Investment in Real Estate, Net | 239,907,232 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
70 Greene [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Jersey City, NJ |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 480 |  |  |
Initial Cost to Company, Land | $ 28,108,899 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 236,763,553 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,657,070 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 28,108,899 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 238,420,623 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 266,529,522 |  |  |
Accumulated Depreciation | (65,784,128) |  |  |
Investment in Real Estate, Net | 200,745,394 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
71 Broadway [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 238 |  |  |
Initial Cost to Company, Land | $ 22,611,600 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 77,492,171 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 14,064,394 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 22,611,600 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 91,556,565 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 114,168,165 |  |  |
Accumulated Depreciation | (43,472,173) |  |  |
Investment in Real Estate, Net | 70,695,992 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
77 Bluxome [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Francisco, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 102 |  |  |
Initial Cost to Company, Land | $ 5,249,124 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 18,609,876 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 402,201 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,249,124 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 19,012,077 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 24,261,201 |  |  |
Accumulated Depreciation | (5,178,232) |  |  |
Investment in Real Estate, Net | 19,082,969 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
77 Park Avenue (fka Hoboken) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Hoboken, NJ |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 301 |  |  |
Initial Cost to Company, Land | $ 27,900,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 168,992,440 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,060,186 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 27,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 175,052,626 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 202,952,626 |  |  |
Accumulated Depreciation | (35,032,130) |  |  |
Investment in Real Estate, Net | 167,920,496 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
777 Sixth [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 294 |  |  |
Initial Cost to Company, Land | $ 65,352,706 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 65,747,294 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,136,354 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 65,352,706 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 68,883,648 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 134,236,354 |  |  |
Accumulated Depreciation | (26,152,102) |  |  |
Investment in Real Estate, Net | 108,084,252 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
88 Hillside [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Daly City, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 95 |  |  |
Initial Cost to Company, Land | $ 7,786,800 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 31,587,325 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,479,165 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 7,786,800 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 34,066,490 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 41,853,290 |  |  |
Accumulated Depreciation | (8,687,690) |  |  |
Investment in Real Estate, Net | 33,165,600 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
855 Brannan [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Francisco, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 41,363,921 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 255,551,895 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 249 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 41,363,921 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 255,552,144 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 296,916,065 |  |  |
Accumulated Depreciation | (1,845,523) |  |  |
Investment in Real Estate, Net | 295,070,542 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Acton Courtyard [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Berkeley, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 71 |  |  |
Initial Cost to Company, Land | $ 5,550,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 15,785,509 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 215,312 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,550,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 16,000,821 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 21,550,821 |  |  |
Accumulated Depreciation | (6,583,929) |  |  |
Investment in Real Estate, Net | 14,966,892 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Alban Towers [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 229 |  |  |
Initial Cost to Company, Land | $ 18,900,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 89,794,201 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,280,842 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 18,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 93,075,043 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 111,975,043 |  |  |
Accumulated Depreciation | (18,879,861) |  |  |
Investment in Real Estate, Net | 93,095,182 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Acappella [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Pasadena, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 143 |  |  |
Initial Cost to Company, Land | $ 5,839,548 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 29,360,452 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,048,185 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,839,548 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,408,637 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 37,248,185 |  |  |
Accumulated Depreciation | (10,041,304) |  |  |
Investment in Real Estate, Net | 27,206,881 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Altitude [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 545 |  |  |
Initial Cost to Company, Land | $ 43,783,485 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 147,964,006 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 61,899 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 43,783,485 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 148,025,905 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 191,809,390 |  |  |
Accumulated Depreciation | (8,474,037) |  |  |
Investment in Real Estate, Net | 183,335,353 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Alton, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Irvine, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 344 |  |  |
Initial Cost to Company, Land | $ 11,049,027 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 95,745,832 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,433 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 11,049,027 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 95,750,265 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 106,799,292 |  |  |
Accumulated Depreciation | (3,470,417) |  |  |
Investment in Real Estate, Net | 103,328,875 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Arbor Terrace [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Sunnyvale, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 175 |  |  |
Initial Cost to Company, Land | $ 9,057,300 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 18,483,642 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 7,806,335 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 9,057,300 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,289,977 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,347,277 |  |  |
Accumulated Depreciation | (15,015,023) |  |  |
Investment in Real Estate, Net | 20,332,254 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Alborada [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Fremont, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 442 |  |  |
Initial Cost to Company, Land | $ 24,310,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 59,214,129 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 9,118,031 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 24,310,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 68,332,160 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 92,642,160 |  |  |
Accumulated Depreciation | (39,048,480) |  |  |
Investment in Real Estate, Net | 53,593,680 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Artech Building [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Berkeley, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 27 |  |  |
Initial Cost to Company, Land | $ 1,642,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 9,152,518 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 493,478 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 1,642,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 9,645,996 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 11,287,996 |  |  |
Accumulated Depreciation | (3,706,713) |  |  |
Investment in Real Estate, Net | 7,581,283 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Artisan on Second [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 118 |  |  |
Initial Cost to Company, Land | $ 8,000,400 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 36,074,600 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 880,695 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 8,000,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 36,955,295 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 44,955,695 |  |  |
Accumulated Depreciation | (10,464,974) |  |  |
Investment in Real Estate, Net | 34,490,721 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Artistry Emeryville (fka Emeryville) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Emeryville, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 261 |  |  |
Initial Cost to Company, Land | $ 12,300,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 61,466,267 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,320,134 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 12,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 65,786,401 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 78,086,401 |  |  |
Accumulated Depreciation | (14,859,853) |  |  |
Investment in Real Estate, Net | 63,226,548 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Atelier [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Brooklyn, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 120 |  |  |
Initial Cost to Company, Land | $ 32,401,680 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 47,135,432 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 276,205 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 32,401,680 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 47,411,637 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 79,813,317 |  |  |
Accumulated Depreciation | (4,883,375) |  |  |
Investment in Real Estate, Net | 74,929,942 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Avenue Two [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Redwood City, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 123 |  |  |
Initial Cost to Company, Land | $ 7,995,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 18,005,000 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,027,422 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 7,995,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 20,032,422 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 28,027,422 |  |  |
Accumulated Depreciation | (5,941,287) |  |  |
Investment in Real Estate, Net | 22,086,135 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Azure [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Francisco, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 273 |  |  |
Initial Cost to Company, Land | $ 32,855,115 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 152,627,844 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 141,813 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 32,855,115 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 152,769,657 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 185,624,772 |  |  |
Accumulated Depreciation | (13,532,368) |  |  |
Investment in Real Estate, Net | 172,092,404 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Bella Fontaine [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Marina Del Rey, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 102 |  |  |
Initial Cost to Company, Land | $ 9,098,808 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 28,701,192 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 771,386 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 9,098,808 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 29,472,578 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 38,571,386 |  |  |
Accumulated Depreciation | (7,870,020) |  |  |
Investment in Real Estate, Net | 30,701,366 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Bay Hill [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Long Beach, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 160 |  |  |
Initial Cost to Company, Land | $ 7,600,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 27,437,239 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,327,400 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 7,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 30,764,639 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 38,364,639 |  |  |
Accumulated Depreciation | (14,290,928) |  |  |
Investment in Real Estate, Net | 24,073,711 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Breakwater at Marina Del Rey [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Marina Del Rey, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 224 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 73,189,262 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,974,133 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 75,163,395 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 75,163,395 |  |  |
Accumulated Depreciation | (17,008,793) |  |  |
Investment in Real Estate, Net | 58,154,602 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Beatrice, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 302 |  |  |
Initial Cost to Company, Land | $ 114,351,405 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 165,648,595 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,368,317 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 114,351,405 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 167,016,912 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 281,368,317 |  |  |
Accumulated Depreciation | (40,862,593) |  |  |
Investment in Real Estate, Net | 240,505,724 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Briarwood (CA) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Sunnyvale, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 192 |  |  |
Initial Cost to Company, Land | $ 9,991,500 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 22,247,278 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,973,927 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 9,991,500 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,221,205 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 36,212,705 |  |  |
Accumulated Depreciation | (16,926,737) |  |  |
Investment in Real Estate, Net | 19,285,968 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Belle Arts Condominium Homes, LLC [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Bellevue, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 1 |  |  |
Initial Cost to Company, Land | $ 63,158 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 236,157 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,098 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 63,158 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 238,255 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 301,413 |  |  |
Accumulated Depreciation | (75,056) |  |  |
Investment in Real Estate, Net | 226,357 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Bridford Lakes Two [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Greensboro, NC |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 200,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 0 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 200,000 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 200,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Brooklyner (fka 111 Lawrence) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Brooklyn, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 490 |  |  |
Initial Cost to Company, Land | $ 40,099,922 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 221,438,631 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,859,816 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 40,099,922 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 224,298,447 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 264,398,369 |  |  |
Accumulated Depreciation | (53,947,636) |  |  |
Investment in Real Estate, Net | 210,450,733 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
C on Pico [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 94 |  |  |
Initial Cost to Company, Land | $ 17,125,766 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 28,074,234 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 63,493 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 17,125,766 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 28,137,727 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 45,263,493 |  |  |
Accumulated Depreciation | (2,749,575) |  |  |
Investment in Real Estate, Net | 42,513,918 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Carlyle Mill [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Alexandria, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 317 |  |  |
Initial Cost to Company, Land | $ 10,000,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 51,367,913 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 8,305,516 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 10,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 59,673,429 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 69,673,429 |  |  |
Accumulated Depreciation | (30,572,284) |  |  |
Investment in Real Estate, Net | 39,101,145 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Cascade [Domain] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 477 |  |  |
Initial Cost to Company, Land | $ 23,751,564 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 145,844,715 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 23,751,564 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 145,844,715 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 169,596,279 |  |  |
Accumulated Depreciation | (2,364,423) |  |  |
Investment in Real Estate, Net | 167,231,856 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Centennial (fka Centennial Court & Centennial Tower) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 408 |  |  |
Initial Cost to Company, Land | $ 9,700,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 70,080,378 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 11,471,751 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 9,700,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 81,552,129 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 91,252,129 |  |  |
Accumulated Depreciation | (36,965,435) |  |  |
Investment in Real Estate, Net | 54,286,694 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Centre Club [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Ontario, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 412 |  |  |
Initial Cost to Company, Land | $ 7,436,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 33,014,789 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 8,651,651 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 7,436,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 41,666,440 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 49,102,440 |  |  |
Accumulated Depreciation | (23,210,064) |  |  |
Investment in Real Estate, Net | 25,892,376 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Church Corner [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Cambridge, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 85 |  |  |
Initial Cost to Company, Land | $ 5,220,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 16,744,643 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,757,280 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,220,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 19,501,923 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 24,721,923 |  |  |
Accumulated Depreciation | (9,327,871) |  |  |
Investment in Real Estate, Net | 15,394,052 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
City Gate at Cupertino (fka Cupertino) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Cupertino, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 311 |  |  |
Initial Cost to Company, Land | $ 40,400,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 95,937,046 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 7,063,652 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 40,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 103,000,698 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 143,400,698 |  |  |
Accumulated Depreciation | (21,491,582) |  |  |
Investment in Real Estate, Net | 121,909,116 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
City Pointe [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Fullerton, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 183 |  |  |
Initial Cost to Company, Land | $ 6,863,792 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 36,476,208 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,132,781 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 6,863,792 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,608,989 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 44,472,781 |  |  |
Accumulated Depreciation | (12,911,899) |  |  |
Investment in Real Estate, Net | 31,560,882 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
City Square Bellevue (fka Bellevue) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Bellevue, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 191 |  |  |
Initial Cost to Company, Land | $ 15,100,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 41,876,257 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,341,276 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 15,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,217,533 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 60,317,533 |  |  |
Accumulated Depreciation | (9,816,078) |  |  |
Investment in Real Estate, Net | 50,501,455 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
CityView at Longwood [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Boston, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 295 |  |  |
Initial Cost to Company, Land | $ 14,704,898 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 79,195,102 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 12,908,253 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 14,704,898 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 92,103,355 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 106,808,253 |  |  |
Accumulated Depreciation | (29,583,293) |  |  |
Investment in Real Estate, Net | 77,224,960 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Clarendon, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 292 |  |  |
Initial Cost to Company, Land | $ 30,400,340 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 103,824,660 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,206,298 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 30,400,340 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 106,030,958 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 136,431,298 |  |  |
Accumulated Depreciation | (30,102,780) |  |  |
Investment in Real Estate, Net | 106,328,518 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Cleo, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 92 |  |  |
Initial Cost to Company, Land | $ 6,615,467 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 14,829,335 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,872,824 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 6,615,467 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,702,159 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 25,317,626 |  |  |
Accumulated Depreciation | (8,706,067) |  |  |
Investment in Real Estate, Net | 16,611,559 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Connecticut Heights [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 518 |  |  |
Initial Cost to Company, Land | $ 27,600,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 114,002,295 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,582,335 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 27,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 120,584,630 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 148,184,630 |  |  |
Accumulated Depreciation | (24,518,831) |  |  |
Investment in Real Estate, Net | 123,665,799 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Corcoran House at DuPont Circle (fka DuPont Circle) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 138 |  |  |
Initial Cost to Company, Land | $ 13,500,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 26,913,113 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,863,273 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 13,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 28,776,386 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 42,276,386 |  |  |
Accumulated Depreciation | (6,924,238) |  |  |
Investment in Real Estate, Net | 35,352,148 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Courthouse Plaza [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 396 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 87,386,024 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,468,028 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 92,854,052 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 92,854,052 |  |  |
Accumulated Depreciation | (21,556,859) |  |  |
Investment in Real Estate, Net | 71,297,193 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Creekside (San Mateo) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Mateo, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 192 |  |  |
Initial Cost to Company, Land | $ 9,606,600 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 21,193,231 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,232,377 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 9,606,600 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 25,425,608 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,032,208 |  |  |
Accumulated Depreciation | (16,783,870) |  |  |
Investment in Real Estate, Net | 18,248,338 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Cronins Landing [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Waltham, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 281 |  |  |
Initial Cost to Company, Land | $ 32,300,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 85,119,324 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,002,941 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 32,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 91,122,265 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 123,422,265 |  |  |
Accumulated Depreciation | (19,414,857) |  |  |
Investment in Real Estate, Net | 104,007,408 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Crystal Place [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 181 |  |  |
Initial Cost to Company, Land | $ 17,200,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 47,918,975 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,541,443 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 17,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 51,460,418 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 68,660,418 |  |  |
Accumulated Depreciation | (11,376,670) |  |  |
Investment in Real Estate, Net | 57,283,748 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Eagle Canyon [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Chino Hills, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 252 |  |  |
Initial Cost to Company, Land | $ 1,808,900 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 16,274,361 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 9,576,378 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 1,808,900 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 25,850,739 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 27,659,639 |  |  |
Accumulated Depreciation | (18,419,631) |  |  |
Investment in Real Estate, Net | 9,240,008 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Edgemont at Bethesda Metro [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Bethesda, MD |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 122 |  |  |
Initial Cost to Company, Land | $ 13,092,552 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 43,907,448 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,433,098 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 13,092,552 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,340,546 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 58,433,098 |  |  |
Accumulated Depreciation | (11,970,483) |  |  |
Investment in Real Estate, Net | 46,462,615 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Elevé [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Glendale, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 208 |  |  |
Initial Cost to Company, Land | $ 14,080,560 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 56,419,440 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 574,833 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 14,080,560 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 56,994,273 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 71,074,833 |  |  |
Accumulated Depreciation | (9,935,529) |  |  |
Investment in Real Estate, Net | 61,139,304 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Emerson Place [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Boston, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 444 |  |  |
Initial Cost to Company, Land | $ 14,855,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 57,566,636 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 27,713,125 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 14,855,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 85,279,761 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 100,134,761 |  |  |
Accumulated Depreciation | (55,294,608) |  |  |
Investment in Real Estate, Net | 44,840,153 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Encore at Sherman Oaks, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Sherman Oaks, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 174 |  |  |
Initial Cost to Company, Land | $ 8,700,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 25,446,003 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,503,675 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 8,700,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,949,678 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,649,678 |  |  |
Accumulated Depreciation | (8,805,442) |  |  |
Investment in Real Estate, Net | 26,844,236 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Fountains at Emerald Park (fka Emerald Park) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Dublin, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 324 |  |  |
Initial Cost to Company, Land | $ 25,900,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 83,986,217 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,101,209 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 25,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 85,087,426 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 110,987,426 |  |  |
Accumulated Depreciation | (18,972,556) |  |  |
Investment in Real Estate, Net | 92,014,870 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Fremont Center [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Fremont, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 322 |  |  |
Initial Cost to Company, Land | $ 25,800,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 78,753,114 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,691,593 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 25,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 82,444,707 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 108,244,707 |  |  |
Accumulated Depreciation | (18,108,606) |  |  |
Investment in Real Estate, Net | 90,136,101 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Gallery, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Hermosa Beach, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 169 |  |  |
Initial Cost to Company, Land | $ 18,144,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 46,567,941 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,765,229 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 18,144,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 49,333,170 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 67,477,170 |  |  |
Accumulated Depreciation | (21,549,332) |  |  |
Investment in Real Estate, Net | 45,927,838 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Garden Garage [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Boston, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 12,858,392 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 12,858,392 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 12,858,392 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 12,858,392 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Gateway at Malden Center [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Malden, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 203 |  |  |
Initial Cost to Company, Land | $ 9,209,780 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 25,722,666 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 14,271,535 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 9,209,780 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 39,994,201 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 49,203,981 |  |  |
Accumulated Depreciation | (23,167,536) |  |  |
Investment in Real Estate, Net | 26,036,445 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Geary Court Yard [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Francisco, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 164 |  |  |
Initial Cost to Company, Land | $ 1,722,400 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 15,471,429 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,981,389 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 1,722,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 20,452,818 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 22,175,218 |  |  |
Accumulated Depreciation | (13,455,847) |  |  |
Investment in Real Estate, Net | 8,719,371 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Hampshire Place [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 259 |  |  |
Initial Cost to Company, Land | $ 10,806,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 30,335,330 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,889,198 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 10,806,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 36,224,528 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 47,030,528 |  |  |
Accumulated Depreciation | (16,825,383) |  |  |
Investment in Real Estate, Net | 30,205,145 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Girard [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Boston, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 160 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 102,450,329 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 412,971 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 102,863,300 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 102,863,300 |  |  |
Accumulated Depreciation | (2,991,518) |  |  |
Investment in Real Estate, Net | 99,871,782 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Harbor Steps [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 758 |  |  |
Initial Cost to Company, Land | $ 59,387,158 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 158,829,432 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 28,544,042 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 59,387,158 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 187,373,474 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 246,760,632 |  |  |
Accumulated Depreciation | (80,511,164) |  |  |
Investment in Real Estate, Net | 166,249,468 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Helios/1610 2nd Avenue [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 398 |  |  |
Initial Cost to Company, Land | $ 18,061,674 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 202,039,273 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 18,061,674 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 202,039,273 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 220,100,947 |  |  |
Accumulated Depreciation | (3,845,290) |  |  |
Investment in Real Estate, Net | 216,255,657 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Heritage at Stone Ridge [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Burlington, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 180 |  |  |
Initial Cost to Company, Land | $ 10,800,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 31,808,335 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,313,536 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 10,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 34,121,871 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 44,921,871 |  |  |
Accumulated Depreciation | (15,330,866) |  |  |
Investment in Real Estate, Net | 29,591,005 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Heritage Ridge [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Lynwood, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 197 |  |  |
Initial Cost to Company, Land | $ 6,895,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 18,983,597 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,339,062 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 6,895,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,322,659 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 29,217,659 |  |  |
Accumulated Depreciation | (10,066,945) |  |  |
Investment in Real Estate, Net | 19,150,714 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Hesby [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | North Hollywood, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 308 |  |  |
Initial Cost to Company, Land | $ 23,299,892 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 102,700,108 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 575,827 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 23,299,892 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 103,275,935 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 126,575,827 |  |  |
Accumulated Depreciation | (17,235,969) |  |  |
Investment in Real Estate, Net | 109,339,858 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Highlands At South Plainfield [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | South Plainfield, NJ |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 252 |  |  |
Initial Cost to Company, Land | $ 10,080,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 37,526,912 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,968,410 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 10,080,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 39,495,322 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 49,575,322 |  |  |
Accumulated Depreciation | (17,281,612) |  |  |
Investment in Real Estate, Net | 32,293,710 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Hikari [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 128 |  |  |
Initial Cost to Company, Land | $ 9,435,760 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 32,564,240 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 813,913 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 9,435,760 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 33,378,153 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 42,813,913 |  |  |
Accumulated Depreciation | (9,383,982) |  |  |
Investment in Real Estate, Net | 33,429,931 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Hudson Crossing [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 259 |  |  |
Initial Cost to Company, Land | $ 23,420,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 69,977,699 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,333,449 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 23,420,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 72,311,148 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 95,731,148 |  |  |
Accumulated Depreciation | (33,463,902) |  |  |
Investment in Real Estate, Net | 62,267,246 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Hudson Pointe [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Jersey City, NJ |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 182 |  |  |
Initial Cost to Company, Land | $ 5,350,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 41,114,074 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,026,931 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,350,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 47,141,005 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 52,491,005 |  |  |
Accumulated Depreciation | (22,111,343) |  |  |
Investment in Real Estate, Net | 30,379,662 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Hunt Club II [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Charlotte, NC |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 100,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 0 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 100,000 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 100,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Ivory Wood [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Bothell, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 144 |  |  |
Initial Cost to Company, Land | $ 2,732,800 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 13,888,282 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,259,914 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 2,732,800 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 15,148,196 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 17,880,996 |  |  |
Accumulated Depreciation | (7,400,504) |  |  |
Investment in Real Estate, Net | 10,480,492 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Jia [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 280 |  |  |
Initial Cost to Company, Land | $ 14,791,831 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 77,426,315 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 281,313 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 14,791,831 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 77,707,628 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 92,499,459 |  |  |
Accumulated Depreciation | (15,513,371) |  |  |
Investment in Real Estate, Net | 76,986,088 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Junction 47 (fka West Seattle) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 206 |  |  |
Initial Cost to Company, Land | $ 11,726,305 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 56,108,989 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 36,260 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 11,726,305 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 56,145,249 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 67,871,554 |  |  |
Accumulated Depreciation | (5,156,854) |  |  |
Investment in Real Estate, Net | 62,714,700 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Kelvin, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Irvine, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 194 |  |  |
Initial Cost to Company, Land | $ 15,521,552 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 64,853,448 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 385,466 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 15,521,552 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 65,238,914 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 80,760,466 |  |  |
Accumulated Depreciation | (7,677,409) |  |  |
Investment in Real Estate, Net | 73,083,057 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Landings at Port Imperial [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | W. New York, NJ |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 276 |  |  |
Initial Cost to Company, Land | $ 27,246,045 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 37,741,050 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 10,790,636 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 27,246,045 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 48,531,686 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 75,777,731 |  |  |
Accumulated Depreciation | (29,235,083) |  |  |
Investment in Real Estate, Net | 46,542,648 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Lincoln Heights [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Quincy, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 336 |  |  |
Initial Cost to Company, Land | $ 5,928,400 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 33,595,262 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 13,797,904 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,928,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 47,393,166 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 53,321,566 |  |  |
Accumulated Depreciation | (34,170,500) |  |  |
Investment in Real Estate, Net | 19,151,066 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Lindley Apartments [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Encino, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 129 |  |  |
Initial Cost to Company, Land | $ 5,805,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 25,705,000 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,086,410 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,805,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,791,410 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 32,596,410 |  |  |
Accumulated Depreciation | (8,393,740) |  |  |
Investment in Real Estate, Net | 24,202,670 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Loft 590 [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 212 |  |  |
Initial Cost to Company, Land | $ 20,100,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 67,909,023 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 688,579 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 20,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 68,597,602 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 88,697,602 |  |  |
Accumulated Depreciation | (13,789,656) |  |  |
Investment in Real Estate, Net | 74,907,946 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Lofts at Kendall Square (fka Kendall Square) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Cambridge, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 186 |  |  |
Initial Cost to Company, Land | $ 18,696,674 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 78,445,657 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,737,350 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 18,696,674 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 84,183,007 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 102,879,681 |  |  |
Accumulated Depreciation | (17,496,435) |  |  |
Investment in Real Estate, Net | 85,383,246 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Longacre House [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 293 |  |  |
Initial Cost to Company, Land | $ 73,170,045 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 53,962,510 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,572,439 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 73,170,045 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 56,534,949 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 129,704,994 |  |  |
Accumulated Depreciation | (22,561,960) |  |  |
Investment in Real Estate, Net | 107,143,034 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Longfellow Place [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Boston, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 710 |  |  |
Initial Cost to Company, Land | $ 47,096,917 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 150,143,916 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 86,838,642 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 47,096,917 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 236,982,558 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 284,079,475 |  |  |
Accumulated Depreciation | (154,305,979) |  |  |
Investment in Real Estate, Net | 129,773,496 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Mantena [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 98 |  |  |
Initial Cost to Company, Land | $ 22,346,513 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 61,501,158 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 813,638 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 22,346,513 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 62,314,796 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 84,661,309 |  |  |
Accumulated Depreciation | (13,828,043) |  |  |
Investment in Real Estate, Net | 70,833,266 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Marina 41 (fka Marina Del Rey) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Marina Del Rey, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 623 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 168,842,442 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,492,153 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 175,334,595 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 175,334,595 |  |  |
Accumulated Depreciation | (40,843,073) |  |  |
Investment in Real Estate, Net | 134,491,522 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Mariposa at Playa Del Rey (fka Playa Del Rey) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Playa Del Rey, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 354 |  |  |
Initial Cost to Company, Land | $ 60,900,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 89,311,482 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,201,127 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 60,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 94,512,609 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 155,412,609 |  |  |
Accumulated Depreciation | (21,025,902) |  |  |
Investment in Real Estate, Net | 134,386,707 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Milano Lofts [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 99 |  |  |
Initial Cost to Company, Land | $ 8,125,216 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 27,378,784 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,088,041 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 8,125,216 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 28,466,825 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 36,592,041 |  |  |
Accumulated Depreciation | (6,979,083) |  |  |
Investment in Real Estate, Net | 29,612,958 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Mosaic at Metro [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Hyattsville, MD |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 260 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 59,580,898 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 955,743 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 60,536,641 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 60,536,641 |  |  |
Accumulated Depreciation | (19,462,344) |  |  |
Investment in Real Estate, Net | 41,074,297 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Mountain View Redevelopment [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Mountain View, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 17,876 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 17,876 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 17,876 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 17,876 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Mozaic at Union Station [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 272 |  |  |
Initial Cost to Company, Land | $ 8,500,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 52,529,446 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,126,281 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 8,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 54,655,727 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 63,155,727 |  |  |
Accumulated Depreciation | (22,181,465) |  |  |
Investment in Real Estate, Net | 40,974,262 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Murray Hill Tower (fka Murray Hill) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 270 |  |  |
Initial Cost to Company, Land | $ 75,800,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 102,705,401 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 8,886,567 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 75,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 111,591,968 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 187,391,968 |  |  |
Accumulated Depreciation | (25,690,086) |  |  |
Investment in Real Estate, Net | 161,701,882 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
North Pier at Harborside [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Jersey City, NJ |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 297 |  |  |
Initial Cost to Company, Land | $ 4,000,159 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 94,290,590 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,047,215 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 4,000,159 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 98,337,805 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 102,337,964 |  |  |
Accumulated Depreciation | (46,111,052) |  |  |
Investment in Real Estate, Net | 56,226,912 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Northglen [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Valencia, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 234 |  |  |
Initial Cost to Company, Land | $ 9,360,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 20,778,553 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,506,094 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 9,360,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 25,284,647 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 34,644,647 |  |  |
Accumulated Depreciation | (14,197,899) |  |  |
Investment in Real Estate, Net | 20,446,748 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Northpark [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Burlingame, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 510 |  |  |
Initial Cost to Company, Land | $ 38,607,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 77,472,217 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 13,899,131 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 38,607,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 91,371,348 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 129,978,348 |  |  |
Accumulated Depreciation | (32,707,629) |  |  |
Investment in Real Estate, Net | 97,270,719 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Northridge [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Pleasant Hill, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 221 |  |  |
Initial Cost to Company, Land | $ 5,524,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 14,691,705 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 10,828,364 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,524,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 25,520,069 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 31,044,069 |  |  |
Accumulated Depreciation | (18,623,618) |  |  |
Investment in Real Estate, Net | 12,420,451 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Oak Park Combined [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Agoura Hills, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 444 |  |  |
Initial Cost to Company, Land | $ 3,390,700 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 30,517,274 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 10,331,701 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 3,390,700 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 40,848,975 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 44,239,675 |  |  |
Accumulated Depreciation | (30,282,737) |  |  |
Investment in Real Estate, Net | 13,956,938 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Oakwood Boston [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Boston, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 94 |  |  |
Initial Cost to Company, Land | $ 22,200,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 28,672,979 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,616,791 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 22,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 30,289,770 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 52,489,770 |  |  |
Accumulated Depreciation | (7,037,665) |  |  |
Investment in Real Estate, Net | 45,452,105 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Oakwood Crystal City [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 162 |  |  |
Initial Cost to Company, Land | $ 15,400,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 35,474,336 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,757,149 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 15,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 39,231,485 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 54,631,485 |  |  |
Accumulated Depreciation | (8,406,119) |  |  |
Investment in Real Estate, Net | 46,225,366 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Oakwood Marina Del Rey [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Marina Del Rey, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 597 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 120,795,359 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,723,823 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 123,519,182 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 123,519,182 |  |  |
Accumulated Depreciation | (29,036,612) |  |  |
Investment in Real Estate, Net | 94,482,570 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Oaks [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Santa Clarita, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 520 |  |  |
Initial Cost to Company, Land | $ 23,400,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 61,020,438 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,585,786 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 23,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 66,606,224 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 90,006,224 |  |  |
Accumulated Depreciation | (34,133,995) |  |  |
Investment in Real Estate, Net | 55,872,229 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Ocean Crest [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Solana Beach, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 146 |  |  |
Initial Cost to Company, Land | $ 5,111,200 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 11,910,438 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,250,627 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,111,200 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 16,161,065 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 21,272,265 |  |  |
Accumulated Depreciation | (10,492,882) |  |  |
Investment in Real Estate, Net | 10,779,383 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Odin (fka Tallman) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 301 |  |  |
Initial Cost to Company, Land | $ 16,807,519 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 63,645,480 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 9,233 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 16,807,519 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 63,654,713 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 80,462,232 |  |  |
Accumulated Depreciation | (5,819,185) |  |  |
Investment in Real Estate, Net | 74,643,047 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Old Town Lofts [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Redmond, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 149 |  |  |
Initial Cost to Company, Land | $ 7,740,467 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 44,146,181 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 784,750 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 7,740,467 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 44,930,931 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 52,671,398 |  |  |
Accumulated Depreciation | (5,125,092) |  |  |
Investment in Real Estate, Net | 47,546,306 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
One Henry Adams [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Francisco, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 241 |  |  |
Initial Cost to Company, Land | $ 30,224,393 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 137,031,168 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,724 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 30,224,393 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 137,037,892 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 167,262,285 |  |  |
Accumulated Depreciation | (5,417,321) |  |  |
Investment in Real Estate, Net | 161,844,964 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Pacific Place [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 430 |  |  |
Initial Cost to Company, Land | $ 32,250,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 110,750,000 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,483,644 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 32,250,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 112,233,644 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 144,483,644 |  |  |
Accumulated Depreciation | (23,253,190) |  |  |
Investment in Real Estate, Net | 121,230,454 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Packard Building [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 61 |  |  |
Initial Cost to Company, Land | $ 5,911,041 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 19,954,959 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 226,050 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,911,041 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 20,181,009 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 26,092,050 |  |  |
Accumulated Depreciation | (2,148,366) |  |  |
Investment in Real Estate, Net | 23,943,684 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Parc 77 [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 137 |  |  |
Initial Cost to Company, Land | $ 40,504,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 18,025,679 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,041,700 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 40,504,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 24,067,379 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 64,571,379 |  |  |
Accumulated Depreciation | (12,290,428) |  |  |
Investment in Real Estate, Net | 52,280,951 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Parc Cameron [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 166 |  |  |
Initial Cost to Company, Land | $ 37,600,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 9,855,597 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 7,300,028 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 37,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 17,155,625 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 54,755,625 |  |  |
Accumulated Depreciation | (10,340,621) |  |  |
Investment in Real Estate, Net | 44,415,004 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Parc Coliseum [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 177 |  |  |
Initial Cost to Company, Land | $ 52,654,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 23,045,751 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 8,978,751 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 52,654,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 32,024,502 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 84,678,502 |  |  |
Accumulated Depreciation | (16,948,295) |  |  |
Investment in Real Estate, Net | 67,730,207 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Parc East Towers [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 324 |  |  |
Initial Cost to Company, Land | $ 102,163,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 108,989,402 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 10,236,255 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 102,163,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 119,225,657 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 221,388,657 |  |  |
Accumulated Depreciation | (48,273,891) |  |  |
Investment in Real Estate, Net | 173,114,766 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Parc on Powell (fka Parkside at Emeryville) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Emeryville, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 173 |  |  |
Initial Cost to Company, Land | $ 16,667,059 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 65,071,885 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 224,676 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 16,667,059 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 65,296,561 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 81,963,620 |  |  |
Accumulated Depreciation | (6,675,129) |  |  |
Investment in Real Estate, Net | 75,288,491 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Park at Pentagon Row (fka Pentagon City) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 298 |  |  |
Initial Cost to Company, Land | $ 28,300,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 78,838,184 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,995,147 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 28,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 80,833,331 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 109,133,331 |  |  |
Accumulated Depreciation | (17,268,528) |  |  |
Investment in Real Estate, Net | 91,864,803 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Park Connecticut [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 142 |  |  |
Initial Cost to Company, Land | $ 13,700,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 59,087,519 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,447,815 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 13,700,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 60,535,334 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 74,235,334 |  |  |
Accumulated Depreciation | (12,311,907) |  |  |
Investment in Real Estate, Net | 61,923,427 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Park Hacienda (fka Hacienda) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Pleasanton, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 540 |  |  |
Initial Cost to Company, Land | $ 43,200,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 128,753,359 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,520,251 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 43,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 131,273,610 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 174,473,610 |  |  |
Accumulated Depreciation | (29,930,085) |  |  |
Investment in Real Estate, Net | 144,543,525 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Park West (CA) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 444 |  |  |
Initial Cost to Company, Land | $ 3,033,500 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 27,302,383 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 10,420,073 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 3,033,500 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,722,456 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 40,755,956 |  |  |
Accumulated Depreciation | (27,786,714) |  |  |
Investment in Real Estate, Net | 12,969,242 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Parkside [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Union City, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 208 |  |  |
Initial Cost to Company, Land | $ 6,246,700 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 11,827,453 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,452,846 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 6,246,700 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 17,280,299 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 23,526,999 |  |  |
Accumulated Depreciation | (11,589,006) |  |  |
Investment in Real Estate, Net | 11,937,993 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Pearl, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 80 |  |  |
Initial Cost to Company, Land | $ 6,972,585 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 26,527,415 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 556,995 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 6,972,585 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 27,084,410 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 34,056,995 |  |  |
Accumulated Depreciation | (2,841,186) |  |  |
Investment in Real Estate, Net | 31,215,809 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Pegasus [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 322 |  |  |
Initial Cost to Company, Land | $ 18,094,052 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 81,905,948 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,943,360 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 18,094,052 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 86,849,308 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 104,943,360 |  |  |
Accumulated Depreciation | (26,155,411) |  |  |
Investment in Real Estate, Net | 78,787,949 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Playa Pacifica [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Hermosa Beach, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 285 |  |  |
Initial Cost to Company, Land | $ 35,100,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 33,473,822 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 22,912,647 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 35,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 56,386,469 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 91,486,469 |  |  |
Accumulated Depreciation | (25,547,975) |  |  |
Investment in Real Estate, Net | 65,938,494 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Portofino [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Chino Hills, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 176 |  |  |
Initial Cost to Company, Land | $ 3,572,400 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 14,660,994 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,713,205 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 3,572,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,374,199 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 21,946,599 |  |  |
Accumulated Depreciation | (12,779,600) |  |  |
Investment in Real Estate, Net | 9,166,999 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Portofino (Val) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Valencia, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 216 |  |  |
Initial Cost to Company, Land | $ 8,640,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 21,487,126 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,380,999 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 8,640,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,868,125 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,508,125 |  |  |
Accumulated Depreciation | (15,359,183) |  |  |
Investment in Real Estate, Net | 20,148,942 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Portside Towers [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Jersey City, NJ |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 527 |  |  |
Initial Cost to Company, Land | $ 22,487,006 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 96,842,913 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 21,767,146 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 22,487,006 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 118,610,059 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 141,097,065 |  |  |
Accumulated Depreciation | (80,249,602) |  |  |
Investment in Real Estate, Net | 60,847,463 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Potrero 1010 [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Francisco, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 453 |  |  |
Initial Cost to Company, Land | $ 40,830,011 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 178,932,843 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 16,775 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 40,830,011 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 178,949,618 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 219,779,629 |  |  |
Accumulated Depreciation | (11,563,892) |  |  |
Investment in Real Estate, Net | 208,215,737 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Prado (fka Glendale) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Glendale, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 264 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 67,977,313 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,211,660 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 71,188,973 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 71,188,973 |  |  |
Accumulated Depreciation | (15,429,230) |  |  |
Investment in Real Estate, Net | 55,759,743 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Prime, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 256 |  |  |
Initial Cost to Company, Land | $ 32,000,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 64,436,539 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,417,186 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 32,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 65,853,725 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 97,853,725 |  |  |
Accumulated Depreciation | (27,697,067) |  |  |
Investment in Real Estate, Net | 70,156,658 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Prism at Park Avenue South (fka 400 Park Aveue South (EQR)) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 269 |  |  |
Initial Cost to Company, Land | $ 76,292,169 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 172,553,723 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 90,272 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 76,292,169 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 172,643,995 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 248,936,164 |  |  |
Accumulated Depreciation | (18,802,832) |  |  |
Investment in Real Estate, Net | 230,133,332 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Promenade at Town Center I & II [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Valencia, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 564 |  |  |
Initial Cost to Company, Land | $ 28,200,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 69,795,915 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 8,077,724 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 28,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 77,873,639 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 106,073,639 |  |  |
Accumulated Depreciation | (38,490,478) |  |  |
Investment in Real Estate, Net | 67,583,161 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Quarry Hills [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Quincy, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 316 |  |  |
Initial Cost to Company, Land | $ 26,900,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 84,411,162 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,089,632 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 26,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 86,500,794 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 113,400,794 |  |  |
Accumulated Depreciation | (19,076,341) |  |  |
Investment in Real Estate, Net | 94,324,453 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Providence [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Bothell, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 200 |  |  |
Initial Cost to Company, Land | $ 3,573,621 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 19,055,505 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,051,612 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 3,573,621 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 21,107,117 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 24,680,738 |  |  |
Accumulated Depreciation | (10,234,226) |  |  |
Investment in Real Estate, Net | 14,446,512 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Red 160 (fka Redmond Way) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Redmond, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 250 |  |  |
Initial Cost to Company, Land | $ 15,546,376 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 65,320,010 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,166,488 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 15,546,376 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 66,486,498 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 82,032,874 |  |  |
Accumulated Depreciation | (16,019,260) |  |  |
Investment in Real Estate, Net | 66,013,614 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Redmond Court [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Bellevue, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 206 |  |  |
Initial Cost to Company, Land | $ 10,300,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 33,488,745 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 900,433 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 10,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 34,389,178 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 44,689,178 |  |  |
Accumulated Depreciation | (8,390,947) |  |  |
Investment in Real Estate, Net | 36,298,231 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Radius Koreatown [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 301 |  |  |
Initial Cost to Company, Land | $ 32,494,154 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 84,645,202 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 22,940 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 32,494,154 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 84,668,142 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 117,162,296 |  |  |
Accumulated Depreciation | (2,949,192) |  |  |
Investment in Real Estate, Net | 114,213,104 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Regency Palms [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Huntington Beach, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 310 |  |  |
Initial Cost to Company, Land | $ 1,857,400 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 16,713,254 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,014,242 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 1,857,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,727,496 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 24,584,896 |  |  |
Accumulated Depreciation | (17,510,000) |  |  |
Investment in Real Estate, Net | 7,074,896 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Renaissance Villas [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Berkeley, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 34 |  |  |
Initial Cost to Company, Land | $ 2,458,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 4,542,000 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 184,192 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 2,458,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 4,726,192 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 7,184,192 |  |  |
Accumulated Depreciation | (1,859,882) |  |  |
Investment in Real Estate, Net | 5,324,310 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Reserve at Mountain View (fka Mountain View) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Mountain View, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 180 |  |  |
Initial Cost to Company, Land | $ 27,000,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 33,029,605 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,606,368 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 27,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 39,635,973 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 66,635,973 |  |  |
Accumulated Depreciation | (8,901,550) |  |  |
Investment in Real Estate, Net | 57,734,423 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Reserve at Potomac Yard [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Alexandria, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 588 |  |  |
Initial Cost to Company, Land | $ 11,918,917 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 68,862,641 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 13,703,091 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 11,918,917 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 82,565,732 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 94,484,649 |  |  |
Accumulated Depreciation | (38,310,647) |  |  |
Investment in Real Estate, Net | 56,174,002 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Reserve at Town Center I-III (WA) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Mill Creek, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 584 |  |  |
Initial Cost to Company, Land | $ 16,768,705 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 77,511,523 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,631,274 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 16,768,705 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 81,142,797 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 97,911,502 |  |  |
Accumulated Depreciation | (30,389,852) |  |  |
Investment in Real Estate, Net | 67,521,650 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Reserve at Empire Lakes [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Rancho Cucamonga, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 467 |  |  |
Initial Cost to Company, Land | $ 16,345,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 73,080,670 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,031,630 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 16,345,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 76,112,300 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 92,457,300 |  |  |
Accumulated Depreciation | (33,721,496) |  |  |
Investment in Real Estate, Net | 58,735,804 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Residences at Westgate I (fka Westage II) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Pasadena, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 252 |  |  |
Initial Cost to Company, Land | $ 17,859,785 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 109,033,369 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 244,721 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 17,859,785 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 109,278,090 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 127,137,875 |  |  |
Accumulated Depreciation | (16,997,966) |  |  |
Investment in Real Estate, Net | 110,139,909 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Residences at Westgate II (fka Westgage III) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Pasadena, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 88 |  |  |
Initial Cost to Company, Land | $ 12,118,248 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 40,420,828 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 50,108 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 12,118,248 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 40,470,936 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 52,589,184 |  |  |
Accumulated Depreciation | (4,259,073) |  |  |
Investment in Real Estate, Net | 48,330,111 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Rianna I [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 78 |  |  |
Initial Cost to Company, Land | $ 2,268,160 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 14,864,482 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 594,152 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 2,268,160 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 15,458,634 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 17,726,794 |  |  |
Accumulated Depreciation | (5,412,019) |  |  |
Investment in Real Estate, Net | 12,314,775 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Ridgewood Village I&II [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Diego, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 408 |  |  |
Initial Cost to Company, Land | $ 11,809,500 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 34,004,048 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,628,651 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 11,809,500 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 39,632,699 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 51,442,199 |  |  |
Accumulated Depreciation | (24,659,415) |  |  |
Investment in Real Estate, Net | 26,782,784 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Riva Terra I (fka Redwood Shores) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Redwood City, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 304 |  |  |
Initial Cost to Company, Land | $ 34,963,355 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 84,587,658 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,238,246 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 34,963,355 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 87,825,904 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 122,789,259 |  |  |
Accumulated Depreciation | (20,223,427) |  |  |
Investment in Real Estate, Net | 102,565,832 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Riva Terra II (fka Harborside) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Redwood City, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 149 |  |  |
Initial Cost to Company, Land | $ 17,136,645 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 40,536,531 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,064,253 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 17,136,645 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 42,600,784 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 59,737,429 |  |  |
Accumulated Depreciation | (9,084,137) |  |  |
Investment in Real Estate, Net | 50,653,292 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Riverpark [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Redmond, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 321 |  |  |
Initial Cost to Company, Land | $ 14,355,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 80,894,049 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,514,535 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 14,355,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 84,408,584 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 98,763,584 |  |  |
Accumulated Depreciation | (21,590,814) |  |  |
Investment in Real Estate, Net | 77,172,770 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Rianna II [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 78 |  |  |
Initial Cost to Company, Land | $ 2,161,840 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 14,433,614 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 387,624 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 2,161,840 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 14,821,238 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 16,983,078 |  |  |
Accumulated Depreciation | (5,134,291) |  |  |
Investment in Real Estate, Net | 11,848,787 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Rosecliff II [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Quincy, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 130 |  |  |
Initial Cost to Company, Land | $ 4,922,840 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 30,202,160 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,107,943 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 4,922,840 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,310,103 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 36,232,943 |  |  |
Accumulated Depreciation | (9,015,949) |  |  |
Investment in Real Estate, Net | 27,216,994 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Sakura Crossing [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 230 |  |  |
Initial Cost to Company, Land | $ 14,641,990 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 42,858,010 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 945,394 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 14,641,990 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 43,803,404 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 58,445,394 |  |  |
Accumulated Depreciation | (13,215,641) |  |  |
Investment in Real Estate, Net | 45,229,753 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Seventh & James [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 96 |  |  |
Initial Cost to Company, Land | $ 663,800 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 5,974,803 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,891,414 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 663,800 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 9,866,217 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 10,530,017 |  |  |
Accumulated Depreciation | (7,394,440) |  |  |
Investment in Real Estate, Net | 3,135,577 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Sheffield Court [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 597 |  |  |
Initial Cost to Company, Land | $ 3,342,381 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 31,337,332 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 14,580,051 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 3,342,381 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,917,383 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 49,259,764 |  |  |
Accumulated Depreciation | (35,827,987) |  |  |
Investment in Real Estate, Net | 13,431,777 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Skycrest [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Valencia, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 264 |  |  |
Initial Cost to Company, Land | $ 10,560,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 25,574,457 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,456,198 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 10,560,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 30,030,655 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 40,590,655 |  |  |
Accumulated Depreciation | (17,139,075) |  |  |
Investment in Real Estate, Net | 23,451,580 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Skylark [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Union City, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 174 |  |  |
Initial Cost to Company, Land | $ 1,781,600 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 16,731,916 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,392,507 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 1,781,600 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,124,423 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 23,906,023 |  |  |
Accumulated Depreciation | (13,428,913) |  |  |
Investment in Real Estate, Net | 10,477,110 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Skyline Terrace [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Burlingame, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 138 |  |  |
Initial Cost to Company, Land | $ 16,836,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 35,414,000 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,163,764 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 16,836,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 40,577,764 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 57,413,764 |  |  |
Accumulated Depreciation | (13,281,197) |  |  |
Investment in Real Estate, Net | 44,132,567 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Skyline Towers [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Falls Church, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 939 |  |  |
Initial Cost to Company, Land | $ 78,278,200 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 91,485,591 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 43,209,046 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 78,278,200 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 134,694,637 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 212,972,837 |  |  |
Accumulated Depreciation | (72,629,553) |  |  |
Investment in Real Estate, Net | 140,343,284 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
SoMa II [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Francisco, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 29,406,606 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 5,393,139 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 29,406,606 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 5,393,139 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 34,799,745 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 34,799,745 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Sonterra at Foothill Ranch [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Foothill Ranch, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 300 |  |  |
Initial Cost to Company, Land | $ 7,503,400 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 24,048,507 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,811,134 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 7,503,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 29,859,641 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 37,363,041 |  |  |
Accumulated Depreciation | (18,657,410) |  |  |
Investment in Real Estate, Net | 18,705,631 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
South City Station (fka South San Francisco) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Francisco, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 360 |  |  |
Initial Cost to Company, Land | $ 68,900,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 79,476,861 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,784,286 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 68,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 82,261,147 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 151,161,147 |  |  |
Accumulated Depreciation | (18,547,168) |  |  |
Investment in Real Estate, Net | 132,613,979 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Southwood [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Palo Alto, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 100 |  |  |
Initial Cost to Company, Land | $ 6,936,600 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 14,324,069 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,215,343 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 6,936,600 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,539,412 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 25,476,012 |  |  |
Accumulated Depreciation | (12,007,752) |  |  |
Investment in Real Estate, Net | 13,468,260 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Springbrook Estates [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Riverside, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 18,200,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 0 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 18,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 18,200,000 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 18,200,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Summerset Village II [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Chatsworth, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 260,646 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 0 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 260,646 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 260,646 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 260,646 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Summit at Sausalito (fka Sausalito) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Sausalito, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 198 |  |  |
Initial Cost to Company, Land | $ 26,000,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 28,435,024 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,286,153 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 26,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 34,721,177 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 60,721,177 |  |  |
Accumulated Depreciation | (9,412,796) |  |  |
Investment in Real Estate, Net | 51,308,381 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Springline [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 136 |  |  |
Initial Cost to Company, Land | $ 9,163,666 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 47,910,981 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 149,570 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 9,163,666 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 48,060,551 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 57,224,217 |  |  |
Accumulated Depreciation | (2,733,027) |  |  |
Investment in Real Estate, Net | 54,491,190 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Ten23 (fka 500 West 23rd Street) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 111 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 58,881,873 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 200,907 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 59,082,780 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 59,082,780 |  |  |
Accumulated Depreciation | (12,278,031) |  |  |
Investment in Real Estate, Net | 46,804,749 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Town Square at Mark Center II [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Alexandria, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 272 |  |  |
Initial Cost to Company, Land | $ 15,568,464 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 55,029,607 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,744,364 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 15,568,464 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 58,773,971 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 74,342,435 |  |  |
Accumulated Depreciation | (19,047,027) |  |  |
Investment in Real Estate, Net | 55,295,408 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Terraces, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Francisco, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 117 |  |  |
Initial Cost to Company, Land | $ 14,087,610 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 16,314,151 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,262,327 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 14,087,610 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 17,576,478 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 31,664,088 |  |  |
Accumulated Depreciation | (5,789,387) |  |  |
Investment in Real Estate, Net | 25,874,701 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Urbana (fka Market Street Landing) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 287 |  |  |
Initial Cost to Company, Land | $ 12,542,418 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 75,766,505 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 346,564 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 12,542,418 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 76,113,069 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 88,655,487 |  |  |
Accumulated Depreciation | (14,010,017) |  |  |
Investment in Real Estate, Net | 74,645,470 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Third Square [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Cambridge, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 471 |  |  |
Initial Cost to Company, Land | $ 26,767,171 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 218,822,728 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,733,059 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 26,767,171 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 225,555,787 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 252,322,958 |  |  |
Accumulated Depreciation | (70,108,714) |  |  |
Investment in Real Estate, Net | 182,214,244 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Uwajimaya Village [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 176 |  |  |
Initial Cost to Company, Land | $ 8,800,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 22,188,288 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,728,090 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 8,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 23,916,378 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 32,716,378 |  |  |
Accumulated Depreciation | (10,901,158) |  |  |
Investment in Real Estate, Net | 21,815,220 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Three20 [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 134 |  |  |
Initial Cost to Company, Land | $ 7,030,766 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 29,005,762 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 729,045 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 7,030,766 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 29,734,807 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 36,765,573 |  |  |
Accumulated Depreciation | (5,577,508) |  |  |
Investment in Real Estate, Net | 31,188,065 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Vantage Pointe [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Diego, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 679 |  |  |
Initial Cost to Company, Land | $ 9,403,960 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 190,596,040 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 9,156,867 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 9,403,960 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 199,752,907 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 209,156,867 |  |  |
Accumulated Depreciation | (59,435,552) |  |  |
Investment in Real Estate, Net | 149,721,315 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Town Center South Commercial [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | St. Charles, MD |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 1,500,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 9,394 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 1,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 9,394 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 1,509,394 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 1,509,394 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Veloce [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Redmond, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 322 |  |  |
Initial Cost to Company, Land | $ 15,322,724 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 76,176,594 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,246,516 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 15,322,724 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 77,423,110 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 92,745,834 |  |  |
Accumulated Depreciation | (17,729,126) |  |  |
Investment in Real Estate, Net | 75,016,708 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Verde Condominium Homes (fka Mission Verde, LLC) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Jose, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 108 |  |  |
Initial Cost to Company, Land | $ 5,190,700 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 9,679,109 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,309,244 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,190,700 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 13,988,353 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 19,179,053 |  |  |
Accumulated Depreciation | (9,877,543) |  |  |
Investment in Real Estate, Net | 9,301,510 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Veridian (fka Silver Spring) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Silver Spring, MD |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 457 |  |  |
Initial Cost to Company, Land | $ 18,539,817 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 130,407,365 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,078,639 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 18,539,817 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 133,486,004 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 152,025,821 |  |  |
Accumulated Depreciation | (39,137,932) |  |  |
Investment in Real Estate, Net | 112,887,889 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Villa Solana [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Laguna Hills, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 272 |  |  |
Initial Cost to Company, Land | $ 1,665,100 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 14,985,678 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 9,752,842 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 1,665,100 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 24,738,520 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 26,403,620 |  |  |
Accumulated Depreciation | (19,582,595) |  |  |
Investment in Real Estate, Net | 6,821,025 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Village at Del Mar Heights, The (fka Del Mar Heights) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Diego, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 168 |  |  |
Initial Cost to Company, Land | $ 15,100,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 40,859,396 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,315,901 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 15,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 42,175,297 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 57,275,297 |  |  |
Accumulated Depreciation | (9,628,990) |  |  |
Investment in Real Estate, Net | 47,646,307 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Virginia Square [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 231 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 85,940,003 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,594,826 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 90,534,829 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 90,534,829 |  |  |
Accumulated Depreciation | (18,797,549) |  |  |
Investment in Real Estate, Net | 71,737,280 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Venn at Main [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Bellevue, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 350 |  |  |
Initial Cost to Company, Land | $ 26,626,498 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 151,653,323 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 139,573 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 26,626,498 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 151,792,896 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 178,419,394 |  |  |
Accumulated Depreciation | (3,058,972) |  |  |
Investment in Real Estate, Net | 175,360,422 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Vista 99 (fka Tasman) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Jose, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 554 |  |  |
Initial Cost to Company, Land | $ 27,709,329 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 176,023,094 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 113,479 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 27,709,329 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 176,136,573 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 203,845,902 |  |  |
Accumulated Depreciation | (12,631,445) |  |  |
Investment in Real Estate, Net | 191,214,457 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Vista Del Lago [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Mission Viejo, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 608 |  |  |
Initial Cost to Company, Land | $ 4,525,800 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 40,736,293 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 16,741,744 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 4,525,800 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 57,478,037 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 62,003,837 |  |  |
Accumulated Depreciation | (46,045,156) |  |  |
Investment in Real Estate, Net | 15,958,681 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Vista on Courthouse [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 220 |  |  |
Initial Cost to Company, Land | $ 15,550,260 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 69,449,740 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,823,317 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 15,550,260 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 71,273,057 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 86,823,317 |  |  |
Accumulated Depreciation | (23,435,882) |  |  |
Investment in Real Estate, Net | 63,387,435 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Walden Park [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Cambridge, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 232 |  |  |
Initial Cost to Company, Land | $ 12,448,888 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 52,044,448 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,293,327 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 12,448,888 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 56,337,775 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 68,786,663 |  |  |
Accumulated Depreciation | (17,603,707) |  |  |
Investment in Real Estate, Net | 51,182,956 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Water Park Towers [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 362 |  |  |
Initial Cost to Company, Land | $ 34,400,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 108,485,859 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 9,546,702 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 34,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 118,032,561 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 152,432,561 |  |  |
Accumulated Depreciation | (25,460,371) |  |  |
Investment in Real Estate, Net | 126,972,190 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Vintage [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Ontario, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 300 |  |  |
Initial Cost to Company, Land | $ 7,059,230 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 47,677,762 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,233,489 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 7,059,230 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 48,911,251 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 55,970,481 |  |  |
Accumulated Depreciation | (20,304,558) |  |  |
Investment in Real Estate, Net | 35,665,923 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Watertown Square [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Watertown, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 134 |  |  |
Initial Cost to Company, Land | $ 16,800,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 34,074,056 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,348,261 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 16,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 35,422,317 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 52,222,317 |  |  |
Accumulated Depreciation | (7,618,267) |  |  |
Investment in Real Estate, Net | 44,604,050 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
West 96th [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 207 |  |  |
Initial Cost to Company, Land | $ 84,800,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 67,055,502 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,265,243 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 84,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 72,320,745 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 157,120,745 |  |  |
Accumulated Depreciation | (17,919,572) |  |  |
Investment in Real Estate, Net | 139,201,173 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
West End Apartments (fka Emerson Place/ CRP II) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Boston, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 310 |  |  |
Initial Cost to Company, Land | $ 469,546 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 163,123,022 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,821,262 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 469,546 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 165,944,284 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 166,413,830 |  |  |
Accumulated Depreciation | (55,691,880) |  |  |
Investment in Real Estate, Net | 110,721,950 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Westchester at Rockville [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Rockville, MD |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 192 |  |  |
Initial Cost to Company, Land | $ 10,600,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 44,135,207 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 703,338 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 10,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 44,838,545 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 55,438,545 |  |  |
Accumulated Depreciation | (9,691,644) |  |  |
Investment in Real Estate, Net | 45,746,901 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Westmont [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 163 |  |  |
Initial Cost to Company, Land | $ 64,900,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 61,143,259 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,724,370 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 64,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 63,867,629 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 128,767,629 |  |  |
Accumulated Depreciation | (14,415,326) |  |  |
Investment in Real Estate, Net | 114,352,303 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Westside [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 204 |  |  |
Initial Cost to Company, Land | $ 34,200,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 56,962,630 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,861,832 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 34,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 59,824,462 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 94,024,462 |  |  |
Accumulated Depreciation | (12,610,533) |  |  |
Investment in Real Estate, Net | 81,413,929 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Westside Barrington (fka Westside Villas III) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 36 |  |  |
Initial Cost to Company, Land | $ 3,060,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 5,538,871 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 920,282 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 3,060,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 6,459,153 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 9,519,153 |  |  |
Accumulated Depreciation | (3,618,136) |  |  |
Investment in Real Estate, Net | 5,901,017 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Westside Barry (fka Westside Villas VI) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 18 |  |  |
Initial Cost to Company, Land | $ 1,530,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 3,023,523 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 599,854 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 1,530,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 3,623,377 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 5,153,377 |  |  |
Accumulated Depreciation | (2,053,667) |  |  |
Investment in Real Estate, Net | 3,099,710 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Westside Beloit (fka Westside Villas I) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 21 |  |  |
Initial Cost to Company, Land | $ 1,785,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 3,233,254 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 628,089 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 1,785,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 3,861,343 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 5,646,343 |  |  |
Accumulated Depreciation | (2,239,628) |  |  |
Investment in Real Estate, Net | 3,406,715 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Westside Bundy (fka Westside Villas II) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 23 |  |  |
Initial Cost to Company, Land | $ 1,955,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 3,541,435 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 642,479 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 1,955,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 4,183,914 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 6,138,914 |  |  |
Accumulated Depreciation | (2,324,838) |  |  |
Investment in Real Estate, Net | 3,814,076 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Westside Butler (fka Westside Villas IV) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 36 |  |  |
Initial Cost to Company, Land | $ 3,060,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 5,539,390 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 949,817 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 3,060,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 6,489,207 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 9,549,207 |  |  |
Accumulated Depreciation | (3,619,180) |  |  |
Investment in Real Estate, Net | 5,930,027 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Westside Villas (fka Westside Villas V & VII) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 113 |  |  |
Initial Cost to Company, Land | $ 9,605,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 19,983,385 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,493,267 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 9,605,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,476,652 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 32,081,652 |  |  |
Accumulated Depreciation | (12,289,331) |  |  |
Investment in Real Estate, Net | 19,792,321 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Windridge (CA) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Laguna Niguel, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 344 |  |  |
Initial Cost to Company, Land | $ 2,662,900 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 23,985,497 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 10,800,566 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 2,662,900 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 34,786,063 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 37,448,963 |  |  |
Accumulated Depreciation | (25,964,327) |  |  |
Investment in Real Estate, Net | 11,484,636 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Wood Creek I [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Pleasant Hill, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 256 |  |  |
Initial Cost to Company, Land | $ 9,729,900 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 23,009,768 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 8,661,346 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 9,729,900 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,671,114 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 41,401,014 |  |  |
Accumulated Depreciation | (21,717,920) |  |  |
Investment in Real Estate, Net | 19,683,094 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Management Business [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Chicago, IL |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 0 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 112,328,951 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 112,328,951 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 112,328,951 |  |  |
Accumulated Depreciation | (92,675,414) |  |  |
Investment in Real Estate, Net | 19,653,537 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Operating Partnership [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Chicago, IL |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 9,047,067 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 9,047,067 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 9,047,067 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 9,047,067 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Other |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | N/A |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 0 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 0 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 70,353 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 70,353 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 70,353 |  |  |
Accumulated Depreciation | (15,311) |  |  |
Investment in Real Estate, Net | 55,042 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Investment in Real Estate - Wholly Owned Unencumbered [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 55,954 |  |  |
Initial Cost to Company, Land | $ 4,618,857,608 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 14,026,732,412 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,131,147,795 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 4,618,857,608 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 15,157,880,207 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 19,776,737,815 |  |  |
Accumulated Depreciation | (4,363,244,353) |  |  |
Investment in Real Estate, Net | 15,413,493,462 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
101 West End [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 506 |  |  |
Initial Cost to Company, Land | $ 190,600,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 131,374,708 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,465,890 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 190,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 135,840,598 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 326,440,598 |  |  |
Accumulated Depreciation | (33,939,026) |  |  |
Investment in Real Estate, Net | 292,501,572 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 103,730,409 |  |  |
Joyce On Pentagon Row 1401 [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 326 |  |  |
Initial Cost to Company, Land | $ 9,780,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 89,668,165 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,811,215 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 9,780,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 94,479,380 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 104,259,380 |  |  |
Accumulated Depreciation | (31,540,500) |  |  |
Investment in Real Estate, Net | 72,718,880 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 57,354,529 |  |  |
2501 Porter [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 202 |  |  |
Initial Cost to Company, Land | $ 13,000,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 75,271,179 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,572,192 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 13,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 79,843,371 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 92,843,371 |  |  |
Accumulated Depreciation | (16,734,740) |  |  |
Investment in Real Estate, Net | $ 76,108,631 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
300 East 39th [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 254 |  |  |
Initial Cost to Company, Land | $ 48,900,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 96,174,639 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,532,467 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 48,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 99,707,106 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 148,607,106 |  |  |
Accumulated Depreciation | (21,799,732) |  |  |
Investment in Real Estate, Net | 126,807,374 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 60,451,283 |  |  |
303 East 83rd (fka Camargue) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 261 |  |  |
Initial Cost to Company, Land | $ 79,400,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 79,122,624 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,673,574 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 79,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 82,796,198 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 162,196,198 |  |  |
Accumulated Depreciation | (18,995,345) |  |  |
Investment in Real Estate, Net | $ 143,200,853 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
425 Broadway [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Santa Monica, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 101 |  |  |
Initial Cost to Company, Land | $ 12,600,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 34,394,772 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,577,985 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 12,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,972,757 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 50,572,757 |  |  |
Accumulated Depreciation | (8,081,082) |  |  |
Investment in Real Estate, Net | $ 42,491,675 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
55 West Fifth I & II (fka Townhouse Plaza and Gardens)s [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Mateo, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 241 |  |  |
Initial Cost to Company, Land | $ 21,041,710 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 71,931,323 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 12,415,912 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 21,041,710 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 84,347,235 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 105,388,945 |  |  |
Accumulated Depreciation | (21,523,119) |  |  |
Investment in Real Estate, Net | 83,865,826 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 26,356,053 |  |  |
800 Sixth Ave (fka Chelsea) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 266 |  |  |
Initial Cost to Company, Land | $ 59,900,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 155,861,605 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,180,446 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 59,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 158,042,051 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 217,942,051 |  |  |
Accumulated Depreciation | (32,855,478) |  |  |
Investment in Real Estate, Net | 185,086,573 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 77,654,125 |  |  |
Alcyone [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 162 |  |  |
Initial Cost to Company, Land | $ 11,379,497 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 49,360,503 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 973,758 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 11,379,497 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 50,334,261 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 61,713,758 |  |  |
Accumulated Depreciation | (7,663,311) |  |  |
Investment in Real Estate, Net | 54,050,447 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 28,247,417 |  |  |
929 Mass (fka 929 House) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Cambridge, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 127 |  |  |
Initial Cost to Company, Land | $ 3,252,993 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 21,745,595 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,801,241 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 3,252,993 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 28,546,836 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 31,799,829 |  |  |
Accumulated Depreciation | (17,379,493) |  |  |
Investment in Real Estate, Net | 14,420,336 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 578,381 |  |  |
Arches, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Sunnyvale, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 410 |  |  |
Initial Cost to Company, Land | $ 26,650,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 62,850,000 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,807,099 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 26,650,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 64,657,099 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 91,307,099 |  |  |
Accumulated Depreciation | (20,704,043) |  |  |
Investment in Real Estate, Net | $ 70,603,056 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (I) |  |  |
Academy Village [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | North Hollywood, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 248 |  |  |
Initial Cost to Company, Land | $ 25,000,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 23,593,194 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 8,511,551 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 25,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 32,104,745 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 57,104,745 |  |  |
Accumulated Depreciation | (18,102,739) |  |  |
Investment in Real Estate, Net | 39,002,006 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 19,965,907 |  |  |
Artisan Square [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Northridge, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 140 |  |  |
Initial Cost to Company, Land | $ 7,000,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 20,537,359 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,462,204 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 7,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 21,999,563 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 28,999,563 |  |  |
Accumulated Depreciation | (11,523,867) |  |  |
Investment in Real Estate, Net | 17,475,696 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 22,757,833 |  |  |
Avanti [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Anaheim, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 162 |  |  |
Initial Cost to Company, Land | $ 12,960,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 18,497,682 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,682,239 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 12,960,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,179,921 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,139,921 |  |  |
Accumulated Depreciation | (9,463,903) |  |  |
Investment in Real Estate, Net | 25,676,018 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 25,012,978 |  |  |
Avenir [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Boston, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 241 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 114,321,618 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,981,881 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 116,303,499 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 116,303,499 |  |  |
Accumulated Depreciation | (24,093,714) |  |  |
Investment in Real Estate, Net | 92,209,785 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 88,921,043 |  |  |
Bella Vista Apartments at Boca Del Mar [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Woodland Hills, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 579 |  |  |
Initial Cost to Company, Land | $ 31,682,754 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 121,095,786 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,014,382 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 31,682,754 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 127,110,168 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 158,792,922 |  |  |
Accumulated Depreciation | (53,777,824) |  |  |
Investment in Real Estate, Net | 105,015,098 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 57,907,496 |  |  |
Berkeleyan [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Berkeley, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 56 |  |  |
Initial Cost to Company, Land | $ 4,377,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 16,022,110 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 382,895 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 4,377,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 16,405,005 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 20,782,005 |  |  |
Accumulated Depreciation | (6,678,279) |  |  |
Investment in Real Estate, Net | 14,103,726 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 8,194,316 |  |  |
Calvert Woodley [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 136 |  |  |
Initial Cost to Company, Land | $ 12,600,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 43,527,379 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,058,223 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 12,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,585,602 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 58,185,602 |  |  |
Accumulated Depreciation | (10,036,657) |  |  |
Investment in Real Estate, Net | $ 48,148,945 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
Carmel Terrace [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Diego, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 384 |  |  |
Initial Cost to Company, Land | $ 2,288,300 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 20,596,281 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 11,891,883 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 2,288,300 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 32,488,164 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 34,776,464 |  |  |
Accumulated Depreciation | (26,616,700) |  |  |
Investment in Real Estate, Net | $ 8,159,764 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (I) |  |  |
Chelsea Square [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Redmond, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 113 |  |  |
Initial Cost to Company, Land | $ 3,397,100 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 9,289,074 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,525,829 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 3,397,100 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 11,814,903 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 15,212,003 |  |  |
Accumulated Depreciation | (7,732,982) |  |  |
Investment in Real Estate, Net | 7,479,021 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 9,219,668 |  |  |
Citrus Suites [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Santa Monica, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 70 |  |  |
Initial Cost to Company, Land | $ 9,000,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 16,950,326 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,886,846 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 9,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,837,172 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 27,837,172 |  |  |
Accumulated Depreciation | (4,064,530) |  |  |
Investment in Real Estate, Net | $ 23,772,642 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
Cleveland House [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 214 |  |  |
Initial Cost to Company, Land | $ 18,300,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 66,392,414 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,953,014 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 18,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 70,345,428 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 88,645,428 |  |  |
Accumulated Depreciation | (15,198,718) |  |  |
Investment in Real Estate, Net | $ 73,446,710 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
Columbia Crossing [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 247 |  |  |
Initial Cost to Company, Land | $ 23,500,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 53,045,073 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,637,583 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 23,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 55,682,656 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 79,182,656 |  |  |
Accumulated Depreciation | (12,776,595) |  |  |
Investment in Real Estate, Net | $ 66,406,061 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
Deerwood (SD) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Diego, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 316 |  |  |
Initial Cost to Company, Land | $ 2,082,095 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 18,739,815 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 14,811,438 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 2,082,095 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 33,551,253 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,633,348 |  |  |
Accumulated Depreciation | (28,255,938) |  |  |
Investment in Real Estate, Net | $ 7,377,410 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (I) |  |  |
DelMarRidge [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Diego, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 181 |  |  |
Initial Cost to Company, Land | $ 7,801,824 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 36,948,176 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,819,678 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 7,801,824 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 40,767,854 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 48,569,678 |  |  |
Accumulated Depreciation | (14,687,909) |  |  |
Investment in Real Estate, Net | 33,881,769 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 39,502,426 |  |  |
Estancia at Santa Clara (fka Santa Clara) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Santa Clara, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 450 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 123,759,804 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,306,632 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 125,066,436 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 125,066,436 |  |  |
Accumulated Depreciation | (27,568,376) |  |  |
Investment in Real Estate, Net | $ 97,498,060 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
Fairchase [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Fairfax, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 392 |  |  |
Initial Cost to Company, Land | $ 23,500,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 87,722,321 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 956,574 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 23,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 88,678,895 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 112,178,895 |  |  |
Accumulated Depreciation | (18,576,327) |  |  |
Investment in Real Estate, Net | $ 93,602,568 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
Fairfield [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Stamford, CT |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 263 |  |  |
Initial Cost to Company, Land | $ 6,510,200 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 39,690,120 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 7,711,222 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 6,510,200 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 47,401,342 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 53,911,542 |  |  |
Accumulated Depreciation | (32,614,560) |  |  |
Investment in Real Estate, Net | 21,296,982 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 31,314,687 |  |  |
Fine Arts Building [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Berkeley, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 100 |  |  |
Initial Cost to Company, Land | $ 7,817,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 26,462,772 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 379,630 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 7,817,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,842,402 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 34,659,402 |  |  |
Accumulated Depreciation | (10,821,726) |  |  |
Investment in Real Estate, Net | 23,837,676 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 15,964,066 |  |  |
Flats at DuPont Circle [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 306 |  |  |
Initial Cost to Company, Land | $ 35,200,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 108,768,198 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,152,022 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 35,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 109,920,220 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 145,120,220 |  |  |
Accumulated Depreciation | (22,256,517) |  |  |
Investment in Real Estate, Net | $ 122,863,703 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
Gaia Building [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Berkeley, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 91 |  |  |
Initial Cost to Company, Land | $ 7,113,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 25,623,826 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 317,100 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 7,113,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 25,940,926 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 33,053,926 |  |  |
Accumulated Depreciation | (10,427,553) |  |  |
Investment in Real Estate, Net | 22,626,373 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 14,501,551 |  |  |
Gaithersburg Station [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Gaithersburg, MD |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 389 |  |  |
Initial Cost to Company, Land | $ 17,500,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 74,678,917 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 814,507 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 17,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 75,493,424 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 92,993,424 |  |  |
Accumulated Depreciation | (15,197,790) |  |  |
Investment in Real Estate, Net | 77,795,634 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 95,368,543 |  |  |
Glo [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 201 |  |  |
Initial Cost to Company, Land | $ 16,047,022 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 48,650,963 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,068,235 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 16,047,022 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 51,719,198 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 67,766,220 |  |  |
Accumulated Depreciation | (14,061,824) |  |  |
Investment in Real Estate, Net | 53,704,396 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 32,031,227 |  |  |
Hathaway [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Long Beach, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 385 |  |  |
Initial Cost to Company, Land | $ 2,512,500 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 22,611,912 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 9,165,543 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 2,512,500 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,777,455 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 34,289,955 |  |  |
Accumulated Depreciation | (24,359,922) |  |  |
Investment in Real Estate, Net | 9,930,033 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 46,479,980 |  |  |
Heights on Capitol Hill [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 104 |  |  |
Initial Cost to Company, Land | $ 5,425,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 21,138,028 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,483,284 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,425,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,621,312 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 28,046,312 |  |  |
Accumulated Depreciation | (9,090,011) |  |  |
Investment in Real Estate, Net | 18,956,301 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 25,887,074 |  |  |
Kelvin Court (fka Alta Pacific) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Irvine, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 132 |  |  |
Initial Cost to Company, Land | $ 10,752,145 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 34,628,115 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 648,366 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 10,752,145 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 35,276,481 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 46,028,626 |  |  |
Accumulated Depreciation | (11,953,874) |  |  |
Investment in Real Estate, Net | 34,074,752 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 26,226,033 |  |  |
Kenwood Mews [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Burbank, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 141 |  |  |
Initial Cost to Company, Land | $ 14,100,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 24,662,883 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,580,534 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 14,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 28,243,417 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 42,343,417 |  |  |
Accumulated Depreciation | (12,733,507) |  |  |
Investment in Real Estate, Net | $ 29,609,910 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (I) |  |  |
La Terrazza at Colma Station [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Colma, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 155 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 41,251,044 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,206,497 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 42,457,541 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 42,457,541 |  |  |
Accumulated Depreciation | (16,832,082) |  |  |
Investment in Real Estate, Net | 25,625,459 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 24,987,438 |  |  |
Laguna Clara [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Santa Clara, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 264 |  |  |
Initial Cost to Company, Land | $ 13,642,420 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 29,707,475 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,969,596 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 13,642,420 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 34,677,071 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 48,319,491 |  |  |
Accumulated Depreciation | (18,383,225) |  |  |
Investment in Real Estate, Net | $ 29,936,266 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (I) |  |  |
Liberty Park [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Braintree, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 202 |  |  |
Initial Cost to Company, Land | $ 5,977,504 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 26,749,111 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,357,010 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,977,504 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 33,106,121 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 39,083,625 |  |  |
Accumulated Depreciation | (17,080,472) |  |  |
Investment in Real Estate, Net | 22,003,153 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 24,956,877 |  |  |
Liberty Tower [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 235 |  |  |
Initial Cost to Company, Land | $ 16,382,822 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 83,817,078 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,975,311 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 16,382,822 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 85,792,389 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 102,175,211 |  |  |
Accumulated Depreciation | (26,194,514) |  |  |
Investment in Real Estate, Net | 75,980,697 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 43,515,440 |  |  |
Longview Place [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Waltham, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 348 |  |  |
Initial Cost to Company, Land | $ 20,880,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 90,255,509 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,422,745 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 20,880,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 95,678,254 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 116,558,254 |  |  |
Accumulated Depreciation | (41,854,802) |  |  |
Investment in Real Estate, Net | 74,703,452 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 70,793,963 |  |  |
Market Street Village [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Diego, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 229 |  |  |
Initial Cost to Company, Land | $ 13,740,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 40,757,301 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,123,013 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 13,740,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 42,880,314 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 56,620,314 |  |  |
Accumulated Depreciation | (18,041,199) |  |  |
Investment in Real Estate, Net | $ 38,579,115 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (I) |  |  |
Metro on First [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 102 |  |  |
Initial Cost to Company, Land | $ 8,540,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 12,209,981 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,141,118 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 8,540,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 14,351,099 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 22,891,099 |  |  |
Accumulated Depreciation | (5,948,086) |  |  |
Investment in Real Estate, Net | 16,943,013 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 22,629,291 |  |  |
Mill Creek [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Milpitas, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 516 |  |  |
Initial Cost to Company, Land | $ 12,858,693 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 57,168,503 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 9,899,985 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 12,858,693 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 67,068,488 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 79,927,181 |  |  |
Accumulated Depreciation | (33,621,630) |  |  |
Investment in Real Estate, Net | 46,305,551 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 69,262,254 |  |  |
Moda [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 251 |  |  |
Initial Cost to Company, Land | $ 12,649,228 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 36,842,012 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,017,073 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 12,649,228 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,859,085 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 50,508,313 |  |  |
Accumulated Depreciation | (12,489,032) |  |  |
Investment in Real Estate, Net | $ 38,019,281 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (K) |  |  |
Montierra (CA) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Diego, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 272 |  |  |
Initial Cost to Company, Land | $ 8,160,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 29,360,938 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 7,947,448 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 8,160,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,308,386 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 45,468,386 |  |  |
Accumulated Depreciation | (24,130,197) |  |  |
Investment in Real Estate, Net | $ 21,338,189 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (I) |  |  |
Olympus Towers [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 328 |  |  |
Initial Cost to Company, Land | $ 14,752,034 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 73,335,425 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 8,745,325 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 14,752,034 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 82,080,750 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 96,832,784 |  |  |
Accumulated Depreciation | (39,929,257) |  |  |
Investment in Real Estate, Net | 56,903,527 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 49,788,935 |  |  |
Park Place at San Mateo (fka San Mateo) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Mateo, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 575 |  |  |
Initial Cost to Company, Land | $ 71,900,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 211,907,141 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 11,404,928 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 71,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 223,312,069 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 295,212,069 |  |  |
Accumulated Depreciation | (47,760,787) |  |  |
Investment in Real Estate, Net | $ 247,451,282 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
Reserve at Clarendon Centre, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 252 |  |  |
Initial Cost to Company, Land | $ 10,500,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 52,812,935 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,599,506 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 10,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 57,412,441 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 67,912,441 |  |  |
Accumulated Depreciation | (28,603,885) |  |  |
Investment in Real Estate, Net | $ 39,308,556 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (I) |  |  |
Reserve at Eisenhower, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Alexandria, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 226 |  |  |
Initial Cost to Company, Land | $ 6,500,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 34,585,060 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,865,452 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 6,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 38,450,512 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 44,950,512 |  |  |
Accumulated Depreciation | (19,227,311) |  |  |
Investment in Real Estate, Net | $ 25,723,201 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (I) |  |  |
Reserve at Fairfax Corners [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Fairfax, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 652 |  |  |
Initial Cost to Company, Land | $ 15,804,057 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 63,129,051 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 11,326,169 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 15,804,057 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 74,455,220 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 90,259,277 |  |  |
Accumulated Depreciation | (38,763,866) |  |  |
Investment in Real Estate, Net | 51,495,411 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 84,677,136 |  |  |
Siena Terrace [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Lake Forest, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 356 |  |  |
Initial Cost to Company, Land | $ 8,900,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 24,083,024 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 7,129,612 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 8,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,212,636 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 40,112,636 |  |  |
Accumulated Depreciation | (20,109,124) |  |  |
Investment in Real Estate, Net | 20,003,512 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 64,414,512 |  |  |
SoMa Square Apartments (fka South Market) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Francisco, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 410 |  |  |
Initial Cost to Company, Land | $ 79,900,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 177,316,977 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 9,300,349 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 79,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 186,617,326 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 266,517,326 |  |  |
Accumulated Depreciation | (38,289,333) |  |  |
Investment in Real Estate, Net | $ 228,227,993 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
Skyview [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Rancho Santa Margarita, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 260 |  |  |
Initial Cost to Company, Land | $ 3,380,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 21,952,863 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,298,716 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 3,380,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 27,251,579 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 30,631,579 |  |  |
Accumulated Depreciation | (16,612,037) |  |  |
Investment in Real Estate, Net | 14,019,542 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 47,183,965 |  |  |
Square One [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 112 |  |  |
Initial Cost to Company, Land | $ 7,222,544 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 26,277,456 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 29,629 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 7,222,544 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,307,085 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 33,529,629 |  |  |
Accumulated Depreciation | (4,313,830) |  |  |
Investment in Real Estate, Net | $ 29,215,799 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (K) |  |  |
Summerset Village [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Chatsworth, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 280 |  |  |
Initial Cost to Company, Land | $ 2,629,804 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 23,670,889 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 7,787,016 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 2,629,804 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,457,905 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 34,087,709 |  |  |
Accumulated Depreciation | (22,465,064) |  |  |
Investment in Real Estate, Net | 11,622,645 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 38,007,297 |  |  |
Talleyrand [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Tarrytown, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 300 |  |  |
Initial Cost to Company, Land | $ 12,000,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 49,838,160 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,352,043 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 12,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 56,190,203 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 68,190,203 |  |  |
Accumulated Depreciation | (31,701,891) |  |  |
Investment in Real Estate, Net | 36,488,312 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 34,811,455 |  |  |
Teresina [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Chula Vista, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 440 |  |  |
Initial Cost to Company, Land | $ 28,600,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 61,916,670 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,715,027 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 28,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 67,631,697 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 96,231,697 |  |  |
Accumulated Depreciation | (29,443,097) |  |  |
Investment in Real Estate, Net | 66,788,600 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 38,425,773 |  |  |
Toscana [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Irvine, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 563 |  |  |
Initial Cost to Company, Land | $ 39,410,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 50,806,072 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 17,577,052 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 39,410,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 68,383,124 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 107,793,124 |  |  |
Accumulated Depreciation | (37,833,043) |  |  |
Investment in Real Estate, Net | 69,960,081 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 98,047,399 |  |  |
Touriel Building [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Berkeley, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 35 |  |  |
Initial Cost to Company, Land | $ 2,736,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 7,810,027 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 186,222 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 2,736,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 7,996,249 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 10,732,249 |  |  |
Accumulated Depreciation | (3,315,964) |  |  |
Investment in Real Estate, Net | 7,416,285 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 4,969,645 |  |  |
Town Square at Mark Center I (fka Millbrook I) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Alexandria, VA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 406 |  |  |
Initial Cost to Company, Land | $ 24,360,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 86,178,714 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 7,407,814 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 24,360,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 93,586,528 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 117,946,528 |  |  |
Accumulated Depreciation | (41,076,185) |  |  |
Investment in Real Estate, Net | 76,870,343 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 60,225,838 |  |  |
Vantage Hollywood [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 298 |  |  |
Initial Cost to Company, Land | $ 42,580,326 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 56,014,674 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 457,365 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 42,580,326 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 56,472,039 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 99,052,365 |  |  |
Accumulated Depreciation | (7,801,330) |  |  |
Investment in Real Estate, Net | 91,251,035 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 41,416,137 |  |  |
Versailles [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Woodland Hills, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 253 |  |  |
Initial Cost to Company, Land | $ 12,650,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 33,656,292 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 7,159,381 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 12,650,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 40,815,673 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 53,465,673 |  |  |
Accumulated Depreciation | (21,305,317) |  |  |
Investment in Real Estate, Net | 32,160,356 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 30,347,501 |  |  |
Versailles (K-Town) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 225 |  |  |
Initial Cost to Company, Land | $ 10,590,975 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 44,409,025 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,547,377 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 10,590,975 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,956,402 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 56,547,377 |  |  |
Accumulated Depreciation | (15,658,207) |  |  |
Investment in Real Estate, Net | 40,889,170 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 45,964,864 |  |  |
Victor on Venice [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 115 |  |  |
Initial Cost to Company, Land | $ 10,350,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 35,433,437 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 797,872 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 10,350,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 36,231,309 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 46,581,309 |  |  |
Accumulated Depreciation | (14,701,990) |  |  |
Investment in Real Estate, Net | $ 31,879,319 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (I) |  |  |
Vintage at 425 Broadway (fka Promenade) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Santa Monica, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 60 |  |  |
Initial Cost to Company, Land | $ 9,000,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 13,961,523 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,555,558 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 9,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 15,517,081 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 24,517,081 |  |  |
Accumulated Depreciation | (3,564,636) |  |  |
Investment in Real Estate, Net | $ 20,952,445 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
West 54th [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 222 |  |  |
Initial Cost to Company, Land | $ 60,900,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 48,193,837 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,225,501 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 60,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 51,419,338 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 112,319,338 |  |  |
Accumulated Depreciation | (12,886,577) |  |  |
Investment in Real Estate, Net | 99,432,761 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 47,667,759 |  |  |
Westgate (fka Westgate I) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Pasadena, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 480 |  |  |
Initial Cost to Company, Land | $ 22,898,848 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 133,484,573 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,262,866 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 22,898,848 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 135,747,439 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 158,646,287 |  |  |
Accumulated Depreciation | (32,510,875) |  |  |
Investment in Real Estate, Net | 126,135,412 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 95,981,749 |  |  |
Woodleaf [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Campbell, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 178 |  |  |
Initial Cost to Company, Land | $ 8,550,600 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 16,988,183 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,069,445 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 8,550,600 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,057,628 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 30,608,228 |  |  |
Accumulated Depreciation | (14,254,057) |  |  |
Investment in Real Estate, Net | 16,354,171 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 17,819,380 |  |  |
Portfolio Entity Encumbrances [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit |  |  |  |
Initial Cost to Company, Land |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures |  |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures |  |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures |  |  |  |
Accumulated Depreciation |  |  |  |
Investment in Real Estate, Net |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 1,346,853,789 |  |  |
Investment in Real Estate - Wholly Owned Encumbered [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 18,497 |  |  |
Initial Cost to Company, Land | $ 1,401,915,995 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 3,881,590,219 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 316,875,095 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 1,401,915,995 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 4,198,465,314 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 5,600,381,309 |  |  |
Accumulated Depreciation | (1,440,591,113) |  |  |
Investment in Real Estate, Net | 4,159,790,196 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 3,316,375,422 |  |  |
2300 Elliott [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 92 |  |  |
Initial Cost to Company, Land | $ 796,800 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 7,173,725 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,717,795 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 796,800 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 13,891,520 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 14,688,320 |  |  |
Accumulated Depreciation | (10,921,953) |  |  |
Investment in Real Estate, Net | 3,766,367 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Canyon Ridge [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Diego, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 162 |  |  |
Initial Cost to Company, Land | $ 4,869,448 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 11,955,064 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,954,912 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 4,869,448 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 15,909,976 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 20,779,424 |  |  |
Accumulated Depreciation | (10,552,909) |  |  |
Investment in Real Estate, Net | 10,226,515 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Country Oaks [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Agoura Hills, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 256 |  |  |
Initial Cost to Company, Land | $ 6,105,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 29,561,865 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,647,900 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 6,105,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 36,209,765 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 42,314,765 |  |  |
Accumulated Depreciation | (19,712,219) |  |  |
Investment in Real Estate, Net | 22,602,546 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Harrison Square (fka Elliot Bay) [Domain] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 166 |  |  |
Initial Cost to Company, Land | $ 7,600,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 35,844,345 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,069,730 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 7,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 40,914,075 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 48,514,075 |  |  |
Accumulated Depreciation | (9,358,506) |  |  |
Investment in Real Estate, Net | 39,155,569 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Monterra in Mill Creek [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Mill Creek, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 139 |  |  |
Initial Cost to Company, Land | $ 2,800,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 13,255,123 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,003,101 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 2,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 14,258,224 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 17,058,224 |  |  |
Accumulated Depreciation | (6,620,281) |  |  |
Investment in Real Estate, Net | 10,437,943 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Rosecliff [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Quincy, MA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 156 |  |  |
Initial Cost to Company, Land | $ 5,460,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 15,721,570 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,530,721 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,460,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 19,252,291 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 24,712,291 |  |  |
Accumulated Depreciation | (12,249,762) |  |  |
Investment in Real Estate, Net | 12,462,529 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Strayhorse at Arrowhead Ranch [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Glendale, AZ |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 136 |  |  |
Initial Cost to Company, Land | $ 4,400,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 12,968,002 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 802,003 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 4,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 13,770,005 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 18,170,005 |  |  |
Accumulated Depreciation | (6,164,596) |  |  |
Investment in Real Estate, Net | 12,005,409 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Via Ventura (CA) (fka Ventura) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Ventura, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 192 |  |  |
Initial Cost to Company, Land | $ 8,600,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 44,308,202 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 845,940 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 8,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,154,142 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 53,754,142 |  |  |
Accumulated Depreciation | (10,983,822) |  |  |
Investment in Real Estate, Net | 42,770,320 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Wood Creek II (fka Willow Brook (CA)) |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Pleasant Hill, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 228 |  |  |
Initial Cost to Company, Land | $ 5,055,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 38,388,672 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,551,944 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,055,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 44,940,616 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 49,995,616 |  |  |
Accumulated Depreciation | (22,087,591) |  |  |
Investment in Real Estate, Net | 27,908,025 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Investment in Real Estate - Partially Owned Unencumbered [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 1,527 |  |  |
Initial Cost to Company, Land | $ 45,686,248 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 209,176,568 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 35,124,046 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 45,686,248 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 244,300,614 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 289,986,862 |  |  |
Accumulated Depreciation | (108,651,639) |  |  |
Investment in Real Estate, Net | 181,335,223 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Bellevue Meadows [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Bellevue, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 180 |  |  |
Initial Cost to Company, Land | $ 4,507,100 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 12,574,814 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,487,604 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 4,507,100 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,062,418 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 22,569,518 |  |  |
Accumulated Depreciation | (12,705,342) |  |  |
Investment in Real Estate, Net | 9,864,176 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 16,504,927 |  |  |
Canyon Creek (CA) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Ramon, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 268 |  |  |
Initial Cost to Company, Land | $ 5,425,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 18,812,120 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 7,580,209 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,425,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,392,329 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 31,817,329 |  |  |
Accumulated Depreciation | (16,113,349) |  |  |
Investment in Real Estate, Net | 15,703,980 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 28,129,557 |  |  |
Lantern Cove [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Foster City, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 232 |  |  |
Initial Cost to Company, Land | $ 6,945,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 23,064,976 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,401,023 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 6,945,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 29,465,999 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 36,410,999 |  |  |
Accumulated Depreciation | (17,362,236) |  |  |
Investment in Real Estate, Net | 19,048,763 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 36,410,267 |  |  |
Schooner Bay I [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Foster City, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 168 |  |  |
Initial Cost to Company, Land | $ 5,345,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 20,390,618 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,132,524 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,345,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 25,523,142 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 30,868,142 |  |  |
Accumulated Depreciation | (15,015,057) |  |  |
Investment in Real Estate, Net | 15,853,085 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 28,825,496 |  |  |
Schooner Bay II [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Foster City, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 144 |  |  |
Initial Cost to Company, Land | $ 4,550,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 18,064,764 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,600,065 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 4,550,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,664,829 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 27,214,829 |  |  |
Accumulated Depreciation | (13,411,541) |  |  |
Investment in Real Estate, Net | 13,803,288 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 26,130,631 |  |  |
Surrey Downs [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Bellevue, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 122 |  |  |
Initial Cost to Company, Land | $ 3,057,100 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 7,848,618 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,159,103 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 3,057,100 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 11,007,721 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 14,064,821 |  |  |
Accumulated Depreciation | (7,377,616) |  |  |
Investment in Real Estate, Net | 6,687,205 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 9,810,499 |  |  |
Virgil Square [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 142 |  |  |
Initial Cost to Company, Land | $ 5,500,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 15,216,613 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,890,085 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 5,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,106,698 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 23,606,698 |  |  |
Accumulated Depreciation | (8,612,798) |  |  |
Investment in Real Estate, Net | 14,993,900 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 9,877,693 |  |  |
Wisconsin Place [Domain] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Chevy Chase, MD |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 432 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 172,089,355 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,148,714 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 173,238,069 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 173,238,069 |  |  |
Accumulated Depreciation | (37,293,147) |  |  |
Investment in Real Estate, Net | 135,944,922 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 146,657,506 |  |  |
Investment in Real Estate - Partially Owned Encumbered [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 1,688 |  |  |
Initial Cost to Company, Land | $ 35,329,200 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 288,061,878 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 36,399,327 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 35,329,200 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 324,461,205 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 359,790,405 |  |  |
Accumulated Depreciation | (127,891,086) |  |  |
Investment in Real Estate, Net | 231,899,319 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 302,346,576 |  |  |
Total Consolidated Investment in Real Estate [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 77,666 |  |  |
Initial Cost to Company, Land | $ 6,101,789,051 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 18,405,561,077 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,519,546,263 |  |  |
Gross Amount Carried at close of period 12/31/2017, Land | 6,101,789,051 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 19,925,107,340 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 26,026,896,391 |  |  |
Accumulated Depreciation | (6,040,378,191) |  |  |
Investment in Real Estate, Net | 19,986,518,200 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 3,618,721,998 |  |  |

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