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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,050,051      
Initial Cost to Company of Land 543,034      
Initial Cost to Company of Buildings and Improvements 1,380,715      
Costs Capitalized Subsequent to Acquisition 812,534      
Carrying Amount of Land 546,788      
Carrying Amount of Buildings and Improvements 2,189,495      
Total Carrying Amount 2,736,283 $ 2,208,595 $ 1,819,053 $ 1,287,198
Accumulated Depreciation 298,703 256,015 $ 229,538 $ 169,718
Unamortized loans costs (11,722) (11,879)    
Unamortized premium 1,364 $ 2,943    
Real Estate, Federal Income Tax Basis $ 2,030,600      
Minimum [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Life Used for Depreciation 30 years      
Maximum [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Life Used for Depreciation 40 years      
Core Portfolio [Member] | Crescent Plaza [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company of Land 1,147      
Initial Cost to Company of Buildings and Improvements 7,425      
Costs Capitalized Subsequent to Acquisition 1,502      
Carrying Amount of Land 1,147      
Carrying Amount of Buildings and Improvements 8,927      
Total Carrying Amount 10,074      
Accumulated Depreciation 7,127      
Core Portfolio [Member] | New Louden Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 505      
Initial Cost to Company of Buildings and Improvements 4,161      
Costs Capitalized Subsequent to Acquisition 13,068      
Carrying Amount of Land 505      
Carrying Amount of Buildings and Improvements 17,229      
Total Carrying Amount 17,734      
Accumulated Depreciation 13,535      
Core Portfolio [Member] | Mark Plaza [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 0      
Initial Cost to Company of Buildings and Improvements 3,396      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 3,396      
Total Carrying Amount 3,396      
Accumulated Depreciation 2,838      
Core Portfolio [Member] | Plaza 422 [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 190      
Initial Cost to Company of Buildings and Improvements 3,004      
Costs Capitalized Subsequent to Acquisition 2,765      
Carrying Amount of Land 190      
Carrying Amount of Buildings and Improvements 5,769      
Total Carrying Amount 5,959      
Accumulated Depreciation 5,108      
Core Portfolio [Member] | Route 6 Mall [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 1,664      
Initial Cost to Company of Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition 12,276      
Carrying Amount of Land 1,664      
Carrying Amount of Buildings and Improvements 12,276      
Total Carrying Amount 13,940      
Accumulated Depreciation 8,089      
Core Portfolio [Member] | Abington Towne Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 799      
Initial Cost to Company of Buildings and Improvements 3,197      
Costs Capitalized Subsequent to Acquisition 2,390      
Carrying Amount of Land 799      
Carrying Amount of Buildings and Improvements 5,587      
Total Carrying Amount 6,386      
Accumulated Depreciation 3,539      
Core Portfolio [Member] | Bloomfield Town Square [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 3,207      
Initial Cost to Company of Buildings and Improvements 13,774      
Costs Capitalized Subsequent to Acquisition 21,869      
Carrying Amount of Land 3,207      
Carrying Amount of Buildings and Improvements 35,643      
Total Carrying Amount 38,850      
Accumulated Depreciation 17,407      
Core Portfolio [Member] | Elmwood Park Plaza [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 3,248      
Initial Cost to Company of Buildings and Improvements 12,992      
Costs Capitalized Subsequent to Acquisition 15,855      
Carrying Amount of Land 3,798      
Carrying Amount of Buildings and Improvements 28,297      
Total Carrying Amount 32,095      
Accumulated Depreciation 16,879      
Core Portfolio [Member] | Merrillville Plaza [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 25,150      
Initial Cost to Company of Land 4,288      
Initial Cost to Company of Buildings and Improvements 17,152      
Costs Capitalized Subsequent to Acquisition 5,643      
Carrying Amount of Land 4,288      
Carrying Amount of Buildings and Improvements 22,795      
Total Carrying Amount 27,083      
Accumulated Depreciation 10,339      
Core Portfolio [Member] | Marketplace of Absecon [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 2,573      
Initial Cost to Company of Buildings and Improvements 10,294      
Costs Capitalized Subsequent to Acquisition 4,900      
Carrying Amount of Land 2,577      
Carrying Amount of Buildings and Improvements 15,190      
Total Carrying Amount 17,767      
Accumulated Depreciation 7,116      
Core Portfolio [Member] | 239 Greenwich Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 26,000      
Initial Cost to Company of Land 1,817      
Initial Cost to Company of Buildings and Improvements 15,846      
Costs Capitalized Subsequent to Acquisition 772      
Carrying Amount of Land 1,817      
Carrying Amount of Buildings and Improvements 16,618      
Total Carrying Amount 18,435      
Accumulated Depreciation 6,965      
Core Portfolio [Member] | Hobson West Plaza [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 1,793      
Initial Cost to Company of Buildings and Improvements 7,172      
Costs Capitalized Subsequent to Acquisition 1,903      
Carrying Amount of Land 1,793      
Carrying Amount of Buildings and Improvements 9,075      
Total Carrying Amount 10,868      
Accumulated Depreciation 4,574      
Core Portfolio [Member] | Village Commons Shopping Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 3,229      
Initial Cost to Company of Buildings and Improvements 12,917      
Costs Capitalized Subsequent to Acquisition 4,051      
Carrying Amount of Land 3,229      
Carrying Amount of Buildings and Improvements 16,968      
Total Carrying Amount 20,197      
Accumulated Depreciation 8,323      
Core Portfolio [Member] | Town Line Plaza [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 878      
Initial Cost to Company of Buildings and Improvements 3,510      
Costs Capitalized Subsequent to Acquisition 7,736      
Carrying Amount of Land 907      
Carrying Amount of Buildings and Improvements 11,217      
Total Carrying Amount 12,124      
Accumulated Depreciation 8,761      
Core Portfolio [Member] | Branch Shopping Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 3,156      
Initial Cost to Company of Buildings and Improvements 12,545      
Costs Capitalized Subsequent to Acquisition 15,108      
Carrying Amount of Land 3,401      
Carrying Amount of Buildings and Improvements 27,408      
Total Carrying Amount 30,809      
Accumulated Depreciation 8,225      
Core Portfolio [Member] | The Methuen Shopping Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 956      
Initial Cost to Company of Buildings and Improvements 3,826      
Costs Capitalized Subsequent to Acquisition 739      
Carrying Amount of Land 961      
Carrying Amount of Buildings and Improvements 4,560      
Total Carrying Amount 5,521      
Accumulated Depreciation 2,256      
Core Portfolio [Member] | The Gateway Shopping Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 1,273      
Initial Cost to Company of Buildings and Improvements 5,091      
Costs Capitalized Subsequent to Acquisition 12,258      
Carrying Amount of Land 1,273      
Carrying Amount of Buildings and Improvements 17,349      
Total Carrying Amount 18,622      
Accumulated Depreciation 8,272      
Core Portfolio [Member] | Mad River Station [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 2,350      
Initial Cost to Company of Buildings and Improvements 9,404      
Costs Capitalized Subsequent to Acquisition 1,167      
Carrying Amount of Land 2,350      
Carrying Amount of Buildings and Improvements 10,571      
Total Carrying Amount 12,921      
Accumulated Depreciation 4,900      
Core Portfolio [Member] | Pacesetter Park Shopping Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 1,475      
Initial Cost to Company of Buildings and Improvements 5,899      
Costs Capitalized Subsequent to Acquisition 2,828      
Carrying Amount of Land 1,475      
Carrying Amount of Buildings and Improvements 8,727      
Total Carrying Amount 10,202      
Accumulated Depreciation 4,142      
Core Portfolio [Member] | Brandywine Town Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 141,825      
Initial Cost to Company of Land 21,993      
Initial Cost to Company of Buildings and Improvements 87,988      
Costs Capitalized Subsequent to Acquisition 13,346      
Carrying Amount of Land 24,213      
Carrying Amount of Buildings and Improvements 99,114      
Total Carrying Amount 123,327      
Accumulated Depreciation 31,686      
Core Portfolio [Member] | Brandywine Market Square [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 24,375      
Initial Cost to Company of Land 4,308      
Initial Cost to Company of Buildings and Improvements 17,239      
Costs Capitalized Subsequent to Acquisition 1,630      
Carrying Amount of Land 4,262      
Carrying Amount of Buildings and Improvements 18,915      
Total Carrying Amount 23,177      
Accumulated Depreciation 6,468      
Core Portfolio [Member] | Bartow Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 1,691      
Initial Cost to Company of Buildings and Improvements 5,803      
Costs Capitalized Subsequent to Acquisition 653      
Carrying Amount of Land 1,691      
Carrying Amount of Buildings and Improvements 6,456      
Total Carrying Amount 8,147      
Accumulated Depreciation 2,520      
Core Portfolio [Member] | Amboy Rd. Shopping Ctr. [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 0      
Initial Cost to Company of Buildings and Improvements 11,909      
Costs Capitalized Subsequent to Acquisition 2,482      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 14,391      
Total Carrying Amount 14,391      
Accumulated Depreciation 5,060      
Core Portfolio [Member] | 613-623 West Diversey [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 10,061      
Initial Cost to Company of Buildings and Improvements 2,773      
Costs Capitalized Subsequent to Acquisition 592      
Carrying Amount of Land 10,061      
Carrying Amount of Buildings and Improvements 3,365      
Total Carrying Amount 13,426      
Accumulated Depreciation 893      
Core Portfolio [Member] | Chestnut Hill [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 8,289      
Initial Cost to Company of Buildings and Improvements 5,691      
Costs Capitalized Subsequent to Acquisition 4,514      
Carrying Amount of Land 8,289      
Carrying Amount of Buildings and Improvements 10,205      
Total Carrying Amount 18,494      
Accumulated Depreciation 2,660      
Core Portfolio [Member] | Third Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 11,108      
Initial Cost to Company of Buildings and Improvements 8,038      
Costs Capitalized Subsequent to Acquisition 4,581      
Carrying Amount of Land 11,855      
Carrying Amount of Buildings and Improvements 11,872      
Total Carrying Amount 23,727      
Accumulated Depreciation 2,154      
Core Portfolio [Member] | West Shore Expressway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 3,380      
Initial Cost to Company of Buildings and Improvements 13,499      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 3,380      
Carrying Amount of Buildings and Improvements 13,499      
Total Carrying Amount 16,879      
Accumulated Depreciation 3,351      
Core Portfolio [Member] | West 54th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 16,699      
Initial Cost to Company of Buildings and Improvements 18,704      
Costs Capitalized Subsequent to Acquisition 984      
Carrying Amount of Land 16,699      
Carrying Amount of Buildings and Improvements 19,688      
Total Carrying Amount 36,387      
Accumulated Depreciation 4,253      
Core Portfolio [Member] | Acadia 5-7 East 17th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 3,048      
Initial Cost to Company of Buildings and Improvements 7,281      
Costs Capitalized Subsequent to Acquisition 3,779      
Carrying Amount of Land 3,048      
Carrying Amount of Buildings and Improvements 11,060      
Total Carrying Amount 14,108      
Accumulated Depreciation 1,653      
Core Portfolio [Member] | West Diversey 651-671 W Diversey [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 8,576      
Initial Cost to Company of Buildings and Improvements 17,256      
Costs Capitalized Subsequent to Acquisition 8      
Carrying Amount of Land 8,576      
Carrying Amount of Buildings and Improvements 17,264      
Total Carrying Amount 25,840      
Accumulated Depreciation 1,978      
Core Portfolio [Member] | Mercer Street 15 Mercer Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 1,887      
Initial Cost to Company of Buildings and Improvements 2,483      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 1,887      
Carrying Amount of Buildings and Improvements 2,483      
Total Carrying Amount 4,370      
Accumulated Depreciation 279      
Core Portfolio [Member] | 4401 White Plains [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 6,015      
Initial Cost to Company of Land 1,581      
Initial Cost to Company of Buildings and Improvements 5,054      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 1,581      
Carrying Amount of Buildings and Improvements 5,054      
Total Carrying Amount 6,635      
Accumulated Depreciation 548      
Core Portfolio [Member] | Chicago Street Retail Portfolio [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 14,955      
Initial Cost to Company of Land 18,521      
Initial Cost to Company of Buildings and Improvements 55,627      
Costs Capitalized Subsequent to Acquisition 1,670      
Carrying Amount of Land 18,521      
Carrying Amount of Buildings and Improvements 57,297      
Total Carrying Amount 75,818      
Accumulated Depreciation 5,189      
Core Portfolio [Member] | 330 River Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 3,857      
Initial Cost to Company of Land 3,510      
Initial Cost to Company of Buildings and Improvements 2,886      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 3,510      
Carrying Amount of Buildings and Improvements 2,886      
Total Carrying Amount 6,396      
Accumulated Depreciation 316      
Core Portfolio [Member] | Rhode Island Place Shopping Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 15,727      
Initial Cost to Company of Land 7,458      
Initial Cost to Company of Buildings and Improvements 15,968      
Costs Capitalized Subsequent to Acquisition 709      
Carrying Amount of Land 7,458      
Carrying Amount of Buildings and Improvements 16,677      
Total Carrying Amount 24,135      
Accumulated Depreciation 1,614      
Core Portfolio [Member] | 1520 North Milwaukee Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 2,110      
Initial Cost to Company of Buildings and Improvements 1,306      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 2,110      
Carrying Amount of Buildings and Improvements 1,306      
Total Carrying Amount 3,416      
Accumulated Depreciation 128      
Core Portfolio [Member] | 340 River Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 6,564      
Initial Cost to Company of Land 4,894      
Initial Cost to Company of Buildings and Improvements 11,349      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 4,894      
Carrying Amount of Buildings and Improvements 11,349      
Total Carrying Amount 16,243      
Accumulated Depreciation 1,128      
Core Portfolio [Member] | 930 Rush Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 4,933      
Initial Cost to Company of Buildings and Improvements 14,587      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 4,933      
Carrying Amount of Buildings and Improvements 14,587      
Total Carrying Amount 19,520      
Accumulated Depreciation 1,367      
Core Portfolio [Member] | 28 Jericho Turnpike [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 15,315      
Initial Cost to Company of Land 6,220      
Initial Cost to Company of Buildings and Improvements 24,416      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 6,220      
Carrying Amount of Buildings and Improvements 24,416      
Total Carrying Amount 30,636      
Accumulated Depreciation 2,294      
Core Portfolio [Member] | 181 Main Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 1,908      
Initial Cost to Company of Buildings and Improvements 12,158      
Costs Capitalized Subsequent to Acquisition 41      
Carrying Amount of Land 1,908      
Carrying Amount of Buildings and Improvements 12,199      
Total Carrying Amount 14,107      
Accumulated Depreciation 959      
Core Portfolio [Member] | 83 Spring Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 1,754      
Initial Cost to Company of Buildings and Improvements 9,200      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 1,754      
Carrying Amount of Buildings and Improvements 9,200      
Total Carrying Amount 10,954      
Accumulated Depreciation 805      
Core Portfolio [Member] | 60 Orange Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 8,006      
Initial Cost to Company of Land 3,609      
Initial Cost to Company of Buildings and Improvements 10,790      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 3,609      
Carrying Amount of Buildings and Improvements 10,790      
Total Carrying Amount 14,399      
Accumulated Depreciation 967      
Core Portfolio [Member] | 171-53 and 181-03 Connecticut Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 11,690      
Initial Cost to Company of Buildings and Improvements 10,135      
Costs Capitalized Subsequent to Acquisition 580      
Carrying Amount of Land 11,690      
Carrying Amount of Buildings and Improvements 10,715      
Total Carrying Amount 22,405      
Accumulated Depreciation 878      
Core Portfolio [Member] | 639 West Diversey [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 4,142      
Initial Cost to Company of Land 4,429      
Initial Cost to Company of Buildings and Improvements 6,102      
Costs Capitalized Subsequent to Acquisition 802      
Carrying Amount of Land 4,429      
Carrying Amount of Buildings and Improvements 6,904      
Total Carrying Amount 11,333      
Accumulated Depreciation 549      
Core Portfolio [Member] | 664 North Michigan Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 43,107      
Initial Cost to Company of Land 15,240      
Initial Cost to Company of Buildings and Improvements 65,331      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 15,240      
Carrying Amount of Buildings and Improvements 65,331      
Total Carrying Amount 80,571      
Accumulated Depreciation 4,717      
Core Portfolio [Member] | 8-12 East Walton [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 5,398      
Initial Cost to Company of Buildings and Improvements 15,601      
Costs Capitalized Subsequent to Acquisition 29      
Carrying Amount of Land 5,398      
Carrying Amount of Buildings and Improvements 15,630      
Total Carrying Amount 21,028      
Accumulated Depreciation 1,021      
Core Portfolio [Member] | 3200 - 3204 M Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 6,899      
Initial Cost to Company of Buildings and Improvements 4,249      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 6,899      
Carrying Amount of Buildings and Improvements 4,249      
Total Carrying Amount 11,148      
Accumulated Depreciation 266      
Core Portfolio [Member] | 868 Broadway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 3,519      
Initial Cost to Company of Buildings and Improvements 9,247      
Costs Capitalized Subsequent to Acquisition 5      
Carrying Amount of Land 3,519      
Carrying Amount of Buildings and Improvements 9,252      
Total Carrying Amount 12,771      
Accumulated Depreciation 479      
Core Portfolio [Member] | 313 - 315 Bowery [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 0      
Initial Cost to Company of Buildings and Improvements 5,516      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 5,516      
Total Carrying Amount 5,516      
Accumulated Depreciation 446      
Core Portfolio [Member] | 120 West Broadway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 0      
Initial Cost to Company of Buildings and Improvements 32,819      
Costs Capitalized Subsequent to Acquisition 65      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 32,884      
Total Carrying Amount 32,884      
Accumulated Depreciation 995      
Core Portfolio [Member] | 11 East Walton [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 16,744      
Initial Cost to Company of Buildings and Improvements 28,346      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 16,744      
Carrying Amount of Buildings and Improvements 28,346      
Total Carrying Amount 45,090      
Accumulated Depreciation 1,472      
Core Portfolio [Member] | 61 Main Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 4,578      
Initial Cost to Company of Buildings and Improvements 2,645      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 4,578      
Carrying Amount of Buildings and Improvements 2,645      
Total Carrying Amount 7,223      
Accumulated Depreciation 178      
Core Portfolio [Member] | 865 W. North Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 1,893      
Initial Cost to Company of Buildings and Improvements 11,594      
Costs Capitalized Subsequent to Acquisition 23      
Carrying Amount of Land 1,893      
Carrying Amount of Buildings and Improvements 11,617      
Total Carrying Amount 13,510      
Accumulated Depreciation 521      
Core Portfolio [Member] | 152 - 154 Spring Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 8,544      
Initial Cost to Company of Buildings and Improvements 27,001      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 8,544      
Carrying Amount of Buildings and Improvements 27,001      
Total Carrying Amount 35,545      
Accumulated Depreciation 1,159      
Core Portfolio [Member] | 2520 Flatbush Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 6,613      
Initial Cost to Company of Buildings and Improvements 10,419      
Costs Capitalized Subsequent to Acquisition 193      
Carrying Amount of Land 6,613      
Carrying Amount of Buildings and Improvements 10,612      
Total Carrying Amount 17,225      
Accumulated Depreciation 482      
Core Portfolio [Member] | 252 - 254 Greenwich Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 10,175      
Initial Cost to Company of Buildings and Improvements 12,641      
Costs Capitalized Subsequent to Acquisition 119      
Carrying Amount of Land 10,175      
Carrying Amount of Buildings and Improvements 12,760      
Total Carrying Amount 22,935      
Accumulated Depreciation 657      
Core Portfolio [Member] | Bedford Green [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 29,151      
Initial Cost to Company of Land 12,425      
Initial Cost to Company of Buildings and Improvements 32,730      
Costs Capitalized Subsequent to Acquisition 1,159      
Carrying Amount of Land 12,425      
Carrying Amount of Buildings and Improvements 33,889      
Total Carrying Amount 46,314      
Accumulated Depreciation 1,356      
Core Portfolio [Member] | 131 - 135 Prince Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 0      
Initial Cost to Company of Buildings and Improvements 57,536      
Costs Capitalized Subsequent to Acquisition 71      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 57,607      
Total Carrying Amount 57,607      
Accumulated Depreciation 3,719      
Core Portfolio [Member] | Shops At Grand Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 20,264      
Initial Cost to Company of Buildings and Improvements 33,131      
Costs Capitalized Subsequent to Acquisition 230      
Carrying Amount of Land 20,264      
Carrying Amount of Buildings and Improvements 33,361      
Total Carrying Amount 53,625      
Accumulated Depreciation 1,051      
Core Portfolio [Member] | 201 Needham Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 4,550      
Initial Cost to Company of Buildings and Improvements 4,459      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 4,550      
Carrying Amount of Buildings and Improvements 4,459      
Total Carrying Amount 9,009      
Accumulated Depreciation 80      
Core Portfolio [Member] | City Center San Francisco, CA [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 38,750      
Initial Cost to Company of Buildings and Improvements 116,250      
Costs Capitalized Subsequent to Acquisition 321      
Carrying Amount of Land 38,750      
Carrying Amount of Buildings and Improvements 116,571      
Total Carrying Amount 155,321      
Accumulated Depreciation 2,180      
Core Portfolio [Member] | 163 Highland Avenue Needham, MA [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 9,595      
Initial Cost to Company of Land 6,000      
Initial Cost to Company of Buildings and Improvements 18,000      
Costs Capitalized Subsequent to Acquisition 1      
Carrying Amount of Land 6,000      
Carrying Amount of Buildings and Improvements 18,001      
Total Carrying Amount 24,001      
Accumulated Depreciation 338      
Core Portfolio [Member] | Roosevelt Galleria [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 4,900      
Initial Cost to Company of Buildings and Improvements 14,700      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 4,900      
Carrying Amount of Buildings and Improvements 14,700      
Total Carrying Amount 19,600      
Accumulated Depreciation 123      
Core Portfolio [Member] | Route 202 Shopping Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 0      
Initial Cost to Company of Buildings and Improvements 7,255      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 7,255      
Total Carrying Amount 7,255      
Accumulated Depreciation 136      
Core Portfolio [Member] | Undeveloped Land [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 100      
Initial Cost to Company of Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 100      
Carrying Amount of Buildings and Improvements 0      
Total Carrying Amount 100      
Accumulated Depreciation 0      
Fund II [Member] | 216th Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 25,500      
Initial Cost to Company of Land 7,261      
Initial Cost to Company of Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition 18,481      
Carrying Amount of Land 7,261      
Carrying Amount of Buildings and Improvements 18,481      
Total Carrying Amount 25,742      
Accumulated Depreciation 4,304      
Fund II [Member] | City Point [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 25,324      
Initial Cost to Company of Land 0      
Initial Cost to Company of Buildings and Improvements 0      
Costs Capitalized Subsequent to Acquisition 13,463      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 13,463      
Total Carrying Amount 13,463      
Accumulated Depreciation 405      
Fund II [Member] | 161st Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 29,500      
Initial Cost to Company of Land 16,679      
Initial Cost to Company of Buildings and Improvements 28,410      
Costs Capitalized Subsequent to Acquisition 25,590      
Carrying Amount of Land 16,679      
Carrying Amount of Buildings and Improvements 54,000      
Total Carrying Amount 70,679      
Accumulated Depreciation 10,363      
Fund III [Member] | Cortlandt Towne Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 83,070      
Initial Cost to Company of Land 7,293      
Initial Cost to Company of Buildings and Improvements 61,395      
Costs Capitalized Subsequent to Acquisition 10,087      
Carrying Amount of Land 7,293      
Carrying Amount of Buildings and Improvements 71,482      
Total Carrying Amount 78,775      
Accumulated Depreciation 20,855      
Fund III [Member] | Heritage Shops [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 24,500      
Initial Cost to Company of Land 13,131      
Initial Cost to Company of Buildings and Improvements 15,409      
Costs Capitalized Subsequent to Acquisition 325      
Carrying Amount of Land 13,131      
Carrying Amount of Buildings and Improvements 15,734      
Total Carrying Amount 28,865      
Accumulated Depreciation 2,575      
Fund III [Member] | 654 Broadway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 8,835      
Initial Cost to Company of Land 9,040      
Initial Cost to Company of Buildings and Improvements 3,654      
Costs Capitalized Subsequent to Acquisition 2,801      
Carrying Amount of Land 9,040      
Carrying Amount of Buildings and Improvements 6,455      
Total Carrying Amount 15,495      
Accumulated Depreciation 504      
Fund III [Member] | New Hyde Park Shopping Center [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 11,240      
Initial Cost to Company of Land 3,016      
Initial Cost to Company of Buildings and Improvements 7,733      
Costs Capitalized Subsequent to Acquisition 4,088      
Carrying Amount of Land 3,016      
Carrying Amount of Buildings and Improvements 11,821      
Total Carrying Amount 14,837      
Accumulated Depreciation 1,635      
Fund III [Member] | 640 Broadway [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 22,109      
Initial Cost to Company of Land 12,503      
Initial Cost to Company of Buildings and Improvements 19,960      
Costs Capitalized Subsequent to Acquisition 9,786      
Carrying Amount of Land 12,503      
Carrying Amount of Buildings and Improvements 29,746      
Total Carrying Amount 42,249      
Accumulated Depreciation 2,734      
Fund III [Member] | 3780 to 3858 Nortrand Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 11,527      
Initial Cost to Company of Land 6,229      
Initial Cost to Company of Buildings and Improvements 11,216      
Costs Capitalized Subsequent to Acquisition 4,581      
Carrying Amount of Land 6,229      
Carrying Amount of Buildings and Improvements 15,797      
Total Carrying Amount 22,026      
Accumulated Depreciation 1,009      
Fund IV [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Unamortized loans costs (10,567)      
Unamortized premium 1,364      
Fund IV [Member] | Paramus Plaza [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 13,339      
Initial Cost to Company of Land 11,052      
Initial Cost to Company of Buildings and Improvements 7,037      
Costs Capitalized Subsequent to Acquisition 2,988      
Carrying Amount of Land 11,052      
Carrying Amount of Buildings and Improvements 10,025      
Total Carrying Amount 21,077      
Accumulated Depreciation 477      
Fund IV [Member] | 1151 Third Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 12,481      
Initial Cost to Company of Land 8,306      
Initial Cost to Company of Buildings and Improvements 9,685      
Costs Capitalized Subsequent to Acquisition 1,380      
Carrying Amount of Land 8,306      
Carrying Amount of Buildings and Improvements 11,065      
Total Carrying Amount 19,371      
Accumulated Depreciation 644      
Fund IV [Member] | Lake Montclair [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 14,904      
Initial Cost to Company of Land 7,077      
Initial Cost to Company of Buildings and Improvements 12,028      
Costs Capitalized Subsequent to Acquisition 422      
Carrying Amount of Land 7,077      
Carrying Amount of Buildings and Improvements 12,450      
Total Carrying Amount 19,527      
Accumulated Depreciation 735      
Fund IV [Member] | 938 West North Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 12,500      
Initial Cost to Company of Land 2,314      
Initial Cost to Company of Buildings and Improvements 17,067      
Costs Capitalized Subsequent to Acquisition 35      
Carrying Amount of Land 2,314      
Carrying Amount of Buildings and Improvements 17,102      
Total Carrying Amount 19,416      
Accumulated Depreciation 878      
Fund IV [Member] | 17 E. 71st Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 19,000      
Initial Cost to Company of Land 7,391      
Initial Cost to Company of Buildings and Improvements 20,176      
Costs Capitalized Subsequent to Acquisition 245      
Carrying Amount of Land 7,391      
Carrying Amount of Buildings and Improvements 20,421      
Total Carrying Amount 27,812      
Accumulated Depreciation 619      
Fund IV [Member] | 1035 Third Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 42,000      
Initial Cost to Company of Land 12,759      
Initial Cost to Company of Buildings and Improvements 38,306      
Costs Capitalized Subsequent to Acquisition 797      
Carrying Amount of Land 12,759      
Carrying Amount of Buildings and Improvements 39,103      
Total Carrying Amount 51,862      
Accumulated Depreciation 879      
Fund IV [Member] | 801 Madison Avenue [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 8,250      
Initial Cost to Company of Buildings and Improvements 24,750      
Costs Capitalized Subsequent to Acquisition 57      
Carrying Amount of Land 8,250      
Carrying Amount of Buildings and Improvements 24,807      
Total Carrying Amount 33,057      
Accumulated Depreciation 464      
Fund IV [Member] | 2208-2216 Filmore Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 2,156      
Initial Cost to Company of Buildings and Improvements 6,469      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 2,156      
Carrying Amount of Buildings and Improvements 6,469      
Total Carrying Amount 8,625      
Accumulated Depreciation 27      
Fund IV [Member] | 146 Geary Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 9,500      
Initial Cost to Company of Buildings and Improvements 28,500      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 9,500      
Carrying Amount of Buildings and Improvements 28,500      
Total Carrying Amount 38,000      
Accumulated Depreciation 119      
Fund IV [Member] | 2207 Fillmore Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 1,120      
Initial Cost to Company of Land 700      
Initial Cost to Company of Buildings and Improvements 2,100      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 700      
Carrying Amount of Buildings and Improvements 2,100      
Total Carrying Amount 2,800      
Accumulated Depreciation 4      
Fund IV [Member] | 1861 Union Street [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company of Land 875      
Initial Cost to Company of Buildings and Improvements 2,625      
Costs Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 875      
Carrying Amount of Buildings and Improvements 2,625      
Total Carrying Amount 3,500      
Accumulated Depreciation 5      
Fund IV [Member] | Real Estate Under Development [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 328,521      
Initial Cost to Company of Land 32,705      
Initial Cost to Company of Buildings and Improvements 24,878      
Costs Capitalized Subsequent to Acquisition 551,991      
Carrying Amount of Land 32,705      
Carrying Amount of Buildings and Improvements 576,869      
Total Carrying Amount 609,574      
Accumulated Depreciation $ 0