SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Schedule of Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 1,055,728
Initial Cost to Company of Land	796,928
Initial Cost to Company of Buildings and Improvements	1,774,296
Costs Capitalized Subsequent to Acquisition	810,776
Carrying Amount of Land	751,655
Carrying Amount of Buildings and Improvements	2,630,345
Total Carrying Amount	3,382,000	$ 2,736,283	$ 2,208,595	$ 1,819,053
Accumulated Depreciation	287,066	298,703	$ 256,015	$ 229,538
Debt of assets held for sale	25,500
Unamortized premium	1,336	$ 1,364
Real Estate, Federal Income Tax Basis	$ 2,550,500
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	3,027
Carrying Amount of Land	1,147
Carrying Amount of Buildings and Improvements	10,452
Total Carrying Amount	11,599
Accumulated Depreciation	7,395
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	13,353
Carrying Amount of Land	505
Carrying Amount of Buildings and Improvements	17,514
Total Carrying Amount	18,019
Accumulated Depreciation	13,968
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	2,887
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	5,155
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	12,437
Carrying Amount of Land	1,664
Carrying Amount of Buildings and Improvements	12,437
Total Carrying Amount	14,101
Accumulated Depreciation	8,559
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	2,400
Carrying Amount of Land	799
Carrying Amount of Buildings and Improvements	5,597
Total Carrying Amount	6,396
Accumulated Depreciation	3,754
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	22,463
Carrying Amount of Land	3,207
Carrying Amount of Buildings and Improvements	36,237
Total Carrying Amount	39,444
Accumulated Depreciation	19,922
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	15,860
Carrying Amount of Land	3,798
Carrying Amount of Buildings and Improvements	28,302
Total Carrying Amount	32,100
Accumulated Depreciation	18,112
Core Portfolio [Member] | Merrillville Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	24,779
Initial Cost to Company of Land	4,288
Initial Cost to Company of Buildings and Improvements	17,152
Costs Capitalized Subsequent to Acquisition	5,647
Carrying Amount of Land	4,288
Carrying Amount of Buildings and Improvements	22,799
Total Carrying Amount	27,087
Accumulated Depreciation	11,276
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	7,612
Core Portfolio [Member] | 239 Greenwich Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	27,000
Initial Cost to Company of Land	1,817
Initial Cost to Company of Buildings and Improvements	15,846
Costs Capitalized Subsequent to Acquisition	776
Carrying Amount of Land	1,817
Carrying Amount of Buildings and Improvements	16,622
Total Carrying Amount	18,439
Accumulated Depreciation	7,389
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	1,970
Carrying Amount of Land	1,793
Carrying Amount of Buildings and Improvements	9,142
Total Carrying Amount	10,935
Accumulated Depreciation	4,855
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	4,225
Carrying Amount of Land	3,229
Carrying Amount of Buildings and Improvements	17,142
Total Carrying Amount	20,371
Accumulated Depreciation	8,852
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	8,914
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	15,883
Carrying Amount of Land	3,401
Carrying Amount of Buildings and Improvements	28,183
Total Carrying Amount	31,584
Accumulated Depreciation	9,719
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	993
Carrying Amount of Land	961
Carrying Amount of Buildings and Improvements	4,814
Total Carrying Amount	5,775
Accumulated Depreciation	2,369
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	8,902
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	1,579
Carrying Amount of Land	2,350
Carrying Amount of Buildings and Improvements	10,983
Total Carrying Amount	13,333
Accumulated Depreciation	5,256
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	3,350
Carrying Amount of Land	1,475
Carrying Amount of Buildings and Improvements	9,249
Total Carrying Amount	10,724
Accumulated Depreciation	4,603
Core Portfolio [Member] | Brandywine Town Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	26,250
Initial Cost to Company of Land	5,063
Initial Cost to Company of Buildings and Improvements	15,252
Costs Capitalized Subsequent to Acquisition	2,495
Carrying Amount of Land	5,201
Carrying Amount of Buildings and Improvements	17,609
Total Carrying Amount	22,810
Accumulated Depreciation	6,392
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	1,111
Carrying Amount of Land	1,691
Carrying Amount of Buildings and Improvements	6,914
Total Carrying Amount	8,605
Accumulated Depreciation	2,732
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	5,812
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	972
Carrying Amount of Land	10,061
Carrying Amount of Buildings and Improvements	3,745
Total Carrying Amount	13,806
Accumulated Depreciation	984
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	4,509
Carrying Amount of Land	8,289
Carrying Amount of Buildings and Improvements	10,200
Total Carrying Amount	18,489
Accumulated Depreciation	3,175
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	4,701
Carrying Amount of Land	11,855
Carrying Amount of Buildings and Improvements	11,992
Total Carrying Amount	23,847
Accumulated Depreciation	2,456
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	3,732
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	992
Carrying Amount of Land	16,699
Carrying Amount of Buildings and Improvements	19,696
Total Carrying Amount	36,395
Accumulated Depreciation	4,837
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	5,147
Carrying Amount of Land	3,048
Carrying Amount of Buildings and Improvements	12,428
Total Carrying Amount	15,476
Accumulated Depreciation	2,027
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	2,409
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	341
Core Portfolio [Member] | 4401 White Plains [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	5,884
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	674
Core Portfolio [Member] | Chicago Street Retail Portfolio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	18,521
Initial Cost to Company of Buildings and Improvements	55,627
Costs Capitalized Subsequent to Acquisition	1,923
Carrying Amount of Land	18,560
Carrying Amount of Buildings and Improvements	57,511
Total Carrying Amount	76,071
Accumulated Depreciation	6,761
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	161
Core Portfolio [Member] | 330 River Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	11,884
Initial Cost to Company of Land	8,404
Initial Cost to Company of Buildings and Improvements	14,235
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	8,404
Carrying Amount of Buildings and Improvements	14,235
Total Carrying Amount	22,639
Accumulated Depreciation	1,812
Core Portfolio [Member] | Rhode Island Place Shopping Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	7,458
Initial Cost to Company of Buildings and Improvements	15,968
Costs Capitalized Subsequent to Acquisition	917
Carrying Amount of Land	7,458
Carrying Amount of Buildings and Improvements	16,885
Total Carrying Amount	24,343
Accumulated Depreciation	2,142
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	9
Carrying Amount of Land	4,933
Carrying Amount of Buildings and Improvements	14,596
Total Carrying Amount	19,529
Accumulated Depreciation	1,732
Core Portfolio [Member] | 28 Jericho Turnpike [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	14,869
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	2,935
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	1,278
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	1,035
Core Portfolio [Member] | 60 Orange Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	7,769
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	1,264
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	726
Carrying Amount of Land	11,689
Carrying Amount of Buildings and Improvements	10,862
Total Carrying Amount	22,551
Accumulated Depreciation	1,199
Core Portfolio [Member] | 639 West Diversey [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	4,429
Initial Cost to Company of Buildings and Improvements	6,102
Costs Capitalized Subsequent to Acquisition	804
Carrying Amount of Land	4,429
Carrying Amount of Buildings and Improvements	6,906
Total Carrying Amount	11,335
Accumulated Depreciation	775
Core Portfolio [Member] | 664 North Michigan Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	41,846
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	6,345
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	1,414
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	168
Carrying Amount of Land	6,899
Carrying Amount of Buildings and Improvements	4,417
Total Carrying Amount	11,316
Accumulated Depreciation	401
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	711
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	670
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	919
Carrying Amount of Land	0
Carrying Amount of Buildings and Improvements	33,738
Total Carrying Amount	33,738
Accumulated Depreciation	1,593
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	192
Carrying Amount of Land	16,744
Carrying Amount of Buildings and Improvements	28,538
Total Carrying Amount	45,282
Accumulated Depreciation	2,198
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	20
Carrying Amount of Land	4,578
Carrying Amount of Buildings and Improvements	2,665
Total Carrying Amount	7,243
Accumulated Depreciation	243
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	813
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	1,834
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	754
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	978
Core Portfolio [Member] | Bedford Green [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	28,697
Initial Cost to Company of Land	12,425
Initial Cost to Company of Buildings and Improvements	32,730
Costs Capitalized Subsequent to Acquisition	1,801
Carrying Amount of Land	12,425
Carrying Amount of Buildings and Improvements	34,531
Total Carrying Amount	46,956
Accumulated Depreciation	2,264
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	103
Carrying Amount of Land	0
Carrying Amount of Buildings and Improvements	57,639
Total Carrying Amount	57,639
Accumulated Depreciation	6,344
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	279
Carrying Amount of Land	20,264
Carrying Amount of Buildings and Improvements	33,410
Total Carrying Amount	53,674
Accumulated Depreciation	1,898
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	105
Carrying Amount of Land	4,550
Carrying Amount of Buildings and Improvements	4,564
Total Carrying Amount	9,114
Accumulated Depreciation	303
Core Portfolio [Member] | City Center San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	36,063
Initial Cost to Company of Buildings and Improvements	109,098
Costs Capitalized Subsequent to Acquisition	658
Carrying Amount of Land	36,063
Carrying Amount of Buildings and Improvements	109,756
Total Carrying Amount	145,819
Accumulated Depreciation	4,909
Core Portfolio [Member] | 163 Highland Avenue Needham, MA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	9,359
Initial Cost to Company of Land	12,679
Initial Cost to Company of Buildings and Improvements	11,213
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	12,679
Carrying Amount of Buildings and Improvements	11,213
Total Carrying Amount	23,892
Accumulated Depreciation	624
Core Portfolio [Member] | Roosevelt Galleria [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	4,838
Initial Cost to Company of Buildings and Improvements	14,574
Costs Capitalized Subsequent to Acquisition	26
Carrying Amount of Land	4,838
Carrying Amount of Buildings and Improvements	14,600
Total Carrying Amount	19,438
Accumulated Depreciation	489
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	6,346
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	0
Carrying Amount of Buildings and Improvements	6,346
Total Carrying Amount	6,346
Accumulated Depreciation	302
Core Portfolio [Member] | 991 Madison Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Buildings and Improvements	76,965
Carrying Amount of Land	0
Carrying Amount of Buildings and Improvements	76,965
Total Carrying Amount	76,965
Accumulated Depreciation	0
Core Portfolio [Member] | 165 Newbury Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
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	66
Core Portfolio [Member] | Concord and Milwaukee [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	2,874
Initial Cost to Company of Land	2,739
Initial Cost to Company of Buildings and Improvements	2,746
Carrying Amount of Land	2,739
Carrying Amount of Buildings and Improvements	2,746
Total Carrying Amount	5,485
Accumulated Depreciation	30
Core Portfolio [Member] | State and Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	25,485
Initial Cost to Company of Land	3,907
Initial Cost to Company of Buildings and Improvements	70,943
Carrying Amount of Land	3,907
Carrying Amount of Buildings and Improvements	70,943
Total Carrying Amount	74,850
Accumulated Depreciation	591
Core Portfolio [Member] | 151 North State Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	14,464
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	266
Core Portfolio [Member] | North & Kingsbury [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	13,292
Initial Cost to Company of Land	18,731
Initial Cost to Company of Buildings and Improvements	16,292
Carrying Amount of Land	18,731
Carrying Amount of Buildings and Improvements	16,292
Total Carrying Amount	35,023
Accumulated Depreciation	141
Core Portfolio [Member] | Sullivan Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	13,433
Initial Cost to Company of Buildings and Improvements	137,327
Costs Capitalized Subsequent to Acquisition	10
Carrying Amount of Land	13,443
Carrying Amount of Buildings and Improvements	137,327
Total Carrying Amount	150,770
Accumulated Depreciation	1,145
Core Portfolio [Member] | California and Armitage [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	2,675
Initial Cost to Company of Land	6,770
Initial Cost to Company of Buildings and Improvements	2,292
Carrying Amount of Land	6,770
Carrying Amount of Buildings and Improvements	2,292
Total Carrying Amount	9,062
Accumulated Depreciation	21
Core Portfolio [Member] | 555 9th Avenue [Member]
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
Carrying Amount of Land	75,591
Carrying Amount of Buildings and Improvements	73,268
Total Carrying Amount	148,859
Accumulated Depreciation	308
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] | 161st Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	46,500
Initial Cost to Company of Land	16,679
Initial Cost to Company of Buildings and Improvements	28,410
Costs Capitalized Subsequent to Acquisition	28,272
Carrying Amount of Land	16,679
Carrying Amount of Buildings and Improvements	56,682
Total Carrying Amount	73,361
Accumulated Depreciation	13,067
Fund II [Member] | City Point [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	326,042
Initial Cost to Company of Land	0
Initial Cost to Company of Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition	207,561
Carrying Amount of Land	0
Carrying Amount of Buildings and Improvements	207,561
Total Carrying Amount	207,561
Accumulated Depreciation	1,848
Fund III [Member] | 654 Broadway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	8,615
Initial Cost to Company of Land	9,040
Initial Cost to Company of Buildings and Improvements	3,654
Costs Capitalized Subsequent to Acquisition	2,869
Carrying Amount of Land	9,040
Carrying Amount of Buildings and Improvements	6,523
Total Carrying Amount	15,563
Accumulated Depreciation	656
Fund III [Member] | New Hyde Park Shopping Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	10,760
Initial Cost to Company of Land	3,016
Initial Cost to Company of Buildings and Improvements	7,733
Costs Capitalized Subsequent to Acquisition	4,151
Carrying Amount of Land	3,016
Carrying Amount of Buildings and Improvements	11,884
Total Carrying Amount	14,900
Accumulated Depreciation	2,225
Fund III [Member] | 640 Broadway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	48,470
Initial Cost to Company of Land	12,503
Initial Cost to Company of Buildings and Improvements	19,960
Costs Capitalized Subsequent to Acquisition	10,953
Carrying Amount of Land	12,503
Carrying Amount of Buildings and Improvements	30,913
Total Carrying Amount	43,416
Accumulated Depreciation	3,799
Fund III [Member] | 3780 to 3858 Nortrand Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	11,137
Initial Cost to Company of Land	6,229
Initial Cost to Company of Buildings and Improvements	11,216
Costs Capitalized Subsequent to Acquisition	5,612
Carrying Amount of Land	6,229
Carrying Amount of Buildings and Improvements	16,828
Total Carrying Amount	23,057
Accumulated Depreciation	1,463
Fund IV [Member]
Real Estate and Accumulated Depreciation [Line Items]
Unamortized loans costs	(16,642)
Unamortized premium	1,336
Fund IV [Member] | Paramus Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	14,099
Initial Cost to Company of Land	11,052
Initial Cost to Company of Buildings and Improvements	7,037
Costs Capitalized Subsequent to Acquisition	8,280
Carrying Amount of Land	11,052
Carrying Amount of Buildings and Improvements	15,317
Total Carrying Amount	26,369
Accumulated Depreciation	962
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	1,412
Carrying Amount of Land	8,306
Carrying Amount of Buildings and Improvements	11,097
Total Carrying Amount	19,403
Accumulated Depreciation	990
Fund IV [Member] | Lake Montclair [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	14,509
Initial Cost to Company of Land	7,077
Initial Cost to Company of Buildings and Improvements	12,028
Costs Capitalized Subsequent to Acquisition	439
Carrying Amount of Land	7,077
Carrying Amount of Buildings and Improvements	12,467
Total Carrying Amount	19,544
Accumulated Depreciation	1,103
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	176
Carrying Amount of Land	2,314
Carrying Amount of Buildings and Improvements	17,243
Total Carrying Amount	19,557
Accumulated Depreciation	1,310
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	263
Carrying Amount of Land	7,391
Carrying Amount of Buildings and Improvements	20,439
Total Carrying Amount	27,830
Accumulated Depreciation	1,149
Fund IV [Member] | 1035 Third Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	41,826
Initial Cost to Company of Land	14,099
Initial Cost to Company of Buildings and Improvements	39,928
Costs Capitalized Subsequent to Acquisition	671
Carrying Amount of Land	14,099
Carrying Amount of Buildings and Improvements	40,599
Total Carrying Amount	54,698
Accumulated Depreciation	1,858
Fund IV [Member] | 801 Madison Avenue [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	4,178
Initial Cost to Company of Buildings and Improvements	28,470
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	4,178
Carrying Amount of Buildings and Improvements	28,470
Total Carrying Amount	32,648
Accumulated Depreciation	890
Fund IV [Member] | 2208-2216 Filmore Street [Member]
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
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	3,027
Carrying Amount of Buildings and Improvements	6,376
Total Carrying Amount	9,403
Accumulated Depreciation	186
Fund IV [Member] | 146 Geary Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	27,700
Initial Cost to Company of Land	9,500
Initial Cost to Company of Buildings and Improvements	28,500
Costs Capitalized Subsequent to Acquisition	7
Carrying Amount of Land	9,500
Carrying Amount of Buildings and Improvements	28,507
Total Carrying Amount	38,007
Accumulated Depreciation	831
Fund IV [Member] | 2207 Fillmore Street [Member]
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
Costs Capitalized Subsequent to Acquisition	108
Carrying Amount of Land	1,498
Carrying Amount of Buildings and Improvements	1,843
Total Carrying Amount	3,341
Accumulated Depreciation	48
Fund IV [Member] | 1861 Union Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	2,315
Initial Cost to Company of Land	2,188
Initial Cost to Company of Buildings and Improvements	1,293
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	2,188
Carrying Amount of Buildings and Improvements	1,293
Total Carrying Amount	3,481
Accumulated Depreciation	35
Fund IV [Member] | Restaurant at Fort Point [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	6,500
Initial Cost to Company of Land	1,041
Initial Cost to Company of Buildings and Improvements	10,905
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	1,041
Carrying Amount of Buildings and Improvements	10,905
Total Carrying Amount	11,946
Accumulated Depreciation	273
Fund IV [Member] | Wake Forest Crossing [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	7,570
Initial Cost to Company of Buildings and Improvements	24,829
Costs Capitalized Subsequent to Acquisition	1
Carrying Amount of Land	7,570
Carrying Amount of Buildings and Improvements	24,830
Total Carrying Amount	32,400
Accumulated Depreciation	197
Fund IV [Member] | Airport Mall [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	2,294
Initial Cost to Company of Buildings and Improvements	7,067
Costs Capitalized Subsequent to Acquisition	11
Carrying Amount of Land	2,294
Carrying Amount of Buildings and Improvements	7,078
Total Carrying Amount	9,372
Accumulated Depreciation	40
Fund IV [Member] | Colonie Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	2,852
Initial Cost to Company of Buildings and Improvements	9,619
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	2,852
Carrying Amount of Buildings and Improvements	9,619
Total Carrying Amount	12,471
Accumulated Depreciation	48
Fund IV [Member] | Dauphin Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	5,290
Initial Cost to Company of Buildings and Improvements	9,464
Costs Capitalized Subsequent to Acquisition	4
Carrying Amount of Land	5,290
Carrying Amount of Buildings and Improvements	9,468
Total Carrying Amount	14,758
Accumulated Depreciation	50
Fund IV [Member] | JFK Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	751
Initial Cost to Company of Buildings and Improvements	5,991
Costs Capitalized Subsequent to Acquisition	2
Carrying Amount of Land	751
Carrying Amount of Buildings and Improvements	5,993
Total Carrying Amount	6,744
Accumulated Depreciation	32
Fund IV [Member] | Mayfair Shopping Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	6,178
Initial Cost to Company of Buildings and Improvements	9,266
Costs Capitalized Subsequent to Acquisition	2
Carrying Amount of Land	6,178
Carrying Amount of Buildings and Improvements	9,268
Total Carrying Amount	15,446
Accumulated Depreciation	42
Fund IV [Member] | Shaw's Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	828
Initial Cost to Company of Buildings and Improvements	11,814
Costs Capitalized Subsequent to Acquisition	1
Carrying Amount of Land	828
Carrying Amount of Buildings and Improvements	11,815
Total Carrying Amount	12,643
Accumulated Depreciation	55
Fund IV [Member] | Wells Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to Company of Land	1,892
Initial Cost to Company of Buildings and Improvements	2,585
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	1,892
Carrying Amount of Buildings and Improvements	2,585
Total Carrying Amount	4,477
Accumulated Depreciation	18
Fund IV [Member] | 717 N Michigan [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	63,900
Initial Cost to Company of Land	72,174
Initial Cost to Company of Buildings and Improvements	34,606
Costs Capitalized Subsequent to Acquisition	0
Carrying Amount of Land	72,174
Carrying Amount of Buildings and Improvements	34,606
Total Carrying Amount	106,780
Accumulated Depreciation	72
Fund IV [Member] | Real Estate Under Development [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	55,327
Initial Cost to Company of Land	105,442
Initial Cost to Company of Buildings and Improvements	61,172
Costs Capitalized Subsequent to Acquisition	376,872
Carrying Amount of Land	58,403
Carrying Amount of Buildings and Improvements	485,083
Total Carrying Amount	543,486
Accumulated Depreciation	$ 0