10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2015

or

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                     .

Commission File Number: 001-32269

EXTRA SPACE STORAGE INC.

(Exact name of registrant as specified in its charter)

Maryland	20-1076777
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

2795 East Cottonwood Parkway, Suite 400

Salt Lake City, Utah 84121

(Address of principal executive offices)

Registrant’s telephone number, including area code: (801) 365-4600

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

The number of shares outstanding of the registrant’s common stock, par value $0.01 per share, as of April 30, 2015, was 116,494,142.

EXTRA SPACE STORAGE INC.

TABLE OF CONTENTS

STATEMENT ON FORWARD-LOOKING INFORMATION	3
PART I. FINANCIAL INFORMATION	4
ITEM 1. FINANCIAL STATEMENTS	4
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited)	10
ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	25
ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	37
ITEM 4. CONTROLS AND PROCEDURES	38
PART II. OTHER INFORMATION	38
ITEM 1. LEGAL PROCEEDINGS	38
ITEM 1A. RISK FACTORS	38
ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	38
ITEM 3. DEFAULTS UPON SENIOR SECURITIES	39
ITEM 4. MINE SAFETY DISCLOSURES	39
ITEM 5. OTHER INFORMATION	39
ITEM 6. EXHIBITS	40
SIGNATURES	41

2

STATEMENT ON FORWARD-LOOKING INFORMATION

Certain information presented in this report contains “forward-looking statements” within the meaning of the federal securities laws. Forward-looking statements include statements concerning our plans, objectives, goals, strategies, future events, future revenues or performance, capital expenditures, financing needs, plans or intentions relating to acquisitions and other information that is not historical information. In some cases, forward-looking statements can be identified by terminology such as “believes,” “expects,” “estimates,” “may,” “will,” “should,” “anticipates” or “intends,” or the negative of such terms or other comparable terminology, or by discussions of strategy. We may also make additional forward-looking statements from time to time. All such subsequent forward-looking statements, whether written or oral, by us or on our behalf, are also expressly qualified by these cautionary statements.

All forward-looking statements, including without limitation, management’s examination of historical operating trends and estimates of future earnings, are based upon our current expectations and various assumptions. Our expectations, beliefs and projections are expressed in good faith and we believe there is a reasonable basis for them, but there can be no assurance that management’s expectations, beliefs and projections will result or be achieved. All forward-looking statements apply only as of the date made. We undertake no obligation to publicly update or revise forward-looking statements which may be made to reflect events or circumstances after the date made or to reflect the occurrence of unanticipated events.

There are a number of risks and uncertainties that could cause our actual results to differ materially from the forward-looking statements contained in or contemplated by this report. Any forward-looking statements should be considered in light of the risks referenced in “Part II. Item 1A. Risk Factors” below and in “Part I. Item 1A. Risk Factors” included in our most recent Annual Report on Form 10-K. Such factors include, but are not limited to:

• adverse changes in general economic conditions, the real estate industry and the markets in which we operate;

• failure to close pending acquisitions on expected terms, or at all;

• the effect of competition from new and existing stores or other storage alternatives, which could cause rents and occupancy rates to decline;

• difficulties in our ability to evaluate, finance, complete and integrate acquisitions and developments successfully and to lease up those stores, which could adversely affect our profitability;

• potential liability for uninsured losses and environmental contamination;

• the impact of the regulatory environment as well as national, state and local laws and regulations including, without limitation, those governing real estate investment trusts (“REITs”), tenant reinsurance and other aspects of our business, which could adversely affect our results;

• disruptions in credit and financial markets and resulting difficulties in raising capital or obtaining credit at reasonable rates or at all, which could impede our ability to grow;

• increased interest rates and operating costs;

• reductions in asset valuations and related impairment charges;

• the failure of our joint venture partners to fulfill their obligations to us or their pursuit of actions that are inconsistent with our objectives;

• the failure to maintain our REIT status for federal income tax purposes;

• economic uncertainty due to the impact of war or terrorism, which could adversely affect our business plan; and

• difficulties in our ability to attract and retain qualified personnel and management members.

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PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

Extra Space Storage Inc.

Condensed Consolidated Balance Sheets

(amounts in thousands, except share data)

	March 31, 2015			December 31, 2014
	(Unaudited)
Assets:
Real estate assets, net	$	4,197,853		$	4,135,696
Investments in unconsolidated real estate ventures		85,602			85,711
Cash and cash equivalents		45,304			47,663
Restricted cash		35,350			25,245
Receivables from related parties and affiliated real estate joint ventures		3,136			11,778
Other assets, net		96,900			96,014
Total assets	$	4,464,145		$	4,402,107
Liabilities, Noncontrolling Interests and Equity:
Notes payable	$	1,972,957		$	1,872,067
Premium on notes payable		2,534			3,281
Exchangeable senior notes		250,000			250,000
Discount on exchangeable senior notes		(12,169	)		(13,054	)
Notes payable to trusts		119,590			119,590
Lines of credit		99,000			138,000
Accounts payable and accrued expenses		71,553			65,521
Other liabilities		53,625			54,719
Total liabilities		2,557,090			2,490,124
Commitments and contingencies
Noncontrolling Interests and Equity:
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, 500,000,000 shares authorized, 116,458,159 and 116,360,239 shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively		1,164			1,163
Additional paid-in capital		1,998,240			1,995,484
Accumulated other comprehensive loss		(7,800	)		(1,484	)
Accumulated deficit		(258,728	)		(257,738	)
Total Extra Space Storage Inc. stockholders’ equity		1,732,876			1,737,425
Noncontrolling interest represented by Preferred Operating Partnership units, net of $120,230 notes receivable		81,088			81,152
Noncontrolling interests in Operating Partnership		92,105			92,422
Other noncontrolling interests		986			984
Total noncontrolling interests and equity		1,907,055			1,911,983
Total liabilities, noncontrolling interests and equity	$	4,464,145		$	4,402,107

See accompanying notes to unaudited condensed consolidated financial statements.

4

Extra Space Storage Inc.

Condensed Consolidated Statements of Operations

(amounts in thousands, except share data)

(unaudited)

	For the Three Months Ended March 31,
	2015			2014
Revenues:
Property rental	$	148,894		$	132,001
Tenant reinsurance		16,510			13,463
Management fees and other income		7,750			7,123
Total revenues		173,154			152,587
Expenses:
Property operations		47,244			43,482
Tenant reinsurance		2,928			2,567
Acquisition related costs		869			2,056
General and administrative		16,249			15,709
Depreciation and amortization		30,428			28,375
Total expenses		97,718			92,189
Income from operations		75,436			60,398
Interest expense		(21,431	)		(19,598	)
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes		(697	)		(662	)
Interest income		856			269
Interest income on note receivable from Preferred Operating Partnership unit holder		1,213			1,213
Income before equity in earnings of unconsolidated real estate ventures and income tax expense		55,377			41,620
Equity in earnings of unconsolidated real estate ventures		2,650			2,419
Equity in earnings of unconsolidated real estate ventures—gain on sale of real estate assets and purchase of joint venture partners’ interests		2,857			—
Income tax expense		(2,248	)		(2,830	)
Net income		58,636			41,209
Net income allocated to Preferred Operating Partnership noncontrolling interests		(2,926	)		(2,492	)
Net income allocated to Operating Partnership and other noncontrolling interests		(1,968	)		(1,377	)
Net income attributable to common stockholders	$	53,742		$	37,340
Earnings per common share
Basic	$	0.46		$	0.32
Diluted	$	0.46		$	0.32
Weighted average number of shares
Basic		116,117,615			115,438,325
Diluted		122,595,718			121,062,845
Cash dividends paid per common share	$	0.47		$	0.40

See accompanying notes to unaudited condensed consolidated financial statements.

5

Extra Space Storage Inc.

Condensed Consolidated Statements of Comprehensive Income

(amounts in thousands)

(unaudited)

	For the Three Months Ended March 31,
	2015			2014
Net income	$	58,636		$	41,209
Other comprehensive loss:
Change in fair value of interest rate swaps		(6,593	)		(2,747	)
Total comprehensive income		52,043			38,462
Less: comprehensive income attributable to noncontrolling interests		4,617			3,750
Comprehensive income attributable to common stockholders	$	47,426		$	34,712

See accompanying notes to unaudited condensed consolidated financial statements.

6

Extra Space Storage Inc.

Condensed Consolidated Statement of Noncontrolling Interests and Equity

(amounts in thousands, except share data)

(unaudited)

	Noncontrolling Interests																	Extra Space Storage Inc. Stockholders’ Equity
	Preferred Operating Partnership
	Series A			Series B			Series C			Series D			Operating Partnership			Other		Shares			Par Value		Additional Paid-in Captial		Accumulated Other Comprehensive Income			Accumulated Deficit			Total Noncontrolling Interests and Equity
Balances at December 31, 2014	$	14,809		$	41,903		$	10,730		$	13,710		$	92,422		$	984		116,360,239		$	1,163	$	1,995,484	$	(1,484	)	$	(257,738	)	$	1,911,983
Issuance of common stock upon the exercise of options		—			—			—			—			—			—		41,634			—		970		—			—			970
Restricted stock grants issued		—			—			—			—			—			—		58,150			1		—		—			—			1
Restricted stock grants cancelled		—			—			—			—			—			—		(1,864	)		—		—		—			—			—
Compensation expense related to stock-based awards		—			—			—			—			—			—		—			—		1,142		—			—			1,142
Net income		1,668			629			458			171			1,966			2		—			—		—		—			53,742			58,636
Other comprehensive income		(46	)		—			—			—			(231	)		—		—			—		—		(6,316	)		—			(6,593	)
Tax effect from vesting of restricted stock grants and stock option exercises		—			—			—			—			—			—		—			—		644		—			—			644
Distributions to Operating Partnership units held by noncontrolling interests		(1,686	)		(629	)		(458	)		(171	)		(2,052	)		—		—			—		—		—			—			(4,996	)
Dividends paid on common stock at $0.47 per share		—			—			—			—			—			—		—			—		—		—			(54,732	)		(54,732	)
Balances at March 31, 2015	$	14,745		$	41,903		$	10,730		$	13,710		$	92,105		$	986		116,458,159		$	1,164	$	1,998,240	$	(7,800	)	$	(258,728	)	$	1,907,055

See accompanying notes to unaudited condensed consolidated financial statements.

7

Extra Space Storage Inc.

Condensed Consolidated Statements of Cash Flows

(amounts in thousands)

(unaudited)

	For the Three Months Ended March 31,
	2015			2014
Cash flows from operating activities:
Net income	$	58,636		$	41,209
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		30,428			28,375
Amortization of deferred financing costs		1,598			1,641
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes		697			662
Non-cash interest expense related to amortization of premium on notes payable		(747	)		(895	)
Compensation expense related to stock-based awards		1,142			1,121
Gain on sale of real estate assets and purchase of joint venture partners’ interests		(2,857	)		—
Distributions from unconsolidated real estate ventures in excess of earnings		2,601			1,024
Changes in operating assets and liabilities:
Receivables from related parties and affiliated real estate joint ventures		(2,367	)		(1,424	)
Other assets		(2,637	)		1,448
Accounts payable and accrued expenses		6,032			(7,715	)
Other liabilities		(5,087	)		(874	)
Net cash provided by operating activities		87,439			64,572
Cash flows from investing activities:
Acquisition of real estate assets		(77,082	)		(253,939	)
Development and redevelopment of real estate assets		(3,140	)		(2,820	)
Change in restricted cash		(10,105	)		1,425
Purchase of equipment and fixtures		(1,184	)		(1,274	)
Net cash used in investing activities		(91,511	)		(256,608	)
Cash flows from financing activities:
Proceeds from notes payable and lines of credit		290,768			291,157
Principal payments on notes payable and lines of credit		(228,878	)		(127,881	)
Deferred financing costs		(1,419	)		(1,392	)
Net proceeds from exercise of stock options		970			1,056
Dividends paid on common stock		(54,732	)		(46,347	)
Distributions to noncontrolling interests		(4,996	)		(4,265	)
Net cash provided by financing activities		1,713			112,328
Net decrease in cash and cash equivalents		(2,359	)		(79,708	)
Cash and cash equivalents, beginning of the period		47,663			126,723
Cash and cash equivalents, end of the period	$	45,304		$	47,015

See accompanying notes to unaudited condensed consolidated financial statements.

8

Extra Space Storage Inc.

Condensed Consolidated Statements of Cash Flows

(amounts in thousands)

(unaudited)

	For the Three Months Ended March 31,
	2015			2014
Supplemental schedule of cash flow information
Interest paid	$	21,754		$	16,445
Income taxes paid		661			1,244
Supplemental schedule of noncash investing and financing activities:
Tax effect from vesting of restricted stock grants and option exercises
Other assets	$	644		$	1,262
Paid-in capital		(644	)		(1,262	)
Acquisitions of real estate assets
Real estate assets, net	$	11,009		$	—
Receivables from related parties and affiliated real estate joint ventures		(11,009	)		—

See accompanying notes to unaudited condensed consolidated financial statements.

9

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited)

Amounts in thousands, except store and share data, unless otherwise stated

1. ORGANIZATION

Extra Space Storage Inc. (the “Company”) is a fully-integrated, self-administered and self-managed real estate investment trust (“REIT”), formed as a Maryland corporation on April 30, 2004, to own, operate, manage, acquire, develop and redevelop professionally managed self-storage properties (“stores”) located throughout the United States. The Company continues the business of Extra Space Storage LLC and its subsidiaries, which had engaged in the self-storage business since 1977. The Company’s interests in its stores is held through its operating partnership, Extra Space Storage LP (the “Operating Partnership”), which was formed on May 5, 2004. The Company’s primary assets are general partner and limited partner interests in the Operating Partnership. This structure is commonly referred to as an umbrella partnership REIT (“UPREIT”). The Company has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended. To the extent the Company continues to qualify as a REIT, it will not be subject to tax, with certain limited exceptions, on the taxable income that is distributed to its stockholders.

The Company invests in stores by acquiring wholly-owned stores or by acquiring an equity interest in real estate entities. At March 31, 2015, the Company had direct and indirect equity interests in 835 stores. In addition, the Company managed 271 stores for third parties, bringing the total number of stores which it owns and/or manages to 1,106. These stores are located in 35 states, Washington, D.C. and Puerto Rico.

The Company operates in three distinct segments: (1) rental operations; (2) tenant reinsurance; and (3) property management, acquisition and development. The rental operations activities include rental operations of stores in which we have an ownership interest. No single tenant accounts for more than 5.0% of rental income. Tenant reinsurance activities include the reinsurance of risks relating to the loss of goods stored by tenants in the Company’s stores. The Company’s property management, acquisition and development activities include managing, acquiring, developing and selling stores.

2. BASIS OF PRESENTATION

The accompanying unaudited condensed consolidated financial statements of the Company are presented on the accrual basis of accounting in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information, and in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they may not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (including normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three months ended March 31, 2015, are not necessarily indicative of results that may be expected for the year ending December 31, 2015. The condensed consolidated balance sheet as of December 31, 2014 has been derived from the Company’s audited financial statements as of that date, but does not include all of the information and footnotes required by GAAP for complete financial statements. For further information refer to the consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014, as filed with the Securities and Exchange Commission.

Reclassifications

Certain amounts in the Company’s 2014 consolidated financial statements and supporting note disclosures have been reclassified to conform to the current period presentation. Such reclassifications did not impact previously reported net income or accumulated deficit.

Recently Issued Accounting Standards

In April 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-08, “Presentation of Financial Statements (Topic 205) and Property, Plant and Equipment (Topic 360): Reporting Discontinued Operations and disclosures of Components of an Entity.” Under this guidance, only disposals representing a strategic shift in operations should be presented as discontinued operations. The guidance also requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. The Company adopted this guidance effective January 1, 2015. The Company has not previously had discontinued operations and as such, does not expect this guidance to have a significant impact on its consolidated financial statements.

10

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which amends the guidance for revenue recognition to replace numerous, industry-specific requirements and converges areas under this topic with those of the International Financial Reporting Standards. ASU 2014-09 outlines a five-step process for customer contract revenue recognition that focuses on transfer of control, as opposed to transfer of risk and rewards. The amendment also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. ASU 2014-09 is effective for reporting periods beginning after December 15, 2016, and early adoption is prohibited. Entities can transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. Management is currently assessing the impact of the adoption of ASU 2014-09 on the Company’s condensed consolidated financial statements.

In June 2014, the FASB issued ASU 2014-12, “Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period,” which requires a reporting entity to treat a performance target that affects vesting, and that could be achieved after the requisite service period, as a performance condition. ASU 2014-12 is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2015. Early adoption is permitted. ASU 2014-12 may be adopted either prospectively for share-based payment awards granted or modified on or after the effective date, or retrospectively, using a modified retrospective approach. The modified retrospective approach would apply to share-based payment awards outstanding as of the beginning of the earliest annual period presented in the financial statements on adoption, and to all new or modified awards thereafter. The Company does not expect the adoption of ASU 2014-12 to have a material impact on its consolidated financial statements.

In February 2015, the FASB issued ASU 2015-02, “Consolidation (Topic 810): Amendments to the Consolidation Analysis.” This guidance is effective for annual reporting periods beginning after December 15, 2015, including interim periods within that reporting period. ASU 2015-02 amends the criteria for determining if a service provider possesses a variable interest in a VIE, and eliminates the presumption that a general partner should consolidate a limited partnership. The Company does not expect the adoption of this standard to materially impact its consolidated financial statements.

In April 2015, the FASB issued ASU 2015-03, “Interest—Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs.” This guidance requires debt issuance costs related to a recognized debt liability to be presented as a direct deduction from the carrying amount of that debt liability. The new guidance will only impact financial statement presentation. The guidance is effective in the first quarter of 2016 and allows for early adoption. The Company does not expect the adoption of this standard to materially impact its consolidated financial statements.

3. FAIR VALUE DISCLOSURES

Derivative Financial Instruments

Currently, the Company uses interest rate swaps to manage its interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash payments and the discounted expected variable cash receipts. The variable cash receipts are based on an expectation of future interest rates (forward curves) derived from observable market interest rate forward curves.

The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts and guarantees. In conjunction with the Financial Accounting Standards Board’s fair value measurement guidance, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.

Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. However, as of March 31, 2015, the Company had assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and determined that the credit valuation adjustments were not significant to the overall valuation of its derivatives. As a result, the Company determined that its derivative valuations in their entirety were classified in Level 2 of the fair value hierarchy.

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The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis as of March 31, 2015, aggregated by the level in the fair value hierarchy within which those measurements fall.

	March 31, 2015			Fair Value Measurements at Reporting Date Using
Description				Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Other assets—Cash Flow Hedge Swap Agreements	$	688		$	—	$	688		$	—
Other liabilities—Cash Flow Hedge Swap Agreements	$	(7,231	)	$	—	$	(7,231	)	$	—

There were no transfers of assets and liabilities between Level 1 and Level 2 during the three months ended March 31, 2015. The Company did not have any significant assets or liabilities that are re-measured on a recurring basis using significant unobservable inputs as of March 31, 2015 or December 31, 2014.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

Long-lived assets held for use are evaluated for impairment when events or circumstances indicate there may be impairment. The Company reviews each store at least annually to determine if any such events or circumstances have occurred or exist. The Company focuses on stores where occupancy and/or rental income have decreased by a significant amount. For these stores, the Company determines whether the decrease is temporary or permanent, and whether the store will likely recover the lost occupancy and/or revenue in the short term. In addition, the Company carefully reviews stores in the lease-up stage and compares actual operating results to original projections.

When the Company determines that an event that may indicate impairment has occurred, the Company compares the carrying value of the related long-lived assets to the undiscounted future net operating cash flows attributable to the assets. An impairment loss is recorded if the net carrying value of the assets exceeds the undiscounted future net operating cash flows attributable to the assets. The impairment loss recognized equals the excess of net carrying value over the related fair value of the assets.

When real estate assets are identified by management as held for sale, the Company discontinues depreciating the assets and estimates the fair value of the assets, net of selling costs. If the estimated fair value, net of selling costs, of the assets that have been identified as held for sale is less than the net carrying value of the assets, a valuation allowance is established. The operations of assets held for sale or sold during the period are presented as part of normal operations for all periods presented.

The Company assesses whether there are any indicators that the value of the Company’s investments in unconsolidated real estate ventures may be impaired annually and when events or circumstances indicate that there may be impairment. An investment is impaired if management’s estimate of the fair value of the investment is less than its carrying value. To the extent impairment has occurred, and is considered to be other than temporary, the loss is measured as the excess of the carrying amount of the investment over the fair value of the investment.

In connection with the Company’s acquisition of stores, the purchase price is allocated to the tangible and intangible assets and liabilities acquired based on their fair values, which are estimated using significant unobservable inputs. The value of the tangible assets, consisting of land and buildings, is determined as if vacant. Intangible assets, which represent the value of existing tenant relationships, are recorded at their fair values based on the avoided cost to replace the current leases. The Company measures the value of tenant relationships based on the rent lost due to the amount of time required to replace existing customers, which is based on the Company’s historical experience with turnover in its stores. Debt assumed as part of an acquisition is recorded at fair value based on current interest rates compared to contractual rates. Acquisition-related transaction costs are expensed as incurred.

Fair Value of Financial Instruments

The carrying values of cash and cash equivalents, restricted cash, receivables, other financial instruments included in other assets, accounts payable and accrued expenses, variable-rate notes payable, lines of credit and other liabilities reflected in the condensed consolidated balance sheets at March 31, 2015 and December 31, 2014 approximate fair value.

The fair values of the Company’s notes receivable from Preferred Operating Partnership unit holders were based on the discounted estimated future cash flows of the notes (categorized within Level 3 of the fair value hierarchy); the discount rate used approximated the current market rate for loans with similar maturities and credit quality. The fair values of the Company’s fixed-rate notes payable

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and notes payable to trusts were estimated using the discounted estimated future cash payments to be made on such debt (categorized within Level 3 of the fair value hierarchy); the discount rates used approximated current market rates for loans, or groups of loans, with similar maturities and credit quality. The fair value of the Company’s exchangeable senior notes was estimated using an average market price for similar securities obtained from a third party.

The fair values of the Company’s fixed-rate assets and liabilities were as follows for the periods indicated:

	March 31, 2015				December 31, 2014
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	129,102	$	120,230	$	126,380	$	120,230
Fixed rate notes payable and notes payable to trusts	$	1,487,014	$	1,438,400	$	1,320,370	$	1,283,893
Exchangeable senior notes	$	310,625	$	250,000	$	276,095	$	250,000

4. EARNINGS PER COMMON SHARE

Basic earnings per common share is computed using the two-class method by dividing net income attributable to common stockholders by the weighted average number of common shares outstanding during the period. All outstanding unvested restricted stock awards contain rights to non-forfeitable dividends and participate in undistributed earnings with common stockholders; accordingly, they are considered participating securities that are included in the two-class method. Diluted earnings per common share measures the performance of the Company over the reporting period while giving effect to all potential common shares that were dilutive and outstanding during the period. The denominator includes the weighted average number of basic shares and the number of additional common shares that would have been outstanding if the potential common shares that were dilutive had been issued, and is calculated using either the two-class, treasury stock or as if-converted method, whichever is most dilutive. Potential common shares are securities (such as options, convertible debt, Series A Participating Redeemable Preferred Units (“Series A Units”), Series B Redeemable Preferred Units (“Series B Units”), Series C Convertible Redeemable Preferred Units (“Series C Units”), Series D Redeemable Preferred Units (“Series D Units”) and common Operating Partnership units (“OP Units”)) that do not have a current right to participate in earnings of the Company but could do so in the future by virtue of their option, redemption or conversion right.

In computing the dilutive effect of convertible securities, net income is adjusted to add back any changes in earnings in the period associated with the convertible security. The numerator also is adjusted for the effects of any other non-discretionary changes in income or loss that would result from the assumed conversion of those potential common shares. In computing diluted earnings per common share, only potential common shares that are dilutive (those that reduce earnings per common share) are included. For the three months ended March 31, 2015 and 2014, options to purchase approximately 19,762 and 18,100 shares of common stock, respectively, were excluded from the computation of earnings per share as their effect would have been anti-dilutive.

The following table presents the number of Preferred Operating Partnership units, and the potential common shares, that were excluded from the computation of earnings per share as their effect would have been anti-dilutive, assuming full conversion at the average share price for the quarter of $65.59.

	For the Three Months Ended March 31,
	2015				2014
	Number of Units		Equivalent Shares (if converted)		Number of Units		Equivalent Shares (if converted)
Series B Units		1,676,087		638,850		1,342,727		724,232
Series C Units		704,016		451,884		407,996		370,585
Series D Units		548,390		209,022		—		—
		2,928,493		1,299,756		1,750,723		1,094,817

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The Operating Partnership had $250,000 of its 2.375% Exchangeable Senior Notes due 2033 (the “Notes”) issued and outstanding as of March 31, 2015. The Notes could potentially have a dilutive impact on the Company’s earnings per share calculations. The Notes are exchangeable by holders into shares of the Company’s common stock under certain circumstances per the terms of the indenture governing the Notes. The exchange price of the Notes was $55.62 per share as of March 31, 2015, and could change over time as described in the indenture. The Company has irrevocably agreed to pay only cash for the accreted principal amount of the Notes relative to its exchange obligations, but retained the right to satisfy the exchange obligation in excess of the accreted principal amount in cash and/or common stock.

Though the Company has retained that right, Accounting Standards Codification (“ASC”) 260, “Earnings per Share,” requires an assumption that shares would be used to pay the exchange obligation in excess of the accreted principal amount, and requires that those shares be included in the Company’s calculation of weighted average common shares outstanding for the diluted earnings per share computation. For the three months ended March 31, 2015, 682,502 shares related to the Notes were included in the computation for diluted earnings per share. For the three months ended March 31, 2014, no shares related to the Notes were included in the computation for diluted earnings per share as the exchange price exceeded the per share price of the Company’s common stock during this period.

For the purposes of computing the diluted impact on earnings per share of the potential exchange of Series A Units for common shares upon redemption, where the Company has the option to redeem in cash or shares and where the Company has stated the positive intent and ability to settle at least $115,000 of the instrument in cash (or net settle a portion of the Series A Units against the related outstanding note receivable), only the amount of the instrument in excess of $115,000 is considered in the calculation of shares contingently issuable for the purposes of computing diluted earnings per share as allowed by ASC 260-10-45-46.

For the purposes of computing the diluted impact on earnings per share of the potential exchange of Series B Units for common shares upon redemption, where the Company has the option to redeem in cash or shares and where the Company has stated the intent and ability to settle the redemption in shares, the Company divided the total value of the Series B Units outstanding as of March 31, 2015 of $41,902 by the closing price of the Company’s common stock as of March 31, 2015 of $67.57 per share. Assuming full exchange for common shares as of March 31, 2015, 620,127 shares would have been issued to the holders of the Series B Units.

For the purposes of computing the diluted impact on earnings per share of the potential exchange of Series C Units for common shares upon redemption, where the Company has the option to redeem in cash or shares and where the Company has stated the intent and ability to settle the redemption in shares, the Company divided the total value of the Series C Units outstanding as of March 31, 2015 of $29,639 by the closing price of the Company’s common stock as of March 31, 2015 of $67.57 per share. Assuming full exchange for common shares as of March 31, 2015, 438,641 shares would have been issued to the holders of the Series C Units.

For the purposes of computing the diluted impact on earnings per share of the potential exchange of Series D Units for common shares upon redemption, where the Company has the option to redeem in cash or shares and where the Company has stated the intent and ability to settle the redemption in shares, the Company divided the total value of the Series D Units outstanding as of March 31, 2015 of $13,710 by the closing price of the Company’s common stock as of March 31, 2015 of $67.57 per share. Assuming full exchange for common shares as of March 31, 2015, 202,901 shares would have been issued to the holders of Series D Units.

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The computation of earnings per common share was as follows for the periods presented:

	For the Three Months Ended March 31,
	2015			2014
Net income attributable to common stockholders	$	53,742		$	37,340
Earnings and dividends allocated to participating securities		(119	)		(117	)
Earnings for basic computations		53,623			37,223
Earnings and dividends allocated to participating securities		119			—
Income allocated to noncontrolling interest—Preferred Operating Partnership (Series A Units) and Operating Partnership		3,635			3,128
Fixed component of income allocated to noncontrolling interest—Preferred Operating Partnership (Series A Units)		(1,274	)		(1,438	)
Net income for diluted computations	$	56,103		$	38,913
Weighted average common shares outstanding:
Average number of common shares outstanding—basic		116,117,615			115,438,325
Series A Units		875,480			989,980
OP Units		4,365,879			4,334,118
Unvested restricted stock awards included for treasury stock method		282,903			—
Shares related to exchangeable senior notes and dilutive stock options		953,841			300,422
Average number of common shares outstanding—diluted		122,595,718			121,062,845
Earnings per common share
Basic	$	0.46		$	0.32
Diluted	$	0.46		$	0.32

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5. STORE ACQUISITIONS

The following table summarizes the Company’s acquisitions of operating stores for the three months ended March 31, 2015, and does not include purchases of raw land or improvements made to existing assets:

	Number of Stores		Date of Acquisition		Consideration Paid														Acquisition Date Fair Value
Property Location					Total		Cash Paid		Non-cash gain		Notes Receivable		Previous equity interest			Net Liabilities/(Assets) Assumed			Land		Building		Intangible		Closing costs— expensed (1)
California (2)		1		3/30/2015	$	12,699	$	1,700	$	1,629	$	11,009	$	(1,264	)	$	(375	)	$	1,025	$	11,479	$	195	$	—
North Carolina, South Carolina		2		3/30/2015		13,165		13,143		—		—		—			22			1,763		11,229		144		29
Virginia		1		3/17/2015		5,073		5,065		—		—		—			8			118		4,797		81		77
Texas		1		2/24/2015		13,570		13,519		—		—		—			51			1,511		11,861		182		16
Texas		3		1/13/2015		41,904		41,806		—		—		—			98			12,080		29,489		300		35
2015 Totals		8			$	86,411	$	75,233	$	1,629	$	11,009	$	(1,264	)	$	(196	)	$	16,497	$	68,855	$	902	$	157

(1) This column represents costs paid at closing. The amounts shown exclude other acquisition costs paid before or after the closing date.

(2) This represents the acquisition of a joint venture partners’ interest in Extra Space of Sacramento One LLC (“Sacramento One”), an existing joint venture, for $1,700 in cash. The result of the acquisition is that the Company owns 100% of Sacramento One, which owned one store located in California. Prior to the acquisition date, the Company accounted for its interest in Sacramento One as an equity-method investment, and the Company also held mortgage notes receivable from Sacramento One totalling $11,009, including related interest. The total acquisition date fair value of the Company’s previous equity interest was approximately $365 and is included in consideration transfered. The Company recognized a non-cash gain of $1,629 as a result of remeasuring the fair value of its equity interest held prior to the acquisition. The store is consolidated subsequent to the acquisition as the Company owns 100% of the store.

6. VARIABLE INTERESTS

The Operating Partnership has three wholly-owned unconsolidated subsidiaries (“Trust,” “Trust II” and “Trust III,” together, the “Trusts”) that have issued trust preferred securities to third parties and common securities to the Operating Partnership. The proceeds from the sale of the preferred and common securities were loaned in the form of notes to the Operating Partnership. The Trusts are VIEs because the holders of the equity investment at risk (the trust preferred securities) do not have the power to direct the activities of the entities that most significantly affect the entities’ economic performance because of their lack of voting or similar rights. Because the Operating Partnership’s investment in the Trusts’ common securities was financed directly by the Trusts as a result of its loan of the proceeds to the Operating Partnership, that investment is not considered an equity investment at risk. The Operating Partnership’s investment in the Trusts is not a variable interest because equity interests are variable interests only to the extent that the investment is considered to be at risk, and therefore the Operating Partnership cannot be the primary beneficiary of the Trusts. Since the Company is not the primary beneficiary of the Trusts, they have not been consolidated. A debt obligation has been recorded in the form of notes for the proceeds as discussed above, which are owed to the Trusts. The Company has also included its investment in the Trusts’ common securities in other assets on the condensed consolidated balance sheets.

The Company has not provided financing or other support during the periods presented to the Trusts that it was not previously contractually obligated to provide. The Company’s maximum exposure to loss as a result of its involvement with the Trusts is equal to the total amount of the notes discussed above less the amounts of the Company’s investments in the Trusts’ common securities. The net amount is the notes payable that the Trusts owe to third parties for their investments in the Trusts’ preferred securities.

Following is a tabular comparison of the liabilities the Company has recorded as a result of its involvement with the Trusts to the maximum exposure to loss the Company is subject to as a result of such involvement as of March 31, 2015:

	Notes payable to Trusts		Investment Balance		Maximum exposure to loss		Difference
Trust	$	36,083	$	1,083	$	35,000	$	—
Trust II		42,269		1,269		41,000		—
Trust III		41,238		1,238		40,000		—
	$	119,590	$	3,590	$	116,000	$	—

The Company had no consolidated VIEs during the three months ended March 31, 2015.

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7. DERIVATIVES

The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity and credit risk, primarily by managing the amount, sources and duration of its debt funding and by using derivative financial instruments. Specifically, the Company enters into derivative financial instruments to manage exposure that arises from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s investments and borrowings.

Cash Flow Hedges of Interest Rate Risk

The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish these objectives, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in accumulated other comprehensive income (“OCI”) and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. A portion of these changes is excluded from accumulated other comprehensive income as it is allocated to noncontrolling interests. During the three months ended March 31, 2015 and 2014, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt.

The Company held 23 derivative financial instruments which had a total combined notional amount of $825,987 as of March 31, 2015.

Fair Values of Derivative Instruments

The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the condensed consolidated balance sheets:

	Asset (Liability) Derivatives
	March 31, 2015			December 31, 2014
Derivatives designated as hedging instruments:
Other assets	$	688		$	3,583
Other liabilities	$	(7,231	)	$	(3,533	)

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Effect of Derivative Instruments

The tables below present the effect of the Company’s derivative financial instruments on the condensed consolidated statements of operations for the periods presented. No tax effect has been presented as the derivative instruments are held by the Company:

	Classification of Income (Expense)	For the Three Months Ended March 31,
Type		2015			2014
Swap Agreements	Interest expense	$	(2,297	)	$	(2,293	)

	Gain (loss) recognized in OCI March 31,						Location of amounts reclassified from OCI into income	Gain (loss) reclassifed from OCI For the Three Months Ended March 31,
Type	2015			2014				2015			2014
Swap Agreements	$	(8,875	)	$	(5,043	)	Interest expense	$	(2,297	)	$	(2,293	)

Credit-risk-related Contingent Features

The Company has agreements with some of its derivative counterparties that contain provisions pursuant to which the Company could be declared in default of its derivative obligations if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender.

The Company also has an agreement with some of its derivative counterparties that incorporates the loan covenant provisions of the Company’s indebtedness with a lender affiliate of the derivative counterparty. Failure to comply with the loan covenant provisions would result in the Company being in default on any derivative instrument obligations covered by the agreement.

As of March 31, 2015, the Company had not posted any collateral related to these agreements. If the Company had breached any of these provisions as of March 31, 2015, it could have been required to settle its obligations under the agreements at their termination value of $7,740, including accrued interest.

8. EXCHANGEABLE SENIOR NOTES

On June 21, 2013, the Operating Partnership issued $250,000 of its 2.375% Exchangeable Senior Notes due 2033 at a 1.5% discount, or $3,750. Costs incurred to issue the Notes were approximately $1,672. These costs are being amortized as an adjustment to interest expense over five years, which represents the estimated term based on the first available redemption date, and are included in other assets in the condensed consolidated balance sheets. The Notes are general unsecured senior obligations of the Operating Partnership and are fully guaranteed by the Company. Interest is payable on January 1 and July 1 of each year beginning January 1, 2014, until the maturity date of July 1, 2033. The Notes bear interest at 2.375% per annum and contain an exchange settlement feature, which provides that the Notes may, under certain circumstances, be exchangeable for cash (for the principal amount of the Notes) and, with respect to any excess exchange value, for cash, shares of the Company’s common stock, or a combination of cash and shares of the Company’s common stock, at the Company’s option. The exchange rate of the Notes as of March 31, 2015 was approximately 17.98 shares of the Company’s common stock per $1,000 principal amount of the Notes.

The Operating Partnership may redeem the Notes at any time to preserve the Company’s status as a REIT. In addition, on or after July 5, 2018, the Operating Partnership may redeem the Notes for cash, in whole or in part, at 100% of the principal amount plus accrued and unpaid interest, upon at least 30 days but not more than 60 days prior written notice to the holders of the Notes. The holders of the Notes have the right to require the Operating Partnership to repurchase the Notes for cash, in whole or in part, on July 1 of the years 2018, 2023 and 2028, and upon the occurrence of certain designated events, in each case for a repurchase price equal to 100% of the principal amount of the Notes plus accrued and unpaid interest. Certain events are considered “Events of Default,” as defined in the indenture governing the Notes, which may result in the accelerated maturity of the Notes.

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GAAP requires entities with convertible debt instruments that may be settled entirely or partially in cash upon conversion to separately account for the liability and equity components of the instrument in a manner that reflects the issuer’s economic interest cost. The Company therefore accounts for the liability and equity components of the Notes separately. The equity component is included in additional paid-in capital in stockholders’ equity in the condensed consolidated balance sheets, and the value of the equity component is treated as original issue discount for purposes of accounting for the debt component. The discount is being amortized as interest expense over the remaining period of the debt through its first redemption date, July 1, 2018. The effective interest rate on the liability component is 4.0%.

Information about the carrying amount of the equity component, the principal amount of the liability component, its unamortized discount and its net carrying amount was as follows for the periods indicated:

	March 31, 2015			December 31, 2014
Carrying amount of equity component	$	14,496		$	14,496
Principal amount of liability component	$	250,000		$	250,000
Unamortized discount—equity component		(9,751	)		(10,448	)
Unamortized cash discount		(2,418	)		(2,606	)
Net carrying amount of liability component	$	237,831		$	236,946

The amount of interest cost recognized relating to the contractual interest rate and the amortization of the discount on the liability component of the Notes were as follows for the periods indicated:

	For the Three Months Ended March 31,
	2015		2014
Contractual interest	$	1,484	$	1,484
Amortization of discount		697		662
Total interest expense recognized	$	2,181	$	2,146

9. NONCONTROLLING INTEREST REPRESENTED BY PREFERRED OPERATING PARTNERSHIP UNITS

Classification of Noncontrolling Interests

GAAP requires a company to present ownership interests in subsidiaries held by parties other than the company in the consolidated financial statements within the equity section, but separate from the company’s equity. It also requires the amount of consolidated net income attributable to the parent and to the noncontrolling interest to be clearly identified and presented on the face of the consolidated statement of operations and requires changes in ownership interest to be accounted for similarly as equity transactions. If noncontrolling interests are determined to be redeemable, they are to be carried at their redemption value as of the balance sheet date and reported as temporary equity.

The Company has evaluated the terms of the Operating Partnership’s preferred units and classifies the noncontrolling interest represented by such preferred units as stockholders’ equity in the accompanying condensed consolidated balance sheets. The Company will periodically evaluate individual noncontrolling interests for the ability to continue to recognize the noncontrolling interest as permanent equity in the condensed consolidated balance sheets. Any noncontrolling interests that fail to qualify as permanent equity will be reclassified as temporary equity and adjusted to the greater of (1) the carrying amount and (2) the redemption value as of the end of the period in which the determination is made.

Series A Participating Redeemable Preferred Units

On June 15, 2007, the Operating Partnership entered into a Contribution Agreement with various limited partnerships affiliated with AAAAA Rent-A-Space to acquire ten stores in exchange for 989,980 Series A Units of the Operating Partnership. The stores are located in California and Hawaii.

On June 25, 2007, the Operating Partnership loaned the holders of the Series A Units $100,000. The note receivable bears interest at 4.85% per annum. During 2013, a loan amendment was signed extending the maturity date to September 1, 2020. The loan is secured by the borrower’s Series A Units. The holders of the Series A Units could redeem up to 114,500 Series A Units prior to the maturity date of the loan. If any redemption in excess of 114,500 Series A Units occurs prior to the maturity date, the holder of the Series A Units is required to repay the loan as of the date of that redemption.

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The partnership agreement of the Operating Partnership (as amended, the “Partnership Agreement”) provides for the designation and issuance of the Series A Units. The Series A Units will have priority over all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

Under the Partnership Agreement, Series A Units in the amount of $115,000 bear a fixed priority return of 5% and have a fixed liquidation value of $115,000. The remaining balance participates in distributions with, and has a liquidation value equal to, that of the OP Units. The Series A Units are redeemable at the option of the holder, which redemption obligation may be satisfied, at the Company’s option, in cash or shares of its common stock.

On October 3, 2014, the holders of the Series A Units redeemed 114,500 Series A Units for $4,794 in cash and 280,331 shares of common stock. No additional redemption of Series A Units can be made without repayment of the loan. Subsequent to this redemption, the fixed priority return is calculated using the current liquidation value of $101,699. The Series A Units are shown on the balance sheet net of the $100,000 loan because the borrower under the loan receivable is also the holder of the Series A Units.

Series B Redeemable Preferred Units

On April 3, 2014, the Operating Partnership completed the purchase of a store located in Georgia. This store was acquired in exchange for $15,158 of cash and 333,360 Series B Units valued at $8,334.

On August 29, 2013, the Operating Partnership completed the purchase of 19 out of 20 stores affiliated with All Aboard Mini Storage, all of which are located in California. On September 26, 2013, the Operating Partnership completed the purchase of the remaining store. These stores were acquired in exchange for $100,876 of cash (including $98,960 of debt assumed and immediately defeased at closing), 1,342,727 Series B Units valued at $33,568, and 1,448,108 OP Units valued at $62,341.

The Partnership Agreement provides for the designation and issuance of the Series B Units. The Series B Units rank junior to the Series A Units, on parity with the Series C Units, and senior to all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

The outstanding Series B Units have a liquidation value of $25.00 per unit for a fixed liquidation value of $41,902. Holders of the Series B Units receive distributions at an annual rate of 6%. These distributions are cumulative. The Series B Units will become redeemable at the option of the holder on the first anniversary of the date of issuance, which redemption obligation may be satisfied at the Company’s option in cash or shares of its common stock.

Series C Convertible Redeemable Preferred Units

On November 19, 2013, the Company entered into Contribution Agreements with various entities affiliated with Grupe Properties Co. Inc. (“Grupe”), under which the Company agreed to acquire twelve stores, all of which are located in California. The Company completed the purchase of these stores between December 2013 and May 2014. The Company previously held 35% interests in five of these stores and a 40% interest in one store through six separate joint ventures with Grupe. These stores were acquired in exchange for a total of approximately $45,722 of cash, the assumption of $37,532 in existing debt, and the issuance of 704,016 Series C Units valued at $30,960.

The Partnership Agreement provides for the designation and issuance of the Series C Units. The Series C Units rank junior to the Series A Units, on parity with the Series B Units, and senior to all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

The outstanding Series C Units have a liquidation value of $42.10 per unit for a fixed liquidation value of $29,639. From issuance to the fifth anniversary of issuance, each Series C Unit holder will receive quarterly distributions equal to the quarterly distribution per OP Unit plus $0.18. Beginning on the fifth anniversary of issuance, each Series C Unit holder will receive a fixed quarterly distribution equal to the aggregate quarterly distribution payable in respect of such Series C Unit during the four quarters immediately preceding the fifth anniversary of issuance, divided by four. These distributions are cumulative. The Series C Units will become redeemable at the option of the holder one year from the date of issuance, which redemption obligation may be satisfied at the

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Company’s option in cash or shares of its common stock. The Series C Units will also become convertible into OP Units at the option of the holder one year from the date of issuance, at a rate of 0.9145 OP Units per Series C Unit converted. This conversion option expires upon the fifth anniversary of the date of issuance.

In December 2014, the Operating Partnership loaned certain holders of the Series C Units $20,230. The notes receivable, which are collateralized by the Series C Units, bear interest at 5.0% per annum and mature on December 15, 2024. The Series C Units are shown on the balance sheet net of the $20,230 loan because the borrower under the loan receivable is also the holder of the Series C units.

Series D Redeemable Preferred Units

In December 2014, the Operating Partnership completed the acquisition of a store located in Florida. This store was acquired in exchange for $5,621 in cash and 548,390 Series D Units valued at $13,710.

The Partnership Agreement provides for the designation and issuance of the Series D Units. The Series D Units rank junior to the Series A Units, on parity with the Series B Units and Series C Units, and senior to all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

The Series D Units have a liquidation value of $25.00 per unit, for a fixed liquidation value of $13,710. Holders of the Series D Units receive distributions at an annual rate of 5.0%. These distributions are cumulative. The Series D Units will become redeemable at the option of the holder on the first anniversary of the date of issuance, which redemption obligation may be satisfied at the Company’s option in cash or shares of its common stock.

10. NONCONTROLLING INTEREST IN OPERATING PARTNERSHIP

The Company’s interest in its stores is held through the Operating Partnership. ESS Holding Business Trust I, a wholly-owned subsidiary of the Company, is the sole general partner of the Operating Partnership. ESS Holding Business Trust II, also a wholly-owned subsidiary of the Company, is a limited partner of the Operating Partnership. Between its general partner and limited partner interests, the Company held a 93.4% ownership interest in the Operating Partnership as of March 31, 2015. The remaining ownership interests in the Operating Partnership (including Preferred Operating Partnership units) of 6.6% are held by certain former owners of assets acquired by the Operating Partnership.

The noncontrolling interest in the Operating Partnership represents OP Units that are not owned by the Company. In conjunction with the formation of the Company, and as a result of subsequent acquisitions, certain persons and entities contributing interests in stores to the Operating Partnership received limited partnership interests in the form of OP Units. Limited partners who received OP Units in the formation transactions or in exchange for contributions for interests in stores have the right to require the Operating Partnership to redeem part or all of their OP Units for cash based upon the fair market value of an equivalent number of shares of the Company’s common stock (based on the ten-day average trading price) at the time of the redemption. Alternatively, the Company may, in its sole discretion, elect to acquire those OP Units in exchange for shares of its common stock on a one-for-one basis, subject to anti-dilution adjustments provided in the Partnership Agreement. The ten-day average closing stock price at March 31, 2015 was $67.76 and there were 4,365,879 OP Units outstanding. Assuming that all of the OP Unit holders exercised their right to redeem all of their OP Units on March 31, 2015 and the Company elected to pay the OP Unit holders cash, the Company would have paid $295,832 in cash consideration to redeem the units.

GAAP requires a company to present ownership interests in subsidiaries held by parties other than the company in the consolidated financial statements within the equity section, but separate from the company’s equity. It also requires the amount of consolidated net income attributable to the parent and to the noncontrolling interest to be clearly identified and presented on the face of the consolidated statement of operations, and requires changes in ownership interest to be accounted for similarly as equity transactions. If noncontrolling interests are determined to be redeemable, they are to be carried at their redemption value as of the balance sheet date and reported as temporary equity.

The Company has evaluated the terms of the OP Units and classifies the noncontrolling interest represented by the OP Units as stockholders’ equity in the accompanying condensed consolidated balance sheets. The Company will periodically evaluate individual noncontrolling interests for the ability to continue to recognize the noncontrolling amount as permanent equity in the condensed consolidated balance sheets. Any noncontrolling interests that fail to qualify as permanent equity will be reclassified as temporary equity and adjusted to the greater of (1) the carrying amount and (2) the redemption value as of the end of the period in which the determination is made.

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11. OTHER NONCONTROLLING INTERESTS

Other noncontrolling interests represent the ownership interests of various third parties in two consolidated joint ventures as of March 31, 2015. One of these consolidated joint ventures owns a single store in California. The second consolidated joint venture owns 19 stores. The ownership interests of the third-party owners range from 1.0% to 3.3%. Other noncontrolling interests are included in the stockholders’ equity section of the Company’s condensed consolidated balance sheets. The income or losses attributable to these third-party owners based on their ownership percentages are reflected in net income allocated to Operating Partnership and other noncontrolling interests in the condensed consolidated statements of operations.

12. EQUITY IN EARNINGS OF UNCONSOLIDATED REAL ESTATE VENTURES—GAIN ON SALE OF REAL ESTATE AND PURCHASE OF JOINT VENTURE PARTNERS’ INTERESTS

In March 2015, ESS PRISA II LLC (“PRISA II”), a joint venture in which the Company holds a 2.0% interest, sold one store located in New York for $90,000. As a result of the sale, PRISA II recognized a gain of $60,496 and the Company recorded its 2.0% portion of the gain, or $1,228.

In March 2015, the Company acquired its joint venture partner’s 82.4% interest in Sacramento One, an existing joint venture which owned one store located in California, for $1,700. In addition, the Company held mortgage notes receivable from Sacramento One totaling $11,009, which were eliminated as a result of the acquisition. Prior to the acquisition, the remaining 17.6% interest was owned by the Company, which accounted for its investment in Sacramento One using the equity method. The Company recorded a non-cash gain of $1,629 related to this transaction, which represents the increase in fair value of the company’s interest in the joint venture from its formation to the acquisition date.

13. SEGMENT INFORMATION

The Company operates in three distinct segments: (1) rental operations; (2) tenant reinsurance; and (3) property management, acquisition and development. Management fees collected for wholly-owned stores are eliminated in consolidation. Financial information for the Company’s business segments is presented below:

	March 31, 2015		December 31, 2014
Balance Sheet
Investment in unconsolidated real estate ventures
Rental operations	$	85,602	$	85,711
Total assets
Rental operations	$	4,194,744	$	4,109,673
Tenant reinsurance		38,745		39,383
Property management, acquisition and development		230,656		253,051
	$	4,464,145	$	4,402,107

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	For the Three Months Ended March 31,
	2015			2014
Statement of Operations
Total revenues
Rental operations	$	148,894		$	132,001
Tenant reinsurance		16,510			13,463
Property management, acquisition and development		7,750			7,123
		173,154			152,587
Operating expenses, including depreciation and amortization
Rental operations		75,509			69,942
Tenant reinsurance		2,928			2,567
Property management, acquisition and development		19,281			19,680
		97,718			92,189
Income (loss) from operations
Rental operations		73,385			62,059
Tenant reinsurance		13,582			10,896
Property management, acquisition and development		(11,531	)		(12,557	)
		75,436			60,398
Interest expense
Rental operations		(21,830	)		(19,310	)
Property management, acquisition and development		399			(288	)
		(21,431	)		(19,598	)
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes
Property management, acquisition and development		(697	)		(662	)
Interest income
Tenant reinsurance		4			4
Property management, acquisition and development		852			265
		856			269
Interest income on note receivable from Preferred Operating Partnership unit holder
Property management, acquisition and development		1,213			1,213
Equity in earnings of unconsolidated real estate ventures
Rental operations		2,650			2,419
Equity in earnings of unconsolidated real estate ventures—gain on sale of real estate assets and purchase of partners’ interests
Rental operations		2,857			—
Income tax expense
Rental operations		(754	)		(434	)
Tenant reinsurance		(1,874	)		(3,815	)
Property management, acquisition and development		380			1,419
		(2,248	)		(2,830	)
Net income (loss)
Rental operations		56,308			44,734
Tenant reinsurance		11,712			7,085
Property management, acquisition and development		(9,384	)		(10,610	)
	$	58,636		$	41,209
Depreciation and amortization expense
Rental operations	$	28,265		$	26,460
Property management, acquisition and development		2,163			1,915
	$	30,428		$	28,375
Statement of Cash Flows
Acquisition of real estate assets
Property management, acquisition and development	$	(77,082	)	$	(253,939	)
Development and redevelopment of real estate assets
Property management, acquisition and development	$	(3,140	)	$	(2,820	)

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14. COMMITMENTS AND CONTINGENCIES

As of March 31, 2015, the Company is involved in various legal proceedings and is subject to various claims and complaints arising in the ordinary course of business. In the opinion of management, such litigation, claims and complaints are not expected to have a material adverse effect on the Company’s financial condition or results of operations.

As of March 31, 2015, the Company was under contract to acquire 42 stores for a total purchase price of $374,283. Of these 42 stores, 34 are scheduled to close in 2015. The remaining stores will close upon completion of construction, expected to occur on various dates in 2016 and 2017.

15. SUBSEQUENT EVENTS

On April 14, 2015, the Company purchased one store located in Texas for $8,650.

On April 15, 2015, the Company purchased a portfolio of 22 stores located in Arizona and Texas for $177,700.

On April 24, 2015, the Company purchased one store located in Georgia for $6,500.

On May 5, 2015 the Company purchased one store located in North Carolina for $11,000.

On May 7, 2015 the Company purchased another store located in Georgia for $6,500.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Amounts in thousands, except store and share data

CAUTIONARY LANGUAGE

The following discussion and analysis should be read in conjunction with our unaudited “Condensed Consolidated Financial Statements” and the “Notes to Condensed Consolidated Financial Statements (unaudited)” appearing elsewhere in this report and the “Consolidated Financial Statements,” “Notes to Consolidated Financial Statements” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained in our Form 10-K for the year ended December 31, 2014. We make statements in this section that are forward-looking statements within the meaning of the federal securities laws. For a complete discussion of forward-looking statements, see the section in this Form 10-Q entitled “Statement on Forward-Looking Information.”

CRITICAL ACCOUNTING POLICIES

Our discussion and analysis of our financial condition and results of operations are based on our unaudited condensed consolidated financial statements contained elsewhere in this report, which have been prepared in accordance with GAAP. Our notes to the unaudited condensed consolidated financial statements contained elsewhere in this report and the audited financial statements contained in our Form 10-K for the year ended December 31, 2014 describe the significant accounting policies essential to our unaudited condensed consolidated financial statements. Preparation of our financial statements requires estimates, judgments and assumptions. We believe that the estimates, judgments and assumptions that we have used are appropriate and correct based on information available at the time they were made. These estimates, judgments and assumptions can affect our reported assets and liabilities as of the date of the financial statements, as well as the reported revenues and expenses during the period presented. If there are material differences between these estimates, judgments and assumptions and actual facts, our financial statements may be affected.

In many cases, the accounting treatment of a particular transaction is specifically dictated by GAAP and does not require our judgment in its application. There are areas in which our judgment in selecting among available alternatives would not produce a materially different result, but there are some areas in which our judgment in selecting among available alternatives would produce a materially different result. See the notes to the unaudited condensed consolidated financial statements that contain additional information regarding our accounting policies and other disclosures.

OVERVIEW

We are a fully integrated, self-administered and self-managed REIT, formed to continue the business commenced in 1977 by Extra Space Storage LLC and its subsidiaries to own, operate, manage, acquire, develop and redevelop professionally managed self-storage stores.

We derive substantially all of our revenues from rents received from tenants under leases at each of our wholly-owned stores; from management fees on the stores we manage for joint venture partners and unaffiliated third parties; and from our tenant reinsurance program. Our management fee is equal to approximately 6% of cash collected from the managed stores. We also receive an asset management fee of 0.5% of the total asset value from one of our joint ventures.

We operate in competitive markets, often where consumers have multiple stores from which to choose. Competition has impacted, and will continue to impact, our store results. We experience seasonal fluctuations in occupancy levels, with occupancy levels generally higher in the summer months due to increased moving activity. Our operating results depend materially on our ability to lease available self-storage units and actively manage rental rates, and on the ability of our tenants to make required rental payments. We believe that we are able to respond quickly and effectively to changes in local, regional and national economic conditions by centrally adjusting rental rates through the combination of our revenue management team and our industry-leading technology systems.

We continue to evaluate a range of new initiatives and opportunities in order to enable us to maximize stockholder value. Our strategies to maximize stockholder value include the following:

• Maximize the performance of our stores through strategic, efficient and proactive management. We pursue revenue-generating and expense-minimizing opportunities in our operations. Our revenue management team seeks to maximize revenue by responding to changing market conditions through our advanced technology system’s ability to provide real-time, interactive rental rate and discount management. Our size allows us greater ability than the majority of our competitors to implement more effective online marketing programs, which we believe will attract more customers to our stores at a lower net cost.

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• Acquire self-storage stores. Our acquisitions team continues to pursue the acquisition of multi-store portfolios and single stores that we believe can provide stockholder value. We have established a reputation as a reliable, ethical buyer, which we believe enhances our ability to negotiate and close acquisitions. In addition, we believe our status as an UPREIT enables flexibility when structuring deals. We continue to see available acquisitions on which to bid and are seeing increasing prices. However, we remain a disciplined buyer and look for acquisitions that will strengthen our portfolio and increase stockholder value.

• Expand our management business. Our management business enables us to generate increased revenues through management fees and to expand our geographic footprint. We believe this expanded footprint enables us to reduce our operating costs through economies of scale. In addition, we see our management business as a future acquisition pipeline. We pursue strategic relationships with owners whose stores would enhance our portfolio in the event an opportunity arises to acquire such stores.

PROPERTIES

As of March 31, 2015, we owned, had ownership interests in, or managed 1,106 stores in 35 states, Washington, D.C. and Puerto Rico. Of these 1,106 stores, we owned 565 stores, we held joint venture interests in 270 stores, and our taxable REIT subsidiary, Extra Space Management, Inc., operated an additional 271 stores that are owned by third parties. These operating stores contain approximately 81.8 million square feet of rentable space in approximately 740,000 units.

Our stores are generally situated in convenient, highly visible locations clustered around large population centers such as Atlanta, Baltimore/Washington, D.C., Boston, Chicago, Dallas, Houston, Las Vegas, Los Angeles, Miami, New York City, Orlando, Philadelphia, Phoenix, St. Petersburg/Tampa and San Francisco/Oakland. These areas all enjoy above-average population growth and income levels. The clustering of assets around these population centers enables us to reduce our operating costs through economies of scale. Our acquisitions and management business have given us an increased scale in many core markets as well as a foothold in many markets where we had no previous presence.

We consider a store to be in the lease-up stage after it has been issued a certificate of occupancy, but before it has achieved stabilization. We consider a store to be stabilized once it has achieved either an 80% average occupancy rate for a full year measured as of January 1, or has been open for three years.

As of March 31, 2015, approximately 670,000 tenants were leasing storage units at the 1,106 operating stores that we own and/or manage, primarily on a month-to-month basis, providing the flexibility to increase rental rates over time as market conditions permit. Existing tenants generally receive rate increases at least annually, for which no direct correlation has been drawn to our vacancy trends. Although leases are short-term in duration, the typical tenant tends to remain at our stores for an extended period of time. For stores that were stabilized as of March 31, 2015, the average length of stay was approximately 13.4 months for tenants that vacated during the preceding twelve month period.

The average annual rent per square foot for our existing customers at stabilized stores, net of discounts and bad debt, was $14.18 for the three months ended March 31, 2015, compared to $13.62 for the same period ended March 31, 2014. Average annual rent per square foot for new leases was $14.56 for the three months ended March 31, 2015, compared to $13.82 for the same period ended March 31, 2014. The average discounts, as a percentage of rental revenues, during these periods were 3.9% and 4.1%, respectively.

Our store portfolio is made up of different types of construction and building configurations depending on the site and the municipality where it is located. Most often sites are what we consider “hybrid” stores, a mix of drive-up and multi-floor buildings. We have a number of multi-floor buildings with elevator access only, and a number of stores featuring ground-floor access only.

The following table presents additional information regarding the occupancy of our stabilized stores by state as of March 31, 2015 and 2014. The information as of March 31, 2014 is on a pro forma basis as though all the stores owned and/or managed at March 31, 2015 were under our control as of March 31, 2014.

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Stabilized Store Data Based on Location

	Number of Stores		Company		Pro forma		Company		Pro forma		Company			Pro forma
Location			Number of Units as of March 31, 2015 (1)		Number of Units as of March 31, 2014		Net Rentable Square Feet as of March 31, 2015 (2)		Net Rentable Square Feet as of March 31, 2014		Square Foot Occupancy % March 31, 2015			Square Foot Occupancy % March 31, 2014
Wholly-Owned Stores
Alabama		5		2,913		2,893		343,516		343,905		88.2	%		83.0	%
Arizona		12		7,666		7,549		889,838		886,003		92.8	%		87.1	%
California		122		91,341		90,581		9,454,957		9,466,712		93.8	%		89.4	%
Colorado		12		5,934		5,820		739,109		736,780		94.2	%		91.9	%
Connecticut		5		3,133		3,126		299,429		300,310		93.9	%		90.1	%
Florida		57		39,416		39,258		4,214,245		4,242,311		92.6	%		89.7	%
Georgia		22		12,977		12,968		1,634,310		1,634,502		90.9	%		86.6	%
Hawaii		5		5,654		5,566		337,637		333,809		93.5	%		86.4	%
Illinois		17		11,935		11,593		1,233,925		1,219,671		90.1	%		91.1	%
Indiana		9		4,765		4,711		555,310		553,558		90.8	%		89.2	%
Kansas		1		507		503		50,361		50,360		88.9	%		93.0	%
Kentucky		4		2,181		2,157		253,741		254,141		91.1	%		90.5	%
Louisiana		2		1,408		1,411		149,990		150,165		91.9	%		90.9	%
Maryland		23		17,373		17,251		1,817,835		1,818,053		91.9	%		90.8	%
Massachusetts		36		22,218		22,023		2,246,607		2,247,053		93.3	%		90.8	%
Michigan		3		1,805		1,791		255,697		251,432		91.3	%		90.5	%
Missouri		6		3,241		3,214		387,551		385,176		89.9	%		89.7	%
Nevada		5		3,190		3,202		549,080		547,154		92.9	%		86.4	%
New Hampshire		2		1,015		1,012		125,748		125,748		96.0	%		92.8	%
New Jersey		49		37,982		37,777		3,686,908		3,678,498		92.9	%		92.7	%
New Mexico		3		1,584		1,571		217,954		217,444		89.1	%		83.8	%
New York		20		17,633		17,621		1,460,818		1,457,940		92.1	%		89.7	%
North Carolina		7		4,851		4,783		510,771		504,170		91.9	%		84.0	%
Ohio		19		10,432		10,273		1,363,811		1,358,325		91.6	%		89.6	%
Oregon		3		2,155		2,148		250,450		250,530		94.4	%		92.3	%
Pennsylvania		9		5,759		5,726		651,576		649,100		91.7	%		89.3	%
Rhode Island		2		1,212		1,183		131,141		131,346		94.5	%		90.1	%
South Carolina		6		3,355		3,322		420,790		418,490		88.9	%		91.7	%
Tennessee		10		5,595		5,513		755,123		753,357		93.9	%		91.5	%
Texas		33		21,597		21,466		2,535,810		2,514,857		90.5	%		87.6	%
Utah		8		4,240		4,053		523,056		503,791		92.5	%		90.9	%
Virginia		29		22,421		22,379		2,402,203		2,383,793		88.3	%		84.9	%
Washington		6		3,589		3,545		428,603		427,773		90.2	%		89.1	%
Total Wholly-Owned Stabilized		552		381,077		377,989		40,877,900		40,796,257		92.2	%		89.4	%

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	Number of Stores		Company		Pro forma		Company		Pro forma		Company			Pro forma
Location			Number of Units as of March 31, 2015 (1)		Number of Units as of March 31, 2014		Net Rentable Square Feet as of March 31, 2015 (2)		Net Rentable Square Feet as of March 31, 2014		Square Foot Occupancy % March 31, 2015			Square Foot Occupancy % March 31, 2014
Joint-Venture Stores
Alabama		2		1,156		1,149		145,146		145,231		90.2	%		92.2	%
Arizona		7		4,263		4,224		492,603		493,071		92.3	%		90.8	%
California		70		50,593		50,216		5,183,638		5,173,895		94.4	%		91.8	%
Colorado		2		1,322		1,323		159,454		159,443		92.9	%		90.6	%
Connecticut		7		5,316		5,297		611,840		611,790		93.3	%		92.2	%
Delaware		1		592		590		71,705		71,705		93.1	%		89.3	%
Florida		19		15,278		15,198		1,534,938		1,533,311		92.0	%		90.0	%
Georgia		2		1,069		1,059		152,554		151,524		89.4	%		84.8	%
Illinois		5		3,477		3,447		365,165		364,916		91.5	%		92.7	%
Indiana		5		2,214		2,170		287,973		285,386		91.5	%		89.8	%
Kansas		2		842		840		109,195		109,695		91.6	%		85.6	%
Kentucky		4		2,276		2,237		257,439		255,089		89.2	%		86.7	%
Maryland		12		9,816		9,743		954,965		954,725		90.7	%		89.8	%
Massachusetts		13		6,947		6,903		783,629		782,680		91.9	%		91.5	%
Michigan		8		4,830		4,787		614,292		610,718		93.9	%		91.3	%
Missouri		1		535		532		61,075		61,225		86.9	%		85.7	%
Nevada		5		3,030		3,047		327,778		326,863		88.5	%		87.0	%
New Hampshire		2		795		776		84,631		83,615		92.7	%		91.9	%
New Jersey		16		13,004		12,950		1,357,516		1,356,727		90.4	%		90.6	%
New Mexico		7		3,606		3,604		397,044		398,245		91.9	%		83.8	%
New York		12		11,931		11,939		975,514		977,856		92.4	%		91.3	%
Ohio		8		3,998		3,963		531,697		531,412		89.9	%		89.6	%
Oregon		1		654		653		64,970		64,970		92.6	%		92.5	%
Pennsylvania		10		7,981		7,964		805,223		803,620		91.0	%		89.6	%
Tennessee		17		9,458		9,373		1,241,902		1,241,427		92.0	%		90.7	%
Texas		17		10,627		10,561		1,389,061		1,387,664		93.7	%		92.2	%
Virginia		13		9,385		9,361		994,769		994,449		91.7	%		90.5	%
Washington, DC		1		1,547		1,530		102,492		102,017		91.9	%		91.8	%
Total Joint-Venture Stabilized		269		186,542		185,436		20,058,208		20,033,269		92.4	%		90.7	%
Managed Stores
Alabama		7		2,339		2,339		355,310		355,310		87.3	%		87.3	%
Arizona		3		1,223		1,219		229,967		228,847		92.4	%		85.8	%
California		61		40,929		41,259		5,364,399		5,414,868		89.6	%		80.7	%
Colorado		16		8,365		8,333		1,068,607		1,063,669		92.1	%		91.1	%
Connecticut		1		465		473		61,865		61,600		91.1	%		87.9	%
Florida		36		23,255		23,249		2,811,985		2,850,187		89.6	%		85.0	%
Georgia		11		5,873		5,865		912,964		911,788		90.1	%		85.4	%
Hawaii		6		5,016		5,038		350,372		344,898		89.1	%		87.3	%
Illinois		6		3,612		3,593		393,710		387,345		87.9	%		89.2	%
Indiana		9		5,047		5,034		618,777		618,777		90.6	%		87.9	%
Kentucky		1		552		547		67,268		67,268		98.2	%		84.9	%
Louisiana		1		999		1,005		133,490		134,835		88.3	%		80.5	%
Maryland		14		9,509		9,495		913,327		914,272		88.6	%		85.1	%
Mississippi		2		1,885		1,893		281,558		281,823		89.7	%		82.8	%
Missouri		2		1,119		1,209		127,501		152,141		90.5	%		89.4	%
Nevada		4		3,016		3,050		316,760		315,985		83.0	%		75.8	%
New Jersey		3		1,638		1,619		181,588		181,138		91.7	%		92.6	%
New Mexico		2		1,125		1,120		131,112		131,312		91.5	%		88.6	%
North Carolina		3		1,603		1,571		205,218		205,981		94.2	%		88.6	%
Ohio		8		2,842		2,833		396,676		396,504		92.1	%		89.3	%
Pennsylvania		15		6,950		6,944		859,682		861,372		91.1	%		86.9	%
South Carolina		2		1,171		1,198		153,723		153,723		83.3	%		84.8	%
Tennessee		4		1,978		1,971		278,446		280,471		89.6	%		89.4	%
Texas		24		13,111		12,891		1,775,321		1,737,067		85.6	%		82.9	%
Utah		4		2,021		2,031		314,040		313,715		91.4	%		88.2	%
Virginia		4		2,405		2,404		249,514		249,514		88.0	%		86.3	%
Washington, DC		2		1,267		1,263		112,334		112,409		90.7	%		89.2	%
Puerto Rico		4		2,666		2,694		287,049		287,417		86.8	%		83.0	%
Total Managed Stabilized		255		151,981		152,140		18,952,563		19,014,236		89.4	%		84.5	%
Total Stabilized Stores		1,076		719,600		715,565		79,888,671		79,843,762		91.6	%		88.6	%

(1) Represents unit count as of March 31, 2015, which may differ from unit count as of March 31, 2014 due to unit conversions or expansions.

(2) Represents net rentable square feet as of March 31, 2015, which may differ from rentable square feet as of March 31, 2014 due to unit conversions or expansions.

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The following table presents additional information regarding the occupancy of our lease-up stores by state as of March 31, 2015 and 2014. The information as of March 31, 2014 is on a pro forma basis as though all the stores owned and/or managed at March 31, 2015 were under our control as of March 31, 2014.

Lease-up Store Data Based on Location

	Number of Stores		Company		Pro forma		Company		Pro forma		Company			Pro forma
Location			Number of Units as of March 31, 2015 (1)		Number of Units as of March 31, 2014		Net Rentable Square Feet as of March 31, 2015 (2)		Net Rentable Square Feet as of March 31, 2014		Square Foot Occupancy % March 31, 2015			Square Foot Occupancy % March 31, 2014
Wholly-Owned Stores
California (3)		1		—		569		—		57,898		0.0	%		95.5	%
Connecticut		1		1,105		1,095		89,460		90,210		64.2	%		0.9	%
Florida		1		544		558		81,941		88,172		86.4	%		43.1	%
Georgia		1		598		595		52,365		51,590		92.1	%		52.9	%
Illinois		1		658		585		52,757		47,228		61.2	%		85.4	%
Maryland		1		988		988		103,171		102,777		81.3	%		44.9	%
South Carolina		2		1,251		348		131,887		46,210		57.2	%		44.5	%
Texas		4		2,755		2,760		302,331		93,715		54.8	%		19.2	%
Virginia		1		455		455		56,805		56,805		69.3	%		63.8	%
Total Wholly-Owned in Lease-up		13		8,354		7,953		870,717		577,800		65.8	%		42.7	%
Managed Stores
Colorado		1		746		—		75,595		—		5.5	%		0.0	%
Georgia		1		578		—		70,330		—		12.1	%		0.0	%
Illinois		1		673		675		46,417		46,599		61.9	%		18.0	%
Maryland		2		918		433		83,359		44,790		49.9	%		59.5	%
Massachusetts		1		902		—		70,076		—		2.6	%		0.0	%
New York		2		2,580		2,234		162,600		128,875		77.8	%		91.6	%
North Carolina		2		770		—		68,736		—		7.8	%		0.0	%
South Carolina		1		1,002		—		97,620		—		38.5	%		0.0	%
Texas		1		609		614		70,251		70,223		70.0	%		55.3	%
Utah		1		516		532		67,037		65,981		86.8	%		0.7	%
Virginia		2		1,058		600		106,126		54,520		70.9	%		59.9	%
Washington		1		729		—		80,880		—		13.3	%		0.0	%
Total Managed in Lease-up		16		11,081		5,088		999,027		410,988		44.8	%		54.8	%
Total Lease-up Stores		30		20,125		13,041		1,929,233		988,788		53.3	%		47.7	%

(1) Represents unit count as of March 31, 2015, which may differ from unit count as of March 31, 2014 due to unit conversions or expansions.

(2) Represents net rentable square feet as of March 31, 2015, which may differ from rentable square feet as of March 31, 2014 due to unit conversions or expansions.

(3) In October 2014, a store located in Venice, California was damaged by fire. During the reconstruction period all units are unavailable.

RESULTS OF OPERATIONS

Comparison of the three months ended March 31, 2015 and 2014

Overview

Results for the three months ended March 31, 2015 included the operations of 835 stores (565 wholly-owned, 20 consolidated joint ventures, and 250 in joint ventures accounted for using the equity method) compared to the results for the three months ended March 31, 2014, which included the operations of 800 stores (527 wholly-owned, 19 consolidated joint ventures, and 254 in joint ventures accounted for using the equity method).

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Revenues

The following table presents information on revenues earned for the periods indicated:

	For the Three Months Ended March 31,				$ Change		% Change
	2015		2014
Revenues:
Property rental	$	148,894	$	132,001	$	16,893		12.8	%
Tenant reinsurance		16,510		13,463		3,047		22.6	%
Management fees and other income		7,750		7,123		627		8.8	%
Total revenues	$	173,154	$	152,587	$	20,567		13.5	%

Property Rental—The increase in property rental revenues for the three months ended March 31, 2015 was the result of an increase of $7,487 associated with acquisitions completed in 2015 and 2014, and an increase of $9,839 as a result of increases in occupancy and rental rates to new and existing customers at our stabilized stores. We acquired eight operating stores during the three months ended March 31, 2015 and 51 operating stores during 2014. Occupancy at our wholly-owned stabilized stores increased to 92.2% at March 31, 2015, as compared to 89.4% at March 31, 2014. Rental rates to new tenants for the three months ended March 31, 2015 increased an average of approximately 5.0% over the same period in the prior year.

Tenant Reinsurance—The increase in our tenant reinsurance revenues was partially due to the increase in overall customer participation to approximately 70.8% at March 31, 2015 compared to 68.7% at March 31, 2014. In addition, we operated 1,106 stores at March 31, 2015 compared to 1,052 stores at March 31, 2014.

Management Fees and Other Income—Our taxable REIT subsidiary (“TRS”), Extra Space Management, Inc., manages stores owned by our joint ventures and third parties. Management fees represent approximately 6% of cash collected from these stores. We also earn an asset management fee from one of our joint ventures, equal to 0.5% of the total asset value, provided certain conditions are met. The increase in management fee revenues was primarily due to an increase in revenues at the managed stores as a result of increases in occupancy and rental rates, and to an increase in the number of properties managed.

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Expenses

The following table presents information on expenses for the periods indicated:

	For the Three Months Ended March 31,				$ Change			% Change
	2015		2014
Expenses:
Property operations	$	47,244	$	43,482	$	3,762			8.7	%
Tenant reinsurance		2,928		2,567		361			14.1	%
Acquisition related costs		869		2,056		(1,187	)		(57.7	)%
General and administrative		16,249		15,709		540			3.4	%
Depreciation and amortization		30,428		28,375		2,053			7.2	%
Total expenses	$	97,718	$	92,189	$	5,529			6.0	%

Property Operations—The increase in property operations expense during the three months ended March 31, 2015 consisted primarily of increases in expenses associated with acquisitions completed in 2015 and 2014. We acquired eight operating stores during the three months ended March 31, 2015, and 51 operating stores during the year ended December 31, 2014.

Tenant Reinsurance—Tenant reinsurance expense represents the costs that are incurred to provide tenant reinsurance. The increase was primarily due to the increase in the number of stores we owned and/or managed. At March 31, 2015, we owned and/or managed 1,106 stores compared to 1,052 stores at March 31, 2014. In addition, there was an increase of overall customer participation to 70.8% at March 31, 2015 compared to 68.7% at March 31, 2014.

Acquisition Related Costs—These costs relate to acquisition activities during the periods indicated. The decrease in these expenses for the three months ended March 31, 2015 compared to the prior year was due to a decrease in the number of acquisitions completed during these periods. We completed the acquisition of eight stores during the three months ended March 31, 2015 compared to 21 stores during the same period in the prior year.

General and Administrative—General and administrative expenses primarily include all expenses not directly related to our stores, including corporate payroll, travel and professional fees. These expenses are recognized as incurred. General and administrative expenses for the three months ended March 31, 2015 increased when compared to the same period in the prior year primarily due to the overall cost associated with the management of additional stores. At March 31, 2015, we owned and/or managed 1,106 stores compared to 1,052 stores at March 31, 2014. We did not observe any material trends in specific payroll, travel or other expenses that contributed significantly to the increase in general and administrative expenses apart from the increase due to the management of additional stores.

Depreciation and Amortization—Depreciation and amortization expense increased as a result of the acquisition of new stores. We acquired eight stores during the three months ended March 31, 2015 and 51 stores during 2014.

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Other Revenues and Expenses

The following table presents information about other revenues and expenses for the periods indicated:

	For the Three Months Ended March 31,						$ Change			% Change
	2015			2014
Other income and expenses:
Interest expense	$	(21,431	)	$	(19,598	)	$	(1,833	)		9.4	%
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes		(697	)		(662	)		(35	)		5.3	%
Interest income		856			269			587			218.2	%
Interest income on note receivable from Preferred Operating Partnership unit holder		1,213			1,213			—			—
Equity in earnings of unconsolidated real estate ventures		2,650			2,419			231			9.5	%
Equity in earnings of unconsolidated real estate ventures—gain on sale of real estate assets and purchase of joint venture partners’ interests		2,857			—			2,857			100.0	%
Income tax expense		(2,248	)		(2,830	)		582			(20.6	%)
Total other expense, net	$	(16,800	)	$	(19,189	)	$	2,389			(12.4	%)

Interest Expense—The increase in interest expense during the three months ended March 31, 2015 was the result of an increase in debt over the same period in the prior year. The total face value of our debt, including our lines of credit, was $2,441,547 at March 31, 2015 compared to $2,121,462 at March 31, 2014.

Non-cash Interest Expense Related to Amortization of Discount on Equity Component of Exchangeable Senior Notes—Represents the amortization of the discount related to the equity component of the exchangeable senior notes issued by our Operating Partnership, which reflects the effective interest rate of 4.0% relative to the carrying amount of the liability.

Interest Income—Interest income represents amounts earned on cash and cash equivalents deposited with financial institutions and interest earned on notes receivable. The increase for the three months ended March 31, 2015 related primarily to an increase in the average balance of notes receivable compared to the same period in the prior year.

Interest Income on Note Receivable from Preferred Operating Partnership Unit Holders—Represents interest on a $100,000 loan to the holders of the Series A Participating Redeemable Preferred Units of our Operating Partnership (“Series A Units”).

Equity in Earnings of Unconsolidated Real Estate Ventures—Equity in earnings of unconsolidated real estate ventures represents the income earned through our ownership interests in unconsolidated joint ventures. The increase for the three months ended March 31, 2015 compared to the same period in the prior year was primarily the result of increases in revenue at the stores owned by the joint ventures. Occupancy at our joint venture stores increased to 92.4% as of March 31, 2015, compared to 90.7% as of March 31, 2014.

Equity in Earnings of Unconsolidated Real Estate Ventures—Gain on Sale of Real Estate Assets and Purchase of Joint Venture Partners’ Interests—During March 2015, one of our joint ventures sold a store located in New York to a third party and recognized a gain of $60,496. We recognized our 2.0% share of this gain, or $1,228. Additionally, in March 2015 we acquired a joint venture partner’s 82.4% equity interest in an existing joint venture. We previously held the remaining 17.6% equity interest in this joint venture. Prior to the acquisition, we accounted for our equity interest in this joint venture as an equity-method investment. We recognized a non-cash gain of $1,629 during the three months ended March 31, 2015 as a result of re-measuring the fair value of our equity interest in this joint venture held before the acquisition.

Income Tax Expense—For the three months ended March 31, 2015, the decrease in income tax expense was related to a royalty charged to our TRS by the Operating Partnership for access to and use of customer lists and intellectual property. The effect of this change lowered the taxable income of the TRS, which resulted in lower income tax expense.

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Net Income Allocated to Noncontrolling Interests

The following table presents information on net income allocated to noncontrolling interests for the periods indicated:

	For the Three Months Ended March 31,						$ Change			% Change
	2015			2014
Net income allocated to noncontrolling interests:
Net income allocated to Preferred Operating Partnership noncontrolling interests	$	(2,926	)	$	(2,492	)	$	(434	)		17.4	%
Net income allocated to Operating Partnership and other noncontrolling interests		(1,968	)		(1,377	)		(591	)		42.9	%
Total income allocated to noncontrolling interests:	$	(4,894	)	$	(3,869	)	$	(1,025	)		26.5	%

Net Income Allocated to Preferred Operating Partnership Noncontrolling Interests—In December 2014, as part of the acquisition of a single store, our Operating Partnership issued 548,390 Series D Units. The Series D Units have a liquidation value of $25.00 per unit, and receive distributions at an annual rate of 5.0%.

Between December 2013 and May 2014, as part of the Grupe acquisition, our Operating Partnership issued 704,016 Series C Units. The Series C Units have a liquidation value of $42.10 per unit. From issuance until the fifth anniversary of issuance, the Series C Units receive distributions at an annual rate of $0.18 plus the then-payable quarterly distribution per OP Unit.

In April 2014, as part of a single store acquisition, our Operating Partnership issued 333,360 Series B Units. In August and September 2013, as part of a portfolio acquisition, our Operating Partnership issued an additional 1,342,727 Series B Units. The Series B Units have a liquidation value of $25.00 per unit and receive distributions at an annual rate of 6%.

Income allocated to the Preferred Operating Partnership noncontrolling interests for the three months ended March 31, 2015 represents the fixed distributions paid to holders of the Series A Units, Series B Units, Series C Units and Series D Units, plus approximately 0.7% of the remaining net income allocated to holders of the Series A Units.

Net Income Allocated to Operating Partnership and Other Noncontrolling Interests—Income allocated to the Operating Partnership represents approximately 3.5% of net income after the allocation of the fixed distribution paid to the Preferred Operating Partnership unit holders for the three months ended March 31, 2015 and 2014.

FUNDS FROM OPERATIONS

Funds from Operations (“FFO”) provides relevant and meaningful information about our operating performance that is necessary, along with net income and cash flows, for an understanding of our operating results. We believe FFO is a meaningful disclosure as a supplement to net earnings. Net earnings assume that the values of real estate assets diminish predictably over time as reflected through depreciation and amortization expenses. The values of real estate assets fluctuate due to market conditions and we believe FFO more accurately reflects the value of our real estate assets. FFO is defined by the National Association of Real Estate Investment Trusts, Inc. (“NAREIT”) as net income computed in accordance with GAAP, excluding gains or losses on sales of operating stores and impairment write downs of depreciable real estate assets, plus depreciation and amortization and after adjustments to record unconsolidated partnerships and joint ventures on the same basis. We believe that to further understand our performance, FFO should be considered along with the reported net income and cash flows in accordance with GAAP, as presented in our condensed consolidated financial statements.

The computation of FFO may not be comparable to FFO reported by other REITs or real estate companies that do not define the term in accordance with the current NAREIT definition or that interpret the current NAREIT definition differently. FFO does not represent cash generated from operating activities determined in accordance with GAAP, and should not be considered as an alternative to net income as an indication of our performance, as an alternative to net cash flow from operating activities, as a measure of liquidity, or an indicator of our ability to make cash distributions.

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The following table presents the calculation of FFO for the periods indicated:

	For the Three Months Ended March 31,
	2015			2014
Net income attributable to common stockholders	$	53,742		$	37,340
Adjustments:
Real estate depreciation		26,118			23,240
Amortization of intangibles		2,797			3,726
Unconsolidated joint venture real estate depreciation and amortization		1,057			1,106
Unconsolidated joint venture gain on sale of real estate and purchase of partners’ interests		(2,857	)		—
Distributions paid on Series A Preferred Operating Partnership units		(1,274	)		(1,438	)
Income allocated to Operating Partnership noncontrolling interests		4,893			3,869
Funds from operations	$	84,476		$	67,843

SAME-STORE RESULTS

We consider our same-store stabilized portfolio to consist of only those stores that were wholly-owned at the beginning and at the end of the applicable periods presented that have achieved stabilization as of the first day of such period. The following table presents operating data for our same-store portfolio. We consider the following same-store presentation to be meaningful in regards to the stores shown below because these results provide information relating to store-level operating changes without the effects of acquisitions or completed developments.

	For the Three Months Ended March 31,						Percent Change
	2015			2014
Same-store rental and tenant reinsurance revenues	$	139,652		$	128,930			8.3	%
Same-store operating and tenant reinsurance expenses		42,278			41,559			1.7	%
Same-store net operating income		97,374			87,371			11.4	%
Non same-store rental and tenant reinsurance revenues		25,752			16,534			55.8	%
Non same-store operating and tenant reinsurance expenses		7,894			4,490			75.8	%
Total rental and tenant reinsurance revenues		165,404			145,464			13.7	%
Total operating and tenant reinsurance expenses		50,172			46,049			9.0	%
Same-store square foot occupancy as of quarter end		92.5	%		89.8	%
Properties included in same-store		503			503

The increase in same-store rental revenues for the three months ended March 31, 2015, as compared to the three months ended March 31, 2014, was due primarily to an increase in occupancy of 270 basis points and higher rental rates for both new and existing customers. Rental rates to new tenants for the three months ended March 31, 2015 increased an average of approximately 5.0% compared to the same period in the prior year. Same-store expenses were higher for the three months ended March 31, 2015 due to increases in property tax expense and repairs and maintenance. These increases in expenses were partially offset by decreases in property insurance and property operating expenses during the three months ended March 31, 2015.

CASH FLOWS

Cash flows provided by operating activities were $87,439 and $64,572, respectively, for the three months ended March 31, 2015 and 2014. The increase compared to the same period of the prior year primarily related to an increase in net income of $17,427. The remaining portion of the change related to an increase in accounts payable and accrued expenses of $13,747, an increase in other assets of $4,085 and a decrease in other liabilities of $4,213.

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Cash used in investing activities was $91,511 and $256,608, respectively, for the three months ended March 31, 2015 and 2014. The decrease was primarily due to a decrease in acquisition activity. Cash used in the acquisition of real estate assets decrease $176,857 during the three months ended March 31, 2015 compared to the same period in the prior year. We acquired eight stores during the three months ended March 31, 2015 compared to 21 stores acquired during the same period of the prior year.

Cash provided by financing activities was $1,713 and $112,238, respectively, for the three months ended March 31, 2015 and 2014. The change related primarily to an increase of $100,997 in the cash paid for principal payments on notes payable and lines of credit. There was also an increase of $8,385 in the cash paid for dividends on common stock.

LIQUIDITY AND CAPITAL RESOURCES

As of March 31, 2015, we had $45,304 available in cash and cash equivalents. We intend to use this cash to pay for future acquisitions, to repay debt and for general corporate purposes. We are required to distribute at least 90% of our net taxable income, excluding net capital gains, to our stockholders on an annual basis to maintain our qualification as a REIT.

Our cash and cash equivalents are held in accounts managed by third-party financial institutions and consist of invested cash and cash in our operating accounts. During 2014 and the first three months of 2015, we experienced no loss or lack of access to our cash or cash equivalents; however, there can be no assurance that access to our cash and cash equivalents will not be impacted by adverse conditions in the financial markets.

The following table presents information on our lines of credit for the periods indicated. All of our lines of credit are guaranteed by us and secured by mortgages on certain real estate assets.

	As of March 31, 2015							Origination Date	Maturity	Basis Rate (2)	Notes
Line of Credit	Amount Drawn		Capacity		Interest Rate
Credit Line 1	$	—	$	85,000		2.1	%	6/4/2010	6/3/2016	LIBOR plus 1.9%	(3)
Credit Line 2		—		50,000		1.9	%	11/16/2010	2/13/2017	LIBOR plus 1.8%	(4)
Credit Line 3		59,000		80,000		1.9	%	4/29/2011	11/18/2016	LIBOR plus 1.7%	(4)
Credit Line 4		40,000		50,000		1.9	%	9/29/2014	9/29/2017	LIBOR plus 1.7%	(4)
	$	99,000	$	265,000

(1) Amounts in thousands

(2) 30-day USD LIBOR

(3) One two-year extension available

(4) Two one-year extensions available

As of March 31, 2015, we had $2,441,547 face value of debt, resulting in a debt to total enterprise value ratio of 23.7%. As of March 31, 2015, the ratio of total fixed-rate debt and other instruments to total debt was 69.2% (including $921,635 on which we have interest rate swaps that have been included as fixed-rate debt). The weighted average interest rate of the total of fixed- and variable-rate debt at March 31, 2015 was 3.4%. Certain of our real estate assets are pledged as collateral for our debt. We are subject to certain restrictive covenants relating to our outstanding debt. We were in compliance with all financial covenants at March 31, 2015.

We expect to fund our short-term liquidity requirements, including operating expenses, recurring capital expenditures, dividends to stockholders, distributions to holders of Operating Partnership units and interest on our outstanding indebtedness, out of our operating cash flow, cash on hand and borrowings under our lines of credit. In addition, we are pursuing additional term loans secured by unencumbered stores.

Our liquidity needs consist primarily of cash distributions to stockholders, store acquisitions, principal payments under our borrowings and non-recurring capital expenditures. We may from time to time seek to repurchase our outstanding debt, shares of common stock or other securities in open market purchases, privately negotiated transactions or otherwise. Such repurchases, if any, will depend on

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prevailing market conditions, our liquidity requirements, contractual restrictions and other factors. In addition, we evaluate, on an ongoing basis, the merits of strategic acquisitions and other relationships, which may require us to raise additional funds. We do not expect that our operating cash flow or cash balances will be sufficient to fund our liquidity needs and instead expect to fund such needs out of additional borrowings of secured or unsecured indebtedness, joint ventures with third parties, and from the proceeds of public and private offerings of equity and debt. Additional capital may not be available on terms favorable to us or at all. Any additional issuance of equity or equity-linked securities may result in dilution to our stockholders. In addition, any new securities we issue could have rights, preferences and privileges senior to holders of our common stock. We may also use Operating Partnership units as currency to fund acquisitions from self-storage owners who desire tax-deferral in their exiting transactions.

OFF-BALANCE SHEET ARRANGEMENTS

Except as disclosed in the notes to our consolidated financial statements of our most recently filed Annual Report on Form 10-K, we do not currently have any relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purposes entities, which typically are established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes. Further, except as disclosed in the notes to our condensed consolidated financial statements, we have not guaranteed any obligations of unconsolidated entities, nor do we have any commitments or intent to provide funding to any such entities. Accordingly, we are not materially exposed to any financing, liquidity, market or credit risk that could arise if we had engaged in these relationships.

CONTRACTUAL OBLIGATIONS

The following table presents information on future payments due by period as of March 31, 2015:

	Payments due by Period:
	Total		Less Than 1 Year		1-3 Years		3-5 Years		After 5 Years
Operating leases	$	66,262	$	5,394	$	8,541	$	5,540	$	46,787
Notes payable, notes payable to trusts and lines of credit
Interest		359,891		75,166		110,230		64,410		110,085
Principal		2,441,547		263,825		741,759		820,741		615,222
Total contractual obligations	$	2,867,700	$	344,385	$	860,530	$	890,691	$	772,094

The operating leases above include minimum future lease payments on leases for 17 of our operating stores as well as leases of our corporate offices. Two ground leases include additional contingent rental payments based on the level of revenue achieved at the store.

As of March 31, 2015, the weighted average interest rate for all fixed-rate loans was 4.0%, and the weighted-average interest rate for all variable-rate loans was 2.0%.

FINANCING STRATEGY

We will continue to employ leverage in our capital structure in amounts reviewed from time to time by our board of directors. Although our board of directors has not adopted a policy that limits the total amount of indebtedness that we may incur, we will consider a number of factors in evaluating our level of indebtedness from time to time, as well as the amount of such indebtedness that will be either fixed- or variable-rate. In making financing decisions, we will consider factors including but not limited to:

• the interest rate of the proposed financing;

• the extent to which the financing impacts flexibility in managing our stores;

• prepayment penalties and restrictions on refinancing;

• the purchase price of stores acquired with debt financing;

• long-term objectives with respect to the financing;

• target investment returns;

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• the ability of particular stores, and our company as a whole, to generate cash flow sufficient to cover expected debt service payments;

• overall level of consolidated indebtedness;

• timing of debt and lease maturities;

• provisions that require recourse and cross-collateralization;

• corporate credit ratios including debt service coverage, debt to total capitalization and debt to undepreciated assets; and

• the overall ratio of fixed- and variable-rate debt.

Our indebtedness may be recourse, non-recourse or cross-collateralized. If the indebtedness is non-recourse, the collateral will be limited to the particular stores to which the indebtedness relates. In addition, we may invest in stores subject to existing loans collateralized by mortgages or similar liens on our stores, or we may refinance stores acquired on a leveraged basis. We may use the proceeds from any borrowings to refinance existing indebtedness, to refinance investments, including the redevelopment of existing stores, for general working capital or to purchase additional interests in partnerships or joint ventures or for other purposes when we believe it is advisable.

SEASONALITY

The self-storage business is subject to seasonal fluctuations. A greater portion of revenues and profits are realized from May through September. Historically, our highest level of occupancy has been at the end of July, while our lowest level of occupancy has been in late February and early March. Results for any quarter may not be indicative of the results that may be achieved for the full fiscal year.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Amounts in thousands, except store and share data, unless otherwise stated

Market Risk

Market risk refers to the risk of loss from adverse changes in market prices and interest rates. Our future income, cash flows and fair values of financial instruments are dependent upon prevailing market interest rates.

Interest Rate Risk

Interest rate risk is highly sensitive to many factors, including governmental monetary and tax policies, domestic and international economic and political considerations and other factors beyond our control.

As of March 31, 2015, we had $2,441,547 in total face value of debt, of which $753,148 was subject to variable interest rates (excluding debt with interest rate swaps). If LIBOR were to increase or decrease by 100 basis points, the increase or decrease in interest expense on the variable-rate debt (excluding variable-rate debt with interest rate floors) would increase or decrease future earnings and cash flows by $7,156 annually.

Interest rate risk amounts were determined by considering the impact of hypothetical interest rates on our financial instruments. These analyses do not consider the effect of any change in overall economic activity that could occur. Further, in the event of a change of that magnitude, we may take actions to further mitigate our exposure to the change. However, due to the uncertainty of the specific actions that would be taken and their possible effects, these analyses assume no changes in our financial structure.

The fair values of our fixed-rate assets and liabilities were as follows for the periods indicated:

	March 31, 2015				December 31, 2014
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	129,102	$	120,230	$	126,380	$	120,230
Fixed rate notes payable and notes payable to trusts	$	1,487,014	$	1,438,400	$	1,320,370	$	1,283,893
Exchangeable senior notes	$	310,625	$	250,000	$	276,095	$	250,000

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The fair values of our notes receivable from Preferred Operating Partnership unit holders were based on the discounted estimated future cash flows of the notes (categorized within Level 3 of the fair value hierarchy); the discount rate used approximated the current market rate for loans with similar maturities and credit quality. The fair values of our fixed-rate notes payable and notes payable to trusts were estimated using the discounted estimated future cash payments to be made on such debt (categorized within Level 3 of the fair value hierarchy); the discount rates used approximated current market rates for loans, or groups of loans, with similar maturities and credit quality. The fair value of our exchangeable senior notes was estimated using an average market price for similar securities obtained from a third party.

ITEM 4. CONTROLS AND PROCEDURES

(1) Disclosure Controls and Procedures

We maintain disclosure controls and procedures to ensure that information required to be disclosed in the reports we file pursuant to the Securities Exchange Act of 1934, as amended, or the Exchange Act, are recorded, processed, summarized and reported within the time periods specified in the rules and forms of the Securities and Exchange Commission, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure based on the definition of “disclosure controls and procedures” in Rule 13a-15(e) of the Exchange Act. In designing and evaluating the disclosure controls and procedures, management recognized that any controls and procedures, no matter how well designed and operated, can only provide a reasonable assurance of achieving the desired control objectives, and in reaching a reasonable level of assurance, management necessarily was required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

We have a disclosure committee that is responsible for considering the materiality of information and determining our disclosure obligations a timely basis. The disclosure committee meets quarterly and reports directly to our Chief Executive Officer and Chief Financial Officer.

We carried out an evaluation, under the supervision and with the participation of management, including our Chief Executive Officer and the Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures as of the end of the period covered by this report. Based upon that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective at the reasonable assurance level as of the end of the period covered by this report.

(2) Changes in internal control over financial reporting

There were no changes in our internal control over financial reporting (as such term is defined in Exchange Act Rule 13a-15(f)) that occurred during our most recent quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

We are involved in various litigation and legal proceedings in the ordinary course of business. We are not a party to any material litigation or legal proceedings, or to the best of our knowledge, any threatened litigation or legal proceedings which, in the opinion of management, are expected to have a material adverse effect on our financial condition or results of operations either individually or in the aggregate.

ITEM 1A. RISK FACTORS

There have been no material changes in our risk factors from those disclosed in our 2014 Annual Report on Form 10-K.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

None.

38

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not Applicable.

ITEM 5. OTHER INFORMATION

None.

39

ITEM 6. EXHIBITS

31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certifications of the Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101	The following materials from Extra Space Storage Inc.’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2015 are formatted in XBRL (eXtensible Business Reporting Language): (1) the Condensed Consolidated Balance Sheets, (2) the Condensed Consolidated Statements of Operations, (3) the Condensed Consolidated Statements of Comprehensive Income (4) the Condensed Consolidated Statement of Noncontrolling Interests and Equity, (5) the Condensed Consolidated Statements of Cash Flows and (6) notes to these financial statements.

40

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	EXTRA SPACE STORAGE INC. Registrant
Date: May 8, 2015	/s/ Spencer F. Kirk
	Spencer F. Kirk
	Chief Executive Officer (Principal Executive Officer)
Date: May 8, 2015	/s/ P. Scott Stubbs
	P. Scott Stubbs
	Executive Vice President and Chief Financial Officer (Principal Financial Officer)

41

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Spencer F. Kirk, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Extra Space Storage Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 8, 2015	By:	/s/ Spencer F. Kirk
	Name:	Spencer F. Kirk
	Title:	Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, P. Scott Stubbs, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Extra Space Storage Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 8, 2015	By:	/s/ P. Scott Stubbs
	Name:	P. Scott Stubbs
	Title:	Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification of Chief Executive Officer and Chief Financial Officer

Pursuant to

18 U.S.C. Section 1350,

as adopted pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

The undersigned, the Chief Executive Officer of Extra Space Storage Inc. (the “Company”), hereby certifies to his knowledge on the date hereof, pursuant to 18 U.S.C. 1350(a), as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report on Form 10-Q for the quarter ended March 31, 2015 (the “Form 10-Q”), filed concurrently herewith by the Company, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and that the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:	/s/ Spencer F. Kirk
Name:	Spencer F. Kirk
Title:	Chief Executive Officer
Date:	May 8, 2015

The undersigned, the Chief Financial Officer of Extra Space Storage Inc. (the “Company”), hereby certifies to his knowledge on the date hereof, pursuant to 18 U.S.C. 1350(a), as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report on Form 10-Q for the quarter ended March 31, 2015 (the “Form 10-Q”), filed concurrently herewith by the Company, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and that the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:	/s/ P. Scott Stubbs
Name:	P. Scott Stubbs
Title:	Executive Vice President and Chief Financial Officer
Date:	May 8, 2015

XML

Variable Interests - Additional Information (Detail)	Mar. 31, 2015 JointVenture Item
Variable Interests And Equity Method Investments Disclosure [Abstract]
Number of wholly-owned unconsolidated subsidiaries	3
Number of interests in consolidated VIE joint ventures	0

XML

Equity in Earnings of Unconsolidated Real Estate Ventures - Gain on Sale of Real Estate and Purchase of Joint Venture Partners' Interests - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Ownership interest acquired in joint venture (as a percent)	82.40%
Cash paid for acquiring equity interest in the joint venture	$ 1,700
Company held mortgage notes receivable eliminated as a result of the acquisition	11,009
Equity ownership prior to the acquisition (as a percent)	17.60%
Non-cash gain	1,629
ESS PRISA II LLC [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Ownership interest percentage	2.00%
Gain (loss) on sale of property	60,496
Percentage of gain from sale of property	2.00%
Gain (loss) from sale of property	1,228
ESS PRISA II LLC [Member] | NEW YORK
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Number of operating stores sold by consolidated joint venture	1
Proceeds from sale of property	$ 90,000

XML

Noncontrolling Interest Represented by Preferred Operating Partnership Units - Series A Participating Redeemable Preferred Units - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended	0 Months Ended
	Jun. 15, 2007 Property	Mar. 31, 2015	Oct. 03, 2014 Share_for_Share	Jun. 25, 2007	Dec. 31, 2014
Noncontrolling Interest in Operating Partnership [Line Items]
Loan to holders of preferred OP units		$ 120,230			$ 120,230
Operating Partnership [Member] | Series A Participating Redeemable Preferred Units [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Number of stores acquired	10
Operating Partnership [Member] | Series A Participating Redeemable Preferred Units [Member] | Series A Units [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Preferred units issued as part of acquisition	989,980
Fixed priority return on preferred OP units, stated return rate (as a percent)		5.00%
Fixed priority return on preferred OP units, amount		115,000
Fixed priority return on preferred OP units, liquidation value		115,000
Operating Partnership Holders of A Units [Member] | Series A Participating Redeemable Preferred Units [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Loan to holders of preferred OP units				100,000
Note receivable interest rate (as a percent)				4.85%
Maximum number of preferred OP units converted prior to the maturity date of the loan (in shares)				114,500
A units redeemed			114,500
A units redeemed ,value			4,794
Additional units redeemed			0
Common stock shares redeemed			280,331
Preferred OP units, current liquidation value			$ 101,699

XML

Segment Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015 Segments
Segment Reporting [Abstract]
Number of reportable segments	3

XML

Exchangeable Senior Notes - Schedule of Information about Carrying Amount of Equity Component, Principal Amount of Liability Component, Unamortized Discount and Net Carrying Amount for Notes (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Jun. 21, 2013
Debt Instrument [Line Items]
Principal amount of liability component	$ 250,000	$ 250,000
Unamortized cash discount	(12,169)	(13,054)
Operating Partnership [Member] | 2.375% Exchangeable Senior Notes [Member]
Debt Instrument [Line Items]
Carrying amount of equity component	14,496	14,496
Principal amount of liability component	250,000	250,000
Unamortized discount-equity component	(9,751)	(10,448)
Unamortized cash discount	(2,418)	(2,606)	(3,750)
Net carrying amount of liability component	$ 237,831	$ 236,946

XML

Fair Value Disclosures - Schedule of Fair Value of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value of Financial Instruments [Line Items]
Notes receivable from Preferred Operating Partnership unit holders	$ 120,230	$ 120,230
Exchangeable senior notes	250,000	250,000
Carrying Value [Member]
Fair Value of Financial Instruments [Line Items]
Notes receivable from Preferred Operating Partnership unit holders	120,230	120,230
Fixed rate notes payable and notes payable to trusts	1,438,400	1,283,893
Exchangeable senior notes	250,000	250,000
Fair Value [Member]
Fair Value of Financial Instruments [Line Items]
Notes receivable from Preferred Operating Partnership unit holders	129,102	126,380
Fixed rate notes payable and notes payable to trusts	1,487,014	1,320,370
Exchangeable senior notes	$ 310,625	$ 276,095

XML

Commitments and Contingencies - Additional Information (Detail) (Contract Amount [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Contract Amount [Member]
Commitments And Contingencies [Line Items]
Number of stores to be acquired	42
Number of stores scheduled to be closed	34
Purchase price	$ 374,283

XML

Store Acquisitions (Tables)

3 Months Ended

Mar. 31, 2015

Business Combinations [Abstract]

Schedule of Operating Properties Acquired

The following table summarizes the Company’s acquisitions of operating stores for the three months ended March 31, 2015, and does not include purchases of raw land or improvements made to existing assets:

	Number of Stores		Date of Acquisition		Consideration Paid														Acquisition Date Fair Value
Property Location					Total		Cash Paid		Non-cash gain		Notes Receivable		Previous equity interest			Net Liabilities/(Assets) Assumed			Land		Building		Intangible		Closing costs— expensed (1)
California (2)		1		3/30/2015	$	12,699	$	1,700	$	1,629	$	11,009	$	(1,264	)	$	(375	)	$	1,025	$	11,479	$	195	$	—
North Carolina, South Carolina		2		3/30/2015		13,165		13,143		—		—		—			22			1,763		11,229		144		29
Virginia		1		3/17/2015		5,073		5,065		—		—		—			8			118		4,797		81		77
Texas		1		2/24/2015		13,570		13,519		—		—		—			51			1,511		11,861		182		16
Texas		3		1/13/2015		41,904		41,806		—		—		—			98			12,080		29,489		300		35
2015 Totals		8			$	86,411	$	75,233	$	1,629	$	11,009	$	(1,264	)	$	(196	)	$	16,497	$	68,855	$	902	$	157

(1) This column represents costs paid at closing. The amounts shown exclude other acquisition costs paid before or after the closing date.

(2) This represents the acquisition of a joint venture partners’ interest in Extra Space of Sacramento One LLC (“Sacramento One”), an existing joint venture, for $1,700 in cash. The result of the acquisition is that the Company owns 100% of Sacramento One, which owned one store located in California. Prior to the acquisition date, the Company accounted for its interest in Sacramento One as an equity-method investment, and the Company also held mortgage notes receivable from Sacramento One totalling $11,009, including related interest. The total acquisition date fair value of the Company’s previous equity interest was approximately $365 and is included in consideration transfered. The Company recognized a non-cash gain of $1,629 as a result of remeasuring the fair value of its equity interest held prior to the acquisition. The store is consolidated subsequent to the acquisition as the Company owns 100% of the store.

XML

Noncontrolling Interest Represented by Preferred Operating Partnership Units - Series C Convertible Redeemable Preferred Units - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended	0 Months Ended	6 Months Ended
	Dec. 31, 2014	Mar. 31, 2015 OperatingPartnershipUnits	Nov. 19, 2013 Store	May 31, 2014 Store
Noncontrolling Interest in Operating Partnership [Line Items]
Loan to holders of preferred OP units	$ 120,230	$ 120,230
Series C Convertible Redeemable Preferred Units [Member] | Series C Units [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Liquidation value (in dollars per share)		$ 42.10
Fixed liquidation value		29,639
Quarterly distribution per preferred OP unit payable above quarterly distribution for common OP Unit		$ 0.18
Number of quarters immediately preceding the fifth anniversary of issuance for which distribution is payable		12 months
Period from date of issuance after which preferred OP units will become redeemable at the option of the holder		1 year
Period from date of issuance after which preferred OP units will become convertible into common OP units at the option of the holder		1 year
Preferred OP units conversion ratio		0.9145
Loan to holders of preferred OP units	20,230
Note receivable interest rate (as a percent)	5.00%
Note receivable maturity date	Dec. 15, 2024
California, Properties Acquired December 2013 [Member] | Series C Convertible Redeemable Preferred Units [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Number of self storage facilities acquired			12
Ownership interest in five stores through joint ventures prior to the acquisition				35.00%
Ownership interest in one store through joint ventures prior to the acquisition				40.00%
Number of stores in which ownership interest was held prior to acquisition				1
Number of stores in which ownership interest was held prior to acquisition of remaining properties				5
California, Properties Acquired December 2013 [Member] | Series C Convertible Redeemable Preferred Units [Member] | Operating Partnership [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Number of stores acquired				6
Cash portion of payment for acquisition				45,722
Debt assumed				37,532
California, Properties Acquired December 2013 [Member] | Series C Convertible Redeemable Preferred Units [Member] | Series C Units [Member] | Operating Partnership [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Preferred Units Issued as Part of Acquisition (in shares)				704,016
Preferred OP units issued as part of the acquisition				$ 30,960

XML

Derivatives - Schedule of Balance Sheet Classification and Fair Value of Entity's Derivative Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Other Assets [Member]
Derivative [Line Items]
Other assets - Asset (Liability) Derivatives	$ 688	$ 3,583
Other Liabilities [Member]
Derivative [Line Items]
Other liabilities - Asset (Liability) Derivatives	$ (7,231)	$ (3,533)

XML

Store Acquisitions - Schedule of Operating Properties Acquired (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Property
Property Acquisitions [Line Items]
Number of Stores	8
Total Consideration Paid	$ 86,411
Cash Consideration Paid	75,233
Non-cash gain	1,629
Notes Receivable	11,009
Previous equity interest	(1,264)
Net Liabilities/(Assets) Assumed	(196)
Acquisition Date Fair Value, Land	16,497
Acquisition Date Fair Value, Building	68,855
Acquisition Date Fair Value, Intangible	902
Closing costs-expensed	157
California 1 Property 3/30/2015 [Member ]
Property Acquisitions [Line Items]
Number of Stores	1
Total Consideration Paid	12,699
Cash Consideration Paid	1,700
Non-cash gain	1,629
Notes Receivable	11,009
Previous equity interest	(1,264)
Net Liabilities/(Assets) Assumed	(375)
Acquisition Date Fair Value, Land	1,025
Acquisition Date Fair Value, Building	11,479
Acquisition Date Fair Value, Intangible	195
North Carolina South Carolina 2 Property 3/30/2015 [Member]
Property Acquisitions [Line Items]
Number of Stores	2
Total Consideration Paid	13,165
Cash Consideration Paid	13,143
Net Liabilities/(Assets) Assumed	22
Acquisition Date Fair Value, Land	1,763
Acquisition Date Fair Value, Building	11,229
Acquisition Date Fair Value, Intangible	144
Closing costs-expensed	29
Virginia 1 Property 3/17/2015 [Member]
Property Acquisitions [Line Items]
Number of Stores	1
Total Consideration Paid	5,073
Cash Consideration Paid	5,065
Net Liabilities/(Assets) Assumed	8
Acquisition Date Fair Value, Land	118
Acquisition Date Fair Value, Building	4,797
Acquisition Date Fair Value, Intangible	81
Closing costs-expensed	77
Texas 1 Property 2/24/2015 [Member]
Property Acquisitions [Line Items]
Number of Stores	1
Total Consideration Paid	13,570
Cash Consideration Paid	13,519
Net Liabilities/(Assets) Assumed	51
Acquisition Date Fair Value, Land	1,511
Acquisition Date Fair Value, Building	11,861
Acquisition Date Fair Value, Intangible	182
Closing costs-expensed	16
Texas 3 Property January 13, 2015 [Member]
Property Acquisitions [Line Items]
Number of Stores	3
Total Consideration Paid	41,904
Cash Consideration Paid	41,806
Net Liabilities/(Assets) Assumed	98
Acquisition Date Fair Value, Land	12,080
Acquisition Date Fair Value, Building	29,489
Acquisition Date Fair Value, Intangible	300
Closing costs-expensed	$ 35

XML

Noncontrolling Interest in Operating Partnership - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Noncontrolling Interest in Operating Partnership [Line Items]
Period used as a denomination to determine the average closing price of common stock	10 days
OP units conversion basis	One-for-one basis
Ten day average closing stock price	$ 67.76
Consideration to be paid on redemption of common OP units	$ 295,832
Operating Partnership [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Ownership interest held by entity (as a percent)	93.40%
Noncontrolling interest in operating partnership (as a percent)	6.60%
OP units outstanding	4,365,879

XML

Exchangeable Senior Notes - Summary of Amount of Interest Cost Recognized Relating to Contractual Interest Rate and Amortization of Discount on Liability Component of Notes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Debt Instrument [Line Items]
Amortization of discount	$ 697	$ 662
2033 Notes [Member]
Debt Instrument [Line Items]
Contractual interest	1,484	1,484
Amortization of discount	697	662
Total interest expense recognized	$ 2,181	$ 2,146

XML

Organization

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Organization

1. ORGANIZATION

Extra Space Storage Inc. (the “Company”) is a fully-integrated, self-administered and self-managed real estate investment trust (“REIT”), formed as a Maryland corporation on April 30, 2004, to own, operate, manage, acquire, develop and redevelop professionally managed self-storage properties (“stores”) located throughout the United States. The Company continues the business of Extra Space Storage LLC and its subsidiaries, which had engaged in the self-storage business since 1977. The Company’s interests in its stores is held through its operating partnership, Extra Space Storage LP (the “Operating Partnership”), which was formed on May 5, 2004. The Company’s primary assets are general partner and limited partner interests in the Operating Partnership. This structure is commonly referred to as an umbrella partnership REIT (“UPREIT”). The Company has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended. To the extent the Company continues to qualify as a REIT, it will not be subject to tax, with certain limited exceptions, on the taxable income that is distributed to its stockholders.

The Company invests in stores by acquiring wholly-owned stores or by acquiring an equity interest in real estate entities. At March 31, 2015, the Company had direct and indirect equity interests in 835 stores. In addition, the Company managed 271 stores for third parties, bringing the total number of stores which it owns and/or manages to 1,106. These stores are located in 35 states, Washington, D.C. and Puerto Rico.

The Company operates in three distinct segments: (1) rental operations; (2) tenant reinsurance; and (3) property management, acquisition and development. The rental operations activities include rental operations of stores in which we have an ownership interest. No single tenant accounts for more than 5.0% of rental income. Tenant reinsurance activities include the reinsurance of risks relating to the loss of goods stored by tenants in the Company’s stores. The Company’s property management, acquisition and development activities include managing, acquiring, developing and selling stores.

XML

Derivatives - Interest Payments Recognized as Increase or Decrease in Interest Expense (Detail) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Interest Rate Swap [Member]
Derivative [Line Items]
Swap agreements increase (decrease) in interest expenses due to interest payments	$ (2,297)	$ (2,293)

XML

Segment Information (Tables)

3 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Schedule of Financial Information of Business Segments

Financial information for the Company’s business segments is presented below:

	March 31, 2015		December 31, 2014
Balance Sheet
Investment in unconsolidated real estate ventures
Rental operations	$	85,602	$	85,711
Total assets
Rental operations	$	4,194,744	$	4,109,673
Tenant reinsurance		38,745		39,383
Property management, acquisition and development		230,656		253,051
	$	4,464,145	$	4,402,107

	For the Three Months Ended March 31,
	2015			2014
Statement of Operations
Total revenues
Rental operations	$	148,894		$	132,001
Tenant reinsurance		16,510			13,463
Property management, acquisition and development		7,750			7,123
		173,154			152,587
Operating expenses, including depreciation and amortization
Rental operations		75,509			69,942
Tenant reinsurance		2,928			2,567
Property management, acquisition and development		19,281			19,680
		97,718			92,189
Income (loss) from operations
Rental operations		73,385			62,059
Tenant reinsurance		13,582			10,896
Property management, acquisition and development		(11,531	)		(12,557	)
		75,436			60,398
Interest expense
Rental operations		(21,830	)		(19,310	)
Property management, acquisition and development		399			(288	)
		(21,431	)		(19,598	)
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes
Property management, acquisition and development		(697	)		(662	)
Interest income
Tenant reinsurance		4			4
Property management, acquisition and development		852			265
		856			269
Interest income on note receivable from Preferred Operating Partnership unit holder
Property management, acquisition and development		1,213			1,213
Equity in earnings of unconsolidated real estate ventures
Rental operations		2,650			2,419
Equity in earnings of unconsolidated real estate ventures—gain on sale of real estate assets and purchase of partners’ interests
Rental operations		2,857			—
Income tax expense
Rental operations		(754	)		(434	)
Tenant reinsurance		(1,874	)		(3,815	)
Property management, acquisition and development		380			1,419
		(2,248	)		(2,830	)
Net income (loss)
Rental operations		56,308			44,734
Tenant reinsurance		11,712			7,085
Property management, acquisition and development		(9,384	)		(10,610	)
	$	58,636		$	41,209
Depreciation and amortization expense
Rental operations	$	28,265		$	26,460
Property management, acquisition and development		2,163			1,915
	$	30,428		$	28,375
Statement of Cash Flows
Acquisition of real estate assets
Property management, acquisition and development	$	(77,082	)	$	(253,939	)
Development and redevelopment of real estate assets
Property management, acquisition and development	$	(3,140	)	$	(2,820	)

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Exchangeable Senior Notes (Tables)

3 Months Ended

Mar. 31, 2015

Text Block [Abstract]

Schedule of Information about Carrying Amount of Equity Component, Principal Amount of Liability Component, Unamortized Discount and Net Carrying Amount for Notes

Information about the carrying amount of the equity component, the principal amount of the liability component, its unamortized discount and its net carrying amount was as follows for the periods indicated:

	March 31, 2015			December 31, 2014
Carrying amount of equity component	$	14,496		$	14,496
Principal amount of liability component	$	250,000		$	250,000
Unamortized discount—equity component		(9,751	)		(10,448	)
Unamortized cash discount		(2,418	)		(2,606	)
Net carrying amount of liability component	$	237,831		$	236,946

Summary of Amount of Interest Cost Recognized Relating to Contractual Interest Rate and Amortization of Discount on Liability Component of Notes

The amount of interest cost recognized relating to the contractual interest rate and the amortization of the discount on the liability component of the Notes were as follows for the periods indicated:

	For the Three Months Ended March 31,
	2015		2014
Contractual interest	$	1,484	$	1,484
Amortization of discount		697		662
Total interest expense recognized	$	2,181	$	2,146

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Segment Information - Schedule of Financial Information of Business Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Investment in unconsolidated real estate ventures	$ 85,602		$ 85,711
Total assets	4,464,145		4,402,107
Total revenues	173,154	152,587
Operating expenses, including depreciation and amortization	97,718	92,189
Income (loss) from operations	75,436	60,398
Interest expense	(21,431)	(19,598)
Interest income	856	269
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes	(697)	(662)
Interest income on note receivable from Preferred Operating Partnership unit holder	1,213	1,213
Equity in earnings of unconsolidated real estate ventures	2,650	2,419
Equity in earnings of unconsolidated real estate ventures - gain on sale of real assets and purchase of partners' interests	2,857
Income tax expense	(2,248)	(2,830)
Net income (loss)	58,636	41,209
Depreciation and amortization expense	30,428	28,375
Acquisition of real estate assets	(77,082)	(253,939)
Development and redevelopment of real estate assets	(3,140)	(2,820)
Rental Operations [Member]
Segment Reporting Information [Line Items]
Investment in unconsolidated real estate ventures	85,602		85,711
Total assets	4,194,744		4,109,673
Total revenues	148,894	132,001
Operating expenses, including depreciation and amortization	75,509	69,942
Income (loss) from operations	73,385	62,059
Interest expense	(21,830)	(19,310)
Equity in earnings of unconsolidated real estate ventures	2,650	2,419
Equity in earnings of unconsolidated real estate ventures - gain on sale of real assets and purchase of partners' interests	2,857
Income tax expense	(754)	(434)
Net income (loss)	56,308	44,734
Depreciation and amortization expense	28,265	26,460
Tenant Reinsurance [Member]
Segment Reporting Information [Line Items]
Total assets	38,745		39,383
Total revenues	16,510	13,463
Operating expenses, including depreciation and amortization	2,928	2,567
Income (loss) from operations	13,582	10,896
Interest income	4	4
Income tax expense	(1,874)	(3,815)
Net income (loss)	11,712	7,085
Property Management Acquisition and Development [Member]
Segment Reporting Information [Line Items]
Total assets	230,656		253,051
Total revenues	7,750	7,123
Operating expenses, including depreciation and amortization	19,281	19,680
Income (loss) from operations	(11,531)	(12,557)
Interest expense	399	(288)
Interest income	852	265
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes	(697)	(662)
Interest income on note receivable from Preferred Operating Partnership unit holder	1,213	1,213
Income tax expense	380	1,419
Net income (loss)	(9,384)	(10,610)
Depreciation and amortization expense	2,163	1,915
Acquisition of real estate assets	(77,082)	(253,939)
Development and redevelopment of real estate assets	$ (3,140)	$ (2,820)

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Derivatives - Schedule of Information Relating to Gain (Loss) Recognized on Swap Agreements (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Swap agreements gain (loss) recognized in OCI	$ (8,875)	$ (5,043)
Swap agreements gain (loss) reclassified from OCI - Interest expense	$ (2,297)	$ (2,293)

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Organization - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015 Segments Store
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of operating storage facilities in which the entity has equity interests (in stores)	835
Number of stores owned by franchisees and third parties	271
Number of operating stores owned and/or managed	1,106
Number of states in which operating storage facilities are located	35
Number of reportable segments	3
Rental Revenue [Member] | Customer Concentration Risk [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Maximum percentage of rental income accounted for by any single tenant	5.00%

XML

Fair Value Disclosures - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (Recurring Basis [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets-Cash Flow Hedge Swap Agreements	$ 688
Other liabilities-Cash Flow Hedge Swap Agreements	(7,231)
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets-Cash Flow Hedge Swap Agreements	688
Other liabilities-Cash Flow Hedge Swap Agreements	$ (7,231)

XML

Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 58,636	$ 41,209
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	30,428	28,375
Amortization of deferred financing costs	1,598	1,641
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	697	662
Non-cash interest expense related to amortization of premium on notes payable	(747)	(895)
Compensation expense related to stock-based awards	1,142	1,121
Gain on sale of real estate assets and purchase of joint venture partners' interests	(2,857)
Distributions from unconsolidated real estate ventures in excess of earnings	2,601	1,024
Changes in operating assets and liabilities:
Receivables from related parties and affiliated real estate joint ventures	(2,367)	(1,424)
Other assets	(2,637)	1,448
Accounts payable and accrued expenses	6,032	(7,715)
Other liabilities	(5,087)	(874)
Net cash provided by operating activities	87,439	64,572
Cash flows from investing activities:
Acquisition of real estate assets	(77,082)	(253,939)
Development and redevelopment of real estate assets	(3,140)	(2,820)
Change in restricted cash	(10,105)	1,425
Purchase of equipment and fixtures	(1,184)	(1,274)
Net cash used in investing activities	(91,511)	(256,608)
Cash flows from financing activities:
Proceeds from notes payable and lines of credit	290,768	291,157
Principal payments on notes payable and lines of credit	(228,878)	(127,881)
Deferred financing costs	(1,419)	(1,392)
Net proceeds from exercise of stock options	970	1,056
Dividends paid on common stock	(54,732)	(46,347)
Distributions to noncontrolling interests	(4,996)	(4,265)
Net cash provided by financing activities	1,713	112,328
Net decrease in cash and cash equivalents	(2,359)	(79,708)
Cash and cash equivalents, beginning of the period	47,663	126,723
Cash and cash equivalents, end of the period	45,304	47,015
Supplemental schedule of cash flow information
Interest paid	21,754	16,445
Income taxes paid	661	1,244
Tax effect from vesting of restricted stock grants and option exercises
Other assets	644	1,262
Paid-in capital	(644)	(1,262)
Acquisitions of real estate assets
Real estate assets, net	11,009
Receivables from related parties and affiliated real estate joint ventures	$ (11,009)

XML

Fair Value Disclosures - Additional Information (Detail) (USD $)	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Transfer of assets between level 1 and level 2	$ 0
Transfer of assets between level 2 and level 1	0
Transfer of liabilities between level 1 and level 2	0
Transfer of liabilities between level 2 and level 1	$ 0

XML

Variable Interests - Schedule of Liabilities and Maximum Exposure to Loss Related to Trusts (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Notes payable to Trusts	$ 119,590	$ 119,590
Operating Partnership [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Notes payable to Trusts	119,590
Investment Balance	3,590
Maximum exposure to loss	116,000
Difference	0
Operating Partnership [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Trust I [Member]
Variable Interest Entity [Line Items]
Notes payable to Trusts	36,083
Investment Balance	1,083
Maximum exposure to loss	35,000
Difference	0
Operating Partnership [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Trust II [Member]
Variable Interest Entity [Line Items]
Notes payable to Trusts	42,269
Investment Balance	1,269
Maximum exposure to loss	41,000
Difference	0
Operating Partnership [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Trust III [Member]
Variable Interest Entity [Line Items]
Notes payable to Trusts	41,238
Investment Balance	1,238
Maximum exposure to loss	40,000
Difference	$ 0

XML

Other Noncontrolling Interests - Additional Information (Detail)	Mar. 31, 2015 Store
Noncontrolling Interest in Operating Partnership [Line Items]
Number of operating stores owned by consolidated joint venture	19
Other [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Number of consolidated joint ventures	2
Other [Member] | Minimum [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Ownership interests of third party owners	1.00%
Other [Member] | Maximum [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Ownership interests of third party owners	3.30%

XML

Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets:
Real estate assets, net	$ 4,197,853	$ 4,135,696
Investments in unconsolidated real estate ventures	85,602	85,711
Cash and cash equivalents	45,304	47,663
Restricted cash	35,350	25,245
Receivables from related parties and affiliated real estate joint ventures	3,136	11,778
Other assets, net	96,900	96,014
Total assets	4,464,145	4,402,107
Liabilities, Noncontrolling Interests and Equity:
Notes payable	1,972,957	1,872,067
Premium on notes payable	2,534	3,281
Exchangeable senior notes	250,000	250,000
Discount on exchangeable senior notes	(12,169)	(13,054)
Notes payable to Trusts	119,590	119,590
Lines of credit	99,000	138,000
Accounts payable and accrued expenses	71,553	65,521
Other liabilities	53,625	54,719
Total liabilities	2,557,090	2,490,124
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, 500,000,000 shares authorized, 116,458,159 and 116,360,239 shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively	1,164	1,163
Additional paid-in capital	1,998,240	1,995,484
Accumulated other comprehensive loss	(7,800)	(1,484)
Accumulated deficit	(258,728)	(257,738)
Total Extra Space Storage Inc. stockholders' equity	1,732,876	1,737,425
Noncontrolling interest represented by Preferred Operating Partnership units, net of $120,230 notes receivable	81,088	81,152
Noncontrolling interests in Operating Partnership	92,105	92,422
Other noncontrolling interests	986	984
Total noncontrolling interests and equity	1,907,055	1,911,983
Total liabilities, noncontrolling interests and equity	$ 4,464,145	$ 4,402,107

XML

Exchangeable Senior Notes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended
	Jun. 21, 2013	Mar. 31, 2015	Dec. 31, 2014	Jun. 21, 2013
Debt Instrument [Line Items]
Unamortized cash discount		$ 12,169	$ 13,054
Effective interest rate on the liability component		4.00%
2.375% Exchangeable Senior Notes [Member] | Operating Partnership [Member]
Debt Instrument [Line Items]
Principal amount of notes issued	250,000	250,000		250,000
Interest rate	2.375%	2.375%		2.375%
Discount rate (as a percent)	1.50%			1.50%
Issuance cost	1,672
Amortization period	5 years
Conversion ratio, number of shares per $1,000 principal amount, numerator		17.98
Principal amount used for debt instrument conversion ratio		1,000
Unamortized cash discount	$ 3,750	$ 2,418	$ 2,606	$ 3,750
Redemption price as percentage of principal amount of notes plus accrued and unpaid interest	100.00%
Redemption price as percentage of principal amount of notes at request of debt holders and upon occurrence of designated event	100.00%
Minimum [Member] | 2.375% Exchangeable Senior Notes [Member] | Operating Partnership [Member]
Debt Instrument [Line Items]
Number of days of written notice to holders of notes required for redemption	30 days
Maximum [Member] | 2.375% Exchangeable Senior Notes [Member] | Operating Partnership [Member]
Debt Instrument [Line Items]
Number of days of written notice to holders of notes required for redemption	60 days

XML

Condensed Consolidated Statement of Noncontrolling Interests and Equity (USD $) In Thousands, except Share data	Total	Series A Preferred Operating Partnership [Member]	Series B Preferred Operating Partnership [Member]	Series C Preferred Operating Partnership [Member]	Series D Preferred Operating Partnership [Member]	Common Operating Partnership [Member]	Other [Member]	Par Value [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]
Balances at Dec. 31, 2014	$ 1,911,983	$ 14,809	$ 41,903	$ 10,730	$ 13,710	$ 92,422	$ 984	$ 1,163	$ 1,995,484	$ (1,484)	$ (257,738)
Balances (in shares) at Dec. 31, 2014	116,360,239							116,360,239
Issuance of common stock upon the exercise of options	970								970
Issuance of common stock upon the exercise of options (in shares)								41,634
Restricted stock grants issued	1							1
Restricted stock grants issued (in shares)								58,150
Restricted stock grants cancelled (in shares)								(1,864)
Compensation expense related to stock-based awards	1,142								1,142
Net income	58,636	1,668	629	458	171	1,966	2				53,742
Other comprehensive income	(6,593)	(46)				(231)				(6,316)
Tax effect from vesting of restricted stock grants and stock option exercises	644								644
Distributions to Operating Partnership units held by noncontrolling interests	(4,996)	(1,686)	(629)	(458)	(171)	(2,052)
Dividends paid on common stock at $0.47 per share	(54,732)										(54,732)
Balances at Mar. 31, 2015	$ 1,907,055	$ 14,745	$ 41,903	$ 10,730	$ 13,710	$ 92,105	$ 986	$ 1,164	$ 1,998,240	$ (7,800)	$ (258,728)
Balances (in shares) at Mar. 31, 2015	116,458,159							116,458,159

XML

Earnings Per Common Share - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jun. 21, 2013
Earnings Per Common Share [Line Items]
Average share price	$ 65.59
Average closing price of common stock	$ 67.57
Anti-dilutive securities excluded from computation of earnings per common share	875,480	989,980
Series A Units [Member]
Earnings Per Common Share [Line Items]
Exchangeable preferred operating partnership units settled in cash, minimum	$ 115,000
Series B Units [Member]
Earnings Per Common Share [Line Items]
Units outstanding	41,902
Anti-dilutive securities excluded from computation of earnings per common share	620,127
Series C Units [Member]
Earnings Per Common Share [Line Items]
Units outstanding	29,639
Anti-dilutive securities excluded from computation of earnings per common share	438,641
Series D Units [Member]
Earnings Per Common Share [Line Items]
Units outstanding	13,710
Anti-dilutive securities excluded from computation of earnings per common share	202,901
Operating Partnership [Member] | 2.375% Exchangeable Senior Notes [Member]
Earnings Per Common Share [Line Items]
Principal amount of notes issued	$ 250,000		$ 250,000
Interest rate	2.375%		2.375%
Exchange price	$ 55.62
Shares related to the Notes were included in the computation for diluted earnings per share	682,502	0
Stock Options [Member]
Earnings Per Common Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per common share	19,762	18,100

XML

Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Reclassifications

Reclassifications

Certain amounts in the Company’s 2014 consolidated financial statements and supporting note disclosures have been reclassified to conform to the current period presentation. Such reclassifications did not impact previously reported net income or accumulated deficit.

Recently Issued Accounting Standards

Recently Issued Accounting Standards

In April 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-08, “Presentation of Financial Statements (Topic 205) and Property, Plant and Equipment (Topic 360): Reporting Discontinued Operations and disclosures of Components of an Entity.” Under this guidance, only disposals representing a strategic shift in operations should be presented as discontinued operations. The guidance also requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. The Company adopted this guidance effective January 1, 2015. The Company has not previously had discontinued operations and as such, does not expect this guidance to have a significant impact on its consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which amends the guidance for revenue recognition to replace numerous, industry-specific requirements and converges areas under this topic with those of the International Financial Reporting Standards. ASU 2014-09 outlines a five-step process for customer contract revenue recognition that focuses on transfer of control, as opposed to transfer of risk and rewards. The amendment also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. ASU 2014-09 is effective for reporting periods beginning after December 15, 2016, and early adoption is prohibited. Entities can transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. Management is currently assessing the impact of the adoption of ASU 2014-09 on the Company’s condensed consolidated financial statements.

In June 2014, the FASB issued ASU 2014-12, “Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period,” which requires a reporting entity to treat a performance target that affects vesting, and that could be achieved after the requisite service period, as a performance condition. ASU 2014-12 is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2015. Early adoption is permitted. ASU 2014-12 may be adopted either prospectively for share-based payment awards granted or modified on or after the effective date, or retrospectively, using a modified retrospective approach. The modified retrospective approach would apply to share-based payment awards outstanding as of the beginning of the earliest annual period presented in the financial statements on adoption, and to all new or modified awards thereafter. The Company does not expect the adoption of ASU 2014-12 to have a material impact on its consolidated financial statements.

In February 2015, the FASB issued ASU 2015-02, “Consolidation (Topic 810): Amendments to the Consolidation Analysis.” This guidance is effective for annual reporting periods beginning after December 15, 2015, including interim periods within that reporting period. ASU 2015-02 amends the criteria for determining if a service provider possesses a variable interest in a VIE, and eliminates the presumption that a general partner should consolidate a limited partnership. The Company does not expect the adoption of this standard to materially impact its consolidated financial statements.

In April 2015, the FASB issued ASU 2015-03, “Interest—Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs.” This guidance requires debt issuance costs related to a recognized debt liability to be presented as a direct deduction from the carrying amount of that debt liability. The new guidance will only impact financial statement presentation. The guidance is effective in the first quarter of 2016 and allows for early adoption. The Company does not expect the adoption of this standard to materially impact its consolidated financial statements.

Fair Value Disclosures

Derivative Financial Instruments

Currently, the Company uses interest rate swaps to manage its interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash payments and the discounted expected variable cash receipts. The variable cash receipts are based on an expectation of future interest rates (forward curves) derived from observable market interest rate forward curves.

The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts and guarantees. In conjunction with the Financial Accounting Standards Board’s fair value measurement guidance, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.

Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. However, as of March 31, 2015, the Company had assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and determined that the credit valuation adjustments were not significant to the overall valuation of its derivatives. As a result, the Company determined that its derivative valuations in their entirety were classified in Level 2 of the fair value hierarchy.

The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis as of March 31, 2015, aggregated by the level in the fair value hierarchy within which those measurements fall.

	March 31, 2015			Fair Value Measurements at Reporting Date Using
Description				Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Other assets—Cash Flow Hedge Swap Agreements	$	688		$	—	$	688		$	—
Other liabilities—Cash Flow Hedge Swap Agreements	$	(7,231	)	$	—	$	(7,231	)	$	—

There were no transfers of assets and liabilities between Level 1 and Level 2 during the three months ended March 31, 2015. The Company did not have any significant assets or liabilities that are re-measured on a recurring basis using significant unobservable inputs as of March 31, 2015 or December 31, 2014.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

Long-lived assets held for use are evaluated for impairment when events or circumstances indicate there may be impairment. The Company reviews each store at least annually to determine if any such events or circumstances have occurred or exist. The Company focuses on stores where occupancy and/or rental income have decreased by a significant amount. For these stores, the Company determines whether the decrease is temporary or permanent, and whether the store will likely recover the lost occupancy and/or revenue in the short term. In addition, the Company carefully reviews stores in the lease-up stage and compares actual operating results to original projections.

When the Company determines that an event that may indicate impairment has occurred, the Company compares the carrying value of the related long-lived assets to the undiscounted future net operating cash flows attributable to the assets. An impairment loss is recorded if the net carrying value of the assets exceeds the undiscounted future net operating cash flows attributable to the assets. The impairment loss recognized equals the excess of net carrying value over the related fair value of the assets.

When real estate assets are identified by management as held for sale, the Company discontinues depreciating the assets and estimates the fair value of the assets, net of selling costs. If the estimated fair value, net of selling costs, of the assets that have been identified as held for sale is less than the net carrying value of the assets, a valuation allowance is established. The operations of assets held for sale or sold during the period are presented as part of normal operations for all periods presented.

The Company assesses whether there are any indicators that the value of the Company’s investments in unconsolidated real estate ventures may be impaired annually and when events or circumstances indicate that there may be impairment. An investment is impaired if management’s estimate of the fair value of the investment is less than its carrying value. To the extent impairment has occurred, and is considered to be other than temporary, the loss is measured as the excess of the carrying amount of the investment over the fair value of the investment.

In connection with the Company’s acquisition of stores, the purchase price is allocated to the tangible and intangible assets and liabilities acquired based on their fair values, which are estimated using significant unobservable inputs. The value of the tangible assets, consisting of land and buildings, is determined as if vacant. Intangible assets, which represent the value of existing tenant relationships, are recorded at their fair values based on the avoided cost to replace the current leases. The Company measures the value of tenant relationships based on the rent lost due to the amount of time required to replace existing customers, which is based on the Company’s historical experience with turnover in its stores. Debt assumed as part of an acquisition is recorded at fair value based on current interest rates compared to contractual rates. Acquisition-related transaction costs are expensed as incurred.

Fair Value of Financial Instruments

The carrying values of cash and cash equivalents, restricted cash, receivables, other financial instruments included in other assets, accounts payable and accrued expenses, variable-rate notes payable, lines of credit and other liabilities reflected in the condensed consolidated balance sheets at March 31, 2015 and December 31, 2014 approximate fair value.

The fair values of the Company’s notes receivable from Preferred Operating Partnership unit holders were based on the discounted estimated future cash flows of the notes (categorized within Level 3 of the fair value hierarchy); the discount rate used approximated the current market rate for loans with similar maturities and credit quality. The fair values of the Company’s fixed-rate notes payable and notes payable to trusts were estimated using the discounted estimated future cash payments to be made on such debt (categorized within Level 3 of the fair value hierarchy); the discount rates used approximated current market rates for loans, or groups of loans, with similar maturities and credit quality. The fair value of the Company’s exchangeable senior notes was estimated using an average market price for similar securities obtained from a third party.

The fair values of the Company’s fixed-rate assets and liabilities were as follows for the periods indicated:

	March 31, 2015				December 31, 2014
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	129,102	$	120,230	$	126,380	$	120,230
Fixed rate notes payable and notes payable to trusts	$	1,487,014	$	1,438,400	$	1,320,370	$	1,283,893
Exchangeable senior notes	$	310,625	$	250,000	$	276,095	$	250,000

Earnings Per Common Share

Basic earnings per common share is computed using the two-class method by dividing net income attributable to common stockholders by the weighted average number of common shares outstanding during the period. All outstanding unvested restricted stock awards contain rights to non-forfeitable dividends and participate in undistributed earnings with common stockholders; accordingly, they are considered participating securities that are included in the two-class method. Diluted earnings per common share measures the performance of the Company over the reporting period while giving effect to all potential common shares that were dilutive and outstanding during the period. The denominator includes the weighted average number of basic shares and the number of additional common shares that would have been outstanding if the potential common shares that were dilutive had been issued, and is calculated using either the two-class, treasury stock or as if-converted method, whichever is most dilutive. Potential common shares are securities (such as options, convertible debt, Series A Participating Redeemable Preferred Units (“Series A Units”), Series B Redeemable Preferred Units (“Series B Units”), Series C Convertible Redeemable Preferred Units (“Series C Units”), Series D Redeemable Preferred Units (“Series D Units”) and common Operating Partnership units (“OP Units”)) that do not have a current right to participate in earnings of the Company but could do so in the future by virtue of their option, redemption or conversion right.

In computing the dilutive effect of convertible securities, net income is adjusted to add back any changes in earnings in the period associated with the convertible security. The numerator also is adjusted for the effects of any other non-discretionary changes in income or loss that would result from the assumed conversion of those potential common shares. In computing diluted earnings per common share, only potential common shares that are dilutive (those that reduce earnings per common share) are included. For the three months ended March 31, 2015 and 2014, options to purchase approximately 19,762 and 18,100 shares of common stock, respectively, were excluded from the computation of earnings per share as their effect would have been anti-dilutive.

The following table presents the number of Preferred Operating Partnership units, and the potential common shares, that were excluded from the computation of earnings per share as their effect would have been anti-dilutive, assuming full conversion at the average share price for the quarter of $65.59.

	For the Three Months Ended March 31,
	2015				2014
	Number of Units		Equivalent Shares (if converted)		Number of Units		Equivalent Shares (if converted)
Series B Units		1,676,087		638,850		1,342,727		724,232
Series C Units		704,016		451,884		407,996		370,585
Series D Units		548,390		209,022		—		—
		2,928,493		1,299,756		1,750,723		1,094,817

The Operating Partnership had $250,000 of its 2.375% Exchangeable Senior Notes due 2033 (the “Notes”) issued and outstanding as of March 31, 2015. The Notes could potentially have a dilutive impact on the Company’s earnings per share calculations. The Notes are exchangeable by holders into shares of the Company’s common stock under certain circumstances per the terms of the indenture governing the Notes. The exchange price of the Notes was $55.62 per share as of March 31, 2015, and could change over time as described in the indenture. The Company has irrevocably agreed to pay only cash for the accreted principal amount of the Notes relative to its exchange obligations, but retained the right to satisfy the exchange obligation in excess of the accreted principal amount in cash and/or common stock.

Though the Company has retained that right, Accounting Standards Codification (“ASC”) 260, “Earnings per Share,” requires an assumption that shares would be used to pay the exchange obligation in excess of the accreted principal amount, and requires that those shares be included in the Company’s calculation of weighted average common shares outstanding for the diluted earnings per share computation. For the three months ended March 31, 2015, 682,502 shares related to the Notes were included in the computation for diluted earnings per share. For the three months ended March 31, 2014, no shares related to the Notes were included in the computation for diluted earnings per share as the exchange price exceeded the per share price of the Company’s common stock during this period.

For the purposes of computing the diluted impact on earnings per share of the potential exchange of Series A Units for common shares upon redemption, where the Company has the option to redeem in cash or shares and where the Company has stated the positive intent and ability to settle at least $115,000 of the instrument in cash (or net settle a portion of the Series A Units against the related outstanding note receivable), only the amount of the instrument in excess of $115,000 is considered in the calculation of shares contingently issuable for the purposes of computing diluted earnings per share as allowed by ASC 260-10-45-46.

For the purposes of computing the diluted impact on earnings per share of the potential exchange of Series B Units for common shares upon redemption, where the Company has the option to redeem in cash or shares and where the Company has stated the intent and ability to settle the redemption in shares, the Company divided the total value of the Series B Units outstanding as of March 31, 2015 of $41,902 by the closing price of the Company’s common stock as of March 31, 2015 of $67.57 per share. Assuming full exchange for common shares as of March 31, 2015, 620,127 shares would have been issued to the holders of the Series B Units.

For the purposes of computing the diluted impact on earnings per share of the potential exchange of Series C Units for common shares upon redemption, where the Company has the option to redeem in cash or shares and where the Company has stated the intent and ability to settle the redemption in shares, the Company divided the total value of the Series C Units outstanding as of March 31, 2015 of $29,639 by the closing price of the Company’s common stock as of March 31, 2015 of $67.57 per share. Assuming full exchange for common shares as of March 31, 2015, 438,641 shares would have been issued to the holders of the Series C Units.

For the purposes of computing the diluted impact on earnings per share of the potential exchange of Series D Units for common shares upon redemption, where the Company has the option to redeem in cash or shares and where the Company has stated the intent and ability to settle the redemption in shares, the Company divided the total value of the Series D Units outstanding as of March 31, 2015 of $13,710 by the closing price of the Company’s common stock as of March 31, 2015 of $67.57 per share. Assuming full exchange for common shares as of March 31, 2015, 202,901 shares would have been issued to the holders of Series D Units.

The computation of earnings per common share was as follows for the periods presented:

	For the Three Months Ended March 31,
	2015			2014
Net income attributable to common stockholders	$	53,742		$	37,340
Earnings and dividends allocated to participating securities		(119	)		(117	)
Earnings for basic computations		53,623			37,223
Earnings and dividends allocated to participating securities		119			—
Income allocated to noncontrolling interest—Preferred Operating Partnership (Series A Units) and Operating Partnership		3,635			3,128
Fixed component of income allocated to noncontrolling interest—Preferred Operating Partnership (Series A Units)		(1,274	)		(1,438	)
Net income for diluted computations	$	56,103		$	38,913
Weighted average common shares outstanding:
Average number of common shares outstanding—basic		116,117,615			115,438,325
Series A Units		875,480			989,980
OP Units		4,365,879			4,334,118
Unvested restricted stock awards included for treasury stock method		282,903			—
Shares related to exchangeable senior notes and dilutive stock options		953,841			300,422
Average number of common shares outstanding—diluted		122,595,718			121,062,845
Earnings per common share
Basic	$	0.46		$	0.32
Diluted	$	0.46		$	0.32

Derivatives

DERIVATIVES

The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity and credit risk, primarily by managing the amount, sources and duration of its debt funding and by using derivative financial instruments. Specifically, the Company enters into derivative financial instruments to manage exposure that arises from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s investments and borrowings.

Convertible Debt

GAAP requires entities with convertible debt instruments that may be settled entirely or partially in cash upon conversion to separately account for the liability and equity components of the instrument in a manner that reflects the issuer’s economic interest cost. The Company therefore accounts for the liability and equity components of the Notes separately. The equity component is included in additional paid-in capital in stockholders’ equity in the condensed consolidated balance sheets, and the value of the equity component is treated as original issue discount for purposes of accounting for the debt component. The discount is being amortized as interest expense over the remaining period of the debt through its first redemption date, July 1, 2018. The effective interest rate on the liability component is 4.0%.

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Earnings Per Common Share - Schedule of Computation of Earnings Per Common Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net income attributable to common stockholders	$ 53,742	$ 37,340
Earnings and dividends allocated to participating securities	(119)	(117)
Earnings for basic computations	53,623	37,223
Earnings and dividends allocated to participating securities	119
Income allocated to noncontrolling interest-Preferred Operating Partnership (Series A Units) and Operating Partnership	3,635	3,128
Fixed component of income allocated to noncontrolling interest-Preferred Operating Partnership (Series A Units)	(1,274)	(1,438)
Net income for diluted computations	$ 56,103	$ 38,913
Weighted average common shares outstanding:
Average number of common shares outstanding-basic	116,117,615	115,438,325
Series A Units	875,480	989,980
OP Units	4,365,879	4,334,118
Unvested restricted stock awards included for treasury stock method	282,903
Shares related to exchangeable senior notes and dilutive stock options	953,841	300,422
Average number of common shares outstanding-diluted	122,595,718	121,062,845
Earnings per common share
Basic	$ 0.46	$ 0.32
Diluted	$ 0.46	$ 0.32

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Earnings Per Common Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Schedule of Antidilutive Shares Excluded from Computation of Earnings Per Share

The following table presents the number of Preferred Operating Partnership units, and the potential common shares, that were excluded from the computation of earnings per share as their effect would have been anti-dilutive, assuming full conversion at the average share price for the quarter of $65.59.

	For the Three Months Ended March 31,
	2015				2014
	Number of Units		Equivalent Shares (if converted)		Number of Units		Equivalent Shares (if converted)
Series B Units		1,676,087		638,850		1,342,727		724,232
Series C Units		704,016		451,884		407,996		370,585
Series D Units		548,390		209,022		—		—
		2,928,493		1,299,756		1,750,723		1,094,817

Schedule of Computation of Earnings Per Common Share

The computation of earnings per common share was as follows for the periods presented:

	For the Three Months Ended March 31,
	2015			2014
Net income attributable to common stockholders	$	53,742		$	37,340
Earnings and dividends allocated to participating securities		(119	)		(117	)
Earnings for basic computations		53,623			37,223
Earnings and dividends allocated to participating securities		119			—
Income allocated to noncontrolling interest—Preferred Operating Partnership (Series A Units) and Operating Partnership		3,635			3,128
Fixed component of income allocated to noncontrolling interest—Preferred Operating Partnership (Series A Units)		(1,274	)		(1,438	)
Net income for diluted computations	$	56,103		$	38,913
Weighted average common shares outstanding:
Average number of common shares outstanding—basic		116,117,615			115,438,325
Series A Units		875,480			989,980
OP Units		4,365,879			4,334,118
Unvested restricted stock awards included for treasury stock method		282,903			—
Shares related to exchangeable senior notes and dilutive stock options		953,841			300,422
Average number of common shares outstanding—diluted		122,595,718			121,062,845
Earnings per common share
Basic	$	0.46		$	0.32
Diluted	$	0.46		$	0.32

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Condensed Consolidated Statement of Noncontrolling Interests and Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Stockholders' Equity [Abstract]
Dividends paid on common stock, per share	$ 0.47	$ 0.40

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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	116,458,159	116,360,239
Common stock, shares outstanding	116,458,159	116,360,239
Note receivable from noncontrolling interest represented by Preferred Operating Partnership units	$ 120,230	$ 120,230

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Noncontrolling Interests

3 Months Ended

Mar. 31, 2015

Noncontrolling Interests

11. OTHER NONCONTROLLING INTERESTS

Other noncontrolling interests represent the ownership interests of various third parties in two consolidated joint ventures as of March 31, 2015. One of these consolidated joint ventures owns a single store in California. The second consolidated joint venture owns 19 stores. The ownership interests of the third-party owners range from 1.0% to 3.3%. Other noncontrolling interests are included in the stockholders’ equity section of the Company’s condensed consolidated balance sheets. The income or losses attributable to these third-party owners based on their ownership percentages are reflected in net income allocated to Operating Partnership and other noncontrolling interests in the condensed consolidated statements of operations.

Preferred Operating Partnership Units [Member]

Noncontrolling Interests

9. NONCONTROLLING INTEREST REPRESENTED BY PREFERRED OPERATING PARTNERSHIP UNITS

Classification of Noncontrolling Interests

GAAP requires a company to present ownership interests in subsidiaries held by parties other than the company in the consolidated financial statements within the equity section, but separate from the company’s equity. It also requires the amount of consolidated net income attributable to the parent and to the noncontrolling interest to be clearly identified and presented on the face of the consolidated statement of operations and requires changes in ownership interest to be accounted for similarly as equity transactions. If noncontrolling interests are determined to be redeemable, they are to be carried at their redemption value as of the balance sheet date and reported as temporary equity.

The Company has evaluated the terms of the Operating Partnership’s preferred units and classifies the noncontrolling interest represented by such preferred units as stockholders’ equity in the accompanying condensed consolidated balance sheets. The Company will periodically evaluate individual noncontrolling interests for the ability to continue to recognize the noncontrolling interest as permanent equity in the condensed consolidated balance sheets. Any noncontrolling interests that fail to qualify as permanent equity will be reclassified as temporary equity and adjusted to the greater of (1) the carrying amount and (2) the redemption value as of the end of the period in which the determination is made.

Series A Participating Redeemable Preferred Units

On June 15, 2007, the Operating Partnership entered into a Contribution Agreement with various limited partnerships affiliated with AAAAA Rent-A-Space to acquire ten stores in exchange for 989,980 Series A Units of the Operating Partnership. The stores are located in California and Hawaii.

On June 25, 2007, the Operating Partnership loaned the holders of the Series A Units $100,000. The note receivable bears interest at 4.85% per annum. During 2013, a loan amendment was signed extending the maturity date to September 1, 2020. The loan is secured by the borrower’s Series A Units. The holders of the Series A Units could redeem up to 114,500 Series A Units prior to the maturity date of the loan. If any redemption in excess of 114,500 Series A Units occurs prior to the maturity date, the holder of the Series A Units is required to repay the loan as of the date of that redemption.

The partnership agreement of the Operating Partnership (as amended, the “Partnership Agreement”) provides for the designation and issuance of the Series A Units. The Series A Units will have priority over all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

Under the Partnership Agreement, Series A Units in the amount of $115,000 bear a fixed priority return of 5% and have a fixed liquidation value of $115,000. The remaining balance participates in distributions with, and has a liquidation value equal to, that of the OP Units. The Series A Units are redeemable at the option of the holder, which redemption obligation may be satisfied, at the Company’s option, in cash or shares of its common stock.

On October 3, 2014, the holders of the Series A Units redeemed 114,500 Series A Units for $4,794 in cash and 280,331 shares of common stock. No additional redemption of Series A Units can be made without repayment of the loan. Subsequent to this redemption, the fixed priority return is calculated using the current liquidation value of $101,699. The Series A Units are shown on the balance sheet net of the $100,000 loan because the borrower under the loan receivable is also the holder of the Series A Units.

Series B Redeemable Preferred Units

On April 3, 2014, the Operating Partnership completed the purchase of a store located in Georgia. This store was acquired in exchange for $15,158 of cash and 333,360 Series B Units valued at $8,334.

On August 29, 2013, the Operating Partnership completed the purchase of 19 out of 20 stores affiliated with All Aboard Mini Storage, all of which are located in California. On September 26, 2013, the Operating Partnership completed the purchase of the remaining store. These stores were acquired in exchange for $100,876 of cash (including $98,960 of debt assumed and immediately defeased at closing), 1,342,727 Series B Units valued at $33,568, and 1,448,108 OP Units valued at $62,341.

The Partnership Agreement provides for the designation and issuance of the Series B Units. The Series B Units rank junior to the Series A Units, on parity with the Series C Units, and senior to all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

The outstanding Series B Units have a liquidation value of $25.00 per unit for a fixed liquidation value of $41,902. Holders of the Series B Units receive distributions at an annual rate of 6%. These distributions are cumulative. The Series B Units will become redeemable at the option of the holder on the first anniversary of the date of issuance, which redemption obligation may be satisfied at the Company’s option in cash or shares of its common stock.

Series C Convertible Redeemable Preferred Units

On November 19, 2013, the Company entered into Contribution Agreements with various entities affiliated with Grupe Properties Co. Inc. (“Grupe”), under which the Company agreed to acquire twelve stores, all of which are located in California. The Company completed the purchase of these stores between December 2013 and May 2014. The Company previously held 35% interests in five of these stores and a 40% interest in one store through six separate joint ventures with Grupe. These stores were acquired in exchange for a total of approximately $45,722 of cash, the assumption of $37,532 in existing debt, and the issuance of 704,016 Series C Units valued at $30,960.

The Partnership Agreement provides for the designation and issuance of the Series C Units. The Series C Units rank junior to the Series A Units, on parity with the Series B Units, and senior to all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

The outstanding Series C Units have a liquidation value of $42.10 per unit for a fixed liquidation value of $29,639. From issuance to the fifth anniversary of issuance, each Series C Unit holder will receive quarterly distributions equal to the quarterly distribution per OP Unit plus $0.18. Beginning on the fifth anniversary of issuance, each Series C Unit holder will receive a fixed quarterly distribution equal to the aggregate quarterly distribution payable in respect of such Series C Unit during the four quarters immediately preceding the fifth anniversary of issuance, divided by four. These distributions are cumulative. The Series C Units will become redeemable at the option of the holder one year from the date of issuance, which redemption obligation may be satisfied at the Company’s option in cash or shares of its common stock. The Series C Units will also become convertible into OP Units at the option of the holder one year from the date of issuance, at a rate of 0.9145 OP Units per Series C Unit converted. This conversion option expires upon the fifth anniversary of the date of issuance.

In December 2014, the Operating Partnership loaned certain holders of the Series C Units $20,230. The notes receivable, which are collateralized by the Series C Units, bear interest at 5.0% per annum and mature on December 15, 2024. The Series C Units are shown on the balance sheet net of the $20,230 loan because the borrower under the loan receivable is also the holder of the Series C units.

Series D Redeemable Preferred Units

In December 2014, the Operating Partnership completed the acquisition of a store located in Florida. This store was acquired in exchange for $5,621 in cash and 548,390 Series D Units valued at $13,710.

The Partnership Agreement provides for the designation and issuance of the Series D Units. The Series D Units rank junior to the Series A Units, on parity with the Series B Units and Series C Units, and senior to all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

The Series D Units have a liquidation value of $25.00 per unit, for a fixed liquidation value of $13,710. Holders of the Series D Units receive distributions at an annual rate of 5.0%. These distributions are cumulative. The Series D Units will become redeemable at the option of the holder on the first anniversary of the date of issuance, which redemption obligation may be satisfied at the Company’s option in cash or shares of its common stock.

Common Operating Partnership [Member]

Noncontrolling Interests

10. NONCONTROLLING INTEREST IN OPERATING PARTNERSHIP

The Company’s interest in its stores is held through the Operating Partnership. ESS Holding Business Trust I, a wholly-owned subsidiary of the Company, is the sole general partner of the Operating Partnership. ESS Holding Business Trust II, also a wholly-owned subsidiary of the Company, is a limited partner of the Operating Partnership. Between its general partner and limited partner interests, the Company held a 93.4% ownership interest in the Operating Partnership as of March 31, 2015. The remaining ownership interests in the Operating Partnership (including Preferred Operating Partnership units) of 6.6% are held by certain former owners of assets acquired by the Operating Partnership.

The noncontrolling interest in the Operating Partnership represents OP Units that are not owned by the Company. In conjunction with the formation of the Company, and as a result of subsequent acquisitions, certain persons and entities contributing interests in stores to the Operating Partnership received limited partnership interests in the form of OP Units. Limited partners who received OP Units in the formation transactions or in exchange for contributions for interests in stores have the right to require the Operating Partnership to redeem part or all of their OP Units for cash based upon the fair market value of an equivalent number of shares of the Company’s common stock (based on the ten-day average trading price) at the time of the redemption. Alternatively, the Company may, in its sole discretion, elect to acquire those OP Units in exchange for shares of its common stock on a one-for-one basis, subject to anti-dilution adjustments provided in the Partnership Agreement. The ten-day average closing stock price at March 31, 2015 was $67.76 and there were 4,365,879 OP Units outstanding. Assuming that all of the OP Unit holders exercised their right to redeem all of their OP Units on March 31, 2015 and the Company elected to pay the OP Unit holders cash, the Company would have paid $295,832 in cash consideration to redeem the units.

GAAP requires a company to present ownership interests in subsidiaries held by parties other than the company in the consolidated financial statements within the equity section, but separate from the company’s equity. It also requires the amount of consolidated net income attributable to the parent and to the noncontrolling interest to be clearly identified and presented on the face of the consolidated statement of operations, and requires changes in ownership interest to be accounted for similarly as equity transactions. If noncontrolling interests are determined to be redeemable, they are to be carried at their redemption value as of the balance sheet date and reported as temporary equity.

The Company has evaluated the terms of the OP Units and classifies the noncontrolling interest represented by the OP Units as stockholders’ equity in the accompanying condensed consolidated balance sheets. The Company will periodically evaluate individual noncontrolling interests for the ability to continue to recognize the noncontrolling amount as permanent equity in the condensed consolidated balance sheets. Any noncontrolling interests that fail to qualify as permanent equity will be reclassified as temporary equity and adjusted to the greater of (1) the carrying amount and (2) the redemption value as of the end of the period in which the determination is made.

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Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	EXR
Entity Registrant Name	Extra Space Storage Inc.
Entity Central Index Key	0001289490
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		116,494,142

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Equity in Earnings of Unconsolidated Real Estate Ventures - Gain on Sale of Real Estate and Purchase of Joint Venture Partners' Interests

3 Months Ended

Mar. 31, 2015

Equity Method Investments and Joint Ventures [Abstract]

Equity in Earnings of Unconsolidated Real Estate Ventures - Gain on Sale of Real Estate and Purchase of Joint Venture Partners' Interests

12. EQUITY IN EARNINGS OF UNCONSOLIDATED REAL ESTATE VENTURES—GAIN ON SALE OF REAL ESTATE AND PURCHASE OF JOINT VENTURE PARTNERS’ INTERESTS

In March 2015, ESS PRISA II LLC (“PRISA II”), a joint venture in which the Company holds a 2.0% interest, sold one store located in New York for $90,000. As a result of the sale, PRISA II recognized a gain of $60,496 and the Company recorded its 2.0% portion of the gain, or $1,228.

In March 2015, the Company acquired its joint venture partner’s 82.4% interest in Sacramento One, an existing joint venture which owned one store located in California, for $1,700. In addition, the Company held mortgage notes receivable from Sacramento One totaling $11,009, which were eliminated as a result of the acquisition. Prior to the acquisition, the remaining 17.6% interest was owned by the Company, which accounted for its investment in Sacramento One using the equity method. The Company recorded a non-cash gain of $1,629 related to this transaction, which represents the increase in fair value of the company’s interest in the joint venture from its formation to the acquisition date.

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Condensed Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Property rental	$ 148,894	$ 132,001
Tenant reinsurance	16,510	13,463
Management fees and other income	7,750	7,123
Total revenues	173,154	152,587
Expenses:
Property operations	47,244	43,482
Tenant reinsurance	2,928	2,567
Acquisition related costs	869	2,056
General and administrative	16,249	15,709
Depreciation and amortization	30,428	28,375
Total expenses	97,718	92,189
Income from operations	75,436	60,398
Interest expense	(21,431)	(19,598)
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	(697)	(662)
Interest income	856	269
Interest income on note receivable from Preferred Operating Partnership unit holder	1,213	1,213
Income before equity in earnings of unconsolidated real estate ventures and income tax expense	55,377	41,620
Equity in earnings of unconsolidated real estate ventures	2,650	2,419
Equity in earnings of unconsolidated real estate ventures-gain on sale of real estate assets and purchase of joint venture partners' interests	2,857
Income tax expense	(2,248)	(2,830)
Net income	58,636	41,209
Net income allocated to Preferred Operating Partnership noncontrolling interests	(2,926)	(2,492)
Net income allocated to Operating Partnership and other noncontrolling interests	(1,968)	(1,377)
Net income attributable to common stockholders	$ 53,742	$ 37,340
Earnings per common share
Basic	$ 0.46	$ 0.32
Diluted	$ 0.46	$ 0.32
Weighted average number of shares
Basic	116,117,615	115,438,325
Diluted	122,595,718	121,062,845
Cash dividends paid per common share	$ 0.47	$ 0.40

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Earnings Per Common Share

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Earnings Per Common Share

4. EARNINGS PER COMMON SHARE

Basic earnings per common share is computed using the two-class method by dividing net income attributable to common stockholders by the weighted average number of common shares outstanding during the period. All outstanding unvested restricted stock awards contain rights to non-forfeitable dividends and participate in undistributed earnings with common stockholders; accordingly, they are considered participating securities that are included in the two-class method. Diluted earnings per common share measures the performance of the Company over the reporting period while giving effect to all potential common shares that were dilutive and outstanding during the period. The denominator includes the weighted average number of basic shares and the number of additional common shares that would have been outstanding if the potential common shares that were dilutive had been issued, and is calculated using either the two-class, treasury stock or as if-converted method, whichever is most dilutive. Potential common shares are securities (such as options, convertible debt, Series A Participating Redeemable Preferred Units (“Series A Units”), Series B Redeemable Preferred Units (“Series B Units”), Series C Convertible Redeemable Preferred Units (“Series C Units”), Series D Redeemable Preferred Units (“Series D Units”) and common Operating Partnership units (“OP Units”)) that do not have a current right to participate in earnings of the Company but could do so in the future by virtue of their option, redemption or conversion right.

In computing the dilutive effect of convertible securities, net income is adjusted to add back any changes in earnings in the period associated with the convertible security. The numerator also is adjusted for the effects of any other non-discretionary changes in income or loss that would result from the assumed conversion of those potential common shares. In computing diluted earnings per common share, only potential common shares that are dilutive (those that reduce earnings per common share) are included. For the three months ended March 31, 2015 and 2014, options to purchase approximately 19,762 and 18,100 shares of common stock, respectively, were excluded from the computation of earnings per share as their effect would have been anti-dilutive.

The following table presents the number of Preferred Operating Partnership units, and the potential common shares, that were excluded from the computation of earnings per share as their effect would have been anti-dilutive, assuming full conversion at the average share price for the quarter of $65.59.

	For the Three Months Ended March 31,
	2015				2014
	Number of Units		Equivalent Shares (if converted)		Number of Units		Equivalent Shares (if converted)
Series B Units		1,676,087		638,850		1,342,727		724,232
Series C Units		704,016		451,884		407,996		370,585
Series D Units		548,390		209,022		—		—
		2,928,493		1,299,756		1,750,723		1,094,817

The Operating Partnership had $250,000 of its 2.375% Exchangeable Senior Notes due 2033 (the “Notes”) issued and outstanding as of March 31, 2015. The Notes could potentially have a dilutive impact on the Company’s earnings per share calculations. The Notes are exchangeable by holders into shares of the Company’s common stock under certain circumstances per the terms of the indenture governing the Notes. The exchange price of the Notes was $55.62 per share as of March 31, 2015, and could change over time as described in the indenture. The Company has irrevocably agreed to pay only cash for the accreted principal amount of the Notes relative to its exchange obligations, but retained the right to satisfy the exchange obligation in excess of the accreted principal amount in cash and/or common stock.

Though the Company has retained that right, Accounting Standards Codification (“ASC”) 260, “Earnings per Share,” requires an assumption that shares would be used to pay the exchange obligation in excess of the accreted principal amount, and requires that those shares be included in the Company’s calculation of weighted average common shares outstanding for the diluted earnings per share computation. For the three months ended March 31, 2015, 682,502 shares related to the Notes were included in the computation for diluted earnings per share. For the three months ended March 31, 2014, no shares related to the Notes were included in the computation for diluted earnings per share as the exchange price exceeded the per share price of the Company’s common stock during this period.

For the purposes of computing the diluted impact on earnings per share of the potential exchange of Series A Units for common shares upon redemption, where the Company has the option to redeem in cash or shares and where the Company has stated the positive intent and ability to settle at least $115,000 of the instrument in cash (or net settle a portion of the Series A Units against the related outstanding note receivable), only the amount of the instrument in excess of $115,000 is considered in the calculation of shares contingently issuable for the purposes of computing diluted earnings per share as allowed by ASC 260-10-45-46.

For the purposes of computing the diluted impact on earnings per share of the potential exchange of Series B Units for common shares upon redemption, where the Company has the option to redeem in cash or shares and where the Company has stated the intent and ability to settle the redemption in shares, the Company divided the total value of the Series B Units outstanding as of March 31, 2015 of $41,902 by the closing price of the Company’s common stock as of March 31, 2015 of $67.57 per share. Assuming full exchange for common shares as of March 31, 2015, 620,127 shares would have been issued to the holders of the Series B Units.

For the purposes of computing the diluted impact on earnings per share of the potential exchange of Series C Units for common shares upon redemption, where the Company has the option to redeem in cash or shares and where the Company has stated the intent and ability to settle the redemption in shares, the Company divided the total value of the Series C Units outstanding as of March 31, 2015 of $29,639 by the closing price of the Company’s common stock as of March 31, 2015 of $67.57 per share. Assuming full exchange for common shares as of March 31, 2015, 438,641 shares would have been issued to the holders of the Series C Units.

For the purposes of computing the diluted impact on earnings per share of the potential exchange of Series D Units for common shares upon redemption, where the Company has the option to redeem in cash or shares and where the Company has stated the intent and ability to settle the redemption in shares, the Company divided the total value of the Series D Units outstanding as of March 31, 2015 of $13,710 by the closing price of the Company’s common stock as of March 31, 2015 of $67.57 per share. Assuming full exchange for common shares as of March 31, 2015, 202,901 shares would have been issued to the holders of Series D Units.

The computation of earnings per common share was as follows for the periods presented:

	For the Three Months Ended March 31,
	2015			2014
Net income attributable to common stockholders	$	53,742		$	37,340
Earnings and dividends allocated to participating securities		(119	)		(117	)
Earnings for basic computations		53,623			37,223
Earnings and dividends allocated to participating securities		119			—
Income allocated to noncontrolling interest—Preferred Operating Partnership (Series A Units) and Operating Partnership		3,635			3,128
Fixed component of income allocated to noncontrolling interest—Preferred Operating Partnership (Series A Units)		(1,274	)		(1,438	)
Net income for diluted computations	$	56,103		$	38,913
Weighted average common shares outstanding:
Average number of common shares outstanding—basic		116,117,615			115,438,325
Series A Units		875,480			989,980
OP Units		4,365,879			4,334,118
Unvested restricted stock awards included for treasury stock method		282,903			—
Shares related to exchangeable senior notes and dilutive stock options		953,841			300,422
Average number of common shares outstanding—diluted		122,595,718			121,062,845
Earnings per common share
Basic	$	0.46		$	0.32
Diluted	$	0.46		$	0.32

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Fair Value Disclosures

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Disclosures

3. FAIR VALUE DISCLOSURES

Derivative Financial Instruments

Currently, the Company uses interest rate swaps to manage its interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash payments and the discounted expected variable cash receipts. The variable cash receipts are based on an expectation of future interest rates (forward curves) derived from observable market interest rate forward curves.

The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts and guarantees. In conjunction with the Financial Accounting Standards Board’s fair value measurement guidance, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.

Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. However, as of March 31, 2015, the Company had assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and determined that the credit valuation adjustments were not significant to the overall valuation of its derivatives. As a result, the Company determined that its derivative valuations in their entirety were classified in Level 2 of the fair value hierarchy.

The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis as of March 31, 2015, aggregated by the level in the fair value hierarchy within which those measurements fall.

	March 31, 2015			Fair Value Measurements at Reporting Date Using
Description				Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Other assets—Cash Flow Hedge Swap Agreements	$	688		$	—	$	688		$	—
Other liabilities—Cash Flow Hedge Swap Agreements	$	(7,231	)	$	—	$	(7,231	)	$	—

There were no transfers of assets and liabilities between Level 1 and Level 2 during the three months ended March 31, 2015. The Company did not have any significant assets or liabilities that are re-measured on a recurring basis using significant unobservable inputs as of March 31, 2015 or December 31, 2014.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

Long-lived assets held for use are evaluated for impairment when events or circumstances indicate there may be impairment. The Company reviews each store at least annually to determine if any such events or circumstances have occurred or exist. The Company focuses on stores where occupancy and/or rental income have decreased by a significant amount. For these stores, the Company determines whether the decrease is temporary or permanent, and whether the store will likely recover the lost occupancy and/or revenue in the short term. In addition, the Company carefully reviews stores in the lease-up stage and compares actual operating results to original projections.

When the Company determines that an event that may indicate impairment has occurred, the Company compares the carrying value of the related long-lived assets to the undiscounted future net operating cash flows attributable to the assets. An impairment loss is recorded if the net carrying value of the assets exceeds the undiscounted future net operating cash flows attributable to the assets. The impairment loss recognized equals the excess of net carrying value over the related fair value of the assets.

When real estate assets are identified by management as held for sale, the Company discontinues depreciating the assets and estimates the fair value of the assets, net of selling costs. If the estimated fair value, net of selling costs, of the assets that have been identified as held for sale is less than the net carrying value of the assets, a valuation allowance is established. The operations of assets held for sale or sold during the period are presented as part of normal operations for all periods presented.

The Company assesses whether there are any indicators that the value of the Company’s investments in unconsolidated real estate ventures may be impaired annually and when events or circumstances indicate that there may be impairment. An investment is impaired if management’s estimate of the fair value of the investment is less than its carrying value. To the extent impairment has occurred, and is considered to be other than temporary, the loss is measured as the excess of the carrying amount of the investment over the fair value of the investment.

In connection with the Company’s acquisition of stores, the purchase price is allocated to the tangible and intangible assets and liabilities acquired based on their fair values, which are estimated using significant unobservable inputs. The value of the tangible assets, consisting of land and buildings, is determined as if vacant. Intangible assets, which represent the value of existing tenant relationships, are recorded at their fair values based on the avoided cost to replace the current leases. The Company measures the value of tenant relationships based on the rent lost due to the amount of time required to replace existing customers, which is based on the Company’s historical experience with turnover in its stores. Debt assumed as part of an acquisition is recorded at fair value based on current interest rates compared to contractual rates. Acquisition-related transaction costs are expensed as incurred.

Fair Value of Financial Instruments

The carrying values of cash and cash equivalents, restricted cash, receivables, other financial instruments included in other assets, accounts payable and accrued expenses, variable-rate notes payable, lines of credit and other liabilities reflected in the condensed consolidated balance sheets at March 31, 2015 and December 31, 2014 approximate fair value.

The fair values of the Company’s notes receivable from Preferred Operating Partnership unit holders were based on the discounted estimated future cash flows of the notes (categorized within Level 3 of the fair value hierarchy); the discount rate used approximated the current market rate for loans with similar maturities and credit quality. The fair values of the Company’s fixed-rate notes payable and notes payable to trusts were estimated using the discounted estimated future cash payments to be made on such debt (categorized within Level 3 of the fair value hierarchy); the discount rates used approximated current market rates for loans, or groups of loans, with similar maturities and credit quality. The fair value of the Company’s exchangeable senior notes was estimated using an average market price for similar securities obtained from a third party.

The fair values of the Company’s fixed-rate assets and liabilities were as follows for the periods indicated:

	March 31, 2015				December 31, 2014
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	129,102	$	120,230	$	126,380	$	120,230
Fixed rate notes payable and notes payable to trusts	$	1,487,014	$	1,438,400	$	1,320,370	$	1,283,893
Exchangeable senior notes	$	310,625	$	250,000	$	276,095	$	250,000

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Fair Value Disclosures (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis

The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis as of March 31, 2015, aggregated by the level in the fair value hierarchy within which those measurements fall.

	March 31, 2015			Fair Value Measurements at Reporting Date Using
Description				Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Other assets—Cash Flow Hedge Swap Agreements	$	688		$	—	$	688		$	—
Other liabilities—Cash Flow Hedge Swap Agreements	$	(7,231	)	$	—	$	(7,231	)	$	—

Schedule of Fair Value of Financial Instruments

The fair values of the Company’s fixed-rate assets and liabilities were as follows for the periods indicated:

	March 31, 2015				December 31, 2014
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	129,102	$	120,230	$	126,380	$	120,230
Fixed rate notes payable and notes payable to trusts	$	1,487,014	$	1,438,400	$	1,320,370	$	1,283,893
Exchangeable senior notes	$	310,625	$	250,000	$	276,095	$	250,000

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Segment Information

3 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Segment Information

13. SEGMENT INFORMATION

The Company operates in three distinct segments: (1) rental operations; (2) tenant reinsurance; and (3) property management, acquisition and development. Management fees collected for wholly-owned stores are eliminated in consolidation. Financial information for the Company’s business segments is presented below:

	March 31, 2015		December 31, 2014
Balance Sheet
Investment in unconsolidated real estate ventures
Rental operations	$	85,602	$	85,711
Total assets
Rental operations	$	4,194,744	$	4,109,673
Tenant reinsurance		38,745		39,383
Property management, acquisition and development		230,656		253,051
	$	4,464,145	$	4,402,107

	For the Three Months Ended March 31,
	2015			2014
Statement of Operations
Total revenues
Rental operations	$	148,894		$	132,001
Tenant reinsurance		16,510			13,463
Property management, acquisition and development		7,750			7,123
		173,154			152,587
Operating expenses, including depreciation and amortization
Rental operations		75,509			69,942
Tenant reinsurance		2,928			2,567
Property management, acquisition and development		19,281			19,680
		97,718			92,189
Income (loss) from operations
Rental operations		73,385			62,059
Tenant reinsurance		13,582			10,896
Property management, acquisition and development		(11,531	)		(12,557	)
		75,436			60,398
Interest expense
Rental operations		(21,830	)		(19,310	)
Property management, acquisition and development		399			(288	)
		(21,431	)		(19,598	)
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes
Property management, acquisition and development		(697	)		(662	)
Interest income
Tenant reinsurance		4			4
Property management, acquisition and development		852			265
		856			269
Interest income on note receivable from Preferred Operating Partnership unit holder
Property management, acquisition and development		1,213			1,213
Equity in earnings of unconsolidated real estate ventures
Rental operations		2,650			2,419
Equity in earnings of unconsolidated real estate ventures—gain on sale of real estate assets and purchase of partners’ interests
Rental operations		2,857			—
Income tax expense
Rental operations		(754	)		(434	)
Tenant reinsurance		(1,874	)		(3,815	)
Property management, acquisition and development		380			1,419
		(2,248	)		(2,830	)
Net income (loss)
Rental operations		56,308			44,734
Tenant reinsurance		11,712			7,085
Property management, acquisition and development		(9,384	)		(10,610	)
	$	58,636		$	41,209
Depreciation and amortization expense
Rental operations	$	28,265		$	26,460
Property management, acquisition and development		2,163			1,915
	$	30,428		$	28,375
Statement of Cash Flows
Acquisition of real estate assets
Property management, acquisition and development	$	(77,082	)	$	(253,939	)
Development and redevelopment of real estate assets
Property management, acquisition and development	$	(3,140	)	$	(2,820	)

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Derivatives

3 Months Ended

Mar. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

7. DERIVATIVES

The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity and credit risk, primarily by managing the amount, sources and duration of its debt funding and by using derivative financial instruments. Specifically, the Company enters into derivative financial instruments to manage exposure that arises from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s investments and borrowings.

Cash Flow Hedges of Interest Rate Risk

The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish these objectives, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in accumulated other comprehensive income (“OCI”) and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. A portion of these changes is excluded from accumulated other comprehensive income as it is allocated to noncontrolling interests. During the three months ended March 31, 2015 and 2014, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt.

The Company held 23 derivative financial instruments which had a total combined notional amount of $825,987 as of March 31, 2015.

Fair Values of Derivative Instruments

The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the condensed consolidated balance sheets:

	Asset (Liability) Derivatives
	March 31, 2015			December 31, 2014
Derivatives designated as hedging instruments:
Other assets	$	688		$	3,583
Other liabilities	$	(7,231	)	$	(3,533	)

Effect of Derivative Instruments

The tables below present the effect of the Company’s derivative financial instruments on the condensed consolidated statements of operations for the periods presented. No tax effect has been presented as the derivative instruments are held by the Company:

	Classification of Income (Expense)	For the Three Months Ended March 31,
Type		2015			2014
Swap Agreements	Interest expense	$	(2,297	)	$	(2,293	)

	Gain (loss) recognized in OCI March 31,						Location of amounts reclassified from OCI into income	Gain (loss) reclassifed from OCI For the Three Months Ended March 31,
Type	2015			2014				2015			2014
Swap Agreements	$	(8,875	)	$	(5,043	)	Interest expense	$	(2,297	)	$	(2,293	)

Credit-risk-related Contingent Features

The Company has agreements with some of its derivative counterparties that contain provisions pursuant to which the Company could be declared in default of its derivative obligations if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender.

The Company also has an agreement with some of its derivative counterparties that incorporates the loan covenant provisions of the Company’s indebtedness with a lender affiliate of the derivative counterparty. Failure to comply with the loan covenant provisions would result in the Company being in default on any derivative instrument obligations covered by the agreement.

As of March 31, 2015, the Company had not posted any collateral related to these agreements. If the Company had breached any of these provisions as of March 31, 2015, it could have been required to settle its obligations under the agreements at their termination value of $7,740, including accrued interest.

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Store Acquisitions

3 Months Ended

Mar. 31, 2015

Business Combinations [Abstract]

Store Acquisitions

5. STORE ACQUISITIONS

The following table summarizes the Company’s acquisitions of operating stores for the three months ended March 31, 2015, and does not include purchases of raw land or improvements made to existing assets:

	Number of Stores		Date of Acquisition		Consideration Paid														Acquisition Date Fair Value
Property Location					Total		Cash Paid		Non-cash gain		Notes Receivable		Previous equity interest			Net Liabilities/(Assets) Assumed			Land		Building		Intangible		Closing costs— expensed (1)
California (2)		1		3/30/2015	$	12,699	$	1,700	$	1,629	$	11,009	$	(1,264	)	$	(375	)	$	1,025	$	11,479	$	195	$	—
North Carolina, South Carolina		2		3/30/2015		13,165		13,143		—		—		—			22			1,763		11,229		144		29
Virginia		1		3/17/2015		5,073		5,065		—		—		—			8			118		4,797		81		77
Texas		1		2/24/2015		13,570		13,519		—		—		—			51			1,511		11,861		182		16
Texas		3		1/13/2015		41,904		41,806		—		—		—			98			12,080		29,489		300		35
2015 Totals		8			$	86,411	$	75,233	$	1,629	$	11,009	$	(1,264	)	$	(196	)	$	16,497	$	68,855	$	902	$	157

(1) This column represents costs paid at closing. The amounts shown exclude other acquisition costs paid before or after the closing date.

(2) This represents the acquisition of a joint venture partners’ interest in Extra Space of Sacramento One LLC (“Sacramento One”), an existing joint venture, for $1,700 in cash. The result of the acquisition is that the Company owns 100% of Sacramento One, which owned one store located in California. Prior to the acquisition date, the Company accounted for its interest in Sacramento One as an equity-method investment, and the Company also held mortgage notes receivable from Sacramento One totalling $11,009, including related interest. The total acquisition date fair value of the Company’s previous equity interest was approximately $365 and is included in consideration transfered. The Company recognized a non-cash gain of $1,629 as a result of remeasuring the fair value of its equity interest held prior to the acquisition. The store is consolidated subsequent to the acquisition as the Company owns 100% of the store.

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Variable Interests

3 Months Ended

Mar. 31, 2015

Equity Method Investments and Joint Ventures [Abstract]

Variable Interests

6. VARIABLE INTERESTS

The Operating Partnership has three wholly-owned unconsolidated subsidiaries (“Trust,” “Trust II” and “Trust III,” together, the “Trusts”) that have issued trust preferred securities to third parties and common securities to the Operating Partnership. The proceeds from the sale of the preferred and common securities were loaned in the form of notes to the Operating Partnership. The Trusts are VIEs because the holders of the equity investment at risk (the trust preferred securities) do not have the power to direct the activities of the entities that most significantly affect the entities’ economic performance because of their lack of voting or similar rights. Because the Operating Partnership’s investment in the Trusts’ common securities was financed directly by the Trusts as a result of its loan of the proceeds to the Operating Partnership, that investment is not considered an equity investment at risk. The Operating Partnership’s investment in the Trusts is not a variable interest because equity interests are variable interests only to the extent that the investment is considered to be at risk, and therefore the Operating Partnership cannot be the primary beneficiary of the Trusts. Since the Company is not the primary beneficiary of the Trusts, they have not been consolidated. A debt obligation has been recorded in the form of notes for the proceeds as discussed above, which are owed to the Trusts. The Company has also included its investment in the Trusts’ common securities in other assets on the condensed consolidated balance sheets.

The Company has not provided financing or other support during the periods presented to the Trusts that it was not previously contractually obligated to provide. The Company’s maximum exposure to loss as a result of its involvement with the Trusts is equal to the total amount of the notes discussed above less the amounts of the Company’s investments in the Trusts’ common securities. The net amount is the notes payable that the Trusts owe to third parties for their investments in the Trusts’ preferred securities.

Following is a tabular comparison of the liabilities the Company has recorded as a result of its involvement with the Trusts to the maximum exposure to loss the Company is subject to as a result of such involvement as of March 31, 2015:

	Notes payable to Trusts		Investment Balance		Maximum exposure to loss		Difference
Trust	$	36,083	$	1,083	$	35,000	$	—
Trust II		42,269		1,269		41,000		—
Trust III		41,238		1,238		40,000		—
	$	119,590	$	3,590	$	116,000	$	—

The Company had no consolidated VIEs during the three months ended March 31, 2015.

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Exchangeable Senior Notes

3 Months Ended

Mar. 31, 2015

Text Block [Abstract]

Exchangeable Senior Notes

8. EXCHANGEABLE SENIOR NOTES

On June 21, 2013, the Operating Partnership issued $250,000 of its 2.375% Exchangeable Senior Notes due 2033 at a 1.5% discount, or $3,750. Costs incurred to issue the Notes were approximately $1,672. These costs are being amortized as an adjustment to interest expense over five years, which represents the estimated term based on the first available redemption date, and are included in other assets in the condensed consolidated balance sheets. The Notes are general unsecured senior obligations of the Operating Partnership and are fully guaranteed by the Company. Interest is payable on January 1 and July 1 of each year beginning January 1, 2014, until the maturity date of July 1, 2033. The Notes bear interest at 2.375% per annum and contain an exchange settlement feature, which provides that the Notes may, under certain circumstances, be exchangeable for cash (for the principal amount of the Notes) and, with respect to any excess exchange value, for cash, shares of the Company’s common stock, or a combination of cash and shares of the Company’s common stock, at the Company’s option. The exchange rate of the Notes as of March 31, 2015 was approximately 17.98 shares of the Company’s common stock per $1,000 principal amount of the Notes.

The Operating Partnership may redeem the Notes at any time to preserve the Company’s status as a REIT. In addition, on or after July 5, 2018, the Operating Partnership may redeem the Notes for cash, in whole or in part, at 100% of the principal amount plus accrued and unpaid interest, upon at least 30 days but not more than 60 days prior written notice to the holders of the Notes. The holders of the Notes have the right to require the Operating Partnership to repurchase the Notes for cash, in whole or in part, on July 1 of the years 2018, 2023 and 2028, and upon the occurrence of certain designated events, in each case for a repurchase price equal to 100% of the principal amount of the Notes plus accrued and unpaid interest. Certain events are considered “Events of Default,” as defined in the indenture governing the Notes, which may result in the accelerated maturity of the Notes.

GAAP requires entities with convertible debt instruments that may be settled entirely or partially in cash upon conversion to separately account for the liability and equity components of the instrument in a manner that reflects the issuer’s economic interest cost. The Company therefore accounts for the liability and equity components of the Notes separately. The equity component is included in additional paid-in capital in stockholders’ equity in the condensed consolidated balance sheets, and the value of the equity component is treated as original issue discount for purposes of accounting for the debt component. The discount is being amortized as interest expense over the remaining period of the debt through its first redemption date, July 1, 2018. The effective interest rate on the liability component is 4.0%.

Information about the carrying amount of the equity component, the principal amount of the liability component, its unamortized discount and its net carrying amount was as follows for the periods indicated:

	March 31, 2015			December 31, 2014
Carrying amount of equity component	$	14,496		$	14,496
Principal amount of liability component	$	250,000		$	250,000
Unamortized discount—equity component		(9,751	)		(10,448	)
Unamortized cash discount		(2,418	)		(2,606	)
Net carrying amount of liability component	$	237,831		$	236,946

The amount of interest cost recognized relating to the contractual interest rate and the amortization of the discount on the liability component of the Notes were as follows for the periods indicated:

	For the Three Months Ended March 31,
	2015		2014
Contractual interest	$	1,484	$	1,484
Amortization of discount		697		662
Total interest expense recognized	$	2,181	$	2,146

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Earnings Per Common Share - Schedule of Antidilutive Shares Excluded from Computation of Earnings Per Share (Detail)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of Units	2,928,493	1,750,723
Equivalent Shares (if converted)	1,299,756	1,094,817
Series B Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of Units	1,676,087	1,342,727
Equivalent Shares (if converted)	638,850	724,232
Series C Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of Units	704,016	407,996
Equivalent Shares (if converted)	451,884	370,585
Series D Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of Units	548,390
Equivalent Shares (if converted)	209,022

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Noncontrolling Interest Represented by Preferred Operating Partnership Units - Series D Redeemable Preferred Units - Additional Information (Detail) (Series D Redeemable Preferred Units [Member], USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	0 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Series D Units [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Liquidation value (in dollars per share)	$ 25.00
Fixed liquidation value	$ 13,710
Annual rate of return (as a percent)	5.00%
Self Storage Facility in Florida [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Cash portion of payment for acquisition		5,621
Self Storage Facility in Florida [Member] | Series D Units [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Preferred Units Issued as Part of Acquisition (in shares)		548,390
Total consideration paid		$ 13,710

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Subsequent Events

3 Months Ended

Mar. 31, 2015

Subsequent Events [Abstract]

Subsequent Events

15. SUBSEQUENT EVENTS

On April 14, 2015, the Company purchased one store located in Texas for $8,650.

On April 15, 2015, the Company purchased a portfolio of 22 stores located in Arizona and Texas for $177,700.

On April 24, 2015, the Company purchased one store located in Georgia for $6,500.

On May 5, 2015 the Company purchased one store located in North Carolina for $11,000.

On May 7, 2015 the Company purchased another store located in Georgia for $6,500.

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Variable Interests (Tables)

3 Months Ended

Mar. 31, 2015

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Liabilities and Maximum Exposure to Loss Related to Trusts

Following is a tabular comparison of the liabilities the Company has recorded as a result of its involvement with the Trusts to the maximum exposure to loss the Company is subject to as a result of such involvement as of March 31, 2015:

	Notes payable to Trusts		Investment Balance		Maximum exposure to loss		Difference
Trust	$	36,083	$	1,083	$	35,000	$	—
Trust II		42,269		1,269		41,000		—
Trust III		41,238		1,238		40,000		—
	$	119,590	$	3,590	$	116,000	$	—

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Noncontrolling Interest Represented by Preferred Operating Partnership Units - Series B Redeemable Preferred Units - Additional Information (Detail) (Series B Redeemable Preferred Units [Member], USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	0 Months Ended
	Mar. 31, 2015	Apr. 03, 2014	Sep. 26, 2013 Store	Aug. 29, 2013 Store
Series B Units [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Liquidation value (in dollars per share)	$ 25.00
Fixed liquidation value	$ 41,902
Annual rate of return (as a percent)	6.00%
Georgia, 1 Property Acquired 4/3/2014 [Member] | Series B Units [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Preferred OP units issued as part of the acquisition (in shares)		333,360
Preferred OP units issued as part of the acquisition		8,334
Georgia, 1 Property Acquired 4/3/2014 [Member] | Operating Partnership [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Cash portion of payment for acquisition		15,158
Number of stores acquired		1
California, 20 Properties Acquired 2013-September [Member] | Operating Partnership [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Cash portion of payment for acquisition			100,876
Number of stores acquired			1	19
Number of stores acquired as part of portfolio acquisition				20
Debt assumed			98,960
Number of common units issued as part of acquisition			1,448,108
OP units issued as part of the acquisition			62,341
California, 20 Properties Acquired 2013-September [Member] | Operating Partnership [Member] | Series B Units [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Preferred OP units issued as part of the acquisition (in shares)			1,342,727
Preferred OP units issued as part of the acquisition			$ 33,568

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Derivatives - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015 Item
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Number of derivative financial instruments	23
Combined notional amount	$ 825,987
Estimated termination value on settlement	$ 7,740

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Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 58,636	$ 41,209
Other comprehensive loss:
Change in fair value of interest rate swaps	(6,593)	(2,747)
Total comprehensive income	52,043	38,462
Less: comprehensive income attributable to noncontrolling interests	4,617	3,750
Comprehensive income attributable to common stockholders	$ 47,426	$ 34,712

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Basis of Presentation

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Basis of Presentation

2. BASIS OF PRESENTATION

The accompanying unaudited condensed consolidated financial statements of the Company are presented on the accrual basis of accounting in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information, and in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they may not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (including normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three months ended March 31, 2015, are not necessarily indicative of results that may be expected for the year ending December 31, 2015. The condensed consolidated balance sheet as of December 31, 2014 has been derived from the Company’s audited financial statements as of that date, but does not include all of the information and footnotes required by GAAP for complete financial statements. For further information refer to the consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014, as filed with the Securities and Exchange Commission.

Reclassifications

Certain amounts in the Company’s 2014 consolidated financial statements and supporting note disclosures have been reclassified to conform to the current period presentation. Such reclassifications did not impact previously reported net income or accumulated deficit.

Recently Issued Accounting Standards

In April 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-08, “Presentation of Financial Statements (Topic 205) and Property, Plant and Equipment (Topic 360): Reporting Discontinued Operations and disclosures of Components of an Entity.” Under this guidance, only disposals representing a strategic shift in operations should be presented as discontinued operations. The guidance also requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. The Company adopted this guidance effective January 1, 2015. The Company has not previously had discontinued operations and as such, does not expect this guidance to have a significant impact on its consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which amends the guidance for revenue recognition to replace numerous, industry-specific requirements and converges areas under this topic with those of the International Financial Reporting Standards. ASU 2014-09 outlines a five-step process for customer contract revenue recognition that focuses on transfer of control, as opposed to transfer of risk and rewards. The amendment also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. ASU 2014-09 is effective for reporting periods beginning after December 15, 2016, and early adoption is prohibited. Entities can transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. Management is currently assessing the impact of the adoption of ASU 2014-09 on the Company’s condensed consolidated financial statements.

In June 2014, the FASB issued ASU 2014-12, “Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period,” which requires a reporting entity to treat a performance target that affects vesting, and that could be achieved after the requisite service period, as a performance condition. ASU 2014-12 is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2015. Early adoption is permitted. ASU 2014-12 may be adopted either prospectively for share-based payment awards granted or modified on or after the effective date, or retrospectively, using a modified retrospective approach. The modified retrospective approach would apply to share-based payment awards outstanding as of the beginning of the earliest annual period presented in the financial statements on adoption, and to all new or modified awards thereafter. The Company does not expect the adoption of ASU 2014-12 to have a material impact on its consolidated financial statements.

In February 2015, the FASB issued ASU 2015-02, “Consolidation (Topic 810): Amendments to the Consolidation Analysis.” This guidance is effective for annual reporting periods beginning after December 15, 2015, including interim periods within that reporting period. ASU 2015-02 amends the criteria for determining if a service provider possesses a variable interest in a VIE, and eliminates the presumption that a general partner should consolidate a limited partnership. The Company does not expect the adoption of this standard to materially impact its consolidated financial statements.

In April 2015, the FASB issued ASU 2015-03, “Interest—Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs.” This guidance requires debt issuance costs related to a recognized debt liability to be presented as a direct deduction from the carrying amount of that debt liability. The new guidance will only impact financial statement presentation. The guidance is effective in the first quarter of 2016 and allows for early adoption. The Company does not expect the adoption of this standard to materially impact its consolidated financial statements.

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Subsequent Events - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	0 Months Ended
	Mar. 31, 2015	Apr. 14, 2015 Store	Apr. 15, 2015 Store	May 07, 2015 Store	Apr. 24, 2015 Store	May 05, 2015 Store
Subsequent Event [Line Items]
Payment for acquisition	$ 86,411
Texas [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of self-storage facilities (stores) acquired		1
Payment for acquisition		8,650
Arizona and Texas [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of self-storage facilities (stores) acquired			22
Payment for acquisition			177,700
Georgia [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of self-storage facilities (stores) acquired				1	1
Payment for acquisition				6,500	6,500
North Carolina [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of self-storage facilities (stores) acquired						1
Payment for acquisition						$ 11,000

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Derivatives (Tables)

3 Months Ended

Mar. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Balance Sheet Classification and Fair Value of Entity's Derivative Financial Instruments

The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the condensed consolidated balance sheets:

	Asset (Liability) Derivatives
	March 31, 2015			December 31, 2014
Derivatives designated as hedging instruments:
Other assets	$	688		$	3,583
Other liabilities	$	(7,231	)	$	(3,533	)

Interest Payments Recognized as an Increase or Decrease in Interest Expense

The tables below present the effect of the Company’s derivative financial instruments on the condensed consolidated statements of operations for the periods presented. No tax effect has been presented as the derivative instruments are held by the Company:

	Classification of Income (Expense)	For the Three Months Ended March 31,
Type		2015			2014
Swap Agreements	Interest expense	$	(2,297	)	$	(2,293	)

Schedule of Information Relating to Gain (Loss) Recognized on Swap Agreements

	Gain (loss) recognized in OCI March 31,						Location of amounts reclassified from OCI into income	Gain (loss) reclassifed from OCI For the Three Months Ended March 31,
Type	2015			2014				2015			2014
Swap Agreements	$	(8,875	)	$	(5,043	)	Interest expense	$	(2,297	)	$	(2,293	)

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Store Acquisitions - Schedule of Operating Properties Acquired (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Store
Property Acquisitions [Line Items]
Number of operating stores owned by consolidated joint venture	19
Non-cash gain	$ 1,629
Company held mortgage notes receivable eliminated as a result of the acquisition	11,009
Extra Space of Sacramento One LLC [Member]
Property Acquisitions [Line Items]
Cash portion of payment for acquisition	1,700
Equity Ownership (as a percent)	100.00%
Number of operating stores owned by consolidated joint venture	1
Previous equity interest, fair value	365
Non-cash gain	1,629
Company held mortgage notes receivable eliminated as a result of the acquisition	$ 11,009

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

14. COMMITMENTS AND CONTINGENCIES

As of March 31, 2015, the Company is involved in various legal proceedings and is subject to various claims and complaints arising in the ordinary course of business. In the opinion of management, such litigation, claims and complaints are not expected to have a material adverse effect on the Company’s financial condition or results of operations.

As of March 31, 2015, the Company was under contract to acquire 42 stores for a total purchase price of $374,283. Of these 42 stores, 34 are scheduled to close in 2015. The remaining stores will close upon completion of construction, expected to occur on various dates in 2016 and 2017.