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STORAGE PROPERTIES - Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
STORAGE FACILITIES
Storage properties	$ 5,536,376	$ 5,489,754
Less: Accumulated depreciation	(1,026,337)	(983,940)
Storage properties, net (including VIE assets of $132,927 and $119,345, respectively)	4,510,039	4,505,814
Land
STORAGE FACILITIES
Storage properties	1,113,737	1,093,503
Buildings and improvements
STORAGE FACILITIES
Storage properties	4,197,607	4,122,995
Equipment
STORAGE FACILITIES
Storage properties	123,199	123,044
Construction in progress
STORAGE FACILITIES
Storage properties	60,419	108,316
Right-of-use assets - finance leases
STORAGE FACILITIES
Storage properties	$ 41,414	$ 41,896

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The cumulative amount of depreciation for real estate property held for investment purposes.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.7-03.1(3))
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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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