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Real Estate and Accumulated Depreciation (Details) | 12 Months Ended |  |  |
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Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Furniture, fixtures and equipment | $ 1,346,300,000 | $ 1,207,098,000 |  |
Land And Depreciable Property Net | 15,800,000,000 | 17,000,000,000 |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Accumulated Depreciation | $ (5,360,389,000) | $ (6,084,616,000) | $ (5,432,805,000) | $ (4,807,709,000)
Partially Owned Properties | 302 |  |  |
Apartment Units | 77,458 |  |  |
100 K Street [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | 0 |  |  |
Initial Cost to Company, Land | $ 15,600,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 10,782,320 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 15,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 10,782,320 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 26,382,320 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 26,382,320 |  |  |
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 | 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 | 6,750,405 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 103,539,100 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 100,833,130 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 204,372,230 |  |  |
Accumulated Depreciation | (41,010,422) |  |  |
Investment in Real Estate Net | 163,361,808 |  |  |
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 | 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 | 12,780,175 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 139,933,500 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 203,744,920 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 343,678,420 |  |  |
Accumulated Depreciation | (81,836,307) |  |  |
Investment in Real Estate Net | 261,842,113 |  |  |
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 | 236 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 111,872,438 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 60,750 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 111,933,188 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 111,933,188 |  |  |
Accumulated Depreciation | (7,014,736) |  |  |
Investment in Real Estate Net | 104,918,452 |  |  |
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 | 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 | 1,396,338 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 22,037,831 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 55,358,507 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 77,396,338 |  |  |
Accumulated Depreciation | (12,584,288) |  |  |
Investment in Real Estate Net | 64,812,050 |  |  |
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 | 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 | 2,910,862 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 32,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 95,586,090 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 127,986,090 |  |  |
Accumulated Depreciation | (16,638,099) |  |  |
Investment in Real Estate Net | 111,347,991 |  |  |
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 | 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 | 11,344,206 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 144,968,250 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 149,690,887 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 294,659,137 |  |  |
Accumulated Depreciation | (61,661,842) |  |  |
Investment in Real Estate Net | 232,997,295 |  |  |
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 | 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 | 101,850 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 18,937,702 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 94,860,529 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 113,798,231 |  |  |
Accumulated Depreciation | (12,803,962) |  |  |
Investment in Real Estate Net | 100,994,269 |  |  |
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 | 144 |  |  |
Initial Cost to Company, Land | $ 9,213,513 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 36,559,189 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,112,056 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 9,213,513 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 38,671,245 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 47,884,758 |  |  |
Accumulated Depreciation | (15,416,324) |  |  |
Investment in Real Estate Net | 32,468,434 |  |  |
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 | 0 |  |  |
Initial Cost to Company, Land | $ 10,401,958 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 4,932,954 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 10,401,958 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 4,932,954 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 15,334,912 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 15,334,912 |  |  |
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 | 556 |  |  |
Initial Cost to Company, Land | $ 54,638,298 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 40,361,702 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 14,505,801 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 54,638,298 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 54,867,503 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 109,505,801 |  |  |
Accumulated Depreciation | (21,697,139) |  |  |
Investment in Real Estate Net | 87,808,662 |  |  |
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 | 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 | 2,999,587 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 31,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 112,005,321 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 143,405,321 |  |  |
Accumulated Depreciation | (19,795,492) |  |  |
Investment in Real Estate Net | 123,609,829 |  |  |
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 | 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 | 2,103,036 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 11,321,198 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 51,777,211 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 63,098,409 |  |  |
Accumulated Depreciation | (9,394,581) |  |  |
Investment in Real Estate Net | 53,703,828 |  |  |
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 | 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 | 2,390,730 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 21,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 81,115,393 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 103,015,393 |  |  |
Accumulated Depreciation | (13,936,506) |  |  |
Investment in Real Estate Net | 89,078,887 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
M St 2400 [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 4,082,076 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 30,006,593 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 118,095,861 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 148,102,454 |  |  |
Accumulated Depreciation | (45,418,266) |  |  |
Investment in Real Estate Net | 102,684,188 |  |  |
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 | 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 | 517,562 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 14,450,070 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 116,342,492 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 130,792,562 |  |  |
Accumulated Depreciation | (10,319,919) |  |  |
Investment in Real Estate Net | 120,472,643 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
340 Fremont [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Francisco, CA |  |  |
Real Estate And Accumulated Depreciation Units | 348 |  |  |
Initial Cost to Company, Land | $ 42,000,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 244,995,446 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 88 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 42,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 244,995,534 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 286,995,534 |  |  |
Accumulated Depreciation | (4,611,169) |  |  |
Investment in Real Estate Net | 282,384,365 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
3003 Van Ness [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 4,018,369 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 56,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 145,209,949 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 201,509,949 |  |  |
Accumulated Depreciation | (27,557,126) |  |  |
Investment in Real Estate Net | 173,952,823 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
45 Worthington [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Boston, MA |  |  |
Real Estate And Accumulated Depreciation Units | 0 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 2,058,673 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 2,058,673 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 2,058,673 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 2,058,673 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
420 East 80th Street [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | 155 |  |  |
Initial Cost to Company, Land | $ 39,277,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 23,026,984 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,252,598 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 39,277,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 27,279,582 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 66,556,582 |  |  |
Accumulated Depreciation | (12,559,376) |  |  |
Investment in Real Estate Net | 53,997,206 |  |  |
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 | 559 |  |  |
Initial Cost to Company, Land | $ 28,150,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 138,600,000 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,740,413 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 28,150,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 142,340,413 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 170,490,413 |  |  |
Accumulated Depreciation | (39,542,039) |  |  |
Investment in Real Estate Net | 130,948,374 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
455 I Street [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Washington, D.C. |  |  |
Real Estate And Accumulated Depreciation Units | 0 |  |  |
Initial Cost to Company, Land | $ 12,762,857 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 45,794,997 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 12,762,857 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,794,997 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 58,557,854 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 58,557,854 |  |  |
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 | 0 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 1,237,673 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 1,237,673 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 1,237,673 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 1,237,673 |  |  |
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 | 0 |  |  |
Initial Cost to Company, Land | $ 13,131,456 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 11,144,682 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 13,131,456 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 11,144,682 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 24,276,138 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 24,276,138 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
660 Washington [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 734,411 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 32,852,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 43,874,962 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 76,726,962 |  |  |
Accumulated Depreciation | (17,905,409) |  |  |
Investment in Real Estate Net | 58,821,553 |  |  |
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 | Boston, MA |  |  |
Real Estate And Accumulated Depreciation Units | 420 |  |  |
Initial Cost to Company, Land | $ 106,100,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 166,311,679 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,325,428 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 106,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 168,637,107 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 274,737,107 |  |  |
Accumulated Depreciation | (29,635,573) |  |  |
Investment in Real Estate Net | 245,101,534 |  |  |
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 | 480 |  |  |
Initial Cost to Company, Land | $ 28,108,899 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 236,763,553 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,103,051 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 28,108,899 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 237,866,604 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 265,975,503 |  |  |
Accumulated Depreciation | (57,907,087) |  |  |
Investment in Real Estate Net | 208,068,416 |  |  |
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 | 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 | 12,799,538 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 22,611,600 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 90,291,709 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 112,903,309 |  |  |
Accumulated Depreciation | (39,723,414) |  |  |
Investment in Real Estate Net | 73,179,895 |  |  |
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 | 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 | 264,502 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,249,124 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,874,378 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 24,123,502 |  |  |
Accumulated Depreciation | (4,400,965) |  |  |
Investment in Real Estate Net | 19,722,537 |  |  |
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 | 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 | 5,319,200 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 27,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 174,311,640 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 202,211,640 |  |  |
Accumulated Depreciation | (28,587,488) |  |  |
Investment in Real Estate Net | 173,624,152 |  |  |
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 | 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 | 1,975,718 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 65,352,706 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 67,723,012 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 133,075,718 |  |  |
Accumulated Depreciation | (24,056,905) |  |  |
Investment in Real Estate Net | 109,018,813 |  |  |
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 | 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 | 1,965,143 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 7,786,800 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 33,552,468 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 41,339,268 |  |  |
Accumulated Depreciation | (7,400,305) |  |  |
Investment in Real Estate Net | 33,938,963 |  |  |
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 | 0 |  |  |
Initial Cost to Company, Land | $ 41,363,921 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 166,903,627 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 41,363,921 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 166,903,627 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 208,267,548 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 208,267,548 |  |  |
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 | 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 | 199,531 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,550,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 15,985,040 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 21,535,040 |  |  |
Accumulated Depreciation | (6,078,896) |  |  |
Investment in Real Estate Net | 15,456,144 |  |  |
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 | 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 | 1,712,897 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 18,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 91,507,098 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 110,407,098 |  |  |
Accumulated Depreciation | (15,639,767) |  |  |
Investment in Real Estate Net | 94,767,331 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Altitude [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | 545 |  |  |
Initial Cost to Company, Land | $ 43,783,485 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 147,918,661 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 25,744 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 43,783,485 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 147,944,405 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 191,727,890 |  |  |
Accumulated Depreciation | (2,490,933) |  |  |
Investment in Real Estate Net | 189,236,957 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Alton, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Irvine, CA |  |  |
Real Estate And Accumulated Depreciation Units | 0 |  |  |
Initial Cost to Company, Land | $ 11,049,027 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 90,857,975 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 11,049,027 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 90,857,975 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 101,907,002 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 101,907,002 |  |  |
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 | 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 | 4,162,140 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 9,057,300 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,645,782 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 31,703,082 |  |  |
Accumulated Depreciation | (13,943,284) |  |  |
Investment in Real Estate Net | 17,759,798 |  |  |
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 | 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 | 329,292 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 1,642,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 9,481,810 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 11,123,810 |  |  |
Accumulated Depreciation | (3,371,389) |  |  |
Investment in Real Estate Net | 7,752,421 |  |  |
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 | 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 | 670,299 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 8,000,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 36,744,899 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 44,745,299 |  |  |
Accumulated Depreciation | (9,258,909) |  |  |
Investment in Real Estate Net | 35,486,390 |  |  |
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 | 261 |  |  |
Initial Cost to Company, Land | $ 12,300,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 61,466,267 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,277,634 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 12,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 63,743,901 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 76,043,901 |  |  |
Accumulated Depreciation | (12,191,117) |  |  |
Investment in Real Estate Net | 63,852,784 |  |  |
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 | 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 | 90,854 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 32,401,680 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 47,226,286 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 79,627,966 |  |  |
Accumulated Depreciation | (3,149,449) |  |  |
Investment in Real Estate Net | 76,478,517 |  |  |
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 | 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 | 1,749,322 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 7,995,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 19,754,322 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 27,749,322 |  |  |
Accumulated Depreciation | (5,134,751) |  |  |
Investment in Real Estate Net | 22,614,571 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Azure [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Francisco, CA |  |  |
Real Estate And Accumulated Depreciation Units | 273 |  |  |
Initial Cost to Company, Land | $ 32,855,115 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 152,254,155 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 26,494 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 32,855,115 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 152,280,649 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 185,135,764 |  |  |
Accumulated Depreciation | (7,791,579) |  |  |
Investment in Real Estate Net | 177,344,185 |  |  |
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 | 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 | 2,909,175 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 7,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 30,346,414 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 37,946,414 |  |  |
Accumulated Depreciation | (13,103,323) |  |  |
Investment in Real Estate Net | 24,843,091 |  |  |
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 | 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 | 1,000,140 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 114,351,405 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 166,648,735 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 281,000,140 |  |  |
Accumulated Depreciation | (35,148,328) |  |  |
Investment in Real Estate Net | 245,851,812 |  |  |
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 | 1 |  |  |
Initial Cost to Company, Land | $ 63,158 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 248,928 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | (5,320) |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 63,158 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 243,608 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 306,766 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 306,766 |  |  |
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 | 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 | 683,777 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 9,098,808 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 29,384,969 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 38,483,777 |  |  |
Accumulated Depreciation | (6,820,566) |  |  |
Investment in Real Estate Net | 31,663,211 |  |  |
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 | 224 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 73,189,262 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,050,136 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 74,239,398 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 74,239,398 |  |  |
Accumulated Depreciation | (14,067,543) |  |  |
Investment in Real Estate Net | 60,171,855 |  |  |
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 | 192 |  |  |
Initial Cost to Company, Land | $ 9,991,500 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 22,247,278 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,599,062 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 9,991,500 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 25,846,340 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,837,840 |  |  |
Accumulated Depreciation | (15,933,244) |  |  |
Investment in Real Estate Net | 19,904,596 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Bridford Lakes Two [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Greensboro, NC |  |  |
Real Estate And Accumulated Depreciation Units | 0 |  |  |
Initial Cost to Company, Land | $ 1,100,564 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 792,508 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 1,100,564 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 792,508 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 1,893,072 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 1,893,072 |  |  |
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 | 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 | 1,827,017 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 40,099,922 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 223,265,648 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 263,365,570 |  |  |
Accumulated Depreciation | (46,337,376) |  |  |
Investment in Real Estate Net | 217,028,194 |  |  |
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 | 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 | 7,841 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 17,125,766 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 28,082,075 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 45,207,841 |  |  |
Accumulated Depreciation | (978,707) |  |  |
Investment in Real Estate Net | 44,229,134 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Cambridge Park [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Cambridge, MA |  |  |
Real Estate And Accumulated Depreciation Units | 312 |  |  |
Initial Cost to Company, Land | $ 31,200,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 106,048,587 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,107,045 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 31,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 110,155,632 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 141,355,632 |  |  |
Accumulated Depreciation | (19,695,291) |  |  |
Investment in Real Estate Net | 121,660,341 |  |  |
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 | 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 | 7,872,672 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 10,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 59,240,585 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 69,240,585 |  |  |
Accumulated Depreciation | (28,386,923) |  |  |
Investment in Real Estate Net | 40,853,662 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Cascade [Domain] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | 0 |  |  |
Initial Cost to Company, Land | $ 23,751,564 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 99,710,750 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 23,751,564 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 99,710,750 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 123,462,314 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 123,462,314 |  |  |
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 | 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 | 10,056,055 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 9,700,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 80,136,433 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 89,836,433 |  |  |
Accumulated Depreciation | (33,705,547) |  |  |
Investment in Real Estate Net | 56,130,886 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Centre Club [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Ontario, CA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 7,413,964 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 7,436,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 40,428,753 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 47,864,753 |  |  |
Accumulated Depreciation | (21,574,006) |  |  |
Investment in Real Estate Net | 26,290,747 |  |  |
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 | 85 |  |  |
Initial Cost to Company, Land | $ 5,220,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 16,744,643 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,266,923 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,220,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 19,011,566 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 24,231,566 |  |  |
Accumulated Depreciation | (8,540,355) |  |  |
Investment in Real Estate Net | 15,691,211 |  |  |
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 | 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 | 5,626,705 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 40,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 101,563,751 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 141,963,751 |  |  |
Accumulated Depreciation | (17,548,498) |  |  |
Investment in Real Estate Net | 124,415,253 |  |  |
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 | 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 | 857,946 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 6,863,792 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,334,154 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 44,197,946 |  |  |
Accumulated Depreciation | (11,712,818) |  |  |
Investment in Real Estate Net | 32,485,128 |  |  |
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 | 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 | 3,126,524 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 15,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,002,781 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 60,102,781 |  |  |
Accumulated Depreciation | (7,953,824) |  |  |
Investment in Real Estate Net | 52,148,957 |  |  |
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 | 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 | 10,574,412 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 14,704,898 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 89,769,514 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 104,474,412 |  |  |
Accumulated Depreciation | (25,961,856) |  |  |
Investment in Real Estate Net | 78,512,556 |  |  |
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 | 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 | 2,143,113 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 30,400,340 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 105,967,773 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 136,368,113 |  |  |
Accumulated Depreciation | (26,624,877) |  |  |
Investment in Real Estate Net | 109,743,236 |  |  |
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 | 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 | 3,832,717 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 6,615,467 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,662,052 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 25,277,519 |  |  |
Accumulated Depreciation | (8,171,402) |  |  |
Investment in Real Estate Net | 17,106,117 |  |  |
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 | 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 | 4,856,602 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 27,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 118,858,897 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 146,458,897 |  |  |
Accumulated Depreciation | (20,124,977) |  |  |
Investment in Real Estate Net | 126,333,920 |  |  |
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 | 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 | 1,796,515 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 13,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 28,709,628 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 42,209,628 |  |  |
Accumulated Depreciation | (5,801,661) |  |  |
Investment in Real Estate Net | 36,407,967 |  |  |
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 | 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 | 4,635,703 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 92,021,727 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 92,021,727 |  |  |
Accumulated Depreciation | (17,966,254) |  |  |
Investment in Real Estate Net | 74,055,473 |  |  |
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 | 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 | 4,013,129 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 9,606,600 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 25,206,360 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 34,812,960 |  |  |
Accumulated Depreciation | (15,771,922) |  |  |
Investment in Real Estate Net | 19,041,038 |  |  |
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 | 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 | 3,914,279 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 32,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 89,033,603 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 121,333,603 |  |  |
Accumulated Depreciation | (15,979,321) |  |  |
Investment in Real Estate Net | 105,354,282 |  |  |
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 | 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 | 3,157,515 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 17,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 51,076,490 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 68,276,490 |  |  |
Accumulated Depreciation | (9,260,208) |  |  |
Investment in Real Estate Net | 59,016,282 |  |  |
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 | 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 | 8,800,432 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 1,808,900 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 25,074,793 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 26,883,693 |  |  |
Accumulated Depreciation | (17,314,590) |  |  |
Investment in Real Estate Net | 9,569,103 |  |  |
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 | 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 | 1,125,457 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 13,092,552 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,032,905 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 58,125,457 |  |  |
Accumulated Depreciation | (10,423,583) |  |  |
Investment in Real Estate Net | 47,701,874 |  |  |
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 | 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 | 415,204 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 14,080,560 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 56,834,644 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 70,915,204 |  |  |
Accumulated Depreciation | (7,584,216) |  |  |
Investment in Real Estate Net | 63,330,988 |  |  |
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 | 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 | 22,690,975 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 14,855,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 80,257,611 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 95,112,611 |  |  |
Accumulated Depreciation | (52,167,424) |  |  |
Investment in Real Estate Net | 42,945,187 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Encinitas Heights (fka Encinitas) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Encinitas, CA |  |  |
Real Estate And Accumulated Depreciation Units | 120 |  |  |
Initial Cost to Company, Land | $ 12,000,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 29,207,497 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 617,199 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 12,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 29,824,696 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 41,824,696 |  |  |
Accumulated Depreciation | (5,889,783) |  |  |
Investment in Real Estate Net | 35,934,913 |  |  |
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 | 174 |  |  |
Initial Cost to Company, Land | $ 8,700,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 25,446,003 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,211,820 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 8,700,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,657,823 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,357,823 |  |  |
Accumulated Depreciation | (7,869,084) |  |  |
Investment in Real Estate Net | 27,488,739 |  |  |
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 | 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 | 927,144 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 25,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 84,913,361 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 110,813,361 |  |  |
Accumulated Depreciation | (15,751,998) |  |  |
Investment in Real Estate Net | 95,061,363 |  |  |
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 | 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 | 2,733,097 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 25,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 81,486,211 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 107,286,211 |  |  |
Accumulated Depreciation | (14,742,488) |  |  |
Investment in Real Estate Net | 92,543,723 |  |  |
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 | 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 | 2,651,435 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 18,144,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 49,219,376 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 67,363,376 |  |  |
Accumulated Depreciation | (19,871,531) |  |  |
Investment in Real Estate Net | 47,491,845 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Garden Garage [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Boston, MA |  |  |
Real Estate And Accumulated Depreciation Units | 0 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 4,917,373 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 4,917,373 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 4,917,373 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 4,917,373 |  |  |
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 | 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 | 13,834,746 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 9,209,780 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 39,557,412 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 48,767,192 |  |  |
Accumulated Depreciation | (21,301,983) |  |  |
Investment in Real Estate Net | 27,465,209 |  |  |
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 | 164 |  |  |
Initial Cost to Company, Land | $ 1,722,400 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 15,471,429 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,477,710 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 1,722,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 19,949,139 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 21,671,539 |  |  |
Accumulated Depreciation | (12,574,169) |  |  |
Investment in Real Estate Net | 9,097,370 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Glen Meadow [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Franklin, MA |  |  |
Real Estate And Accumulated Depreciation Units | 288 |  |  |
Initial Cost to Company, Land | $ 2,339,331 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 16,133,588 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,347,422 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 2,339,331 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 20,481,010 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 22,820,341 |  |  |
Accumulated Depreciation | (12,813,162) |  |  |
Investment in Real Estate Net | 10,007,179 |  |  |
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 | 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 | 4,042,761 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 10,806,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 34,378,091 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 45,184,091 |  |  |
Accumulated Depreciation | (15,493,262) |  |  |
Investment in Real Estate Net | 29,690,829 |  |  |
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 | 758 |  |  |
Initial Cost to Company, Land | $ 59,387,158 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 158,829,432 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 20,957,019 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 59,387,158 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 179,786,451 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 239,173,609 |  |  |
Accumulated Depreciation | (73,216,856) |  |  |
Investment in Real Estate Net | 165,956,753 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Helios/1610 2nd Avenue [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | 0 |  |  |
Initial Cost to Company, Land | $ 18,061,674 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 162,443,822 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 18,061,674 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 162,443,822 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 180,505,496 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 180,505,496 |  |  |
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 | 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 | 1,839,852 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 10,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 33,648,187 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 44,448,187 |  |  |
Accumulated Depreciation | (14,133,220) |  |  |
Investment in Real Estate Net | 30,314,967 |  |  |
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 | 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 | 1,741,466 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 6,895,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 20,725,063 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 27,620,063 |  |  |
Accumulated Depreciation | (9,305,589) |  |  |
Investment in Real Estate Net | 18,314,474 |  |  |
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 | 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 | 323,337 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 23,299,892 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 103,023,445 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 126,323,337 |  |  |
Accumulated Depreciation | (13,208,612) |  |  |
Investment in Real Estate Net | 113,114,725 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Highlands at Cherry Hill [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Cherry Hills, NJ |  |  |
Real Estate And Accumulated Depreciation Units | 170 |  |  |
Initial Cost to Company, Land | $ 6,800,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 21,459,108 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,219,837 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 6,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,678,945 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 29,478,945 |  |  |
Accumulated Depreciation | (9,622,596) |  |  |
Investment in Real Estate Net | 19,856,349 |  |  |
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 | 252 |  |  |
Initial Cost to Company, Land | $ 10,080,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 37,526,912 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,671,208 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 10,080,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 39,198,120 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 49,278,120 |  |  |
Accumulated Depreciation | (15,870,459) |  |  |
Investment in Real Estate Net | 33,407,661 |  |  |
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 | 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 | 623,527 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 9,435,760 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 33,187,767 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 42,623,527 |  |  |
Accumulated Depreciation | (8,254,511) |  |  |
Investment in Real Estate Net | 34,369,016 |  |  |
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 | 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 | 2,182,860 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 23,420,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 72,160,559 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 95,580,559 |  |  |
Accumulated Depreciation | (30,934,660) |  |  |
Investment in Real Estate Net | 64,645,899 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Hudson Crossing Two [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | 0 |  |  |
Initial Cost to Company, Land | $ 10,599,287 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 3,293,787 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 10,599,287 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 3,293,787 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 13,893,074 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 13,893,074 |  |  |
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 | 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 | 4,844,133 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,350,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,958,207 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 51,308,207 |  |  |
Accumulated Depreciation | (20,241,451) |  |  |
Investment in Real Estate Net | 31,066,756 |  |  |
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 | 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 12/31/2016, 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 | 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 | 992,859 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 2,732,800 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 14,881,141 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 17,613,941 |  |  |
Accumulated Depreciation | (6,865,471) |  |  |
Investment in Real Estate Net | 10,748,470 |  |  |
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 | 280 |  |  |
Initial Cost to Company, Land | $ 14,791,831 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 76,417,368 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 160,373 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 14,791,831 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 76,577,741 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 91,369,572 |  |  |
Accumulated Depreciation | (11,450,392) |  |  |
Investment in Real Estate Net | 79,919,180 |  |  |
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 | 206 |  |  |
Initial Cost to Company, Land | $ 11,726,305 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 55,592,607 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 10,285 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 11,726,305 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 55,602,892 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 67,329,197 |  |  |
Accumulated Depreciation | (2,870,469) |  |  |
Investment in Real Estate Net | 64,458,728 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Kelvin, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Irvine, CA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 140,201 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 15,521,552 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 64,993,649 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 80,515,201 |  |  |
Accumulated Depreciation | (5,226,037) |  |  |
Investment in Real Estate Net | 75,289,164 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 0 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 2,361,587 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 2,361,587 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 2,361,587 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 2,361,587 |  |  |
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 | 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 | 8,727,114 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 27,246,045 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 46,468,164 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 73,714,209 |  |  |
Accumulated Depreciation | (27,123,316) |  |  |
Investment in Real Estate Net | 46,590,893 |  |  |
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 | 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 | 12,900,751 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,928,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 46,496,013 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 52,424,413 |  |  |
Accumulated Depreciation | (32,166,271) |  |  |
Investment in Real Estate Net | 20,258,142 |  |  |
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 | 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 | 927,140 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,805,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,632,140 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 32,437,140 |  |  |
Accumulated Depreciation | (7,515,112) |  |  |
Investment in Real Estate Net | 24,922,028 |  |  |
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 | 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 | 593,626 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 20,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 68,502,649 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 88,602,649 |  |  |
Accumulated Depreciation | (11,467,543) |  |  |
Investment in Real Estate Net | 77,135,106 |  |  |
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 | 186 |  |  |
Initial Cost to Company, Land | $ 23,300,000 |  |  |
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 | 4,430,000 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 23,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 82,875,657 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 106,175,657 |  |  |
Accumulated Depreciation | (14,293,167) |  |  |
Investment in Real Estate Net | 91,882,490 |  |  |
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 | 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 | 1,952,072 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 73,170,045 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 55,914,582 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 129,084,627 |  |  |
Accumulated Depreciation | (20,862,433) |  |  |
Investment in Real Estate Net | 108,222,194 |  |  |
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 | 710 |  |  |
Initial Cost to Company, Land | $ 47,096,917 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 150,143,916 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 77,175,848 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 47,096,917 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 227,319,764 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 274,416,681 |  |  |
Accumulated Depreciation | (140,185,560) |  |  |
Investment in Real Estate Net | 134,231,121 |  |  |
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 | 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 | 726,983 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 22,346,513 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 62,228,141 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 84,574,654 |  |  |
Accumulated Depreciation | (11,547,865) |  |  |
Investment in Real Estate Net | 73,026,789 |  |  |
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 | 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 | 5,590,178 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 174,432,620 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 174,432,620 |  |  |
Accumulated Depreciation | (34,075,934) |  |  |
Investment in Real Estate Net | 140,356,686 |  |  |
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 | 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 | 4,874,252 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 60,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 94,185,734 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 155,085,734 |  |  |
Accumulated Depreciation | (17,348,528) |  |  |
Investment in Real Estate Net | 137,737,206 |  |  |
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 | 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 | 419,390 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 8,125,216 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 27,798,174 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,923,390 |  |  |
Accumulated Depreciation | (5,879,972) |  |  |
Investment in Real Estate Net | 30,043,418 |  |  |
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 | 0 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 11,539 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 11,539 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 11,539 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 11,539 |  |  |
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 | 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 | 1,742,611 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 8,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 54,272,057 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 62,772,057 |  |  |
Accumulated Depreciation | (20,324,720) |  |  |
Investment in Real Estate Net | 42,447,337 |  |  |
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 | 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 | 5,632,060 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 75,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 108,337,461 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 184,137,461 |  |  |
Accumulated Depreciation | (21,534,636) |  |  |
Investment in Real Estate Net | 162,602,825 |  |  |
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 | 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 | 3,216,250 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 9,360,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 23,994,803 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 33,354,803 |  |  |
Accumulated Depreciation | (13,232,302) |  |  |
Investment in Real Estate Net | 20,122,501 |  |  |
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 | 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 | 12,538,178 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 38,607,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 90,010,395 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 128,617,395 |  |  |
Accumulated Depreciation | (29,143,721) |  |  |
Investment in Real Estate Net | 99,473,674 |  |  |
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 | 221 |  |  |
Initial Cost to Company, Land | $ 5,524,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 14,691,705 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 10,511,874 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,524,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 25,203,579 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 30,727,579 |  |  |
Accumulated Depreciation | (17,391,149) |  |  |
Investment in Real Estate Net | 13,336,430 |  |  |
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 | 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 | 9,746,651 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 3,390,700 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 40,263,925 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 43,654,625 |  |  |
Accumulated Depreciation | (28,656,591) |  |  |
Investment in Real Estate Net | 14,998,034 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Oakwood Boston [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Boston, MA |  |  |
Real Estate And Accumulated Depreciation Units | 94 |  |  |
Initial Cost to Company, Land | $ 22,200,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 28,672,979 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,529,010 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 22,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 30,201,989 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 52,401,989 |  |  |
Accumulated Depreciation | (5,884,677) |  |  |
Investment in Real Estate Net | 46,517,312 |  |  |
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 | 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 | 2,425,184 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 15,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,899,520 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 53,299,520 |  |  |
Accumulated Depreciation | (6,786,525) |  |  |
Investment in Real Estate Net | 46,512,995 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Oakwood Marina Del Rey [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Marina Del Rey, CA |  |  |
Real Estate And Accumulated Depreciation Units | 597 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 120,795,359 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,437,138 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 123,232,497 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 123,232,497 |  |  |
Accumulated Depreciation | (24,113,286) |  |  |
Investment in Real Estate Net | 99,119,211 |  |  |
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 | 520 |  |  |
Initial Cost to Company, Land | $ 23,400,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 61,020,438 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,042,217 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 23,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 66,062,655 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 89,462,655 |  |  |
Accumulated Depreciation | (31,804,000) |  |  |
Investment in Real Estate Net | 57,658,655 |  |  |
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 | 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 | 3,961,557 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,111,200 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 15,871,995 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 20,983,195 |  |  |
Accumulated Depreciation | (9,843,174) |  |  |
Investment in Real Estate Net | 11,140,021 |  |  |
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 | 301 |  |  |
Initial Cost to Company, Land | $ 16,807,519 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 63,703,105 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,853 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 16,807,519 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 63,707,958 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 80,515,477 |  |  |
Accumulated Depreciation | (3,220,384) |  |  |
Investment in Real Estate Net | 77,295,093 |  |  |
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 | 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 | 615,810 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 7,740,467 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 44,761,991 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 52,502,458 |  |  |
Accumulated Depreciation | (3,368,591) |  |  |
Investment in Real Estate Net | 49,133,867 |  |  |
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 | 241 |  |  |
Initial Cost to Company, Land | $ 30,224,393 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 132,422,943 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 30,224,393 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 132,422,943 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 162,647,336 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 162,647,336 |  |  |
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 | 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 | 1,114,418 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 32,250,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 111,864,418 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 144,114,418 |  |  |
Accumulated Depreciation | (18,609,682) |  |  |
Investment in Real Estate Net | 125,504,736 |  |  |
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 | 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 | 25,690 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,911,041 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 19,980,649 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 25,891,690 |  |  |
Accumulated Depreciation | (1,315,590) |  |  |
Investment in Real Estate Net | 24,576,100 |  |  |
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 | 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 | 5,639,147 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 40,504,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 23,664,826 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 64,168,826 |  |  |
Accumulated Depreciation | (11,317,834) |  |  |
Investment in Real Estate Net | 52,850,992 |  |  |
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 | 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 | 6,917,858 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 37,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 16,773,455 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 54,373,455 |  |  |
Accumulated Depreciation | (9,519,277) |  |  |
Investment in Real Estate Net | 44,854,178 |  |  |
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 | 177 |  |  |
Initial Cost to Company, Land | $ 52,654,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 23,045,751 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 8,635,413 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 52,654,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,681,164 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 84,335,164 |  |  |
Accumulated Depreciation | (15,575,683) |  |  |
Investment in Real Estate Net | 68,759,481 |  |  |
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 | 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 | 8,841,139 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 102,163,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 117,830,541 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 219,993,541 |  |  |
Accumulated Depreciation | (44,109,145) |  |  |
Investment in Real Estate Net | 175,884,396 |  |  |
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 | 173 |  |  |
Initial Cost to Company, Land | $ 16,667,059 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 67,690,072 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 48,612 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 16,667,059 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 67,738,684 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 84,405,743 |  |  |
Accumulated Depreciation | (4,037,098) |  |  |
Investment in Real Estate Net | 80,368,645 |  |  |
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 | 298 |  |  |
Initial Cost to Company, Land | $ 28,300,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 78,838,184 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,353,525 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 28,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 80,191,709 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 108,491,709 |  |  |
Accumulated Depreciation | (14,341,704) |  |  |
Investment in Real Estate Net | 94,150,005 |  |  |
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 | 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 | 1,138,671 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 13,700,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 60,226,190 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 73,926,190 |  |  |
Accumulated Depreciation | (10,132,810) |  |  |
Investment in Real Estate Net | 63,793,380 |  |  |
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 | 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 | 1,303,861 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 43,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 130,057,220 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 173,257,220 |  |  |
Accumulated Depreciation | (24,868,371) |  |  |
Investment in Real Estate Net | 148,388,849 |  |  |
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 | 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 | 9,833,303 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 3,033,500 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,135,686 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 40,169,186 |  |  |
Accumulated Depreciation | (26,282,067) |  |  |
Investment in Real Estate Net | 13,887,119 |  |  |
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 | 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 | 4,057,554 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 6,246,700 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 15,885,007 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 22,131,707 |  |  |
Accumulated Depreciation | (11,039,298) |  |  |
Investment in Real Estate Net | 11,092,409 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Pearl, The [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 86,236 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 6,972,585 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,613,651 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 33,586,236 |  |  |
Accumulated Depreciation | (1,802,018) |  |  |
Investment in Real Estate Net | 31,784,218 |  |  |
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 | 322 |  |  |
Initial Cost to Company, Land | $ 18,094,052 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 81,905,948 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,353,371 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 18,094,052 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 86,259,319 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 104,353,371 |  |  |
Accumulated Depreciation | (23,034,817) |  |  |
Investment in Real Estate Net | 81,318,554 |  |  |
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 | 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 | 21,252,912 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 35,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 54,726,734 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 89,826,734 |  |  |
Accumulated Depreciation | (22,557,639) |  |  |
Investment in Real Estate Net | 67,269,095 |  |  |
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 | 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 | 3,619,935 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 3,572,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,280,929 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 21,853,329 |  |  |
Accumulated Depreciation | (12,064,192) |  |  |
Investment in Real Estate Net | 9,789,137 |  |  |
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 | 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 | 4,531,435 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 8,640,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,018,561 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 34,658,561 |  |  |
Accumulated Depreciation | (14,294,138) |  |  |
Investment in Real Estate Net | 20,364,423 |  |  |
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 | 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 | 20,261,246 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 22,487,006 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 117,104,159 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 139,591,165 |  |  |
Accumulated Depreciation | (75,662,868) |  |  |
Investment in Real Estate Net | 63,928,297 |  |  |
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 | 453 |  |  |
Initial Cost to Company, Land | $ 40,830,011 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 178,838,375 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,685 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 40,830,011 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 178,841,060 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 219,671,071 |  |  |
Accumulated Depreciation | (4,297,727) |  |  |
Investment in Real Estate Net | 215,373,344 |  |  |
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 | 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 | 2,474,023 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 70,451,336 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 70,451,336 |  |  |
Accumulated Depreciation | (12,649,164) |  |  |
Investment in Real Estate Net | 57,802,172 |  |  |
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 | 256 |  |  |
Initial Cost to Company, Land | $ 32,000,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 64,436,539 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,366,624 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 32,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 65,803,163 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 97,803,163 |  |  |
Accumulated Depreciation | (25,533,405) |  |  |
Investment in Real Estate Net | 72,269,758 |  |  |
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 | 269 |  |  |
Initial Cost to Company, Land | $ 76,292,169 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 171,532,416 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 40,159 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 76,292,169 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 171,572,575 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 247,864,744 |  |  |
Accumulated Depreciation | (12,053,844) |  |  |
Investment in Real Estate Net | 235,810,900 |  |  |
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 | 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 | 6,603,855 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 28,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 76,399,770 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 104,599,770 |  |  |
Accumulated Depreciation | (35,742,052) |  |  |
Investment in Real Estate Net | 68,857,718 |  |  |
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 | 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 | 1,276,264 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 26,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 85,687,426 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 112,587,426 |  |  |
Accumulated Depreciation | (15,916,309) |  |  |
Investment in Real Estate Net | 96,671,117 |  |  |
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 | 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 | 1,069,525 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 15,546,376 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 66,389,535 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 81,935,911 |  |  |
Accumulated Depreciation | (13,743,779) |  |  |
Investment in Real Estate Net | 68,192,132 |  |  |
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 | 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 | 828,734 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 10,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 34,317,479 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 44,617,479 |  |  |
Accumulated Depreciation | (6,900,171) |  |  |
Investment in Real Estate Net | 37,717,308 |  |  |
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 | 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 | 5,843,205 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 1,857,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,556,459 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 24,413,859 |  |  |
Accumulated Depreciation | (16,685,572) |  |  |
Investment in Real Estate Net | 7,728,287 |  |  |
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 | 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 | 157,541 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 2,458,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 4,699,541 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 7,157,541 |  |  |
Accumulated Depreciation | (1,716,722) |  |  |
Investment in Real Estate Net | 5,440,819 |  |  |
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 | 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 | 3,985,141 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 27,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,014,746 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 64,014,746 |  |  |
Accumulated Depreciation | (7,098,473) |  |  |
Investment in Real Estate Net | 56,916,273 |  |  |
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 | 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 | 10,012,055 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 11,918,917 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 78,874,696 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 90,793,613 |  |  |
Accumulated Depreciation | (34,843,070) |  |  |
Investment in Real Estate Net | 55,950,543 |  |  |
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 | 584 |  |  |
Initial Cost to Company, Land | $ 16,769,205 |  |  |
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 | 2,904,720 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 16,769,205 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 80,416,243 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 97,185,448 |  |  |
Accumulated Depreciation | (27,282,993) |  |  |
Investment in Real Estate Net | 69,902,455 |  |  |
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 | 252 |  |  |
Initial Cost to Company, Land | $ 17,859,785 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 108,596,287 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 152,142 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 17,859,785 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 108,748,429 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 126,608,214 |  |  |
Accumulated Depreciation | (11,706,631) |  |  |
Investment in Real Estate Net | 114,901,583 |  |  |
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 | 88 |  |  |
Initial Cost to Company, Land | $ 12,118,248 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 40,458,283 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 28,122 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 12,118,248 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 40,486,405 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 52,604,653 |  |  |
Accumulated Depreciation | (2,670,021) |  |  |
Investment in Real Estate Net | 49,934,632 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Rianna I [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | 78 |  |  |
Initial Cost to Company, Land | $ 2,268,160 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 14,864,482 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 570,971 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 2,268,160 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 15,435,453 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 17,703,613 |  |  |
Accumulated Depreciation | (4,912,805) |  |  |
Investment in Real Estate Net | 12,790,808 |  |  |
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 | 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 | 5,443,381 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 11,809,500 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 39,447,429 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 51,256,929 |  |  |
Accumulated Depreciation | (23,108,949) |  |  |
Investment in Real Estate Net | 28,147,980 |  |  |
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 | 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 | 1,530,506 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 34,963,355 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 86,118,164 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 121,081,519 |  |  |
Accumulated Depreciation | (16,714,984) |  |  |
Investment in Real Estate Net | 104,366,535 |  |  |
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 | 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 | 1,833,334 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 17,136,645 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 42,369,865 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 59,506,510 |  |  |
Accumulated Depreciation | (7,532,830) |  |  |
Investment in Real Estate Net | 51,973,680 |  |  |
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 | 319 |  |  |
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 | 1,100,173 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 14,355,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 81,994,222 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 96,349,222 |  |  |
Accumulated Depreciation | (18,616,561) |  |  |
Investment in Real Estate Net | 77,732,661 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Rolling Green (Milford) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Milford, MA |  |  |
Real Estate And Accumulated Depreciation Units | 304 |  |  |
Initial Cost to Company, Land | $ 2,012,350 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 13,452,150 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 7,325,804 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 2,012,350 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 20,777,954 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 22,790,304 |  |  |
Accumulated Depreciation | (12,541,523) |  |  |
Investment in Real Estate Net | 10,248,781 |  |  |
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 | 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 | 873,630 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 4,922,840 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,075,790 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,998,630 |  |  |
Accumulated Depreciation | (7,963,684) |  |  |
Investment in Real Estate Net | 28,034,946 |  |  |
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 | 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 | 703,088 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 14,641,990 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 43,561,098 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 58,203,088 |  |  |
Accumulated Depreciation | (11,836,842) |  |  |
Investment in Real Estate Net | 46,366,246 |  |  |
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 | 96 |  |  |
Initial Cost to Company, Land | $ 663,800 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 5,974,803 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,798,267 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 663,800 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 9,773,070 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 10,436,870 |  |  |
Accumulated Depreciation | (7,029,871) |  |  |
Investment in Real Estate Net | 3,406,999 |  |  |
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 | 597 |  |  |
Initial Cost to Company, Land | $ 3,342,381 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 31,337,332 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 14,316,432 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 3,342,381 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,653,764 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 48,996,145 |  |  |
Accumulated Depreciation | (33,910,069) |  |  |
Investment in Real Estate Net | 15,086,076 |  |  |
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 | 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 | 3,079,215 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 10,560,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 28,653,672 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 39,213,672 |  |  |
Accumulated Depreciation | (16,045,953) |  |  |
Investment in Real Estate Net | 23,167,719 |  |  |
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 | 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 | 4,194,009 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 1,781,600 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 20,925,925 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 22,707,525 |  |  |
Accumulated Depreciation | (12,497,731) |  |  |
Investment in Real Estate Net | 10,209,794 |  |  |
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 | 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 | 4,638,329 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 16,836,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 40,052,329 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 56,888,329 |  |  |
Accumulated Depreciation | (11,663,739) |  |  |
Investment in Real Estate Net | 45,224,590 |  |  |
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 | 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 | 39,225,721 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 78,278,200 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 130,711,312 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 208,989,512 |  |  |
Accumulated Depreciation | (66,807,948) |  |  |
Investment in Real Estate Net | 142,181,564 |  |  |
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 | 0 |  |  |
Initial Cost to Company, Land | $ 29,406,606 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 3,589,891 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 29,406,606 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 3,589,891 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 32,996,497 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 32,996,497 |  |  |
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 | 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 | 4,962,421 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 7,503,400 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 29,010,928 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 36,514,328 |  |  |
Accumulated Depreciation | (17,403,278) |  |  |
Investment in Real Estate Net | 19,111,050 |  |  |
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 | 360 |  |  |
Initial Cost to Company, Land | $ 68,900,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 79,476,861 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,331,779 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 68,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 81,808,640 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 150,708,640 |  |  |
Accumulated Depreciation | (15,596,819) |  |  |
Investment in Real Estate Net | 135,111,821 |  |  |
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 | 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 | 3,202,676 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 6,936,600 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 17,526,745 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 24,463,345 |  |  |
Accumulated Depreciation | (11,356,629) |  |  |
Investment in Real Estate Net | 13,106,716 |  |  |
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 | 0 |  |  |
Initial Cost to Company, Land | $ 18,200,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 0 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 18,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 18,200,000 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 18,200,000 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Summerset Village II [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Chatsworth, CA |  |  |
Real Estate And Accumulated Depreciation Units | 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 12/31/2016, 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 | 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 | 3,586,242 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 26,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 32,021,266 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 58,021,266 |  |  |
Accumulated Depreciation | (7,628,434) |  |  |
Investment in Real Estate Net | 50,392,832 |  |  |
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 | 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 | 165,340 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 59,047,213 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 59,047,213 |  |  |
Accumulated Depreciation | (10,287,817) |  |  |
Investment in Real Estate Net | 48,759,396 |  |  |
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 | 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 | 982,446 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 14,087,610 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 17,296,597 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 31,384,207 |  |  |
Accumulated Depreciation | (5,171,269) |  |  |
Investment in Real Estate Net | 26,212,938 |  |  |
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 | 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 | 5,396,605 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 26,767,171 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 224,219,333 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 250,986,504 |  |  |
Accumulated Depreciation | (62,174,271) |  |  |
Investment in Real Estate Net | 188,812,233 |  |  |
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 | 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 | 703,110 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 7,030,766 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 29,708,872 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 36,739,638 |  |  |
Accumulated Depreciation | (4,264,421) |  |  |
Investment in Real Estate Net | 32,475,217 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Town Center South Commercial [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | St. Charles, MD |  |  |
Real Estate And Accumulated Depreciation Units | 0 |  |  |
Initial Cost to Company, Land | $ 1,500,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 9,394 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 1,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 9,394 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 1,509,394 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 1,509,394 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
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 | 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 | 2,117,754 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 15,568,464 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 57,147,361 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 72,715,825 |  |  |
Accumulated Depreciation | (17,050,654) |  |  |
Investment in Real Estate Net | 55,665,171 |  |  |
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 | 287 |  |  |
Initial Cost to Company, Land | $ 12,542,418 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 75,766,505 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 283,439 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 12,542,418 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 76,049,944 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 88,592,362 |  |  |
Accumulated Depreciation | (10,215,162) |  |  |
Investment in Real Estate Net | 78,377,200 |  |  |
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 | 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 | 724,720 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 8,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,913,008 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 31,713,008 |  |  |
Accumulated Depreciation | (10,116,792) |  |  |
Investment in Real Estate Net | 21,596,216 |  |  |
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 | 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 | 8,156,057 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 9,403,960 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 198,752,097 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 208,156,057 |  |  |
Accumulated Depreciation | (52,465,809) |  |  |
Investment in Real Estate Net | 155,690,248 |  |  |
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 | 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 | 750,251 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 15,322,724 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 76,926,845 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 92,249,569 |  |  |
Accumulated Depreciation | (14,412,958) |  |  |
Investment in Real Estate Net | 77,836,611 |  |  |
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 | 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 | 4,206,652 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,190,700 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 13,885,761 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 19,076,461 |  |  |
Accumulated Depreciation | (9,342,080) |  |  |
Investment in Real Estate Net | 9,734,381 |  |  |
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 | 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 | 1,921,459 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 18,539,817 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 132,328,824 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 150,868,641 |  |  |
Accumulated Depreciation | (34,495,297) |  |  |
Investment in Real Estate Net | 116,373,344 |  |  |
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 | 272 |  |  |
Initial Cost to Company, Land | $ 1,665,100 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 14,985,678 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 9,397,116 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 1,665,100 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 24,382,794 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 26,047,894 |  |  |
Accumulated Depreciation | (18,569,428) |  |  |
Investment in Real Estate Net | 7,478,466 |  |  |
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 | 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 | 814,553 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 15,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 41,673,949 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 56,773,949 |  |  |
Accumulated Depreciation | (7,931,652) |  |  |
Investment in Real Estate Net | 48,842,297 |  |  |
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 | 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 | 2,598,732 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 88,538,735 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 88,538,735 |  |  |
Accumulated Depreciation | (15,463,270) |  |  |
Investment in Real Estate Net | 73,075,465 |  |  |
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 | 554 |  |  |
Initial Cost to Company, Land | $ 27,709,329 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 175,174,600 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 15,853 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 27,709,329 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 175,190,453 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 202,899,782 |  |  |
Accumulated Depreciation | (5,630,074) |  |  |
Investment in Real Estate Net | 197,269,708 |  |  |
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 | 608 |  |  |
Initial Cost to Company, Land | $ 4,525,800 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 40,736,293 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 16,333,057 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 4,525,800 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 57,069,350 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 61,595,150 |  |  |
Accumulated Depreciation | (43,829,076) |  |  |
Investment in Real Estate Net | 17,766,074 |  |  |
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 | 220 |  |  |
Initial Cost to Company, Land | $ 15,550,260 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 69,449,740 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,412,841 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 15,550,260 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 70,862,581 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 86,412,841 |  |  |
Accumulated Depreciation | (21,083,205) |  |  |
Investment in Real Estate Net | 65,329,636 |  |  |
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 | 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 | 4,033,426 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 12,448,888 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 56,077,874 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 68,526,762 |  |  |
Accumulated Depreciation | (15,551,486) |  |  |
Investment in Real Estate Net | 52,975,276 |  |  |
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 | 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 | 6,380,938 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 34,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 114,866,797 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 149,266,797 |  |  |
Accumulated Depreciation | (20,648,479) |  |  |
Investment in Real Estate Net | 128,618,318 |  |  |
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 | 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 | 1,145,350 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 16,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 35,219,406 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 52,019,406 |  |  |
Accumulated Depreciation | (6,303,140) |  |  |
Investment in Real Estate Net | 45,716,266 |  |  |
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 | 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 | 4,128,963 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 84,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 71,184,465 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 155,984,465 |  |  |
Accumulated Depreciation | (15,247,357) |  |  |
Investment in Real Estate Net | 140,737,108 |  |  |
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 | 310 |  |  |
Initial Cost to Company, Land | $ 469,546 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 163,123,022 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,430,837 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 469,546 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 165,553,859 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 166,023,405 |  |  |
Accumulated Depreciation | (50,041,771) |  |  |
Investment in Real Estate Net | 115,981,634 |  |  |
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 | 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 | 467,221 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 10,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 44,602,428 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 55,202,428 |  |  |
Accumulated Depreciation | (8,102,186) |  |  |
Investment in Real Estate Net | 47,100,242 |  |  |
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 | 163 |  |  |
Initial Cost to Company, Land | $ 64,900,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 61,143,259 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,222,721 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 64,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 63,365,980 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 128,265,980 |  |  |
Accumulated Depreciation | (12,146,404) |  |  |
Investment in Real Estate Net | 116,119,576 |  |  |
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 | 204 |  |  |
Initial Cost to Company, Land | $ 34,200,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 56,962,630 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,395,974 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 34,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 59,358,604 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 93,558,604 |  |  |
Accumulated Depreciation | (10,435,607) |  |  |
Investment in Real Estate Net | 83,122,997 |  |  |
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 | 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 | 839,038 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 3,060,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 6,377,909 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 9,437,909 |  |  |
Accumulated Depreciation | (3,354,957) |  |  |
Investment in Real Estate Net | 6,082,952 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Westside Barry (fka Westside Villas VI) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Los Angeles, CA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 547,484 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 1,530,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 3,571,007 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 5,101,007 |  |  |
Accumulated Depreciation | (1,914,301) |  |  |
Investment in Real Estate Net | 3,186,706 |  |  |
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 | 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 | 589,475 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 1,785,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 3,822,729 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 5,607,729 |  |  |
Accumulated Depreciation | (2,090,807) |  |  |
Investment in Real Estate Net | 3,516,922 |  |  |
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 | 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 | 542,370 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 1,955,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 4,083,805 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 6,038,805 |  |  |
Accumulated Depreciation | (2,154,240) |  |  |
Investment in Real Estate Net | 3,884,565 |  |  |
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 | 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 | 838,212 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 3,060,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 6,377,602 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 9,437,602 |  |  |
Accumulated Depreciation | (3,356,464) |  |  |
Investment in Real Estate Net | 6,081,138 |  |  |
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 | 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 | 2,301,916 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 9,605,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,285,301 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 31,890,301 |  |  |
Accumulated Depreciation | (11,417,791) |  |  |
Investment in Real Estate Net | 20,472,510 |  |  |
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 | 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 | 9,609,243 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 2,662,900 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 33,594,740 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 36,257,640 |  |  |
Accumulated Depreciation | (24,492,262) |  |  |
Investment in Real Estate Net | 11,765,378 |  |  |
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 | 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 | 6,948,103 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 9,729,900 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 29,957,871 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 39,687,771 |  |  |
Accumulated Depreciation | (20,466,696) |  |  |
Investment in Real Estate Net | 19,221,075 |  |  |
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 | 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 | 110,281,527 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 110,281,527 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 110,281,527 |  |  |
Accumulated Depreciation | (86,786,203) |  |  |
Investment in Real Estate Net | 23,495,324 |  |  |
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 | 0 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 25,724 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 0 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 25,724 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 25,724 |  |  |
Accumulated Depreciation | 0 |  |  |
Investment in Real Estate Net | 25,724 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Other |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | N/A |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 51,888 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 51,888 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 51,888 |  |  |
Accumulated Depreciation | (3,279) |  |  |
Investment in Real Estate Net | 48,609 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Investment in Real Estate - Wholly Owned Unencumbered [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Units | 52,102 |  |  |
Initial Cost to Company, Land | $ 4,477,036,244 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 13,029,648,911 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 941,634,623 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 4,477,036,244 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 13,971,283,534 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 18,448,319,778 |  |  |
Accumulated Depreciation | (3,651,990,171) |  |  |
Investment in Real Estate Net | 14,796,329,607 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
101 West End [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | 506 |  |  |
Initial Cost to Company, Land | $ 190,600,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 131,374,708 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,789,525 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 190,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 135,164,233 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 325,764,233 |  |  |
Accumulated Depreciation | (29,116,644) |  |  |
Investment in Real Estate Net | 296,647,589 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 105,541,770 |  |  |
Joyce On Pentagon Row 1401 [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Arlington, VA |  |  |
Real Estate And Accumulated Depreciation Units | 326 |  |  |
Initial Cost to Company, Land | $ 9,780,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 89,668,165 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,067,409 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 9,780,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 93,735,574 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 103,515,574 |  |  |
Accumulated Depreciation | (28,321,732) |  |  |
Investment in Real Estate Net | 75,193,842 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 57,324,952 |  |  |
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 | 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 | 2,836,196 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 13,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 78,107,375 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 91,107,375 |  |  |
Accumulated Depreciation | (13,691,308) |  |  |
Investment in Real Estate Net | $ 77,416,067 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (K) |  |  |
300 East 39th [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | New York, NY |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 2,284,116 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 48,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 98,458,755 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 147,358,755 |  |  |
Accumulated Depreciation | (18,157,350) |  |  |
Investment in Real Estate Net | 129,201,405 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 59,763,098 |  |  |
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 | 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 | 2,200,064 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 79,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 81,322,688 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 160,722,688 |  |  |
Accumulated Depreciation | (16,079,870) |  |  |
Investment in Real Estate Net | $ 144,642,818 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (K) |  |  |
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 | 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 | 2,855,350 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 12,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,250,122 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 49,850,122 |  |  |
Accumulated Depreciation | (6,449,425) |  |  |
Investment in Real Estate Net | $ 43,400,697 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (K) |  |  |
4701 Willard Ave [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Chevy Chase, MD |  |  |
Real Estate And Accumulated Depreciation Units | 517 |  |  |
Initial Cost to Company, Land | $ 76,921,130 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 153,947,682 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 29,256,068 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 76,921,130 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 183,203,750 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 260,124,880 |  |  |
Accumulated Depreciation | (41,887,641) |  |  |
Investment in Real Estate Net | 218,237,239 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 92,377,799 |  |  |
55 West Fifth I & II [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Mateo, CA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 11,437,590 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 21,041,710 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 83,368,913 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 104,410,623 |  |  |
Accumulated Depreciation | (17,523,868) |  |  |
Investment in Real Estate Net | 86,886,755 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 27,229,091 |  |  |
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 | 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 | 1,300,274 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 59,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 157,161,879 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 217,061,879 |  |  |
Accumulated Depreciation | (27,296,410) |  |  |
Investment in Real Estate Net | 189,765,469 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 76,708,911 |  |  |
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 | 127 |  |  |
Initial Cost to Company, Land | $ 3,252,993 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 21,745,595 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 6,246,692 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 3,252,993 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 27,992,287 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 31,245,280 |  |  |
Accumulated Depreciation | (16,141,485) |  |  |
Investment in Real Estate Net | 15,103,795 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 1,007,468 |  |  |
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 | 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 | 8,049,828 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 25,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,643,022 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 56,643,022 |  |  |
Accumulated Depreciation | (16,858,183) |  |  |
Investment in Real Estate Net | 39,784,839 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 19,946,425 |  |  |
Acappella [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Pasadena, CA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 1,816,839 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,839,548 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,177,291 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 37,016,839 |  |  |
Accumulated Depreciation | (8,938,860) |  |  |
Investment in Real Estate Net | 28,077,979 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 19,213,624 |  |  |
Alborada [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Fremont, CA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 7,336,822 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 24,310,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 66,550,951 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 90,860,951 |  |  |
Accumulated Depreciation | (36,408,710) |  |  |
Investment in Real Estate Net | $ 54,452,241 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (I) |  |  |
Alcyone [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | 161 |  |  |
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 | 560,007 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 11,379,497 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 49,920,510 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 61,300,007 |  |  |
Accumulated Depreciation | (5,595,873) |  |  |
Investment in Real Estate Net | 55,704,134 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 28,675,325 |  |  |
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 | 410 |  |  |
Initial Cost to Company, Land | $ 26,650,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 62,850,000 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,319,564 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 26,650,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 64,169,564 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 90,819,564 |  |  |
Accumulated Depreciation | (18,676,294) |  |  |
Investment in Real Estate Net | $ 72,143,270 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
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 | 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 | 1,314,168 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 7,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 21,851,527 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 28,851,527 |  |  |
Accumulated Depreciation | (10,748,443) |  |  |
Investment in Real Estate Net | 18,103,084 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 22,749,081 |  |  |
Avanti [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Anaheim, CA |  |  |
Real Estate And Accumulated Depreciation Units | 162 |  |  |
Initial Cost to Company, Land | $ 12,960,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 18,497,682 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,706,778 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 12,960,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 21,204,460 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 34,164,460 |  |  |
Accumulated Depreciation | (8,619,700) |  |  |
Investment in Real Estate Net | 25,544,760 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 25,005,850 |  |  |
Avenir [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Boston, MA |  |  |
Real Estate And Accumulated Depreciation Units | 241 |  |  |
Initial Cost to Company, Land | $ 0 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 114,321,618 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,416,319 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 115,737,937 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 115,737,937 |  |  |
Accumulated Depreciation | (20,055,604) |  |  |
Investment in Real Estate Net | 95,682,333 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 90,544,765 |  |  |
Bella Vista Apartments at Boca Del Mar [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Woodland Hills, CA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 4,165,480 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 31,682,754 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 125,261,266 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 156,944,020 |  |  |
Accumulated Depreciation | (49,400,072) |  |  |
Investment in Real Estate Net | 107,543,948 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 57,848,455 |  |  |
Berkeleyan [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Berkeley, CA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 360,831 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 4,377,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 16,382,941 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 20,759,941 |  |  |
Accumulated Depreciation | (6,147,451) |  |  |
Investment in Real Estate Net | 14,612,490 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 8,188,077 |  |  |
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 | 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 | 1,869,918 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 12,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,397,297 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 57,997,297 |  |  |
Accumulated Depreciation | (8,314,350) |  |  |
Investment in Real Estate Net | $ 49,682,947 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (K) |  |  |
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 | 384 |  |  |
Initial Cost to Company, Land | $ 2,288,300 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 20,596,281 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 11,662,759 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 2,288,300 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 32,259,040 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 34,547,340 |  |  |
Accumulated Depreciation | (25,490,481) |  |  |
Investment in Real Estate Net | $ 9,056,859 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
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 | 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 | 2,167,212 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 3,397,100 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 11,456,286 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 14,853,386 |  |  |
Accumulated Depreciation | (7,244,601) |  |  |
Investment in Real Estate Net | 7,608,785 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 9,205,288 |  |  |
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 | 70 |  |  |
Initial Cost to Company, Land | $ 9,000,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 16,950,326 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,623,844 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 9,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,574,170 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 27,574,170 |  |  |
Accumulated Depreciation | (3,264,484) |  |  |
Investment in Real Estate Net | $ 24,309,686 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (K) |  |  |
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 | 214 |  |  |
Initial Cost to Company, Land | $ 18,300,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 66,392,414 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,359,210 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 18,300,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 69,751,624 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 88,051,624 |  |  |
Accumulated Depreciation | (12,463,465) |  |  |
Investment in Real Estate Net | $ 75,588,159 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (K) |  |  |
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 | 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 | 2,467,048 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 23,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 55,512,121 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 79,012,121 |  |  |
Accumulated Depreciation | (10,603,755) |  |  |
Investment in Real Estate Net | $ 68,408,366 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (K) |  |  |
Deerwood (SD) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Diego, CA |  |  |
Real Estate And Accumulated Depreciation Units | 316 |  |  |
Initial Cost to Company, Land | $ 2,082,095 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 18,739,815 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 14,552,126 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 2,082,095 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 33,291,941 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 35,374,036 |  |  |
Accumulated Depreciation | (26,781,646) |  |  |
Investment in Real Estate Net | $ 8,592,390 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
DelMarRidge [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | San Diego, CA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 3,554,417 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 7,801,824 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 40,502,593 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 48,304,417 |  |  |
Accumulated Depreciation | (13,227,515) |  |  |
Investment in Real Estate Net | 35,076,902 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 39,472,029 |  |  |
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 | 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 | 907,589 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 124,667,393 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 124,667,393 |  |  |
Accumulated Depreciation | (22,844,872) |  |  |
Investment in Real Estate Net | $ 101,822,521 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (K) |  |  |
Fairchase [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Fairfax, VA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 791,751 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 23,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 88,514,072 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 112,014,072 |  |  |
Accumulated Depreciation | (15,478,802) |  |  |
Investment in Real Estate Net | $ 96,535,270 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (K) |  |  |
Fairfield [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Stamford, CT |  |  |
Real Estate And Accumulated Depreciation Units | 263 |  |  |
Initial Cost to Company, Land | $ 6,510,200 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 39,690,120 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 7,374,368 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 6,510,200 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 47,064,488 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 53,574,688 |  |  |
Accumulated Depreciation | (30,942,121) |  |  |
Investment in Real Estate Net | 22,632,567 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 31,281,223 |  |  |
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 | 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 | 335,849 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 7,817,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,798,621 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 34,615,621 |  |  |
Accumulated Depreciation | (9,960,485) |  |  |
Investment in Real Estate Net | 24,655,136 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 16,055,441 |  |  |
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 | 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 | 891,807 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 35,200,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 109,660,005 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 144,860,005 |  |  |
Accumulated Depreciation | (18,523,867) |  |  |
Investment in Real Estate Net | $ 126,336,138 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (K) |  |  |
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 | 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 | 253,313 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 7,113,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 25,877,139 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 32,990,139 |  |  |
Accumulated Depreciation | (9,605,521) |  |  |
Investment in Real Estate Net | 23,384,618 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 14,492,793 |  |  |
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 | 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 | 580,456 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 17,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 75,259,373 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 92,759,373 |  |  |
Accumulated Depreciation | (12,410,304) |  |  |
Investment in Real Estate Net | 80,349,069 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 96,542,458 |  |  |
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 | 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 | 1,928,600 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 16,047,022 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 50,579,563 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 66,626,585 |  |  |
Accumulated Depreciation | (12,285,651) |  |  |
Investment in Real Estate Net | 54,340,934 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 31,863,038 |  |  |
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 | 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 | 8,822,118 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 2,512,500 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,434,030 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 33,946,530 |  |  |
Accumulated Depreciation | (23,107,759) |  |  |
Investment in Real Estate Net | 10,838,771 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 46,464,853 |  |  |
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 | 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 | 561,221 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,425,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 21,699,249 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 27,124,249 |  |  |
Accumulated Depreciation | (8,325,174) |  |  |
Investment in Real Estate Net | 18,799,075 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 25,879,145 |  |  |
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 | 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 | 487,960 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 10,752,145 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 35,116,075 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 45,868,220 |  |  |
Accumulated Depreciation | (10,739,451) |  |  |
Investment in Real Estate Net | 35,128,769 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 26,218,004 |  |  |
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 | 141 |  |  |
Initial Cost to Company, Land | $ 14,100,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 24,662,883 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,432,035 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 14,100,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 28,094,918 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 42,194,918 |  |  |
Accumulated Depreciation | (11,624,548) |  |  |
Investment in Real Estate Net | $ 30,570,370 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
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 | 153 |  |  |
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 | 759,840 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 42,010,884 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 42,010,884 |  |  |
Accumulated Depreciation | (15,478,760) |  |  |
Investment in Real Estate Net | 26,532,124 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 24,976,920 |  |  |
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 | 264 |  |  |
Initial Cost to Company, Land | $ 13,642,420 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 29,707,475 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,774,728 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 13,642,420 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 34,482,203 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 48,124,623 |  |  |
Accumulated Depreciation | (17,151,836) |  |  |
Investment in Real Estate Net | $ 30,972,787 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
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 | 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 | 5,895,100 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,977,504 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 32,644,211 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 38,621,715 |  |  |
Accumulated Depreciation | (15,657,977) |  |  |
Investment in Real Estate Net | 22,963,738 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 24,947,516 |  |  |
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 | 235 |  |  |
Initial Cost to Company, Land | $ 16,382,822 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 83,817,078 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,647,551 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 16,382,822 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 85,464,629 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 101,847,451 |  |  |
Accumulated Depreciation | (23,410,128) |  |  |
Investment in Real Estate Net | 78,437,323 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 44,696,782 |  |  |
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 | 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 | 4,693,142 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 20,880,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 94,948,651 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 115,828,651 |  |  |
Accumulated Depreciation | (38,397,081) |  |  |
Investment in Real Estate Net | 77,431,570 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 70,777,791 |  |  |
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 | 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 | 1,957,762 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 13,740,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 42,715,063 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 56,455,063 |  |  |
Accumulated Depreciation | (16,545,350) |  |  |
Investment in Real Estate Net | $ 39,909,713 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
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 | 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 | 1,040,629 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 8,540,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 13,250,610 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 21,790,610 |  |  |
Accumulated Depreciation | (5,406,375) |  |  |
Investment in Real Estate Net | 16,384,235 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 22,622,379 |  |  |
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 | 516 |  |  |
Initial Cost to Company, Land | $ 12,858,693 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 57,168,503 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 9,258,516 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 12,858,693 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 66,427,019 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 79,285,712 |  |  |
Accumulated Depreciation | (30,949,901) |  |  |
Investment in Real Estate Net | 48,335,811 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 69,242,252 |  |  |
Moda [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 875,933 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 12,649,228 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,717,945 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 50,367,173 |  |  |
Accumulated Depreciation | (11,291,703) |  |  |
Investment in Real Estate Net | $ 39,075,470 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (L) |  |  |
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 | 272 |  |  |
Initial Cost to Company, Land | $ 8,160,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 29,360,938 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 7,732,818 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 8,160,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,093,756 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 45,253,756 |  |  |
Accumulated Depreciation | (22,969,702) |  |  |
Investment in Real Estate Net | $ 22,284,054 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
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 | 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 | 813,248 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 60,394,146 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 60,394,146 |  |  |
Accumulated Depreciation | (17,426,612) |  |  |
Investment in Real Estate Net | 42,967,534 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 42,327,373 |  |  |
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 | 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 | 3,486,749 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 4,000,159 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 97,777,339 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 101,777,498 |  |  |
Accumulated Depreciation | (42,656,500) |  |  |
Investment in Real Estate Net | $ 59,120,998 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (I) |  |  |
Olympus Towers [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | 328 |  |  |
Initial Cost to Company, Land | $ 14,752,034 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 73,335,425 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 8,245,007 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 14,752,034 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 81,580,432 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 96,332,466 |  |  |
Accumulated Depreciation | (36,690,596) |  |  |
Investment in Real Estate Net | 59,641,870 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 49,754,197 |  |  |
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 | 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 | 9,695,764 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 71,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 221,602,905 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 293,502,905 |  |  |
Accumulated Depreciation | (39,044,321) |  |  |
Investment in Real Estate Net | $ 254,458,584 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (K) |  |  |
Providence [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Bothell, WA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 1,328,617 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 3,573,621 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 20,384,122 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 23,957,743 |  |  |
Accumulated Depreciation | (9,481,448) |  |  |
Investment in Real Estate Net | $ 14,476,295 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (I) |  |  |
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 | 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 | 4,133,203 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 10,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 56,946,138 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 67,446,138 |  |  |
Accumulated Depreciation | (26,559,665) |  |  |
Investment in Real Estate Net | $ 40,886,473 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
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 | 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 | 2,771,158 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 6,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 37,356,218 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 43,856,218 |  |  |
Accumulated Depreciation | (17,817,428) |  |  |
Investment in Real Estate Net | $ 26,038,790 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
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 | 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 | 2,674,707 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 16,345,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 75,755,377 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 92,100,377 |  |  |
Accumulated Depreciation | (31,075,305) |  |  |
Investment in Real Estate Net | $ 61,025,072 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (I) |  |  |
Reserve at Fairfax Corners [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Fairfax, VA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 10,544,380 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 15,804,057 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 73,673,431 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 89,477,488 |  |  |
Accumulated Depreciation | (35,713,995) |  |  |
Investment in Real Estate Net | 53,763,493 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 84,636,440 |  |  |
Rianna II [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | 78 |  |  |
Initial Cost to Company, Land | $ 2,161,840 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 14,433,614 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 335,207 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 2,161,840 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 14,768,821 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 16,930,661 |  |  |
Accumulated Depreciation | (4,665,753) |  |  |
Investment in Real Estate Net | 12,264,908 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 9,179,918 |  |  |
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 | 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 | 6,960,564 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 8,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,043,588 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 39,943,588 |  |  |
Accumulated Depreciation | (18,827,023) |  |  |
Investment in Real Estate Net | 21,116,565 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 64,374,172 |  |  |
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 | 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 | 5,142,411 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 3,380,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 27,095,274 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 30,475,274 |  |  |
Accumulated Depreciation | (15,457,341) |  |  |
Investment in Real Estate Net | 15,017,933 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 47,170,890 |  |  |
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 | 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 | 5,784,763 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 79,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 183,101,740 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 263,001,740 |  |  |
Accumulated Depreciation | (31,584,442) |  |  |
Investment in Real Estate Net | $ 231,417,298 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (K) |  |  |
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 | 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 | 18,949 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 7,222,544 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 26,296,405 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 33,518,949 |  |  |
Accumulated Depreciation | (3,222,469) |  |  |
Investment in Real Estate Net | $ 30,296,480 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (L) |  |  |
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 | 280 |  |  |
Initial Cost to Company, Land | $ 2,629,804 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 23,670,889 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 7,407,026 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 2,629,804 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 31,077,915 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 33,707,719 |  |  |
Accumulated Depreciation | (21,189,393) |  |  |
Investment in Real Estate Net | 12,518,326 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 37,994,251 |  |  |
Talleyrand [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Tarrytown, NY |  |  |
Real Estate And Accumulated Depreciation Units | 300 |  |  |
Initial Cost to Company, Land | $ 12,000,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 49,838,160 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 5,280,338 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 12,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 55,118,498 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 67,118,498 |  |  |
Accumulated Depreciation | (29,826,719) |  |  |
Investment in Real Estate Net | 37,291,779 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 34,794,181 |  |  |
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 | 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 | 3,924,692 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 28,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 65,841,362 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 94,441,362 |  |  |
Accumulated Depreciation | (27,199,505) |  |  |
Investment in Real Estate Net | 67,241,857 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 39,353,690 |  |  |
Toscana [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Irvine, CA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 13,015,608 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 39,410,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 63,821,680 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 103,231,680 |  |  |
Accumulated Depreciation | (35,049,666) |  |  |
Investment in Real Estate Net | 68,182,014 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 98,021,589 |  |  |
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 | 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 | 178,396 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 2,736,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 7,988,423 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 10,724,423 |  |  |
Accumulated Depreciation | (3,056,587) |  |  |
Investment in Real Estate Net | 7,667,836 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 4,965,054 |  |  |
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 | 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 | 5,090,465 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 24,360,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 91,269,179 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 115,629,179 |  |  |
Accumulated Depreciation | (37,802,676) |  |  |
Investment in Real Estate Net | 77,826,503 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 60,195,391 |  |  |
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 | 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 | 126,527 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 42,580,326 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 56,141,201 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 98,721,527 |  |  |
Accumulated Depreciation | (5,287,978) |  |  |
Investment in Real Estate Net | 93,433,549 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 42,297,038 |  |  |
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 | 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 | 6,676,131 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 12,650,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 40,332,423 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 52,982,423 |  |  |
Accumulated Depreciation | (19,770,723) |  |  |
Investment in Real Estate Net | 33,211,700 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 30,337,321 |  |  |
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 | 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 | 1,443,140 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 10,590,975 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,852,165 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 56,443,140 |  |  |
Accumulated Depreciation | (14,149,083) |  |  |
Investment in Real Estate Net | 42,294,057 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 45,950,109 |  |  |
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 | 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 | 651,436 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 10,350,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 36,084,873 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 46,434,873 |  |  |
Accumulated Depreciation | (13,516,691) |  |  |
Investment in Real Estate Net | $ 32,918,182 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (J) |  |  |
Vintage [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Ontario, CA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 991,090 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 7,059,230 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 48,668,852 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 55,728,082 |  |  |
Accumulated Depreciation | (18,740,063) |  |  |
Investment in Real Estate Net | 36,988,019 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 32,972,257 |  |  |
Vintage at 425 Broadway (fka Promenade) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Santa Monica, CA |  |  |
Real Estate And Accumulated Depreciation Units | 58 |  |  |
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 | 1,059,233 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 9,000,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 15,020,756 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 24,020,756 |  |  |
Accumulated Depreciation | (2,968,658) |  |  |
Investment in Real Estate Net | $ 21,052,098 |  |  |
Real Estate And Accumulated Depreciation, Encumbrances Reference | (K) |  |  |
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 | 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 | 1,803,032 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 60,900,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 49,996,869 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 110,896,869 |  |  |
Accumulated Depreciation | (10,859,764) |  |  |
Investment in Real Estate Net | 100,037,105 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 47,159,623 |  |  |
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 | 480 |  |  |
Initial Cost to Company, Land | $ 22,898,848 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 133,559,573 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,626,531 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 22,898,848 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 135,186,104 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 158,084,952 |  |  |
Accumulated Depreciation | (27,829,027) |  |  |
Investment in Real Estate Net | 130,255,925 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 95,942,439 |  |  |
Woodleaf [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Campbell, CA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 4,564,556 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 8,550,600 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 21,552,739 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 30,103,339 |  |  |
Accumulated Depreciation | (13,279,360) |  |  |
Investment in Real Estate Net | 16,823,979 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 17,803,590 |  |  |
Portfolio Entity Encumbrances [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Units |  |  |  |
Initial Cost to Company, Land |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements |  |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures |  |  |  |
Gross Amount Carried at close of period 12/31/2016, Land |  |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures |  |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures |  |  |  |
Accumulated Depreciation |  |  |  |
Investment in Real Estate Net |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 1,645,978,887 |  |  |
Investment in Real Estate - Wholly Owned Encumbered [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Units | 21,196 |  |  |
Initial Cost to Company, Land | $ 1,542,126,523 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 4,432,306,521 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 317,352,468 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 1,542,126,523 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 4,749,658,989 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 6,291,785,512 |  |  |
Accumulated Depreciation | (1,497,361,379) |  |  |
Investment in Real Estate Net | 4,794,424,133 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 3,818,071,013 |  |  |
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 | 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 | 6,364,098 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 796,800 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 13,537,823 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 14,334,623 |  |  |
Accumulated Depreciation | (10,501,930) |  |  |
Investment in Real Estate Net | 3,832,693 |  |  |
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 | 162 |  |  |
Initial Cost to Company, Land | $ 4,869,448 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 11,955,064 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 3,764,545 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 4,869,448 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 15,719,609 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 20,589,057 |  |  |
Accumulated Depreciation | (9,906,118) |  |  |
Investment in Real Estate Net | 10,682,939 |  |  |
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 | 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 | 6,382,976 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 6,105,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 35,944,841 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 42,049,841 |  |  |
Accumulated Depreciation | (18,330,095) |  |  |
Investment in Real Estate Net | 23,719,746 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Harrison Square (fka Elliot Bay) [Domain] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Seattle, WA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 4,889,669 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 7,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 40,734,014 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 48,334,014 |  |  |
Accumulated Depreciation | (7,462,882) |  |  |
Investment in Real Estate Net | 40,871,132 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Monterra in Mill Creek [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Mill Creek, WA |  |  |
Real Estate And Accumulated Depreciation Units | 139 |  |  |
Initial Cost to Company, Land | $ 2,800,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 13,255,123 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 935,693 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 2,800,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 14,190,816 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 16,990,816 |  |  |
Accumulated Depreciation | (6,101,965) |  |  |
Investment in Real Estate Net | 10,888,851 |  |  |
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 | 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 | 3,246,786 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,460,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 18,968,356 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 24,428,356 |  |  |
Accumulated Depreciation | (11,421,082) |  |  |
Investment in Real Estate Net | 13,007,274 |  |  |
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 | 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 | 699,374 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 4,400,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 13,667,376 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 18,067,376 |  |  |
Accumulated Depreciation | (5,724,191) |  |  |
Investment in Real Estate Net | 12,343,185 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Via Ventura (CA) (fka Ventura) [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Ventura, CA |  |  |
Real Estate And Accumulated Depreciation Units | 192 |  |  |
Initial Cost to Company, Land | $ 8,600,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 44,308,202 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 703,519 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 8,600,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 45,011,721 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 53,611,721 |  |  |
Accumulated Depreciation | (9,035,652) |  |  |
Investment in Real Estate Net | 44,576,069 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Wood Creek II (fka Willow Brook (CA)) |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Pleasant Hill, CA |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 6,380,861 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,055,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 44,769,533 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 49,824,533 |  |  |
Accumulated Depreciation | (20,343,063) |  |  |
Investment in Real Estate Net | 29,481,470 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 0 |  |  |
Investment in Real Estate - Partially Owned Unencumbered [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Units | 1,527 |  |  |
Initial Cost to Company, Land | $ 45,686,248 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 209,176,568 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 33,367,521 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 45,686,248 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 242,544,089 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 288,230,337 |  |  |
Accumulated Depreciation | (98,826,978) |  |  |
Investment in Real Estate Net | 189,403,359 |  |  |
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 | 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 | 5,224,512 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 4,507,100 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 17,799,326 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 22,306,426 |  |  |
Accumulated Depreciation | (12,054,134) |  |  |
Investment in Real Estate Net | 10,252,292 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 16,493,902 |  |  |
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 | 268 |  |  |
Initial Cost to Company, Land | $ 5,425,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 18,812,120 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 7,124,649 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,425,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 25,936,769 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 31,361,769 |  |  |
Accumulated Depreciation | (14,964,999) |  |  |
Investment in Real Estate Net | 16,396,770 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 28,108,382 |  |  |
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 | 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 | 6,190,412 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 6,945,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 29,255,388 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 36,200,388 |  |  |
Accumulated Depreciation | (16,167,257) |  |  |
Investment in Real Estate Net | 20,033,131 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 36,395,508 |  |  |
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 | 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 | 5,003,636 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,345,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 25,394,254 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 30,739,254 |  |  |
Accumulated Depreciation | (14,020,421) |  |  |
Investment in Real Estate Net | 16,718,833 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 28,811,122 |  |  |
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 | 144 |  |  |
Initial Cost to Company, Land | $ 4,550,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 18,064,764 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 4,440,120 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 4,550,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 22,504,884 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 27,054,884 |  |  |
Accumulated Depreciation | (12,562,453) |  |  |
Investment in Real Estate Net | 14,492,431 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 26,116,380 |  |  |
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 | 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 | 2,931,955 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 3,057,100 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 10,780,573 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 13,837,673 |  |  |
Accumulated Depreciation | (6,893,799) |  |  |
Investment in Real Estate Net | 6,943,874 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 9,801,248 |  |  |
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 | 142 |  |  |
Initial Cost to Company, Land | $ 5,500,000 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 15,216,613 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 2,761,807 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 5,500,000 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 17,978,420 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 23,478,420 |  |  |
Accumulated Depreciation | (7,925,733) |  |  |
Investment in Real Estate Net | 15,552,687 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 9,869,581 |  |  |
Wisconsin Place [Domain] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Description Of Location | Chevy Chase, MD |  |  |
Real Estate And Accumulated Depreciation Units | 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 | 1,021,679 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 0 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 173,111,034 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 173,111,034 |  |  |
Accumulated Depreciation | (27,622,092) |  |  |
Investment in Real Estate Net | 145,488,942 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 145,513,689 |  |  |
Investment in Real Estate - Partially Owned Encumbered [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Units | 1,688 |  |  |
Initial Cost to Company, Land | $ 35,329,200 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 288,061,878 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 34,698,770 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 35,329,200 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 322,760,648 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 358,089,848 |  |  |
Accumulated Depreciation | (112,210,888) |  |  |
Investment in Real Estate Net | 245,878,960 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 301,109,812 |  |  |
Total Consolidated Investment in Real Estate [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Real Estate And Accumulated Depreciation Units | 76,513 |  |  |
Initial Cost to Company, Land | $ 6,100,178,215 |  |  |
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements | 17,959,193,878 |  |  |
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Building And Fixtures | 1,327,053,382 |  |  |
Gross Amount Carried at close of period 12/31/2016, Land | 6,100,178,215 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements And Furnitures And Fixtures | 19,286,247,260 |  |  |
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements And Furnitures And Fixtures | 25,386,425,475 |  |  |
Accumulated Depreciation | (5,360,389,416) |  |  |
Investment in Real Estate Net | 20,026,036,059 |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances | $ 4,119,180,825 |  |  |
Partially Owned Properties – Unconsolidated |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Partially Owned Properties | 2 |  |  |
Apartment Units | 945 |  |  |
Depreciable Property [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Furniture, fixtures and equipment | $ 1,346,300,284 |  |  |
Building [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 30 |  |  |
Renovations and Improvements Minimum [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 5 |  |  |
Renovations and Improvements Maximum [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 15 |  |  |
Replacements Minimum [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 5 |  |  |
Replacements Maximum [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 10 |  |  |
Management Business Renovations and Improvements Minimum [Member] [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 3 |  |  |
Management Business Renovations and Improvements Maximum [Member] [Member] |  |  |  |
Real Estate And Accumulated Depreciation Abstract |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 7 |  |  |

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