Real Estate And Accumulated Depreciation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 2,260,836
Land	707,037
UPREIT Unit Alloc. Land	14,505	[1]
Initial Cost Buildings, Improvements & Equipment	2,893,195
UPREIT Unit Alloc. Bldg.	140,334	[1]
Costs Capitalized Subsequent to Acquisition	1,287,253
Land	721,542
Total Cost Buildings, Improvements & Equipment	4,320,782
Total	5,042,324	[2]
Accumulated Depreciation	983,759
Total Cost, Net of Accumulated Depreciation	4,058,565		3,535,929
Cost for federal income tax	4,621,394
Assets placed into service	5,887
Corporate office assets	29,064
Construction in progress	64,201		119,992
1200 East West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	1200 East West
Land	13,068
Costs Capitalized Subsequent to Acquisition	70,663
Land	13,068
Total Cost Buildings, Improvements & Equipment	70,663
Total	83,731	[2]
Accumulated Depreciation	3,164
Total Cost, Net of Accumulated Depreciation	80,567
Year of Acquisition or Completion	2010	[3]
Annapolis Roads Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Annapolis Roads Apartments
Encumbrances	23,687
Land	14,400
Initial Cost Buildings, Improvements & Equipment	18,035
Costs Capitalized Subsequent to Acquisition	3,510
Land	14,400
Total Cost Buildings, Improvements & Equipment	21,545
Total	35,945	[2]
Accumulated Depreciation	961
Total Cost, Net of Accumulated Depreciation	34,984
Year of Acquisition or Completion	2010
Arbor Park Of Alexandria [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Arbor Park of Alexandria
Encumbrances	95,968
Land	8,528
UPREIT Unit Alloc. Land	429	[1]
Initial Cost Buildings, Improvements & Equipment	58,912
UPREIT Unit Alloc. Bldg.	4,286	[1]
Costs Capitalized Subsequent to Acquisition	34,799
Land	8,957
Total Cost Buildings, Improvements & Equipment	97,997
Total	106,954	[2]
Accumulated Depreciation	29,907
Total Cost, Net of Accumulated Depreciation	77,047
Year of Acquisition or Completion	2000
Barrington Gardens [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Barrington Gardens
Encumbrances	10,802
Land	888
UPREIT Unit Alloc. Land	35	[1]
Initial Cost Buildings, Improvements & Equipment	6,658
UPREIT Unit Alloc. Bldg.	296	[1]
Costs Capitalized Subsequent to Acquisition	5,943
Land	923
Total Cost Buildings, Improvements & Equipment	12,897
Total	13,820	[2]
Accumulated Depreciation	3,035
Total Cost, Net of Accumulated Depreciation	10,785
Year of Acquisition or Completion	2005
Bayview & Colonial [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Bayview & Colonial
Land	1,600
UPREIT Unit Alloc. Land	72	[1]
Initial Cost Buildings, Improvements & Equipment	8,471
UPREIT Unit Alloc. Bldg.	709	[1]
Costs Capitalized Subsequent to Acquisition	5,322
Land	1,672
Total Cost Buildings, Improvements & Equipment	14,502
Total	16,174	[2]
Accumulated Depreciation	5,125
Total Cost, Net of Accumulated Depreciation	11,049
Year of Acquisition or Completion	2000
Blackhawk Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Blackhawk Apartments
Land	2,968
UPREIT Unit Alloc. Land	83	[1]
Initial Cost Buildings, Improvements & Equipment	14,568
UPREIT Unit Alloc. Bldg.	858	[1]
Costs Capitalized Subsequent to Acquisition	7,550
Land	3,051
Total Cost Buildings, Improvements & Equipment	22,976
Total	26,027	[2]
Accumulated Depreciation	8,021
Total Cost, Net of Accumulated Depreciation	18,006
Year of Acquisition or Completion	2000
Bonnie Ridge Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Bonnie Ridge Apartments
Encumbrances	51,961
Land	4,830
UPREIT Unit Alloc. Land	411	[1]
Initial Cost Buildings, Improvements & Equipment	42,769
UPREIT Unit Alloc. Bldg.	4,147	[1]
Costs Capitalized Subsequent to Acquisition	35,302
Land	5,241
Total Cost Buildings, Improvements & Equipment	82,218
Total	87,459	[2]
Accumulated Depreciation	31,815
Total Cost, Net of Accumulated Depreciation	55,644
Year of Acquisition or Completion	1999
Braddock Lee Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Braddock Lee Apartments
Land	3,810
UPREIT Unit Alloc. Land	152	[1]
Initial Cost Buildings, Improvements & Equipment	8,842
UPREIT Unit Alloc. Bldg.	1,488	[1]
Costs Capitalized Subsequent to Acquisition	8,182
Land	3,962
Total Cost Buildings, Improvements & Equipment	18,512
Total	22,474	[2]
Accumulated Depreciation	7,833
Total Cost, Net of Accumulated Depreciation	14,641
Year of Acquisition or Completion	1998
Cambridge Village Associates [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Cambridge Village Associates
Land	2,460
UPREIT Unit Alloc. Land	54	[1]
Initial Cost Buildings, Improvements & Equipment	3,188
UPREIT Unit Alloc. Bldg.	520	[1]
Costs Capitalized Subsequent to Acquisition	2,482
Land	2,514
Total Cost Buildings, Improvements & Equipment	6,190
Total	8,704	[2]
Accumulated Depreciation	1,984
Total Cost, Net of Accumulated Depreciation	6,720
Year of Acquisition or Completion	2002
Canterbury Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Canterbury Apartments
Encumbrances	42,472
Land	4,944
UPREIT Unit Alloc. Land	235	[1]
Initial Cost Buildings, Improvements & Equipment	21,384
UPREIT Unit Alloc. Bldg.	2,353	[1]
Costs Capitalized Subsequent to Acquisition	13,667
Land	5,179
Total Cost Buildings, Improvements & Equipment	37,404
Total	42,583	[2]
Accumulated Depreciation	12,934
Total Cost, Net of Accumulated Depreciation	29,649
Year of Acquisition or Completion	1999
Castle Club Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Castle Club Apartments
Encumbrances	6,070
Land	948
UPREIT Unit Alloc. Land	57	[1]
Initial Cost Buildings, Improvements & Equipment	8,933
UPREIT Unit Alloc. Bldg.	566	[1]
Costs Capitalized Subsequent to Acquisition	6,402
Land	1,005
Total Cost Buildings, Improvements & Equipment	15,901
Total	16,906	[2]
Accumulated Depreciation	5,316
Total Cost, Net of Accumulated Depreciation	11,590
Year of Acquisition or Completion	2000
Charleston Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Charleston Place
Encumbrances	74,610
Land	22,764
Initial Cost Buildings, Improvements & Equipment	84,648
Costs Capitalized Subsequent to Acquisition	3,614
Land	22,764
Total Cost Buildings, Improvements & Equipment	88,262
Total	111,026	[2]
Accumulated Depreciation	3,223
Total Cost, Net of Accumulated Depreciation	107,803
Year of Acquisition or Completion	2010
Chatham Hill Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Chatham Hill Apartments
Encumbrances	43,827
Land	1,848
UPREIT Unit Alloc. Land	286	[1]
Initial Cost Buildings, Improvements & Equipment	46,150
UPREIT Unit Alloc. Bldg.	2,434	[1]
Costs Capitalized Subsequent to Acquisition	14,197
Land	2,134
Total Cost Buildings, Improvements & Equipment	62,781
Total	64,915	[2]
Accumulated Depreciation	13,751
Total Cost, Net of Accumulated Depreciation	51,164
Year of Acquisition or Completion	2004
Chesterfield Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Chesterfield Apartments
Land	1,482
UPREIT Unit Alloc. Land	89	[1]
Initial Cost Buildings, Improvements & Equipment	8,206
UPREIT Unit Alloc. Bldg.	869	[1]
Costs Capitalized Subsequent to Acquisition	9,183
Land	1,571
Total Cost Buildings, Improvements & Equipment	18,258
Total	19,829	[2]
Accumulated Depreciation	7,211
Total Cost, Net of Accumulated Depreciation	12,618
Year of Acquisition or Completion	1997
Cider Mill [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Cider Mill
Encumbrances	61,497
Land	15,552
UPREIT Unit Alloc. Land	464	[1]
Initial Cost Buildings, Improvements & Equipment	65,939
UPREIT Unit Alloc. Bldg.	4,549	[1]
Costs Capitalized Subsequent to Acquisition	15,269
Land	16,016
Total Cost Buildings, Improvements & Equipment	85,757
Total	101,773	[2]
Accumulated Depreciation	22,881
Total Cost, Net of Accumulated Depreciation	78,892
Year of Acquisition or Completion	2002
Cinnamon Run Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Cinnamon Run Apartments
Encumbrances	54,280
Land	7,731
UPREIT Unit Alloc. Land	231	[1]
Initial Cost Buildings, Improvements & Equipment	59,693
UPREIT Unit Alloc. Bldg.	1,934	[1]
Costs Capitalized Subsequent to Acquisition	7,429
Land	7,962
Total Cost Buildings, Improvements & Equipment	69,056
Total	77,018	[2]
Accumulated Depreciation	11,878
Total Cost, Net of Accumulated Depreciation	65,140
Year of Acquisition or Completion	2005
Country Village Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Country Village Apartments
Encumbrances	18,338
Land	2,236
UPREIT Unit Alloc. Land	113	[1]
Initial Cost Buildings, Improvements & Equipment	11,149
UPREIT Unit Alloc. Bldg.	1,120	[1]
Costs Capitalized Subsequent to Acquisition	10,967
Land	2,349
Total Cost Buildings, Improvements & Equipment	23,236
Total	25,585	[2]
Accumulated Depreciation	9,635
Total Cost, Net of Accumulated Depreciation	15,950
Year of Acquisition or Completion	1998
Courts At Huntington Station [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Courts at Huntington Station
Land	33,409
Costs Capitalized Subsequent to Acquisition	88,548
Land	33,409
Total Cost Buildings, Improvements & Equipment	88,548
Total	121,957	[2]
Accumulated Depreciation	2,503
Total Cost, Net of Accumulated Depreciation	119,454
Year of Acquisition or Completion	2011	[3]
Courtyards Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Courtyards Village
Land	3,360
UPREIT Unit Alloc. Land	53	[1]
Initial Cost Buildings, Improvements & Equipment	9,824
UPREIT Unit Alloc. Bldg.	525	[1]
Costs Capitalized Subsequent to Acquisition	4,871
Land	3,413
Total Cost Buildings, Improvements & Equipment	15,220
Total	18,633	[2]
Accumulated Depreciation	4,753
Total Cost, Net of Accumulated Depreciation	13,880
Year of Acquisition or Completion	2001
Crescent Club Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Crescent Club Apartments
Land	2,338
Initial Cost Buildings, Improvements & Equipment	28,792
Costs Capitalized Subsequent to Acquisition	2,488
Land	2,338
Total Cost Buildings, Improvements & Equipment	31,280
Total	33,618	[2]
Accumulated Depreciation	1,136
Total Cost, Net of Accumulated Depreciation	32,482
Year of Acquisition or Completion	2010
Curren Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Curren Terrace
Encumbrances	22,766
Land	1,908
UPREIT Unit Alloc. Land	109	[1]
Initial Cost Buildings, Improvements & Equipment	10,957
UPREIT Unit Alloc. Bldg.	1,082	[1]
Costs Capitalized Subsequent to Acquisition	8,405
Land	2,017
Total Cost Buildings, Improvements & Equipment	20,444
Total	22,461	[2]
Accumulated Depreciation	8,926
Total Cost, Net of Accumulated Depreciation	13,535
Year of Acquisition or Completion	1997
Cypress Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Cypress Place
Encumbrances	10,068
Land	2,304
UPREIT Unit Alloc. Land	45	[1]
Initial Cost Buildings, Improvements & Equipment	7,861
UPREIT Unit Alloc. Bldg.	479	[1]
Costs Capitalized Subsequent to Acquisition	5,335
Land	2,349
Total Cost Buildings, Improvements & Equipment	13,675
Total	16,024	[2]
Accumulated Depreciation	4,749
Total Cost, Net of Accumulated Depreciation	11,275
Year of Acquisition or Completion	2000
Devonshire Hills [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Devonshire Hills
Encumbrances	75,212
Land	27,415
UPREIT Unit Alloc. Land	572	[1]
Initial Cost Buildings, Improvements & Equipment	66,713
UPREIT Unit Alloc. Bldg.	5,727	[1]
Costs Capitalized Subsequent to Acquisition	22,076
Land	27,987
Total Cost Buildings, Improvements & Equipment	94,516
Total	122,503	[2]
Accumulated Depreciation	25,689
Total Cost, Net of Accumulated Depreciation	96,814
Year of Acquisition or Completion	2001
Dunfield Townhomes [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Dunfield Townhomes
Encumbrances	11,462
Land	1,683
Initial Cost Buildings, Improvements & Equipment	30,302
Costs Capitalized Subsequent to Acquisition	6,268
Land	1,683
Total Cost Buildings, Improvements & Equipment	36,570
Total	38,253	[2]
Accumulated Depreciation	4,521
Total Cost, Net of Accumulated Depreciation	33,732
Year of Acquisition or Completion	2007
East Hill Gardens [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	East Hill Gardens
Land	231
UPREIT Unit Alloc. Land	24	[1]
Initial Cost Buildings, Improvements & Equipment	1,560
UPREIT Unit Alloc. Bldg.	241	[1]
Costs Capitalized Subsequent to Acquisition	1,504
Land	255
Total Cost Buildings, Improvements & Equipment	3,305
Total	3,560	[2]
Accumulated Depreciation	1,306
Total Cost, Net of Accumulated Depreciation	2,254
Year of Acquisition or Completion	1998
East Meadow Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	East Meadow Apartments
Encumbrances	14,558
Land	2,250
UPREIT Unit Alloc. Land	89	[1]
Initial Cost Buildings, Improvements & Equipment	10,803
UPREIT Unit Alloc. Bldg.	863	[1]
Costs Capitalized Subsequent to Acquisition	3,725
Land	2,339
Total Cost Buildings, Improvements & Equipment	15,391
Total	17,730	[2]
Accumulated Depreciation	4,557
Total Cost, Net of Accumulated Depreciation	13,173
Year of Acquisition or Completion	2000
Elmwood Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Elmwood Terrace
Encumbrances	26,431
Land	6,048
UPREIT Unit Alloc. Land	155	[1]
Initial Cost Buildings, Improvements & Equipment	14,680
UPREIT Unit Alloc. Bldg.	1,561	[1]
Costs Capitalized Subsequent to Acquisition	11,809
Land	6,203
Total Cost Buildings, Improvements & Equipment	28,050
Total	34,253	[2]
Accumulated Depreciation	9,625
Total Cost, Net of Accumulated Depreciation	24,628
Year of Acquisition or Completion	2000
Falcon Crest Townhomes [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Falcon Crest Townhomes
Encumbrances	18,555
Land	2,772
UPREIT Unit Alloc. Land	161	[1]
Initial Cost Buildings, Improvements & Equipment	11,116
UPREIT Unit Alloc. Bldg.	1,590	[1]
Costs Capitalized Subsequent to Acquisition	10,258
Land	2,933
Total Cost Buildings, Improvements & Equipment	22,964
Total	25,897	[2]
Accumulated Depreciation	8,536
Total Cost, Net of Accumulated Depreciation	17,361
Year of Acquisition or Completion	1999
Falkland Chase Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Falkland Chase Apartments
Encumbrances	35,421
Land	9,000
UPREIT Unit Alloc. Land	327	[1]
Initial Cost Buildings, Improvements & Equipment	49,753
UPREIT Unit Alloc. Bldg.	3,008	[1]
Costs Capitalized Subsequent to Acquisition	6,692
Land	9,327
Total Cost Buildings, Improvements & Equipment	59,453
Total	68,780	[2]
Accumulated Depreciation	13,223
Total Cost, Net of Accumulated Depreciation	55,557
Year of Acquisition or Completion	2003
Fox Hall Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Fox Hall Apartments
Encumbrances	47,000
Land	9,959
Initial Cost Buildings, Improvements & Equipment	51,874
Costs Capitalized Subsequent to Acquisition	12,708
Land	9,959
Total Cost Buildings, Improvements & Equipment	64,582
Total	74,541	[2]
Accumulated Depreciation	9,502
Total Cost, Net of Accumulated Depreciation	65,039
Year of Acquisition or Completion	2007
Gardencrest Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Gardencrest Apartments
Land	24,674
UPREIT Unit Alloc. Land	507	[1]
Initial Cost Buildings, Improvements & Equipment	61,526
UPREIT Unit Alloc. Bldg.	4,974	[1]
Costs Capitalized Subsequent to Acquisition	24,490
Land	25,181
Total Cost Buildings, Improvements & Equipment	90,990
Total	116,171	[2]
Accumulated Depreciation	25,726
Total Cost, Net of Accumulated Depreciation	90,445
Year of Acquisition or Completion	2002
Gateway Village Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Gateway Village Apartments
Encumbrances	6,224
Land	1,320
UPREIT Unit Alloc. Land	71	[1]
Initial Cost Buildings, Improvements & Equipment	6,621
UPREIT Unit Alloc. Bldg.	695	[1]
Costs Capitalized Subsequent to Acquisition	3,146
Land	1,391
Total Cost Buildings, Improvements & Equipment	10,462
Total	11,853	[2]
Accumulated Depreciation	3,691
Total Cost, Net of Accumulated Depreciation	8,162
Year of Acquisition or Completion	1999
Glen Brook Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Glen Brook Apartments
Land	1,414
UPREIT Unit Alloc. Land	46	[1]
Initial Cost Buildings, Improvements & Equipment	4,816
UPREIT Unit Alloc. Bldg.	452	[1]
Costs Capitalized Subsequent to Acquisition	5,124
Land	1,460
Total Cost Buildings, Improvements & Equipment	10,392
Total	11,852	[2]
Accumulated Depreciation	3,674
Total Cost, Net of Accumulated Depreciation	8,178
Year of Acquisition or Completion	1999
Glen Manor Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Glen Manor Apartments
Encumbrances	7,824
Land	1,044
UPREIT Unit Alloc. Land	44	[1]
Initial Cost Buildings, Improvements & Equipment	4,565
UPREIT Unit Alloc. Bldg.	440	[1]
Costs Capitalized Subsequent to Acquisition	3,928
Land	1,088
Total Cost Buildings, Improvements & Equipment	8,933
Total	10,021	[2]
Accumulated Depreciation	3,398
Total Cost, Net of Accumulated Depreciation	6,623
Year of Acquisition or Completion	1997
Golf Club Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Golf Club Apartments
Encumbrances	32,453
Land	3,990
UPREIT Unit Alloc. Land	187	[1]
Initial Cost Buildings, Improvements & Equipment	21,298
UPREIT Unit Alloc. Bldg.	1,840	[1]
Costs Capitalized Subsequent to Acquisition	15,773
Land	4,177
Total Cost Buildings, Improvements & Equipment	38,911
Total	43,088	[2]
Accumulated Depreciation	13,802
Total Cost, Net of Accumulated Depreciation	29,286
Year of Acquisition or Completion	2000
Hackensack Gardens [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Hackensack Gardens
Encumbrances	8,466
Land	2,376
UPREIT Unit Alloc. Land	50	[1]
Initial Cost Buildings, Improvements & Equipment	10,900
UPREIT Unit Alloc. Bldg.	423	[1]
Costs Capitalized Subsequent to Acquisition	6,372
Land	2,426
Total Cost Buildings, Improvements & Equipment	17,695
Total	20,121	[2]
Accumulated Depreciation	3,917
Total Cost, Net of Accumulated Depreciation	16,204
Year of Acquisition or Completion	2005
Hawthorne Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Hawthorne Court
Encumbrances	33,771
Land	8,940
UPREIT Unit Alloc. Land	260	[1]
Initial Cost Buildings, Improvements & Equipment	23,446
UPREIT Unit Alloc. Bldg.	2,521	[1]
Costs Capitalized Subsequent to Acquisition	20,567
Land	9,200
Total Cost Buildings, Improvements & Equipment	46,534
Total	55,734	[2]
Accumulated Depreciation	13,751
Total Cost, Net of Accumulated Depreciation	41,983
Year of Acquisition or Completion	2002
Heritage Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Heritage Square
Land	2,000
UPREIT Unit Alloc. Land	58	[1]
Initial Cost Buildings, Improvements & Equipment	4,805
UPREIT Unit Alloc. Bldg.	566	[1]
Costs Capitalized Subsequent to Acquisition	2,900
Land	2,058
Total Cost Buildings, Improvements & Equipment	8,271
Total	10,329	[2]
Accumulated Depreciation	2,394
Total Cost, Net of Accumulated Depreciation	7,935
Year of Acquisition or Completion	2002
Heritage Woods [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Heritage Woods
Encumbrances	14,326
Land	1,602
Initial Cost Buildings, Improvements & Equipment	12,420
Costs Capitalized Subsequent to Acquisition	3,775
Land	1,602
Total Cost Buildings, Improvements & Equipment	16,195
Total	17,797	[2]
Accumulated Depreciation	2,688
Total Cost, Net of Accumulated Depreciation	15,109
Year of Acquisition or Completion	2006
Highland House Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Highland House Apartments
Encumbrances	5,741
Land	3,414
Initial Cost Buildings, Improvements & Equipment	14,761
Costs Capitalized Subsequent to Acquisition	2,517
Land	3,414
Total Cost Buildings, Improvements & Equipment	17,278
Total	20,692	[2]
Accumulated Depreciation	2,795
Total Cost, Net of Accumulated Depreciation	17,897
Year of Acquisition or Completion	2006
Hill Brook Place Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Hill Brook Place Apartments
Encumbrances	12,572
Land	2,192
UPREIT Unit Alloc. Land	85	[1]
Initial Cost Buildings, Improvements & Equipment	9,118
UPREIT Unit Alloc. Bldg.	848	[1]
Costs Capitalized Subsequent to Acquisition	8,986
Land	2,277
Total Cost Buildings, Improvements & Equipment	18,952
Total	21,229	[2]
Accumulated Depreciation	6,336
Total Cost, Net of Accumulated Depreciation	14,893
Year of Acquisition or Completion	1999
Holiday Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Holiday Square
Land	3,575
UPREIT Unit Alloc. Land	77	[1]
Initial Cost Buildings, Improvements & Equipment	6,108
UPREIT Unit Alloc. Bldg.	722	[1]
Costs Capitalized Subsequent to Acquisition	2,514
Land	3,652
Total Cost Buildings, Improvements & Equipment	9,344
Total	12,996	[2]
Accumulated Depreciation	2,462
Total Cost, Net of Accumulated Depreciation	10,534
Year of Acquisition or Completion	2002
Home Properties Of Bryn Mawr [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Home Properties of Bryn Mawr
Encumbrances	17,138
Land	3,160
UPREIT Unit Alloc. Land	154	[1]
Initial Cost Buildings, Improvements & Equipment	17,956
UPREIT Unit Alloc. Bldg.	1,537	[1]
Costs Capitalized Subsequent to Acquisition	16,243
Land	3,314
Total Cost Buildings, Improvements & Equipment	35,736
Total	39,050	[2]
Accumulated Depreciation	11,317
Total Cost, Net of Accumulated Depreciation	27,733
Year of Acquisition or Completion	2000
Home Properties Of Devon [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Home Properties of Devon
Encumbrances	60,116
Land	6,280
UPREIT Unit Alloc. Land	332	[1]
Initial Cost Buildings, Improvements & Equipment	35,643
UPREIT Unit Alloc. Bldg.	3,280	[1]
Costs Capitalized Subsequent to Acquisition	31,563
Land	6,612
Total Cost Buildings, Improvements & Equipment	70,486
Total	77,098	[2]
Accumulated Depreciation	24,008
Total Cost, Net of Accumulated Depreciation	53,090
Year of Acquisition or Completion	2000
Hunters Glen [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Hunters Glen
Land	2,239
Initial Cost Buildings, Improvements & Equipment	4,729
Costs Capitalized Subsequent to Acquisition	431
Land	2,239
Total Cost Buildings, Improvements & Equipment	5,160
Total	7,399	[2]
Accumulated Depreciation	114
Total Cost, Net of Accumulated Depreciation	7,285
Year of Acquisition or Completion	2011
Jacob Ford Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Jacob Ford Village
Land	6,750
Initial Cost Buildings, Improvements & Equipment	20,022
Costs Capitalized Subsequent to Acquisition	8,146
Land	6,750
Total Cost Buildings, Improvements & Equipment	28,168
Total	34,918	[2]
Accumulated Depreciation	4,356
Total Cost, Net of Accumulated Depreciation	30,562
Year of Acquisition or Completion	2007
Lake Grove Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Lake Grove Apartments
Land	7,360
UPREIT Unit Alloc. Land	254	[1]
Initial Cost Buildings, Improvements & Equipment	11,952
UPREIT Unit Alloc. Bldg.	2,557	[1]
Costs Capitalized Subsequent to Acquisition	17,178
Land	7,614
Total Cost Buildings, Improvements & Equipment	31,687
Total	39,301	[2]
Accumulated Depreciation	13,900
Total Cost, Net of Accumulated Depreciation	25,401
Year of Acquisition or Completion	1997
Lakeview Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Lakeview Apartments
Encumbrances	8,975
Land	636
UPREIT Unit Alloc. Land	59	[1]
Initial Cost Buildings, Improvements & Equipment	4,552
UPREIT Unit Alloc. Bldg.	590	[1]
Costs Capitalized Subsequent to Acquisition	4,145
Land	695
Total Cost Buildings, Improvements & Equipment	9,287
Total	9,982	[2]
Accumulated Depreciation	3,643
Total Cost, Net of Accumulated Depreciation	6,339
Year of Acquisition or Completion	1998
Lakeview Townhomes [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Lakeview Townhomes
Land	1,118
Initial Cost Buildings, Improvements & Equipment	13,335
Costs Capitalized Subsequent to Acquisition	1,200
Land	1,118
Total Cost Buildings, Improvements & Equipment	14,535
Total	15,653	[2]
Accumulated Depreciation	500
Total Cost, Net of Accumulated Depreciation	15,153
Year of Acquisition or Completion	2010
Liberty Commons [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Liberty Commons
Land	1,330
UPREIT Unit Alloc. Land	15	[1]
UPREIT Unit Alloc. Bldg.	125	[1]
Costs Capitalized Subsequent to Acquisition	13,354
Land	1,345
Total Cost Buildings, Improvements & Equipment	13,479
Total	14,824	[2]
Accumulated Depreciation	4,099
Total Cost, Net of Accumulated Depreciation	10,725
Year of Acquisition or Completion	2005	[3]
Liberty Place Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Liberty Place Apartments
Encumbrances	5,718
Land	2,033
Initial Cost Buildings, Improvements & Equipment	13,125
Costs Capitalized Subsequent to Acquisition	2,628
Land	2,033
Total Cost Buildings, Improvements & Equipment	15,753
Total	17,786	[2]
Accumulated Depreciation	2,565
Total Cost, Net of Accumulated Depreciation	15,221
Year of Acquisition or Completion	2006
Mid-Island Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Mid-Island Apartments
Encumbrances	19,161
Land	4,160
UPREIT Unit Alloc. Land	128	[1]
Initial Cost Buildings, Improvements & Equipment	6,567
UPREIT Unit Alloc. Bldg.	1,268	[1]
Costs Capitalized Subsequent to Acquisition	7,171
Land	4,288
Total Cost Buildings, Improvements & Equipment	15,006
Total	19,294	[2]
Accumulated Depreciation	6,506
Total Cost, Net of Accumulated Depreciation	12,788
Year of Acquisition or Completion	1997
Middlebrooke Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Middlebrooke Apartments
Land	2,888
Initial Cost Buildings, Improvements & Equipment	14,369
Costs Capitalized Subsequent to Acquisition	2,128
Land	2,888
Total Cost Buildings, Improvements & Equipment	16,497
Total	19,385	[2]
Accumulated Depreciation	845
Total Cost, Net of Accumulated Depreciation	18,540
Year of Acquisition or Completion	2010
Mill Towne Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Mill Towne Village
Encumbrances	24,239
Land	3,840
UPREIT Unit Alloc. Land	154	[1]
Initial Cost Buildings, Improvements & Equipment	13,279
UPREIT Unit Alloc. Bldg.	1,486	[1]
Costs Capitalized Subsequent to Acquisition	13,442
Land	3,994
Total Cost Buildings, Improvements & Equipment	28,207
Total	32,201	[2]
Accumulated Depreciation	9,617
Total Cost, Net of Accumulated Depreciation	22,584
Year of Acquisition or Completion	2001
Morningside Heights Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Morningside Heights Apartments
Land	6,147
UPREIT Unit Alloc. Land	406	[1]
Initial Cost Buildings, Improvements & Equipment	28,699
UPREIT Unit Alloc. Bldg.	4,000	[1]
Costs Capitalized Subsequent to Acquisition	31,191
Land	6,553
Total Cost Buildings, Improvements & Equipment	63,890
Total	70,443	[2]
Accumulated Depreciation	26,919
Total Cost, Net of Accumulated Depreciation	43,524
Year of Acquisition or Completion	1998
Mount Vernon Square Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Mount Vernon Square Apartments
Land	55,810
Initial Cost Buildings, Improvements & Equipment	86,946
Costs Capitalized Subsequent to Acquisition	16,101
Land	55,810
Total Cost Buildings, Improvements & Equipment	103,047
Total	158,857	[2]
Accumulated Depreciation	15,932
Total Cost, Net of Accumulated Depreciation	142,925
Year of Acquisition or Completion	2006
New Orleans Park Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	New Orleans Park Apartments
Encumbrances	23,321
Land	2,920
UPREIT Unit Alloc. Land	124	[1]
Initial Cost Buildings, Improvements & Equipment	13,215
UPREIT Unit Alloc. Bldg.	1,227	[1]
Costs Capitalized Subsequent to Acquisition	13,390
Land	3,044
Total Cost Buildings, Improvements & Equipment	27,832
Total	30,876	[2]
Accumulated Depreciation	10,901
Total Cost, Net of Accumulated Depreciation	19,975
Year of Acquisition or Completion	1997&1999
Newport Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Newport Village
Land	56,501
Initial Cost Buildings, Improvements & Equipment	147,420
Costs Capitalized Subsequent to Acquisition	426
Land	56,501
Total Cost Buildings, Improvements & Equipment	147,846
Total	204,347	[2]
Accumulated Depreciation	969
Total Cost, Net of Accumulated Depreciation	203,378
Year of Acquisition or Completion	2011
Northwood Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Northwood Apartments
Encumbrances	10,379
Land	804
UPREIT Unit Alloc. Land	71	[1]
Initial Cost Buildings, Improvements & Equipment	14,299
UPREIT Unit Alloc. Bldg.	602	[1]
Costs Capitalized Subsequent to Acquisition	4,236
Land	875
Total Cost Buildings, Improvements & Equipment	19,137
Total	20,012	[2]
Accumulated Depreciation	4,131
Total Cost, Net of Accumulated Depreciation	15,881
Year of Acquisition or Completion	2004
Oak Manor Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Oak Manor Apartments
Encumbrances	6,923
Land	616
UPREIT Unit Alloc. Land	70	[1]
Initial Cost Buildings, Improvements & Equipment	4,111
UPREIT Unit Alloc. Bldg.	690	[1]
Costs Capitalized Subsequent to Acquisition	3,564
Land	686
Total Cost Buildings, Improvements & Equipment	8,365
Total	9,051	[2]
Accumulated Depreciation	3,320
Total Cost, Net of Accumulated Depreciation	5,731
Year of Acquisition or Completion	1998
Owings Run Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Owings Run Apartments
Encumbrances	41,485
Land	5,533
UPREIT Unit Alloc. Land	255	[1]
Initial Cost Buildings, Improvements & Equipment	32,622
UPREIT Unit Alloc. Bldg.	2,538	[1]
Costs Capitalized Subsequent to Acquisition	8,764
Land	5,788
Total Cost Buildings, Improvements & Equipment	43,924
Total	49,712	[2]
Accumulated Depreciation	14,681
Total Cost, Net of Accumulated Depreciation	35,031
Year of Acquisition or Completion	1999
Park Shirlington Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Park Shirlington Apartments
Encumbrances	21,095
Land	4,410
UPREIT Unit Alloc. Land	157	[1]
Initial Cost Buildings, Improvements & Equipment	10,180
UPREIT Unit Alloc. Bldg.	1,581	[1]
Costs Capitalized Subsequent to Acquisition	8,864
Land	4,567
Total Cost Buildings, Improvements & Equipment	20,625
Total	25,192	[2]
Accumulated Depreciation	9,235
Total Cost, Net of Accumulated Depreciation	15,957
Year of Acquisition or Completion	1998
Peppertree Farm Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Peppertree Farm Apartments
Encumbrances	77,549
Land	12,571
UPREIT Unit Alloc. Land	317	[1]
Initial Cost Buildings, Improvements & Equipment	83,804
UPREIT Unit Alloc. Bldg.	2,654	[1]
Costs Capitalized Subsequent to Acquisition	18,104
Land	12,888
Total Cost Buildings, Improvements & Equipment	104,562
Total	117,450	[2]
Accumulated Depreciation	18,900
Total Cost, Net of Accumulated Depreciation	98,550
Year of Acquisition or Completion	2005
Pleasant View Gardens [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Pleasant View Gardens
Encumbrances	94,933
Land	5,710
UPREIT Unit Alloc. Land	499	[1]
Initial Cost Buildings, Improvements & Equipment	47,816
UPREIT Unit Alloc. Bldg.	5,021	[1]
Costs Capitalized Subsequent to Acquisition	30,289
Land	6,209
Total Cost Buildings, Improvements & Equipment	83,126
Total	89,335	[2]
Accumulated Depreciation	31,170
Total Cost, Net of Accumulated Depreciation	58,165
Year of Acquisition or Completion	1998
Pleasure Bay Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Pleasure Bay Apartments
Land	1,620
UPREIT Unit Alloc. Land	124	[1]
Initial Cost Buildings, Improvements & Equipment	6,234
UPREIT Unit Alloc. Bldg.	1,210	[1]
Costs Capitalized Subsequent to Acquisition	9,440
Land	1,744
Total Cost Buildings, Improvements & Equipment	16,884
Total	18,628	[2]
Accumulated Depreciation	6,483
Total Cost, Net of Accumulated Depreciation	12,145
Year of Acquisition or Completion	1998
Racquet Club East Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Racquet Club East Apartments
Encumbrances	37,315
Land	1,868
UPREIT Unit Alloc. Land	218	[1]
Initial Cost Buildings, Improvements & Equipment	23,107
UPREIT Unit Alloc. Bldg.	2,137	[1]
Costs Capitalized Subsequent to Acquisition	13,822
Land	2,086
Total Cost Buildings, Improvements & Equipment	39,066
Total	41,152	[2]
Accumulated Depreciation	13,781
Total Cost, Net of Accumulated Depreciation	27,371
Year of Acquisition or Completion	1998
Racquet Club South [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Racquet Club South
Land	309
UPREIT Unit Alloc. Land	35	[1]
Initial Cost Buildings, Improvements & Equipment	3,891
UPREIT Unit Alloc. Bldg.	353	[1]
Costs Capitalized Subsequent to Acquisition	2,728
Land	344
Total Cost Buildings, Improvements & Equipment	6,972
Total	7,316	[2]
Accumulated Depreciation	2,779
Total Cost, Net of Accumulated Depreciation	4,537
Year of Acquisition or Completion	1999
Redbank Village Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Redbank Village Apartments
Encumbrances	15,455
Land	2,000
UPREIT Unit Alloc. Land	164	[1]
Initial Cost Buildings, Improvements & Equipment	14,030
UPREIT Unit Alloc. Bldg.	1,686	[1]
Costs Capitalized Subsequent to Acquisition	12,192
Land	2,164
Total Cost Buildings, Improvements & Equipment	27,908
Total	30,072	[2]
Accumulated Depreciation	10,398
Total Cost, Net of Accumulated Depreciation	19,674
Year of Acquisition or Completion	1998
Ridgeview At Wakefield Valley [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Ridgeview at Wakefield Valley
Encumbrances	18,035
Land	2,300
UPREIT Unit Alloc. Land	72	[1]
Initial Cost Buildings, Improvements & Equipment	17,247
UPREIT Unit Alloc. Bldg.	635	[1]
Costs Capitalized Subsequent to Acquisition	4,435
Land	2,372
Total Cost Buildings, Improvements & Equipment	22,317
Total	24,689	[2]
Accumulated Depreciation	4,876
Total Cost, Net of Accumulated Depreciation	19,813
Year of Acquisition or Completion	2005
Ridley Brook Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Ridley Brook Apartments
Encumbrances	12,988
Land	1,952
UPREIT Unit Alloc. Land	74	[1]
Initial Cost Buildings, Improvements & Equipment	7,719
UPREIT Unit Alloc. Bldg.	748	[1]
Costs Capitalized Subsequent to Acquisition	6,214
Land	2,026
Total Cost Buildings, Improvements & Equipment	14,681
Total	16,707	[2]
Accumulated Depreciation	5,001
Total Cost, Net of Accumulated Depreciation	11,706
Year of Acquisition or Completion	1999
Royal Gardens Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Royal Gardens Apartments
Encumbrances	47,000
Land	5,500
UPREIT Unit Alloc. Land	258	[1]
Initial Cost Buildings, Improvements & Equipment	14,067
UPREIT Unit Alloc. Bldg.	2,603	[1]
Costs Capitalized Subsequent to Acquisition	17,604
Land	5,758
Total Cost Buildings, Improvements & Equipment	34,274
Total	40,032	[2]
Accumulated Depreciation	14,649
Total Cost, Net of Accumulated Depreciation	25,383
Year of Acquisition or Completion	1997
Saddle Brooke Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Saddle Brooke Apartments
Encumbrances	29,790
Land	7,609
Initial Cost Buildings, Improvements & Equipment	44,040
Costs Capitalized Subsequent to Acquisition	6,600
Land	7,609
Total Cost Buildings, Improvements & Equipment	50,640
Total	58,249	[2]
Accumulated Depreciation	4,641
Total Cost, Net of Accumulated Depreciation	53,608
Year of Acquisition or Completion	2008
Sayville Commons [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Sayville Commons
Encumbrances	38,927
Land	8,005
UPREIT Unit Alloc. Land	187	[1]
Initial Cost Buildings, Improvements & Equipment	55,346
UPREIT Unit Alloc. Bldg.	1,599	[1]
Costs Capitalized Subsequent to Acquisition	1,682
Land	8,192
Total Cost Buildings, Improvements & Equipment	58,627
Total	66,819	[2]
Accumulated Depreciation	9,893
Total Cost, Net of Accumulated Depreciation	56,926
Year of Acquisition or Completion	2005
Selford Townhomes [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Selford Townhomes
Encumbrances	8,801
Land	1,224
UPREIT Unit Alloc. Land	57	[1]
Initial Cost Buildings, Improvements & Equipment	4,200
UPREIT Unit Alloc. Bldg.	565	[1]
Costs Capitalized Subsequent to Acquisition	3,122
Land	1,281
Total Cost Buildings, Improvements & Equipment	7,887
Total	9,168	[2]
Accumulated Depreciation	2,949
Total Cost, Net of Accumulated Depreciation	6,219
Year of Acquisition or Completion	1999
Seminary Hill Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Seminary Hill Apartments
Land	2,960
UPREIT Unit Alloc. Land	135	[1]
Initial Cost Buildings, Improvements & Equipment	10,194
UPREIT Unit Alloc. Bldg.	1,344	[1]
Costs Capitalized Subsequent to Acquisition	10,328
Land	3,095
Total Cost Buildings, Improvements & Equipment	21,866
Total	24,961	[2]
Accumulated Depreciation	8,278
Total Cost, Net of Accumulated Depreciation	16,683
Year of Acquisition or Completion	1999
Seminary Towers Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Seminary Towers Apartments
Encumbrances	53,515
Land	5,480
UPREIT Unit Alloc. Land	292	[1]
Initial Cost Buildings, Improvements & Equipment	19,348
UPREIT Unit Alloc. Bldg.	2,868	[1]
Costs Capitalized Subsequent to Acquisition	21,181
Land	5,772
Total Cost Buildings, Improvements & Equipment	43,397
Total	49,169	[2]
Accumulated Depreciation	15,811
Total Cost, Net of Accumulated Depreciation	33,358
Year of Acquisition or Completion	1999
Sherry Lake Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Sherry Lake Apartments
Encumbrances	25,508
Land	2,428
UPREIT Unit Alloc. Land	165	[1]
Initial Cost Buildings, Improvements & Equipment	15,620
UPREIT Unit Alloc. Bldg.	1,617	[1]
Costs Capitalized Subsequent to Acquisition	11,745
Land	2,593
Total Cost Buildings, Improvements & Equipment	28,982
Total	31,575	[2]
Accumulated Depreciation	10,865
Total Cost, Net of Accumulated Depreciation	20,710
Year of Acquisition or Completion	1998
Somerset Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Somerset Apartments
Land	7,253
Initial Cost Buildings, Improvements & Equipment	12,937
Costs Capitalized Subsequent to Acquisition	20
Land	7,253
Total Cost Buildings, Improvements & Equipment	12,957
Total	20,210	[2]
Accumulated Depreciation	86
Total Cost, Net of Accumulated Depreciation	20,124
Year of Acquisition or Completion	2011
South Bay Manor [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	South Bay Manor
Encumbrances	6,674
Land	1,098
UPREIT Unit Alloc. Land	45	[1]
Initial Cost Buildings, Improvements & Equipment	1,958
UPREIT Unit Alloc. Bldg.	440	[1]
Costs Capitalized Subsequent to Acquisition	5,186
Land	1,143
Total Cost Buildings, Improvements & Equipment	7,584
Total	8,727	[2]
Accumulated Depreciation	2,771
Total Cost, Net of Accumulated Depreciation	5,956
Year of Acquisition or Completion	2000
Southern Meadows [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Southern Meadows
Encumbrances	40,264
Land	9,040
UPREIT Unit Alloc. Land	343	[1]
Initial Cost Buildings, Improvements & Equipment	31,875
UPREIT Unit Alloc. Bldg.	3,397	[1]
Costs Capitalized Subsequent to Acquisition	10,832
Land	9,383
Total Cost Buildings, Improvements & Equipment	46,104
Total	55,487	[2]
Accumulated Depreciation	13,552
Total Cost, Net of Accumulated Depreciation	41,935
Year of Acquisition or Completion	2001
Stone Ends Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Stone Ends Apartments
Encumbrances	24,790
Land	5,600
UPREIT Unit Alloc. Land	166	[1]
Initial Cost Buildings, Improvements & Equipment	28,468
UPREIT Unit Alloc. Bldg.	1,554	[1]
Costs Capitalized Subsequent to Acquisition	5,216
Land	5,766
Total Cost Buildings, Improvements & Equipment	35,238
Total	41,004	[2]
Accumulated Depreciation	8,462
Total Cost, Net of Accumulated Depreciation	32,542
Year of Acquisition or Completion	2003
Tamarron Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Tamarron Apartments
Encumbrances	14,566
Land	1,320
UPREIT Unit Alloc. Land	92	[1]
Initial Cost Buildings, Improvements & Equipment	8,474
UPREIT Unit Alloc. Bldg.	896	[1]
Costs Capitalized Subsequent to Acquisition	3,609
Land	1,412
Total Cost Buildings, Improvements & Equipment	12,979
Total	14,391	[2]
Accumulated Depreciation	4,247
Total Cost, Net of Accumulated Depreciation	10,144
Year of Acquisition or Completion	1999
The Apts At Cambridge Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Apts at Cambridge Court
Land	7,378
Initial Cost Buildings, Improvements & Equipment	82,641
Costs Capitalized Subsequent to Acquisition	327
Land	7,378
Total Cost Buildings, Improvements & Equipment	82,968
Total	90,346	[2]
Accumulated Depreciation	911
Total Cost, Net of Accumulated Depreciation	89,435
Year of Acquisition or Completion	2011
The Apts At Wellington Trace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Apts at Wellington Trace
Encumbrances	23,445
Land	3,060
UPREIT Unit Alloc. Land	167	[1]
Initial Cost Buildings, Improvements & Equipment	26,305
UPREIT Unit Alloc. Bldg.	1,418	[1]
Costs Capitalized Subsequent to Acquisition	840
Land	3,227
Total Cost Buildings, Improvements & Equipment	28,563
Total	31,790	[2]
Accumulated Depreciation	5,930
Total Cost, Net of Accumulated Depreciation	25,860
Year of Acquisition or Completion	2004
The Brooke At Peachtree [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Brooke at Peachtree
Encumbrances	12,171
Land	992
UPREIT Unit Alloc. Land	51	[1]
Initial Cost Buildings, Improvements & Equipment	15,137
UPREIT Unit Alloc. Bldg.	437	[1]
Costs Capitalized Subsequent to Acquisition	4,045
Land	1,043
Total Cost Buildings, Improvements & Equipment	19,619
Total	20,662	[2]
Accumulated Depreciation	3,536
Total Cost, Net of Accumulated Depreciation	17,126
Year of Acquisition or Completion	2005
The Colony [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Colony
Land	7,830
UPREIT Unit Alloc. Land	197	[1]
Initial Cost Buildings, Improvements & Equipment	34,121
UPREIT Unit Alloc. Bldg.	2,025	[1]
Costs Capitalized Subsequent to Acquisition	14,638
Land	8,027
Total Cost Buildings, Improvements & Equipment	50,784
Total	58,811	[2]
Accumulated Depreciation	17,773
Total Cost, Net of Accumulated Depreciation	41,038
Year of Acquisition or Completion	1999
The Commons At Haynes Farm [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Commons at Haynes Farm
Land	7,550
Initial Cost Buildings, Improvements & Equipment	32,771
Costs Capitalized Subsequent to Acquisition	1,383
Land	7,550
Total Cost Buildings, Improvements & Equipment	34,154
Total	41,704	[2]
Accumulated Depreciation	464
Total Cost, Net of Accumulated Depreciation	41,240
Year of Acquisition or Completion	2011
The Courts At Dulles [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Courts at Dulles
Land	15,413
Initial Cost Buildings, Improvements & Equipment	76,947
Costs Capitalized Subsequent to Acquisition	23
Land	15,413
Total Cost Buildings, Improvements & Equipment	76,970
Total	92,383	[2]
Accumulated Depreciation	333
Total Cost, Net of Accumulated Depreciation	92,050
Year of Acquisition or Completion	2011
The Courts At Fair Oaks [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Courts at Fair Oaks
Encumbrances	49,126
Land	12,377
Initial Cost Buildings, Improvements & Equipment	61,107
Costs Capitalized Subsequent to Acquisition	1,244
Land	12,377
Total Cost Buildings, Improvements & Equipment	62,351
Total	74,728	[2]
Accumulated Depreciation	2,203
Total Cost, Net of Accumulated Depreciation	72,525
Year of Acquisition or Completion	2010
The Coves At Chesapeake [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Coves at Chesapeake
Land	8,915
Initial Cost Buildings, Improvements & Equipment	57,974
Costs Capitalized Subsequent to Acquisition	9,021
Land	8,915
Total Cost Buildings, Improvements & Equipment	66,995
Total	75,910	[2]
Accumulated Depreciation	10,090
Total Cost, Net of Accumulated Depreciation	65,820
Year of Acquisition or Completion	2006
The Gates Of Deer Grove [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Gates of Deer Grove
Land	1,247
Initial Cost Buildings, Improvements & Equipment	18,973
Costs Capitalized Subsequent to Acquisition	5
Land	1,247
Total Cost Buildings, Improvements & Equipment	18,978
Total	20,225	[2]
Accumulated Depreciation	43
Total Cost, Net of Accumulated Depreciation	20,182
Year of Acquisition or Completion	2011
The Greens At Columbia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Greens at Columbia
Encumbrances	9,558
Land	5,040
Initial Cost Buildings, Improvements & Equipment	20,886
Costs Capitalized Subsequent to Acquisition	1,117
Land	5,040
Total Cost Buildings, Improvements & Equipment	22,003
Total	27,043	[2]
Accumulated Depreciation	899
Total Cost, Net of Accumulated Depreciation	26,144
Year of Acquisition or Completion	2010
The Hamptons [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Hamptons
Encumbrances	49,918
Land	5,749
UPREIT Unit Alloc. Land	303	[1]
Initial Cost Buildings, Improvements & Equipment	50,489
UPREIT Unit Alloc. Bldg.	2,599	[1]
Costs Capitalized Subsequent to Acquisition	12,844
Land	6,052
Total Cost Buildings, Improvements & Equipment	65,932
Total	71,984	[2]
Accumulated Depreciation	14,708
Total Cost, Net of Accumulated Depreciation	57,276
Year of Acquisition or Completion	2004
The Heights At Marlborough [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Heights at Marlborough
Encumbrances	23,135
Land	6,253
Initial Cost Buildings, Improvements & Equipment	44,268
Costs Capitalized Subsequent to Acquisition	6,684
Land	6,253
Total Cost Buildings, Improvements & Equipment	50,952
Total	57,205	[2]
Accumulated Depreciation	7,421
Total Cost, Net of Accumulated Depreciation	49,784
Year of Acquisition or Completion	2006
The Landings [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Landings
Encumbrances	25,859
Land	2,459
UPREIT Unit Alloc. Land	162	[1]
Initial Cost Buildings, Improvements & Equipment	16,753
UPREIT Unit Alloc. Bldg.	1,595	[1]
Costs Capitalized Subsequent to Acquisition	12,667
Land	2,621
Total Cost Buildings, Improvements & Equipment	31,015
Total	33,636	[2]
Accumulated Depreciation	12,264
Total Cost, Net of Accumulated Depreciation	21,372
Year of Acquisition or Completion	1996
The Manor Apartments (MD) [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Manor Apartments (MD)
Encumbrances	45,871
Land	8,700
UPREIT Unit Alloc. Land	257	[1]
Initial Cost Buildings, Improvements & Equipment	27,703
UPREIT Unit Alloc. Bldg.	2,513	[1]
Costs Capitalized Subsequent to Acquisition	11,951
Land	8,957
Total Cost Buildings, Improvements & Equipment	42,167
Total	51,124	[2]
Accumulated Depreciation	12,958
Total Cost, Net of Accumulated Depreciation	38,166
Year of Acquisition or Completion	2001
The Manor Apartments (VA) [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Manor Apartments (VA)
Encumbrances	13,671
Land	1,386
UPREIT Unit Alloc. Land	85	[1]
Initial Cost Buildings, Improvements & Equipment	5,738
UPREIT Unit Alloc. Bldg.	832	[1]
Costs Capitalized Subsequent to Acquisition	5,832
Land	1,471
Total Cost Buildings, Improvements & Equipment	12,402
Total	13,873	[2]
Accumulated Depreciation	5,078
Total Cost, Net of Accumulated Depreciation	8,795
Year of Acquisition or Completion	1999
The Meadows At Marlborough [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Meadows at Marlborough
Encumbrances	20,922
Land	6,598
Initial Cost Buildings, Improvements & Equipment	28,736
Costs Capitalized Subsequent to Acquisition	4,590
Land	6,598
Total Cost Buildings, Improvements & Equipment	33,326
Total	39,924	[2]
Accumulated Depreciation	4,954
Total Cost, Net of Accumulated Depreciation	34,970
Year of Acquisition or Completion	2006
The New Colonies [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The New Colonies
Encumbrances	17,452
Land	1,680
UPREIT Unit Alloc. Land	151	[1]
Initial Cost Buildings, Improvements & Equipment	21,350
UPREIT Unit Alloc. Bldg.	1,545	[1]
Costs Capitalized Subsequent to Acquisition	13,256
Land	1,831
Total Cost Buildings, Improvements & Equipment	36,151
Total	37,982	[2]
Accumulated Depreciation	15,176
Total Cost, Net of Accumulated Depreciation	22,806
Year of Acquisition or Completion	1998
The Sycamores [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Sycamores
Encumbrances	21,025
Land	4,625
UPREIT Unit Alloc. Land	136	[1]
Initial Cost Buildings, Improvements & Equipment	15,737
UPREIT Unit Alloc. Bldg.	1,283	[1]
Costs Capitalized Subsequent to Acquisition	3,233
Land	4,761
Total Cost Buildings, Improvements & Equipment	20,253
Total	25,014	[2]
Accumulated Depreciation	5,277
Total Cost, Net of Accumulated Depreciation	19,737
Year of Acquisition or Completion	2002
The Townhomes Of Beverly [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Townhomes of Beverly
Land	5,820
Initial Cost Buildings, Improvements & Equipment	30,465
Costs Capitalized Subsequent to Acquisition	5,031
Land	5,820
Total Cost Buildings, Improvements & Equipment	35,496
Total	41,316	[2]
Accumulated Depreciation	5,000
Total Cost, Net of Accumulated Depreciation	36,316
Year of Acquisition or Completion	2007
The Village At Marshfield [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	The Village at Marshfield
Land	3,158
UPREIT Unit Alloc. Land	134	[1]
Initial Cost Buildings, Improvements & Equipment	28,354
UPREIT Unit Alloc. Bldg.	1,158	[1]
Costs Capitalized Subsequent to Acquisition	6,643
Land	3,292
Total Cost Buildings, Improvements & Equipment	36,155
Total	39,447	[2]
Accumulated Depreciation	7,400
Total Cost, Net of Accumulated Depreciation	32,047
Year of Acquisition or Completion	2004
Timbercroft Townhomes & Apts. [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Timbercroft Townhomes & Apts.
Encumbrances	3,406
Land	1,704
UPREIT Unit Alloc. Land	87	[1]
Initial Cost Buildings, Improvements & Equipment	6,826
UPREIT Unit Alloc. Bldg.	842	[1]
Costs Capitalized Subsequent to Acquisition	6,546
Land	1,791
Total Cost Buildings, Improvements & Equipment	14,214
Total	16,005	[2]
Accumulated Depreciation	5,048
Total Cost, Net of Accumulated Depreciation	10,957
Year of Acquisition or Completion	1999
Top Field Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Top Field Apartments
Encumbrances	16,403
Land	1,635
Initial Cost Buildings, Improvements & Equipment	16,684
Costs Capitalized Subsequent to Acquisition	4,132
Land	1,635
Total Cost Buildings, Improvements & Equipment	20,816
Total	22,451	[2]
Accumulated Depreciation	3,211
Total Cost, Net of Accumulated Depreciation	19,240
Year of Acquisition or Completion	2006
Trexler Park Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Trexler Park Apartments
Encumbrances	38,068
Land	2,490
UPREIT Unit Alloc. Land	114	[1]
Initial Cost Buildings, Improvements & Equipment	13,841
UPREIT Unit Alloc. Bldg.	1,129	[1]
Costs Capitalized Subsequent to Acquisition	8,525
Land	2,604
Total Cost Buildings, Improvements & Equipment	23,495
Total	26,099	[2]
Accumulated Depreciation	8,035
Total Cost, Net of Accumulated Depreciation	18,064
Year of Acquisition or Completion	2000
Trexler Park West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Trexler Park West
Land	2,684
Costs Capitalized Subsequent to Acquisition	23,325
Land	2,684
Total Cost Buildings, Improvements & Equipment	23,325
Total	26,009	[2]
Accumulated Depreciation	6,430
Total Cost, Net of Accumulated Depreciation	19,579
Year of Acquisition or Completion	2006	[3]
Village At Potomac Falls [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Village at Potomac Falls
Land	7,380
Initial Cost Buildings, Improvements & Equipment	30,960
Costs Capitalized Subsequent to Acquisition	1,005
Land	7,380
Total Cost Buildings, Improvements & Equipment	31,965
Total	39,345	[2]
Accumulated Depreciation	1,226
Total Cost, Net of Accumulated Depreciation	38,119
Year of Acquisition or Completion	2010
Village Square Townhomes & Apts. [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Village Square Townhomes & Apts.
Encumbrances	39,285
Land	2,590
UPREIT Unit Alloc. Land	191	[1]
Initial Cost Buildings, Improvements & Equipment	13,306
UPREIT Unit Alloc. Bldg.	1,900	[1]
Costs Capitalized Subsequent to Acquisition	9,847
Land	2,781
Total Cost Buildings, Improvements & Equipment	25,053
Total	27,834	[2]
Accumulated Depreciation	8,691
Total Cost, Net of Accumulated Depreciation	19,143
Year of Acquisition or Completion	1999
Vinings At Hampton Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Vinings at Hampton Village
Land	1,772
UPREIT Unit Alloc. Land	77	[1]
Initial Cost Buildings, Improvements & Equipment	12,148
UPREIT Unit Alloc. Bldg.	657	[1]
Costs Capitalized Subsequent to Acquisition	3,967
Land	1,849
Total Cost Buildings, Improvements & Equipment	16,772
Total	18,621	[2]
Accumulated Depreciation	3,853
Total Cost, Net of Accumulated Depreciation	14,768
Year of Acquisition or Completion	2004
Virginia Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Virginia Village
Encumbrances	29,102
Land	5,160
UPREIT Unit Alloc. Land	207	[1]
Initial Cost Buildings, Improvements & Equipment	21,918
UPREIT Unit Alloc. Bldg.	2,027	[1]
Costs Capitalized Subsequent to Acquisition	14,156
Land	5,367
Total Cost Buildings, Improvements & Equipment	38,101
Total	43,468	[2]
Accumulated Depreciation	11,429
Total Cost, Net of Accumulated Depreciation	32,039
Year of Acquisition or Completion	2001
Waterview Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Waterview Apartments
Land	1,531
Initial Cost Buildings, Improvements & Equipment	23,030
Costs Capitalized Subsequent to Acquisition	955
Land	1,531
Total Cost Buildings, Improvements & Equipment	23,985
Total	25,516	[2]
Accumulated Depreciation	321
Total Cost, Net of Accumulated Depreciation	25,195
Year of Acquisition or Completion	2011
Wayne Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Wayne Village
Encumbrances	25,603
Land	1,925
UPREIT Unit Alloc. Land	177	[1]
Initial Cost Buildings, Improvements & Equipment	12,895
UPREIT Unit Alloc. Bldg.	1,744	[1]
Costs Capitalized Subsequent to Acquisition	8,971
Land	2,102
Total Cost Buildings, Improvements & Equipment	23,610
Total	25,712	[2]
Accumulated Depreciation	9,173
Total Cost, Net of Accumulated Depreciation	16,539
Year of Acquisition or Completion	1998
West Springfield Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	West Springfield Terrace
Encumbrances	20,834
Land	2,440
UPREIT Unit Alloc. Land	194	[1]
Initial Cost Buildings, Improvements & Equipment	31,766
UPREIT Unit Alloc. Bldg.	1,845	[1]
Costs Capitalized Subsequent to Acquisition	3,992
Land	2,634
Total Cost Buildings, Improvements & Equipment	37,603
Total	40,237	[2]
Accumulated Depreciation	9,308
Total Cost, Net of Accumulated Depreciation	30,929
Year of Acquisition or Completion	2002
Westbrooke Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Westbrooke Apartments
Land	1,103
Initial Cost Buildings, Improvements & Equipment	5,229
Costs Capitalized Subsequent to Acquisition	1,078
Land	1,103
Total Cost Buildings, Improvements & Equipment	6,307
Total	7,410	[2]
Accumulated Depreciation	358
Total Cost, Net of Accumulated Depreciation	7,052
Year of Acquisition or Completion	2010
Westchester West Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Westchester West Apartments
Encumbrances	33,841
Land	6,978
Initial Cost Buildings, Improvements & Equipment	41,513
Costs Capitalized Subsequent to Acquisition	3,767
Land	6,978
Total Cost Buildings, Improvements & Equipment	45,280
Total	52,258	[2]
Accumulated Depreciation	4,018
Total Cost, Net of Accumulated Depreciation	48,240
Year of Acquisition or Completion	2008
Westwood Village Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Westwood Village Apartments
Encumbrances	46,067
Land	7,260
UPREIT Unit Alloc. Land	270	[1]
Initial Cost Buildings, Improvements & Equipment	22,757
UPREIT Unit Alloc. Bldg.	2,629	[1]
Costs Capitalized Subsequent to Acquisition	12,318
Land	7,530
Total Cost Buildings, Improvements & Equipment	37,704
Total	45,234	[2]
Accumulated Depreciation	10,994
Total Cost, Net of Accumulated Depreciation	34,240
Year of Acquisition or Completion	2002
Westwoods [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Westwoods
Encumbrances	3,470
Land	1,260
Initial Cost Buildings, Improvements & Equipment	2,694
Costs Capitalized Subsequent to Acquisition	570
Land	1,260
Total Cost Buildings, Improvements & Equipment	3,264
Total	4,524	[2]
Accumulated Depreciation	477
Total Cost, Net of Accumulated Depreciation	4,047
Year of Acquisition or Completion	2007
William Henry Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	William Henry Apartments
Encumbrances	28,268
Land	4,666
UPREIT Unit Alloc. Land	187	[1]
Initial Cost Buildings, Improvements & Equipment	22,277
UPREIT Unit Alloc. Bldg.	1,839	[1]
Costs Capitalized Subsequent to Acquisition	16,226
Land	4,853
Total Cost Buildings, Improvements & Equipment	40,342
Total	45,195	[2]
Accumulated Depreciation	12,876
Total Cost, Net of Accumulated Depreciation	32,319
Year of Acquisition or Completion	2000
Windsor Realty Company [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Windsor Realty Company
Land	402
UPREIT Unit Alloc. Land	34	[1]
Initial Cost Buildings, Improvements & Equipment	3,300
UPREIT Unit Alloc. Bldg.	337	[1]
Costs Capitalized Subsequent to Acquisition	2,427
Land	436
Total Cost Buildings, Improvements & Equipment	6,064
Total	6,500	[2]
Accumulated Depreciation	2,473
Total Cost, Net of Accumulated Depreciation	4,027
Year of Acquisition or Completion	1998
Woodholme Manor Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Woodholme Manor Apartments
Encumbrances	3,366
Land	1,232
UPREIT Unit Alloc. Land	59	[1]
Initial Cost Buildings, Improvements & Equipment	4,599
UPREIT Unit Alloc. Bldg.	576	[1]
Costs Capitalized Subsequent to Acquisition	5,515
Land	1,291
Total Cost Buildings, Improvements & Equipment	10,690
Total	11,981	[2]
Accumulated Depreciation	3,865
Total Cost, Net of Accumulated Depreciation	8,116
Year of Acquisition or Completion	2001
Woodleaf Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Woodleaf Apartments
Land	2,862
UPREIT Unit Alloc. Land	122	[1]
Initial Cost Buildings, Improvements & Equipment	17,720
UPREIT Unit Alloc. Bldg.	1,028	[1]
Costs Capitalized Subsequent to Acquisition	3,160
Land	2,984
Total Cost Buildings, Improvements & Equipment	21,908
Total	24,892	[2]
Accumulated Depreciation	5,044
Total Cost, Net of Accumulated Depreciation	19,848
Year of Acquisition or Completion	2004
Woodmont Village Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Woodmont Village Apartments
Encumbrances	9,864
Land	2,880
UPREIT Unit Alloc. Land	63	[1]
Initial Cost Buildings, Improvements & Equipment	5,699
UPREIT Unit Alloc. Bldg.	622	[1]
Costs Capitalized Subsequent to Acquisition	3,057
Land	2,943
Total Cost Buildings, Improvements & Equipment	9,378
Total	12,321	[2]
Accumulated Depreciation	2,744
Total Cost, Net of Accumulated Depreciation	9,577
Year of Acquisition or Completion	2002
Yorkshire Village Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Yorkshire Village Apartments
Land	1,196
UPREIT Unit Alloc. Land	27	[1]
Initial Cost Buildings, Improvements & Equipment	2,016
UPREIT Unit Alloc. Bldg.	260	[1]
Costs Capitalized Subsequent to Acquisition	1,416
Land	1,223
Total Cost Buildings, Improvements & Equipment	3,692
Total	4,915	[2]
Accumulated Depreciation	1,089
Total Cost, Net of Accumulated Depreciation	3,826
Year of Acquisition or Completion	2002
Other Assets [Member]
Real Estate and Accumulated Depreciation [Line Items]
Community	Other Assets (d)	[4]
Encumbrances	84	[4]
Initial Cost Buildings, Improvements & Equipment	2	[4]
Costs Capitalized Subsequent to Acquisition	99,150	[4]
Total Cost Buildings, Improvements & Equipment	99,152	[4]
Total	99,152	[2],[4]
Accumulated Depreciation	21,194	[4]
Total Cost, Net of Accumulated Depreciation	$ 77,958	[4]
Year of Acquisition or Completion	Various	[4]

[1] In 2008 and prior periods, authoritative guidance required the exchange of noncontrolling interests (UPREIT Units) for shares to be recorded under the purchase method with the difference between the fair value and book value of an exchanged UPREIT Unit allocated to real estate assets.

[2] The aggregate cost for federal income tax purposes was approximately $4,621,394.

[3] Property was constructed by the Company and completed in the year indicated.

[4] Includes construction in progress of $64,201, assets of one development community placed into service of $5,887 and corporate office assets of $29,064.