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Schedule III - Real Estate and Accumulated Depreciation (Details) | 12 Months Ended |  |  |
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Dec. 31, 2018 USD ($) ApartmentUnit | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Accumulated Depreciation | $ (6,696,281,000) | $ (6,040,378,000) | $ (5,360,389,000) | $ (6,084,616,000)
100 K Apartments (fka 100K 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 | 222 |  |  |
Initial Cost to Company, Land | $ 15,600,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 69,516,265 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 15,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 69,516,265 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 85,116,265 |  |  |
Accumulated Depreciation | (270,039) |  |  |
Investment in Real Estate, Net | 84,846,226 |  |  |
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 | 9,479,410 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 103,539,100 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 103,562,135 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 207,101,235 |  |  |
Accumulated Depreciation | (48,691,122) |  |  |
Investment in Real Estate, Net | 158,410,113 |  |  |
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 | 15,656,370 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 139,933,500 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 206,621,115 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 346,554,615 |  |  |
Accumulated Depreciation | (96,815,700) |  |  |
Investment in Real Estate, Net | 249,738,915 |  |  |
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 | 112,096,955 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 235,580 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 112,332,535 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 112,332,535 |  |  |
Accumulated Depreciation | (16,016,094) |  |  |
Investment in Real Estate, Net | 96,316,441 |  |  |
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 | 1,701,936 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 22,037,831 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 55,664,105 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 77,701,936 |  |  |
Accumulated Depreciation | (16,317,361) |  |  |
Investment in Real Estate, Net | 61,384,575 |  |  |
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 | 3,859,381 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 32,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 96,534,609 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 128,934,609 |  |  |
Accumulated Depreciation | (23,584,176) |  |  |
Investment in Real Estate, Net | 105,350,433 |  |  |
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 | 13,831,031 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 144,968,250 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 152,177,712 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 297,145,962 |  |  |
Accumulated Depreciation | (72,790,895) |  |  |
Investment in Real Estate, Net | 224,355,067 |  |  |
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 | 94,758,679 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 278,928 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 18,937,702 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 95,037,607 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 113,975,309 |  |  |
Accumulated Depreciation | (22,340,533) |  |  |
Investment in Real Estate, Net | 91,634,776 |  |  |
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 | $ 9,213,512 |  |  |
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 | 2,537,398 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 9,213,512 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 39,096,587 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 48,310,099 |  |  |
Accumulated Depreciation | (18,478,163) |  |  |
Investment in Real Estate, Net | 29,831,936 |  |  |
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 | 24,121,307 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 10,401,958 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 24,121,307 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 34,523,265 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 34,523,265 |  |  |
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 | 15,209,807 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 54,638,298 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 55,571,509 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 110,209,807 |  |  |
Accumulated Depreciation | (26,934,077) |  |  |
Investment in Real Estate, Net | 83,275,730 |  |  |
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 | 6,217,218 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 31,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 115,222,952 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 146,622,952 |  |  |
Accumulated Depreciation | (28,057,310) |  |  |
Investment in Real Estate, Net | 118,565,642 |  |  |
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 | 2,567,690 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 11,321,198 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 52,241,865 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 63,563,063 |  |  |
Accumulated Depreciation | (13,457,087) |  |  |
Investment in Real Estate, Net | 50,105,976 |  |  |
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 | 3,697,727 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 21,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 82,422,390 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 104,322,390 |  |  |
Accumulated Depreciation | (20,152,746) |  |  |
Investment in Real Estate, Net | 84,169,644 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
2400 M St [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 | 4,562,289 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 30,006,593 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 118,576,074 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 148,582,667 |  |  |
Accumulated Depreciation | (53,570,540) |  |  |
Investment in Real Estate, Net | 95,012,127 |  |  |
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 | 21,564,301 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 4,603,326 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 21,564,301 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 26,167,627 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 26,167,627 |  |  |
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 | 766,896 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 14,450,070 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 116,591,826 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 131,041,896 |  |  |
Accumulated Depreciation | (18,672,172) |  |  |
Investment in Real Estate, Net | 112,369,724 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
340 Fremont (fka Rincon Hill) [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 | 247,811,082 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 92,829 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 42,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 247,903,911 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 289,903,911 |  |  |
Accumulated Depreciation | (23,751,926) |  |  |
Investment in Real Estate, Net | 266,151,985 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
3003 Van Ness (fka 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 | 6,576,256 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 56,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 147,767,836 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 204,067,836 |  |  |
Accumulated Depreciation | (38,475,875) |  |  |
Investment in Real Estate, Net | 165,591,961 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
45 Worthington (City View 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 | 0 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 2,644,777 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 2,644,777 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 2,644,777 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 2,644,777 |  |  |
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 | 4,379,551 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 28,150,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 142,979,551 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 171,129,551 |  |  |
Accumulated Depreciation | (48,799,382) |  |  |
Investment in Real Estate, Net | 122,330,169 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
455 Eye 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 | $ 11,941,406 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 61,395,797 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 20,856 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 11,941,406 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 61,416,653 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 73,358,059 |  |  |
Accumulated Depreciation | (3,530,514) |  |  |
Investment in Real Estate, Net | 69,827,545 |  |  |
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 | 30,602,147 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 76,921,130 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 184,549,829 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 261,470,959 |  |  |
Accumulated Depreciation | (58,855,681) |  |  |
Investment in Real Estate, Net | 202,615,278 |  |  |
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 | 3,766,336 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 3,766,336 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 3,766,336 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 3,766,336 |  |  |
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 | 14,133,106 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 13,131,456 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 14,133,106 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 27,264,562 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 27,264,562 |  |  |
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 | 1,100,410 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 32,852,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 44,240,961 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 77,092,961 |  |  |
Accumulated Depreciation | (20,829,342) |  |  |
Investment in Real Estate, Net | 56,263,619 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
660 Washington (fka Boston Common) [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 | 3,523,700 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 106,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 169,835,379 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 275,935,379 |  |  |
Accumulated Depreciation | (41,138,920) |  |  |
Investment in Real Estate, Net | 234,796,459 |  |  |
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 | 2,269,833 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 28,108,899 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 239,033,386 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 267,142,285 |  |  |
Accumulated Depreciation | (73,802,320) |  |  |
Investment in Real Estate, Net | 193,339,965 |  |  |
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 | 15,001,275 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 22,611,600 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 92,493,446 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 115,105,046 |  |  |
Accumulated Depreciation | (47,229,499) |  |  |
Investment in Real Estate, Net | 67,875,547 |  |  |
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 | 443,622 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,249,124 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 19,053,498 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 24,302,622 |  |  |
Accumulated Depreciation | (5,793,095) |  |  |
Investment in Real Estate, Net | 18,509,527 |  |  |
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 | 6,604,709 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 27,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 175,597,149 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 203,497,149 |  |  |
Accumulated Depreciation | (41,358,995) |  |  |
Investment in Real Estate, Net | 162,138,154 |  |  |
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 | 4,014,061 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 65,352,706 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 69,761,355 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 135,114,061 |  |  |
Accumulated Depreciation | (28,362,079) |  |  |
Investment in Real Estate, Net | 106,751,982 |  |  |
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 | 3,069,561 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 7,786,800 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 34,656,886 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 42,443,686 |  |  |
Accumulated Depreciation | (10,033,292) |  |  |
Investment in Real Estate, Net | 32,410,394 |  |  |
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 | 449 |  |  |
Initial Cost to Company, Land | $ 41,363,921 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 280,655,909 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 32,065 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 41,363,921 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 280,687,974 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 322,051,895 |  |  |
Accumulated Depreciation | (12,233,138) |  |  |
Investment in Real Estate, Net | 309,818,757 |  |  |
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 | 2,165,266 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,839,548 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,525,718 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 37,365,266 |  |  |
Accumulated Depreciation | (11,163,153) |  |  |
Investment in Real Estate, Net | 26,202,113 |  |  |
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 | 303,373 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,550,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 16,088,882 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 21,638,882 |  |  |
Accumulated Depreciation | (7,089,343) |  |  |
Investment in Real Estate, Net | 14,549,539 |  |  |
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 | 4,895,344 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 18,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 94,689,545 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 113,589,545 |  |  |
Accumulated Depreciation | (22,245,031) |  |  |
Investment in Real Estate, Net | 91,344,514 |  |  |
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 | 9,293,818 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 24,310,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 68,507,947 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 92,817,947 |  |  |
Accumulated Depreciation | (41,761,182) |  |  |
Investment in Real Estate, Net | 51,056,765 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Altitude (fka Village at Howard Hughes, The (Lots 1 & 2)) [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 | 148,378,972 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 123,006 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 43,783,485 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 148,501,978 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 192,285,463 |  |  |
Accumulated Depreciation | (14,509,419) |  |  |
Investment in Real Estate, Net | 177,776,044 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Alton, The (fka Millikan) [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 | 95,898,795 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 27,038 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 11,049,027 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 95,925,833 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 106,974,860 |  |  |
Accumulated Depreciation | (7,393,177) |  |  |
Investment in Real Estate, Net | 99,581,683 |  |  |
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 | 9,866,646 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 9,057,300 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 28,350,288 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 37,407,588 |  |  |
Accumulated Depreciation | (16,398,864) |  |  |
Investment in Real Estate, Net | 21,008,724 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 2,142,608 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 26,650,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 64,992,608 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 91,642,608 |  |  |
Accumulated Depreciation | (22,783,366) |  |  |
Investment in Real Estate, Net | 68,859,242 |  |  |
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 | 2,118,504 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 1,642,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 11,271,022 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 12,913,022 |  |  |
Accumulated Depreciation | (4,123,265) |  |  |
Investment in Real Estate, Net | 8,789,757 |  |  |
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 | 1,046,371 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 8,000,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,120,971 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 45,121,371 |  |  |
Accumulated Depreciation | (11,684,515) |  |  |
Investment in Real Estate, Net | 33,436,856 |  |  |
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 | 267 |  |  |
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 | 6,802,555 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 12,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 68,268,822 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 80,568,822 |  |  |
Accumulated Depreciation | (17,833,191) |  |  |
Investment in Real Estate, Net | 62,735,631 |  |  |
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 | 313,737 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 32,401,680 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 47,449,169 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 79,850,849 |  |  |
Accumulated Depreciation | (6,648,014) |  |  |
Investment in Real Estate, Net | 73,202,835 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 18,497,683 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,876,996 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 12,960,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,374,679 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,334,679 |  |  |
Accumulated Depreciation | (10,360,476) |  |  |
Investment in Real Estate, Net | 24,974,203 |  |  |
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 | 2,385,284 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 7,995,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 20,390,284 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 28,385,284 |  |  |
Accumulated Depreciation | (6,758,825) |  |  |
Investment in Real Estate, Net | 21,626,459 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Azure (fka Mission Bay-Block 13) [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 | 152,628,044 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 201,962 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 32,855,115 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 152,830,006 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 185,685,121 |  |  |
Accumulated Depreciation | (19,304,541) |  |  |
Investment in Real Estate, Net | 166,380,580 |  |  |
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 | 3,501,456 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 7,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 30,938,695 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 38,538,695 |  |  |
Accumulated Depreciation | (15,493,308) |  |  |
Investment in Real Estate, Net | 23,045,387 |  |  |
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 | 1,583,190 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 114,351,405 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 167,231,785 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 281,583,190 |  |  |
Accumulated Depreciation | (46,223,187) |  |  |
Investment in Real Estate, Net | 235,360,003 |  |  |
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 12/31/2018, 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 | (83,348) |  |  |
Investment in Real Estate, Net | 218,065 |  |  |
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 | 1,277,604 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 9,098,808 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 29,978,796 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 39,077,604 |  |  |
Accumulated Depreciation | (8,865,592) |  |  |
Investment in Real Estate, Net | 30,212,012 |  |  |
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 | 2,103,728 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 75,292,990 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 75,292,990 |  |  |
Accumulated Depreciation | (19,870,053) |  |  |
Investment in Real Estate, Net | 55,422,937 |  |  |
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 | 4,121,529 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 9,991,500 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,368,807 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 36,360,307 |  |  |
Accumulated Depreciation | (17,956,685) |  |  |
Investment in Real Estate, Net | 18,403,622 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Bridford Lakes II [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 12/31/2018, 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 | 3,760,049 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 40,099,922 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 225,198,680 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 265,298,602 |  |  |
Accumulated Depreciation | (61,813,037) |  |  |
Investment in Real Estate, Net | 203,485,565 |  |  |
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 | 192,535 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 17,125,766 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 28,266,769 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 45,392,535 |  |  |
Accumulated Depreciation | (3,822,366) |  |  |
Investment in Real Estate, Net | 41,570,169 |  |  |
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 | 8,584,023 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 10,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 59,951,936 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 69,951,936 |  |  |
Accumulated Depreciation | (32,763,420) |  |  |
Investment in Real Estate, Net | 37,188,516 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 12,173,035 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 2,288,300 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 32,769,316 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,057,616 |  |  |
Accumulated Depreciation | (27,594,760) |  |  |
Investment in Real Estate, Net | 7,462,856 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Cascade [Member] |  |  |  |
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 | 148,150,309 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,109 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 23,751,564 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 148,151,418 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 171,902,982 |  |  |
Accumulated Depreciation | (8,307,229) |  |  |
Investment in Real Estate, Net | 163,595,753 |  |  |
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 | 12,240,924 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 9,700,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 82,321,302 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 92,021,302 |  |  |
Accumulated Depreciation | (40,391,210) |  |  |
Investment in Real Estate, Net | 51,630,092 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Centre Club Combined [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 | 9,207,501 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 7,436,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 42,222,290 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 49,658,290 |  |  |
Accumulated Depreciation | (24,948,636) |  |  |
Investment in Real Estate, Net | 24,709,654 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Chloe [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 117 |  |  |
Initial Cost to Company, Land | $ 14,835,571 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 39,359,650 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 628,879 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 14,835,571 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 39,988,529 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 54,824,100 |  |  |
Accumulated Depreciation | (2,779,352) |  |  |
Investment in Real Estate, Net | 52,044,748 |  |  |
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 | 3,104,358 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,220,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 19,849,001 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 25,069,001 |  |  |
Accumulated Depreciation | (10,167,185) |  |  |
Investment in Real Estate, Net | 14,901,816 |  |  |
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 | 7,410,552 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 40,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 103,347,598 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 143,747,598 |  |  |
Accumulated Depreciation | (25,436,921) |  |  |
Investment in Real Estate, Net | 118,310,677 |  |  |
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 | 2,047,704 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 6,863,792 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 38,523,912 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 45,387,704 |  |  |
Accumulated Depreciation | (14,150,420) |  |  |
Investment in Real Estate, Net | 31,237,284 |  |  |
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 | 3,476,525 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 15,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,352,782 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 60,452,782 |  |  |
Accumulated Depreciation | (11,624,754) |  |  |
Investment in Real Estate, Net | 48,828,028 |  |  |
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 | 13,594,830 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 14,704,898 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 92,789,932 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 107,494,830 |  |  |
Accumulated Depreciation | (33,266,169) |  |  |
Investment in Real Estate, Net | 74,228,661 |  |  |
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 | 2,390,107 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 30,400,340 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 106,214,767 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 136,615,107 |  |  |
Accumulated Depreciation | (33,551,922) |  |  |
Investment in Real Estate, Net | 103,063,185 |  |  |
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 | 3,945,639 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 6,615,467 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,774,974 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 25,390,441 |  |  |
Accumulated Depreciation | (9,223,334) |  |  |
Investment in Real Estate, Net | 16,167,107 |  |  |
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 | 9,236,604 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 27,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 123,238,899 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 150,838,899 |  |  |
Accumulated Depreciation | (29,100,080) |  |  |
Investment in Real Estate, Net | 121,738,819 |  |  |
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 | 1,945,268 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 13,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 28,858,381 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 42,358,381 |  |  |
Accumulated Depreciation | (7,970,206) |  |  |
Investment in Real Estate, Net | 34,388,175 |  |  |
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 | 5,810,948 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 93,196,972 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 93,196,972 |  |  |
Accumulated Depreciation | (25,008,039) |  |  |
Investment in Real Estate, Net | 68,188,933 |  |  |
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 | 4,714,294 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 9,606,600 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 25,907,525 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,514,125 |  |  |
Accumulated Depreciation | (17,827,109) |  |  |
Investment in Real Estate, Net | 17,687,016 |  |  |
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 | 9,986,941 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 32,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 95,106,265 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 127,406,265 |  |  |
Accumulated Depreciation | (23,112,933) |  |  |
Investment in Real Estate, Net | 104,293,332 |  |  |
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 | 3,799,780 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 17,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 51,718,755 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 68,918,755 |  |  |
Accumulated Depreciation | (13,497,731) |  |  |
Investment in Real Estate, Net | 55,421,024 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Deerwood (SD) |  |  |  |
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 | 15,328,542 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 2,082,095 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 34,068,357 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 36,150,452 |  |  |
Accumulated Depreciation | (29,457,997) |  |  |
Investment in Real Estate, Net | 6,692,455 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Del Mar 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 | 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 | 3,997,663 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 7,801,824 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 40,945,839 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 48,747,663 |  |  |
Accumulated Depreciation | (16,173,191) |  |  |
Investment in Real Estate, Net | 32,574,472 |  |  |
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 | 10,216,962 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 1,808,900 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,491,323 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 28,300,223 |  |  |
Accumulated Depreciation | (19,595,575) |  |  |
Investment in Real Estate, Net | 8,704,648 |  |  |
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 | 1,570,420 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 13,092,552 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,477,868 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 58,570,420 |  |  |
Accumulated Depreciation | (13,558,521) |  |  |
Investment in Real Estate, Net | 45,011,899 |  |  |
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 | 741,173 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 14,080,560 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 57,160,613 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 71,241,173 |  |  |
Accumulated Depreciation | (12,317,955) |  |  |
Investment in Real Estate, Net | 58,923,218 |  |  |
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 | 31,456,250 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 14,855,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 89,022,886 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 103,877,886 |  |  |
Accumulated Depreciation | (59,097,457) |  |  |
Investment in Real Estate, Net | 44,780,429 |  |  |
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 | 2,240,556 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 8,700,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 27,686,559 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 36,386,559 |  |  |
Accumulated Depreciation | (9,771,700) |  |  |
Investment in Real Estate, Net | 26,614,859 |  |  |
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 | 2,547,788 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 25,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 86,534,005 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 112,434,005 |  |  |
Accumulated Depreciation | (22,068,994) |  |  |
Investment in Real Estate, Net | 90,365,011 |  |  |
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 | 4,235,681 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 25,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 82,988,795 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 108,788,795 |  |  |
Accumulated Depreciation | (21,299,475) |  |  |
Investment in Real Estate, Net | 87,489,320 |  |  |
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 | 2,905,707 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 18,144,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 49,473,648 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 67,617,648 |  |  |
Accumulated Depreciation | (23,145,881) |  |  |
Investment in Real Estate, Net | 44,471,767 |  |  |
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 | 15,394,618 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 9,209,780 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 41,117,284 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 50,327,064 |  |  |
Accumulated Depreciation | (24,990,335) |  |  |
Investment in Real Estate, Net | 25,336,729 |  |  |
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 | 5,447,819 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 1,722,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 20,919,248 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 22,641,648 |  |  |
Accumulated Depreciation | (14,374,505) |  |  |
Investment in Real Estate, Net | 8,267,143 |  |  |
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 | 102,450,328 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 792,675 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 103,243,003 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 103,243,003 |  |  |
Accumulated Depreciation | (7,551,227) |  |  |
Investment in Real Estate, Net | 95,691,776 |  |  |
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 | 6,750,493 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 10,806,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,085,823 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 47,891,823 |  |  |
Accumulated Depreciation | (18,306,144) |  |  |
Investment in Real Estate, Net | 29,585,679 |  |  |
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 | $ 59,403,601 |  |  |
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 | 35,187,525 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 59,403,601 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 194,016,957 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 253,420,558 |  |  |
Accumulated Depreciation | (88,466,202) |  |  |
Investment in Real Estate, Net | 164,954,356 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 1,757,739 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,425,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,895,767 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 28,320,767 |  |  |
Accumulated Depreciation | (9,916,225) |  |  |
Investment in Real Estate, Net | 18,404,542 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Helios (fka 2nd+Pine) [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 | 206,297,144 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 14,831 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 18,061,674 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 206,311,975 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 224,373,649 |  |  |
Accumulated Depreciation | (11,942,676) |  |  |
Investment in Real Estate, Net | 212,430,973 |  |  |
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 | 2,560,256 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 10,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 34,368,591 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 45,168,591 |  |  |
Accumulated Depreciation | (16,558,111) |  |  |
Investment in Real Estate, Net | 28,610,480 |  |  |
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 | 4,341,551 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 6,895,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 23,325,148 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 30,220,148 |  |  |
Accumulated Depreciation | (10,981,639) |  |  |
Investment in Real Estate, Net | 19,238,509 |  |  |
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 | 1,045,443 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 23,299,892 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 103,745,551 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 127,045,443 |  |  |
Accumulated Depreciation | (21,321,630) |  |  |
Investment in Real Estate, Net | 105,723,813 |  |  |
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 | 2,174,172 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 10,080,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 39,701,084 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 49,781,084 |  |  |
Accumulated Depreciation | (18,721,344) |  |  |
Investment in Real Estate, Net | 31,059,740 |  |  |
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 | 924,031 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 9,435,760 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 33,488,271 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 42,924,031 |  |  |
Accumulated Depreciation | (10,500,837) |  |  |
Investment in Real Estate, Net | 32,423,194 |  |  |
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 | 2,641,742 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 23,420,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 72,619,441 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 96,039,441 |  |  |
Accumulated Depreciation | (35,972,698) |  |  |
Investment in Real Estate, Net | 60,066,743 |  |  |
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 | 6,559,255 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,350,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 47,673,329 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 53,023,329 |  |  |
Accumulated Depreciation | (24,093,676) |  |  |
Investment in Real Estate, Net | 28,929,653 |  |  |
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 12/31/2018, 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 | 1,470,190 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 2,732,800 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 15,358,472 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 18,091,272 |  |  |
Accumulated Depreciation | (7,954,981) |  |  |
Investment in Real Estate, Net | 10,136,291 |  |  |
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 | 77,708,868 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 400,967 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 14,791,831 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 78,109,835 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 92,901,666 |  |  |
Accumulated Depreciation | (19,685,769) |  |  |
Investment in Real Estate, Net | 73,215,897 |  |  |
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 | 56,246,557 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 110,852 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 11,726,305 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 56,357,409 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 68,083,714 |  |  |
Accumulated Depreciation | (7,480,950) |  |  |
Investment in Real Estate, Net | 60,602,764 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Kelvin, The (fka Modera) [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 | 520,485 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 15,521,552 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 65,373,933 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 80,895,485 |  |  |
Accumulated Depreciation | (10,153,159) |  |  |
Investment in Real Estate, Net | 70,742,326 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 4,006,944 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 14,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 28,669,827 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 42,769,827 |  |  |
Accumulated Depreciation | (13,857,402) |  |  |
Investment in Real Estate, Net | 28,912,425 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 28,128,260 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,050,290 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 13,642,420 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 33,178,550 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 46,820,970 |  |  |
Accumulated Depreciation | (18,704,128) |  |  |
Investment in Real Estate, Net | 28,116,842 |  |  |
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 | 12,850,243 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 27,246,045 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 50,591,293 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 77,837,338 |  |  |
Accumulated Depreciation | (31,145,964) |  |  |
Investment in Real Estate, Net | 46,691,374 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 2,105,715 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 16,382,822 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 85,922,793 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 102,305,615 |  |  |
Accumulated Depreciation | (28,986,710) |  |  |
Investment in Real Estate, Net | 73,318,905 |  |  |
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 | 14,626,711 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,928,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 48,221,973 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 54,150,373 |  |  |
Accumulated Depreciation | (36,031,322) |  |  |
Investment in Real Estate, Net | 18,119,051 |  |  |
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 | 1,577,513 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,805,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 27,282,513 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 33,087,513 |  |  |
Accumulated Depreciation | (9,306,827) |  |  |
Investment in Real Estate, Net | 23,780,686 |  |  |
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 | 732,963 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 20,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 68,641,986 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 88,741,986 |  |  |
Accumulated Depreciation | (16,094,383) |  |  |
Investment in Real Estate, Net | 72,647,603 |  |  |
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 | 6,554,452 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 18,696,674 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 85,000,109 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 103,696,783 |  |  |
Accumulated Depreciation | (20,874,720) |  |  |
Investment in Real Estate, Net | 82,822,063 |  |  |
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 | 3,845,833 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 73,170,045 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 57,808,343 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 130,978,388 |  |  |
Accumulated Depreciation | (24,364,056) |  |  |
Investment in Real Estate, Net | 106,614,332 |  |  |
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 | $ 38,264,917 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 132,175,915 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 82,037,087 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 38,264,917 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 214,213,002 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 252,477,919 |  |  |
Accumulated Depreciation | (143,886,095) |  |  |
Investment in Real Estate, Net | 108,591,824 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 7,188,625 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 20,880,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 97,444,134 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 118,324,134 |  |  |
Accumulated Depreciation | (45,368,039) |  |  |
Investment in Real Estate, Net | 72,956,095 |  |  |
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 | 942,456 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 22,346,513 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 62,443,614 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 84,790,127 |  |  |
Accumulated Depreciation | (15,923,495) |  |  |
Investment in Real Estate, Net | 68,866,632 |  |  |
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 | 8,397,509 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 177,239,951 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 177,239,951 |  |  |
Accumulated Depreciation | (47,146,998) |  |  |
Investment in Real Estate, Net | 130,092,953 |  |  |
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 | 5,580,206 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 60,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 94,891,688 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 155,791,688 |  |  |
Accumulated Depreciation | (24,699,526) |  |  |
Investment in Real Estate, Net | 131,092,162 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 2,328,664 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 13,740,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 43,085,965 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 56,825,965 |  |  |
Accumulated Depreciation | (19,556,103) |  |  |
Investment in Real Estate, Net | 37,269,862 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 2,362,369 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 8,540,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 14,572,350 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 23,112,350 |  |  |
Accumulated Depreciation | (6,573,840) |  |  |
Investment in Real Estate, Net | 16,538,510 |  |  |
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 | 2,883,991 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 8,125,216 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 30,262,775 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 38,387,991 |  |  |
Accumulated Depreciation | (8,050,414) |  |  |
Investment in Real Estate, Net | 30,337,577 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 8,205,107 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 8,160,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,566,045 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 45,726,045 |  |  |
Accumulated Depreciation | (25,291,041) |  |  |
Investment in Real Estate, Net | 20,435,004 |  |  |
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 | 1,270,920 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 60,851,818 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 60,851,818 |  |  |
Accumulated Depreciation | (21,513,518) |  |  |
Investment in Real Estate, Net | 39,338,300 |  |  |
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 | 160,996 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 160,996 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 160,996 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 160,996 |  |  |
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 | 2,384,578 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 8,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 54,914,024 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 63,414,024 |  |  |
Accumulated Depreciation | (24,082,672) |  |  |
Investment in Real Estate, Net | 39,331,352 |  |  |
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 | 9,551,107 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 75,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 112,256,508 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 188,056,508 |  |  |
Accumulated Depreciation | (30,064,769) |  |  |
Investment in Real Estate, Net | 157,991,739 |  |  |
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 | 4,743,836 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 4,000,159 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 99,034,426 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 103,034,585 |  |  |
Accumulated Depreciation | (49,673,731) |  |  |
Investment in Real Estate, Net | 53,360,854 |  |  |
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 | 5,764,419 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 9,360,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,542,972 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,902,972 |  |  |
Accumulated Depreciation | (15,274,806) |  |  |
Investment in Real Estate, Net | 20,628,166 |  |  |
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 | 14,751,585 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 38,607,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 92,223,802 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 130,830,802 |  |  |
Accumulated Depreciation | (36,348,320) |  |  |
Investment in Real Estate, Net | 94,482,482 |  |  |
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 | 11,428,402 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,524,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,120,107 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 31,644,107 |  |  |
Accumulated Depreciation | (19,830,954) |  |  |
Investment in Real Estate, Net | 11,813,153 |  |  |
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 | 10,707,930 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 3,390,700 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 41,225,204 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 44,615,904 |  |  |
Accumulated Depreciation | (31,925,485) |  |  |
Investment in Real Estate, Net | 12,690,419 |  |  |
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 | 6,184,215 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 23,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 67,204,653 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 90,604,653 |  |  |
Accumulated Depreciation | (36,500,570) |  |  |
Investment in Real Estate, Net | 54,104,083 |  |  |
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 | 4,071,719 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 15,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 39,546,055 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 54,946,055 |  |  |
Accumulated Depreciation | (10,060,766) |  |  |
Investment in Real Estate, Net | 44,885,289 |  |  |
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 | 4,523,128 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,111,200 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 16,433,566 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 21,544,766 |  |  |
Accumulated Depreciation | (11,149,744) |  |  |
Investment in Real Estate, Net | 10,395,022 |  |  |
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 | 63,651,394 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 43,186 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 16,807,519 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 63,694,580 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 80,502,099 |  |  |
Accumulated Depreciation | (8,420,800) |  |  |
Investment in Real Estate, Net | 72,081,299 |  |  |
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 | 802,966 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 7,740,467 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 44,949,147 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 52,689,614 |  |  |
Accumulated Depreciation | (6,895,004) |  |  |
Investment in Real Estate, Net | 45,794,610 |  |  |
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 | 138,212,568 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 10,366 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 30,224,393 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 138,222,934 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 168,447,327 |  |  |
Accumulated Depreciation | (10,939,933) |  |  |
Investment in Real Estate, Net | 157,507,394 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
One India Street (fka 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 | 3,346,235 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 22,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 32,019,214 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 54,219,214 |  |  |
Accumulated Depreciation | (8,203,480) |  |  |
Investment in Real Estate, Net | 46,015,734 |  |  |
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 | 1,796,632 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 32,250,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 112,546,632 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 144,796,632 |  |  |
Accumulated Depreciation | (27,949,911) |  |  |
Investment in Real Estate, Net | 116,846,721 |  |  |
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 | 691,363 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,911,041 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 20,646,322 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 26,557,363 |  |  |
Accumulated Depreciation | (3,017,526) |  |  |
Investment in Real Estate, Net | 23,539,837 |  |  |
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 | 6,345,232 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 40,504,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 24,370,911 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 64,874,911 |  |  |
Accumulated Depreciation | (13,224,242) |  |  |
Investment in Real Estate, Net | 51,650,669 |  |  |
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 | 7,488,875 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 37,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 17,344,472 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 54,944,472 |  |  |
Accumulated Depreciation | (11,104,877) |  |  |
Investment in Real Estate, Net | 43,839,595 |  |  |
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 | 9,179,112 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 52,654,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 32,224,863 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 84,878,863 |  |  |
Accumulated Depreciation | (18,199,716) |  |  |
Investment in Real Estate, Net | 66,679,147 |  |  |
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 | 10,892,394 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 102,163,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 119,881,796 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 222,044,796 |  |  |
Accumulated Depreciation | (52,426,236) |  |  |
Investment in Real Estate, Net | 169,618,560 |  |  |
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 | 65,073,509 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 212,580 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 16,667,059 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 65,286,089 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 81,953,148 |  |  |
Accumulated Depreciation | (9,333,810) |  |  |
Investment in Real Estate, Net | 72,619,338 |  |  |
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 | 2,436,695 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 28,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 81,274,879 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 109,574,879 |  |  |
Accumulated Depreciation | (20,074,236) |  |  |
Investment in Real Estate, Net | 89,500,643 |  |  |
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 | 1,663,394 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 13,700,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 60,750,913 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 74,450,913 |  |  |
Accumulated Depreciation | (14,438,751) |  |  |
Investment in Real Estate, Net | 60,012,162 |  |  |
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 | 4,858,184 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 43,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 133,611,543 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 176,811,543 |  |  |
Accumulated Depreciation | (34,884,871) |  |  |
Investment in Real Estate, Net | 141,926,672 |  |  |
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 | 11,262,203 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 3,033,500 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 38,564,586 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 41,598,086 |  |  |
Accumulated Depreciation | (29,343,622) |  |  |
Investment in Real Estate, Net | 12,254,464 |  |  |
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 | 7,163,451 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 6,246,700 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,990,904 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 25,237,604 |  |  |
Accumulated Depreciation | (12,327,804) |  |  |
Investment in Real Estate, Net | 12,909,800 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Pearl, The (WA) [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 | 999,509 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 6,972,585 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 27,526,924 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 34,499,509 |  |  |
Accumulated Depreciation | (3,981,489) |  |  |
Investment in Real Estate, Net | 30,518,020 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Pearl MDR (fka 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 | 4,778,318 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 125,573,677 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 125,573,677 |  |  |
Accumulated Depreciation | (33,800,305) |  |  |
Investment in Real Estate, Net | 91,773,372 |  |  |
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 | 6,080,345 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 18,094,052 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 87,986,293 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 106,080,345 |  |  |
Accumulated Depreciation | (29,282,736) |  |  |
Investment in Real Estate, Net | 76,797,609 |  |  |
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 | 23,015,281 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 35,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 56,489,103 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 91,589,103 |  |  |
Accumulated Depreciation | (28,347,617) |  |  |
Investment in Real Estate, Net | 63,241,486 |  |  |
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 | 3,777,392 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 3,572,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,438,386 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 22,010,786 |  |  |
Accumulated Depreciation | (13,473,788) |  |  |
Investment in Real Estate, Net | 8,536,998 |  |  |
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 | 5,637,028 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 8,640,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 27,124,154 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,764,154 |  |  |
Accumulated Depreciation | (16,434,227) |  |  |
Investment in Real Estate, Net | 19,329,927 |  |  |
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 | 23,175,339 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 22,487,006 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 120,018,252 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 142,505,258 |  |  |
Accumulated Depreciation | (84,850,599) |  |  |
Investment in Real Estate, Net | 57,654,659 |  |  |
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 | 179,509,834 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 120,105 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 40,830,011 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 179,629,939 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 220,459,950 |  |  |
Accumulated Depreciation | (18,869,635) |  |  |
Investment in Real Estate, Net | 201,590,315 |  |  |
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 | 4,453,741 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 72,431,054 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 72,431,054 |  |  |
Accumulated Depreciation | (18,216,430) |  |  |
Investment in Real Estate, Net | 54,214,624 |  |  |
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 | 273 |  |  |
Initial Cost to Company, Land | $ 34,625,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 77,879,740 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,499,005 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 34,625,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 79,378,745 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 114,003,745 |  |  |
Accumulated Depreciation | (30,036,655) |  |  |
Investment in Real Estate, Net | 83,967,090 |  |  |
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 | 171,558,177 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 127,665 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 76,292,169 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 171,685,842 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 247,978,011 |  |  |
Accumulated Depreciation | (25,554,087) |  |  |
Investment in Real Estate, Net | 222,423,924 |  |  |
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 | 9,741,254 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 28,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 79,537,169 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 107,737,169 |  |  |
Accumulated Depreciation | (41,393,133) |  |  |
Investment in Real Estate, Net | 66,344,036 |  |  |
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 | 3,095,294 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 3,573,621 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,150,799 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 25,724,420 |  |  |
Accumulated Depreciation | (11,070,038) |  |  |
Investment in Real Estate, Net | 14,654,382 |  |  |
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 | 2,829,890 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 26,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 87,241,052 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 114,141,052 |  |  |
Accumulated Depreciation | (22,257,122) |  |  |
Investment in Real Estate, Net | 91,883,930 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Radius Uptown [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Denver, CO |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 372 |  |  |
Initial Cost to Company, Land | $ 13,644,960 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 121,899,032 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 93,774 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 13,644,960 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 121,992,806 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 135,637,766 |  |  |
Accumulated Depreciation | (3,902,658) |  |  |
Investment in Real Estate, Net | 131,735,108 |  |  |
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 | 1,306,822 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 15,546,376 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 66,626,832 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 82,173,208 |  |  |
Accumulated Depreciation | (18,309,824) |  |  |
Investment in Real Estate, Net | 63,863,384 |  |  |
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 | 1,106,972 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 10,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 34,595,717 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 44,895,717 |  |  |
Accumulated Depreciation | (9,833,862) |  |  |
Investment in Real Estate, Net | 35,061,855 |  |  |
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 | 6,506,417 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 1,857,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 23,219,671 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 25,077,071 |  |  |
Accumulated Depreciation | (18,325,451) |  |  |
Investment in Real Estate, Net | 6,751,620 |  |  |
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 | 200,843 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 2,458,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 4,742,843 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 7,200,843 |  |  |
Accumulated Depreciation | (2,002,770) |  |  |
Investment in Real Estate, Net | 5,198,073 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 4,759,258 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 10,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 57,572,193 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 68,072,193 |  |  |
Accumulated Depreciation | (30,673,683) |  |  |
Investment in Real Estate, Net | 37,398,510 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 4,515,799 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 6,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 39,100,859 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 45,600,859 |  |  |
Accumulated Depreciation | (20,712,491) |  |  |
Investment in Real Estate, Net | 24,888,368 |  |  |
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 | 3,320,031 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 16,345,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 76,400,701 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 92,745,701 |  |  |
Accumulated Depreciation | (36,394,123) |  |  |
Investment in Real Estate, Net | 56,351,578 |  |  |
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 | 7,621,478 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 27,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 40,651,083 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 67,651,083 |  |  |
Accumulated Depreciation | (10,869,571) |  |  |
Investment in Real Estate, Net | 56,781,512 |  |  |
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 | 15,256,457 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 11,918,917 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 84,119,098 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 96,038,015 |  |  |
Accumulated Depreciation | (42,003,388) |  |  |
Investment in Real Estate, Net | 54,034,627 |  |  |
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 | 5,623,360 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 16,768,705 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 83,134,883 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 99,903,588 |  |  |
Accumulated Depreciation | (33,572,969) |  |  |
Investment in Real Estate, Net | 66,330,619 |  |  |
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 | 109,259,858 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 353,398 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 17,859,785 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 109,613,256 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 127,473,041 |  |  |
Accumulated Depreciation | (22,357,191) |  |  |
Investment in Real Estate, Net | 105,115,850 |  |  |
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 | 40,449,028 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 60,085 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 12,118,248 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 40,509,113 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 52,627,361 |  |  |
Accumulated Depreciation | (5,850,705) |  |  |
Investment in Real Estate, Net | 46,776,656 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Rianna I & 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 | 156 |  |  |
Initial Cost to Company, Land | $ 4,430,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 29,298,096 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,133,335 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 4,430,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 30,431,431 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 34,861,431 |  |  |
Accumulated Depreciation | (11,522,763) |  |  |
Investment in Real Estate, Net | 23,338,668 |  |  |
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 | 5,830,811 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 11,809,500 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 39,834,859 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 51,644,359 |  |  |
Accumulated Depreciation | (26,215,341) |  |  |
Investment in Real Estate, Net | 25,429,018 |  |  |
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 | 4,579,233 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 34,963,355 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 89,166,891 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 124,130,246 |  |  |
Accumulated Depreciation | (23,808,487) |  |  |
Investment in Real Estate, Net | 100,321,759 |  |  |
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 | 2,273,237 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 17,136,645 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 42,809,768 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 59,946,413 |  |  |
Accumulated Depreciation | (10,623,659) |  |  |
Investment in Real Estate, Net | 49,322,754 |  |  |
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 | 3,905,450 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 14,355,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 84,799,499 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 99,154,499 |  |  |
Accumulated Depreciation | (24,557,962) |  |  |
Investment in Real Estate, Net | 74,596,537 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Rivington, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Hoboken, NJ |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 240 |  |  |
Initial Cost to Company, Land | $ 34,340,640 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 112,110,289 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 524,731 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 34,340,640 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 112,635,020 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 146,975,660 |  |  |
Accumulated Depreciation | (6,937,992) |  |  |
Investment in Real Estate, Net | 140,037,668 |  |  |
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 | 1,342,588 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 4,922,840 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,544,748 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 36,467,588 |  |  |
Accumulated Depreciation | (10,069,250) |  |  |
Investment in Real Estate, Net | 26,398,338 |  |  |
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 | 1,440,822 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 14,641,990 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 44,298,832 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 58,940,822 |  |  |
Accumulated Depreciation | (14,646,231) |  |  |
Investment in Real Estate, Net | 44,294,591 |  |  |
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 | 4,466,962 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 663,800 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 10,441,765 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 11,105,565 |  |  |
Accumulated Depreciation | (7,764,932) |  |  |
Investment in Real Estate, Net | 3,340,633 |  |  |
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 | 15,840,921 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 3,342,381 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 47,178,253 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 50,520,634 |  |  |
Accumulated Depreciation | (37,713,141) |  |  |
Investment in Real Estate, Net | 12,807,493 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 7,343,477 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 8,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,426,501 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 40,326,501 |  |  |
Accumulated Depreciation | (21,400,131) |  |  |
Investment in Real Estate, Net | 18,926,370 |  |  |
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 | 5,774,667 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 10,560,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,349,124 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 41,909,124 |  |  |
Accumulated Depreciation | (18,371,799) |  |  |
Investment in Real Estate, Net | 23,537,325 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Skyhouse Denver [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Denver, CO |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 354 |  |  |
Initial Cost to Company, Land | $ 13,562,331 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 126,360,129 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 98,231 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 13,562,331 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 126,458,360 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 140,020,691 |  |  |
Accumulated Depreciation | (3,622,426) |  |  |
Investment in Real Estate, Net | 136,398,265 |  |  |
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 | 5,618,577 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 1,781,600 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,350,493 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 24,132,093 |  |  |
Accumulated Depreciation | (14,414,952) |  |  |
Investment in Real Estate, Net | 9,717,141 |  |  |
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 | 8,156,471 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 16,836,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 43,570,471 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 60,406,471 |  |  |
Accumulated Depreciation | (15,013,850) |  |  |
Investment in Real Estate, Net | 45,392,621 |  |  |
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 | 45,016,303 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 78,278,200 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 136,501,894 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 214,780,094 |  |  |
Accumulated Depreciation | (77,594,870) |  |  |
Investment in Real Estate, Net | 137,185,224 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 5,500,993 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 3,380,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 27,453,856 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 30,833,856 |  |  |
Accumulated Depreciation | (17,769,582) |  |  |
Investment in Real Estate, Net | 13,064,274 |  |  |
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 | 5,741,605 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 29,406,606 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 5,741,605 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,148,211 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 35,148,211 |  |  |
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 | 6,018,250 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 7,503,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 30,066,757 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 37,570,157 |  |  |
Accumulated Depreciation | (19,961,454) |  |  |
Investment in Real Estate, Net | 17,608,703 |  |  |
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 | 368 |  |  |
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 | 4,611,766 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 68,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 84,088,627 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 152,988,627 |  |  |
Accumulated Depreciation | (21,524,365) |  |  |
Investment in Real Estate, Net | 131,464,262 |  |  |
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 | 6,760,016 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 6,936,600 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 21,084,085 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 28,020,685 |  |  |
Accumulated Depreciation | (12,852,392) |  |  |
Investment in Real Estate, Net | 15,168,293 |  |  |
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 | 1,145,000 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 18,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 1,145,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 19,345,000 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 19,345,000 |  |  |
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 | $ 9,163,667 |  |  |
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 | 390,699 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 9,163,667 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 48,301,680 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 57,465,347 |  |  |
Accumulated Depreciation | (4,533,798) |  |  |
Investment in Real Estate, Net | 52,931,549 |  |  |
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 12/31/2018, 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 | 9,140,862 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 26,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,575,886 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 63,575,886 |  |  |
Accumulated Depreciation | (11,439,522) |  |  |
Investment in Real Estate, Net | 52,136,364 |  |  |
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 | 337,851 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 59,219,724 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 59,219,724 |  |  |
Accumulated Depreciation | (14,245,570) |  |  |
Investment in Real Estate, Net | 44,974,154 |  |  |
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 | 1,758,321 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 14,087,610 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,072,472 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 32,160,082 |  |  |
Accumulated Depreciation | (6,415,798) |  |  |
Investment in Real Estate, Net | 25,744,284 |  |  |
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 | 7,870,443 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 26,767,171 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 226,693,171 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 253,460,342 |  |  |
Accumulated Depreciation | (78,218,773) |  |  |
Investment in Real Estate, Net | 175,241,569 |  |  |
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 | 756,472 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 7,030,766 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 29,762,234 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 36,793,000 |  |  |
Accumulated Depreciation | (6,893,992) |  |  |
Investment in Real Estate, Net | 29,899,008 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 20,588,732 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 39,410,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 71,394,804 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 110,804,804 |  |  |
Accumulated Depreciation | (40,974,164) |  |  |
Investment in Real Estate, Net | 69,830,640 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 8,490,378 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 24,360,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 94,669,092 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 119,029,092 |  |  |
Accumulated Depreciation | (44,377,201) |  |  |
Investment in Real Estate, Net | 74,651,891 |  |  |
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 | 4,433,417 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 15,568,464 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 59,463,024 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 75,031,488 |  |  |
Accumulated Depreciation | (21,151,199) |  |  |
Investment in Real Estate, Net | 53,880,289 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Troy 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 | 378 |  |  |
Initial Cost to Company, Land | $ 34,641,051 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 181,602,575 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 101,573 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 34,641,051 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 181,704,148 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 216,345,199 |  |  |
Accumulated Depreciation | (6,623,226) |  |  |
Investment in Real Estate, Net | 209,721,973 |  |  |
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 | 75,800,090 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,262,298 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 12,542,418 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 77,062,388 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 89,604,806 |  |  |
Accumulated Depreciation | (17,836,404) |  |  |
Investment in Real Estate, Net | 71,768,402 |  |  |
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 | 2,039,013 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 8,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 24,227,301 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 33,027,301 |  |  |
Accumulated Depreciation | (11,748,837) |  |  |
Investment in Real Estate, Net | 21,278,464 |  |  |
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 | 10,163,129 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 9,403,960 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 200,759,169 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 210,163,129 |  |  |
Accumulated Depreciation | (66,454,004) |  |  |
Investment in Real Estate, Net | 143,709,125 |  |  |
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 | 1,429,925 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 15,322,724 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 77,606,519 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 92,929,243 |  |  |
Accumulated Depreciation | (20,521,554) |  |  |
Investment in Real Estate, Net | 72,407,689 |  |  |
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 | 4,455,624 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,190,700 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 14,134,733 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 19,325,433 |  |  |
Accumulated Depreciation | (10,358,163) |  |  |
Investment in Real Estate, Net | 8,967,270 |  |  |
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 | 3,510,354 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 18,539,817 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 133,917,719 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 152,457,536 |  |  |
Accumulated Depreciation | (43,822,971) |  |  |
Investment in Real Estate, Net | 108,634,565 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 1,665,109 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 10,590,975 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 46,074,134 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 56,665,109 |  |  |
Accumulated Depreciation | (17,179,349) |  |  |
Investment in Real Estate, Net | 39,485,760 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 1,003,076 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 10,350,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 36,436,513 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 46,786,513 |  |  |
Accumulated Depreciation | (15,908,114) |  |  |
Investment in Real Estate, Net | 30,878,399 |  |  |
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 | 10,741,608 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 1,665,100 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 25,727,286 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 27,392,386 |  |  |
Accumulated Depreciation | (20,635,508) |  |  |
Investment in Real Estate, Net | 6,756,878 |  |  |
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 | 1,925,886 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 15,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 42,785,282 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 57,885,282 |  |  |
Accumulated Depreciation | (11,360,058) |  |  |
Investment in Real Estate, Net | 46,525,224 |  |  |
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 | 1,539,555 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 7,059,230 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 49,217,317 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 56,276,547 |  |  |
Accumulated Depreciation | (21,895,611) |  |  |
Investment in Real Estate, Net | 34,380,936 |  |  |
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 | 5,670,439 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 91,610,442 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 91,610,442 |  |  |
Accumulated Depreciation | (22,371,237) |  |  |
Investment in Real Estate, Net | 69,239,205 |  |  |
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 | 176,040,861 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 230,941 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 27,709,329 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 176,271,802 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 203,981,131 |  |  |
Accumulated Depreciation | (19,667,441) |  |  |
Investment in Real Estate, Net | 184,313,690 |  |  |
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 | 17,318,936 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 4,525,800 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 58,055,229 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 62,581,029 |  |  |
Accumulated Depreciation | (48,290,527) |  |  |
Investment in Real Estate, Net | 14,290,502 |  |  |
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 | 2,389,563 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 15,550,260 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 71,839,303 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 87,389,563 |  |  |
Accumulated Depreciation | (25,840,645) |  |  |
Investment in Real Estate, Net | 61,548,918 |  |  |
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 | 4,411,295 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 12,448,888 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 56,455,743 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 68,904,631 |  |  |
Accumulated Depreciation | (19,527,545) |  |  |
Investment in Real Estate, Net | 49,377,086 |  |  |
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 | 10,053,790 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 34,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 118,539,649 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 152,939,649 |  |  |
Accumulated Depreciation | (30,280,723) |  |  |
Investment in Real Estate, Net | 122,658,926 |  |  |
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 | 1,559,270 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 16,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 35,633,326 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 52,433,326 |  |  |
Accumulated Depreciation | (8,944,170) |  |  |
Investment in Real Estate, Net | 43,489,156 |  |  |
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 | 5,705,814 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 84,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 72,761,316 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 157,561,316 |  |  |
Accumulated Depreciation | (20,616,675) |  |  |
Investment in Real Estate, Net | 136,944,641 |  |  |
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 | 3,668,190 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 469,546 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 166,791,212 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 167,260,758 |  |  |
Accumulated Depreciation | (61,427,741) |  |  |
Investment in Real Estate, Net | 105,833,017 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
West End Tower (fka 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 | $ 10,424,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 38,294,331 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 10,424,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 38,294,331 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 48,718,331 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 48,718,331 |  |  |
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 | 884,695 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 10,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,019,902 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 55,619,902 |  |  |
Accumulated Depreciation | (11,209,736) |  |  |
Investment in Real Estate, Net | 44,410,166 |  |  |
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 | 4,398,852 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 64,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 65,542,111 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 130,442,111 |  |  |
Accumulated Depreciation | (16,741,081) |  |  |
Investment in Real Estate, Net | 113,701,030 |  |  |
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 | 3,066,088 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 34,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 60,028,718 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 94,228,718 |  |  |
Accumulated Depreciation | (14,822,757) |  |  |
Investment in Real Estate, Net | 79,405,961 |  |  |
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 | 1,111,261 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 3,060,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 6,650,132 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 9,710,132 |  |  |
Accumulated Depreciation | (3,887,667) |  |  |
Investment in Real Estate, Net | 5,822,465 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Westside Barry (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 | 648,119 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 1,530,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 3,671,642 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 5,201,642 |  |  |
Accumulated Depreciation | (2,196,161) |  |  |
Investment in Real Estate, Net | 3,005,481 |  |  |
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 | 736,265 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 1,785,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 3,969,519 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 5,754,519 |  |  |
Accumulated Depreciation | (2,392,392) |  |  |
Investment in Real Estate, Net | 3,362,127 |  |  |
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 | 660,089 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 1,955,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 4,201,524 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 6,156,524 |  |  |
Accumulated Depreciation | (2,501,347) |  |  |
Investment in Real Estate, Net | 3,655,177 |  |  |
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 | 1,003,468 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 3,060,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 6,542,858 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 9,602,858 |  |  |
Accumulated Depreciation | (3,890,635) |  |  |
Investment in Real Estate, Net | 5,712,223 |  |  |
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 | 2,720,073 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 9,605,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,703,458 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 32,308,458 |  |  |
Accumulated Depreciation | (13,177,962) |  |  |
Investment in Real Estate, Net | 19,130,496 |  |  |
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 | 12,358,198 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 2,662,900 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 36,343,695 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 39,006,595 |  |  |
Accumulated Depreciation | (27,568,039) |  |  |
Investment in Real Estate, Net | 11,438,556 |  |  |
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 | 9,340,814 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 9,729,900 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 32,350,582 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 42,080,482 |  |  |
Accumulated Depreciation | (23,075,720) |  |  |
Investment in Real Estate, Net | 19,004,762 |  |  |
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 | 117,010,784 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 117,010,784 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 117,010,784 |  |  |
Accumulated Depreciation | (96,891,265) |  |  |
Investment in Real Estate, Net | 20,119,519 |  |  |
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 | 10,278,996 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 10,278,996 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 10,278,996 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 10,278,996 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Other [Member] |  |  |  |
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 | 74,341 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 74,341 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 74,341 |  |  |
Accumulated Depreciation | (29,979) |  |  |
Investment in Real Estate, Net | 44,362 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Wholly Owned Unencumbered [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 62,862 |  |  |
Initial Cost to Company, Land | $ 4,900,861,387 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 15,320,429,009 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,387,840,336 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 4,900,861,387 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 16,708,269,345 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 21,609,130,732 |  |  |
Accumulated Depreciation | (5,400,484,879) |  |  |
Investment in Real Estate, Net | 16,208,645,853 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
1401 Joyce on Pentagon Row [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 | 5,209,262 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 9,780,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 94,877,427 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 104,657,427 |  |  |
Accumulated Depreciation | (34,814,020) |  |  |
Investment in Real Estate, Net | 69,843,407 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 57,384,106 |  |  |
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 | 6,617,637 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 13,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 81,888,816 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 94,888,816 |  |  |
Accumulated Depreciation | (20,177,043) |  |  |
Investment in Real Estate, Net | $ 74,711,773 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | 0 |  |  |
300 East 39th (fka 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 | 4,927,499 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 48,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 101,102,138 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 150,002,138 |  |  |
Accumulated Depreciation | (25,417,391) |  |  |
Investment in Real Estate, Net | 124,584,747 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 61,139,469 |  |  |
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 | 6,389,689 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 79,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 85,512,313 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 164,912,313 |  |  |
Accumulated Depreciation | (22,235,813) |  |  |
Investment in Real Estate, Net | $ 142,676,500 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | 0 |  |  |
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 | 3,606,786 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 12,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 38,001,558 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 50,601,558 |  |  |
Accumulated Depreciation | (9,639,353) |  |  |
Investment in Real Estate, Net | $ 40,962,205 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | 0 |  |  |
55 West Fifth I & II (fka Townhouse Plaza and Gardens) [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 | 13,082,237 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 21,041,710 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 85,013,560 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 106,055,270 |  |  |
Accumulated Depreciation | (25,342,170) |  |  |
Investment in Real Estate, Net | 80,713,100 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 25,456,082 |  |  |
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 | 2,551,093 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 59,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 158,412,698 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 218,312,698 |  |  |
Accumulated Depreciation | (38,237,590) |  |  |
Investment in Real Estate, Net | 180,075,108 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 78,599,339 |  |  |
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 | 7,292,188 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 3,252,993 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 29,037,783 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 32,290,776 |  |  |
Accumulated Depreciation | (18,665,226) |  |  |
Investment in Real Estate, Net | 13,625,550 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 119,684 |  |  |
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 | 8,913,532 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 25,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 32,506,726 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 57,506,726 |  |  |
Accumulated Depreciation | (19,215,717) |  |  |
Investment in Real Estate, Net | 38,291,009 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 19,985,389 |  |  |
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 | 1,103,680 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 11,379,497 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 50,464,183 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 61,843,680 |  |  |
Accumulated Depreciation | (9,767,220) |  |  |
Investment in Real Estate, Net | 52,076,460 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 27,756,919 |  |  |
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 | 1,670,956 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 7,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,208,315 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 29,208,315 |  |  |
Accumulated Depreciation | (12,312,121) |  |  |
Investment in Real Estate, Net | 16,896,194 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 22,766,586 |  |  |
Avenir Apartments [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 | 114,321,619 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,484,463 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 117,806,082 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 117,806,082 |  |  |
Accumulated Depreciation | (28,125,723) |  |  |
Investment in Real Estate, Net | 89,680,359 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 87,221,511 |  |  |
Bella Vista I, II, III Combined [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 | 8,186,190 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 31,682,754 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 129,281,976 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 160,964,730 |  |  |
Accumulated Depreciation | (58,472,749) |  |  |
Investment in Real Estate, Net | 102,491,981 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 57,966,537 |  |  |
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 | 673,901 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 4,377,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 16,696,011 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 21,073,011 |  |  |
Accumulated Depreciation | (7,235,667) |  |  |
Investment in Real Estate, Net | 13,837,344 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 8,100,556 |  |  |
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 | 2,208,011 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 12,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,735,390 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 58,335,390 |  |  |
Accumulated Depreciation | (11,663,122) |  |  |
Investment in Real Estate, Net | $ 46,672,268 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | 0 |  |  |
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 | 2,730,568 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 3,397,100 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 12,019,642 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 15,416,742 |  |  |
Accumulated Depreciation | (8,256,357) |  |  |
Investment in Real Estate, Net | 7,160,385 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 9,234,049 |  |  |
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 | 2,094,969 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 9,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 19,045,295 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 28,045,295 |  |  |
Accumulated Depreciation | (4,826,188) |  |  |
Investment in Real Estate, Net | $ 23,219,107 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | 0 |  |  |
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 | 4,858,254 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 18,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 71,250,668 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 89,550,668 |  |  |
Accumulated Depreciation | (17,799,363) |  |  |
Investment in Real Estate, Net | $ 71,751,305 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | 0 |  |  |
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 | 2,877,507 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 23,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 55,922,580 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 79,422,580 |  |  |
Accumulated Depreciation | (14,794,273) |  |  |
Investment in Real Estate, Net | $ 64,628,307 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | 0 |  |  |
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 | 1,657,294 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 125,417,098 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 125,417,098 |  |  |
Accumulated Depreciation | (32,083,921) |  |  |
Investment in Real Estate, Net | $ 93,333,177 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | 0 |  |  |
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 | 1,210,925 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 23,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 88,933,246 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 112,433,246 |  |  |
Accumulated Depreciation | (21,595,734) |  |  |
Investment in Real Estate, Net | $ 90,837,512 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | 0 |  |  |
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 | 8,602,359 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 6,510,200 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 48,292,479 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 54,802,679 |  |  |
Accumulated Depreciation | (34,338,783) |  |  |
Investment in Real Estate, Net | 20,463,896 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 31,348,151 |  |  |
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 | 880,966 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 7,817,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 27,343,738 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,160,738 |  |  |
Accumulated Depreciation | (11,703,908) |  |  |
Investment in Real Estate, Net | 23,456,830 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 15,772,690 |  |  |
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 | 3,179,209 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 35,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 111,947,407 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 147,147,407 |  |  |
Accumulated Depreciation | (25,978,612) |  |  |
Investment in Real Estate, Net | $ 121,168,795 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | 0 |  |  |
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 | 400,152 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 7,113,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,023,978 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 33,136,978 |  |  |
Accumulated Depreciation | (11,264,581) |  |  |
Investment in Real Estate, Net | 21,872,397 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 14,310,309 |  |  |
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 | 1,136,625 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 17,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 75,815,542 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 93,315,542 |  |  |
Accumulated Depreciation | (17,882,838) |  |  |
Investment in Real Estate, Net | 75,432,704 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 94,150,066 |  |  |
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 | 3,425,049 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 16,047,022 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 52,076,012 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 68,123,034 |  |  |
Accumulated Depreciation | (15,990,887) |  |  |
Investment in Real Estate, Net | 52,132,147 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 32,199,417 |  |  |
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 | 10,753,054 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 2,512,500 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 33,364,966 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,877,466 |  |  |
Accumulated Depreciation | (25,621,271) |  |  |
Investment in Real Estate, Net | 10,256,195 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 46,495,108 |  |  |
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 | 656,460 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 10,752,145 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 35,284,575 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 46,036,720 |  |  |
Accumulated Depreciation | (13,177,993) |  |  |
Investment in Real Estate, Net | 32,858,727 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 26,234,062 |  |  |
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 | 2,304,807 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 43,555,851 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 43,555,851 |  |  |
Accumulated Depreciation | (18,264,493) |  |  |
Investment in Real Estate, Net | 25,291,358 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 24,997,955 |  |  |
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 | 6,765,782 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,977,504 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 33,514,893 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 39,492,397 |  |  |
Accumulated Depreciation | (18,532,044) |  |  |
Investment in Real Estate, Net | 20,960,353 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 24,966,238 |  |  |
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 | 14,775,239 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 12,858,693 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 71,943,742 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 84,802,435 |  |  |
Accumulated Depreciation | (36,507,386) |  |  |
Investment in Real Estate, Net | 48,295,049 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 69,282,256 |  |  |
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 | 1,379,251 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 12,649,228 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 38,221,263 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 50,870,491 |  |  |
Accumulated Depreciation | (13,657,076) |  |  |
Investment in Real Estate, Net | $ 37,213,415 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | 0 |  |  |
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 | 9,447,968 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 14,752,034 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 82,783,393 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 97,535,427 |  |  |
Accumulated Depreciation | (43,130,107) |  |  |
Investment in Real Estate, Net | 54,405,320 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 49,823,673 |  |  |
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 | 13,040,037 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 71,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 224,947,178 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 296,847,178 |  |  |
Accumulated Depreciation | (56,244,011) |  |  |
Investment in Real Estate, Net | $ 240,603,167 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | 0 |  |  |
Reserve at Fairfax Corner [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 | 11,739,962 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 15,804,057 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 74,869,013 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 90,673,070 |  |  |
Accumulated Depreciation | (41,689,916) |  |  |
Investment in Real Estate, Net | 48,983,154 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 84,717,832 |  |  |
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 | 12,766,992 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 79,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 190,083,969 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 269,983,969 |  |  |
Accumulated Depreciation | (45,375,257) |  |  |
Investment in Real Estate, Net | $ 224,608,712 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | 0 |  |  |
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 | 74,562 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 7,222,544 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,352,018 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 33,574,562 |  |  |
Accumulated Depreciation | (5,408,769) |  |  |
Investment in Real Estate, Net | $ 28,165,793 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | 0 |  |  |
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 | 8,181,014 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 2,629,804 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,851,903 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 34,481,707 |  |  |
Accumulated Depreciation | (23,765,883) |  |  |
Investment in Real Estate, Net | 10,715,824 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 38,020,343 |  |  |
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 | 6,795,448 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 28,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 68,712,118 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 97,312,118 |  |  |
Accumulated Depreciation | (31,806,076) |  |  |
Investment in Real Estate, Net | 65,506,042 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 37,940,000 |  |  |
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 | 199,965 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 2,736,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 8,009,992 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 10,745,992 |  |  |
Accumulated Depreciation | (3,570,951) |  |  |
Investment in Real Estate, Net | 7,175,041 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 4,874,236 |  |  |
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 | 1,203,271 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 42,580,326 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 57,217,945 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 99,798,271 |  |  |
Accumulated Depreciation | (10,415,693) |  |  |
Investment in Real Estate, Net | 89,382,578 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 40,501,067 |  |  |
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 | 7,510,844 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 12,650,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 41,167,136 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 53,817,136 |  |  |
Accumulated Depreciation | (22,859,119) |  |  |
Investment in Real Estate, Net | 30,958,017 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 30,357,682 |  |  |
Vintage at 425 Broadway (fka Promenade) [Memebr] |  |  |  |
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 | 1,763,696 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 9,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 15,725,219 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 24,725,219 |  |  |
Accumulated Depreciation | (4,182,605) |  |  |
Investment in Real Estate, Net | $ 20,542,614 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | 0 |  |  |
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 | 3,801,228 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 60,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 51,995,065 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 112,895,065 |  |  |
Accumulated Depreciation | (14,869,327) |  |  |
Investment in Real Estate, Net | 98,025,738 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 48,175,896 |  |  |
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 | 133,467,158 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,575,071 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 22,898,848 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 136,042,229 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 158,941,077 |  |  |
Accumulated Depreciation | (37,281,584) |  |  |
Investment in Real Estate, Net | 121,659,493 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 96,386,296 |  |  |
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 | 5,181,298 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 8,550,600 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,169,481 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 30,720,081 |  |  |
Accumulated Depreciation | (15,240,849) |  |  |
Investment in Real Estate, Net | 15,479,232 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 17,835,169 |  |  |
Portfolio/Entity Encumbrances [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
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 | 0 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
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 | 0 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate, Net | 0 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 797,768,476 |  |  |
Investment in Real Estate - Wholly Owned Encumbered [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 12,140 |  |  |
Initial Cost to Company, Land | $ 932,672,559 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 2,860,557,660 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 229,886,950 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 932,672,559 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 3,090,444,610 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 4,023,117,169 |  |  |
Accumulated Depreciation | (1,039,436,780) |  |  |
Investment in Real Estate, Net | 2,983,680,389 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 2,081,887,149 |  |  |
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 | 6,928,668 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 796,800 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 14,102,393 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 14,899,193 |  |  |
Accumulated Depreciation | (11,358,634) |  |  |
Investment in Real Estate, Net | 3,540,559 |  |  |
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 | 4,016,206 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 4,869,448 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 15,971,270 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 20,840,718 |  |  |
Accumulated Depreciation | (11,185,103) |  |  |
Investment in Real Estate, Net | 9,655,615 |  |  |
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 | 6,941,477 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 6,105,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 36,503,342 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 42,608,342 |  |  |
Accumulated Depreciation | (21,079,355) |  |  |
Investment in Real Estate, Net | 21,528,987 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Harrison Square (fka Elliot Bay) [Member] |  |  |  |
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 | 5,487,099 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 7,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 41,331,444 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 48,931,444 |  |  |
Accumulated Depreciation | (11,150,395) |  |  |
Investment in Real Estate, Net | 37,781,049 |  |  |
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 | 224,059 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 32,494,154 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 84,869,261 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 117,363,415 |  |  |
Accumulated Depreciation | (8,194,532) |  |  |
Investment in Real Estate, Net | 109,168,883 |  |  |
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 | 3,822,519 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,460,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 19,544,089 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 25,004,089 |  |  |
Accumulated Depreciation | (13,068,617) |  |  |
Investment in Real Estate, Net | 11,935,472 |  |  |
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 | 966,107 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 4,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 13,934,109 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 18,334,109 |  |  |
Accumulated Depreciation | (6,624,197) |  |  |
Investment in Real Estate, Net | 11,709,912 |  |  |
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 | 151,652,048 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 160,761 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 26,626,498 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 151,812,809 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 178,439,307 |  |  |
Accumulated Depreciation | (10,307,620) |  |  |
Investment in Real Estate, Net | 168,131,687 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Wood Creek II (fka Willow Brook (CA)) [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 | 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 | 6,854,946 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,055,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,243,618 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 50,298,618 |  |  |
Accumulated Depreciation | (23,768,126) |  |  |
Investment in Real Estate, Net | 26,530,492 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Partially Owned Unencumbered [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 1,847 |  |  |
Initial Cost to Company, Land | $ 93,406,900 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 387,910,493 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 35,401,842 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 93,406,900 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 423,312,335 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 516,719,235 |  |  |
Accumulated Depreciation | (116,736,579) |  |  |
Investment in Real Estate, Net | 399,982,656 |  |  |
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 | 5,634,209 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 4,507,100 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,209,023 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 22,716,123 |  |  |
Accumulated Depreciation | (13,322,710) |  |  |
Investment in Real Estate, Net | 9,393,413 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 16,515,951 |  |  |
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 | 18,812,121 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 7,726,619 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,425,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,538,740 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 31,963,740 |  |  |
Accumulated Depreciation | (17,263,363) |  |  |
Investment in Real Estate, Net | 14,700,377 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 28,150,731 |  |  |
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 | 6,896,605 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 6,945,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 29,961,581 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 36,906,581 |  |  |
Accumulated Depreciation | (18,556,525) |  |  |
Investment in Real Estate, Net | 18,350,056 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 36,425,025 |  |  |
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 | 5,636,468 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,345,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,027,086 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 31,372,086 |  |  |
Accumulated Depreciation | (16,017,984) |  |  |
Investment in Real Estate, Net | 15,354,102 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 28,839,869 |  |  |
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 | 5,074,751 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 4,550,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 23,139,515 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 27,689,515 |  |  |
Accumulated Depreciation | (14,268,541) |  |  |
Investment in Real Estate, Net | 13,420,974 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 26,144,881 |  |  |
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 | 3,347,614 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 3,057,100 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 11,196,232 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 14,253,332 |  |  |
Accumulated Depreciation | (7,873,885) |  |  |
Investment in Real Estate, Net | 6,379,447 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 9,819,750 |  |  |
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 | 3,070,140 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,286,753 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 23,786,753 |  |  |
Accumulated Depreciation | (9,309,905) |  |  |
Investment in Real Estate, Net | 14,476,848 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 9,885,805 |  |  |
Wisconsin Place [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 | 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 | 1,277,053 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 173,366,408 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 173,366,408 |  |  |
Accumulated Depreciation | (43,009,588) |  |  |
Investment in Real Estate, Net | 130,356,820 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 147,801,323 |  |  |
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 | 288,061,879 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 38,663,459 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 35,329,200 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 326,725,338 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 362,054,538 |  |  |
Accumulated Depreciation | (139,622,501) |  |  |
Investment in Real Estate, Net | 222,432,037 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 303,583,335 |  |  |
Total Consolidated Investment in Real Estate [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Units | ApartmentUnit | 78,537 |  |  |
Initial Cost to Company, Land | $ 5,962,270,046 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 18,856,959,041 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,691,792,587 |  |  |
Gross Amount Carried at close of period 12/31/2018, Land | 5,962,270,046 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 20,548,751,628 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 26,511,021,674 |  |  |
Accumulated Depreciation | (6,696,280,739) |  |  |
Investment in Real Estate, Net | 19,814,740,935 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 2,385,470,484 |  |  |

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