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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 1,125,356      
Initial Cost to Company of Land 867,524      
Initial Cost to Company of Buildings and Improvements 2,395,406      
Increase (Decrease) in Net Investments 831,358      
Carrying Amount of Land 859,421      
Carrying Amount of Buildings and Improvements 3,234,867      
Total Carrying Amount 4,094,288 $ 4,039,536 $ 3,697,805 $ 3,466,482
Accumulated Depreciation 586,800 490,227 $ 416,657 $ 339,862
Unamortized Loan Costs (6,507)      
Unamortized Premium 548 651    
Real estate, federal income tax basis 4,200,000      
Right-of-use assets - operating leases, net $ 76,268 $ 60,006    
Buildings        
Real Estate And Accumulated Depreciation [Line Items]        
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Real Estate Under Development        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 37,190      
Initial Cost to Company of Land 73,469      
Initial Cost to Company of Buildings and Improvements 25,347      
Increase (Decrease) in Net Investments 148,533      
Carrying Amount of Land 83,146      
Carrying Amount of Buildings and Improvements 164,203      
Total Carrying Amount 247,349      
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 3,357      
Carrying Amount of Land 1,147      
Carrying Amount of Buildings and Improvements 10,782      
Total Carrying Amount 11,929      
Accumulated Depreciation $ 8,766      
Life on which Depreciation in Latest Statement of Operations 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 14,736      
Carrying Amount of Land 505      
Carrying Amount of Buildings and Improvements 18,897      
Total Carrying Amount 19,402      
Accumulated Depreciation $ 16,143      
Life on which Depreciation in Latest Statement of Operations 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 $ 3,074      
Life on which Depreciation in Latest Statement of Operations 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 $ 5,298      
Life on which Depreciation in Latest Statement of Operations 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 12,515      
Carrying Amount of Land 1,664      
Carrying Amount of Buildings and Improvements 12,515      
Total Carrying Amount 14,179      
Accumulated Depreciation $ 10,658      
Life on which Depreciation in Latest Statement of Operations 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 $ 4,444      
Life on which Depreciation in Latest Statement of Operations 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 22,705      
Carrying Amount of Land 3,207      
Carrying Amount of Buildings and Improvements 36,479      
Total Carrying Amount 39,686      
Accumulated Depreciation $ 25,390      
Life on which Depreciation in Latest Statement of Operations 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 18,143      
Carrying Amount of Land 3,798      
Carrying Amount of Buildings and Improvements 30,585      
Total Carrying Amount 34,383      
Accumulated Depreciation $ 20,969      
Life on which Depreciation in Latest Statement of Operations 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 6,269      
Carrying Amount of Land 4,288      
Carrying Amount of Buildings and Improvements 23,421      
Total Carrying Amount 27,709      
Accumulated Depreciation $ 14,854      
Life on which Depreciation in Latest Statement of Operations 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 5,193      
Carrying Amount of Land 2,577      
Carrying Amount of Buildings and Improvements 15,483      
Total Carrying Amount 18,060      
Accumulated Depreciation $ 9,548      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Core Portfolio | 239 Greenwich Avenue Greenwich, CT        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 26,212      
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 $ 9,190      
Life on which Depreciation in Latest Statement of Operations 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 5,308      
Carrying Amount of Land 1,793      
Carrying Amount of Buildings and Improvements 12,480      
Total Carrying Amount 14,273      
Accumulated Depreciation $ 6,374      
Life on which Depreciation in Latest Statement of Operations 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 5,238      
Carrying Amount of Land 3,229      
Carrying Amount of Buildings and Improvements 18,155      
Total Carrying Amount 21,384      
Accumulated Depreciation $ 11,063      
Life on which Depreciation in Latest Statement of Operations 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 8,008      
Carrying Amount of Land 907      
Carrying Amount of Buildings and Improvements 11,489      
Total Carrying Amount 12,396      
Accumulated Depreciation $ 9,505      
Life on which Depreciation in Latest Statement of Operations 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 16,470      
Carrying Amount of Land 3,401      
Carrying Amount of Buildings and Improvements 28,770      
Total Carrying Amount 32,171      
Accumulated Depreciation $ 15,894      
Life on which Depreciation in Latest Statement of Operations 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 $ 3,057      
Life on which Depreciation in Latest Statement of Operations 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 12,751      
Carrying Amount of Land 1,273      
Carrying Amount of Buildings and Improvements 17,842      
Total Carrying Amount 19,115      
Accumulated Depreciation $ 11,258      
Life on which Depreciation in Latest Statement of Operations 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 2,254      
Carrying Amount of Land 2,350      
Carrying Amount of Buildings and Improvements 11,658      
Total Carrying Amount 14,008      
Accumulated Depreciation $ 6,827      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Core Portfolio | Brandywine Portfolio        
Real Estate And Accumulated Depreciation [Line Items]        
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 $ 8,002      
Life on which Depreciation in Latest Statement of Operations 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 1,331      
Carrying Amount of Land 1,691      
Carrying Amount of Buildings and Improvements 7,134      
Total Carrying Amount 8,825      
Accumulated Depreciation $ 3,647      
Life on which Depreciation in Latest Statement of Operations 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 3,195      
Carrying Amount of Buildings and Improvements 15,104      
Total Carrying Amount 15,104      
Accumulated Depreciation $ 8,911      
Life on which Depreciation in Latest Statement of Operations 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 $ 5,372      
Life on which Depreciation in Latest Statement of Operations 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 5,231      
Carrying Amount of Land 11,855      
Carrying Amount of Buildings and Improvements 12,522      
Total Carrying Amount 24,377      
Accumulated Depreciation $ 3,778      
Life on which Depreciation in Latest Statement of Operations 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 62      
Carrying Amount of Land 3,380      
Carrying Amount of Buildings and Improvements 13,561      
Total Carrying Amount 16,941      
Accumulated Depreciation $ 5,259      
Life on which Depreciation in Latest Statement of Operations 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 1,308      
Carrying Amount of Land 16,699      
Carrying Amount of Buildings and Improvements 20,012      
Total Carrying Amount 36,711      
Accumulated Depreciation $ 7,290      
Life on which Depreciation in Latest Statement of Operations 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 6,145      
Carrying Amount of Land 3,048      
Carrying Amount of Buildings and Improvements 13,426      
Total Carrying Amount 16,474      
Accumulated Depreciation $ 8,502      
Life on which Depreciation in Latest Statement of Operations 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 15      
Carrying Amount of Land 8,576      
Carrying Amount of Buildings and Improvements 17,271      
Total Carrying Amount 25,847      
Accumulated Depreciation $ 4,136      
Life on which Depreciation in Latest Statement of Operations 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 $ 590      
Life on which Depreciation in Latest Statement of Operations 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 $ 1,179      
Life on which Depreciation in Latest Statement of Operations 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 2,666      
Carrying Amount of Land 994      
Carrying Amount of Buildings and Improvements 8,792      
Total Carrying Amount 9,786      
Accumulated Depreciation $ 534      
Life on which Depreciation in Latest Statement of Operations 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 $ 647      
Life on which Depreciation in Latest Statement of Operations 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 $ 451      
Life on which Depreciation in Latest Statement of Operations 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 $ 366      
Life on which Depreciation in Latest Statement of Operations 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 $ 187      
Life on which Depreciation in Latest Statement of Operations 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 $ 688      
Life on which Depreciation in Latest Statement of Operations 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 2,209      
Carrying Amount of Land 7,458      
Carrying Amount of Buildings and Improvements 18,177      
Total Carrying Amount 25,635      
Accumulated Depreciation $ 4,615      
Life on which Depreciation in Latest Statement of Operations 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 $ 114      
Life on which Depreciation in Latest Statement of Operations 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 $ 3,191      
Life on which Depreciation in Latest Statement of Operations 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 $ 682      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Core Portfolio | 28 Jericho Turnpike Westbury, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 12,895      
Initial Cost to Company of Land 6,220      
Initial Cost to Company of Buildings and Improvements 24,416      
Increase (Decrease) in Net Investments 34      
Carrying Amount of Land 6,220      
Carrying Amount of Buildings and Improvements 24,450      
Total Carrying Amount 30,670      
Accumulated Depreciation $ 5,496      
Life on which Depreciation in Latest Statement of Operations 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 711      
Carrying Amount of Land 1,480      
Carrying Amount of Buildings and Improvements 4,049      
Total Carrying Amount 5,529      
Accumulated Depreciation $ 890      
Life on which Depreciation in Latest Statement of Operations 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 $ 2,613      
Life on which Depreciation in Latest Statement of Operations 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 $ 1,119      
Life on which Depreciation in Latest Statement of Operations 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      
Increase (Decrease) in Net Investments 1      
Carrying Amount of Land 1,754      
Carrying Amount of Buildings and Improvements 9,201      
Total Carrying Amount 10,955      
Accumulated Depreciation $ 1,955      
Life on which Depreciation in Latest Statement of Operations 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 $ 961      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Core Portfolio | 60 Orange Street        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 6,727      
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 $ 2,454      
Life on which Depreciation in Latest Statement of Operations 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 576      
Carrying Amount of Land 2,848      
Carrying Amount of Buildings and Improvements 13,270      
Total Carrying Amount 16,118      
Accumulated Depreciation $ 2,985      
Life on which Depreciation in Latest Statement of Operations 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 1,167      
Carrying Amount of Land 11,690      
Carrying Amount of Buildings and Improvements 11,302      
Total Carrying Amount 22,992      
Accumulated Depreciation $ 2,567      
Life on which Depreciation in Latest Statement of Operations 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 $ 324      
Life on which Depreciation in Latest Statement of Operations 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 1,082      
Carrying Amount of Land 4,429      
Carrying Amount of Buildings and Improvements 7,184      
Total Carrying Amount 11,613      
Accumulated Depreciation $ 1,735      
Life on which Depreciation in Latest Statement of Operations 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 $ 471      
Life on which Depreciation in Latest Statement of Operations 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      
Increase (Decrease) in Net Investments 302      
Carrying Amount of Land 15,240      
Carrying Amount of Buildings and Improvements 65,633      
Total Carrying Amount 80,873      
Accumulated Depreciation $ 12,866      
Life on which Depreciation in Latest Statement of Operations 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 $ 258      
Life on which Depreciation in Latest Statement of Operations 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 977      
Carrying Amount of Land 5,398      
Carrying Amount of Buildings and Improvements 16,578      
Total Carrying Amount 21,976      
Accumulated Depreciation $ 3,425      
Life on which Depreciation in Latest Statement of Operations 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 $ 127      
Life on which Depreciation in Latest Statement of Operations 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 $ 965      
Life on which Depreciation in Latest Statement of Operations 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 1,357      
Carrying Amount of Land 2,137      
Carrying Amount of Buildings and Improvements 2,946      
Total Carrying Amount 5,083      
Accumulated Depreciation $ 587      
Life on which Depreciation in Latest Statement of Operations 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 $ 1,637      
Life on which Depreciation in Latest Statement of Operations 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 43      
Carrying Amount of Land 1,318      
Carrying Amount of Buildings and Improvements 8,511      
Total Carrying Amount 9,829      
Accumulated Depreciation $ 1,717      
Life on which Depreciation in Latest Statement of Operations 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 $ 1,563      
Life on which Depreciation in Latest Statement of Operations 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 142      
Carrying Amount of Land 790      
Carrying Amount of Buildings and Improvements 1,408      
Total Carrying Amount 2,198      
Accumulated Depreciation $ 386      
Life on which Depreciation in Latest Statement of Operations 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 1,167      
Carrying Amount of Buildings and Improvements 33,986      
Total Carrying Amount 33,986      
Accumulated Depreciation $ 4,009      
Life on which Depreciation in Latest Statement of Operations 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 784      
Carrying Amount of Land 16,744      
Carrying Amount of Buildings and Improvements 29,130      
Total Carrying Amount 45,874      
Accumulated Depreciation $ 5,124      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Core Portfolio | 330-340 River St Cambridge, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 10,875      
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 $ 3,282      
Life on which Depreciation in Latest Statement of Operations 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 1,740      
Carrying Amount of Land 4,578      
Carrying Amount of Buildings and Improvements 4,385      
Total Carrying Amount 8,963      
Accumulated Depreciation $ 601      
Life on which Depreciation in Latest Statement of Operations 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 3,729      
Carrying Amount of Land 1,893      
Carrying Amount of Buildings and Improvements 15,323      
Total Carrying Amount 17,216      
Accumulated Depreciation $ 1,983      
Life on which Depreciation in Latest Statement of Operations 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 177      
Carrying Amount of Land 8,544      
Carrying Amount of Buildings and Improvements 27,178      
Total Carrying Amount 35,722      
Accumulated Depreciation $ 4,615      
Life on which Depreciation in Latest Statement of Operations 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 $ 1,855      
Life on which Depreciation in Latest Statement of Operations 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 958      
Carrying Amount of Land 10,175      
Carrying Amount of Buildings and Improvements 13,599      
Total Carrying Amount 23,774      
Accumulated Depreciation $ 2,404      
Life on which Depreciation in Latest Statement of Operations 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 4,445      
Carrying Amount of Land 13,763      
Carrying Amount of Buildings and Improvements 35,837      
Total Carrying Amount 49,600      
Accumulated Depreciation $ 6,381      
Life on which Depreciation in Latest Statement of Operations 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 592      
Carrying Amount of Buildings and Improvements 58,128      
Total Carrying Amount 58,128      
Accumulated Depreciation $ 17,475      
Life on which Depreciation in Latest Statement of Operations 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 1,814      
Carrying Amount of Land 20,264      
Carrying Amount of Buildings and Improvements 34,945      
Total Carrying Amount 55,209      
Accumulated Depreciation $ 5,580      
Life on which Depreciation in Latest Statement of Operations 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 $ 768      
Life on which Depreciation in Latest Statement of Operations 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 (20,435)      
Carrying Amount of Land 26,386      
Carrying Amount of Buildings and Improvements 98,340      
Total Carrying Amount 124,726      
Accumulated Depreciation $ 17,050      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Core Portfolio | 163 Highland Avenue Needham, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 8,298      
Initial Cost to Company of Land 12,679      
Initial Cost to Company of Buildings and Improvements 11,213      
Increase (Decrease) in Net Investments (107)      
Carrying Amount of Land 12,529      
Carrying Amount of Buildings and Improvements 11,256      
Total Carrying Amount 23,785      
Accumulated Depreciation $ 1,775      
Life on which Depreciation in Latest Statement of Operations 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 79      
Carrying Amount of Land 4,838      
Carrying Amount of Buildings and Improvements 14,653      
Total Carrying Amount 19,491      
Accumulated Depreciation $ 1,957      
Life on which Depreciation in Latest Statement of Operations 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 $ 1,463      
Life on which Depreciation in Latest Statement of Operations 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 $ 464      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Core Portfolio | Concord & Milwaukee - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 2,568      
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 $ 380      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Core Portfolio | State & Washington - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 23,298      
Initial Cost to Company of Land 3,907      
Initial Cost to Company of Buildings and Improvements 70,943      
Increase (Decrease) in Net Investments 6,225      
Carrying Amount of Land 3,907      
Carrying Amount of Buildings and Improvements 77,168      
Total Carrying Amount 81,075      
Accumulated Depreciation $ 8,505      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Core Portfolio | 151 N. State Street Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 13,253      
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 $ 2,819      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Core Portfolio | North & Kingsbury - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 11,756      
Initial Cost to Company of Land 18,731      
Initial Cost to Company of Buildings and Improvements 16,292      
Increase (Decrease) in Net Investments 664      
Carrying Amount of Land 18,731      
Carrying Amount of Buildings and Improvements 16,956      
Total Carrying Amount 35,687      
Accumulated Depreciation $ 1,868      
Life on which Depreciation in Latest Statement of Operations 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 1,481      
Carrying Amount of Land 13,443      
Carrying Amount of Buildings and Improvements 138,808      
Total Carrying Amount 152,251      
Accumulated Depreciation $ 15,288      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Core Portfolio | California & Armitage - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 2,428      
Initial Cost to Company of Land 6,770      
Initial Cost to Company of Buildings and Improvements 2,292      
Increase (Decrease) in Net Investments 4      
Carrying Amount of Land 6,770      
Carrying Amount of Buildings and Improvements 2,296      
Total Carrying Amount 9,066      
Accumulated Depreciation $ 274      
Life on which Depreciation in Latest Statement of Operations 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 278      
Carrying Amount of Land 75,591      
Carrying Amount of Buildings and Improvements 73,546      
Total Carrying Amount 149,137      
Accumulated Depreciation $ 7,707      
Life on which Depreciation in Latest Statement of Operations 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 312      
Carrying Amount of Land 8,100      
Carrying Amount of Buildings and Improvements 31,533      
Total Carrying Amount 39,633      
Accumulated Depreciation $ 2,680      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
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 (75,359)      
Carrying Amount of Buildings and Improvements 1,606      
Total Carrying Amount 1,606      
Accumulated Depreciation $ 359      
Life on which Depreciation in Latest Statement of Operations 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 11,123      
Carrying Amount of Land 10,061      
Carrying Amount of Buildings and Improvements 13,896      
Total Carrying Amount 23,957      
Accumulated Depreciation $ 3,689      
Life on which Depreciation in Latest Statement of Operations 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 $ 412      
Life on which Depreciation in Latest Statement of Operations 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 $ 533      
Life on which Depreciation in Latest Statement of Operations 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 $ 379      
Life on which Depreciation in Latest Statement of Operations 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 $ 594      
Life on which Depreciation in Latest Statement of Operations 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 $ 96      
Life on which Depreciation in Latest Statement of Operations 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 $ 100      
Life on which Depreciation in Latest Statement of Operations 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 $ 784      
Life on which Depreciation in Latest Statement of Operations 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      
Increase (Decrease) in Net Investments 2      
Carrying Amount of Land 2,903      
Carrying Amount of Buildings and Improvements 8,489      
Total Carrying Amount 11,392      
Accumulated Depreciation $ 248      
Life on which Depreciation in Latest Statement of Operations 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      
Increase (Decrease) in Net Investments 12      
Carrying Amount of Buildings and Improvements 22,503      
Total Carrying Amount 22,503      
Accumulated Depreciation $ 609      
Life on which Depreciation in Latest Statement of Operations 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 $ 62      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Core Portfolio | 37 Greene Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 6,721      
Initial Cost to Company of Buildings and Improvements 9,119      
Carrying Amount of Land 6,721      
Carrying Amount of Buildings and Improvements 9,119      
Total Carrying Amount 15,840      
Accumulated Depreciation $ 228      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Core Portfolio | 917 W Armitage Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 901      
Initial Cost to Company of Buildings and Improvements 2,368      
Carrying Amount of Land 901      
Carrying Amount of Buildings and Improvements 2,368      
Total Carrying Amount 3,269      
Accumulated Depreciation $ 59      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Core Portfolio | Brandywine Town Center Wilmington, DE        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 15,632      
Initial Cost to Company of Buildings and Improvements 101,861      
Increase (Decrease) in Net Investments 72      
Carrying Amount of Land 15,632      
Carrying Amount of Buildings and Improvements 101,933      
Total Carrying Amount 117,565      
Accumulated Depreciation $ 2,192      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund II | City Point Brooklyn, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 247,086      
Initial Cost to Company of Buildings and Improvements 100,316      
Increase (Decrease) in Net Investments 466,763      
Carrying Amount of Buildings and Improvements 567,079      
Total Carrying Amount 567,079      
Accumulated Depreciation $ 76,384      
Life on which Depreciation in Latest Statement of Operations 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 (2,126)      
Carrying Amount of Land 5,034      
Carrying Amount of Buildings and Improvements 5,534      
Total Carrying Amount 10,568      
Accumulated Depreciation $ 1,853      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund III | 640 Broadway Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 35,970      
Initial Cost to Company of Land 12,503      
Initial Cost to Company of Buildings and Improvements 19,960      
Increase (Decrease) in Net Investments 16,526      
Carrying Amount of Land 12,503      
Carrying Amount of Buildings and Improvements 36,486      
Total Carrying Amount 48,989      
Accumulated Depreciation $ 8,203      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund III | Cortlandt Crossing, Mohegan Lake, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 35,948      
Initial Cost to Company of Land 11,000      
Increase (Decrease) in Net Investments 41,666      
Carrying Amount of Land 8,648      
Carrying Amount of Buildings and Improvements 44,018      
Total Carrying Amount 52,666      
Accumulated Depreciation $ 3,162      
Life on which Depreciation in Latest Statement of Operations 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 (3,500)      
Carrying Amount of Land 1,875      
Carrying Amount of Buildings and Improvements 2,125      
Total Carrying Amount 4,000      
Accumulated Depreciation $ 109      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund IV | Paramus Plaza Paramus, NJ        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 20,810      
Initial Cost to Company of Land 11,052      
Initial Cost to Company of Buildings and Improvements 7,037      
Increase (Decrease) in Net Investments 14,946      
Carrying Amount of Land 11,052      
Carrying Amount of Buildings and Improvements 21,983      
Total Carrying Amount 33,035      
Accumulated Depreciation $ 5,160      
Life on which Depreciation in Latest Statement of Operations 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 8,424      
Carrying Amount of Land 4,813      
Carrying Amount of Buildings and Improvements 22,862      
Total Carrying Amount 27,675      
Accumulated Depreciation $ 1,781      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund IV | 17 E. 71st Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 15,385      
Initial Cost to Company of Land 7,391      
Initial Cost to Company of Buildings and Improvements 20,176      
Increase (Decrease) in Net Investments 322      
Carrying Amount of Land 7,391      
Carrying Amount of Buildings and Improvements 20,498      
Total Carrying Amount 27,889      
Accumulated Depreciation $ 3,281      
Life on which Depreciation in Latest Statement of Operations 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 5,753      
Carrying Amount of Land 14,099      
Carrying Amount of Buildings and Improvements 41,844      
Total Carrying Amount 55,943      
Accumulated Depreciation $ 6,880      
Life on which Depreciation in Latest Statement of Operations 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 (5,185)      
Carrying Amount of Land 2,922      
Carrying Amount of Buildings and Improvements 24,541      
Total Carrying Amount 27,463      
Accumulated Depreciation $ 2,599      
Life on which Depreciation in Latest Statement of Operations 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 137      
Carrying Amount of Land 3,027      
Carrying Amount of Buildings and Improvements 6,513      
Total Carrying Amount 9,540      
Accumulated Depreciation $ 840      
Life on which Depreciation in Latest Statement of Operations 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 125      
Carrying Amount of Land 1,498      
Carrying Amount of Buildings and Improvements 1,860      
Total Carrying Amount 3,358      
Accumulated Depreciation $ 249      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund IV | 1964 Union Street San Francisco, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 1,456      
Initial Cost to Company of Land 563      
Initial Cost to Company of Buildings and Improvements 1,688      
Increase (Decrease) in Net Investments 2,056      
Carrying Amount of Land 563      
Carrying Amount of Buildings and Improvements 3,744      
Total Carrying Amount 4,307      
Accumulated Depreciation $ 305      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund IV | Restaurants at Fort Point - Boston, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 5,958      
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 $ 1,391      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund IV | Wake Forest Crossing - Wake Forest, NC        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 22,949      
Initial Cost to Company of Land 7,570      
Initial Cost to Company of Buildings and Improvements 24,829      
Increase (Decrease) in Net Investments 574      
Carrying Amount of Land 7,570      
Carrying Amount of Buildings and Improvements 25,403      
Total Carrying Amount 32,973      
Accumulated Depreciation $ 3,438      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund IV | Airport Mall - Bangor, ME        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 5,186      
Initial Cost to Company of Land 2,294      
Initial Cost to Company of Buildings and Improvements 7,067      
Increase (Decrease) in Net Investments 2,534      
Carrying Amount of Land 2,006      
Carrying Amount of Buildings and Improvements 9,889      
Total Carrying Amount 11,895      
Accumulated Depreciation $ 1,193      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund IV | Dauphin Plaza - Harrisburg, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 12,466      
Initial Cost to Company of Land 5,290      
Initial Cost to Company of Buildings and Improvements 9,464      
Increase (Decrease) in Net Investments 3,069      
Carrying Amount of Land 5,290      
Carrying Amount of Buildings and Improvements 12,533      
Total Carrying Amount 17,823      
Accumulated Depreciation $ 2,089      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund IV | Mayfair Shopping Center - Philadelphia, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 11,597      
Initial Cost to Company of Land 6,178      
Initial Cost to Company of Buildings and Improvements 9,266      
Increase (Decrease) in Net Investments 1,095      
Carrying Amount of Land 6,178      
Carrying Amount of Buildings and Improvements 10,361      
Total Carrying Amount 16,539      
Accumulated Depreciation $ 1,344      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund IV | Shaw's Plaza Waterville, ME        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 7,478      
Initial Cost to Company of Land 828      
Initial Cost to Company of Buildings and Improvements 11,814      
Increase (Decrease) in Net Investments 271      
Carrying Amount of Land 828      
Carrying Amount of Buildings and Improvements 12,085      
Total Carrying Amount 12,913      
Accumulated Depreciation $ 1,418      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund IV | Wells Plaza - Wells, ME        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 5,587      
Initial Cost to Company of Land 1,892      
Initial Cost to Company of Buildings and Improvements 2,585      
Increase (Decrease) in Net Investments 484      
Carrying Amount of Land 1,892      
Carrying Amount of Buildings and Improvements 3,069      
Total Carrying Amount 4,961      
Accumulated Depreciation $ 540      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund IV | 717 N Michigan - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 14,810      
Initial Cost to Company of Land 20,674      
Initial Cost to Company of Buildings and Improvements 10,093      
Increase (Decrease) in Net Investments (4,251)      
Carrying Amount of Land 17,652      
Carrying Amount of Buildings and Improvements 8,864      
Total Carrying Amount 26,516      
Accumulated Depreciation $ 1,021      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund IV | Shaw's Plaza North Windham, ME        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 5,551      
Initial Cost to Company of Land 1,876      
Initial Cost to Company of Buildings and Improvements 6,696      
Increase (Decrease) in Net Investments 56      
Carrying Amount of Land 1,876      
Carrying Amount of Buildings and Improvements 6,752      
Total Carrying Amount 8,628      
Accumulated Depreciation $ 657      
Life on which Depreciation in Latest Statement of Operations 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 2,098      
Carrying Amount of Land 7,149      
Carrying Amount of Buildings and Improvements 24,299      
Total Carrying Amount 31,448      
Accumulated Depreciation $ 2,872      
Life on which Depreciation in Latest Statement of Operations 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      
Increase (Decrease) in Net Investments 22      
Carrying Amount of Land 609      
Carrying Amount of Buildings and Improvements 1,535      
Total Carrying Amount 2,144      
Accumulated Depreciation $ 87      
Life on which Depreciation in Latest Statement of Operations 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 $ 53      
Life on which Depreciation in Latest Statement of Operations 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 362      
Carrying Amount of Land 1,324      
Carrying Amount of Buildings and Improvements 2,821      
Total Carrying Amount 4,145      
Accumulated Depreciation $ 197      
Life on which Depreciation in Latest Statement of Operations 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      
Increase (Decrease) in Net Investments 271      
Carrying Amount of Land 2,343      
Carrying Amount of Buildings and Improvements 6,831      
Total Carrying Amount 9,174      
Accumulated Depreciation $ 387      
Life on which Depreciation in Latest Statement of Operations 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 $ 30      
Life on which Depreciation in Latest Statement of Operations 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 2,179      
Carrying Amount of Land 1,160      
Carrying Amount of Buildings and Improvements 4,915      
Total Carrying Amount 6,075      
Accumulated Depreciation $ 218      
Life on which Depreciation in Latest Statement of Operations 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      
Increase (Decrease) in Net Investments 1,109      
Carrying Amount of Land 619      
Carrying Amount of Buildings and Improvements 2,908      
Total Carrying Amount 3,527      
Accumulated Depreciation $ 165      
Life on which Depreciation in Latest Statement of Operations 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 $ 39      
Life on which Depreciation in Latest Statement of Operations 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      
Increase (Decrease) in Net Investments 34      
Carrying Amount of Land 660      
Carrying Amount of Buildings and Improvements 1,934      
Total Carrying Amount 2,594      
Accumulated Depreciation $ 110      
Life on which Depreciation in Latest Statement of Operations 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 $ 152      
Life on which Depreciation in Latest Statement of Operations 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      
Increase (Decrease) in Net Investments (361)      
Carrying Amount of Buildings and Improvements 1,009      
Total Carrying Amount 1,009      
Accumulated Depreciation $ 60      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund IV | 230-240 W. Broughton St. Savannah, GA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 2,185      
Initial Cost to Company of Buildings and Improvements 9,597      
Increase (Decrease) in Net Investments 4      
Carrying Amount of Land 2,185      
Carrying Amount of Buildings and Improvements 9,601      
Total Carrying Amount 11,786      
Accumulated Depreciation $ 140      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund IV | 102 E. Broughton St. Savannah, GA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements $ 514      
Carrying Amount of Buildings and Improvements 514      
Total Carrying Amount 514      
Accumulated Depreciation $ 7      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund IV | 146 Geary St. San Francisco, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 22,900      
Initial Cost to Company of Land 9,500      
Initial Cost to Company of Buildings and Improvements 28,500      
Increase (Decrease) in Net Investments (227)      
Carrying Amount of Land 8,037      
Carrying Amount of Buildings and Improvements 29,736      
Total Carrying Amount 37,773      
Accumulated Depreciation $ 186      
Life on which Depreciation in Latest Statement of Operations 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 680      
Carrying Amount of Buildings and Improvements 28,894      
Total Carrying Amount 28,894      
Accumulated Depreciation $ 2,886      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund V | Hickory Ridge - Hickory, NC        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 29,876      
Initial Cost to Company of Land 7,852      
Initial Cost to Company of Buildings and Improvements 29,998      
Increase (Decrease) in Net Investments 1,472      
Carrying Amount of Land 7,852      
Carrying Amount of Buildings and Improvements 31,470      
Total Carrying Amount 39,322      
Accumulated Depreciation $ 3,140      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years      
Opportunity Funds | Fund V | New Towne Plaza - Canton, MI        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 16,688      
Initial Cost to Company of Land 5,040      
Initial Cost to Company of Buildings and Improvements 17,391      
Increase (Decrease) in Net Investments 726      
Carrying Amount of Land 5,040      
Carrying Amount of Buildings and Improvements 18,117      
Total Carrying Amount 23,157      
Accumulated Depreciation $ 1,756      
Life on which Depreciation in Latest Statement of Operations 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 4      
Carrying Amount of Land 18,121      
Carrying Amount of Buildings and Improvements 37,467      
Total Carrying Amount 55,588      
Accumulated Depreciation $ 3,096      
Life on which Depreciation in Latest Statement of Operations 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 43      
Carrying Amount of Land 7,587      
Carrying Amount of Buildings and Improvements 34,328      
Total Carrying Amount 41,915      
Accumulated Depreciation $ 2,652      
Life on which Depreciation in Latest Statement of Operations 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 494      
Carrying Amount of Land 6,204      
Carrying Amount of Buildings and Improvements 48,502      
Total Carrying Amount 54,706      
Accumulated Depreciation $ 3,079      
Life on which Depreciation in Latest Statement of Operations 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 259      
Carrying Amount of Land 13,029      
Carrying Amount of Buildings and Improvements 25,705      
Total Carrying Amount 38,734      
Accumulated Depreciation $ 1,800      
Life on which Depreciation in Latest Statement of Operations 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      
Increase (Decrease) in Net Investments 314      
Carrying Amount of Land 7,066      
Carrying Amount of Buildings and Improvements 27,613      
Total Carrying Amount 34,679      
Accumulated Depreciation $ 1,393      
Life on which Depreciation in Latest Statement of Operations 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 316      
Carrying Amount of Land 14,429      
Carrying Amount of Buildings and Improvements 34,733      
Total Carrying Amount 49,162      
Accumulated Depreciation $ 1,561      
Life on which Depreciation in Latest Statement of Operations 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 10,222      
Initial Cost to Company of Buildings and Improvements 69,005      
Increase (Decrease) in Net Investments 676      
Carrying Amount of Land 10,222      
Carrying Amount of Buildings and Improvements 69,681      
Total Carrying Amount 79,903      
Accumulated Depreciation $ 2,632      
Life on which Depreciation in Latest Statement of Operations is Compared 40 years