Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Real estate assets:
Net operating real estate assets	$ 2,254,429	$ 1,935,319
Real estate under development	9,366	37,083
Net real estate assets	2,263,795	1,972,402
Investments in real estate ventures	130,410	140,560
Cash and cash equivalents	26,484	46,750
Restricted cash	25,768	30,498
Receivables from related parties and affiliated real estate joint ventures	18,517	10,061
Other assets, net	51,276	49,549
Total assets	2,516,250	2,249,820
Liabilities, Noncontrolling Interests and Equity:
Notes payable	937,001	871,403
Notes payable to trusts	119,590	119,590
Exchangeable senior notes	87,663	87,663
Premium (discount) on notes payable	4,402	(2,205)
Lines of credit	215,000	170,467
Accounts payable and accrued expenses	45,079	35,242
Other liabilities	33,754	28,589
Total liabilities	1,442,489	1,310,749
Commitments and contingencies
Extra Space Storage Inc. stockholders' equity:
Preferred stock, $0.01 par value, 50,000,000 shares authorized, no shares issued or outstanding
Common stock, $0.01 par value, 300,000,000 shares authorized, 94,783,590 and 87,587,322 shares issued and outstanding at December 31, 2011 and December 31, 2010, respectively	948	876
Paid-in capital	1,290,021	1,148,820
Accumulated other comprehensive deficit	(7,936)	(5,787)
Accumulated deficit	(264,086)	(262,508)
Total Extra Space Storage Inc. stockholders' equity	1,018,947	881,401
Noncontrolling interest represented by Preferred Operating Partnership units, net of $100,000 note receivable	29,695	29,733
Noncontrolling interests in Operating Partnership	24,018	26,803
Other noncontrolling interests	1,101	1,134
Total noncontrolling interests and equity	1,073,761	939,071
Total liabilities, noncontrolling interests and equity	$ 2,516,250	$ 2,249,820