Schedule III - Real Estate And Accumulated Depreciation (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) ft² item
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	2,483
Net Rentable Square Feet | ft²	168,908
2019 Encumbrances	$ 27,275
Initial Cost, Land	4,124,271
Initial Cost, Buildings & Improvements	9,274,122
Costs Subsequent to Acquisition	2,890,753
Gross Carrying Amount, Land	4,186,873
Gross Carrying Amount, Buildings	12,102,273
Gross Carrying Amount, Total	16,289,146
Accumulated Depreciation	6,623,475
Commercial and Non-Operating Real Estate [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial Cost, Land	13,194
Initial Cost, Buildings & Improvements	26,143
Costs Subsequent to Acquisition	28,811
Gross Carrying Amount, Land	14,231
Gross Carrying Amount, Buildings	53,917
Gross Carrying Amount, Total	68,148
Accumulated Depreciation	$ 40,107
Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life of buildings (years)	5 years
Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life of buildings (years)	25 years
Los Angeles [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	224
Net Rentable Square Feet | ft²	16,168
2019 Encumbrances	$ 498
Initial Cost, Land	510,249
Initial Cost, Buildings & Improvements	924,346
Costs Subsequent to Acquisition	336,653
Gross Carrying Amount, Land	507,863
Gross Carrying Amount, Buildings	1,263,385
Gross Carrying Amount, Total	1,771,248
Accumulated Depreciation	$ 737,208
Houston [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	127
Net Rentable Square Feet | ft²	10,426
Initial Cost, Land	$ 186,320
Initial Cost, Buildings & Improvements	467,084
Costs Subsequent to Acquisition	216,915
Gross Carrying Amount, Land	185,781
Gross Carrying Amount, Buildings	684,538
Gross Carrying Amount, Total	870,319
Accumulated Depreciation	$ 287,542
San Francisco [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	138
Net Rentable Square Feet | ft²	8,982
Initial Cost, Land	$ 241,791
Initial Cost, Buildings & Improvements	527,127
Costs Subsequent to Acquisition	211,251
Gross Carrying Amount, Land	254,541
Gross Carrying Amount, Buildings	725,628
Gross Carrying Amount, Total	980,169
Accumulated Depreciation	$ 456,544
Dallas/Ft. Worth [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	124
Net Rentable Square Feet | ft²	8,991
Initial Cost, Land	$ 176,962
Initial Cost, Buildings & Improvements	437,884
Costs Subsequent to Acquisition	129,900
Gross Carrying Amount, Land	178,562
Gross Carrying Amount, Buildings	566,184
Gross Carrying Amount, Total	744,746
Accumulated Depreciation	$ 281,717
Chicago [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	130
Net Rentable Square Feet | ft²	8,172
Initial Cost, Land	$ 137,165
Initial Cost, Buildings & Improvements	352,595
Costs Subsequent to Acquisition	128,165
Gross Carrying Amount, Land	140,002
Gross Carrying Amount, Buildings	477,923
Gross Carrying Amount, Total	617,925
Accumulated Depreciation	$ 361,662
New York [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	94
Net Rentable Square Feet | ft²	6,939
Initial Cost, Land	$ 250,900
Initial Cost, Buildings & Improvements	548,541
Costs Subsequent to Acquisition	190,536
Gross Carrying Amount, Land	257,237
Gross Carrying Amount, Buildings	732,740
Gross Carrying Amount, Total	989,977
Accumulated Depreciation	$ 418,570
Atlanta [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	104
Net Rentable Square Feet | ft²	6,982
2019 Encumbrances	$ 1,771
Initial Cost, Land	132,631
Initial Cost, Buildings & Improvements	345,587
Costs Subsequent to Acquisition	86,379
Gross Carrying Amount, Land	132,993
Gross Carrying Amount, Buildings	431,604
Gross Carrying Amount, Total	564,597
Accumulated Depreciation	$ 261,138
Seattle/Tacoma [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	97
Net Rentable Square Feet | ft²	6,794
Initial Cost, Land	$ 198,063
Initial Cost, Buildings & Improvements	531,742
Costs Subsequent to Acquisition	104,116
Gross Carrying Amount, Land	198,710
Gross Carrying Amount, Buildings	635,211
Gross Carrying Amount, Total	833,921
Accumulated Depreciation	$ 324,181
Miami [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	94
Net Rentable Square Feet | ft²	6,726
Initial Cost, Land	$ 239,291
Initial Cost, Buildings & Improvements	497,380
Costs Subsequent to Acquisition	105,510
Gross Carrying Amount, Land	241,184
Gross Carrying Amount, Buildings	600,997
Gross Carrying Amount, Total	842,181
Accumulated Depreciation	$ 307,964
Washington DC [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	91
Net Rentable Square Feet | ft²	5,648
Initial Cost, Land	$ 233,905
Initial Cost, Buildings & Improvements	406,769
Costs Subsequent to Acquisition	116,974
Gross Carrying Amount, Land	239,059
Gross Carrying Amount, Buildings	518,589
Gross Carrying Amount, Total	757,648
Accumulated Depreciation	$ 306,497
Orlando/Daytona [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	72
Net Rentable Square Feet | ft²	4,550
2019 Encumbrances	$ 11,886
Initial Cost, Land	140,411
Initial Cost, Buildings & Improvements	253,375
Costs Subsequent to Acquisition	57,731
Gross Carrying Amount, Land	145,892
Gross Carrying Amount, Buildings	305,625
Gross Carrying Amount, Total	451,517
Accumulated Depreciation	$ 154,128
Denver [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	61
Net Rentable Square Feet | ft²	4,531
2019 Encumbrances	$ 9,299
Initial Cost, Land	95,009
Initial Cost, Buildings & Improvements	226,499
Costs Subsequent to Acquisition	92,835
Gross Carrying Amount, Land	95,730
Gross Carrying Amount, Buildings	318,613
Gross Carrying Amount, Total	414,343
Accumulated Depreciation	$ 143,582
Charlotte [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	56
Net Rentable Square Feet | ft²	4,354
Initial Cost, Land	$ 80,253
Initial Cost, Buildings & Improvements	205,370
Costs Subsequent to Acquisition	76,528
Gross Carrying Amount, Land	88,116
Gross Carrying Amount, Buildings	274,035
Gross Carrying Amount, Total	362,151
Accumulated Depreciation	$ 118,762
Minneapolis/St. Paul [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	57
Net Rentable Square Feet | ft²	4,237
2019 Encumbrances	$ 2,905
Initial Cost, Land	111,507
Initial Cost, Buildings & Improvements	233,259
Costs Subsequent to Acquisition	66,017
Gross Carrying Amount, Land	111,672
Gross Carrying Amount, Buildings	299,111
Gross Carrying Amount, Total	410,783
Accumulated Depreciation	$ 117,375
Tampa [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	54
Net Rentable Square Feet | ft²	3,682
Initial Cost, Land	$ 88,919
Initial Cost, Buildings & Improvements	181,402
Costs Subsequent to Acquisition	47,994
Gross Carrying Amount, Land	91,681
Gross Carrying Amount, Buildings	226,634
Gross Carrying Amount, Total	318,315
Accumulated Depreciation	$ 122,703
Philadelphia [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	56
Net Rentable Square Feet | ft²	3,546
Initial Cost, Land	$ 51,682
Initial Cost, Buildings & Improvements	152,406
Costs Subsequent to Acquisition	56,991
Gross Carrying Amount, Land	50,703
Gross Carrying Amount, Buildings	210,376
Gross Carrying Amount, Total	261,079
Accumulated Depreciation	$ 160,000
West Palm Beach [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	46
Net Rentable Square Feet | ft²	3,721
Initial Cost, Land	$ 156,788
Initial Cost, Buildings & Improvements	221,479
Costs Subsequent to Acquisition	60,557
Gross Carrying Amount, Land	157,496
Gross Carrying Amount, Buildings	281,328
Gross Carrying Amount, Total	438,824
Accumulated Depreciation	$ 120,954
Detroit [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	42
Net Rentable Square Feet | ft²	2,950
Initial Cost, Land	$ 63,804
Initial Cost, Buildings & Improvements	168,897
Costs Subsequent to Acquisition	37,770
Gross Carrying Amount, Land	64,654
Gross Carrying Amount, Buildings	205,817
Gross Carrying Amount, Total	270,471
Accumulated Depreciation	$ 111,495
Phoenix [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	40
Net Rentable Square Feet | ft²	2,664
Initial Cost, Land	$ 65,718
Initial Cost, Buildings & Improvements	185,117
Costs Subsequent to Acquisition	27,224
Gross Carrying Amount, Land	65,709
Gross Carrying Amount, Buildings	212,350
Gross Carrying Amount, Total	278,059
Accumulated Depreciation	$ 103,146
Austin [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	32
Net Rentable Square Feet | ft²	2,447
Initial Cost, Land	$ 56,918
Initial Cost, Buildings & Improvements	127,011
Costs Subsequent to Acquisition	43,766
Gross Carrying Amount, Land	58,940
Gross Carrying Amount, Buildings	168,755
Gross Carrying Amount, Total	227,695
Accumulated Depreciation	$ 83,512
Portland [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	43
Net Rentable Square Feet | ft²	2,256
Initial Cost, Land	$ 51,182
Initial Cost, Buildings & Improvements	126,464
Costs Subsequent to Acquisition	27,536
Gross Carrying Amount, Land	51,840
Gross Carrying Amount, Buildings	153,342
Gross Carrying Amount, Total	205,182
Accumulated Depreciation	$ 101,422
Sacramento [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	34
Net Rentable Square Feet | ft²	1,959
Initial Cost, Land	$ 25,141
Initial Cost, Buildings & Improvements	69,409
Costs Subsequent to Acquisition	28,184
Gross Carrying Amount, Land	25,646
Gross Carrying Amount, Buildings	97,088
Gross Carrying Amount, Total	122,734
Accumulated Depreciation	$ 76,661
Raleigh [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	28
Net Rentable Square Feet | ft²	1,975
Initial Cost, Land	$ 50,348
Initial Cost, Buildings & Improvements	99,583
Costs Subsequent to Acquisition	38,195
Gross Carrying Amount, Land	51,479
Gross Carrying Amount, Buildings	136,647
Gross Carrying Amount, Total	188,126
Accumulated Depreciation	$ 60,484
San Diego [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	20
Net Rentable Square Feet | ft²	1,816
Initial Cost, Land	$ 47,884
Initial Cost, Buildings & Improvements	108,911
Costs Subsequent to Acquisition	40,724
Gross Carrying Amount, Land	50,394
Gross Carrying Amount, Buildings	147,125
Gross Carrying Amount, Total	197,519
Accumulated Depreciation	$ 86,884
San Antonio [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	28
Net Rentable Square Feet | ft²	1,791
Initial Cost, Land	$ 27,566
Initial Cost, Buildings & Improvements	76,028
Costs Subsequent to Acquisition	27,030
Gross Carrying Amount, Land	27,524
Gross Carrying Amount, Buildings	103,100
Gross Carrying Amount, Total	130,624
Accumulated Depreciation	$ 66,131
Norfolk [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	36
Net Rentable Square Feet | ft²	2,215
Initial Cost, Land	$ 47,728
Initial Cost, Buildings & Improvements	128,986
Costs Subsequent to Acquisition	22,398
Gross Carrying Amount, Land	46,843
Gross Carrying Amount, Buildings	152,269
Gross Carrying Amount, Total	199,112
Accumulated Depreciation	$ 63,430
Boston [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	27
Net Rentable Square Feet | ft²	1,864
Initial Cost, Land	$ 70,261
Initial Cost, Buildings & Improvements	194,588
Costs Subsequent to Acquisition	24,287
Gross Carrying Amount, Land	70,827
Gross Carrying Amount, Buildings	218,309
Gross Carrying Amount, Total	289,136
Accumulated Depreciation	$ 91,348
Columbus [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	22
Net Rentable Square Feet | ft²	1,629
Initial Cost, Land	$ 25,341
Initial Cost, Buildings & Improvements	64,746
Costs Subsequent to Acquisition	27,256
Gross Carrying Amount, Land	25,448
Gross Carrying Amount, Buildings	91,895
Gross Carrying Amount, Total	117,343
Accumulated Depreciation	$ 44,934
Oaklahoma City [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	22
Net Rentable Square Feet | ft²	1,531
Initial Cost, Land	$ 35,704
Initial Cost, Buildings & Improvements	68,360
Costs Subsequent to Acquisition	13,470
Gross Carrying Amount, Land	35,704
Gross Carrying Amount, Buildings	81,830
Gross Carrying Amount, Total	117,534
Accumulated Depreciation	$ 23,568
Baltimore [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	23
Net Rentable Square Feet | ft²	1,472
Initial Cost, Land	$ 25,176
Initial Cost, Buildings & Improvements	79,734
Costs Subsequent to Acquisition	19,078
Gross Carrying Amount, Land	25,300
Gross Carrying Amount, Buildings	98,688
Gross Carrying Amount, Total	123,988
Accumulated Depreciation	$ 70,717
Indianapolis [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	25
Net Rentable Square Feet | ft²	1,580
Initial Cost, Land	$ 25,752
Initial Cost, Buildings & Improvements	69,619
Costs Subsequent to Acquisition	13,511
Gross Carrying Amount, Land	26,752
Gross Carrying Amount, Buildings	82,130
Gross Carrying Amount, Total	108,882
Accumulated Depreciation	$ 45,217
St. Louis [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	26
Net Rentable Square Feet | ft²	1,443
Initial Cost, Land	$ 20,037
Initial Cost, Buildings & Improvements	56,237
Costs Subsequent to Acquisition	21,854
Gross Carrying Amount, Land	20,680
Gross Carrying Amount, Buildings	77,448
Gross Carrying Amount, Total	98,128
Accumulated Depreciation	$ 63,361
Kansas City [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	24
Net Rentable Square Feet | ft²	1,461
Initial Cost, Land	$ 14,225
Initial Cost, Buildings & Improvements	43,732
Costs Subsequent to Acquisition	28,126
Gross Carrying Amount, Land	14,425
Gross Carrying Amount, Buildings	71,658
Gross Carrying Amount, Total	86,083
Accumulated Depreciation	$ 59,666
Columbia [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	23
Net Rentable Square Feet | ft²	1,331
Initial Cost, Land	$ 20,169
Initial Cost, Buildings & Improvements	57,131
Costs Subsequent to Acquisition	19,882
Gross Carrying Amount, Land	20,928
Gross Carrying Amount, Buildings	76,254
Gross Carrying Amount, Total	97,182
Accumulated Depreciation	$ 35,292
Las Vegas [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	20
Net Rentable Square Feet | ft²	1,259
Initial Cost, Land	$ 23,168
Initial Cost, Buildings & Improvements	52,723
Costs Subsequent to Acquisition	10,296
Gross Carrying Amount, Land	22,417
Gross Carrying Amount, Buildings	63,770
Gross Carrying Amount, Total	86,187
Accumulated Depreciation	$ 48,404
Milwaukee [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	15
Net Rentable Square Feet | ft²	964
2019 Encumbrances	$ 916
Initial Cost, Land	13,189
Initial Cost, Buildings & Improvements	32,071
Costs Subsequent to Acquisition	10,104
Gross Carrying Amount, Land	13,158
Gross Carrying Amount, Buildings	42,206
Gross Carrying Amount, Total	55,364
Accumulated Depreciation	$ 33,057
Cincinnati [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	17
Net Rentable Square Feet | ft²	947
Initial Cost, Land	$ 15,023
Initial Cost, Buildings & Improvements	32,351
Costs Subsequent to Acquisition	22,874
Gross Carrying Amount, Land	14,941
Gross Carrying Amount, Buildings	55,307
Gross Carrying Amount, Total	70,248
Accumulated Depreciation	$ 30,007
Louisville [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	15
Net Rentable Square Feet | ft²	916
Initial Cost, Land	$ 23,563
Initial Cost, Buildings & Improvements	46,108
Costs Subsequent to Acquisition	7,523
Gross Carrying Amount, Land	23,562
Gross Carrying Amount, Buildings	53,632
Gross Carrying Amount, Total	77,194
Accumulated Depreciation	$ 13,630
Jacksonville [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	14
Net Rentable Square Feet | ft²	841
Initial Cost, Land	$ 11,252
Initial Cost, Buildings & Improvements	27,714
Costs Subsequent to Acquisition	11,820
Gross Carrying Amount, Land	11,301
Gross Carrying Amount, Buildings	39,485
Gross Carrying Amount, Total	50,786
Accumulated Depreciation	$ 32,215
Nashville/Bowling Green [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	17
Net Rentable Square Feet | ft²	1,108
Initial Cost, Land	$ 18,787
Initial Cost, Buildings & Improvements	35,425
Costs Subsequent to Acquisition	30,356
Gross Carrying Amount, Land	18,785
Gross Carrying Amount, Buildings	65,783
Gross Carrying Amount, Total	84,568
Accumulated Depreciation	$ 28,543
Honolulu [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	11
Net Rentable Square Feet | ft²	807
Initial Cost, Land	$ 54,184
Initial Cost, Buildings & Improvements	106,299
Costs Subsequent to Acquisition	12,703
Gross Carrying Amount, Land	55,101
Gross Carrying Amount, Buildings	118,085
Gross Carrying Amount, Total	173,186
Accumulated Depreciation	$ 63,344
Greensboro [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	14
Net Rentable Square Feet | ft²	845
Initial Cost, Land	$ 13,413
Initial Cost, Buildings & Improvements	35,326
Costs Subsequent to Acquisition	13,644
Gross Carrying Amount, Land	15,502
Gross Carrying Amount, Buildings	46,881
Gross Carrying Amount, Total	62,383
Accumulated Depreciation	$ 25,853
Colorado Springs [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	14
Net Rentable Square Feet | ft²	992
Initial Cost, Land	$ 10,588
Initial Cost, Buildings & Improvements	38,237
Costs Subsequent to Acquisition	22,069
Gross Carrying Amount, Land	10,584
Gross Carrying Amount, Buildings	60,310
Gross Carrying Amount, Total	70,894
Accumulated Depreciation	$ 28,108
Chattanooga [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	10
Net Rentable Square Feet | ft²	695
Initial Cost, Land	$ 6,569
Initial Cost, Buildings & Improvements	26,045
Costs Subsequent to Acquisition	7,500
Gross Carrying Amount, Land	6,371
Gross Carrying Amount, Buildings	33,743
Gross Carrying Amount, Total	40,114
Accumulated Depreciation	$ 14,691
Hartford/New Haven [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	11
Net Rentable Square Feet | ft²	693
Initial Cost, Land	$ 6,778
Initial Cost, Buildings & Improvements	19,959
Costs Subsequent to Acquisition	21,850
Gross Carrying Amount, Land	8,443
Gross Carrying Amount, Buildings	40,144
Gross Carrying Amount, Total	48,587
Accumulated Depreciation	$ 31,810
Savannah [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	12
Net Rentable Square Feet | ft²	686
Initial Cost, Land	$ 33,094
Initial Cost, Buildings & Improvements	42,465
Costs Subsequent to Acquisition	2,576
Gross Carrying Amount, Land	31,766
Gross Carrying Amount, Buildings	46,369
Gross Carrying Amount, Total	78,135
Accumulated Depreciation	$ 15,910
Charleston [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	14
Net Rentable Square Feet | ft²	950
Initial Cost, Land	$ 16,947
Initial Cost, Buildings & Improvements	56,793
Costs Subsequent to Acquisition	17,256
Gross Carrying Amount, Land	17,923
Gross Carrying Amount, Buildings	73,073
Gross Carrying Amount, Total	90,996
Accumulated Depreciation	$ 23,801
Fort Myers/Naples [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	10
Net Rentable Square Feet | ft²	770
Initial Cost, Land	$ 21,522
Initial Cost, Buildings & Improvements	46,395
Costs Subsequent to Acquisition	5,352
Gross Carrying Amount, Land	21,757
Gross Carrying Amount, Buildings	51,512
Gross Carrying Amount, Total	73,269
Accumulated Depreciation	$ 17,493
New Orleans [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	9
Net Rentable Square Feet | ft²	627
Initial Cost, Land	$ 9,205
Initial Cost, Buildings & Improvements	30,832
Costs Subsequent to Acquisition	6,254
Gross Carrying Amount, Land	9,373
Gross Carrying Amount, Buildings	36,918
Gross Carrying Amount, Total	46,291
Accumulated Depreciation	$ 24,916
Greensville/Spartanburg/Asheville [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	11
Net Rentable Square Feet | ft²	623
Initial Cost, Land	$ 9,036
Initial Cost, Buildings & Improvements	20,767
Costs Subsequent to Acquisition	10,051
Gross Carrying Amount, Land	9,965
Gross Carrying Amount, Buildings	29,889
Gross Carrying Amount, Total	39,854
Accumulated Depreciation	$ 20,324
Reno [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	7
Net Rentable Square Feet | ft²	559
Initial Cost, Land	$ 5,487
Initial Cost, Buildings & Improvements	18,704
Costs Subsequent to Acquisition	4,058
Gross Carrying Amount, Land	5,487
Gross Carrying Amount, Buildings	22,762
Gross Carrying Amount, Total	28,249
Accumulated Depreciation	$ 12,110
Birmingham [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	14
Net Rentable Square Feet | ft²	538
Initial Cost, Land	$ 5,229
Initial Cost, Buildings & Improvements	17,835
Costs Subsequent to Acquisition	13,326
Gross Carrying Amount, Land	5,117
Gross Carrying Amount, Buildings	31,273
Gross Carrying Amount, Total	36,390
Accumulated Depreciation	$ 27,335
Salt Lake City [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	8
Net Rentable Square Feet | ft²	517
Initial Cost, Land	$ 7,846
Initial Cost, Buildings & Improvements	15,947
Costs Subsequent to Acquisition	4,860
Gross Carrying Amount, Land	7,495
Gross Carrying Amount, Buildings	21,158
Gross Carrying Amount, Total	28,653
Accumulated Depreciation	$ 14,506
Memphis [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	9
Net Rentable Square Feet | ft²	510
Initial Cost, Land	$ 7,962
Initial Cost, Buildings & Improvements	21,981
Costs Subsequent to Acquisition	9,049
Gross Carrying Amount, Land	9,315
Gross Carrying Amount, Buildings	29,677
Gross Carrying Amount, Total	38,992
Accumulated Depreciation	$ 20,278
Buffalo/Rochester [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	9
Net Rentable Square Feet | ft²	462
Initial Cost, Land	$ 6,785
Initial Cost, Buildings & Improvements	17,954
Costs Subsequent to Acquisition	3,836
Gross Carrying Amount, Land	6,783
Gross Carrying Amount, Buildings	21,792
Gross Carrying Amount, Total	28,575
Accumulated Depreciation	$ 13,589
Richmond [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	13
Net Rentable Square Feet | ft²	652
Initial Cost, Land	$ 18,092
Initial Cost, Buildings & Improvements	40,160
Costs Subsequent to Acquisition	5,172
Gross Carrying Amount, Land	17,897
Gross Carrying Amount, Buildings	45,527
Gross Carrying Amount, Total	63,424
Accumulated Depreciation	$ 18,118
Tucson [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	7
Net Rentable Square Feet | ft²	439
Initial Cost, Land	$ 9,403
Initial Cost, Buildings & Improvements	25,491
Costs Subsequent to Acquisition	5,734
Gross Carrying Amount, Land	9,884
Gross Carrying Amount, Buildings	30,744
Gross Carrying Amount, Total	40,628
Accumulated Depreciation	$ 19,101
Cleveland/Akron [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	7
Net Rentable Square Feet | ft²	433
Initial Cost, Land	$ 4,070
Initial Cost, Buildings & Improvements	16,139
Costs Subsequent to Acquisition	5,483
Gross Carrying Amount, Land	4,463
Gross Carrying Amount, Buildings	21,229
Gross Carrying Amount, Total	25,692
Accumulated Depreciation	$ 11,954
Wichita [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	7
Net Rentable Square Feet | ft²	433
Initial Cost, Land	$ 2,017
Initial Cost, Buildings & Improvements	6,691
Costs Subsequent to Acquisition	7,265
Gross Carrying Amount, Land	2,130
Gross Carrying Amount, Buildings	13,843
Gross Carrying Amount, Total	15,973
Accumulated Depreciation	$ 11,755
Mobile [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	10
Net Rentable Square Feet | ft²	452
Initial Cost, Land	$ 4,688
Initial Cost, Buildings & Improvements	21,170
Costs Subsequent to Acquisition	4,906
Gross Carrying Amount, Land	4,515
Gross Carrying Amount, Buildings	26,249
Gross Carrying Amount, Total	30,764
Accumulated Depreciation	$ 12,900
Omaha [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	4
Net Rentable Square Feet | ft²	377
Initial Cost, Land	$ 7,491
Initial Cost, Buildings & Improvements	20,930
Costs Subsequent to Acquisition	3,019
Gross Carrying Amount, Land	7,491
Gross Carrying Amount, Buildings	23,949
Gross Carrying Amount, Total	31,440
Accumulated Depreciation	$ 3,189
Monterey/Salinas [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	7
Net Rentable Square Feet | ft²	329
Initial Cost, Land	$ 8,465
Initial Cost, Buildings & Improvements	24,151
Costs Subsequent to Acquisition	4,170
Gross Carrying Amount, Land	8,455
Gross Carrying Amount, Buildings	28,331
Gross Carrying Amount, Total	36,786
Accumulated Depreciation	$ 21,033
Palm Springs [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	3
Net Rentable Square Feet | ft²	242
Initial Cost, Land	$ 8,309
Initial Cost, Buildings & Improvements	18,065
Costs Subsequent to Acquisition	1,286
Gross Carrying Amount, Land	8,309
Gross Carrying Amount, Buildings	19,351
Gross Carrying Amount, Total	27,660
Accumulated Depreciation	$ 10,356
Evansville [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	5
Net Rentable Square Feet | ft²	326
Initial Cost, Land	$ 2,340
Initial Cost, Buildings & Improvements	14,316
Costs Subsequent to Acquisition	1,192
Gross Carrying Amount, Land	2,312
Gross Carrying Amount, Buildings	15,536
Gross Carrying Amount, Total	17,848
Accumulated Depreciation	$ 3,577
Dayton [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	5
Net Rentable Square Feet | ft²	230
Initial Cost, Land	$ 1,074
Initial Cost, Buildings & Improvements	8,975
Costs Subsequent to Acquisition	4,817
Gross Carrying Amount, Land	1,073
Gross Carrying Amount, Buildings	13,793
Gross Carrying Amount, Total	14,866
Accumulated Depreciation	$ 7,066
Augusta [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	6
Net Rentable Square Feet | ft²	345
Initial Cost, Land	$ 4,984
Initial Cost, Buildings & Improvements	13,120
Costs Subsequent to Acquisition	3,633
Gross Carrying Amount, Land	4,984
Gross Carrying Amount, Buildings	16,753
Gross Carrying Amount, Total	21,737
Accumulated Depreciation	$ 5,939
Fort Wayne [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	3
Net Rentable Square Feet | ft²	168
Initial Cost, Land	$ 349
Initial Cost, Buildings & Improvements	3,594
Costs Subsequent to Acquisition	3,126
Gross Carrying Amount, Land	349
Gross Carrying Amount, Buildings	6,720
Gross Carrying Amount, Total	7,069
Accumulated Depreciation	$ 5,802
Providence [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	3
Net Rentable Square Feet | ft²	155
Initial Cost, Land	$ 995
Initial Cost, Buildings & Improvements	11,206
Costs Subsequent to Acquisition	2,957
Gross Carrying Amount, Land	995
Gross Carrying Amount, Buildings	14,163
Gross Carrying Amount, Total	15,158
Accumulated Depreciation	$ 6,295
Huntsville/Decatur [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	3
Net Rentable Square Feet | ft²	153
Initial Cost, Land	$ 1,024
Initial Cost, Buildings & Improvements	3,321
Costs Subsequent to Acquisition	3,029
Gross Carrying Amount, Land	971
Gross Carrying Amount, Buildings	6,403
Gross Carrying Amount, Total	7,374
Accumulated Depreciation	$ 5,963
Shreveport [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	2
Net Rentable Square Feet | ft²	150
Initial Cost, Land	$ 817
Initial Cost, Buildings & Improvements	3,030
Costs Subsequent to Acquisition	2,254
Gross Carrying Amount, Land	741
Gross Carrying Amount, Buildings	5,360
Gross Carrying Amount, Total	6,101
Accumulated Depreciation	$ 4,678
Springfield/Holyoke [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	2
Net Rentable Square Feet | ft²	144
Initial Cost, Land	$ 1,428
Initial Cost, Buildings & Improvements	3,380
Costs Subsequent to Acquisition	1,815
Gross Carrying Amount, Land	1,427
Gross Carrying Amount, Buildings	5,196
Gross Carrying Amount, Total	6,623
Accumulated Depreciation	$ 4,671
Rochester [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	2
Net Rentable Square Feet | ft²	99
Initial Cost, Land	$ 1,047
Initial Cost, Buildings & Improvements	2,246
Costs Subsequent to Acquisition	2,090
Gross Carrying Amount, Land	980
Gross Carrying Amount, Buildings	4,403
Gross Carrying Amount, Total	5,383
Accumulated Depreciation	$ 3,931
Santa Barbara [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	2
Net Rentable Square Feet | ft²	98
Initial Cost, Land	$ 5,733
Initial Cost, Buildings & Improvements	9,106
Costs Subsequent to Acquisition	452
Gross Carrying Amount, Land	5,733
Gross Carrying Amount, Buildings	9,558
Gross Carrying Amount, Total	15,291
Accumulated Depreciation	$ 5,417
Topeka [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	2
Net Rentable Square Feet | ft²	94
Initial Cost, Land	$ 225
Initial Cost, Buildings & Improvements	1,419
Costs Subsequent to Acquisition	2,067
Gross Carrying Amount, Land	225
Gross Carrying Amount, Buildings	3,486
Gross Carrying Amount, Total	3,711
Accumulated Depreciation	$ 2,966
Lansing [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	2
Net Rentable Square Feet | ft²	88
Initial Cost, Land	$ 556
Initial Cost, Buildings & Improvements	2,882
Costs Subsequent to Acquisition	891
Gross Carrying Amount, Land	556
Gross Carrying Amount, Buildings	3,773
Gross Carrying Amount, Total	4,329
Accumulated Depreciation	$ 2,239
Roanoke [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	3
Net Rentable Square Feet | ft²	159
Initial Cost, Land	$ 2,147
Initial Cost, Buildings & Improvements	13,801
Costs Subsequent to Acquisition	842
Gross Carrying Amount, Land	2,147
Gross Carrying Amount, Buildings	14,643
Gross Carrying Amount, Total	16,790
Accumulated Depreciation	$ 2,523
Flint [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	1
Net Rentable Square Feet | ft²	56
Initial Cost, Land	$ 543
Initial Cost, Buildings & Improvements	3,068
Costs Subsequent to Acquisition	242
Gross Carrying Amount, Land	542
Gross Carrying Amount, Buildings	3,311
Gross Carrying Amount, Total	3,853
Accumulated Depreciation	$ 1,826
Joplin [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	1
Net Rentable Square Feet | ft²	56
Initial Cost, Land	$ 264
Initial Cost, Buildings & Improvements	904
Costs Subsequent to Acquisition	1,012
Gross Carrying Amount, Land	264
Gross Carrying Amount, Buildings	1,916
Gross Carrying Amount, Total	2,180
Accumulated Depreciation	$ 1,579
Syracuse [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	1
Net Rentable Square Feet | ft²	55
Initial Cost, Land	$ 545
Initial Cost, Buildings & Improvements	1,279
Costs Subsequent to Acquisition	820
Gross Carrying Amount, Land	545
Gross Carrying Amount, Buildings	2,099
Gross Carrying Amount, Total	2,644
Accumulated Depreciation	$ 1,976
Modesto/Fresno/Stockton [Member] | Self-Storage Facilities [Member]
Real Estate and Accumulated Depreciation [Line Items]
No. of Facilities | item	1
Net Rentable Square Feet | ft²	33
Initial Cost, Land	$ 44
Initial Cost, Buildings & Improvements	206
Costs Subsequent to Acquisition	968
Gross Carrying Amount, Land	193
Gross Carrying Amount, Buildings	1,025
Gross Carrying Amount, Total	1,218
Accumulated Depreciation	$ 795