Schedule III Real Estate and Accumulated Depreciation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Real Estate and Accumulated Depreciation [Line Items]
Property	Santa Clara Square
Rentable Square Footage	139,000
Location	Santa Clara, CA
Encumbrance	$ 10,388
Initial cost [Abstract]
Land	6,472
Buildings and improvements	11,704
Costs capitalized subsequent to acquisition	1,670
Gross amount carried at close of period [Abstract]
Land and improvements	6,472
Buildings and improvements	13,374
Total	19,846	[1]
Accumulated depreciation	734
Date of construction	1970
Date acquired	09/11
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at beginning of year	3,964,561		3,310,152	3,177,010
Improvements	68,338		51,101	79,094
Acquisition of real estate	103,300		387,300	16,000
Development of real estate	195,634		216,008	74,590
Disposition of real estate	(18,769)		0	(36,542)
Balance at the end of year	4,313,064		3,964,561	3,310,152
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at beginning of year	775,553		646,686	537,248
Depreciation expense - Acquisitions	1,279		2,505	18
Depreciation expense - Discontinued operations	315		0	495
Depreciation and amortization expense - Rental properties	148,337		126,362	116,762
Dispositions	(5,458)		0	(7,837)
Balance at the end of year	920,026		775,553	646,686
Subtotal 4 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	27,231
Encumbrance	1,729,822
Initial cost [Abstract]
Land	835,218
Buildings and improvements	2,670,710
Costs capitalized subsequent to acquisition	727,468
Gross amount carried at close of period [Abstract]
Land and improvements	837,738
Buildings and improvements	3,395,662
Total	4,233,399	[1]
Accumulated depreciation	904,125
Lives , maximum (in years)	30
Subtotal 5 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance	1,745,858
Initial cost [Abstract]
Land	881,509
Buildings and improvements	2,711,701
Costs capitalized subsequent to acquisition	764,137
Gross amount carried at close of period [Abstract]
Land and improvements	904,947
Buildings and improvements	3,452,403
Total	4,357,351	[1]
Accumulated depreciation	920,026
Encumbered Apartment Communities [Member] | Subtotal 1 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance	250,000
Initial cost [Abstract]
Land	64,781
Buildings and improvements	204,147
Costs capitalized subsequent to acquisition	39,197
Gross amount carried at close of period [Abstract]
Land and improvements	66,048
Buildings and improvements	242,077
Total	308,125	[1]
Accumulated depreciation	93,153
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | Subtotal 2 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance	207,215
Initial cost [Abstract]
Land	32,538
Buildings and improvements	117,954
Costs capitalized subsequent to acquisition	46,827
Gross amount carried at close of period [Abstract]
Land and improvements	36,297
Buildings and improvements	161,023
Total	197,319	[1]
Accumulated depreciation	60,243
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | Subtotal 3 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrance	1,729,822
Initial cost [Abstract]
Land	442,136
Buildings and improvements	1,391,045
Costs capitalized subsequent to acquisition	398,437
Gross amount carried at close of period [Abstract]
Land and improvements	459,768
Buildings and improvements	1,771,849
Total	2,231,617	[1]
Accumulated depreciation	557,187
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Bonita [Member] | Bonita Cedars [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Bonita Cedars
Units	120
Location	Bonita, CA
Initial cost [Abstract]
Land	2,496
Buildings and improvements	9,913
Costs capitalized subsequent to acquisition	1,419
Gross amount carried at close of period [Abstract]
Land and improvements	2,503
Buildings and improvements	11,324
Total	13,828	[1]
Accumulated depreciation	3,643
Date of construction	1983
Date acquired	12/02
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Sunnyvale [Member] | Bristol Commons [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Bristol Commons
Units	188
Location	Sunnyvale, CA
Initial cost [Abstract]
Land	5,278
Buildings and improvements	11,853
Costs capitalized subsequent to acquisition	1,537
Gross amount carried at close of period [Abstract]
Land and improvements	5,293
Buildings and improvements	13,375
Total	18,668	[1]
Accumulated depreciation	6,789
Date of construction	1989
Date acquired	01/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Sunnyvale [Member] | Windsor Ridge [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Windsor Ridge
Units	216
Location	Sunnyvale, CA
Initial cost [Abstract]
Land	4,017
Buildings and improvements	10,315
Costs capitalized subsequent to acquisition	4,342
Gross amount carried at close of period [Abstract]
Land and improvements	4,021
Buildings and improvements	14,653
Total	18,674	[1]
Accumulated depreciation	10,382
Date of construction	1989
Date acquired	03/89
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Sunnyvale [Member] | Brookside Oaks [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Brookside Oaks
Units	170
Location	Sunnyvale, CA
Encumbrance	20,277
Initial cost [Abstract]
Land	7,301
Buildings and improvements	16,310
Costs capitalized subsequent to acquisition	19,168
Gross amount carried at close of period [Abstract]
Land and improvements	10,328
Buildings and improvements	32,451
Total	42,779	[1]
Accumulated depreciation	9,673
Date of construction	1973
Date acquired	06/00
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Sunnyvale [Member] | Montclaire, The [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Montclaire, The
Units	390
Location	Sunnyvale, CA
Encumbrance	47,934
Initial cost [Abstract]
Land	4,842
Buildings and improvements	19,776
Costs capitalized subsequent to acquisition	19,287
Gross amount carried at close of period [Abstract]
Land and improvements	4,997
Buildings and improvements	38,908
Total	43,905	[1]
Accumulated depreciation	24,654
Date of construction	1973
Date acquired	12/88
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Sunnyvale [Member] | Summerhill Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Summerhill Park
Units	100
Location	Sunnyvale, CA
Encumbrance	13,971
Initial cost [Abstract]
Land	2,654
Buildings and improvements	4,918
Costs capitalized subsequent to acquisition	956
Gross amount carried at close of period [Abstract]
Land and improvements	2,656
Buildings and improvements	5,872
Total	8,528	[1]
Accumulated depreciation	4,253
Date of construction	1988
Date acquired	09/88
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Sunnyvale [Member] | Thomas Jefferson [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Thomas Jefferson
Units	156
Location	Sunnyvale, CA
Encumbrance	18,589
Initial cost [Abstract]
Land	8,190
Buildings and improvements	19,306
Costs capitalized subsequent to acquisition	8,465
Gross amount carried at close of period [Abstract]
Land and improvements	8,191
Buildings and improvements	27,770
Total	35,961	[1]
Accumulated depreciation	3,427
Date of construction	1969
Date acquired	09/07
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Los Angeles [Member] | Bunker Hill [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Bunker Hill
Units	456
Location	Los Angeles, CA
Initial cost [Abstract]
Land	11,498
Buildings and improvements	27,871
Costs capitalized subsequent to acquisition	3,632
Gross amount carried at close of period [Abstract]
Land and improvements	11,639
Buildings and improvements	31,362
Total	43,001	[1]
Accumulated depreciation	14,263
Date of construction	1968
Date acquired	03/98
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Los Angeles [Member] | Belmont Station [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Belmont Station
Units	275
Location	Los Angeles, CA
Encumbrance	30,045
Initial cost [Abstract]
Land	8,100
Buildings and improvements	66,666
Costs capitalized subsequent to acquisition	2,645
Gross amount carried at close of period [Abstract]
Land and improvements	8,267
Buildings and improvements	69,144
Total	77,411	[1]
Accumulated depreciation	10,007
Date of construction	2008
Date acquired	12/08
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Los Angeles [Member] | Kings Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Kings Road
Units	196
Location	Los Angeles, CA
Encumbrance	29,863
Initial cost [Abstract]
Land	4,023
Buildings and improvements	9,527
Costs capitalized subsequent to acquisition	7,148
Gross amount carried at close of period [Abstract]
Land and improvements	4,031
Buildings and improvements	16,667
Total	20,698	[1]
Accumulated depreciation	6,856
Date of construction	1979
Date acquired	06/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Los Angeles [Member] | Miracle Mile (Park Place/Windsor Cout/Cochran) [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Miracle Mile (Park Place/Windsor Cout/Cochran)
Units	176
Location	Los Angeles, CA
Encumbrance	20,299
Initial cost [Abstract]
Land	4,965
Buildings and improvements	11,806
Costs capitalized subsequent to acquisition	7,613
Gross amount carried at close of period [Abstract]
Land and improvements	5,015
Buildings and improvements	19,369
Total	24,384	[1]
Accumulated depreciation	9,093
Date of construction	1988
Date acquired	08/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Simi Valley [Member] | Meadowood [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Meadowood
Units	320
Location	Simi Valley, CA
Initial cost [Abstract]
Land	7,852
Buildings and improvements	18,592
Costs capitalized subsequent to acquisition	4,380
Gross amount carried at close of period [Abstract]
Land and improvements	7,898
Buildings and improvements	22,926
Total	30,824	[1]
Accumulated depreciation	11,000
Date of construction	1986
Date acquired	11/96
Lives, minimum (in years)	3
Encumbered Apartment Communities [Member] | CA [Member] | Simi Valley [Member] | Hidden Valley [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Hidden Valley
Units	324
Location	Simi Valley, CA
Encumbrance	31,180
Initial cost [Abstract]
Land	14,174
Buildings and improvements	34,065
Costs capitalized subsequent to acquisition	1,155
Gross amount carried at close of period [Abstract]
Land and improvements	11,663
Buildings and improvements	37,731
Total	49,394	[1]
Accumulated depreciation	9,383
Date of construction	2004
Date acquired	12/04
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Mira Mesa [Member] | Mira Monte [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Mira Monte
Units	355
Location	Mira Mesa, CA
Initial cost [Abstract]
Land	7,165
Buildings and improvements	28,459
Costs capitalized subsequent to acquisition	7,336
Gross amount carried at close of period [Abstract]
Land and improvements	7,186
Buildings and improvements	35,774
Total	42,960	[1]
Accumulated depreciation	12,507
Date of construction	1982
Date acquired	12/02
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Oceanside [Member] | Mission Hills [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Mission Hills
Units	282
Location	Oceanside, CA
Initial cost [Abstract]
Land	10,099
Buildings and improvements	38,778
Costs capitalized subsequent to acquisition	3,554
Gross amount carried at close of period [Abstract]
Land and improvements	10,167
Buildings and improvements	42,264
Total	52,431	[1]
Accumulated depreciation	10,092
Date of construction	1984
Date acquired	07/05
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Lake Forest [Member] | Trabucco Villas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Trabucco Villas
Units	132
Location	Lake Forest, CA
Initial cost [Abstract]
Land	3,638
Buildings and improvements	8,640
Costs capitalized subsequent to acquisition	1,469
Gross amount carried at close of period [Abstract]
Land and improvements	3,890
Buildings and improvements	9,857
Total	13,747	[1]
Accumulated depreciation	4,462
Date of construction	1985
Date acquired	10/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Walnut [Member] | Walnut Heights [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Walnut Heights
Units	163
Location	Walnut, CA
Initial cost [Abstract]
Land	4,858
Buildings and improvements	19,168
Costs capitalized subsequent to acquisition	1,883
Gross amount carried at close of period [Abstract]
Land and improvements	4,887
Buildings and improvements	21,022
Total	25,909	[1]
Accumulated depreciation	5,929
Date of construction	1964
Date acquired	10/03
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | San Jose [Member] | Carlyle, The [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Carlyle, The
Units	132
Location	San Jose, CA
Encumbrance	18,936
Initial cost [Abstract]
Land	3,954
Buildings and improvements	15,277
Costs capitalized subsequent to acquisition	9,718
Gross amount carried at close of period [Abstract]
Land and improvements	5,801
Buildings and improvements	23,148
Total	28,949	[1]
Accumulated depreciation	8,372
Date of construction	2000
Date acquired	04/00
Lives, minimum (in years)	3
Encumbered Apartment Communities [Member] | CA [Member] | San Jose [Member] | Bella Villagio [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Bella Villagio
Units	231
Location	San Jose, CA
Encumbrance	38,834
Initial cost [Abstract]
Land	17,247
Buildings and improvements	40,343
Costs capitalized subsequent to acquisition	1,295
Gross amount carried at close of period [Abstract]
Land and improvements	17,247
Buildings and improvements	41,638
Total	58,885	[1]
Accumulated depreciation	1,802
Date of construction	2004
Date acquired	09/10
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | San Jose [Member] | Esplanade [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Esplanade
Units	278
Location	San Jose, CA
Encumbrance	45,836
Initial cost [Abstract]
Land	18,170
Buildings and improvements	40,086
Costs capitalized subsequent to acquisition	5,065
Gross amount carried at close of period [Abstract]
Land and improvements	18,429
Buildings and improvements	44,892
Total	63,321	[1]
Accumulated depreciation	11,393
Date of construction	2002
Date acquired	11/04
Lives, minimum (in years)	3
Encumbered Apartment Communities [Member] | CA [Member] | San Jose [Member] | 101 San Fernando [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	101 San Fernando
Units	323
Location	San Jose, CA
Encumbrance	35,261
Initial cost [Abstract]
Land	4,173
Buildings and improvements	58,961
Costs capitalized subsequent to acquisition	2,332
Gross amount carried at close of period [Abstract]
Land and improvements	4,173
Buildings and improvements	61,293
Total	65,466	[1]
Accumulated depreciation	3,059
Date of construction	2001
Date acquired	07/10
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Hayward [Member] | City View [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	City View
Units	560
Location	Hayward, CA
Encumbrance	64,254
Initial cost [Abstract]
Land	9,883
Buildings and improvements	37,670
Costs capitalized subsequent to acquisition	20,103
Gross amount carried at close of period [Abstract]
Land and improvements	10,350
Buildings and improvements	57,306
Total	67,656	[1]
Accumulated depreciation	25,819
Date of construction	1975
Date acquired	03/98
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | La Habra [Member] | Hillsborough Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Hillsborough Park
Units	235
Location	La Habra, CA
Encumbrance	38,566
Initial cost [Abstract]
Land	6,291
Buildings and improvements	15,455
Costs capitalized subsequent to acquisition	1,029
Gross amount carried at close of period [Abstract]
Land and improvements	6,272
Buildings and improvements	16,503
Total	22,775	[1]
Accumulated depreciation	6,820
Date of construction	1999
Date acquired	09/99
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Garden Grove [Member] | Montejo [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Montejo
Units	124
Location	Garden Grove, CA
Encumbrance	13,538
Initial cost [Abstract]
Land	1,925
Buildings and improvements	7,685
Costs capitalized subsequent to acquisition	2,030
Gross amount carried at close of period [Abstract]
Land and improvements	2,194
Buildings and improvements	9,445
Total	11,640	[1]
Accumulated depreciation	3,351
Date of construction	1974
Date acquired	11/01
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Santa Ana [Member] | Treehouse [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Treehouse
Units	164
Location	Santa Ana, CA
Encumbrance	17,568
Initial cost [Abstract]
Land	2,626
Buildings and improvements	10,485
Costs capitalized subsequent to acquisition	3,863
Gross amount carried at close of period [Abstract]
Land and improvements	2,957
Buildings and improvements	14,017
Total	16,974	[1]
Accumulated depreciation	4,371
Date of construction	1970
Date acquired	11/01
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Santa Ana [Member] | Brentwood [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Brentwood
Units	140
Location	Santa Ana, CA
Encumbrance	19,603
Initial cost [Abstract]
Land	2,833
Buildings and improvements	11,303
Costs capitalized subsequent to acquisition	5,282
Gross amount carried at close of period [Abstract]
Land and improvements	3,502
Buildings and improvements	15,916
Total	19,418	[1]
Accumulated depreciation	5,049
Date of construction	1970
Date acquired	11/01
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Fountain Valley [Member] | Valley Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Valley Park
Units	160
Location	Fountain Valley, CA
Encumbrance	22,983
Initial cost [Abstract]
Land	3,361
Buildings and improvements	13,420
Costs capitalized subsequent to acquisition	3,123
Gross amount carried at close of period [Abstract]
Land and improvements	3,761
Buildings and improvements	16,143
Total	19,904	[1]
Accumulated depreciation	5,481
Date of construction	1969
Date acquired	11/01
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Placentia [Member] | Villa Angelina [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Villa Angelina
Units	256
Location	Placentia, CA
Encumbrance	28,020
Initial cost [Abstract]
Land	4,498
Buildings and improvements	17,962
Costs capitalized subsequent to acquisition	3,101
Gross amount carried at close of period [Abstract]
Land and improvements	4,962
Buildings and improvements	20,599
Total	25,561	[1]
Accumulated depreciation	6,910
Date of construction	1970
Date acquired	11/01
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Alpine [Member] | Alpine Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Alpine Village
Units	306
Location	Alpine, CA
Encumbrance	15,690
Initial cost [Abstract]
Land	4,967
Buildings and improvements	19,728
Costs capitalized subsequent to acquisition	3,061
Gross amount carried at close of period [Abstract]
Land and improvements	4,982
Buildings and improvements	22,775
Total	27,756	[1]
Accumulated depreciation	7,170
Date of construction	1971
Date acquired	12/02
Lives, minimum (in years)	3
Encumbered Apartment Communities [Member] | CA [Member] | Woodland Hills [Member] | Avondale at Warner Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Avondale at Warner Center
Units	446
Location	Woodland Hills, CA
Encumbrance	47,396
Initial cost [Abstract]
Land	10,536
Buildings and improvements	24,522
Costs capitalized subsequent to acquisition	13,764
Gross amount carried at close of period [Abstract]
Land and improvements	10,601
Buildings and improvements	38,221
Total	48,822	[1]
Accumulated depreciation	17,483
Date of construction	1970
Date acquired	01/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Newark [Member] | Bridgeport [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Bridgeport
Units	184
Location	Newark, CA
Encumbrance	22,051
Initial cost [Abstract]
Land	1,608
Buildings and improvements	7,582
Costs capitalized subsequent to acquisition	5,606
Gross amount carried at close of period [Abstract]
Land and improvements	1,525
Buildings and improvements	13,270
Total	14,796	[1]
Accumulated depreciation	8,870
Date of construction	1987
Date acquired	07/87
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Anaheim [Member] | Barkley, The [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Barkley, The	[2]
Units	161	[2]
Location	Anaheim, CA	[2]
Encumbrance	17,015	[2]
Initial cost [Abstract]
Land	0	[2]
Buildings and improvements	8,520	[2]
Costs capitalized subsequent to acquisition	4,229	[2]
Gross amount carried at close of period [Abstract]
Land and improvements	2,353	[2]
Buildings and improvements	10,396	[2]
Total	12,749	[1],[2]
Accumulated depreciation	3,975	[2]
Date of construction	1984	[2]
Date acquired	04/00	[2]
Lives, minimum (in years)	3	[2]
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | San Ramon [Member] | Bel Air [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Bel Air
Units	462
Location	San Ramon, CA
Encumbrance	56,759
Initial cost [Abstract]
Land	12,105
Buildings and improvements	18,252
Costs capitalized subsequent to acquisition	19,590
Gross amount carried at close of period [Abstract]
Land and improvements	12,682
Buildings and improvements	37,265
Total	49,947	[1]
Accumulated depreciation	17,133
Date of construction	1988
Date acquired	01/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | San Ramon [Member] | Canyon Oaks [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Canyon Oaks
Units	250
Location	San Ramon, CA
Encumbrance	29,389
Initial cost [Abstract]
Land	19,088
Buildings and improvements	44,473
Costs capitalized subsequent to acquisition	1,029
Gross amount carried at close of period [Abstract]
Land and improvements	19,088
Buildings and improvements	45,501
Total	64,590	[1]
Accumulated depreciation	7,191
Date of construction	2005
Date acquired	05/07
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | San Ramon [Member] | Mill Creek at Windermere [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Mill Creek at Windermere
Units	400
Location	San Ramon, CA
Encumbrance	50,787
Initial cost [Abstract]
Land	29,551
Buildings and improvements	69,032
Costs capitalized subsequent to acquisition	1,242
Gross amount carried at close of period [Abstract]
Land and improvements	29,551
Buildings and improvements	70,274
Total	99,825	[1]
Accumulated depreciation	10,199
Date of construction	2005
Date acquired	09/07
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Camarillo [Member] | Camarillo Oaks [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Camarillo Oaks
Units	564
Location	Camarillo, CA
Encumbrance	48,622
Initial cost [Abstract]
Land	10,953
Buildings and improvements	25,254
Costs capitalized subsequent to acquisition	2,362
Gross amount carried at close of period [Abstract]
Land and improvements	11,075
Buildings and improvements	27,494
Total	38,569	[1]
Accumulated depreciation	14,171
Date of construction	1985
Date acquired	07/96
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Camarillo [Member] | Camino Ruiz Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Camino Ruiz Square
Units	160
Location	Camarillo, CA
Encumbrance	21,110
Initial cost [Abstract]
Land	6,871
Buildings and improvements	26,119
Costs capitalized subsequent to acquisition	685
Gross amount carried at close of period [Abstract]
Land and improvements	6,931
Buildings and improvements	26,744
Total	33,675	[1]
Accumulated depreciation	4,555
Date of construction	1990
Date acquired	12/06
Lives, minimum (in years)	3
Encumbered Apartment Communities [Member] | CA [Member] | Fullerton [Member] | Capri at Sunny Hills [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Capri at Sunny Hills
Units	100
Location	Fullerton, CA
Encumbrance	18,132
Initial cost [Abstract]
Land	3,337
Buildings and improvements	13,320
Costs capitalized subsequent to acquisition	5,638
Gross amount carried at close of period [Abstract]
Land and improvements	4,048
Buildings and improvements	18,248
Total	22,295	[1]
Accumulated depreciation	6,026
Date of construction	1961
Date acquired	09/01
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Fullerton [Member] | Wilshire Promenade [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Wilshire Promenade
Units	149
Location	Fullerton, CA
Encumbrance	18,560
Initial cost [Abstract]
Land	3,118
Buildings and improvements	7,385
Costs capitalized subsequent to acquisition	6,395
Gross amount carried at close of period [Abstract]
Land and improvements	3,797
Buildings and improvements	13,101
Total	16,898	[1]
Accumulated depreciation	5,288
Date of construction	1992
Date acquired	01/97
Lives, minimum (in years)	30
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Studio City [Member] | Coldwater Canyon [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Coldwater Canyon
Units	39
Location	Studio City, CA
Encumbrance	5,623
Initial cost [Abstract]
Land	1,674
Buildings and improvements	6,640
Costs capitalized subsequent to acquisition	1,107
Gross amount carried at close of period [Abstract]
Land and improvements	1,676
Buildings and improvements	7,746
Total	9,421	[1]
Accumulated depreciation	1,589
Date of construction	1979
Date acquired	05/07
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Hemet [Member] | Devonshire [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Devonshire
Units	276
Location	Hemet, CA
Encumbrance	10,216
Initial cost [Abstract]
Land	3,470
Buildings and improvements	13,786
Costs capitalized subsequent to acquisition	1,981
Gross amount carried at close of period [Abstract]
Land and improvements	3,482
Buildings and improvements	15,755
Total	19,237	[1]
Accumulated depreciation	5,080
Date of construction	1988
Date acquired	12/02
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Playa Vista [Member] | Fountain Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Fountain Park
Units	705
Location	Playa Vista, CA
Encumbrance	97,747
Initial cost [Abstract]
Land	25,073
Buildings and improvements	94,980
Costs capitalized subsequent to acquisition	20,409
Gross amount carried at close of period [Abstract]
Land and improvements	25,203
Buildings and improvements	115,259
Total	140,462	[1]
Accumulated depreciation	31,693
Date of construction	2002
Date acquired	02/04
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Santa Rosa [Member] | Harvest Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Harvest Park
Units	104
Location	Santa Rosa, CA
Encumbrance	10,895
Initial cost [Abstract]
Land	6,700
Buildings and improvements	15,479
Costs capitalized subsequent to acquisition	720
Gross amount carried at close of period [Abstract]
Land and improvements	6,690
Buildings and improvements	16,209
Total	22,899	[1]
Accumulated depreciation	2,769
Date of construction	2004
Date acquired	03/07
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Glendale [Member] | Hampton Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Hampton Place
Units	132
Location	Glendale, CA
Encumbrance	21,602
Initial cost [Abstract]
Land	4,288
Buildings and improvements	11,081
Costs capitalized subsequent to acquisition	3,034
Gross amount carried at close of period [Abstract]
Land and improvements	4,307
Buildings and improvements	14,095
Total	18,403	[1]
Accumulated depreciation	5,901
Date of construction	1970
Date acquired	06/99
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Rancho Palos Verdes [Member] | Highridge [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Highridge
Units	255
Location	Rancho Palos Verdes, CA
Encumbrance	44,807
Initial cost [Abstract]
Land	5,419
Buildings and improvements	18,347
Costs capitalized subsequent to acquisition	20,037
Gross amount carried at close of period [Abstract]
Land and improvements	6,073
Buildings and improvements	37,730
Total	43,803	[1]
Accumulated depreciation	14,420
Date of construction	1972
Date acquired	05/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Issaquah [Member] | Park Hill at Issaquah [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Park Hill at Issaquah
Units	245
Location	Issaquah, CA
Encumbrance	29,956
Initial cost [Abstract]
Land	7,284
Buildings and improvements	21,937
Costs capitalized subsequent to acquisition	1,488
Gross amount carried at close of period [Abstract]
Land and improvements	7,284
Buildings and improvements	23,425
Total	30,709	[1]
Accumulated depreciation	5,965
Date of construction	1999
Date acquired	02/99
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Newbury Park [Member] | Hillcrest Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Hillcrest Park
Units	608
Location	Newbury Park, CA
Encumbrance	70,707
Initial cost [Abstract]
Land	15,318
Buildings and improvements	40,601
Costs capitalized subsequent to acquisition	12,920
Gross amount carried at close of period [Abstract]
Land and improvements	15,755
Buildings and improvements	53,084
Total	68,839	[1]
Accumulated depreciation	23,030
Date of construction	1973
Date acquired	03/98
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Huntington Beach [Member] | Huntington Breakers [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Huntington Breakers
Units	342
Location	Huntington Beach, CA
Encumbrance	39,321
Initial cost [Abstract]
Land	9,306
Buildings and improvements	22,720
Costs capitalized subsequent to acquisition	4,601
Gross amount carried at close of period [Abstract]
Land and improvements	9,315
Buildings and improvements	27,312
Total	36,627	[1]
Accumulated depreciation	12,592
Date of construction	1984
Date acquired	10/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Santa Clara [Member] | Le Parc Luxury Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Le Parc Luxury Apartments
Units	140
Location	Santa Clara, CA
Encumbrance	12,678
Initial cost [Abstract]
Land	3,090
Buildings and improvements	7,421
Costs capitalized subsequent to acquisition	10,705
Gross amount carried at close of period [Abstract]
Land and improvements	3,092
Buildings and improvements	18,123
Total	21,216	[1]
Accumulated depreciation	7,834
Date of construction	1975
Date acquired	02/94
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Long Beach [Member] | Marbrisa [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Marbrisa
Units	202
Location	Long Beach, CA
Encumbrance	19,391
Initial cost [Abstract]
Land	4,700
Buildings and improvements	18,605
Costs capitalized subsequent to acquisition	2,026
Gross amount carried at close of period [Abstract]
Land and improvements	4,760
Buildings and improvements	20,571
Total	25,331	[1]
Accumulated depreciation	6,506
Date of construction	1987
Date acquired	09/02
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Long Beach [Member] | Pathways [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Pathways
Units	296
Location	Long Beach, CA
Encumbrance	38,747
Initial cost [Abstract]
Land	4,083
Buildings and improvements	16,757
Costs capitalized subsequent to acquisition	17,417
Gross amount carried at close of period [Abstract]
Land and improvements	6,239
Buildings and improvements	32,019
Total	38,257	[1]
Accumulated depreciation	18,707
Date of construction	1975
Date acquired	02/91
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Marina Del Rey [Member] | Mirabella [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Mirabella
Units	188
Location	Marina Del Rey, CA
Encumbrance	47,154
Initial cost [Abstract]
Land	6,180
Buildings and improvements	26,673
Costs capitalized subsequent to acquisition	12,221
Gross amount carried at close of period [Abstract]
Land and improvements	6,270
Buildings and improvements	38,803
Total	45,074	[1]
Accumulated depreciation	12,680
Date of construction	2000
Date acquired	05/00
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Oxnard [Member] | Monterey Villas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Monterey Villas
Units	122
Location	Oxnard, CA
Encumbrance	12,776
Initial cost [Abstract]
Land	2,349
Buildings and improvements	5,579
Costs capitalized subsequent to acquisition	4,424
Gross amount carried at close of period [Abstract]
Land and improvements	2,424
Buildings and improvements	9,929
Total	12,352	[1]
Accumulated depreciation	4,209
Date of construction	1974
Date acquired	07/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Oxnard [Member] | Tierra Vista [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Tierra Vista
Units	404
Location	Oxnard, CA
Encumbrance	58,462
Initial cost [Abstract]
Land	13,652
Buildings and improvements	53,336
Costs capitalized subsequent to acquisition	1,836
Gross amount carried at close of period [Abstract]
Land and improvements	13,661
Buildings and improvements	55,164
Total	68,824	[1]
Accumulated depreciation	14,308
Date of construction	2001
Date acquired	01/01
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Cupertino [Member] | Pointe at Cupertino, The [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Pointe at Cupertino, The
Units	116
Location	Cupertino, CA
Encumbrance	12,173
Initial cost [Abstract]
Land	4,505
Buildings and improvements	17,605
Costs capitalized subsequent to acquisition	7,383
Gross amount carried at close of period [Abstract]
Land and improvements	4,505
Buildings and improvements	24,988
Total	29,493	[1]
Accumulated depreciation	5,141
Date of construction	1963
Date acquired	08/98
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Richmond [Member] | San Marcos [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	San Marcos
Units	432
Location	Richmond, CA
Initial cost [Abstract]
Land	15,563
Buildings and improvements	36,204
Costs capitalized subsequent to acquisition	25,997
Gross amount carried at close of period [Abstract]
Land and improvements	22,866
Buildings and improvements	54,898
Total	77,764	[1]
Accumulated depreciation	15,222
Date of construction	2003
Date acquired	11/03
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Fremont [Member] | Stevenson Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Stevenson Place
Units	200
Location	Fremont, CA
Encumbrance	22,320
Initial cost [Abstract]
Land	996
Buildings and improvements	5,582
Costs capitalized subsequent to acquisition	6,594
Gross amount carried at close of period [Abstract]
Land and improvements	1,001
Buildings and improvements	12,171
Total	13,172	[1]
Accumulated depreciation	8,074
Date of construction	1971
Date acquired	04/83
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Fremont [Member] | Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Boulevard
Units	172
Location	Fremont, CA
Initial cost [Abstract]
Land	3,520
Buildings and improvements	8,182
Costs capitalized subsequent to acquisition	9,707
Gross amount carried at close of period [Abstract]
Land and improvements	3,580
Buildings and improvements	17,829
Total	21,409	[1]
Accumulated depreciation	8,521
Date of construction	1978
Date acquired	01/96
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | San Diego [Member] | Summit Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Summit Park
Units	300
Location	San Diego, CA
Encumbrance	19,457
Initial cost [Abstract]
Land	5,959
Buildings and improvements	23,670
Costs capitalized subsequent to acquisition	2,984
Gross amount carried at close of period [Abstract]
Land and improvements	5,977
Buildings and improvements	26,636
Total	32,613	[1]
Accumulated depreciation	8,564
Date of construction	1972
Date acquired	12/02
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | CA [Member] | Tiburon [Member] | Vista Belvedere [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Vista Belvedere
Units	76
Location	Tiburon, CA
Encumbrance	10,499
Initial cost [Abstract]
Land	5,573
Buildings and improvements	11,901
Costs capitalized subsequent to acquisition	3,445
Gross amount carried at close of period [Abstract]
Land and improvements	5,573
Buildings and improvements	15,346
Total	20,919	[1]
Accumulated depreciation	4,457
Date of construction	1963
Date acquired	08/04
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Newcastle [Member] | Castle Creek [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Castle Creek
Units	216
Location	Newcastle, WA
Initial cost [Abstract]
Land	4,149
Buildings and improvements	16,028
Costs capitalized subsequent to acquisition	1,925
Gross amount carried at close of period [Abstract]
Land and improvements	4,833
Buildings and improvements	17,269
Total	22,102	[1]
Accumulated depreciation	8,526
Date of construction	1997
Date acquired	12/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Renton [Member] | Forest View [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Forest View
Units	192
Location	Renton, WA
Initial cost [Abstract]
Land	3,731
Buildings and improvements	14,530
Costs capitalized subsequent to acquisition	979
Gross amount carried at close of period [Abstract]
Land and improvements	3,731
Buildings and improvements	15,509
Total	19,240	[1]
Accumulated depreciation	4,524
Date of construction	1998
Date acquired	10/03
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Renton [Member] | Brighton Ridge [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Brighton Ridge
Units	264
Location	Renton, WA
Encumbrance	14,948
Initial cost [Abstract]
Land	2,623
Buildings and improvements	10,800
Costs capitalized subsequent to acquisition	2,561
Gross amount carried at close of period [Abstract]
Land and improvements	2,656
Buildings and improvements	13,327
Total	15,984	[1]
Accumulated depreciation	6,654
Date of construction	1986
Date acquired	12/96
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Renton [Member] | Fairwood Pond [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Fairwood Pond
Units	194
Location	Renton, WA
Encumbrance	13,574
Initial cost [Abstract]
Land	5,296
Buildings and improvements	15,564
Costs capitalized subsequent to acquisition	1,783
Gross amount carried at close of period [Abstract]
Land and improvements	5,297
Buildings and improvements	17,345
Total	22,643	[1]
Accumulated depreciation	4,511
Date of construction	1997
Date acquired	10/04
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Mukilteo [Member] | Anchor Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Anchor Village
Units	301
Location	Mukilteo, WA
Encumbrance	10,750
Initial cost [Abstract]
Land	2,498
Buildings and improvements	10,595
Costs capitalized subsequent to acquisition	10,541
Gross amount carried at close of period [Abstract]
Land and improvements	2,824
Buildings and improvements	20,810
Total	23,634	[1]
Accumulated depreciation	8,070
Date of construction	1981
Date acquired	01/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Seattle [Member] | Cairns, The [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Cairns, The
Units	100
Location	Seattle, WA
Initial cost [Abstract]
Land	6,937
Buildings and improvements	20,679
Costs capitalized subsequent to acquisition	240
Gross amount carried at close of period [Abstract]
Land and improvements	6,939
Buildings and improvements	20,917
Total	27,856	[1]
Accumulated depreciation	3,215
Date of construction	2006
Date acquired	06/07
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Seattle [Member] | Joule [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Joule
Units	295
Location	Seattle, WA
Initial cost [Abstract]
Land	14,558
Buildings and improvements	69,417
Costs capitalized subsequent to acquisition	1,910
Gross amount carried at close of period [Abstract]
Land and improvements	14,558
Buildings and improvements	71,327
Total	85,885	[1]
Accumulated depreciation	4,467
Date of construction	2010
Date acquired	03/10
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Seattle [Member] | Wharfside Pointe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Wharfside Pointe
Units	142
Location	Seattle, WA
Encumbrance	7,277
Initial cost [Abstract]
Land	2,245
Buildings and improvements	7,020
Costs capitalized subsequent to acquisition	5,530
Gross amount carried at close of period [Abstract]
Land and improvements	2,258
Buildings and improvements	12,538
Total	14,795	[1]
Accumulated depreciation	6,155
Date of construction	1990
Date acquired	06/94
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Bothell [Member] | Canyon Pointe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Canyon Pointe
Units	250
Location	Bothell, WA
Encumbrance	14,689
Initial cost [Abstract]
Land	4,692
Buildings and improvements	18,288
Costs capitalized subsequent to acquisition	3,116
Gross amount carried at close of period [Abstract]
Land and improvements	4,693
Buildings and improvements	21,403
Total	26,096	[1]
Accumulated depreciation	6,118
Date of construction	1990
Date acquired	10/03
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Bothell [Member] | Inglenook Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Inglenook Court
Units	224
Location	Bothell, WA
Encumbrance	8,300
Initial cost [Abstract]
Land	3,467
Buildings and improvements	7,881
Costs capitalized subsequent to acquisition	5,251
Gross amount carried at close of period [Abstract]
Land and improvements	3,474
Buildings and improvements	13,125
Total	16,599	[1]
Accumulated depreciation	7,262
Date of construction	1985
Date acquired	10/94
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Bothell [Member] | Stonehedge Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Stonehedge Village
Units	196
Location	Bothell, WA
Encumbrance	12,907
Initial cost [Abstract]
Land	3,167
Buildings and improvements	12,603
Costs capitalized subsequent to acquisition	3,501
Gross amount carried at close of period [Abstract]
Land and improvements	3,201
Buildings and improvements	16,070
Total	19,271	[1]
Accumulated depreciation	7,642
Date of construction	1986
Date acquired	10/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Bellevue [Member] | Courtyard off Main [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Courtyard off Main
Units	109
Location	Bellevue, WA
Encumbrance	16,491
Initial cost [Abstract]
Land	7,465
Buildings and improvements	21,405
Costs capitalized subsequent to acquisition	1,265
Gross amount carried at close of period [Abstract]
Land and improvements	7,465
Buildings and improvements	22,670
Total	30,135	[1]
Accumulated depreciation	924
Date of construction	2000
Date acquired	10/10
Lives, minimum (in years)	3
Encumbered Apartment Communities [Member] | WA [Member] | Bellevue [Member] | Emerald Ridge - North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Emerald Ridge - North
Units	180
Location	Bellevue, WA
Encumbrance	9,967
Initial cost [Abstract]
Land	3,449
Buildings and improvements	7,801
Costs capitalized subsequent to acquisition	2,592
Gross amount carried at close of period [Abstract]
Land and improvements	3,449
Buildings and improvements	10,393
Total	13,842	[1]
Accumulated depreciation	6,101
Date of construction	1987
Date acquired	11/94
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Bellevue [Member] | Palisades, The [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Palisades, The
Units	192
Location	Bellevue, WA
Encumbrance	21,596
Initial cost [Abstract]
Land	1,560
Buildings and improvements	6,242
Costs capitalized subsequent to acquisition	9,390
Gross amount carried at close of period [Abstract]
Land and improvements	1,565
Buildings and improvements	15,627
Total	17,192	[1]
Accumulated depreciation	9,084
Date of construction	1977
Date acquired	05/90
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Bellevue [Member] | Sammamish View [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Sammamish View
Units	153
Location	Bellevue, WA
Encumbrance	10,020
Initial cost [Abstract]
Land	3,324
Buildings and improvements	7,501
Costs capitalized subsequent to acquisition	5,256
Gross amount carried at close of period [Abstract]
Land and improvements	3,331
Buildings and improvements	12,749
Total	16,081	[1]
Accumulated depreciation	7,296
Date of construction	1986
Date acquired	11/94
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Redmond [Member] | Elevation (Eagle Rim) [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Elevation (Eagle Rim)
Units	157
Location	Redmond, WA
Encumbrance	12,087
Initial cost [Abstract]
Land	4,758
Buildings and improvements	14,285
Costs capitalized subsequent to acquisition	3,840
Gross amount carried at close of period [Abstract]
Land and improvements	4,757
Buildings and improvements	18,125
Total	22,882	[1]
Accumulated depreciation	1,077
Date of construction	1986
Date acquired	06/10
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Kirkland [Member] | Evergreen Heights [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Evergreen Heights
Units	200
Location	Kirkland, WA
Encumbrance	10,143
Initial cost [Abstract]
Land	3,566
Buildings and improvements	13,395
Costs capitalized subsequent to acquisition	2,704
Gross amount carried at close of period [Abstract]
Land and improvements	3,649
Buildings and improvements	16,016
Total	19,665	[1]
Accumulated depreciation	7,619
Date of construction	1990
Date acquired	06/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Issaquah [Member] | Highlands at Wynhaven [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Highlands at Wynhaven
Units	333
Location	Issaquah, WA
Encumbrance	33,859
Initial cost [Abstract]
Land	16,271
Buildings and improvements	48,932
Costs capitalized subsequent to acquisition	3,595
Gross amount carried at close of period [Abstract]
Land and improvements	16,271
Buildings and improvements	52,527
Total	68,798	[1]
Accumulated depreciation	6,280
Date of construction	2000
Date acquired	08/08
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Encumbered Apartment Communities [Member] | WA [Member] | Kent [Member] | Wandering Creek [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Wandering Creek
Units	156
Location	Kent, WA
Encumbrance	5,300
Initial cost [Abstract]
Land	1,285
Buildings and improvements	4,980
Costs capitalized subsequent to acquisition	3,144
Gross amount carried at close of period [Abstract]
Land and improvements	1,296
Buildings and improvements	8,113
Total	9,409	[1]
Accumulated depreciation	4,499
Date of construction	1986
Date acquired	11/95
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Sunnyvale [Member] | Magnolia Lane [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Magnolia Lane	[3]
Units	32	[3]
Location	Sunnyvale, CA	[3]
Initial cost [Abstract]
Land	0	[3]
Buildings and improvements	5,430	[3]
Costs capitalized subsequent to acquisition	173	[3]
Gross amount carried at close of period [Abstract]
Land and improvements	0	[3]
Buildings and improvements	5,603	[3]
Total	5,603	[1],[3]
Accumulated depreciation	871	[3]
Date of construction	2001	[3]
Date acquired	06/07	[3]
Lives, minimum (in years)	3	[3]
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Sunnyvale [Member] | Via [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Via	[4]
Units	284	[4]
Location	Sunnyvale, CA	[4]
Initial cost [Abstract]
Land	22,000	[4]
Buildings and improvements	0	[4]
Costs capitalized subsequent to acquisition	82,270	[4]
Gross amount carried at close of period [Abstract]
Land and improvements	22,016	[4]
Buildings and improvements	82,254	[4]
Total	104,270	[1],[4]
Accumulated depreciation	1,051	[4]
Date of construction	07/09	[4]
Date acquired	04/08	[4]
Lives, minimum (in years)	3	[4]
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Los Angeles [Member] | Marbella, The [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Marbella, The
Units	60
Location	Los Angeles, CA
Initial cost [Abstract]
Land	2,826
Buildings and improvements	11,269
Costs capitalized subsequent to acquisition	2,870
Gross amount carried at close of period [Abstract]
Land and improvements	2,871
Buildings and improvements	14,094
Total	16,965	[1]
Accumulated depreciation	3,874
Date of construction	1991
Date acquired	09/05
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Los Angeles [Member] | Santee Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Santee Court
Units	165
Location	Los Angeles, CA
Initial cost [Abstract]
Land	6,177
Buildings and improvements	24,716
Costs capitalized subsequent to acquisition	518
Gross amount carried at close of period [Abstract]
Land and improvements	6,177
Buildings and improvements	25,233
Total	31,411	[1]
Accumulated depreciation	1,039
Date of construction	2004
Date acquired	10/10
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Los Angeles [Member] | Bellerive [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Bellerive
Units	63
Location	Los Angeles, CA
Initial cost [Abstract]
Land	5,401
Buildings and improvements	21,803
Costs capitalized subsequent to acquisition	363
Gross amount carried at close of period [Abstract]
Land and improvements	5,401
Buildings and improvements	22,166
Total	27,567
Accumulated depreciation	325
Date of construction	2011
Date acquired	08/11
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Los Angeles [Member] | Santee Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Santee Village
Units	73
Location	Los Angeles, CA
Initial cost [Abstract]
Land	3,404
Buildings and improvements	15,601
Costs capitalized subsequent to acquisition	641
Gross amount carried at close of period [Abstract]
Land and improvements	3,404
Buildings and improvements	16,241
Total	19,646
Accumulated depreciation	230
Date of construction	2011
Date acquired	07/11
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Oceanside [Member] | Country Villas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Country Villas
Units	180
Location	Oceanside, CA
Initial cost [Abstract]
Land	4,174
Buildings and improvements	16,583
Costs capitalized subsequent to acquisition	2,183
Gross amount carried at close of period [Abstract]
Land and improvements	4,187
Buildings and improvements	18,753
Total	22,940	[1]
Accumulated depreciation	6,111
Date of construction	1976
Date acquired	12/02
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | San Jose [Member] | Waterford, The [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Waterford, The
Units	238
Location	San Jose, CA
Encumbrance	31,975
Initial cost [Abstract]
Land	11,808
Buildings and improvements	24,500
Costs capitalized subsequent to acquisition	12,053
Gross amount carried at close of period [Abstract]
Land and improvements	15,165
Buildings and improvements	33,195
Total	48,361	[1]
Accumulated depreciation	12,433
Date of construction	2000
Date acquired	06/00
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Alpine [Member] | Alpine Country [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Alpine Country
Units	108
Location	Alpine, CA
Initial cost [Abstract]
Land	1,741
Buildings and improvements	6,914
Costs capitalized subsequent to acquisition	869
Gross amount carried at close of period [Abstract]
Land and improvements	1,746
Buildings and improvements	7,778
Total	9,524	[1]
Accumulated depreciation	2,413
Date of construction	1986
Date acquired	12/02
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Anaheim [Member] | Anavia [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Anavia
Units	250
Location	Anaheim, CA
Initial cost [Abstract]
Land	15,925
Buildings and improvements	63,712
Costs capitalized subsequent to acquisition	5,243
Gross amount carried at close of period [Abstract]
Land and improvements	15,925
Buildings and improvements	68,955
Total	84,880	[1]
Accumulated depreciation	2,360
Date of construction	2009
Date acquired	12/10
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | San Ramon [Member] | Foothill Gardens/Twin Creeks [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Foothill Gardens/Twin Creeks
Units	176
Location	San Ramon, CA
Initial cost [Abstract]
Land	5,875
Buildings and improvements	13,992
Costs capitalized subsequent to acquisition	2,514
Gross amount carried at close of period [Abstract]
Land and improvements	5,964
Buildings and improvements	16,418
Total	22,381	[1]
Accumulated depreciation	8,311
Date of construction	1985
Date acquired	02/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Seattle [Member] | The Bernard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	The Bernard
Units	63
Location	Seattle, CA
Encumbrance	10,344
Initial cost [Abstract]
Land	3,699
Buildings and improvements	11,345
Costs capitalized subsequent to acquisition	5
Gross amount carried at close of period [Abstract]
Land and improvements	3,699
Buildings and improvements	11,350
Total	15,049
Accumulated depreciation	108
Date of construction	2008
Date acquired	09/11
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Glendale [Member] | 416 on Broadway [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	416 on Broadway
Units	115
Location	Glendale, CA
Initial cost [Abstract]
Land	8,557
Buildings and improvements	34,235
Costs capitalized subsequent to acquisition	425
Gross amount carried at close of period [Abstract]
Land and improvements	8,557
Buildings and improvements	34,660
Total	43,217	[1]
Accumulated depreciation	1,207
Date of construction	2009
Date acquired	12/10
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Glendale [Member] | Hampton Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Hampton Court
Units	83
Location	Glendale, CA
Initial cost [Abstract]
Land	2,407
Buildings and improvements	5,672
Costs capitalized subsequent to acquisition	1,843
Gross amount carried at close of period [Abstract]
Land and improvements	2,426
Buildings and improvements	7,496
Total	9,922	[1]
Accumulated depreciation	3,049
Date of construction	1974
Date acquired	06/99
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Santa Clara [Member] | Marina Cove [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Marina Cove	[5]
Units	292	[5]
Location	Santa Clara, CA	[5]
Initial cost [Abstract]
Land	5,320	[5]
Buildings and improvements	16,431	[5]
Costs capitalized subsequent to acquisition	6,402	[5]
Gross amount carried at close of period [Abstract]
Land and improvements	5,324	[5]
Buildings and improvements	22,830	[5]
Total	28,153	[1],[5]
Accumulated depreciation	12,103	[5]
Date of construction	1974	[5]
Date acquired	06/94	[5]
Lives, minimum (in years)	3	[5]
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Santa Clara [Member] | 1000 Kiely
Real Estate and Accumulated Depreciation [Line Items]
Property	1000 Kiely
Units	121
Location	Santa Clara, CA
Initial cost [Abstract]
Land	9,359
Buildings and improvements	21,845
Costs capitalized subsequent to acquisition	1,168
Gross amount carried at close of period [Abstract]
Land and improvements	9,359
Buildings and improvements	23,012
Total	32,372
Accumulated depreciation	601
Date of construction	1971
Date acquired	03/11
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Marina Del Rey [Member] | Marina City Club [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Marina City Club	[6]
Units	101	[6]
Location	Marina Del Rey, CA	[6]
Initial cost [Abstract]
Land	0	[6]
Buildings and improvements	28,167	[6]
Costs capitalized subsequent to acquisition	4,845	[6]
Gross amount carried at close of period [Abstract]
Land and improvements	0	[6]
Buildings and improvements	33,012	[6]
Total	33,012	[1],[6]
Accumulated depreciation	9,046	[6]
Date of construction	1971	[6]
Date acquired	01/04	[6]
Lives, minimum (in years)	3	[6]
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Oxnard [Member] | Mariners Place [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Mariners Place
Units	105
Location	Oxnard, CA
Initial cost [Abstract]
Land	1,555
Buildings and improvements	6,103
Costs capitalized subsequent to acquisition	1,600
Gross amount carried at close of period [Abstract]
Land and improvements	1,562
Buildings and improvements	7,697
Total	9,258	[1]
Accumulated depreciation	3,105
Date of construction	1987
Date acquired	05/00
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | San Diego [Member] | Bluffs II, The [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Bluffs II, The
Units	224
Location	San Diego, CA
Initial cost [Abstract]
Land	3,405
Buildings and improvements	7,743
Costs capitalized subsequent to acquisition	8,622
Gross amount carried at close of period [Abstract]
Land and improvements	3,442
Buildings and improvements	16,328
Total	19,770	[1]
Accumulated depreciation	4,995
Date of construction	1974
Date acquired	06/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | San Diego [Member] | Vista Capri - North [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Vista Capri - North
Units	106
Location	San Diego, CA
Initial cost [Abstract]
Land	1,663
Buildings and improvements	6,609
Costs capitalized subsequent to acquisition	788
Gross amount carried at close of period [Abstract]
Land and improvements	1,668
Buildings and improvements	7,392
Total	9,060	[1]
Accumulated depreciation	2,228
Date of construction	1975
Date acquired	12/02
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Valley Village [Member] | Allegro [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Allegro
Units	96
Location	Valley Village, CA
Initial cost [Abstract]
Land	5,869
Buildings and improvements	23,977
Costs capitalized subsequent to acquisition	792
Gross amount carried at close of period [Abstract]
Land and improvements	5,869
Buildings and improvements	24,769
Total	30,638	[1]
Accumulated depreciation	1,323
Date of construction	2010
Date acquired	10/10
Lives, minimum (in years)	3
Unencumbered Apartment Communities [Member] | CA [Member] | Irvine [Member] | Axis 2300 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Axis 2300
Units	115
Location	Irvine, CA
Initial cost [Abstract]
Land	5,405
Buildings and improvements	33,585
Costs capitalized subsequent to acquisition	438
Gross amount carried at close of period [Abstract]
Land and improvements	5,405
Buildings and improvements	34,023
Total	39,428	[1]
Accumulated depreciation	1,988
Date of construction	2010
Date acquired	08/10
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Belmont [Member] | Belmont Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Belmont Terrace
Units	71
Location	Belmont, CA
Initial cost [Abstract]
Land	4,446
Buildings and improvements	10,290
Costs capitalized subsequent to acquisition	2,118
Gross amount carried at close of period [Abstract]
Land and improvements	4,473
Buildings and improvements	12,381
Total	16,854	[1]
Accumulated depreciation	2,959
Date of construction	1974
Date acquired	10/06
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Chula Vista [Member] | Cambridge [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Cambridge
Units	40
Location	Chula Vista, CA
Initial cost [Abstract]
Land	497
Buildings and improvements	1,973
Costs capitalized subsequent to acquisition	310
Gross amount carried at close of period [Abstract]
Land and improvements	498
Buildings and improvements	2,281
Total	2,780	[1]
Accumulated depreciation	731
Date of construction	1965
Date acquired	12/02
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Chula Vista [Member] | Woodlawn Colonial [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Woodlawn Colonial
Units	159
Location	Chula Vista, CA
Initial cost [Abstract]
Land	2,344
Buildings and improvements	9,311
Costs capitalized subsequent to acquisition	1,607
Gross amount carried at close of period [Abstract]
Land and improvements	2,351
Buildings and improvements	10,911
Total	13,262	[1]
Accumulated depreciation	3,178
Date of construction	1974
Date acquired	12/02
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Goleta [Member] | CBC Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	CBC Apartments
Units	148
Location	Goleta, CA
Initial cost [Abstract]
Land	6,283
Buildings and improvements	24,000
Costs capitalized subsequent to acquisition	2,262
Gross amount carried at close of period [Abstract]
Land and improvements	6,288
Buildings and improvements	26,258
Total	32,545	[1]
Accumulated depreciation	5,650
Date of construction	1962
Date acquired	01/06
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Goleta [Member] | Chimney Sweep Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Chimney Sweep Apartments
Units	91
Location	Goleta, CA
Initial cost [Abstract]
Land	5,558
Buildings and improvements	21,320
Costs capitalized subsequent to acquisition	1,739
Gross amount carried at close of period [Abstract]
Land and improvements	5,618
Buildings and improvements	22,998
Total	28,617	[1]
Accumulated depreciation	5,691
Date of construction	1967
Date acquired	01/06
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Santa Cruz [Member] | Chestnut Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Chestnut Street
Units	96
Location	Santa Cruz, CA
Initial cost [Abstract]
Land	6,582
Buildings and improvements	15,689
Costs capitalized subsequent to acquisition	884
Gross amount carried at close of period [Abstract]
Land and improvements	6,582
Buildings and improvements	16,573
Total	23,155	[1]
Accumulated depreciation	1,967
Date of construction	2002
Date acquired	07/08
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Campbell [Member] | The Commons [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	The Commons
Units	264
Location	Campbell, CA
Initial cost [Abstract]
Land	12,555
Buildings and improvements	29,307
Costs capitalized subsequent to acquisition	3,437
Gross amount carried at close of period [Abstract]
Land and improvements	12,556
Buildings and improvements	32,744
Total	45,299	[1]
Accumulated depreciation	1,710
Date of construction	1973
Date acquired	07/10
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Pasadena [Member] | Monterra del Sol [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Monterra del Sol
Units	85
Location	Pasadena, CA
Initial cost [Abstract]
Land	2,202
Buildings and improvements	4,794
Costs capitalized subsequent to acquisition	4,937
Gross amount carried at close of period [Abstract]
Land and improvements	2,824
Buildings and improvements	9,108
Total	11,933	[1]
Accumulated depreciation	3,437
Date of construction	1972
Date acquired	04/99
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Pasadena [Member] | Monterra del Mar/Rey/Sol [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Monterra del Mar/Rey/Sol
Units	85
Location	Pasadena, CA
Initial cost [Abstract]
Land	2,202
Buildings and improvements	4,794
Costs capitalized subsequent to acquisition	27,732
Gross amount carried at close of period [Abstract]
Land and improvements	8,385
Buildings and improvements	26,344
Total	34,728	[1]
Accumulated depreciation	10,915
Date of construction	1972
Date acquired	04/99
Lives, minimum (in years)	3
Unencumbered Apartment Communities [Member] | CA [Member] | Newport Beach [Member] | Fairways [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Fairways	[7]
Units	74	[7]
Location	Newport Beach, CA	[7]
Initial cost [Abstract]
Land	0	[7]
Buildings and improvements	7,850	[7]
Costs capitalized subsequent to acquisition	2,106	[7]
Gross amount carried at close of period [Abstract]
Land and improvements	9	[7]
Buildings and improvements	9,947	[7]
Total	9,956	[1],[7]
Accumulated depreciation	4,112	[7]
Date of construction	1972	[7]
Date acquired	06/99	[7]
Lives, minimum (in years)	3	[7]
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Berkeley [Member] | Fourth & U [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Fourth & U
Units	171
Location	Berkeley, CA
Initial cost [Abstract]
Land	8,879
Buildings and improvements	52,351
Costs capitalized subsequent to acquisition	1,272
Gross amount carried at close of period [Abstract]
Land and improvements	8,879
Buildings and improvements	53,622
Total	62,502	[1]
Accumulated depreciation	3,275
Date of construction	2010
Date acquired	04/10
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | San Mateo [Member] | Hillsdale Garden Apartments [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Hillsdale Garden Apartments
Units	697
Location	San Mateo, CA
Initial cost [Abstract]
Land	22,000
Buildings and improvements	94,681
Costs capitalized subsequent to acquisition	13,308
Gross amount carried at close of period [Abstract]
Land and improvements	22,244
Buildings and improvements	107,745
Total	129,989	[1]
Accumulated depreciation	18,625
Date of construction	1948
Date acquired	09/06
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Santa Barbara [Member] | Hope Ranch Collection [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Hope Ranch Collection
Units	108
Location	Santa Barbara, CA
Initial cost [Abstract]
Land	4,078
Buildings and improvements	16,877
Costs capitalized subsequent to acquisition	2,011
Gross amount carried at close of period [Abstract]
Land and improvements	4,208
Buildings and improvements	18,758
Total	22,966	[1]
Accumulated depreciation	2,645
Date of construction	1965
Date acquired	03/07
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Ventura [Member] | Lofts at Pinehurst, The [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Lofts at Pinehurst, The
Units	118
Location	Ventura, CA
Initial cost [Abstract]
Land	1,570
Buildings and improvements	3,912
Costs capitalized subsequent to acquisition	3,852
Gross amount carried at close of period [Abstract]
Land and improvements	1,618
Buildings and improvements	7,715
Total	9,334	[1]
Accumulated depreciation	3,120
Date of construction	1971
Date acquired	06/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Ventura [Member] | Pinehurst [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Pinehurst	[8]
Units	28	[8]
Location	Ventura, CA	[8]
Initial cost [Abstract]
Land	355	[8]
Buildings and improvements	1,356	[8]
Costs capitalized subsequent to acquisition	364	[8]
Gross amount carried at close of period [Abstract]
Land and improvements	6	[8]
Buildings and improvements	2,069	[8]
Total	2,075	[1],[8]
Accumulated depreciation	628	[8]
Date of construction	1973	[8]
Date acquired	12/04	[8]
Lives, minimum (in years)	3	[8]
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Ventura [Member] | Woodside Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Woodside Village
Units	145
Location	Ventura, CA
Initial cost [Abstract]
Land	5,331
Buildings and improvements	21,036
Costs capitalized subsequent to acquisition	2,412
Gross amount carried at close of period [Abstract]
Land and improvements	5,341
Buildings and improvements	23,439
Total	28,779	[1]
Accumulated depreciation	5,706
Date of construction	1987
Date acquired	12/04
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Clairemont [Member] | Mesa Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Mesa Village
Units	133
Location	Clairemont, CA
Initial cost [Abstract]
Land	1,888
Buildings and improvements	7,498
Costs capitalized subsequent to acquisition	935
Gross amount carried at close of period [Abstract]
Land and improvements	1,894
Buildings and improvements	8,428
Total	10,321	[1]
Accumulated depreciation	2,536
Date of construction	1963
Date acquired	12/02
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | San Francisco [Member] | Mt. Sutro [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Mt. Sutro
Units	99
Location	San Francisco, CA
Initial cost [Abstract]
Land	2,334
Buildings and improvements	8,507
Costs capitalized subsequent to acquisition	2,504
Gross amount carried at close of period [Abstract]
Land and improvements	2,809
Buildings and improvements	10,536
Total	13,345	[1]
Accumulated depreciation	4,445
Date of construction	1973
Date acquired	06/01
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Encino [Member] | Regency at Encino [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Regency at Encino
Units	75
Location	Encino, CA
Initial cost [Abstract]
Land	3,184
Buildings and improvements	12,737
Costs capitalized subsequent to acquisition	1,094
Gross amount carried at close of period [Abstract]
Land and improvements	3,184
Buildings and improvements	13,830
Total	17,014	[1]
Accumulated depreciation	1,099
Date of construction	1989
Date acquired	12/09
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Spring Valley [Member] | Shadow Point [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Shadow Point
Units	172
Location	Spring Valley, CA
Initial cost [Abstract]
Land	2,812
Buildings and improvements	11,170
Costs capitalized subsequent to acquisition	1,666
Gross amount carried at close of period [Abstract]
Land and improvements	2,820
Buildings and improvements	12,828
Total	15,648	[1]
Accumulated depreciation	4,062
Date of construction	1983
Date acquired	12/02
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Oakland [Member] | The Grand [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	The Grand
Units	238
Location	Oakland, CA
Initial cost [Abstract]
Land	4,531
Buildings and improvements	89,208
Costs capitalized subsequent to acquisition	3,756
Gross amount carried at close of period [Abstract]
Land and improvements	4,531
Buildings and improvements	92,963
Total	97,495	[1]
Accumulated depreciation	9,851
Date of construction	2009
Date acquired	01/09
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | El Cajon [Member] | Tierra del Sol/Norte [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Tierra del Sol/Norte
Units	156
Location	El Cajon, CA
Initial cost [Abstract]
Land	2,455
Buildings and improvements	9,753
Costs capitalized subsequent to acquisition	1,032
Gross amount carried at close of period [Abstract]
Land and improvements	2,463
Buildings and improvements	10,778
Total	13,240	[1]
Accumulated depreciation	3,440
Date of construction	1969
Date acquired	12/02
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Tracy [Member] | Tuscana [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Tuscana
Units	30
Location	Tracy, CA
Initial cost [Abstract]
Land	2,828
Buildings and improvements	6,599
Costs capitalized subsequent to acquisition	156
Gross amount carried at close of period [Abstract]
Land and improvements	2,870
Buildings and improvements	6,712
Total	9,583	[1]
Accumulated depreciation	1,036
Date of construction	2007
Date acquired	02/07
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | CA [Member] | Hollywood [Member] | Muse [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Muse	[4]
Units	152	[4]
Location	Hollywood, CA	[4]
Initial cost [Abstract]
Land	39,100	[4]
Buildings and improvements	0	[4]
Costs capitalized subsequent to acquisition	2,697	[4]
Gross amount carried at close of period [Abstract]
Land and improvements	7,823	[4]
Buildings and improvements	33,974	[4]
Total	41,797	[1],[4]
Accumulated depreciation	1,410	[4]
Date of construction	11/10	[4]
Date acquired	09/10	[4]
Lives, minimum (in years)	3	[4]
Unencumbered Apartment Communities [Member] | WA [Member] | Seattle [Member] | Fountain Court [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Fountain Court
Units	320
Location	Seattle, WA
Initial cost [Abstract]
Land	6,702
Buildings and improvements	27,306
Costs capitalized subsequent to acquisition	2,741
Gross amount carried at close of period [Abstract]
Land and improvements	6,985
Buildings and improvements	29,764
Total	36,749	[1]
Accumulated depreciation	12,332
Date of construction	2000
Date acquired	03/00
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | WA [Member] | Seattle [Member] | Linden Square [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Linden Square
Units	183
Location	Seattle, WA
Initial cost [Abstract]
Land	4,374
Buildings and improvements	11,588
Costs capitalized subsequent to acquisition	1,721
Gross amount carried at close of period [Abstract]
Land and improvements	4,202
Buildings and improvements	13,481
Total	17,683	[1]
Accumulated depreciation	5,091
Date of construction	1994
Date acquired	06/00
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | WA [Member] | Bothell [Member] | Salmon Run at Perry Creek [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Salmon Run at Perry Creek
Units	132
Location	Bothell, WA
Initial cost [Abstract]
Land	3,717
Buildings and improvements	11,483
Costs capitalized subsequent to acquisition	864
Gross amount carried at close of period [Abstract]
Land and improvements	3,801
Buildings and improvements	12,263
Total	16,064	[1]
Accumulated depreciation	4,541
Date of construction	2000
Date acquired	10/00
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | WA [Member] | Bellevue [Member] | Cedar Terrace [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Cedar Terrace
Units	180
Location	Bellevue, WA
Initial cost [Abstract]
Land	5,543
Buildings and improvements	16,442
Costs capitalized subsequent to acquisition	3,347
Gross amount carried at close of period [Abstract]
Land and improvements	5,652
Buildings and improvements	19,679
Total	25,332	[1]
Accumulated depreciation	5,295
Date of construction	1984
Date acquired	01/05
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | WA [Member] | Bellevue [Member] | Foothill Commons [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Foothill Commons
Units	360
Location	Bellevue, WA
Initial cost [Abstract]
Land	2,435
Buildings and improvements	9,821
Costs capitalized subsequent to acquisition	28,563
Gross amount carried at close of period [Abstract]
Land and improvements	2,440
Buildings and improvements	38,378
Total	40,819	[1]
Accumulated depreciation	15,129
Date of construction	1978
Date acquired	03/90
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | WA [Member] | Bellevue [Member] | Woodland Commons [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Woodland Commons
Units	236
Location	Bellevue, WA
Initial cost [Abstract]
Land	2,040
Buildings and improvements	8,727
Costs capitalized subsequent to acquisition	9,235
Gross amount carried at close of period [Abstract]
Land and improvements	2,044
Buildings and improvements	17,958
Total	20,002	[1]
Accumulated depreciation	8,915
Date of construction	1978
Date acquired	03/90
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | WA [Member] | Redmond [Member] | Delano [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Delano
Units	126
Location	Redmond, WA
Initial cost [Abstract]
Land	3,527
Buildings and improvements	10,600
Costs capitalized subsequent to acquisition	0
Gross amount carried at close of period [Abstract]
Land and improvements	3,527
Buildings and improvements	10,600
Total	14,127
Accumulated depreciation	15
Date of construction	2005
Date acquired	12/11
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | WA [Member] | Kirkland [Member] | Bridle Trails [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Bridle Trails
Units	108
Location	Kirkland, WA
Initial cost [Abstract]
Land	1,500
Buildings and improvements	5,930
Costs capitalized subsequent to acquisition	4,922
Gross amount carried at close of period [Abstract]
Land and improvements	1,531
Buildings and improvements	10,821
Total	12,352	[1]
Accumulated depreciation	4,656
Date of construction	1986
Date acquired	10/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | WA [Member] | Kirkland [Member] | Corbella at Juanita Bay [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Corbella at Juanita Bay
Units	169
Location	Kirkland, WA
Initial cost [Abstract]
Land	5,801
Buildings and improvements	17,415
Costs capitalized subsequent to acquisition	645
Gross amount carried at close of period [Abstract]
Land and improvements	5,801
Buildings and improvements	18,060
Total	23,861	[1]
Accumulated depreciation	706
Date of construction	1978
Date acquired	11/10
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Unencumbered Apartment Communities [Member] | WA [Member] | Mill Creek [Member] | The Laurels at Mill Creek [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	The Laurels at Mill Creek
Units	164
Location	Mill Creek, WA
Initial cost [Abstract]
Land	1,559
Buildings and improvements	6,430
Costs capitalized subsequent to acquisition	4,472
Gross amount carried at close of period [Abstract]
Land and improvements	1,595
Buildings and improvements	10,866
Total	12,461	[1]
Accumulated depreciation	4,872
Date of construction	1981
Date acquired	12/96
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Office Buildings [Member] | CA [Member] | Los Angeles [Member] | Essex Hollywood [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	Essex Hollywood
Rentable Square Footage	35,000
Location	Los Angeles, CA
Initial cost [Abstract]
Land	10,200
Buildings and improvements	13,800
Costs capitalized subsequent to acquisition	2,154
Gross amount carried at close of period [Abstract]
Land and improvements	10,200
Buildings and improvements	15,954
Total	26,154	[1]
Accumulated depreciation	3,740
Date of construction	1938
Date acquired	07/06
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Office Buildings [Member] | CA [Member] | Woodland Hills [Member] | 22120 Clarendon [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	22120 Clarendon
Rentable Square Footage	38,900
Location	Woodland Hills, CA
Initial cost [Abstract]
Land	903
Buildings and improvements	3,600
Costs capitalized subsequent to acquisition	1,307
Gross amount carried at close of period [Abstract]
Land and improvements	1,014
Buildings and improvements	4,796
Total	5,810	[1]
Accumulated depreciation	2,358
Date of construction	1982
Date acquired	03/01
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Office Buildings [Member] | CA [Member] | Irvine [Member] | 17461 Derian [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	17461 Derian
Rentable Square Footage	110,000
Location	Irvine, CA
Initial cost [Abstract]
Land	3,079
Buildings and improvements	12,315
Costs capitalized subsequent to acquisition	5,713
Gross amount carried at close of period [Abstract]
Land and improvements	3,105
Buildings and improvements	18,002
Total	21,107	[1]
Accumulated depreciation	8,254
Date of construction	1983
Date acquired	07/00
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Office Buildings [Member] | CA [Member] | Palo Alto [Member] | 925/935 East Meadow [Member]
Real Estate and Accumulated Depreciation [Line Items]
Property	925/935 East Meadow
Rentable Square Footage	31,900
Location	Palo Alto, CA
Initial cost [Abstract]
Land	1,401
Buildings and improvements	3,172
Costs capitalized subsequent to acquisition	7,985
Gross amount carried at close of period [Abstract]
Land and improvements	3,147
Buildings and improvements	9,411
Total	12,558	[1]
Accumulated depreciation	3,173
Date of construction	1988
Date acquired	11/97
Lives, minimum (in years)	3
Lives , maximum (in years)	30
Other Real Estate Assets [Member]
Real Estate and Accumulated Depreciation [Line Items]
Units	298
Encumbrance	5,648
Initial cost [Abstract]
Land	25,139
Buildings and improvements	0
Costs capitalized subsequent to acquisition	19,147
Gross amount carried at close of period [Abstract]
Land and improvements	44,280
Buildings and improvements	0
Total	44,280	[1]
Accumulated depreciation	$ 0
Lives, minimum (in years)	3
Lives , maximum (in years)	- 30

[1] The aggregate cost for federal income tax purposes is approximately $2.80 billion (unaudited).

[2] The land is leased pursuant to a ground lease expiring 2082.

[3] The land is leased pursuant to a ground lease expiring 2070.

[4] All construction costs are reflected as real estate under development in the Company's consolidated balance sheets during active development, or the project is in lease-up.

[5] A portion of land is leased pursuant to a ground lease expiring in 2028.

[6] The land is leased pursuant to a ground lease expiring 2067.

[7] The land is leased pursuant to a ground lease expiring 2027.

[8] The land is leased pursuant to a ground lease expiring in 2028.