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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Schedule of Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 1,170,076      
Initial Cost to Company of Land 901,997      
Initial Cost to Company of Buildings and Improvements 2,286,624      
Increase (Decrease) in Net Investments 910,921      
Carrying Amount of Land 906,984      
Carrying Amount of Buildings and Improvements 3,192,558      
Total Carrying Amount 4,099,542 $ 3,697,805 $ 3,466,482 $ 3,382,000
Accumulated Depreciation 490,227 416,657 $ 339,862 $ 287,066
Unamortized Loan Costs (10,078)      
Unamortized Premium 651 $ 753    
Real estate, federal income tax basis 4,000,000      
Operating lease right of use asset Initial Cost to Company of Land 56,961      
Operating lease right of use asset Initial Cost to Company of Buildings and Improvements 5,058      
Operating lease right of use asset Increase (Decrease) in Net Investments (2,013)      
Operating lease right of use asset Carrying Amount of Land 55,764      
Operating lease right of use asset Carrying Amount of Buildings and Improvements 4,242      
Operating lease, right-of-use asset $ 60,006      
Buildings        
Real Estate And Accumulated Depreciation [Line Items]        
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Real Estate Under Development        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 69,718      
Initial Cost to Company of Land 82,969      
Initial Cost to Company of Buildings and Improvements 53,847      
Increase (Decrease) in Net Investments 116,586      
Carrying Amount of Land 94,923      
Carrying Amount of Buildings and Improvements 158,479      
Total Carrying Amount 253,402      
Core Portfolio | Crescent Plaza Brockton, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land 1,147      
Initial Cost to Company of Buildings and Improvements 7,425      
Increase (Decrease) in Net Investments 3,301      
Carrying Amount of Land 1,147      
Carrying Amount of Buildings and Improvements 10,726      
Total Carrying Amount 11,873      
Accumulated Depreciation $ 8,455      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | New Loudon Center Latham, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 505      
Initial Cost to Company of Buildings and Improvements 4,161      
Increase (Decrease) in Net Investments 14,119      
Carrying Amount of Land 505      
Carrying Amount of Buildings and Improvements 18,280      
Total Carrying Amount 18,785      
Accumulated Depreciation $ 15,352      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Mark Plaza Edwardsville, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements $ 3,396      
Carrying Amount of Buildings and Improvements 3,396      
Total Carrying Amount 3,396      
Accumulated Depreciation $ 3,028      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Plaza 422 Lebanon, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 190      
Initial Cost to Company of Buildings and Improvements 3,004      
Increase (Decrease) in Net Investments 2,809      
Carrying Amount of Land 190      
Carrying Amount of Buildings and Improvements 5,813      
Total Carrying Amount 6,003      
Accumulated Depreciation $ 5,262      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Route 6 Mall Honesdale, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,664      
Increase (Decrease) in Net Investments 12,490      
Carrying Amount of Land 1,664      
Carrying Amount of Buildings and Improvements 12,490      
Total Carrying Amount 14,154      
Accumulated Depreciation $ 10,235      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Abington Towne Center Abington, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 799      
Initial Cost to Company of Buildings and Improvements 3,197      
Increase (Decrease) in Net Investments 3,872      
Carrying Amount of Land 799      
Carrying Amount of Buildings and Improvements 7,069      
Total Carrying Amount 7,868      
Accumulated Depreciation $ 4,222      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Bloomfield Town Square Bloomfield Hills, MI        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 3,207      
Initial Cost to Company of Buildings and Improvements 13,774      
Increase (Decrease) in Net Investments 25,803      
Carrying Amount of Land 3,207      
Carrying Amount of Buildings and Improvements 39,577      
Total Carrying Amount 42,784      
Accumulated Depreciation $ 24,739      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Elmwood Park Shopping Center Elmwood Park, NJ        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 3,248      
Initial Cost to Company of Buildings and Improvements 12,992      
Increase (Decrease) in Net Investments 16,314      
Carrying Amount of Land 3,798      
Carrying Amount of Buildings and Improvements 28,756      
Total Carrying Amount 32,554      
Accumulated Depreciation $ 20,402      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Merrillville Plaza Hobart, IN        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,288      
Initial Cost to Company of Buildings and Improvements 17,152      
Increase (Decrease) in Net Investments 6,058      
Carrying Amount of Land 4,288      
Carrying Amount of Buildings and Improvements 23,210      
Total Carrying Amount 27,498      
Accumulated Depreciation $ 13,910      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Marketplace of Absecon Absecon, NJ        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 2,573      
Initial Cost to Company of Buildings and Improvements 10,294      
Increase (Decrease) in Net Investments 5,072      
Carrying Amount of Land 2,577      
Carrying Amount of Buildings and Improvements 15,362      
Total Carrying Amount 17,939      
Accumulated Depreciation $ 9,096      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 239 Greenwich Avenue Greenwich, CT        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 26,572      
Initial Cost to Company of Land 1,817      
Initial Cost to Company of Buildings and Improvements 15,846      
Increase (Decrease) in Net Investments 1,086      
Carrying Amount of Land 1,817      
Carrying Amount of Buildings and Improvements 16,932      
Total Carrying Amount 18,749      
Accumulated Depreciation $ 8,738      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Hobson West Plaza Naperville, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,793      
Initial Cost to Company of Buildings and Improvements 7,172      
Increase (Decrease) in Net Investments 4,604      
Carrying Amount of Land 1,793      
Carrying Amount of Buildings and Improvements 11,776      
Total Carrying Amount 13,569      
Accumulated Depreciation $ 5,871      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Village Commons Shopping Center Smithtown, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 3,229      
Initial Cost to Company of Buildings and Improvements 12,917      
Increase (Decrease) in Net Investments 5,228      
Carrying Amount of Land 3,229      
Carrying Amount of Buildings and Improvements 18,145      
Total Carrying Amount 21,374      
Accumulated Depreciation $ 10,479      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Town Line Plaza Rocky Hill, CT        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 878      
Initial Cost to Company of Buildings and Improvements 3,510      
Increase (Decrease) in Net Investments 7,736      
Carrying Amount of Land 907      
Carrying Amount of Buildings and Improvements 11,217      
Total Carrying Amount 12,124      
Accumulated Depreciation $ 9,348      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Branch Shopping Center Smithtown, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 3,156      
Initial Cost to Company of Buildings and Improvements 12,545      
Increase (Decrease) in Net Investments 16,414      
Carrying Amount of Land 3,401      
Carrying Amount of Buildings and Improvements 28,714      
Total Carrying Amount 32,115      
Accumulated Depreciation $ 14,322      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Methuen Shopping Center Methuen, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 956      
Initial Cost to Company of Buildings and Improvements 3,826      
Increase (Decrease) in Net Investments 1,695      
Carrying Amount of Land 961      
Carrying Amount of Buildings and Improvements 5,516      
Total Carrying Amount 6,477      
Accumulated Depreciation $ 2,866      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | The Gateway Shopping Center South Burlington, VT        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,273      
Initial Cost to Company of Buildings and Improvements 5,091      
Increase (Decrease) in Net Investments 12,471      
Carrying Amount of Land 1,273      
Carrying Amount of Buildings and Improvements 17,562      
Total Carrying Amount 18,835      
Accumulated Depreciation $ 10,712      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Mad River Station Dayton, OH        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 2,350      
Initial Cost to Company of Buildings and Improvements 9,404      
Increase (Decrease) in Net Investments 2,251      
Carrying Amount of Land 2,350      
Carrying Amount of Buildings and Improvements 11,655      
Total Carrying Amount 14,005      
Accumulated Depreciation $ 6,310      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Brandywine Holdings Wilmington, DE        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 26,250      
Initial Cost to Company of Land 5,063      
Initial Cost to Company of Buildings and Improvements 15,252      
Increase (Decrease) in Net Investments 2,495      
Carrying Amount of Land 5,201      
Carrying Amount of Buildings and Improvements 17,609      
Total Carrying Amount 22,810      
Accumulated Depreciation $ 7,601      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Bartow Avenue Bronx, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,691      
Initial Cost to Company of Buildings and Improvements 5,803      
Increase (Decrease) in Net Investments 1,196      
Carrying Amount of Land 1,691      
Carrying Amount of Buildings and Improvements 6,999      
Total Carrying Amount 8,690      
Accumulated Depreciation $ 3,458      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Amboy Road Staten Island, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements $ 11,909      
Increase (Decrease) in Net Investments 3,175      
Carrying Amount of Buildings and Improvements 15,084      
Total Carrying Amount 15,084      
Accumulated Depreciation $ 8,094      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Chestnut Hill Philadelphia, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 8,289      
Initial Cost to Company of Buildings and Improvements 5,691      
Increase (Decrease) in Net Investments 4,509      
Carrying Amount of Land 8,289      
Carrying Amount of Buildings and Improvements 10,200      
Total Carrying Amount 18,489      
Accumulated Depreciation $ 4,910      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 2914 Third Avenue Bronx, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 11,108      
Initial Cost to Company of Buildings and Improvements 8,038      
Increase (Decrease) in Net Investments 5,175      
Carrying Amount of Land 11,855      
Carrying Amount of Buildings and Improvements 12,466      
Total Carrying Amount 24,321      
Accumulated Depreciation $ 3,420      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | West Shore Expressway Staten Island, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 3,380      
Initial Cost to Company of Buildings and Improvements 13,499      
Increase (Decrease) in Net Investments 28      
Carrying Amount of Land 3,380      
Carrying Amount of Buildings and Improvements 13,527      
Total Carrying Amount 16,907      
Accumulated Depreciation $ 4,878      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | West 54th Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 16,699      
Initial Cost to Company of Buildings and Improvements 18,704      
Increase (Decrease) in Net Investments 1,264      
Carrying Amount of Land 16,699      
Carrying Amount of Buildings and Improvements 19,968      
Total Carrying Amount 36,667      
Accumulated Depreciation $ 6,730      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 5-7 East 17th Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 3,048      
Initial Cost to Company of Buildings and Improvements 7,281      
Increase (Decrease) in Net Investments 6,133      
Carrying Amount of Land 3,048      
Carrying Amount of Buildings and Improvements 13,414      
Total Carrying Amount 16,462      
Accumulated Depreciation $ 3,386      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 651-671 W Diversey Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 8,576      
Initial Cost to Company of Buildings and Improvements 17,256      
Increase (Decrease) in Net Investments 8      
Carrying Amount of Land 8,576      
Carrying Amount of Buildings and Improvements 17,264      
Total Carrying Amount 25,840      
Accumulated Depreciation $ 3,704      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 15 Mercer Street Manhattan NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,887      
Initial Cost to Company of Buildings and Improvements 2,483      
Increase (Decrease) in Net Investments 1      
Carrying Amount of Land 1,887      
Carrying Amount of Buildings and Improvements 2,484      
Total Carrying Amount 4,371      
Accumulated Depreciation $ 528      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 4401 White Plains Bronx, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,581      
Initial Cost to Company of Buildings and Improvements 5,054      
Carrying Amount of Land 1,581      
Carrying Amount of Buildings and Improvements 5,054      
Total Carrying Amount 6,635      
Accumulated Depreciation $ 1,053      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 56E Walton Chicago IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 994      
Initial Cost to Company of Buildings and Improvements 6,126      
Increase (Decrease) in Net Investments 2,558      
Carrying Amount of Land 994      
Carrying Amount of Buildings and Improvements 8,684      
Total Carrying Amount 9,678      
Accumulated Depreciation $ 177      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 841 W. Armitage Chicago IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 728      
Initial Cost to Company of Buildings and Improvements 1,989      
Increase (Decrease) in Net Investments 422      
Carrying Amount of Land 728      
Carrying Amount of Buildings and Improvements 2,411      
Total Carrying Amount 3,139      
Accumulated Depreciation $ 517      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 2731 N Clark Chicago IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 557      
Initial Cost to Company of Buildings and Improvements 1,839      
Increase (Decrease) in Net Investments 32      
Carrying Amount of Land 557      
Carrying Amount of Buildings and Improvements 1,871      
Total Carrying Amount 2,428      
Accumulated Depreciation $ 402      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 1520 Milwaukee Avenue Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 2,110      
Initial Cost to Company of Buildings and Improvements 1,306      
Increase (Decrease) in Net Investments 290      
Carrying Amount of Land 2,110      
Carrying Amount of Buildings and Improvements 1,596      
Total Carrying Amount 3,706      
Accumulated Depreciation $ 304      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 2140 N Clyboum Chicago IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 306      
Initial Cost to Company of Buildings and Improvements 788      
Carrying Amount of Land 306      
Carrying Amount of Buildings and Improvements 788      
Total Carrying Amount 1,094      
Accumulated Depreciation $ 168      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 853 W. Armitage Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 557      
Initial Cost to Company of Buildings and Improvements 1,946      
Increase (Decrease) in Net Investments 439      
Carrying Amount of Land 557      
Carrying Amount of Buildings and Improvements 2,385      
Total Carrying Amount 2,942      
Accumulated Depreciation $ 557      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Rhode Island Place Shopping Center Washington, D.C.        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 7,458      
Initial Cost to Company of Buildings and Improvements 15,968      
Increase (Decrease) in Net Investments 1,902      
Carrying Amount of Land 7,458      
Carrying Amount of Buildings and Improvements 17,870      
Total Carrying Amount 25,328      
Accumulated Depreciation $ 3,995      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 2299 N. Clybourn Avenue Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 177      
Initial Cost to Company of Buildings and Improvements 484      
Carrying Amount of Land 177      
Carrying Amount of Buildings and Improvements 484      
Total Carrying Amount 661      
Accumulated Depreciation $ 102      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 930 Rush Street Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,933      
Initial Cost to Company of Buildings and Improvements 14,587      
Carrying Amount of Land 4,933      
Carrying Amount of Buildings and Improvements 14,587      
Total Carrying Amount 19,520      
Accumulated Depreciation $ 2,826      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 843-45 W. Armitage Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 731      
Initial Cost to Company of Buildings and Improvements 2,730      
Increase (Decrease) in Net Investments 228      
Carrying Amount of Land 731      
Carrying Amount of Buildings and Improvements 2,958      
Total Carrying Amount 3,689      
Accumulated Depreciation $ 590      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 28 Jericho Turnpike Westbury, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 13,416      
Initial Cost to Company of Land 6,220      
Initial Cost to Company of Buildings and Improvements 24,416      
Increase (Decrease) in Net Investments 12      
Carrying Amount of Land 6,220      
Carrying Amount of Buildings and Improvements 24,428      
Total Carrying Amount 30,648      
Accumulated Depreciation $ 4,856      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 1525 W. Belmont Avenue Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,480      
Initial Cost to Company of Buildings and Improvements 3,338      
Increase (Decrease) in Net Investments 710      
Carrying Amount of Land 1,480      
Carrying Amount of Buildings and Improvements 4,048      
Total Carrying Amount 5,528      
Accumulated Depreciation $ 735      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 181 Main Street Westport, CT        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,908      
Initial Cost to Company of Buildings and Improvements 12,158      
Increase (Decrease) in Net Investments 409      
Carrying Amount of Land 1,908      
Carrying Amount of Buildings and Improvements 12,567      
Total Carrying Amount 14,475      
Accumulated Depreciation $ 2,279      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 2206-08 N. Halsted Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,183      
Initial Cost to Company of Buildings and Improvements 3,540      
Increase (Decrease) in Net Investments 351      
Carrying Amount of Land 1,183      
Carrying Amount of Buildings and Improvements 3,891      
Total Carrying Amount 5,074      
Accumulated Depreciation $ 961      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 83 Spring Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,754      
Initial Cost to Company of Buildings and Improvements 9,200      
Carrying Amount of Land 1,754      
Carrying Amount of Buildings and Improvements 9,200      
Total Carrying Amount 10,954      
Accumulated Depreciation $ 1,725      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 2633 N. Halsted Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 960      
Initial Cost to Company of Buildings and Improvements 4,096      
Increase (Decrease) in Net Investments 359      
Carrying Amount of Land 998      
Carrying Amount of Buildings and Improvements 4,417      
Total Carrying Amount 5,415      
Accumulated Depreciation $ 837      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 60 Orange Street Bloomfield, NJ        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 7,001      
Initial Cost to Company of Land 3,609      
Initial Cost to Company of Buildings and Improvements 10,790      
Carrying Amount of Land 3,609      
Carrying Amount of Buildings and Improvements 10,790      
Total Carrying Amount 14,399      
Accumulated Depreciation $ 2,157      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 50-54 E. Walton Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 2,848      
Initial Cost to Company of Buildings and Improvements 12,694      
Increase (Decrease) in Net Investments 570      
Carrying Amount of Land 2,848      
Carrying Amount of Buildings and Improvements 13,264      
Total Carrying Amount 16,112      
Accumulated Depreciation $ 2,613      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 179-53 & 1801-03 Connecticut Avenue Washington, D.C.        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 11,690      
Initial Cost to Company of Buildings and Improvements 10,135      
Increase (Decrease) in Net Investments 1,088      
Carrying Amount of Land 11,690      
Carrying Amount of Buildings and Improvements 11,223      
Total Carrying Amount 22,913      
Accumulated Depreciation $ 2,205      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 662 W. Diversey Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,713      
Initial Cost to Company of Buildings and Improvements 1,603      
Increase (Decrease) in Net Investments 10      
Carrying Amount of Land 1,713      
Carrying Amount of Buildings and Improvements 1,613      
Total Carrying Amount 3,326      
Accumulated Depreciation $ 284      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 639 West Diversey Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,429      
Initial Cost to Company of Buildings and Improvements 6,102      
Increase (Decrease) in Net Investments 1,034      
Carrying Amount of Land 4,429      
Carrying Amount of Buildings and Improvements 7,136      
Total Carrying Amount 11,565      
Accumulated Depreciation $ 1,503      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 837 W. Armitage Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 780      
Initial Cost to Company of Buildings and Improvements 1,758      
Increase (Decrease) in Net Investments 237      
Carrying Amount of Land 780      
Carrying Amount of Buildings and Improvements 1,995      
Total Carrying Amount 2,775      
Accumulated Depreciation $ 393      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 664 North Michigan Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 15,240      
Initial Cost to Company of Buildings and Improvements 65,331      
Carrying Amount of Land 15,240      
Carrying Amount of Buildings and Improvements 65,331      
Total Carrying Amount 80,571      
Accumulated Depreciation $ 11,229      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 823 W. Armitage Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 717      
Initial Cost to Company of Buildings and Improvements 1,149      
Increase (Decrease) in Net Investments 95      
Carrying Amount of Land 717      
Carrying Amount of Buildings and Improvements 1,244      
Total Carrying Amount 1,961      
Accumulated Depreciation $ 223      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 8-12 E. Walton Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 5,398      
Initial Cost to Company of Buildings and Improvements 15,601      
Increase (Decrease) in Net Investments 978      
Carrying Amount of Land 5,398      
Carrying Amount of Buildings and Improvements 16,579      
Total Carrying Amount 21,977      
Accumulated Depreciation $ 2,910      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 851 W. Armitage Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 545      
Initial Cost to Company of Buildings and Improvements 209      
Increase (Decrease) in Net Investments 139      
Carrying Amount of Land 545      
Carrying Amount of Buildings and Improvements 348      
Total Carrying Amount 893      
Accumulated Depreciation $ 107      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 3200-3204 M Street Washington, DC        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 6,899      
Initial Cost to Company of Buildings and Improvements 4,249      
Increase (Decrease) in Net Investments 168      
Carrying Amount of Land 6,899      
Carrying Amount of Buildings and Improvements 4,417      
Total Carrying Amount 11,316      
Accumulated Depreciation $ 839      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 1240 W. Belmont Avenue Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 2,137      
Initial Cost to Company of Buildings and Improvements 1,589      
Increase (Decrease) in Net Investments 583      
Carrying Amount of Land 2,137      
Carrying Amount of Buildings and Improvements 2,172      
Total Carrying Amount 4,309      
Accumulated Depreciation $ 456      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 868 Broadway Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 3,519      
Initial Cost to Company of Buildings and Improvements 9,247      
Increase (Decrease) in Net Investments 5      
Carrying Amount of Land 3,519      
Carrying Amount of Buildings and Improvements 9,252      
Total Carrying Amount 12,771      
Accumulated Depreciation $ 1,405      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 21 E. Chestnut Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,318      
Initial Cost to Company of Buildings and Improvements 8,468      
Increase (Decrease) in Net Investments 34      
Carrying Amount of Land 1,318      
Carrying Amount of Buildings and Improvements 8,502      
Total Carrying Amount 9,820      
Accumulated Depreciation $ 1,503      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 313-315 Bowery Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements $ 5,516      
Carrying Amount of Buildings and Improvements 5,516      
Total Carrying Amount 5,516      
Accumulated Depreciation $ 1,339      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 819 W. Armitage Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 790      
Initial Cost to Company of Buildings and Improvements 1,266      
Increase (Decrease) in Net Investments 140      
Carrying Amount of Land 790      
Carrying Amount of Buildings and Improvements 1,406      
Total Carrying Amount 2,196      
Accumulated Depreciation $ 336      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 120 West Broadway Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements $ 32,819      
Increase (Decrease) in Net Investments 1,124      
Carrying Amount of Buildings and Improvements 33,943      
Total Carrying Amount 33,943      
Accumulated Depreciation $ 3,403      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 11 E. Walton Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 16,744      
Initial Cost to Company of Buildings and Improvements 28,346      
Increase (Decrease) in Net Investments 195      
Carrying Amount of Land 16,744      
Carrying Amount of Buildings and Improvements 28,541      
Total Carrying Amount 45,285      
Accumulated Depreciation $ 4,373      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 330-340 River St Cambridge, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 11,140      
Initial Cost to Company of Land 8,404      
Initial Cost to Company of Buildings and Improvements 14,235      
Carrying Amount of Land 8,404      
Carrying Amount of Buildings and Improvements 14,235      
Total Carrying Amount 22,639      
Accumulated Depreciation $ 2,914      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 61 Main St. Westport, CT        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,578      
Initial Cost to Company of Buildings and Improvements 2,645      
Increase (Decrease) in Net Investments 789      
Carrying Amount of Land 4,578      
Carrying Amount of Buildings and Improvements 3,434      
Total Carrying Amount 8,012      
Accumulated Depreciation $ 436      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 865 W. North Avenue Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,893      
Initial Cost to Company of Buildings and Improvements 11,594      
Increase (Decrease) in Net Investments 41      
Carrying Amount of Land 1,893      
Carrying Amount of Buildings and Improvements 11,635      
Total Carrying Amount 13,528      
Accumulated Depreciation $ 1,688      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 152-154 Spring St. Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 8,544      
Initial Cost to Company of Buildings and Improvements 27,001      
Increase (Decrease) in Net Investments 180      
Carrying Amount of Land 8,544      
Carrying Amount of Buildings and Improvements 27,181      
Total Carrying Amount 35,725      
Accumulated Depreciation $ 3,878      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 2520 Flatbush Ave Brooklyn, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 6,613      
Initial Cost to Company of Buildings and Improvements 10,419      
Increase (Decrease) in Net Investments 303      
Carrying Amount of Land 6,613      
Carrying Amount of Buildings and Improvements 10,722      
Total Carrying Amount 17,335      
Accumulated Depreciation $ 1,575      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 252-256 Greenwich Avenue Greenwich, CT        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 10,175      
Initial Cost to Company of Buildings and Improvements 12,641      
Increase (Decrease) in Net Investments 544      
Carrying Amount of Land 10,175      
Carrying Amount of Buildings and Improvements 13,185      
Total Carrying Amount 23,360      
Accumulated Depreciation $ 2,008      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Bedford Green Bedford Hills, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 12,425      
Initial Cost to Company of Buildings and Improvements 32,730      
Increase (Decrease) in Net Investments 4,370      
Carrying Amount of Land 13,763      
Carrying Amount of Buildings and Improvements 35,762      
Total Carrying Amount 49,525      
Accumulated Depreciation $ 5,263      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 131-135 Prince Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements $ 57,536      
Increase (Decrease) in Net Investments 625      
Carrying Amount of Buildings and Improvements 58,161      
Total Carrying Amount 58,161      
Accumulated Depreciation $ 14,554      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Shops at Grand Ave Queens, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 20,264      
Initial Cost to Company of Buildings and Improvements 33,131      
Increase (Decrease) in Net Investments 1,715      
Carrying Amount of Land 20,264      
Carrying Amount of Buildings and Improvements 34,846      
Total Carrying Amount 55,110      
Accumulated Depreciation $ 4,615      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 201 Needham St. Newton, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,550      
Initial Cost to Company of Buildings and Improvements 4,459      
Increase (Decrease) in Net Investments 105      
Carrying Amount of Land 4,550      
Carrying Amount of Buildings and Improvements 4,564      
Total Carrying Amount 9,114      
Accumulated Depreciation $ 652      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | City Center San Francisco, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 36,063      
Initial Cost to Company of Buildings and Improvements 109,098      
Increase (Decrease) in Net Investments (24,600)      
Carrying Amount of Land 26,386      
Carrying Amount of Buildings and Improvements 94,175      
Total Carrying Amount 120,561      
Accumulated Depreciation $ 13,356      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 163 Highland Avenue Needham, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 8,582      
Initial Cost to Company of Land 12,679      
Initial Cost to Company of Buildings and Improvements 11,213      
Increase (Decrease) in Net Investments 43      
Carrying Amount of Land 12,679      
Carrying Amount of Buildings and Improvements 11,256      
Total Carrying Amount 23,935      
Accumulated Depreciation $ 1,486      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Roosevelt Galleria Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,838      
Initial Cost to Company of Buildings and Improvements 14,574      
Increase (Decrease) in Net Investments 61      
Carrying Amount of Land 4,838      
Carrying Amount of Buildings and Improvements 14,635      
Total Carrying Amount 19,473      
Accumulated Depreciation $ 1,590      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Route 202 Shopping Center Wilmington, DE        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements $ 6,346      
Increase (Decrease) in Net Investments 501      
Carrying Amount of Buildings and Improvements 6,847      
Total Carrying Amount 6,847      
Accumulated Depreciation $ 1,297      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 165 Newbury Street - Boston, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,918      
Initial Cost to Company of Buildings and Improvements 3,980      
Carrying Amount of Land 1,918      
Carrying Amount of Buildings and Improvements 3,980      
Total Carrying Amount 5,898      
Accumulated Depreciation $ 365      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Concord & Milwaukee - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 2,650      
Initial Cost to Company of Land 2,739      
Initial Cost to Company of Buildings and Improvements 2,746      
Increase (Decrease) in Net Investments 246      
Carrying Amount of Land 2,739      
Carrying Amount of Buildings and Improvements 2,992      
Total Carrying Amount 5,731      
Accumulated Depreciation $ 278      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | State & Washington - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 23,881      
Initial Cost to Company of Land 3,907      
Initial Cost to Company of Buildings and Improvements 70,943      
Increase (Decrease) in Net Investments 5,436      
Carrying Amount of Land 3,907      
Carrying Amount of Buildings and Improvements 76,379      
Total Carrying Amount 80,286      
Accumulated Depreciation $ 6,205      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 151 N. State Street Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 13,574      
Initial Cost to Company of Land 1,941      
Initial Cost to Company of Buildings and Improvements 25,529      
Carrying Amount of Land 1,941      
Carrying Amount of Buildings and Improvements 25,529      
Total Carrying Amount 27,470      
Accumulated Depreciation $ 2,181      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | North & Kingsbury - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 12,164      
Initial Cost to Company of Land 18,731      
Initial Cost to Company of Buildings and Improvements 16,292      
Increase (Decrease) in Net Investments 192      
Carrying Amount of Land 18,731      
Carrying Amount of Buildings and Improvements 16,484      
Total Carrying Amount 35,215      
Accumulated Depreciation $ 1,420      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Sullivan Center - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 50,000      
Initial Cost to Company of Land 13,443      
Initial Cost to Company of Buildings and Improvements 137,327      
Increase (Decrease) in Net Investments 536      
Carrying Amount of Land 13,443      
Carrying Amount of Buildings and Improvements 137,863      
Total Carrying Amount 151,306      
Accumulated Depreciation $ 11,837      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | California & Armitage - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 2,506      
Initial Cost to Company of Land 6,770      
Initial Cost to Company of Buildings and Improvements 2,292      
Increase (Decrease) in Net Investments 2      
Carrying Amount of Land 6,770      
Carrying Amount of Buildings and Improvements 2,294      
Total Carrying Amount 9,064      
Accumulated Depreciation $ 211      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 555 9th Street - San Francisco, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 60,000      
Initial Cost to Company of Land 75,591      
Initial Cost to Company of Buildings and Improvements 73,268      
Increase (Decrease) in Net Investments 82      
Carrying Amount of Land 75,591      
Carrying Amount of Buildings and Improvements 73,350      
Total Carrying Amount 148,941      
Accumulated Depreciation $ 5,848      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Market Square Wilmington, DE        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 8,100      
Initial Cost to Company of Buildings and Improvements 31,221      
Increase (Decrease) in Net Investments 313      
Carrying Amount of Land 8,100      
Carrying Amount of Buildings and Improvements 31,534      
Total Carrying Amount 39,634      
Accumulated Depreciation $ 1,807      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Undeveloped Land        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 100      
Carrying Amount of Land 100      
Total Carrying Amount 100      
Core Portfolio | 991 Madison Avenue Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements 76,965      
Increase (Decrease) in Net Investments 1,691      
Carrying Amount of Buildings and Improvements 78,656      
Total Carrying Amount 78,656      
Accumulated Depreciation $ 6,160      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 613-623 W. Diversey Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 10,061      
Initial Cost to Company of Buildings and Improvements 2,773      
Increase (Decrease) in Net Investments 11,101      
Carrying Amount of Land 10,061      
Carrying Amount of Buildings and Improvements 13,874      
Total Carrying Amount 23,935      
Accumulated Depreciation $ 3,408      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 51 Greene Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,488      
Initial Cost to Company of Buildings and Improvements 8,992      
Carrying Amount of Land 4,488      
Carrying Amount of Buildings and Improvements 8,992      
Total Carrying Amount 13,480      
Accumulated Depreciation $ 187      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 53 Greene Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 3,605      
Initial Cost to Company of Buildings and Improvements 12,177      
Carrying Amount of Land 3,605      
Carrying Amount of Buildings and Improvements 12,177      
Total Carrying Amount 15,782      
Accumulated Depreciation $ 228      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 41 Greene Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 6,276      
Initial Cost to Company of Buildings and Improvements 9,582      
Carrying Amount of Land 6,276      
Carrying Amount of Buildings and Improvements 9,582      
Total Carrying Amount 15,858      
Accumulated Depreciation $ 140      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 47 Greene Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 6,265      
Initial Cost to Company of Buildings and Improvements 16,758      
Carrying Amount of Land 6,265      
Carrying Amount of Buildings and Improvements 16,758      
Total Carrying Amount 23,023      
Accumulated Depreciation $ 175      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 849 W Armitage Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 837      
Initial Cost to Company of Buildings and Improvements 2,731      
Carrying Amount of Land 837      
Carrying Amount of Buildings and Improvements 2,731      
Total Carrying Amount 3,568      
Accumulated Depreciation $ 24      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 912 W Armitage Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 982      
Initial Cost to Company of Buildings and Improvements 2,868      
Carrying Amount of Land 982      
Carrying Amount of Buildings and Improvements 2,868      
Total Carrying Amount 3,850      
Accumulated Depreciation $ 25      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Melrose Place Collection Los Angeles, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 20,490      
Initial Cost to Company of Buildings and Improvements 26,788      
Carrying Amount of Land 20,490      
Carrying Amount of Buildings and Improvements 26,788      
Total Carrying Amount 47,278      
Accumulated Depreciation $ 112      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 45 Greene Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 2,903      
Initial Cost to Company of Buildings and Improvements 8,487      
Carrying Amount of Land 2,903      
Carrying Amount of Buildings and Improvements 8,487      
Total Carrying Amount 11,390      
Accumulated Depreciation $ 39      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 565 Broadway Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements $ 22,491      
Carrying Amount of Buildings and Improvements 22,491      
Total Carrying Amount $ 22,491      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 907 W Armitage Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 700      
Initial Cost to Company of Buildings and Improvements 2,081      
Carrying Amount of Land 700      
Carrying Amount of Buildings and Improvements 2,081      
Total Carrying Amount 2,781      
Accumulated Depreciation $ 5      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund II | City Point Brooklyn, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 243,298      
Initial Cost to Company of Buildings and Improvements 100,316      
Increase (Decrease) in Net Investments 491,335      
Carrying Amount of Buildings and Improvements 591,651      
Total Carrying Amount 591,651      
Accumulated Depreciation $ 48,096      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund III | 654 Broadway Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 9,040      
Initial Cost to Company of Buildings and Improvements 3,654      
Increase (Decrease) in Net Investments 4,177      
Carrying Amount of Land 9,040      
Carrying Amount of Buildings and Improvements 7,831      
Total Carrying Amount 16,871      
Accumulated Depreciation $ 1,549      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund III | 640 Broadway Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 39,470      
Initial Cost to Company of Land 12,503      
Initial Cost to Company of Buildings and Improvements 19,960      
Increase (Decrease) in Net Investments 15,225      
Carrying Amount of Land 12,503      
Carrying Amount of Buildings and Improvements 35,185      
Total Carrying Amount 47,688      
Accumulated Depreciation $ 6,970      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund III | Cortlandt Crossing Mohegan Lake, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 28,818      
Initial Cost to Company of Land 11,000      
Increase (Decrease) in Net Investments 59,277      
Carrying Amount of Land 10,473      
Carrying Amount of Buildings and Improvements 59,804      
Total Carrying Amount 70,277      
Accumulated Depreciation $ 2,005      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 210 Bowery Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,875      
Initial Cost to Company of Buildings and Improvements 5,625      
Increase (Decrease) in Net Investments (3,950)      
Carrying Amount of Land 1,875      
Carrying Amount of Buildings and Improvements 1,675      
Total Carrying Amount 3,550      
Accumulated Depreciation $ 57      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Paramus Plaza Paramus, NJ        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 18,900      
Initial Cost to Company of Land 11,052      
Initial Cost to Company of Buildings and Improvements 7,037      
Increase (Decrease) in Net Investments 12,901      
Carrying Amount of Land 11,052      
Carrying Amount of Buildings and Improvements 19,938      
Total Carrying Amount 30,990      
Accumulated Depreciation $ 4,304      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 27 E. 61st Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,813      
Initial Cost to Company of Buildings and Improvements 14,438      
Increase (Decrease) in Net Investments 7,241      
Carrying Amount of Land 4,813      
Carrying Amount of Buildings and Improvements 21,679      
Total Carrying Amount 26,492      
Accumulated Depreciation $ 1,311      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 17 E. 71st Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 18,833      
Initial Cost to Company of Land 7,391      
Initial Cost to Company of Buildings and Improvements 20,176      
Increase (Decrease) in Net Investments 306      
Carrying Amount of Land 7,391      
Carrying Amount of Buildings and Improvements 20,482      
Total Carrying Amount 27,873      
Accumulated Depreciation $ 2,987      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 1035 Third Ave Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 12,759      
Initial Cost to Company of Buildings and Improvements 37,431      
Increase (Decrease) in Net Investments 5,541      
Carrying Amount of Land 14,099      
Carrying Amount of Buildings and Improvements 41,632      
Total Carrying Amount 55,731      
Accumulated Depreciation $ 6,070      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 801 Madison Avenue Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,178      
Initial Cost to Company of Buildings and Improvements 28,470      
Increase (Decrease) in Net Investments 5,844      
Carrying Amount of Land 4,178      
Carrying Amount of Buildings and Improvements 34,314      
Total Carrying Amount 38,492      
Accumulated Depreciation $ 2,085      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 2208-2216 Fillmore Street San Francisco, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 5,606      
Initial Cost to Company of Land 3,027      
Initial Cost to Company of Buildings and Improvements 6,376      
Increase (Decrease) in Net Investments 57      
Carrying Amount of Land 3,027      
Carrying Amount of Buildings and Improvements 6,433      
Total Carrying Amount 9,460      
Accumulated Depreciation $ 734      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 2207 Fillmore Street San Francisco, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 1,120      
Initial Cost to Company of Land 1,498      
Initial Cost to Company of Buildings and Improvements 1,735      
Increase (Decrease) in Net Investments 118      
Carrying Amount of Land 1,498      
Carrying Amount of Buildings and Improvements 1,853      
Total Carrying Amount 3,351      
Accumulated Depreciation $ 213      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 1964 Union Street San Francisco, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 1,463      
Initial Cost to Company of Land 563      
Initial Cost to Company of Buildings and Improvements 1,688      
Increase (Decrease) in Net Investments 1,867      
Carrying Amount of Land 563      
Carrying Amount of Buildings and Improvements 3,555      
Total Carrying Amount 4,118      
Accumulated Depreciation $ 230      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Restaurants at Fort Point - Boston, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 6,070      
Initial Cost to Company of Land 1,041      
Initial Cost to Company of Buildings and Improvements 10,905      
Increase (Decrease) in Net Investments 182      
Carrying Amount of Land 1,041      
Carrying Amount of Buildings and Improvements 11,087      
Total Carrying Amount 12,128      
Accumulated Depreciation $ 1,200      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Wake Forest Crossing - Wake Forest, NC        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 23,337      
Initial Cost to Company of Land 7,570      
Initial Cost to Company of Buildings and Improvements 24,829      
Increase (Decrease) in Net Investments 472      
Carrying Amount of Land 7,570      
Carrying Amount of Buildings and Improvements 25,301      
Total Carrying Amount 32,871      
Accumulated Depreciation $ 2,846      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Airport Mall - Bangor, ME        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 5,334      
Initial Cost to Company of Land 2,294      
Initial Cost to Company of Buildings and Improvements 7,067      
Increase (Decrease) in Net Investments 1,882      
Carrying Amount of Land 2,294      
Carrying Amount of Buildings and Improvements 8,949      
Total Carrying Amount 11,243      
Accumulated Depreciation $ 868      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Colonie Plaza - Albany, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 11,713      
Initial Cost to Company of Land 2,852      
Initial Cost to Company of Buildings and Improvements 9,619      
Increase (Decrease) in Net Investments 273      
Carrying Amount of Land 2,852      
Carrying Amount of Buildings and Improvements 9,892      
Total Carrying Amount 12,744      
Accumulated Depreciation $ 1,021      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Dauphin Plaza - Harrisburg, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 12,718      
Initial Cost to Company of Land 5,290      
Initial Cost to Company of Buildings and Improvements 9,464      
Increase (Decrease) in Net Investments 3,056      
Carrying Amount of Land 5,290      
Carrying Amount of Buildings and Improvements 12,520      
Total Carrying Amount 17,810      
Accumulated Depreciation $ 1,557      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Mayfair Shopping Center - Philadelphia, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 11,895      
Initial Cost to Company of Land 6,178      
Initial Cost to Company of Buildings and Improvements 9,266      
Increase (Decrease) in Net Investments 1,132      
Carrying Amount of Land 6,178      
Carrying Amount of Buildings and Improvements 10,398      
Total Carrying Amount 16,576      
Accumulated Depreciation $ 1,061      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Shaw's Plaza Waterville, ME        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 7,636      
Initial Cost to Company of Land 828      
Initial Cost to Company of Buildings and Improvements 11,814      
Increase (Decrease) in Net Investments 272      
Carrying Amount of Land 828      
Carrying Amount of Buildings and Improvements 12,086      
Total Carrying Amount 12,914      
Accumulated Depreciation $ 1,162      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Wells Plaza - Wells, ME        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 5,700      
Initial Cost to Company of Land 1,892      
Initial Cost to Company of Buildings and Improvements 2,585      
Increase (Decrease) in Net Investments 505      
Carrying Amount of Land 1,892      
Carrying Amount of Buildings and Improvements 3,090      
Total Carrying Amount 4,982      
Accumulated Depreciation $ 424      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 717 N Michigan - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 16,148      
Initial Cost to Company of Land 20,674      
Initial Cost to Company of Buildings and Improvements 10,093      
Carrying Amount of Land 20,674      
Carrying Amount of Buildings and Improvements 10,093      
Total Carrying Amount 30,767      
Accumulated Depreciation $ 843      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Shaw's Plaza North Windham, ME        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 5,702      
Initial Cost to Company of Land 1,876      
Initial Cost to Company of Buildings and Improvements 6,696      
Increase (Decrease) in Net Investments 1      
Carrying Amount of Land 1,876      
Carrying Amount of Buildings and Improvements 6,697      
Total Carrying Amount 8,573      
Accumulated Depreciation $ 509      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Lincoln Place Fairview Heights, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 23,100      
Initial Cost to Company of Land 7,149      
Initial Cost to Company of Buildings and Improvements 22,201      
Increase (Decrease) in Net Investments 2,035      
Carrying Amount of Land 7,149      
Carrying Amount of Buildings and Improvements 24,236      
Total Carrying Amount 31,385      
Accumulated Depreciation $ 2,215      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 18 E. Broughton St. Savannah, GA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 2,032      
Initial Cost to Company of Land 609      
Initial Cost to Company of Buildings and Improvements 1,513      
Carrying Amount of Land 609      
Carrying Amount of Buildings and Improvements 1,513      
Total Carrying Amount 2,122      
Accumulated Depreciation $ 51      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 20 E. Broughton St. Savannah, GA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 1,258      
Initial Cost to Company of Land 588      
Initial Cost to Company of Buildings and Improvements 937      
Carrying Amount of Land 588      
Carrying Amount of Buildings and Improvements 937      
Total Carrying Amount 1,525      
Accumulated Depreciation $ 32      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 25 E. Broughton St. Savannah, GA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 3,302      
Initial Cost to Company of Land 1,324      
Initial Cost to Company of Buildings and Improvements 2,459      
Increase (Decrease) in Net Investments 319      
Carrying Amount of Land 1,324      
Carrying Amount of Buildings and Improvements 2,778      
Total Carrying Amount 4,102      
Accumulated Depreciation $ 109      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 109 W. Broughton St. Savannah, GA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 8,809      
Initial Cost to Company of Land 2,343      
Initial Cost to Company of Buildings and Improvements 6,560      
Carrying Amount of Land 2,343      
Carrying Amount of Buildings and Improvements 6,560      
Total Carrying Amount 8,903      
Accumulated Depreciation $ 223      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 204-206 W. Broughton St. Savannah, GA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 590      
Initial Cost to Company of Land 547      
Initial Cost to Company of Buildings and Improvements 439      
Increase (Decrease) in Net Investments 45      
Carrying Amount of Land 547      
Carrying Amount of Buildings and Improvements 484      
Total Carrying Amount 1,031      
Accumulated Depreciation $ 15      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 216-218 W. Broughton St. Savannah, GA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 3,674      
Initial Cost to Company of Land 1,160      
Initial Cost to Company of Buildings and Improvements 2,736      
Increase (Decrease) in Net Investments 17      
Carrying Amount of Land 1,160      
Carrying Amount of Buildings and Improvements 2,753      
Total Carrying Amount 3,913      
Accumulated Depreciation $ 94      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 220 W. Broughton St. Savannah, GA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 2,416      
Initial Cost to Company of Land 619      
Initial Cost to Company of Buildings and Improvements 1,799      
Carrying Amount of Land 619      
Carrying Amount of Buildings and Improvements 1,799      
Total Carrying Amount 2,418      
Accumulated Depreciation $ 61      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 223 W. Broughton St. Savannah, GA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 924      
Initial Cost to Company of Land 465      
Initial Cost to Company of Buildings and Improvements 688      
Carrying Amount of Land 465      
Carrying Amount of Buildings and Improvements 688      
Total Carrying Amount 1,153      
Accumulated Depreciation $ 24      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 226-228 W. Broughton St. Savannah, GA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 2,551      
Initial Cost to Company of Land 660      
Initial Cost to Company of Buildings and Improvements 1,900      
Carrying Amount of Land 660      
Carrying Amount of Buildings and Improvements 1,900      
Total Carrying Amount 2,560      
Accumulated Depreciation $ 64      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 309/311 W. Broughton St. Savannah, GA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 3,619      
Initial Cost to Company of Land 1,160      
Initial Cost to Company of Buildings and Improvements 2,695      
Carrying Amount of Land 1,160      
Carrying Amount of Buildings and Improvements 2,695      
Total Carrying Amount 3,855      
Accumulated Depreciation $ 91      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 110 University Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements $ 1,370      
Carrying Amount of Buildings and Improvements 1,370      
Total Carrying Amount 1,370      
Accumulated Depreciation $ 25      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | Plaza Santa Fe Santa Fe, NM        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 22,893      
Initial Cost to Company of Buildings and Improvements 28,214      
Increase (Decrease) in Net Investments 360      
Carrying Amount of Buildings and Improvements 28,574      
Total Carrying Amount 28,574      
Accumulated Depreciation $ 2,047      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | Hickory Ridge - Hickory, NC        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 30,000      
Initial Cost to Company of Land 7,852      
Initial Cost to Company of Buildings and Improvements 29,998      
Increase (Decrease) in Net Investments 1,350      
Carrying Amount of Land 7,852      
Carrying Amount of Buildings and Improvements 31,348      
Total Carrying Amount 39,200      
Accumulated Depreciation $ 2,120      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | New Towne Plaza - Canton, MI        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 16,900      
Initial Cost to Company of Land 5,040      
Initial Cost to Company of Buildings and Improvements 17,391      
Increase (Decrease) in Net Investments 59      
Carrying Amount of Land 5,040      
Carrying Amount of Buildings and Improvements 17,450      
Total Carrying Amount 22,490      
Accumulated Depreciation $ 1,210      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | Fairlane Green Allen Park, MI        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 40,300      
Initial Cost to Company of Land 18,121      
Initial Cost to Company of Buildings and Improvements 37,143      
Increase (Decrease) in Net Investments 256      
Carrying Amount of Land 18,121      
Carrying Amount of Buildings and Improvements 37,399      
Total Carrying Amount 55,520      
Accumulated Depreciation $ 2,059      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | Trussville Promenade Birmingham, AL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 29,370      
Initial Cost to Company of Land 7,587      
Initial Cost to Company of Buildings and Improvements 34,285      
Increase (Decrease) in Net Investments 36      
Carrying Amount of Land 7,587      
Carrying Amount of Buildings and Improvements 34,321      
Total Carrying Amount 41,908      
Accumulated Depreciation $ 1,713      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | Elk Grove Commons Elk Grove, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 41,500      
Initial Cost to Company of Land 6,204      
Initial Cost to Company of Buildings and Improvements 48,008      
Increase (Decrease) in Net Investments 70      
Carrying Amount of Land 6,204      
Carrying Amount of Buildings and Improvements 48,078      
Total Carrying Amount 54,282      
Accumulated Depreciation $ 1,786      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | Hiram Pavilion Hiram, GA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 28,830      
Initial Cost to Company of Land 13,029      
Initial Cost to Company of Buildings and Improvements 25,446      
Increase (Decrease) in Net Investments 56      
Carrying Amount of Land 13,029      
Carrying Amount of Buildings and Improvements 25,502      
Total Carrying Amount 38,531      
Accumulated Depreciation $ 964      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | Palm Coast Landing Palm Coast, FL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 26,500      
Initial Cost to Company of Land 7,066      
Initial Cost to Company of Buildings and Improvements 27,299      
Carrying Amount of Land 7,066      
Carrying Amount of Buildings and Improvements 27,299      
Total Carrying Amount 34,365      
Accumulated Depreciation $ 554      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | Lincoln Commons Lincoln, RI        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 38,820      
Initial Cost to Company of Land 14,429      
Initial Cost to Company of Buildings and Improvements 34,417      
Increase (Decrease) in Net Investments 170      
Carrying Amount of Land 14,429      
Carrying Amount of Buildings and Improvements 34,587      
Total Carrying Amount 49,016      
Accumulated Depreciation $ 517      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | Landstown Commons Virginia Beach, VA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 60,900      
Initial Cost to Company of Land 10,221      
Initial Cost to Company of Buildings and Improvements 69,005      
Increase (Decrease) in Net Investments 166      
Carrying Amount of Land 10,221      
Carrying Amount of Buildings and Improvements 69,171      
Total Carrying Amount 79,392      
Accumulated Depreciation $ 766      
Life on which Depreciation in Latest Statement of Income is Compared 40 years