Schedule III - Summary 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	$ 554,442	$ 635,345
Initial cost to company, Land	1,222,871
Initial cost to company, Buildings and Improvements	1,910,686
Cost Capitalized Subsequent to Acquisition	2,930,849
Gross amount at which carried at close of period, Land	1,209,804
Gross amount at which carried at close of period, Buildings and Improvements	4,854,602
Gross amount at which carried at close of period, Total	6,064,406	5,608,998	$ 5,149,463	$ 4,779,674
Accumulated Depreciation and Amortization	1,574,041	$ 1,467,050	$ 1,350,471	$ 1,224,295
150 Post Street
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	11,685
Initial cost to company, Buildings and Improvements	9,181
Cost Capitalized Subsequent to Acquisition	16,200
Gross amount at which carried at close of period, Land	11,685
Gross amount at which carried at close of period, Buildings and Improvements	25,381
Gross amount at which carried at close of period, Total	37,066
Accumulated Depreciation and Amortization	$ 17,181
Life on which depreciation in latest income statements is computed	35 years
29th Place
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 4,732
Initial cost to company, Land	10,211
Initial cost to company, Buildings and Improvements	18,863
Cost Capitalized Subsequent to Acquisition	11,441
Gross amount at which carried at close of period, Land	10,225
Gross amount at which carried at close of period, Buildings and Improvements	30,290
Gross amount at which carried at close of period, Total	40,515
Accumulated Depreciation and Amortization	$ 8,893
Life on which depreciation in latest income statements is computed	35 years
Andorra
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 2,432
Initial cost to company, Buildings and Improvements	12,346
Cost Capitalized Subsequent to Acquisition	10,967
Gross amount at which carried at close of period, Land	2,432
Gross amount at which carried at close of period, Buildings and Improvements	23,313
Gross amount at which carried at close of period, Total	25,745
Accumulated Depreciation and Amortization	$ 17,389
Life on which depreciation in latest income statements is computed	35 years
Assembly Row/Assembly Square Market Place
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 93,252
Initial cost to company, Buildings and Improvements	34,196
Cost Capitalized Subsequent to Acquisition	346,444
Gross amount at which carried at close of period, Land	93,252
Gross amount at which carried at close of period, Buildings and Improvements	380,640
Gross amount at which carried at close of period, Total	473,892
Accumulated Depreciation and Amortization	$ 28,839
Life on which depreciation in latest income statements is computed	35 years
Bala Cynwyd
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 3,565
Initial cost to company, Buildings and Improvements	14,466
Cost Capitalized Subsequent to Acquisition	23,077
Gross amount at which carried at close of period, Land	3,566
Gross amount at which carried at close of period, Buildings and Improvements	37,542
Gross amount at which carried at close of period, Total	41,108
Accumulated Depreciation and Amortization	$ 17,580
Life on which depreciation in latest income statements is computed	35 years
Barracks Road
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 4,363
Initial cost to company, Buildings and Improvements	16,459
Cost Capitalized Subsequent to Acquisition	40,076
Gross amount at which carried at close of period, Land	4,363
Gross amount at which carried at close of period, Buildings and Improvements	56,535
Gross amount at which carried at close of period, Total	60,898
Accumulated Depreciation and Amortization	$ 39,146
Life on which depreciation in latest income statements is computed	35 years
Bethesda Row
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 46,579
Initial cost to company, Buildings and Improvements	35,406
Cost Capitalized Subsequent to Acquisition	143,006
Gross amount at which carried at close of period, Land	44,880
Gross amount at which carried at close of period, Buildings and Improvements	180,111
Gross amount at which carried at close of period, Total	224,991
Accumulated Depreciation and Amortization	$ 62,238
Bethesda Row | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statements is computed	35 years
Bethesda Row | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statements is computed	50 years
Brick Plaza
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 0
Initial cost to company, Buildings and Improvements	24,715
Cost Capitalized Subsequent to Acquisition	36,645
Gross amount at which carried at close of period, Land	3,945
Gross amount at which carried at close of period, Buildings and Improvements	57,415
Gross amount at which carried at close of period, Total	61,360
Accumulated Depreciation and Amortization	$ 44,188
Life on which depreciation in latest income statements is computed	35 years
Bristol Plaza
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 3,856
Initial cost to company, Buildings and Improvements	15,959
Cost Capitalized Subsequent to Acquisition	9,973
Gross amount at which carried at close of period, Land	3,856
Gross amount at which carried at close of period, Buildings and Improvements	25,932
Gross amount at which carried at close of period, Total	29,788
Accumulated Depreciation and Amortization	$ 15,596
Life on which depreciation in latest income statements is computed	35 years
Brook 35
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 11,500
Initial cost to company, Land	7,128
Initial cost to company, Buildings and Improvements	38,355
Cost Capitalized Subsequent to Acquisition	1,334
Gross amount at which carried at close of period, Land	7,128
Gross amount at which carried at close of period, Buildings and Improvements	39,689
Gross amount at which carried at close of period, Total	46,817
Accumulated Depreciation and Amortization	$ 2,662
Life on which depreciation in latest income statements is computed	35 years
Chelsea Commons
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 6,602
Initial cost to company, Land	9,417
Initial cost to company, Buildings and Improvements	19,466
Cost Capitalized Subsequent to Acquisition	13,853
Gross amount at which carried at close of period, Land	9,396
Gross amount at which carried at close of period, Buildings and Improvements	33,340
Gross amount at which carried at close of period, Total	42,736
Accumulated Depreciation and Amortization	$ 6,482
Life on which depreciation in latest income statements is computed	35 years
CocoWalk
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 28,149
Initial cost to company, Buildings and Improvements	70,091
Cost Capitalized Subsequent to Acquisition	719
Gross amount at which carried at close of period, Land	28,149
Gross amount at which carried at close of period, Buildings and Improvements	70,810
Gross amount at which carried at close of period, Total	98,959
Accumulated Depreciation and Amortization	$ 1,764
Life on which depreciation in latest income statements is computed	35 years
Colorado Blvd
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 5,262
Initial cost to company, Buildings and Improvements	4,071
Cost Capitalized Subsequent to Acquisition	8,669
Gross amount at which carried at close of period, Land	5,262
Gross amount at which carried at close of period, Buildings and Improvements	12,740
Gross amount at which carried at close of period, Total	18,002
Accumulated Depreciation and Amortization	$ 9,804
Life on which depreciation in latest income statements is computed	35 years
Congressional Plaza
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 2,793
Initial cost to company, Buildings and Improvements	7,424
Cost Capitalized Subsequent to Acquisition	80,282
Gross amount at which carried at close of period, Land	1,020
Gross amount at which carried at close of period, Buildings and Improvements	89,479
Gross amount at which carried at close of period, Total	90,499
Accumulated Depreciation and Amortization	$ 48,023
Life on which depreciation in latest income statements is computed	35 years
Courthouse Center
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 1,750
Initial cost to company, Buildings and Improvements	1,869
Cost Capitalized Subsequent to Acquisition	1,114
Gross amount at which carried at close of period, Land	1,750
Gross amount at which carried at close of period, Buildings and Improvements	2,983
Gross amount at which carried at close of period, Total	4,733
Accumulated Depreciation and Amortization	$ 1,658
Life on which depreciation in latest income statements is computed	35 years
Crossroads
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 4,635
Initial cost to company, Buildings and Improvements	11,611
Cost Capitalized Subsequent to Acquisition	15,188
Gross amount at which carried at close of period, Land	4,635
Gross amount at which carried at close of period, Buildings and Improvements	26,799
Gross amount at which carried at close of period, Total	31,434
Accumulated Depreciation and Amortization	$ 14,909
Life on which depreciation in latest income statements is computed	35 years
Crow Canyon Commons
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 27,245
Initial cost to company, Buildings and Improvements	54,575
Cost Capitalized Subsequent to Acquisition	6,414
Gross amount at which carried at close of period, Land	27,245
Gross amount at which carried at close of period, Buildings and Improvements	60,989
Gross amount at which carried at close of period, Total	88,234
Accumulated Depreciation and Amortization	$ 17,659
Life on which depreciation in latest income statements is computed	35 years
Darien
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 29,809
Initial cost to company, Buildings and Improvements	18,302
Cost Capitalized Subsequent to Acquisition	280
Gross amount at which carried at close of period, Land	29,809
Gross amount at which carried at close of period, Buildings and Improvements	18,582
Gross amount at which carried at close of period, Total	48,391
Accumulated Depreciation and Amortization	$ 1,777
Life on which depreciation in latest income statements is computed	35 years
Dedham Plaza
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 12,287
Initial cost to company, Buildings and Improvements	12,918
Cost Capitalized Subsequent to Acquisition	9,887
Gross amount at which carried at close of period, Land	12,287
Gross amount at which carried at close of period, Buildings and Improvements	22,805
Gross amount at which carried at close of period, Total	35,092
Accumulated Depreciation and Amortization	$ 13,797
Life on which depreciation in latest income statements is computed	35 years
Del Mar Village
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 15,624
Initial cost to company, Buildings and Improvements	41,712
Cost Capitalized Subsequent to Acquisition	3,063
Gross amount at which carried at close of period, Land	15,587
Gross amount at which carried at close of period, Buildings and Improvements	44,812
Gross amount at which carried at close of period, Total	60,399
Accumulated Depreciation and Amortization	$ 17,250
Life on which depreciation in latest income statements is computed	35 years
East Bay Bridge
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 29,079
Initial cost to company, Buildings and Improvements	138,035
Cost Capitalized Subsequent to Acquisition	8,666
Gross amount at which carried at close of period, Land	29,079
Gross amount at which carried at close of period, Buildings and Improvements	146,701
Gross amount at which carried at close of period, Total	175,780
Accumulated Depreciation and Amortization	$ 14,449
Life on which depreciation in latest income statements is computed	35 years
Eastgate
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 1,608
Initial cost to company, Buildings and Improvements	5,775
Cost Capitalized Subsequent to Acquisition	20,754
Gross amount at which carried at close of period, Land	1,608
Gross amount at which carried at close of period, Buildings and Improvements	26,529
Gross amount at which carried at close of period, Total	28,137
Accumulated Depreciation and Amortization	$ 18,307
Life on which depreciation in latest income statements is computed	35 years
Elllisburg
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 4,028
Initial cost to company, Buildings and Improvements	11,309
Cost Capitalized Subsequent to Acquisition	19,590
Gross amount at which carried at close of period, Land	4,013
Gross amount at which carried at close of period, Buildings and Improvements	30,914
Gross amount at which carried at close of period, Total	34,927
Accumulated Depreciation and Amortization	$ 18,354
Life on which depreciation in latest income statements is computed	35 years
Escondido Promenade
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 19,117
Initial cost to company, Buildings and Improvements	15,829
Cost Capitalized Subsequent to Acquisition	12,158
Gross amount at which carried at close of period, Land	19,117
Gross amount at which carried at close of period, Buildings and Improvements	27,987
Gross amount at which carried at close of period, Total	47,104
Accumulated Depreciation and Amortization	$ 13,477
Life on which depreciation in latest income statements is computed	35 years
Falls Plaza
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 1,798
Initial cost to company, Buildings and Improvements	1,270
Cost Capitalized Subsequent to Acquisition	9,779
Gross amount at which carried at close of period, Land	1,819
Gross amount at which carried at close of period, Buildings and Improvements	11,028
Gross amount at which carried at close of period, Total	12,847
Accumulated Depreciation and Amortization	$ 7,928
Life on which depreciation in latest income statements is computed	25 years
Federal Plaza
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 10,216
Initial cost to company, Buildings and Improvements	17,895
Cost Capitalized Subsequent to Acquisition	37,860
Gross amount at which carried at close of period, Land	10,216
Gross amount at which carried at close of period, Buildings and Improvements	55,755
Gross amount at which carried at close of period, Total	65,971
Accumulated Depreciation and Amortization	$ 39,128
Life on which depreciation in latest income statements is computed	35 years
Finley Square
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 9,252
Initial cost to company, Buildings and Improvements	9,544
Cost Capitalized Subsequent to Acquisition	16,032
Gross amount at which carried at close of period, Land	9,252
Gross amount at which carried at close of period, Buildings and Improvements	25,576
Gross amount at which carried at close of period, Total	34,828
Accumulated Depreciation and Amortization	$ 17,459
Life on which depreciation in latest income statements is computed	35 years
Flourtown
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 1,345
Initial cost to company, Buildings and Improvements	3,943
Cost Capitalized Subsequent to Acquisition	11,353
Gross amount at which carried at close of period, Land	1,345
Gross amount at which carried at close of period, Buildings and Improvements	15,296
Gross amount at which carried at close of period, Total	16,641
Accumulated Depreciation and Amortization	$ 4,886
Life on which depreciation in latest income statements is computed	35 years
Fresh Meadows
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 24,625
Initial cost to company, Buildings and Improvements	25,255
Cost Capitalized Subsequent to Acquisition	31,046
Gross amount at which carried at close of period, Land	24,633
Gross amount at which carried at close of period, Buildings and Improvements	56,293
Gross amount at which carried at close of period, Total	80,926
Accumulated Depreciation and Amortization	$ 33,120
Life on which depreciation in latest income statements is computed	35 years
Friendship Center
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 12,696
Initial cost to company, Buildings and Improvements	20,803
Cost Capitalized Subsequent to Acquisition	4,020
Gross amount at which carried at close of period, Land	12,696
Gross amount at which carried at close of period, Buildings and Improvements	24,823
Gross amount at which carried at close of period, Total	37,519
Accumulated Depreciation and Amortization	$ 9,900
Life on which depreciation in latest income statements is computed	35 years
Gaithersburg Square
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 7,701
Initial cost to company, Buildings and Improvements	5,271
Cost Capitalized Subsequent to Acquisition	13,702
Gross amount at which carried at close of period, Land	5,973
Gross amount at which carried at close of period, Buildings and Improvements	20,701
Gross amount at which carried at close of period, Total	26,674
Accumulated Depreciation and Amortization	$ 16,778
Life on which depreciation in latest income statements is computed	35 years
Garden Market
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 2,677
Initial cost to company, Buildings and Improvements	4,829
Cost Capitalized Subsequent to Acquisition	5,387
Gross amount at which carried at close of period, Land	2,677
Gross amount at which carried at close of period, Buildings and Improvements	10,216
Gross amount at which carried at close of period, Total	12,893
Accumulated Depreciation and Amortization	$ 6,540
Life on which depreciation in latest income statements is computed	35 years
Governor Plaza
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 2,068
Initial cost to company, Buildings and Improvements	4,905
Cost Capitalized Subsequent to Acquisition	20,184
Gross amount at which carried at close of period, Land	2,068
Gross amount at which carried at close of period, Buildings and Improvements	25,089
Gross amount at which carried at close of period, Total	27,157
Accumulated Depreciation and Amortization	$ 18,201
Life on which depreciation in latest income statements is computed	35 years
Graham Park Plaza
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 1,237
Initial cost to company, Buildings and Improvements	15,096
Cost Capitalized Subsequent to Acquisition	18,002
Gross amount at which carried at close of period, Land	1,169
Gross amount at which carried at close of period, Buildings and Improvements	33,166
Gross amount at which carried at close of period, Total	34,335
Accumulated Depreciation and Amortization	$ 25,958
Life on which depreciation in latest income statements is computed	35 years
Gratiot Plaza
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 525
Initial cost to company, Buildings and Improvements	1,601
Cost Capitalized Subsequent to Acquisition	17,439
Gross amount at which carried at close of period, Land	525
Gross amount at which carried at close of period, Buildings and Improvements	19,040
Gross amount at which carried at close of period, Total	19,565
Accumulated Depreciation and Amortization	$ 16,001
Life on which depreciation in latest income statements is computed	25 years 9 months
Greenwich Avenue
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 7,484
Initial cost to company, Buildings and Improvements	5,444
Cost Capitalized Subsequent to Acquisition	1,169
Gross amount at which carried at close of period, Land	7,484
Gross amount at which carried at close of period, Buildings and Improvements	6,613
Gross amount at which carried at close of period, Total	14,097
Accumulated Depreciation and Amortization	$ 3,782
Life on which depreciation in latest income statements is computed	35 years
Hauppauge
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 8,791
Initial cost to company, Buildings and Improvements	15,262
Cost Capitalized Subsequent to Acquisition	4,593
Gross amount at which carried at close of period, Land	8,426
Gross amount at which carried at close of period, Buildings and Improvements	20,220
Gross amount at which carried at close of period, Total	28,646
Accumulated Depreciation and Amortization	$ 10,295
Life on which depreciation in latest income statements is computed	35 years
Hermosa Avenue
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 1,116
Initial cost to company, Buildings and Improvements	280
Cost Capitalized Subsequent to Acquisition	4,512
Gross amount at which carried at close of period, Land	1,368
Gross amount at which carried at close of period, Buildings and Improvements	4,540
Gross amount at which carried at close of period, Total	5,908
Accumulated Depreciation and Amortization	$ 2,978
Life on which depreciation in latest income statements is computed	35 years
Hollywood Blvd.
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 8,300
Initial cost to company, Buildings and Improvements	16,920
Cost Capitalized Subsequent to Acquisition	21,199
Gross amount at which carried at close of period, Land	8,300
Gross amount at which carried at close of period, Buildings and Improvements	38,119
Gross amount at which carried at close of period, Total	46,419
Accumulated Depreciation and Amortization	$ 11,765
Life on which depreciation in latest income statements is computed	35 years
Huntington
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 12,195
Initial cost to company, Buildings and Improvements	16,008
Cost Capitalized Subsequent to Acquisition	16,134
Gross amount at which carried at close of period, Land	12,195
Gross amount at which carried at close of period, Buildings and Improvements	32,142
Gross amount at which carried at close of period, Total	44,337
Accumulated Depreciation and Amortization	$ 13,323
Life on which depreciation in latest income statements is computed	35 years
Huntington Square
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 0
Initial cost to company, Buildings and Improvements	10,075
Cost Capitalized Subsequent to Acquisition	2,164
Gross amount at which carried at close of period, Land	0
Gross amount at which carried at close of period, Buildings and Improvements	12,239
Gross amount at which carried at close of period, Total	12,239
Accumulated Depreciation and Amortization	$ 2,236
Life on which depreciation in latest income statements is computed	35 years
Idylwood Plaza
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 4,308
Initial cost to company, Buildings and Improvements	10,026
Cost Capitalized Subsequent to Acquisition	2,402
Gross amount at which carried at close of period, Land	4,308
Gross amount at which carried at close of period, Buildings and Improvements	12,428
Gross amount at which carried at close of period, Total	16,736
Accumulated Depreciation and Amortization	$ 8,031
Life on which depreciation in latest income statements is computed	35 years
Kings Court
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 0
Initial cost to company, Buildings and Improvements	10,714
Cost Capitalized Subsequent to Acquisition	898
Gross amount at which carried at close of period, Land	0
Gross amount at which carried at close of period, Buildings and Improvements	11,612
Gross amount at which carried at close of period, Total	11,612
Accumulated Depreciation and Amortization	$ 7,881
Life on which depreciation in latest income statements is computed	26 years
Lancaster
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 4,907
Initial cost to company, Land	0
Initial cost to company, Buildings and Improvements	2,103
Cost Capitalized Subsequent to Acquisition	11,451
Gross amount at which carried at close of period, Land	75
Gross amount at which carried at close of period, Buildings and Improvements	13,479
Gross amount at which carried at close of period, Total	13,554
Accumulated Depreciation and Amortization	$ 7,714
Life on which depreciation in latest income statements is computed	22 years
Langhorne Square
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 720
Initial cost to company, Buildings and Improvements	2,974
Cost Capitalized Subsequent to Acquisition	18,068
Gross amount at which carried at close of period, Land	720
Gross amount at which carried at close of period, Buildings and Improvements	21,042
Gross amount at which carried at close of period, Total	21,762
Accumulated Depreciation and Amortization	$ 13,690
Life on which depreciation in latest income statements is computed	35 years
Laurel
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 7,458
Initial cost to company, Buildings and Improvements	22,525
Cost Capitalized Subsequent to Acquisition	25,425
Gross amount at which carried at close of period, Land	7,464
Gross amount at which carried at close of period, Buildings and Improvements	47,944
Gross amount at which carried at close of period, Total	55,408
Accumulated Depreciation and Amortization	$ 34,298
Life on which depreciation in latest income statements is computed	35 years
Lawrence Park
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 5,723
Initial cost to company, Buildings and Improvements	7,160
Cost Capitalized Subsequent to Acquisition	19,371
Gross amount at which carried at close of period, Land	5,734
Gross amount at which carried at close of period, Buildings and Improvements	26,520
Gross amount at which carried at close of period, Total	32,254
Accumulated Depreciation and Amortization	$ 23,597
Life on which depreciation in latest income statements is computed	22 years
Leesburg Plaza
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 8,184
Initial cost to company, Buildings and Improvements	10,722
Cost Capitalized Subsequent to Acquisition	17,279
Gross amount at which carried at close of period, Land	8,184
Gross amount at which carried at close of period, Buildings and Improvements	28,001
Gross amount at which carried at close of period, Total	36,185
Accumulated Depreciation and Amortization	$ 13,117
Life on which depreciation in latest income statements is computed	35 years
Linden Square
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 79,382
Initial cost to company, Buildings and Improvements	19,247
Cost Capitalized Subsequent to Acquisition	48,869
Gross amount at which carried at close of period, Land	79,269
Gross amount at which carried at close of period, Buildings and Improvements	68,229
Gross amount at which carried at close of period, Total	147,498
Accumulated Depreciation and Amortization	$ 17,647
Life on which depreciation in latest income statements is computed	35 years
Melville Mall
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 35,622
Initial cost to company, Buildings and Improvements	32,882
Cost Capitalized Subsequent to Acquisition	5,483
Gross amount at which carried at close of period, Land	35,622
Gross amount at which carried at close of period, Buildings and Improvements	38,365
Gross amount at which carried at close of period, Total	73,987
Accumulated Depreciation and Amortization	$ 9,029
Life on which depreciation in latest income statements is computed	35 years
Mercer Mall
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 55,682
Initial cost to company, Land	28,684
Initial cost to company, Buildings and Improvements	48,028
Cost Capitalized Subsequent to Acquisition	42,395
Gross amount at which carried at close of period, Land	28,684
Gross amount at which carried at close of period, Buildings and Improvements	90,423
Gross amount at which carried at close of period, Total	119,107
Accumulated Depreciation and Amortization	$ 33,853
Mercer Mall | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statements is computed	25 years
Mercer Mall | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statements is computed	35 years
Montrose Crossing
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 74,329
Initial cost to company, Land	48,624
Initial cost to company, Buildings and Improvements	91,819
Cost Capitalized Subsequent to Acquisition	13,103
Gross amount at which carried at close of period, Land	48,624
Gross amount at which carried at close of period, Buildings and Improvements	104,922
Gross amount at which carried at close of period, Total	153,546
Accumulated Depreciation and Amortization	$ 16,687
Life on which depreciation in latest income statements is computed	35 years
Mount Vernon/South Valley/7770 Richmond Hwy,
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 10,068
Initial cost to company, Buildings and Improvements	33,501
Cost Capitalized Subsequent to Acquisition	39,297
Gross amount at which carried at close of period, Land	10,230
Gross amount at which carried at close of period, Buildings and Improvements	72,636
Gross amount at which carried at close of period, Total	82,866
Accumulated Depreciation and Amortization	$ 28,716
Life on which depreciation in latest income statements is computed	35 years
Town Center of New Britain
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 1,282
Initial cost to company, Buildings and Improvements	12,285
Cost Capitalized Subsequent to Acquisition	1,390
Gross amount at which carried at close of period, Land	1,379
Gross amount at which carried at close of period, Buildings and Improvements	13,578
Gross amount at which carried at close of period, Total	14,957
Accumulated Depreciation and Amortization	$ 4,197
Life on which depreciation in latest income statements is computed	35 years
North Dartmouth
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 9,366
Initial cost to company, Buildings and Improvements	0
Cost Capitalized Subsequent to Acquisition	0
Gross amount at which carried at close of period, Land	9,366
Gross amount at which carried at close of period, Buildings and Improvements	0
Gross amount at which carried at close of period, Total	9,366
Accumulated Depreciation and Amortization	$ 0
Life on which depreciation in latest income statements is computed
Northeast
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 1,152
Initial cost to company, Buildings and Improvements	10,596
Cost Capitalized Subsequent to Acquisition	13,551
Gross amount at which carried at close of period, Land	1,153
Gross amount at which carried at close of period, Buildings and Improvements	24,146
Gross amount at which carried at close of period, Total	25,299
Accumulated Depreciation and Amortization	$ 18,837
Life on which depreciation in latest income statements is computed	35 years
North Lake Commons
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 2,782
Initial cost to company, Buildings and Improvements	8,604
Cost Capitalized Subsequent to Acquisition	5,044
Gross amount at which carried at close of period, Land	2,628
Gross amount at which carried at close of period, Buildings and Improvements	13,802
Gross amount at which carried at close of period, Total	16,430
Accumulated Depreciation and Amortization	$ 7,557
Life on which depreciation in latest income statements is computed	35 years
Old Keene Mill
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 638
Initial cost to company, Buildings and Improvements	998
Cost Capitalized Subsequent to Acquisition	4,775
Gross amount at which carried at close of period, Land	638
Gross amount at which carried at close of period, Buildings and Improvements	5,773
Gross amount at which carried at close of period, Total	6,411
Accumulated Depreciation and Amortization	$ 5,045
Life on which depreciation in latest income statements is computed	33 years 4 months
Old Town Center
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 3,420
Initial cost to company, Buildings and Improvements	2,765
Cost Capitalized Subsequent to Acquisition	31,655
Gross amount at which carried at close of period, Land	3,420
Gross amount at which carried at close of period, Buildings and Improvements	34,420
Gross amount at which carried at close of period, Total	37,840
Accumulated Depreciation and Amortization	$ 20,669
Life on which depreciation in latest income statements is computed	35 years
Pan Am Shopping Center
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 8,694
Initial cost to company, Buildings and Improvements	12,929
Cost Capitalized Subsequent to Acquisition	7,230
Gross amount at which carried at close of period, Land	8,695
Gross amount at which carried at close of period, Buildings and Improvements	20,158
Gross amount at which carried at close of period, Total	28,853
Accumulated Depreciation and Amortization	$ 13,972
Life on which depreciation in latest income statements is computed	35 years
Pentagon Row
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 0
Initial cost to company, Buildings and Improvements	2,955
Cost Capitalized Subsequent to Acquisition	93,726
Gross amount at which carried at close of period, Land	0
Gross amount at which carried at close of period, Buildings and Improvements	96,681
Gross amount at which carried at close of period, Total	96,681
Accumulated Depreciation and Amortization	$ 40,084
Life on which depreciation in latest income statements is computed	35 years
Perring Plaza
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 2,800
Initial cost to company, Buildings and Improvements	6,461
Cost Capitalized Subsequent to Acquisition	21,156
Gross amount at which carried at close of period, Land	2,800
Gross amount at which carried at close of period, Buildings and Improvements	27,617
Gross amount at which carried at close of period, Total	30,417
Accumulated Depreciation and Amortization	$ 21,389
Life on which depreciation in latest income statements is computed	35 years
Pike & Rose
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 31,471
Initial cost to company, Buildings and Improvements	10,335
Cost Capitalized Subsequent to Acquisition	324,723
Gross amount at which carried at close of period, Land	26,199
Gross amount at which carried at close of period, Buildings and Improvements	340,330
Gross amount at which carried at close of period, Total	366,529
Accumulated Depreciation and Amortization	$ 5,488
Life on which depreciation in latest income statements is computed	50 years
Pike 7
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 14,970
Initial cost to company, Buildings and Improvements	22,799
Cost Capitalized Subsequent to Acquisition	3,945
Gross amount at which carried at close of period, Land	14,914
Gross amount at which carried at close of period, Buildings and Improvements	26,800
Gross amount at which carried at close of period, Total	41,714
Accumulated Depreciation and Amortization	$ 14,907
Life on which depreciation in latest income statements is computed	35 years
Plaza El Segundo/The Point
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 178,313
Initial cost to company, Land	62,127
Initial cost to company, Buildings and Improvements	153,556
Cost Capitalized Subsequent to Acquisition	55,296
Gross amount at which carried at close of period, Land	62,127
Gross amount at which carried at close of period, Buildings and Improvements	208,852
Gross amount at which carried at close of period, Total	270,979
Accumulated Depreciation and Amortization	$ 24,548
Life on which depreciation in latest income statements is computed	35 years
Queen Anne Plaza
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 3,319
Initial cost to company, Buildings and Improvements	8,457
Cost Capitalized Subsequent to Acquisition	6,421
Gross amount at which carried at close of period, Land	3,319
Gross amount at which carried at close of period, Buildings and Improvements	14,878
Gross amount at which carried at close of period, Total	18,197
Accumulated Depreciation and Amortization	$ 8,908
Life on which depreciation in latest income statements is computed	35 years
Quince Orchard Plaza
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 3,197
Initial cost to company, Buildings and Improvements	7,949
Cost Capitalized Subsequent to Acquisition	24,155
Gross amount at which carried at close of period, Land	2,928
Gross amount at which carried at close of period, Buildings and Improvements	32,373
Gross amount at which carried at close of period, Total	35,301
Accumulated Depreciation and Amortization	$ 16,012
Life on which depreciation in latest income statements is computed	35 years
Rockville Town Square
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 4,492
Initial cost to company, Land	0
Initial cost to company, Buildings and Improvements	8,092
Cost Capitalized Subsequent to Acquisition	41,995
Gross amount at which carried at close of period, Land	0
Gross amount at which carried at close of period, Buildings and Improvements	50,087
Gross amount at which carried at close of period, Total	50,087
Accumulated Depreciation and Amortization	$ 13,887
Life on which depreciation in latest income statements is computed	50 years
Rollingwood Apts.
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 21,716
Initial cost to company, Land	552
Initial cost to company, Buildings and Improvements	2,246
Cost Capitalized Subsequent to Acquisition	7,449
Gross amount at which carried at close of period, Land	572
Gross amount at which carried at close of period, Buildings and Improvements	9,675
Gross amount at which carried at close of period, Total	10,247
Accumulated Depreciation and Amortization	$ 8,598
Life on which depreciation in latest income statements is computed	25 years
Sam's Park and Shop
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 4,840
Initial cost to company, Buildings and Improvements	6,319
Cost Capitalized Subsequent to Acquisition	1,395
Gross amount at which carried at close of period, Land	4,840
Gross amount at which carried at close of period, Buildings and Improvements	7,714
Gross amount at which carried at close of period, Total	12,554
Accumulated Depreciation and Amortization	$ 4,634
Life on which depreciation in latest income statements is computed	35 years
San Antonio Center
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 39,920
Initial cost to company, Buildings and Improvements	32,466
Cost Capitalized Subsequent to Acquisition	383
Gross amount at which carried at close of period, Land	39,920
Gross amount at which carried at close of period, Buildings and Improvements	32,849
Gross amount at which carried at close of period, Total	72,769
Accumulated Depreciation and Amortization	$ 1,621
Life on which depreciation in latest income statements is computed	35 years
Santana Row
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 66,682
Initial cost to company, Buildings and Improvements	7,502
Cost Capitalized Subsequent to Acquisition	658,473
Gross amount at which carried at close of period, Land	57,578
Gross amount at which carried at close of period, Buildings and Improvements	675,079
Gross amount at which carried at close of period, Total	732,657
Accumulated Depreciation and Amortization	$ 150,940
Santana Row | Minimum
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statements is computed	40 years
Santana Row | Maximum
Real Estate and Accumulated Depreciation [Line Items]
Life on which depreciation in latest income statements is computed	50 years
Saugus
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 4,383
Initial cost to company, Buildings and Improvements	8,291
Cost Capitalized Subsequent to Acquisition	2,581
Gross amount at which carried at close of period, Land	4,383
Gross amount at which carried at close of period, Buildings and Improvements	10,872
Gross amount at which carried at close of period, Total	15,255
Accumulated Depreciation and Amortization	$ 5,846
Life on which depreciation in latest income statements is computed	35 years
The Avenue at White Marsh
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 52,705
Initial cost to company, Land	20,682
Initial cost to company, Buildings and Improvements	72,432
Cost Capitalized Subsequent to Acquisition	7,028
Gross amount at which carried at close of period, Land	20,685
Gross amount at which carried at close of period, Buildings and Improvements	79,457
Gross amount at which carried at close of period, Total	100,142
Accumulated Depreciation and Amortization	$ 25,294
Life on which depreciation in latest income statements is computed	35 years
The Grove at Shrewsbury
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 56,997
Initial cost to company, Land	18,016
Initial cost to company, Buildings and Improvements	103,115
Cost Capitalized Subsequent to Acquisition	995
Gross amount at which carried at close of period, Land	18,021
Gross amount at which carried at close of period, Buildings and Improvements	104,105
Gross amount at which carried at close of period, Total	122,126
Accumulated Depreciation and Amortization	$ 6,980
Life on which depreciation in latest income statements is computed	35 years
The Shoppes At Nottingham Square
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 4,441
Initial cost to company, Buildings and Improvements	12,849
Cost Capitalized Subsequent to Acquisition	163
Gross amount at which carried at close of period, Land	4,441
Gross amount at which carried at close of period, Buildings and Improvements	13,012
Gross amount at which carried at close of period, Total	17,453
Accumulated Depreciation and Amortization	$ 3,979
Life on which depreciation in latest income statements is computed	35 years
The Shops at Sunset Place
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 75,928
Initial cost to company, Land	64,499
Initial cost to company, Buildings and Improvements	50,853
Cost Capitalized Subsequent to Acquisition	1,229
Gross amount at which carried at close of period, Land	64,499
Gross amount at which carried at close of period, Buildings and Improvements	52,082
Gross amount at which carried at close of period, Total	116,581
Accumulated Depreciation and Amortization	$ 743
Life on which depreciation in latest income statements is computed	35 years
Third Street Promenade
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 22,645
Initial cost to company, Buildings and Improvements	12,709
Cost Capitalized Subsequent to Acquisition	43,181
Gross amount at which carried at close of period, Land	25,125
Gross amount at which carried at close of period, Buildings and Improvements	53,410
Gross amount at which carried at close of period, Total	78,535
Accumulated Depreciation and Amortization	$ 30,043
Life on which depreciation in latest income statements is computed	35 years
Tower
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 7,170
Initial cost to company, Buildings and Improvements	10,518
Cost Capitalized Subsequent to Acquisition	3,764
Gross amount at which carried at close of period, Land	7,280
Gross amount at which carried at close of period, Buildings and Improvements	14,172
Gross amount at which carried at close of period, Total	21,452
Accumulated Depreciation and Amortization	$ 7,878
Life on which depreciation in latest income statements is computed	35 years
Tower Shops
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 29,940
Initial cost to company, Buildings and Improvements	43,390
Cost Capitalized Subsequent to Acquisition	20,045
Gross amount at which carried at close of period, Land	29,962
Gross amount at which carried at close of period, Buildings and Improvements	63,413
Gross amount at which carried at close of period, Total	93,375
Accumulated Depreciation and Amortization	$ 10,777
Life on which depreciation in latest income statements is computed	35 years
Troy
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 3,126
Initial cost to company, Buildings and Improvements	5,193
Cost Capitalized Subsequent to Acquisition	26,281
Gross amount at which carried at close of period, Land	4,311
Gross amount at which carried at close of period, Buildings and Improvements	30,289
Gross amount at which carried at close of period, Total	34,600
Accumulated Depreciation and Amortization	$ 19,580
Life on which depreciation in latest income statements is computed	22 years
Tyson's Station
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 388
Initial cost to company, Buildings and Improvements	453
Cost Capitalized Subsequent to Acquisition	3,752
Gross amount at which carried at close of period, Land	475
Gross amount at which carried at close of period, Buildings and Improvements	4,118
Gross amount at which carried at close of period, Total	4,593
Accumulated Depreciation and Amortization	$ 3,425
Life on which depreciation in latest income statements is computed	17 years
Village at Shirlington
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 6,539
Initial cost to company, Land	9,761
Initial cost to company, Buildings and Improvements	14,808
Cost Capitalized Subsequent to Acquisition	36,838
Gross amount at which carried at close of period, Land	4,234
Gross amount at which carried at close of period, Buildings and Improvements	57,173
Gross amount at which carried at close of period, Total	61,407
Accumulated Depreciation and Amortization	$ 22,623
Life on which depreciation in latest income statements is computed	35 years
Westgate Center
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 6,319
Initial cost to company, Buildings and Improvements	107,284
Cost Capitalized Subsequent to Acquisition	32,392
Gross amount at which carried at close of period, Land	6,319
Gross amount at which carried at close of period, Buildings and Improvements	139,676
Gross amount at which carried at close of period, Total	145,995
Accumulated Depreciation and Amortization	$ 37,056
Life on which depreciation in latest income statements is computed	35 years
White Marsh Plaza
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 3,478
Initial cost to company, Buildings and Improvements	21,413
Cost Capitalized Subsequent to Acquisition	262
Gross amount at which carried at close of period, Land	3,478
Gross amount at which carried at close of period, Buildings and Improvements	21,675
Gross amount at which carried at close of period, Total	25,153
Accumulated Depreciation and Amortization	$ 7,123
Life on which depreciation in latest income statements is computed	35 years
White Marsh Other
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 34,281
Initial cost to company, Buildings and Improvements	1,843
Cost Capitalized Subsequent to Acquisition	925
Gross amount at which carried at close of period, Land	34,311
Gross amount at which carried at close of period, Buildings and Improvements	2,738
Gross amount at which carried at close of period, Total	37,049
Accumulated Depreciation and Amortization	$ 673
Life on which depreciation in latest income statements is computed	35 years
Wildwood
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 9,111
Initial cost to company, Buildings and Improvements	1,061
Cost Capitalized Subsequent to Acquisition	8,793
Gross amount at which carried at close of period, Land	9,111
Gross amount at which carried at close of period, Buildings and Improvements	9,854
Gross amount at which carried at close of period, Total	18,965
Accumulated Depreciation and Amortization	$ 8,191
Life on which depreciation in latest income statements is computed	33 years 4 months
Willow Grove
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 1,499
Initial cost to company, Buildings and Improvements	6,643
Cost Capitalized Subsequent to Acquisition	21,857
Gross amount at which carried at close of period, Land	1,499
Gross amount at which carried at close of period, Buildings and Improvements	28,500
Gross amount at which carried at close of period, Total	29,999
Accumulated Depreciation and Amortization	$ 24,244
Life on which depreciation in latest income statements is computed	35 years
Willow Lawn
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 3,192
Initial cost to company, Buildings and Improvements	7,723
Cost Capitalized Subsequent to Acquisition	79,673
Gross amount at which carried at close of period, Land	7,790
Gross amount at which carried at close of period, Buildings and Improvements	82,798
Gross amount at which carried at close of period, Total	90,588
Accumulated Depreciation and Amortization	$ 52,272
Life on which depreciation in latest income statements is computed	35 years
Wynnewood
Real Estate and Accumulated Depreciation [Line Items]
Initial cost to company, Land	$ 8,055
Initial cost to company, Buildings and Improvements	13,759
Cost Capitalized Subsequent to Acquisition	19,912
Gross amount at which carried at close of period, Land	8,055
Gross amount at which carried at close of period, Buildings and Improvements	33,671
Gross amount at which carried at close of period, Total	41,726
Accumulated Depreciation and Amortization	$ 20,061
Life on which depreciation in latest income statements is computed	35 years