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, 2016

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, 2016, was 125,207,702.

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	27
ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	39
ITEM 4. CONTROLS AND PROCEDURES	39
PART II. OTHER INFORMATION	41
ITEM 1. LEGAL PROCEEDINGS	41
ITEM 1A. RISK FACTORS	41
ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	41
ITEM 3. DEFAULTS UPON SENIOR SECURITIES	41
ITEM 4. MINE SAFETY DISCLOSURES	41
ITEM 5. OTHER INFORMATION	41
ITEM 6. EXHIBITS	41
SIGNATURES	42

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;

• the failure to effectively manage our growth and expansion into new markets or to successfully operate acquired properties and operations;

• 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 U.S. 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.

3

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

Extra Space Storage Inc.

Condensed Consolidated Balance Sheets

(amounts in thousands, except share data)

	March 31, 2016			December 31, 2015
	(Unaudited)
Assets:
Real estate assets, net	$	5,933,959		$	5,689,309
Investments in unconsolidated real estate ventures		89,224			103,007
Cash and cash equivalents		49,753			75,799
Restricted cash		32,003			30,738
Receivables from related parties and affiliated real estate joint ventures		15,739			2,205
Other assets, net		170,741			170,349
Total assets	$	6,291,419		$	6,071,407
Liabilities, Noncontrolling Interests and Equity:
Notes payable, net	$	2,842,076		$	2,758,567
Exchangeable senior notes, net		606,887			623,863
Notes payable to trusts, net		117,225			117,191
Lines of credit		116,000			36,000
Accounts payable and accrued expenses		77,108			82,693
Other liabilities		106,738			80,489
Total liabilities		3,866,034			3,698,803
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, 125,129,324 and 124,119,531 shares issued and outstanding at March 31, 2016 and December 31, 2015, respectively		1,251			1,241
Additional paid-in capital		2,506,551			2,431,754
Accumulated other comprehensive loss		(35,939	)		(6,352	)
Accumulated deficit		(328,801	)		(337,566	)
Total Extra Space Storage Inc. stockholders’ equity		2,143,062			2,089,077
Noncontrolling interest represented by Preferred Operating Partnership units, net of $120,230 notes receivable		80,371			80,531
Noncontrolling interests in Operating Partnership		201,791			202,834
Other noncontrolling interests		161			162
Total noncontrolling interests and equity		2,425,385			2,372,604
Total liabilities, noncontrolling interests and equity	$	6,291,419		$	6,071,407

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,
	2016			2015
Revenues:
Property rental	$	199,488		$	148,894
Tenant reinsurance		20,555			16,510
Management fees and other income		9,360			7,750
Total revenues		229,403			173,154
Expenses:
Property operations		61,112			47,244
Tenant reinsurance		4,311			2,928
Acquisition related costs		4,053			869
General and administrative		23,402			16,249
Depreciation and amortization		42,897			30,428
Total expenses		135,775			97,718
Income from operations		93,628			75,436
Loss on earnout from prior acquisition		(1,544	)		—
Interest expense		(31,359	)		(21,431	)
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes		(1,233	)		(697	)
Interest income		1,714			856
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		62,419			55,377
Equity in earnings of unconsolidated real estate ventures		2,830			2,650
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners’ interests		26,923			2,857
Income tax expense		(2,765	)		(2,248	)
Net income		89,407			58,636
Net income allocated to Preferred Operating Partnership noncontrolling interests		(3,180	)		(2,926	)
Net income allocated to Operating Partnership and other noncontrolling interests		(3,635	)		(1,968	)
Net income attributable to common stockholders	$	82,592		$	53,742
Earnings per common share
Basic	$	0.66		$	0.46
Diluted	$	0.66		$	0.46
Weighted average number of shares
Basic		124,754,174			116,117,615
Diluted		131,956,094			122,595,718
Cash dividends paid per common share	$	0.59		$	0.47

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,
	2016			2015
Net income	$	89,407		$	58,636
Other comprehensive income (loss):
Change in fair value of interest rate swaps		(31,148	)		(6,593	)
Total comprehensive income		58,259			52,043
Less: comprehensive income attributable to noncontrolling interests		5,254			4,617
Comprehensive income attributable to common stockholders	$	53,005		$	47,426

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 Capital			Accumulated Other Comprehensive Loss			Accumulated Deficit			Total Noncontrolling Interests and Equity
Balances at December 31, 2015	$	14,189		$	41,902		$	10,730		$	13,710		$	202,834		$	162			124,119,531		$	1,241	$	2,431,754		$	(6,352	)	$	(337,566	)	$	2,372,604
Issuance of common stock upon the exercise of options		—			—			—			—			—			—			850			—		13			—			—			13
Restricted stock grants issued		—			—			—			—			—			—			47,768			—		—			—			—			—
Restricted stock grants cancelled		—			—			—			—			—			—			(1,354	)		—		—			—			—			—
Issuance of common stock, net of offering costs		—			—			—			—			—			—			831,300			8		73,566			—			—			73,574
Compensation expense related to stock-based awards		—			—			—			—			—			—			—			—		1,710			—			—			1,710
Redemption of Operating Partnership units for common stock		—			—			—			—			(12	)		—			320			—		12			—			—			—
Repurchase of equity portion of 2013 exchangeable senior notes		—			—			—			—			—			—			130,909			2		(776	)		—			—			(774	)
Net income		1,838			629			542			171			3,636			(1	)		—			—		—			—			82,592			89,407
Other comprehensive income loss		(210	)		—			—			—			(1,351	)		—			—			—		—			(29,587	)		—			(31,148	)
Tax effect from vesting of restricted stock grants and stock option exercises		—			—			—			—			—			—			—			—		272			—			—			272
Distributions to Operating Partnership units held by noncontrolling interests		(1,788	)		(629	)		(542	)		(171	)		(3,316	)		—			—			—		—			—			—			(6,446	)
Dividends paid on common stock at $0.59 per share		—			—			—			—			—			—			—			—		—			—			(73,827	)		(73,827	)
Balances at March 31, 2016	$	14,029		$	41,902		$	10,730		$	13,710		$	201,791		$	161			125,129,324		$	1,251	$	2,506,551		$	(35,939	)	$	(328,801	)	$	2,425,385

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,
	2016			2015
Cash flows from operating activities:
Net income	$	89,407		$	58,636
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		42,897			30,428
Amortization of deferred financing costs		2,823			1,598
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes		1,233			697
Non-cash interest expense related to amortization of premium on notes payable		(354	)		(747	)
Compensation expense related to stock-based awards		1,710			1,142
Gain on sale of real estate assets and purchase of joint venture partners’ interests		(26,923	)		(2,857	)
Loss on real estate transactions and earnout from prior acquisition		(1,544	)		—
Distributions from unconsolidated real estate ventures in excess of earnings		998			2,601
Changes in operating assets and liabilities:
Receivables from related parties and affiliated real estate joint ventures		(2,878	)		(2,367	)
Other assets		(5,276	)		(2,637	)
Accounts payable and accrued expenses		(5,642	)		6,032
Other liabilities		(985	)		(5,087	)
Net cash provided by operating activities		95,466			87,439
Cash flows from investing activities:
Acquisition of real estate assets		(234,820	)		(77,082	)
Development and redevelopment of real estate assets		(6,543	)		(3,140	)
Change in restricted cash		(1,265	)		(10,105	)
Investment in unconsolidated real estate ventures		(4,794	)		—
Return of investment in unconsolidated real estate ventures		318			—
Purchase/issuance of notes receivable		(10,656	)		—
Purchase of equipment and fixtures		(908	)		(1,184	)
Net cash used in investing activities		(258,668	)		(91,511	)
Cash flows from financing activities:
Proceeds from the sale of common stock, net of offering costs		73,574			—
Repurchase of exchangeable senior notes		(19,639	)		—
Proceeds from notes payable and lines of credit		195,976			290,768
Principal payments on notes payable and lines of credit		(32,859	)		(228,878	)
Deferred financing costs		(1,286	)		(1,419	)
Net proceeds from exercise of stock options		13			970
Proceeds from termination of interest rate cap		1,650			—
Dividends paid on common stock		(73,827	)		(54,732	)
Distributions to noncontrolling interests		(6,446	)		(4,996	)
Net cash provided by financing activities		137,156			1,713
Net decrease in cash and cash equivalents		(26,046	)		(2,359	)
Cash and cash equivalents, beginning of the period		75,799			47,663
Cash and cash equivalents, end of the period	$	49,753		$	45,304

See accompanying notes to unaudited condensed consolidated financial statements.

8

	For the Three Months Ended March 31,
	2016			2015
Supplemental schedule of cash flow information
Interest paid	$	24,873		$	21,754
Income taxes paid		4,835			661
Supplemental schedule of noncash investing and financing activities:
Redemption of Operating Partnership units held by noncontrolling interests for common stock:
Noncontrolling interests in Operating Partnership	$	(12	)	$	—
Common stock and paid-in capital		12			—
Tax effect from vesting of restricted stock grants and option exercises
Other assets	$	272		$	644
Paid-in capital		(272	)		(644	)
Acquisitions of real estate assets
Real estate assets, net	$	—		$	11,009
Receivables from related parties and affiliated real estate joint ventures		—			(11,009	)
Distribution of real estate from investments in unconsolidated real estate ventures
Real estate assets, net	$	17,261		$	—
Investments in unconsolidated real estate ventures		(17,261	)		—

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, or 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, 2016, the Company had direct and indirect equity interests in 1,018 stores. In addition, the Company managed 353 stores for third parties, bringing the total number of stores which it owns and/or manages to 1,371. These stores are located in 37 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, 2016, are not necessarily indicative of results that may be expected for the year ending December 31, 2016. The condensed consolidated balance sheet as of December 31, 2015 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, 2015, as filed with the Securities and Exchange Commission.

Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“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 was originally effective for reporting periods beginning after December 15, 2016. Entities can transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. In July 2015, the FASB approved a one-year deferral of the effective date of the standard. The new standard will now become effective for annual and interim periods beginning after December 15, 2017 with early adoption on the original effective date permitted. The Company has not yet selected a transition method. The Company is currently assessing the impact of the adoption of ASU 2014-09 on the Company’s 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 variable interest entity (“VIE”), and eliminates the presumption that a general partner should consolidate a limited partnership. The Company adopted this guidance effective January 1, 2016. The adoption of this guidance did not have a significant impact on the Company’s condensed consolidated financial statements.

10

In April 2015, the FASB issued ASU 2015-05, “Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40) – Customers Accounting for Fees Paid in a Cloud Computing Arrangement,” which provides guidance regarding the accounting for fees paid by a customer in cloud computing arrangements. If a cloud computing arrangement includes a software license, the payment of fees should be accounted for in the same manner as the acquisition of other software licenses. If there is no software license, the fees should be accounted for as a service contract. The guidance is effective in fiscal years beginning after December 15, 2015 and early adoption is permitted. An entity can elect to adopt the amendments either (1) prospectively to all arrangements entered into or materially modified after the effective date or (2) retrospectively. The Company adopted this guidance prospectively effective January 1, 2016. The adoption of this guidance did not have a significant impact on the Company’s condensed consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which requires lessees to recognize the following for all leases (with the exception of short-term leases) at the commencement date: (1) a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and (2) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Lessor accounting is largely unchanged under ASU 2016-02. The guidance is effective for annual and interim periods beginning after December 15, 2018. The Company is currently assessing the impact of the adoption of ASU 2016-02 on the Company’s consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, “Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” ASU 2016-09 simplifies several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. This ASU is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the new guidance to determine the impact it may have on 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 FASB’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, 2016, 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.

11

The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis as of March 31, 2016, aggregated by the level in the fair value hierarchy within which those measurements fall.

	Fair Value Measurements at Reporting Date Using
Description	March 31, 2016			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	$	463		$	—	$	463		$	—
Other liabilities - Cash Flow Hedge Swap Agreements	$	(34,708	)	$	—	$	(34,708	)	$	—

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, 2016 or December 31, 2015.

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, the Company would recognize a loss on the assets held for sale. The operations of assets held for sale or sold during the period are presented as part of normal operations for all periods presented. As of March 31, 2016, the Company had eight stores classified as held for sale. The estimated fair value less selling costs of each of these assets is greater than the carrying value of the assets, and therefore no loss has been recorded.

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, 2016 and December 31, 2015 approximate fair value.

The fair values of the Company’s notes receivable from Preferred Operating Partnership unit holders and other fixed rate notes receivable 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.

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

	March 31, 2016				December 31, 2015
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	130,856	$	120,230	$	128,216	$	120,230
Fixed rate notes receivable	$	85,927	$	84,331	$	86,814	$	84,331
Fixed rate notes payable and notes payable to trusts	$	2,329,420	$	2,271,925	$	1,828,486	$	1,806,904
Exchangeable senior notes	$	767,992	$	640,725	$	770,523	$	660,364

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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, 2016 and 2015, options to purchase approximately 67,812 and 19,762 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 $86.91.

	For the Three Months Ended March 31,
	2016				2015
	Number of Units		Equivalent Shares (if converted)		Number of Units		Equivalent Shares (if converted)
Series B Units		1,676,087		482,133		1,676,087		638,850
Series C Units		704,016		341,032		704,016		451,884
Series D Units		548,390		157,747		548,390		209,022
		2,928,493		980,912		2,928,493		1,299,756

The Operating Partnership had $65,725 of its 2.375% Exchangeable Senior Notes due 2033 (the “2013 Notes”) issued and outstanding as of March 31, 2016. The 2013 Notes could potentially have a dilutive impact on the Company’s earnings per share calculations. The 2013 Notes are exchangeable by holders into shares of the Company’s common stock under certain circumstances per the terms of the indenture governing the 2013 Notes. The exchange price of the 2013 Notes was $54.87 per share as of March 31, 2016, 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 2013 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.

The Operating Partnership had $575,000 of its 3.125% Exchangeable Senior Notes due 2035 (the “2015 Notes”) issued and outstanding as of March 31, 2016. The 2015 Notes could potentially have a dilutive impact on the Company’s earnings per share calculations. The 2015 Notes are exchangeable by holders into shares of the Company’s common stock under certain circumstances per the terms of the indenture governing the 2015 Notes. The exchange price of the 2015 Notes was $95.40 per share as of March 31, 2016, 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 2015 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.

Although the Company has retained the right to satisfy the exchange obligation in excess of the accreted principal amount of the 2013 Notes and 2015 Notes in cash and/or common stock, Accounting Standards Codification (“ASC”) 260, “Earnings per Share,” requires an assumption that shares would be used to pay such exchange obligation, 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, 2016 and 2015, 441,598 and 682,502 shares, respectively, related to the 2013 Notes were included in the computation for diluted earnings per share. For the three months ended March 31, 2016, no shares related to the 2015 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 three months ended March 31, 2015, no shares related to the 2015 Notes were included in the computation for diluted earnings per share as the 2015 Notes were not outstanding during that time period.

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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, 2016 of $41,902 by the closing price of the Company’s common stock as of March 31, 2016 of $93.46 per share. Assuming full exchange for common shares as of March 31, 2016, 448,342 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, 2016 of $29,639 by the closing price of the Company’s common stock as of March 31, 2016 of $93.46 per share. Assuming full exchange for common shares as of March 31, 2016, 317,130 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, 2016 of $13,710 by the closing price of the Company’s common stock as of March 31, 2016 of $93.46 per share. Assuming full exchange for common shares as of March 31, 2016, 146,694 shares would have been issued to the holders of the Series D Units.

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

	For the Three Months Ended March 31,
	2016			2015
Net income attributable to common stockholders	$	82,592		$	53,742
Earnings and dividends allocated to participating securities		(165	)		(119	)
Earnings for basic computations		82,427			53,623
Earnings and dividends allocated to participating securities		—			119
Income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units) and Operating Partnership		5,474			3,635
Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units)		(1,271	)		(1,274	)
Net income for diluted computations	$	86,630		$	56,103
Weighted average common shares outstanding:
Average number of common shares outstanding - basic		124,754,174			116,117,615
Series A Units		875,480			875,480
OP Units		5,621,470			4,365,879
Unvested restricted stock awards included for treasury stock method		—			282,903
Shares related to exchangeable senior notes and dilutive stock options		704,970			953,841
Average number of common shares outstanding - diluted		131,956,094			122,595,718
Earnings per common share
Basic	$	0.66		$	0.46
Diluted	$	0.66		$	0.46

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5. STORE ACQUISITIONS

The following table shows the Company’s acquisitions of operating stores for the three months ended March 31, 2016, and does not include purchases of raw land or improvements made to existing assets:

			Consideration Paid							Fair Value
Property Location	Number of Stores	Date of Acquisition	Total		Cash Paid		Net Liabilities/ (Assets) Assumed			Real estate assets
New Mexico	1	3/29/2016	$	10,958	$	10,928	$	30		$	10,958
New Mexico	1	3/29/2016		17,940		17,905		35			17,940
Georgia	3	3/29/2016		25,087		25,069		18			25,087
Texas	1	3/21/2016		9,994		9,969		25			9,994
Illinois	1	2/25/2016		16,721		16,738		(17	)		16,721
Massachusetts	1	2/16/2016		16,169		16,174		(5	)		16,169
Florida, Maryland, Nevada, New York, Tennessee (1)	6	2/2/2016		53,898		53,940		(42	)		98,082
Texas	3	1/14/2016		22,625		22,523		102			22,625
Florida	1	1/12/2016		9,001		8,980		21			9,001
Texas	3	1/7/2016		27,537		27,435		102			27,537
New Mexico	2	1/7/2016		15,607		15,495		112			15,607
2016 Totals	23		$	225,537	$	225,156	$	381		$	269,721

(1) - On February 2, 2016, the Company acquired six stores from its VRS Self Storage LLC joint venture (“VRS”) in a step acquisition. The Company owns 45.04% of VRS, with the other 54.96% owned by affiliates of Prudential Real Estate (“Prudential”). VRS created a new subsidiary, Extra Space Properties 122 LLC (“ESP 122”) and transferred six stores into ESP 122. VRS then distributed ESP 122 to the Company and Prudential on a pro rata basis. This distribution was accounted for as a spinoff, and was therefore recorded at the net carrying amount of the properties of $17,261. Immediately after the distribution, the Company acquired Prudential’s 54.96% interest in ESP 122 for $53,940, resulting in 100% ownership of ESP 122 and the related six stores. Based on the purchase price of Prudential’s share of ESP 122, the Company determined that the fair value of its investment in ESP 122 immediately prior to the acquisition of Prudential’s share was $44,184, and the Company recorded a gain of $26,923 as a result of re-measuring to fair value its existing equity interest in ESP 122. This gain is included in equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners’ interests on the Company’s condensed consolidated statements of operations.

Losses on Earnout from Prior Acquisition

In December 2014, the Company acquired a portfolio of five stores located in New Jersey and Virginia. As part of this acquisition, the Company agreed to make an additional cash payment to the sellers if the acquired stores exceeded a specified amount of net operating income for the years ending December 31, 2015 and 2016. At the acquisition date, the Company recorded an estimated liability related to this earnout provision. The operating income of these stores during the earnout period has been higher than expected, resulting in an increase in the estimate of the amount due to the sellers of $1,544, which was recorded as a loss and included in loss earnout from prior acquisitions in the Company’s condensed consolidated statements of operations for three months ended March 31, 2016.

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6. INVESTMENTS IN UNCONSOLIDATED REAL ESTATE VENTURES

On March 31, 2016, the Company entered into a new joint venture, ESS-H Baychester Investments LLC (“Baychester”). Baychester owns a single store in New York. The Company contributed $4,794 for a 44.4% interest in Baychester. The Company accounts for its investment in Baychester under the equity method of accounting.

7. 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 equal to 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 assets and 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, 2016:

	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		—
Unamortized debt issuance costs		(2,365	)
	$	117,225		$	3,590	$	116,000	$	—

The Company had no consolidated VIEs during the three months ended March 31, 2016.

8. 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.

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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, 2016 and 2015, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. During the remainder of 2016, the Company estimates that an additional $16,403 will be reclassified as an increase to interest expense.

The Company held 29 derivative financial instruments which had a total combined notional amount of $1,850,111 as of March 31, 2016.

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, 2016			December 31, 2015
Derivatives designated as hedging instruments:	Fair Value
Other assets	$	463		$	4,996
Other liabilities	$	(34,708	)	$	(6,991	)

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		2016			2015
Swap Agreements	Interest expense	$	(4,454	)	$	(2,297	)

	Gain (loss) recognized in OCI For the Three Months Ended March 31,						Location of amounts reclassified from OCI into income	Gain (loss) reclassifed from OCI For the Three Months Ended March 31,
Type	2016			2015				2016			2015
Swap Agreements	$	(34,960	)	$	(8,875	)	Interest expense	$	(4,454	)	$	(2,297	)

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, 2016, the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $34,708. As of March 31, 2016, the Company had not posted any collateral related to these agreements. If the Company had breached any of these provisions as of March 31, 2016, it could have been required to settle its obligations under the agreements at their termination value of $37,240 including accrued interest.

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9. EXCHANGEABLE SENIOR NOTES

In September 2015, the Operating Partnership issued $575,000 of its 3.125% Exchangeable Senior Notes due 2035. Costs incurred to issue the 2015 Notes were approximately $11,992, consisting primarily of a 2% underwriting fee. 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 exchangeable senior notes, net, in the condensed consolidated balance sheets. The 2015 Notes are general unsecured senior obligations of the Operating Partnership and are fully guaranteed by the Company. Interest is payable on April 1 and October 1 of each year beginning April 1, 2016, until the maturity date of October 1, 2035. The Notes bear interest at 3.125% per annum and contain an exchange settlement feature, which provides that the 2015 Notes may, under certain circumstances, be exchangeable for cash (for the principal amount of the 2015 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 2015 Notes as of March 31, 2016 was approximately 10.48 shares of the Company’s common stock per $1,000 principal amount of the 2015 Notes.

The Operating Partnership may redeem the 2015 Notes at any time to preserve the Company’s status as a REIT. In addition, on or after October 5, 2020, the Operating Partnership may redeem the 2015 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 2015 Notes. The holders of the 2015 Notes have the right to require the Operating Partnership to repurchase the 2015 Notes for cash, in whole or in part, on October 1 of the years 2020, 2025 and 2030 (unless the Operating Partnership has called the 2015 Notes for redemption), and upon the occurrence of certain designated events, in each case for a repurchase price equal to 100% of the principal amount of the 2015 Notes plus accrued and unpaid interest. Certain events are considered “Events of Default,” as defined in the indenture governing the 2015 Notes, which may result in the accelerated maturity of the 2015 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 2013 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 exchangeable senior notes, net, in the condensed consolidated balance sheets. The 2013 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 2013 Notes bear interest at 2.375% per annum and contain an exchange settlement feature, which provides that the 2013 Notes may, under certain circumstances, be exchangeable for cash (for the principal amount of the 2013 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 2013 Notes as of March 31, 2016 was approximately 18.22 shares of the Company’s common stock per $1,000 principal amount of the 2013 Notes.

The Operating Partnership may redeem the 2013 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 2013 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 2013 Notes. The holders of the 2013 Notes have the right to require the Operating Partnership to repurchase the 2013 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 2013 Notes plus accrued and unpaid interest. Certain events are considered “Events of Default,” as defined in the indenture governing the 2013 Notes, which may result in the accelerated maturity of the 2013 Notes.

Additionally, the 2013 Notes can be exchanged during any calendar quarter, if the last reported sale price of the common stock of the Company is greater than or equal to 130% of the exchange price for at least 20 trading days during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter. The price of the Company’s common stock exceeded 130% of the exchange price for the required time period for the 2013 Notes during the quarter ended March 31, 2016. Therefore, holders of the 2013 Notes may elect to exchange such notes during the quarter ended June 30, 2016.

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 2013 Notes and 2015 Notes separately. The equity components are included in paid-in capital in stockholders’ equity in the condensed consolidated balance sheets, and the value of the equity components are treated as original issue discount for purposes of accounting for the debt components. The discounts are being amortized as interest expense over the remaining period of the debt through its first redemption date: July 1, 2018 for the 2013 Notes, and October 1, 2020 for the 2015 Notes. The effective interest rate on the liability components of both the 2013 Notes and the 2015 Notes is 4.0%, which approximates the market rate of interest of similar debt without exchange features (i.e. nonconvertible debt) at the time of issuance.

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Information about the Company’s 2013 Notes and 2015 Notes, including the total carrying amounts of the equity components, the principal amounts of the liability components, the unamortized discounts and the net carrying amounts was as follows for the periods indicated:

	March 31, 2016			December 31, 2015
Carrying amount of equity component - 2013 Notes	$	—		$	—
Carrying amount of equity component - 2015 Notes		22,597			22,597
Carrying amount of equity components	$	22,597		$	22,597
Principal amount of liability component 2013 Notes	$	65,725		$	85,364
Principal amount of liability component 2015 Notes		575,000			575,000
Unamortized discount - equity component - 2013 Notes		(1,827	)		(2,605	)
Unamortized discount - equity component - 2015 Notes		(20,533	)		(21,565	)
Unamortized cash discount - 2013 Notes		(438	)		(633	)
Unamortized debt issuance costs		(11,040	)		(11,698	)
Net carrying amount of liability components	$	606,887		$	623,863

The amount of interest cost recognized relating to the contractual interest rates and the amortization of the discounts on the liability components of the Notes were as follows for the periods indicated:

	For the Three Months Ended March 31,
	2016		2015
Contractual interest	$	4,882	$	1,484
Amortization of discount		1,233		697
Total interest expense recognized	$	6,115	$	2,181

Repurchases of 2013 Notes

During February 2016, the Company repurchased a total principal amount of $19,639 of the 2013 Notes. The Company paid cash for the principal amount, and issued a total of 130,909 shares of common stock valued at $11,380 for the exchange value in excess of the principal amount. The Company allocated the value of the consideration paid to repurchase the 2013 Notes (1) to the extinguishment of the liability component and (2) to the reacquisition of the equity component. The amount allocated to the extinguishment of the liability component is equal to the fair value of that component immediately prior to extinguishment. The difference between the consideration attributed to the extinguishment of the liability component and the sum of (a) the net carrying amount of the repurchased liability component, and (b) the related unamortized debt issuance costs, is recognized as a gain on debt extinguishment. The remaining settlement consideration is allocated to the reacquisition of the equity component of the repurchased 2013 Notes and recognized as a reduction of stockholders’ equity.

Information about the repurchase is as follows:

	February 2016
Principal amount repurchased	$	19,639
Amount allocated to:
Extinguishment of liability component	$	18,887
Reacquisition of equity component		12,132
Total consideration paid for repurchase	$	31,019
Exchangeable senior notes repurchased	$	19,639
Extinguishment of liability component		(18,887	)
Discount on exchangeable senior notes		(716	)
Related debt issuance costs		(36	)
Gain/(loss) on repurchase	$	—

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10. STOCKHOLDERS’ EQUITY

On August 28, 2015, the Company filed a $400,000 “at the market” equity program with the Securities and Exchange Commission, and entered into separate equity distribution agreements with five sales agents. During the three months ended March 31, 2016, the Company sold 831,300 shares of common stock at an average sales price of $89.66 per share, resulting in net proceeds of $73,574.

11. 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.

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 June 25, 2007, the Operating Partnership loaned the holders of the Series A Units $100,000. The note receivable bears interest at 4.85%. 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. 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. 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 Series D Units, and senior to all other partnership interests of the Operating Partnership with respect to distributions and liquidation.

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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 6.0%. These distributions are cumulative. The Series B Units became 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 Series D 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 became 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 also became 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 became 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.

12. 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 93.0% ownership interest in the Operating Partnership as of March 31, 2016. The remaining ownership interests in the Operating Partnership (including Preferred Operating Partnership units) of 7.0% 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

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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, 2016 was $90.76 and there were 5,621,322 OP Units outstanding. Assuming that all of the OP Unit holders exercised their right to redeem all of their OP Units on March 31, 2016 and the Company elected to pay the OP Unit holders cash, the Company would have paid $510,191 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.

13. OTHER NONCONTROLLING INTERESTS

Other noncontrolling interests represent the ownership interest of third parties in two consolidated joint ventures as of March 31, 2016. One of these consolidated joint ventures owns a single operating store in California, and the other owns a store under development in Texas. The voting interests of the third-party owners range from 17.5% to 20.0%. Other noncontrolling interests are included in the stockholders’ equity section of the Company’s condensed consolidated balance sheets. The income or losses attributable to this third-party owner based on its ownership percentage are reflected in net income allocated to Operating Partnership and other noncontrolling interests in the condensed consolidated statements of operations.

On June 11, 2015, the Company purchased its joint venture partner’s remaining 1% interest in an existing joint venture for $1,267. The joint venture owned 19 properties in California, Florida, Nevada, Ohio, Pennsylvania, Tennessee, Texas and Virginia, and as a result of this purchase, these properties became wholly-owned by the Company. Prior to this acquisition, the partner’s interest was reported in other noncontrolling interests. Since the Company retained its controlling interest in the subsidiary, this transaction was accounted for as an equity transaction. The carrying amount of the noncontrolling interest was reduced to zero to reflect the purchase, and the difference between the price paid by the Company and the carrying value of the noncontrolling interest was recorded as an adjustment to equity attributable to the Company.

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

On February 2, 2016, the Company acquired six operating stores from VRS in a step acquisition. The Company recognized a non-cash gain of $26,923 related to this transaction as a result of revaluing its existing equity interest upon the purchase of the remaining interest. See the Store Acquisitions footnote for more information.

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 written off as part of the total consideration. 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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15. 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, 2016		December 31, 2015
Balance Sheet
Investment in unconsolidated real estate ventures
Rental operations	$	89,224	$	103,007
Total assets
Rental operations	$	5,901,210	$	5,674,030
Tenant reinsurance		34,180		37,696
Property management, acquisition and development		356,029		359,681
	$	6,291,419	$	6,071,407

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	For the Three Months Ended March 31,
	2016			2015
Statement of Operations
Total revenues
Rental operations	$	199,488		$	148,894
Tenant reinsurance		20,555			16,510
Property management, acquisition and development		9,360			7,750
		229,403			173,154
Operating expenses, including depreciation and amortization
Rental operations		101,698			75,509
Tenant reinsurance		4,311			2,928
Property management, acquisition and development		29,766			19,281
		135,775			97,718
Income (loss) from operations
Rental operations		97,790			73,385
Tenant reinsurance		16,244			13,582
Property management, acquisition and development		(20,406	)		(11,531	)
		93,628			75,436
Loss on earnout from prior acquisition
Property management, acquisition and development		(1,544	)		—
Interest expense
Rental operations		(30,565	)		(21,157	)
Property management, acquisition and development		(794	)		(274	)
		(31,359	)		(21,431	)
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes
Property management, acquisition and development		(1,233	)		(697	)
Interest income
Tenant reinsurance		3			4
Property management, acquisition and development		1,711			852
		1,714			856
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		2,830			2,650
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of partners’ interests
Property management, acquisition and development		26,923			2,857
Income tax (expense) benefit
Rental operations		(845	)		(754	)
Tenant reinsurance		(2,663	)		(1,874	)
Property management, acquisition and development		743			380
		(2,765	)		(2,248	)
Net income (loss)
Rental operations		69,210			54,124
Tenant reinsurance		13,584			11,712
Property management, acquisition and development		6,613			(7,200	)
	$	89,407		$	58,636

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	For the Three Months Ended March 31,
	2016			2015
Depreciation and amortization expense
Rental operations	$	40,586		$	28,265
Property management, acquisition and development		2,311			2,163
	$	42,897		$	30,428
Statement of Cash Flows
Acquisition of real estate assets
Property management, acquisition and development	$	(234,820	)	$	(77,082	)
Development and redevelopment of real estate assets
Property management, acquisition and development	$	(6,543	)	$	(3,140	)

16. COMMITMENTS AND CONTINGENCIES

As of March 31, 2016, the Company is involved in various legal proceedings and is subject to various claims and complaints arising in the ordinary course of business. Because litigation is inherently unpredictable, the outcome of these matters cannot presently be determined with any degree of certainty. In accordance with applicable accounting guidance, management establishes an accrued liability for litigation when those matters present loss contingencies that are both probable and reasonably estimable. In such cases, there may be an exposure to loss in excess of any amounts accrued. The estimated loss, if any, is based upon currently available information and is subject to significant judgment, a variety of assumptions, and known and unknown uncertainties. Therefore, any estimate(s) of loss disclosed below represents what management believes to be an estimate of loss only for certain matters meeting these criteria and does not represent the Company’s maximum loss exposure. The Company could in the future incur judgments or enter into settlements of claims that could have a material adverse effect on its results of operations in any particular period, notwithstanding the fact that the Company is currently vigorously defending any legal proceedings against it.

The Company currently has a legal proceeding pending against it that includes causes of action alleging wrongful foreclosure, violations of various state specific self-storage statutes, and violations of various consumer fraud acts. As a result of this litigation matter, the Company recorded a liability of $4,000 during the three months ended March 31, 2016, which is included in other liabilities on the condensed consolidated balance sheet.

As of March 31, 2016, the Company was under contract to acquire 21 operating stores and nine stores to be acquired upon the completion of construction, for a total purchase price of $349,376. Of these stores, 26 are scheduled to close in 2016. The remaining stores will close upon completion of construction, expected to occur on various dates in 2017 and 2018. Additionally, the Company is under contract to acquire 10 stores with joint venture partners, for a total purchase price of $302,800. Seven of those stores are scheduled to close in 2016 while the remaining three stores are expected to close in 2017 and 2018.

Although there can be no assurance, the Company is not aware of any material environmental liability, for which it believes it will be ultimately responsible, that could have a material adverse effect on its financial condition or results of operations. However, changes in applicable environmental laws and regulations, the uses and conditions of properties in the vicinity of the Company’s properties, the activities of its tenants and other environmental conditions of which the Company is unaware with respect to its properties could result in future material environmental liabilities.

17. SUBSEQUENT EVENTS

Subsequent to March 31, 2016, the Company has purchased 10 stores for a total purchase price of $88,048. These stores are located in Arizona, Colorado, Hawaii, Indiana and Texas.

On April 20, 2016, the Company sold seven stores located in Ohio and Indiana that had been classified as held for sale for $18,000.

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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, 2015. 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, 2015 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.

• 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, 2016, we owned, had ownership interests in, or managed 1,371 stores in 37 states, Washington, D.C. and Puerto Rico. Of these 1,371 stores, we owned 769 stores, we held joint venture interests in 249 stores, and our taxable REIT subsidiary, Extra Space Management, Inc., operated an additional 353 stores that are owned by third parties. These operating stores contain approximately 103 million square feet of rentable space in approximately 910,000 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 markets contain above-average population growth and income demographics. 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, 2016, approximately 815,000 tenants were leasing storage units at the 1,371 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, 2016, the average length of stay was approximately 13.8 months for tenants that vacated during the preceeding twelve month period.

The average annual rent per square foot for our existing customers at stabilized stores, net of discounts and bad debt, was $14.98 for the three months ended March 31, 2016, compared to $13.99 for the three months ended March 31, 2015. Average annual rent per square foot for new leases was $15.72 for the three months ended March 31, 2016, compared to $14.51 for the three months ended March 31, 2015. 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, 2016 and 2015. The information as of March 31, 2015 is on a pro forma basis as though all the stores owned and/or managed at March 31, 2016 were under our control as of March 31, 2015.

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Stabilized Store Data Based on Location

			Company		Pro forma		Company		Pro forma		Company			Pro forma
Location	Number of Stores		Number of Units as of March 31, 2016 (1)		Number of Units as of March 31, 2015		Net Rentable Square Feet as of March 31, 2016 (2)		Net Rentable Square Feet as of March 31, 2015		Square Foot Occupancy % March 31, 2016			Square Foot Occupancy % March 31, 2015
Wholly-Owned Stores
Alabama		8		4,590		4,521		559,426		559,771		90.5	%		86.6	%
Arizona		18		10,478		10,445		1,214,237		1,216,269		92.7	%		91.2	%
California		135		102,827		102,222		10,721,250		10,719,024		94.8	%		93.8	%
Colorado		12		5,942		5,934		737,269		739,109		91.7	%		94.2	%
Connecticut		5		3,141		3,133		298,846		299,429		92.6	%		93.9	%
Florida		76		53,761		53,373		5,756,042		5,741,030		93.1	%		91.6	%
Georgia		47		27,677		27,721		3,621,411		3,636,047		90.2	%		90.2	%
Hawaii		5		5,854		5,654		344,348		337,637		93.4	%		93.5	%
Illinois		21		14,380		14,449		1,550,596		1,597,719		89.8	%		89.8	%
Indiana		9		4,831		4,765		556,143		555,310		91.3	%		90.8	%
Kansas		1		530		507		49,991		50,361		94.0	%		88.9	%
Kentucky		9		5,011		4,998		670,761		670,936		86.4	%		86.9	%
Louisiana		2		1,407		1,408		150,090		149,990		90.6	%		91.9	%
Maryland		25		19,022		18,813		1,967,352		1,968,030		91.7	%		91.8	%
Massachusetts		36		22,453		22,218		2,242,530		2,246,607		91.5	%		93.3	%
Michigan		3		1,826		1,805		260,001		255,697		89.4	%		91.3	%
Mississippi		3		1,473		1,483		220,402		221,482		82.6	%		85.1	%
Missouri		6		3,239		3,241		385,961		387,551		91.9	%		89.9	%
Nevada		15		9,115		9,149		1,315,241		1,315,510		89.7	%		89.6	%
New Hampshire		2		1,030		1,015		126,233		125,748		93.2	%		96.0	%
New Jersey		56		43,509		43,425		4,238,960		4,234,962		91.8	%		91.7	%
New Mexico		7		3,981		3,923		487,373		485,635		92.4	%		91.2	%
New York		22		20,031		19,926		1,648,585		1,646,931		91.4	%		92.0	%
North Carolina		11		6,824		6,771		761,855		763,149		91.8	%		91.7	%
Ohio		21		11,416		11,288		1,487,593		1,480,079		91.1	%		91.6	%
Oregon		3		2,156		2,155		250,130		250,450		94.0	%		94.4	%
Pennsylvania		14		9,639		9,633		1,043,786		1,040,938		86.7	%		88.0	%
Rhode Island		2		1,252		1,212		131,681		131,141		90.6	%		94.5	%
South Carolina		20		11,168		11,163		1,510,849		1,518,738		87.8	%		87.9	%
Tennessee		19		11,028		10,995		1,536,761		1,536,157		88.4	%		90.4	%
Texas		78		50,535		50,779		6,515,537		6,536,546		89.1	%		87.4	%
Utah		8		4,229		4,240		523,181		523,056		95.1	%		92.5	%
Virginia		36		27,099		26,950		2,893,850		2,894,098		90.4	%		88.0	%
Washington		6		3,598		3,589		428,678		428,603		95.7	%		90.2	%
Total Wholly-Owned Stabilized		741		505,052		502,903		56,206,949		56,263,740		91.5	%		91.0	%
Joint-Venture Stores
Alabama		2		1,172		1,156		145,206		145,146		93.3	%		90.2	%
Arizona		7		4,315		4,263		491,988		492,603		92.9	%		92.3	%
California		66		47,621		47,265		4,828,882		4,831,016		95.0	%		94.3	%
Colorado		2		1,315		1,322		158,070		159,454		91.2	%		92.9	%
Connecticut		7		5,323		5,316		611,765		611,840		92.3	%		93.3	%
Delaware		1		596		592		71,610		71,705		82.0	%		93.1	%
Florida		15		12,652		12,455		1,260,787		1,264,400		93.5	%		92.0	%
Georgia		2		1,090		1,069		150,959		152,554		90.7	%		89.4	%
Illinois		5		3,488		3,477		366,205		365,165		91.3	%		91.5	%
Indiana		5		2,257		2,214		288,575		287,973		92.0	%		91.5	%
Kansas		2		848		842		109,565		109,195		91.0	%		91.6	%
Kentucky		4		2,280		2,276		257,199		257,439		88.0	%		89.2	%
Maryland		11		9,097		8,947		865,363		862,690		91.6	%		90.7	%
Massachusetts		13		7,081		6,947		774,443		783,629		90.1	%		91.9	%
Michigan		8		4,890		4,830		615,363		614,292		92.6	%		93.9	%
Missouri		1		541		535		61,075		61,075		88.5	%		86.9	%
Nevada		3		1,818		1,805		200,312		200,098		92.6	%		93.3	%
New Hampshire		2		801		795		85,061		84,631		91.8	%		92.7	%
New Jersey		16		13,045		13,004		1,359,247		1,357,516		92.2	%		90.4	%
New Mexico		7		3,643		3,606		396,575		397,044		91.5	%		91.9	%
New York		11		10,221		10,340		868,048		873,216		92.2	%		92.4	%
Ohio		6		3,150		3,142		414,962		415,429		89.1	%		89.5	%
Oregon		1		655		654		64,970		64,970		96.1	%		92.6	%
Pennsylvania		9		6,348		6,344		699,454		697,217		90.6	%		91.0	%
Tennessee		12		6,728		6,715		877,663		878,643		91.6	%		92.5	%
Texas		13		8,515		8,449		1,131,503		1,128,126		92.7	%		95.0	%
Virginia		12		8,667		8,640		918,212		917,864		90.4	%		91.4	%
Washington, DC		1		1,693		1,547		104,690		102,492		91.0	%		91.9	%
Total Joint-Venture Stabilized		244		169,850		168,547		18,177,752		18,187,422		92.6	%		92.6	%

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			Company		Pro forma		Company		Pro forma		Company			Pro forma
Location	Number of Properties		Number of Units as of December 31, 2016 (1)		Number of Units as of December 31, 2015		Net Rentable Square Feet as of December 31, 2016 (2)		Net Rentable Square Feet as of December 31, 2015		Square Foot Occupancy % December 31, 2016			Square Foot Occupancy % December 31, 2015
Managed Stores
Alabama		10		4,997		4,994		664,213		677,723		88.4	%		88.1	%
Arizona		3		1,290		1,223		230,115		229,967		92.4	%		92.4	%
California		84		54,496		55,037		6,859,232		6,915,726		93.0	%		87.8	%
Colorado		19		10,371		10,246		1,235,236		1,229,548		85.7	%		90.4	%
Connecticut		1		475		465		62,088		61,865		94.1	%		91.1	%
Florida		36		22,830		22,975		2,772,863		2,777,588		92.3	%		90.6	%
Georgia		8		3,932		3,947		576,170		592,742		93.1	%		91.1	%
Hawaii		6		4,790		5,016		349,804		350,372		92.2	%		89.1	%
Illinois		10		5,704		5,719		618,861		618,757		83.9	%		83.7	%
Indiana		15		8,243		8,243		1,009,944		1,028,634		88.9	%		87.8	%
Kentucky		2		1,334		1,328		219,667		219,777		89.6	%		97.9	%
Louisiana		1		983		999		131,605		133,490		89.7	%		88.3	%
Maryland		17		11,938		11,689		1,136,694		1,137,701		87.9	%		87.8	%
Michigan		4		2,189		2,187		261,706		261,516		82.3	%		85.4	%
Mississippi		1		679		685		115,688		115,918		95.6	%		94.6	%
Missouri		4		2,129		2,036		251,341		230,380		85.5	%		85.4	%
Nevada		6		5,149		5,200		578,470		579,520		87.7	%		82.9	%
New Jersey		4		2,101		2,097		234,938		235,417		89.8	%		88.0	%
New Mexico		1		802		806		103,535		103,535		86.2	%		86.4	%
New York		1		2,048		2,049		88,001		88,000		93.0	%		94.5	%
North Carolina		6		2,601		2,576		373,592		373,834		85.2	%		90.6	%
Ohio		7		2,562		2,546		343,566		354,716		90.0	%		92.2	%
Oklahoma		3		1,923		1,953		335,864		344,992		82.5	%		87.2	%
Oregon		1		447		455		39,435		39,419		95.2	%		97.7	%
Pennsylvania		13		6,984		6,950		857,512		859,682		91.7	%		91.1	%
South Carolina		4		2,609		2,591		348,518		347,858		91.4	%		85.1	%
Tennessee		2		910		909		131,600		131,360		93.8	%		90.4	%
Texas		31		16,380		16,100		2,249,335		2,224,601		86.3	%		84.7	%
Utah		5		2,538		2,537		380,047		381,077		94.4	%		90.6	%
Virginia		5		3,030		3,002		302,979		303,769		91.3	%		87.9	%
Washington		1		485		493		48,738		48,792		86.9	%		85.5	%
Washington, DC		2		1,267		1,267		112,334		112,334		89.3	%		90.7	%
Puerto Rico		4		2,686		2,666		287,314		287,049		85.6	%		86.8	%
Total Managed Stabilized		317		190,902		190,986		23,311,005		23,397,659		90.1	%		88.3	%
Total Stabilized Stores		1,302		865,804		862,436		97,695,706		97,848,821		91.4	%		90.6	%

(1) Represents unit count as of March 31, 2016, which may differ from unit count as of March 31, 2015 due to unit conversions or expansions.

(2) Represents net rentable square feet as of March 31, 2016, which may differ from rentable square feet as of March 31, 2015 due to unit conversions or expansions.

The following table presents additional information regarding the occupancy of our lease-up stores by state as of March 31, 2016 and 2015. The information as of March 31, 2015 is on a pro forma basis as though all the stores owned and/or managed at March 31, 2016 were under our control as of March 31, 2015.

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Lease-up Store Data Based on Location

			Company		Pro forma		Company		Pro forma		Company			Pro forma
Location	Number of Stores		Number of Units as of March 31, 2016 (1)		Number of Units as of March 31, 2015		Net Rentable Square Feet as of March 31, 2016 (2)		Net Rentable Square Feet as of March 31, 2015		Square Foot Occupancy % March 31, 2016			Square Foot Occupancy % March 31, 2015
Wholly-Owned Stores
Arizona		1		894		896		122,092		122,457		81.5	%		46.2	%
California (3)		2		588		—		73,317		—		31.2	%		0.0	%
Connecticut		1		1,108		1,105		89,870		89,460		91.6	%		64.2	%
Florida		2		1,239		544		157,525		81,941		75.4	%		86.4	%
Georgia		3		1,880		598		219,715		52,365		62.8	%		92.1	%
Illinois		3		2,753		658		216,982		52,757		48.6	%		61.2	%
Maryland		1		988		988		103,135		103,171		91.0	%		81.3	%
Massachusetts		2		1,711		—		152,715		—		40.2	%		0.0	%
North Carolina		2		1,607		394		155,033		37,780		60.6	%		96.1	%
Oregon		1		599		—		76,397		—		76.5	%		0.0	%
South Carolina		1		652		674		58,615		58,565		89.4	%		41.4	%
Texas		8		5,023		3,720		620,220		452,175		67.7	%		47.9	%
Virginia		1		501		455		56,405		56,805		93.0	%		69.3	%
Total Wholly-Owned in Lease-up		28		19,543		10,032		2,102,021		1,107,476		66.5	%		60.1	%
Joint-Venture Stores
Arizona		1		606		—		62,200		—		53.6	%		0.0	%
California		1		610		690		59,529		59,489		88.3	%		13.4	%
Colorado		1		814		—		85,043		—		0.7	%		0.0	%
New Jersey		1		873		—		74,511		—		59.4	%		0.0	%
New York		1		1,109		—		66,950		—		41.8	%		0.0	%
Total Joint-Venture in Lease-up		5		4,012		690		348,233		59,489		45.6	%		13.4	%
Managed Stores
California		4		1,581		1,460		208,280		267,529		67.1	%		73.0	%
Colorado		4		2,811		1,187		290,421		134,819		52.1	%		27.3	%
Florida		3		1,815		849		177,227		91,083		63.5	%		65.4	%
Georgia		1		553		552		69,367		69,030		62.3	%		12.2	%
Illinois		1		674		673		46,435		46,417		86.3	%		61.9	%
Maryland		4		2,897		2,097		249,350		186,172		54.5	%		44.3	%
Massachusetts		1		902		902		70,106		70,076		62.8	%		2.6	%
Minnesota		1		643		—		62,713		—		21.3	%		0.0	%
Nevada		1		1,453		1,487		196,986		196,275		72.8	%		51.9	%
New Jersey		1		990		—		109,952		—		1.1	%		0.0	%
New York		1		344		345		33,684		33,764		96.6	%		46.6	%
North Carolina		5		2,729		1,674		310,385		200,726		53.6	%		41.9	%
Oregon		1		272		—		27,100		—		64.8	%		0.0	%
South Carolina		4		2,979		1,002		319,346		97,620		58.6	%		38.5	%
Texas		1		566		—		65,409		—		11.8	%		0.0	%
Virginia		1		455		459		51,299		51,771		92.7	%		53.7	%
Washington		1		686		733		80,730		81,230		91.6	%		13.3	%
Total Managed in Lease-up		36		22,885		13,716		2,436,650		1,568,472		57.4	%		46.5	%
Total Lease-up Stores		69		46,440		24,438		4,886,904		2,735,437		60.5	%		51.3	%

(1) Represents unit count as of March 31, 2016, which may differ from unit count as of March 31, 2015 due to unit conversions or expansions.

(2) Represents net rentable square feet as of March 31, 2016, which may differ from rentable square feet as of March 31, 2015 due to unit conversions or expansions.

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

RESULTS OF OPERATIONS

Comparison of the three months ended March 31, 2016 and 2015

Overview

Results for the three months ended March 31, 2016 included the operations of 1,018 stores (769 wholly-owned, one in a consolidated joint venture, and 248 in joint ventures accounted for using the equity method) compared to the results for the three months ended March 31, 2015, which included the operations of 835 stores (565 wholly-owned, 20 consolidated joint ventures, and 250 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,
	2016		2015		$ Change		% Change
Revenues:
Property rental	$	199,488	$	148,894	$	50,594		34.0	%
Tenant reinsurance		20,555		16,510		4,045		24.5	%
Management fees and other income		9,360		7,750		1,610		20.8	%
Total revenues	$	229,403	$	173,154	$	56,249		32.5	%

Property Rental—The increase in property rental revenues for the three months ended March 31, 2016 was the result of an increase of $36,872 associated with acquisitions completed in 2016 and 2015, and an increase of $13,087 as a result of increases in occupancy and rental rates to new and existing customers at our stabilized stores. Revenues at our lease-up stores increased by $635 for the three months ended March 31, 2016 when compared to the same period in the prior year. We acquired 23 operating stores during the three months ended March 31, 2016 and 171 operating stores during 2015. Occupancy at our wholly-owned stabilized stores increased to 91.5% at March 31, 2016, as compared to 91.0% at March 31, 2015. The achieved rental rate to new tenants for the three months ended March 31, 2016 increased an average of approximately 8% over the same period in the prior year.

Tenant Reinsurance—The increase in our tenant reinsurance revenues was due primarily to the increase in the number of stores operated. We operated 1,371 stores at March 31, 2016 compared to 1,106 stores at March 31, 2015.

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 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. We managed 601 stores as of March 31, 2016, compared to 521 as of March 31, 2015.

Expenses

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

	For the Three Months Ended March 31,
	2016		2015		$ Change		% Change
Expenses:
Property operations	$	61,112	$	47,244	$	13,868		29.4	%
Tenant reinsurance		4,311		2,928		1,383		47.2	%
Acquisition related costs		4,053		869		3,184		366.4	%
General and administrative		23,402		16,249		7,153		44.0	%
Depreciation and amortization		42,897		30,428		12,469		41.0	%
Total expenses	$	135,775	$	97,718	$	38,057		38.9	%

Property Operations—The increase in property operations expense during the three months ended March 31, 2016 was primarily the result of an increase of $13,188 associated with acquisitions completed in 2016 and 2015 and an increase of $517 associated with increases in expenses at our stabilized properties. The increases in expenses at our stabilized properties consisted primarily of increases in credit card merchant fees, property taxes and insurance. We acquired 23 operating stores during the three months ended March 31, 2016, and 171 operating stores during the year ended December 31, 2015.

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. March 31, 2016, we owned and/or managed 1,371 stores compared to 1,106 stores at March 31, 2015.

Acquisition Related Costs—These costs relate to acquisition activities during the periods indicated. The increase in these expenses for the three months ended March 31, 2016 compared to the same period in the prior year was due to an increase in the number of acquisitions completed during these periods. We completed the acquisition of 23 stores during the three months ended March 31, 2016 compared to eight stores during the same period in the prior year.

32

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, 2016 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, 2016, we owned and/or managed 1,371 stores compared to 1,106 stores at March 31, 2015. Additionally, during the three months ended March 31, 2016, we accrued a $4,000 expense related the potential settlement of a legal action. We did not observe any other 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 23 stores during three months ended March 31, 2016 and 171 stores during 2015.

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,
	2016			2015			$ Change			% Change
Other income and expenses:
Loss on earnout from prior acquisitions	$	(1,544	)	$	—		$	(1,544	)		(100.0	%)
Interest expense		(31,359	)		(21,431	)		(9,928	)		46.3	%
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes		(1,233	)		(697	)		(536	)		76.9	%
Interest income		1,714			856			858			100.2	%
Interest income on note receivable from Preferred Operating Partnership unit holder		1,213			1,213			—			—
Equity in earnings of unconsolidated real estate ventures		2,830			2,650			180			6.8	%
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners’ interests		26,923			2,857			24,066			842.4	%
Income tax expense		(2,765	)		(2,248	)		(517	)		23.0	%
Total other expense, net	$	(4,221	)	$	(16,800	)	$	12,579			(74.9	%)

Loss on Earnout from Prior Acquisition—During 2014, we acquired a portfolio of five stores. As part of this acquisition, we agreed to make an additional cash payment to the sellers if the acquired stores exceeded a specified amount of net operating income for the years ending December 31, 2015 and 2016. At the acquisition date, we recorded an estimated liability related to this provision. The operating income of these stores during the earnout period has been higher than expected, resulting in an increase in the payment due to the sellers of $1,544, which was recorded as a loss during the three months ended March 31, 2016.

Interest Expense—The increase in interest expense during the three months ended March 31, 2016 was the result of increases in debt over the same period in the prior year. The total face value of our debt, including our lines of credit, was $3,741,731 at March 31, 2016 compared to $2,441,547 at March 31, 2015.

Non-cash Interest Expense Related to Amortization of Discount on Equity Component of Exchangeable Senior Notes—Represents the amortization of the discounts related to the equity components of the exchangeable senior notes issued by our Operating Partnership. The 2013 Notes and 2015 Notes both have an effective interest rate of 4.0% relative to the carrying amount of the liability. The increase for the three months ended March 31, 2016 when compared to the same period in the prior year is due to the issuance of $575,000 principal amount of the 2015 Notes in September 2015.

33

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, 2016 related primarily to the increase in notes receivable when compared to the same period in the prior year. We had $85,461 of notes receivable included in other assets on the condensed consolidated balance sheets as of March 31, 2016, compared to only $14,054 as of March 31, 2015. The primary increase was due to a note receivable of $84,331 that we issued on October 1, 2015 related to the acquisition of SmartStop Self Storage LLC and related transactions.

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, 2016 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. This increase was offset by the lower income in our VRS joint venture (defined below) due to the joint venture having six fewer stores subsequent to the Company’s acquisition of these stores on February 2, 2016.

Equity in Earnings of Unconsolidated Real Estate Ventures—Gain on Sale of Real Estate Assets and Purchase of Joint Venture Partners’ Interests—On February 2, 2016, we acquired six stores from our VRS Self Storage LLC joint venture (“VRS”) in a step acquisition. We own 45.04% of VRS, with the other 54.96% owned by affiliates of Prudential Real Estate (“Prudential”). VRS created a new subsidiary, Extra Space Properties 122 LLC (“ESP 122”) and transferred six stores into ESP 122. VRS then distributed ESP 122 to Prudential and us on a pro rata basis. This distribution was accounted for as a spinoff, and was therefore recorded at the net carrying amount of the properties of $17,261, Immediately after the distribution, we acquired Prudential’s 54.96% interest in ESP 122 for $53,940, resulting in 100% ownership of ESP 122 and the related six stores. Based on the purchase price of Prudential’s share of ESP 122, we determined that the fair value of our investment in ESP 122 immediately prior to the acquisition of Prudential’s share was $44,184, and we recorded a gain of $26,923 as a result of re-measuring to fair value our existing equity interest in ESP 122.

During March 2015, one of our joint ventures sold a store located in New York to a third party and recognized a gain of $60,495. 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, 2016, the increase in income tax expense is the result of an increase in income earned by our “TRS” when compared to the same period in the prior year.

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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,
	2016			2015			$ Change			% Change
Net income allocated to noncontrolling interests:
Net income allocated to Preferred Operating Partnership noncontrolling interests	$	(3,180	)	$	(2,926	)	$	(254	)		8.7	%
Net income allocated to Operating Partnership and other noncontrolling interests		(3,635	)		(1,968	)		(1,667	)		84.7	%
Total income allocated to noncontrolling interests:	$	(6,815	)	$	(4,894	)	$	(1,921	)		39.3	%

Net Income Allocated to Preferred Operating Partnership Noncontrolling Interests—Income allocated to the Preferred Operating Partnership noncontrolling interests for the three months ended March 31, 2016 represents the fixed distributions paid to holders of the Series A Units, Series B Units, Series C Units and Series D Units, plus approximately 0.65% 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 4.2% and 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, 2016 and 2015, respectively.

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,
	2016			2015
Net income attributable to common stockholders	$	82,592		$	53,742
Adjustments:
Real estate depreciation		36,436			26,118
Amortization of intangibles		4,736			2,797
Loss on earnout from prior acquisitions		1,544			—
Unconsolidated joint venture real estate depreciation and amortization		1,015			1,057
Unconsolidated joint venture gain on sale of real estate and purchase of partners’ interests		(26,923	)		(2,857	)
Distributions paid on Series A Preferred Operating Partnership units		(1,271	)		(1,274	)
Income allocated to Operating Partnership noncontrolling interests		6,816			4,893
Funds from operations attributable to common stockholders	$	104,945		$	84,476

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
	2016			2015			Change
Same-store rental and tenant reinsurance revenues	$	170,471		$	156,233			9.1	%
Same-store operating and tenant reinsurance expenses		48,576			47,673			1.9	%
Same-store net operating income	$	121,895		$	108,560			12.3	%
Non same-store rental and tenant reinsurance revenues	$	49,572		$	9,171			440.5	%
Non same-store operating and tenant reinsurance expenses	$	16,847		$	2,499			574.1	%
Total rental and tenant reinsurance revenues	$	220,043		$	165,404			33.0	%
Total operating and tenant reinsurance expenses	$	65,423		$	50,172			30.4	%
Same-store square foot occupancy as of quarter end		92.8	%		92.1	%
Properties included in same-store		564			564

Same-store revenues for the three months ended March 31, 2016 increased due to gains in occupancy and higher rental rates for both new and existing customers. Expenses were higher for the three months ended March 31, 2016 due to increases in tenant reinsurance expense, credit card merchant fees, property taxes and insurance. Increases in expenses were partially offset by decreases in utility expense, snow removal and repairs and maintenance during the three months ended March 31, 2016.

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CASH FLOWS

Cash flows provided by operating activities were $95,466 and $87,439, respectively for the three months ended March 31, 2016 and 2015. The increase was primarily due to an increase in net income of $30,771, and an increase in depreciation and amortization of $12,469. These increases were offset by a non-cash gain on the purchase of joint venture partners’ interests of $26,923 for the three months ended March 31,2016. This non-cash gain was the result of a step acquisition of six stores that were previously owned by our VRS joint venture.

Cash used in investing activities was $258,668 and $91,511, respectively, for the three months ended March 31, 2016 and 2015. The increase was primarily due to an increase in cash paid for the acquisition of real estate assets of $157,738. We purchased 23 stores during the three months ended March 31, 2016, compared to only eight stores purchased during the three months ended March 31, 2015. There was also an increase of $10,656 in cash paid for the issuance of notes receivable for the three months ended March 31, 2016 when compared to the same period in the prior year.

Cash provided by financing activities was $137,156 and $1,713, respectively, for the three months ended March 31, 2016 and 2015. The change related primarily to an increase in net proceeds from the sale of common stock of $73,574 and a decrease in principal payments on notes payable and lines of credit of $196,019 for the three months ended March 31, 2016 when compared to the same period in the prior year. These increases were offset by a decrease in proceeds from notes payable and lines of credit of $94,792, an increase in the cash paid for the repurchase of exchangeable senior notes of $19,639, and an increase in the cash paid for dividends of $19,095.

LIQUIDITY AND CAPITAL RESOURCES

As of March 31, 2016, we had $49,753 available in cash and cash equivalents. We intend to use this cash for 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 2015 and the first three months of 2016, 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 period presented. All of our lines of credit are guaranteed by us and secured by mortgages on certain real estate assets.

	As of March 31, 2016
Line of Credit	Amount Drawn		Capacity		Interest Rate			Origination Date	Maturity	Basis Rate (1)	Notes
Credit Line 1	$	75,000	$	180,000		2.1	%	6/4/2010	6/30/2018	LIBOR plus 1.7%		(2)
Credit Line 2		4,000		50,000		2.2	%	11/16/2010	2/13/2017	LIBOR plus 1.8%		(3)
Credit Line 3		31,000		80,000		2.1	%	4/29/2011	11/18/2016	LIBOR plus 1.7%		(3)
Credit Line 4		6,000		50,000		2.1	%	9/29/2014	9/29/2017	LIBOR plus 1.7%		(3)
	$	116,000	$	360,000

(1) 30-day USD LIBOR

(2) One two-year extension available

(3) Two one-year extensions available

As of March 31, 2016, we had $3,741,731 face value of debt, resulting in a debt to total enterprise value ratio of 22.9%. As of March 31, 2016, the ratio of total fixed-rate debt and other instruments to total debt was 77.8% (including $2,009,062 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, 2016 was 3.2%. 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, 2016.

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.

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;

• 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.

Typically, we invest in or form consolidated special purpose entities to assist us in obtaining secured permanent financing at attractive terms. Permanent financing may be structured as a mortgage loan on a single property, or on a group of properties, and generally requires us to provide a mortgage lien on the property or properties in favor of an institutional third party, as a joint venture with a third party, or as a securitized financing. For securitized financings, we create special purpose entities to own the properties. These special purpose entities, which are common in the real estate industry, are structured so that they would not be consolidated in a bankruptcy proceeding involving a parent company. We decide upon the structure of the financing based upon the best terms then available to us and whether the proposed financing is consistent with our other business objectives. For accounting purposes, we include the outstanding securitized debt of special purpose entities owning consolidated properties as part of our consolidated indebtedness.

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We may from time to time seek to retire or repurchase our outstanding debt, as well as shares of common stock or other securities in open market purchases, privately negotiated transactions or otherwise. Such repurchases, if any, will depend on prevailing market conditions, our liquidity requirements, contractual restrictions and other factors. The amounts involved may be material.

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, 2016, we had $3,741,731 in total face value of debt, of which $728,866 was subject to variable interest rates without floors or caps (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 $7,289 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, 2016				December 31, 2015
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	130,856	$	120,230	$	128,216	$	120,230
Fixed rate notes receivable	$	85,927	$	84,331	$	86,814	$	84,331
Fixed rate notes payable and notes payable to trusts	$	2,329,420	$	2,271,925	$	1,828,486	$	1,806,904
Exchangeable senior notes	$	767,992	$	640,725	$	770,523	$	660,364

The fair value of our note receivable from Preferred Operating Partnership unit holders and other notes receivable was based on the discounted estimated future cash flows of the note (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

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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.

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PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

We are involved in various legal proceedings and are subject to various claims and complaints arising in the ordinary course of business. Because litigation is inherently unpredictable, the outcome of these matters cannot presently be determined with any degree of certainty. In accordance with applicable accounting guidance, management establishes an accrued liability for litigation when those matters present loss contingencies that are both probable and reasonably estimable. In such cases, there may be an exposure to loss in excess of any amounts accrued. The estimated loss, if any, is based upon currently available information and is subject to significant judgment, a variety of assumptions, and known and unknown uncertainties. Therefore, any estimate(s) of loss disclosed below represents what management believes to be an estimate of loss only for certain matters meeting these criteria and does not represent our maximum loss exposure. We could in the future incur judgments or enter into settlements of claims that could have a material adverse effect on our results of operations in any particular period, notwithstanding the fact that we are currently vigorously defending any legal proceedings against us.

We currently have a legal proceeding pending against us that includes causes of action alleging wrongful foreclosure, violations of various state specific self-storage statutes, and violations of various consumer fraud acts. As a result of this litigation matter, we recorded a liability of $4,000,000 during the three months ended March 31, 2016, which is included in other liabilities on the condensed consolidated balance sheet.

ITEM 1A. RISK FACTORS

There have been no material changes in our risk factors from those disclosed in our 2015 Annual Report on Form 10-K.

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

None.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not Applicable.

ITEM 5. OTHER INFORMATION

None.

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, 2016 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.

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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 6, 2016	/s/ Spencer F. Kirk
	Spencer F. Kirk
	Chief Executive Officer (Principal Executive Officer)
Date: May 6, 2016	/s/ P. Scott Stubbs
	P. Scott Stubbs
	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer)

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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 6, 2016	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 6, 2016	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, 2016 (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 6, 2016

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, 2016 (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 6, 2016

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	Apr. 30, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2016
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		125,207,702

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Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets:
Real estate assets, net	$ 5,933,959	$ 5,689,309
Investments in unconsolidated real estate ventures	89,224	103,007
Cash and cash equivalents	49,753	75,799
Restricted cash	32,003	30,738
Receivables from related parties and affiliated real estate joint ventures	15,739	2,205
Other assets, net	170,741	170,349
Total assets	6,291,419	6,071,407
Liabilities, Noncontrolling Interests and Equity:
Notes payable, net	2,842,076	2,758,567
Exchangeable senior notes, net	606,887	623,863
Notes payable to trusts, net	117,225	117,191
Lines of credit	116,000	36,000
Accounts payable and accrued expenses	77,108	82,693
Other liabilities	106,738	80,489
Total liabilities	$ 3,866,034	$ 3,698,803
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, 125,129,324 and 124,119,531 shares issued and outstanding at March 31, 2016 and December 31, 2015, respectively	$ 1,251	$ 1,241
Additional paid-in capital	2,506,551	2,431,754
Accumulated other comprehensive loss	(35,939)	(6,352)
Accumulated deficit	(328,801)	(337,566)
Total Extra Space Storage Inc. stockholders' equity	2,143,062	2,089,077
Noncontrolling interest represented by Preferred Operating Partnership units, net of $120,230 notes receivable	80,371	80,531
Noncontrolling interests in Operating Partnership	201,791	202,834
Other noncontrolling interests	161	162
Total noncontrolling interests and equity	2,425,385	2,372,604
Total liabilities, noncontrolling interests and equity	$ 6,291,419	$ 6,071,407

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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
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	125,129,324	124,119,531
Common stock, shares outstanding	125,129,324	124,119,531
Note receivable from noncontrolling interest represented by Preferred Operating Partnership units	$ 120,230	$ 120,230

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Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Property rental	$ 199,488	$ 148,894
Tenant reinsurance	20,555	16,510
Management fees and other income	9,360	7,750
Total revenues	229,403	173,154
Expenses:
Property operations	61,112	47,244
Tenant reinsurance	4,311	2,928
Acquisition related costs	4,053	869
General and administrative	23,402	16,249
Depreciation and amortization	42,897	30,428
Total expenses	135,775	97,718
Income from operations	93,628	75,436
Loss on earnout from prior acquisition	(1,544)
Interest expense	(31,359)	(21,431)
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	(1,233)	(697)
Interest income	1,714	856
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	62,419	55,377
Equity in earnings of unconsolidated real estate ventures	2,830	2,650
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners' interests	26,923	2,857
Income tax expense	(2,765)	(2,248)
Net income	89,407	58,636
Net income allocated to Preferred Operating Partnership noncontrolling interests	(3,180)	(2,926)
Net income allocated to Operating Partnership and other noncontrolling interests	(3,635)	(1,968)
Net income attributable to common stockholders	$ 82,592	$ 53,742
Earnings per common share
Basic	$ 0.66	$ 0.46
Diluted	$ 0.66	$ 0.46
Weighted average number of shares
Basic	124,754,174	116,117,615
Diluted	131,956,094	122,595,718
Cash dividends paid per common share	$ 0.59	$ 0.47

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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 89,407	$ 58,636
Other comprehensive income (loss):
Change in fair value of interest rate swaps	(31,148)	(6,593)
Total comprehensive income	58,259	52,043
Less: comprehensive income attributable to noncontrolling interests	5,254	4,617
Comprehensive income attributable to common stockholders	$ 53,005	$ 47,426

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Condensed Consolidated Statement of Noncontrolling Interests and Equity - 3 months ended Mar. 31, 2016 - USD ($) $ in Thousands	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 Loss [Member]	Accumulated Deficit [Member]
Balances at Dec. 31, 2015	$ 2,372,604	$ 14,189	$ 41,902	$ 10,730	$ 13,710	$ 202,834	$ 162	$ 1,241	$ 2,431,754	$ (6,352)	$ (337,566)
Balances (in shares) at Dec. 31, 2015	124,119,531							124,119,531
Issuance of common stock upon the exercise of options	$ 13								13
Issuance of common stock upon the exercise of options (in shares)								850
Restricted stock grants issued (in shares)								47,768
Restricted stock grants cancelled (in shares)								(1,354)
Issuance of common stock, net of offering costs	73,574							$ 8	73,566
Issuance of common stock, net of offering costs (in shares)								831,300
Compensation expense related to stock-based awards	1,710								1,710
Redemption of Operating Partnership units for common stock						(12)			12
Redemption of Operating Partnership units for common stock (in shares)								320
Repurchase of equity portion of 2013 exchangeable senior notes	(774)							$ 2	(776)
Repurchase of equity portion of 2013 exchangeable senior notes (in shares)								130,909
Net income	89,407	1,838	629	542	171	3,636	(1)				82,592
Other comprehensive income loss	(31,148)	(210)				(1,351)				(29,587)
Tax effect from vesting of restricted stock grants and stock option exercises	272								272
Distributions to Operating Partnership units held by noncontrolling interests	(6,446)	(1,788)	(629)	(542)	(171)	(3,316)
Dividends paid on common stock at $0.59 per share	(73,827)										(73,827)
Balances at Mar. 31, 2016	$ 2,425,385	$ 14,029	$ 41,902	$ 10,730	$ 13,710	$ 201,791	$ 161	$ 1,251	$ 2,506,551	$ (35,939)	$ (328,801)
Balances (in shares) at Mar. 31, 2016	125,129,324							125,129,324

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Condensed Consolidated Statement of Noncontrolling Interests and Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Stockholders' Equity [Abstract]
Dividends paid on common stock, per share	$ 0.59	$ 0.47

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 89,407	$ 58,636
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	42,897	30,428
Amortization of deferred financing costs	2,823	1,598
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	1,233	697
Non-cash interest expense related to amortization of premium on notes payable	(354)	(747)
Compensation expense related to stock-based awards	1,710	1,142
Gain on sale of real estate assets and purchase of joint venture partners' interests	(26,923)	(2,857)
Loss on real estate transactions and earnout from prior acquisition	(1,544)
Distributions from unconsolidated real estate ventures in excess of earnings	998	2,601
Changes in operating assets and liabilities:
Receivables from related parties and affiliated real estate joint ventures	(2,878)	(2,367)
Other assets	(5,276)	(2,637)
Accounts payable and accrued expenses	(5,642)	6,032
Other liabilities	(985)	(5,087)
Net cash provided by operating activities	95,466	87,439
Cash flows from investing activities:
Acquisition of real estate assets	(234,820)	(77,082)
Development and redevelopment of real estate assets	(6,543)	(3,140)
Change in restricted cash	(1,265)	(10,105)
Investment in unconsolidated real estate ventures	(4,794)
Return of investment in unconsolidated real estate ventures	318
Purchase/issuance of notes receivable	(10,656)
Purchase of equipment and fixtures	(908)	(1,184)
Net cash used in investing activities	(258,668)	(91,511)
Cash flows from financing activities:
Proceeds from the sale of common stock, net of offering costs	73,574
Repurchase of exchangeable senior notes	(19,639)
Proceeds from notes payable and lines of credit	195,976	290,768
Principal payments on notes payable and lines of credit	(32,859)	(228,878)
Deferred financing costs	(1,286)	(1,419)
Net proceeds from exercise of stock options	13	970
Proceeds from termination of interest rate cap	1,650
Dividends paid on common stock	(73,827)	(54,732)
Distributions to noncontrolling interests	(6,446)	(4,996)
Net cash provided by financing activities	137,156	1,713
Net decrease in cash and cash equivalents	(26,046)	(2,359)
Cash and cash equivalents, beginning of the period	75,799	47,663
Cash and cash equivalents, end of the period	49,753	45,304
Supplemental schedule of cash flow information
Interest paid	24,873	21,754
Income taxes paid	4,835	661
Redemption of Operating Partnership units held by noncontrolling interests for common stock:
Noncontrolling interests in Operating Partnership	(12)
Common stock and paid-in capital	12
Tax effect from vesting of restricted stock grants and option exercises
Other assets	272	644
Paid-in capital	(272)	(644)
Acquisitions of real estate assets
Real estate assets, net		11,009
Receivables from related parties and affiliated real estate joint ventures		$ (11,009)
Distribution of real estate from investments in unconsolidated real estate ventures
Real estate assets, net	17,261
Investments in unconsolidated real estate ventures	$ (17,261)

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Organization

3 Months Ended

Mar. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [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, or 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, 2016, the Company had direct and indirect equity interests in 1,018 stores. In addition, the Company managed 353 stores for third parties, bringing the total number of stores which it owns and/or manages to 1,371. These stores are located in 37 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.

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Basis of Presentation

3 Months Ended

Mar. 31, 2016

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, 2016, are not necessarily indicative of results that may be expected for the year ending December 31, 2016. The condensed consolidated balance sheet as of December 31, 2015 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, 2015, as filed with the Securities and Exchange Commission.

Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“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 was originally effective for reporting periods beginning after December 15, 2016. Entities can transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. In July 2015, the FASB approved a one-year deferral of the effective date of the standard. The new standard will now become effective for annual and interim periods beginning after December 15, 2017 with early adoption on the original effective date permitted. The Company has not yet selected a transition method. The Company is currently assessing the impact of the adoption of ASU 2014-09 on the Company’s 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 variable interest entity (“VIE”), and eliminates the presumption that a general partner should consolidate a limited partnership. The Company adopted this guidance effective January 1, 2016. The adoption of this guidance did not have a significant impact on the Company’s condensed consolidated financial statements.

In April 2015, the FASB issued ASU 2015-05, “Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40) – Customers Accounting for Fees Paid in a Cloud Computing Arrangement,” which provides guidance regarding the accounting for fees paid by a customer in cloud computing arrangements. If a cloud computing arrangement includes a software license, the payment of fees should be accounted for in the same manner as the acquisition of other software licenses. If there is no software license, the fees should be accounted for as a service contract. The guidance is effective in fiscal years beginning after December 15, 2015 and early adoption is permitted. An entity can elect to adopt the amendments either (1) prospectively to all arrangements entered into or materially modified after the effective date or (2) retrospectively. The Company adopted this guidance prospectively effective January 1, 2016. The adoption of this guidance did not have a significant impact on the Company’s condensed consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which requires lessees to recognize the following for all leases (with the exception of short-term leases) at the commencement date: (1) a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and (2) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Lessor accounting is largely unchanged under ASU 2016-02. The guidance is effective for annual and interim periods beginning after December 15, 2018. The Company is currently assessing the impact of the adoption of ASU 2016-02 on the Company’s consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, “Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” ASU 2016-09 simplifies several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. This ASU is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the new guidance to determine the impact it may have on its consolidated financial statements.

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Fair Value Disclosures

3 Months Ended

Mar. 31, 2016

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 FASB’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, 2016, 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, 2016, aggregated by the level in the fair value hierarchy within which those measurements fall.

	Fair Value Measurements at Reporting Date Using
Description	March 31, 2016			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	$	463		$	—	$	463		$	—
Other liabilities - Cash Flow Hedge Swap Agreements	$	(34,708	)	$	—	$	(34,708	)	$	—

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, 2016 or December 31, 2015.

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, the Company would recognize a loss on the assets held for sale. The operations of assets held for sale or sold during the period are presented as part of normal operations for all periods presented. As of March 31, 2016, the Company had eight stores classified as held for sale. The estimated fair value less selling costs of each of these assets is greater than the carrying value of the assets, and therefore no loss has been recorded.

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, 2016 and December 31, 2015 approximate fair value.

The fair values of the Company’s notes receivable from Preferred Operating Partnership unit holders and other fixed rate notes receivable 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, 2016				December 31, 2015
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	130,856	$	120,230	$	128,216	$	120,230
Fixed rate notes receivable	$	85,927	$	84,331	$	86,814	$	84,331
Fixed rate notes payable and notes payable to trusts	$	2,329,420	$	2,271,925	$	1,828,486	$	1,806,904
Exchangeable senior notes	$	767,992	$	640,725	$	770,523	$	660,364

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Earnings Per Common Share

3 Months Ended

Mar. 31, 2016

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, 2016 and 2015, options to purchase approximately 67,812 and 19,762 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 $86.91.

	For the Three Months Ended March 31,
	2016				2015
	Number of Units		Equivalent Shares (if converted)		Number of Units		Equivalent Shares (if converted)
Series B Units		1,676,087		482,133		1,676,087		638,850
Series C Units		704,016		341,032		704,016		451,884
Series D Units		548,390		157,747		548,390		209,022
		2,928,493		980,912		2,928,493		1,299,756

The Operating Partnership had $65,725 of its 2.375% Exchangeable Senior Notes due 2033 (the “2013 Notes”) issued and outstanding as of March 31, 2016. The 2013 Notes could potentially have a dilutive impact on the Company’s earnings per share calculations. The 2013 Notes are exchangeable by holders into shares of the Company’s common stock under certain circumstances per the terms of the indenture governing the 2013 Notes. The exchange price of the 2013 Notes was $54.87 per share as of March 31, 2016, 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 2013 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.

The Operating Partnership had $575,000 of its 3.125% Exchangeable Senior Notes due 2035 (the “2015 Notes”) issued and outstanding as of March 31, 2016. The 2015 Notes could potentially have a dilutive impact on the Company’s earnings per share calculations. The 2015 Notes are exchangeable by holders into shares of the Company’s common stock under certain circumstances per the terms of the indenture governing the 2015 Notes. The exchange price of the 2015 Notes was $95.40 per share as of March 31, 2016, 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 2015 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.

Although the Company has retained the right to satisfy the exchange obligation in excess of the accreted principal amount of the 2013 Notes and 2015 Notes in cash and/or common stock, Accounting Standards Codification (“ASC”) 260, “Earnings per Share,” requires an assumption that shares would be used to pay such exchange obligation, 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, 2016 and 2015, 441,598 and 682,502 shares, respectively, related to the 2013 Notes were included in the computation for diluted earnings per share. For the three months ended March 31, 2016, no shares related to the 2015 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 three months ended March 31, 2015, no shares related to the 2015 Notes were included in the computation for diluted earnings per share as the 2015 Notes were not outstanding during that time 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, 2016 of $41,902 by the closing price of the Company’s common stock as of March 31, 2016 of $93.46 per share. Assuming full exchange for common shares as of March 31, 2016, 448,342 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, 2016 of $29,639 by the closing price of the Company’s common stock as of March 31, 2016 of $93.46 per share. Assuming full exchange for common shares as of March 31, 2016, 317,130 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, 2016 of $13,710 by the closing price of the Company’s common stock as of March 31, 2016 of $93.46 per share. Assuming full exchange for common shares as of March 31, 2016, 146,694 shares would have been issued to the holders of the Series D Units.

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

	For the Three Months Ended March 31,
	2016			2015
Net income attributable to common stockholders	$	82,592		$	53,742
Earnings and dividends allocated to participating securities		(165	)		(119	)
Earnings for basic computations		82,427			53,623
Earnings and dividends allocated to participating securities		—			119
Income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units) and Operating Partnership		5,474			3,635
Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units)		(1,271	)		(1,274	)
Net income for diluted computations	$	86,630		$	56,103
Weighted average common shares outstanding:
Average number of common shares outstanding - basic		124,754,174			116,117,615
Series A Units		875,480			875,480
OP Units		5,621,470			4,365,879
Unvested restricted stock awards included for treasury stock method		—			282,903
Shares related to exchangeable senior notes and dilutive stock options		704,970			953,841
Average number of common shares outstanding - diluted		131,956,094			122,595,718
Earnings per common share
Basic	$	0.66		$	0.46
Diluted	$	0.66		$	0.46

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Store Acquisitions

3 Months Ended

Mar. 31, 2016

Business Combinations [Abstract]

Store Acquisitions

5. STORE ACQUISITIONS

The following table shows the Company’s acquisitions of operating stores for the three months ended March 31, 2016, and does not include purchases of raw land or improvements made to existing assets:

			Consideration Paid							Fair Value
Property Location	Number of Stores	Date of Acquisition	Total		Cash Paid		Net Liabilities/ (Assets) Assumed			Real estate assets
New Mexico	1	3/29/2016	$	10,958	$	10,928	$	30		$	10,958
New Mexico	1	3/29/2016		17,940		17,905		35			17,940
Georgia	3	3/29/2016		25,087		25,069		18			25,087
Texas	1	3/21/2016		9,994		9,969		25			9,994
Illinois	1	2/25/2016		16,721		16,738		(17	)		16,721
Massachusetts	1	2/16/2016		16,169		16,174		(5	)		16,169
Florida, Maryland, Nevada, New York, Tennessee (1)	6	2/2/2016		53,898		53,940		(42	)		98,082
Texas	3	1/14/2016		22,625		22,523		102			22,625
Florida	1	1/12/2016		9,001		8,980		21			9,001
Texas	3	1/7/2016		27,537		27,435		102			27,537
New Mexico	2	1/7/2016		15,607		15,495		112			15,607
2016 Totals	23		$	225,537	$	225,156	$	381		$	269,721

(1) - On February 2, 2016, the Company acquired six stores from its VRS Self Storage LLC joint venture (“VRS”) in a step acquisition. The Company owns 45.04% of VRS, with the other 54.96% owned by affiliates of Prudential Real Estate (“Prudential”). VRS created a new subsidiary, Extra Space Properties 122 LLC (“ESP 122”) and transferred six stores into ESP 122. VRS then distributed ESP 122 to the Company and Prudential on a pro rata basis. This distribution was accounted for as a spinoff, and was therefore recorded at the net carrying amount of the properties of $17,261. Immediately after the distribution, the Company acquired Prudential’s 54.96% interest in ESP 122 for $53,940, resulting in 100% ownership of ESP 122 and the related six stores. Based on the purchase price of Prudential’s share of ESP 122, the Company determined that the fair value of its investment in ESP 122 immediately prior to the acquisition of Prudential’s share was $44,184, and the Company recorded a gain of $26,923 as a result of re-measuring to fair value its existing equity interest in ESP 122. This gain is included in equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners’ interests on the Company’s condensed consolidated statements of operations.

Losses on Earnout from Prior Acquisition

In December 2014, the Company acquired a portfolio of five stores located in New Jersey and Virginia. As part of this acquisition, the Company agreed to make an additional cash payment to the sellers if the acquired stores exceeded a specified amount of net operating income for the years ending December 31, 2015 and 2016. At the acquisition date, the Company recorded an estimated liability related to this earnout provision. The operating income of these stores during the earnout period has been higher than expected, resulting in an increase in the estimate of the amount due to the sellers of $1,544, which was recorded as a loss and included in loss earnout from prior acquisitions in the Company’s condensed consolidated statements of operations for three months ended March 31, 2016.

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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, 2016

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

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

On February 2, 2016, the Company acquired six operating stores from VRS in a step acquisition. The Company recognized a non-cash gain of $26,923 related to this transaction as a result of revaluing its existing equity interest upon the purchase of the remaining interest. See the Store Acquisitions footnote for more information.

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 written off as part of the total consideration. 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.

Baychester Investments LLC [Member]

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

6. INVESTMENTS IN UNCONSOLIDATED REAL ESTATE VENTURES

On March 31, 2016, the Company entered into a new joint venture, ESS-H Baychester Investments LLC (“Baychester”). Baychester owns a single store in New York. The Company contributed $4,794 for a 44.4% interest in Baychester. The Company accounts for its investment in Baychester under the equity method of accounting.

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Variable Interests

3 Months Ended

Mar. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Variable Interests

7. 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 equal to 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 assets and 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, 2016:

	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		—
Unamortized debt issuance costs		(2,365	)
	$	117,225		$	3,590	$	116,000	$	—

The Company had no consolidated VIEs during the three months ended March 31, 2016.

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Derivatives

3 Months Ended

Mar. 31, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

8. 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, 2016 and 2015, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. During the remainder of 2016, the Company estimates that an additional $16,403 will be reclassified as an increase to interest expense.

The Company held 29 derivative financial instruments which had a total combined notional amount of $1,850,111 as of March 31, 2016.

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, 2016			December 31, 2015
Derivatives designated as hedging instruments:	Fair Value
Other assets	$	463		$	4,996
Other liabilities	$	(34,708	)	$	(6,991	)

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		2016			2015
Swap Agreements	Interest expense	$	(4,454	)	$	(2,297	)

	Gain (loss) recognized in OCI For the Three Months Ended March 31,						Location of amounts reclassified from OCI into income	Gain (loss) reclassifed from OCI For the Three Months Ended March 31,
Type	2016			2015				2016			2015
Swap Agreements	$	(34,960	)	$	(8,875	)	Interest expense	$	(4,454	)	$	(2,297	)

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, 2016, the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $34,708. As of March 31, 2016, the Company had not posted any collateral related to these agreements. If the Company had breached any of these provisions as of March 31, 2016, it could have been required to settle its obligations under the agreements at their termination value of $37,240 including accrued interest.

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Exchangeable Senior Notes

3 Months Ended

Mar. 31, 2016

Text Block [Abstract]

Exchangeable Senior Notes

9. EXCHANGEABLE SENIOR NOTES

In September 2015, the Operating Partnership issued $575,000 of its 3.125% Exchangeable Senior Notes due 2035. Costs incurred to issue the 2015 Notes were approximately $11,992, consisting primarily of a 2% underwriting fee. 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 exchangeable senior notes, net, in the condensed consolidated balance sheets. The 2015 Notes are general unsecured senior obligations of the Operating Partnership and are fully guaranteed by the Company. Interest is payable on April 1 and October 1 of each year beginning April 1, 2016, until the maturity date of October 1, 2035. The Notes bear interest at 3.125% per annum and contain an exchange settlement feature, which provides that the 2015 Notes may, under certain circumstances, be exchangeable for cash (for the principal amount of the 2015 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 2015 Notes as of March 31, 2016 was approximately 10.48 shares of the Company’s common stock per $1,000 principal amount of the 2015 Notes.

The Operating Partnership may redeem the 2015 Notes at any time to preserve the Company’s status as a REIT. In addition, on or after October 5, 2020, the Operating Partnership may redeem the 2015 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 2015 Notes. The holders of the 2015 Notes have the right to require the Operating Partnership to repurchase the 2015 Notes for cash, in whole or in part, on October 1 of the years 2020, 2025 and 2030 (unless the Operating Partnership has called the 2015 Notes for redemption), and upon the occurrence of certain designated events, in each case for a repurchase price equal to 100% of the principal amount of the 2015 Notes plus accrued and unpaid interest. Certain events are considered “Events of Default,” as defined in the indenture governing the 2015 Notes, which may result in the accelerated maturity of the 2015 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 2013 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 exchangeable senior notes, net, in the condensed consolidated balance sheets. The 2013 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 2013 Notes bear interest at 2.375% per annum and contain an exchange settlement feature, which provides that the 2013 Notes may, under certain circumstances, be exchangeable for cash (for the principal amount of the 2013 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 2013 Notes as of March 31, 2016 was approximately 18.22 shares of the Company’s common stock per $1,000 principal amount of the 2013 Notes.

The Operating Partnership may redeem the 2013 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 2013 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 2013 Notes. The holders of the 2013 Notes have the right to require the Operating Partnership to repurchase the 2013 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 2013 Notes plus accrued and unpaid interest. Certain events are considered “Events of Default,” as defined in the indenture governing the 2013 Notes, which may result in the accelerated maturity of the 2013 Notes.

Additionally, the 2013 Notes can be exchanged during any calendar quarter, if the last reported sale price of the common stock of the Company is greater than or equal to 130% of the exchange price for at least 20 trading days during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter. The price of the Company’s common stock exceeded 130% of the exchange price for the required time period for the 2013 Notes during the quarter ended March 31, 2016. Therefore, holders of the 2013 Notes may elect to exchange such notes during the quarter ended June 30, 2016.

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 2013 Notes and 2015 Notes separately. The equity components are included in paid-in capital in stockholders’ equity in the condensed consolidated balance sheets, and the value of the equity components are treated as original issue discount for purposes of accounting for the debt components. The discounts are being amortized as interest expense over the remaining period of the debt through its first redemption date: July 1, 2018 for the 2013 Notes, and October 1, 2020 for the 2015 Notes. The effective interest rate on the liability components of both the 2013 Notes and the 2015 Notes is 4.0%, which approximates the market rate of interest of similar debt without exchange features (i.e. nonconvertible debt) at the time of issuance.

Information about the Company’s 2013 Notes and 2015 Notes, including the total carrying amounts of the equity components, the principal amounts of the liability components, the unamortized discounts and the net carrying amounts was as follows for the periods indicated:

	March 31, 2016			December 31, 2015
Carrying amount of equity component - 2013 Notes	$	—		$	—
Carrying amount of equity component - 2015 Notes		22,597			22,597
Carrying amount of equity components	$	22,597		$	22,597
Principal amount of liability component 2013 Notes	$	65,725		$	85,364
Principal amount of liability component 2015 Notes		575,000			575,000
Unamortized discount - equity component - 2013 Notes		(1,827	)		(2,605	)
Unamortized discount - equity component - 2015 Notes		(20,533	)		(21,565	)
Unamortized cash discount - 2013 Notes		(438	)		(633	)
Unamortized debt issuance costs		(11,040	)		(11,698	)
Net carrying amount of liability components	$	606,887		$	623,863

The amount of interest cost recognized relating to the contractual interest rates and the amortization of the discounts on the liability components of the Notes were as follows for the periods indicated:

	For the Three Months Ended March 31,
	2016		2015
Contractual interest	$	4,882	$	1,484
Amortization of discount		1,233		697
Total interest expense recognized	$	6,115	$	2,181

Repurchases of 2013 Notes

During February 2016, the Company repurchased a total principal amount of $19,639 of the 2013 Notes. The Company paid cash for the principal amount, and issued a total of 130,909 shares of common stock valued at $11,380 for the exchange value in excess of the principal amount. The Company allocated the value of the consideration paid to repurchase the 2013 Notes (1) to the extinguishment of the liability component and (2) to the reacquisition of the equity component. The amount allocated to the extinguishment of the liability component is equal to the fair value of that component immediately prior to extinguishment. The difference between the consideration attributed to the extinguishment of the liability component and the sum of (a) the net carrying amount of the repurchased liability component, and (b) the related unamortized debt issuance costs, is recognized as a gain on debt extinguishment. The remaining settlement consideration is allocated to the reacquisition of the equity component of the repurchased 2013 Notes and recognized as a reduction of stockholders’ equity.

Information about the repurchase is as follows:

	February 2016
Principal amount repurchased	$	19,639
Amount allocated to:
Extinguishment of liability component	$	18,887
Reacquisition of equity component		12,132
Total consideration paid for repurchase	$	31,019
Exchangeable senior notes repurchased	$	19,639
Extinguishment of liability component		(18,887	)
Discount on exchangeable senior notes		(716	)
Related debt issuance costs		(36	)
Gain/(loss) on repurchase	$	—

 

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Stockholders' Equity

3 Months Ended

Mar. 31, 2016

Equity [Abstract]

Stockholders' Equity

10. STOCKHOLDERS’ EQUITY

On August 28, 2015, the Company filed a $400,000 “at the market” equity program with the Securities and Exchange Commission, and entered into separate equity distribution agreements with five sales agents. During the three months ended March 31, 2016, the Company sold 831,300 shares of common stock at an average sales price of $89.66 per share, resulting in net proceeds of $73,574.

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Noncontrolling Interests

3 Months Ended

Mar. 31, 2016

Noncontrolling Interests

13. OTHER NONCONTROLLING INTERESTS

Other noncontrolling interests represent the ownership interest of third parties in two consolidated joint ventures as of March 31, 2016. One of these consolidated joint ventures owns a single operating store in California, and the other owns a store under development in Texas. The voting interests of the third-party owners range from 17.5% to 20.0%. Other noncontrolling interests are included in the stockholders’ equity section of the Company’s condensed consolidated balance sheets. The income or losses attributable to this third-party owner based on its ownership percentage are reflected in net income allocated to Operating Partnership and other noncontrolling interests in the condensed consolidated statements of operations.

On June 11, 2015, the Company purchased its joint venture partner’s remaining 1% interest in an existing joint venture for $1,267. The joint venture owned 19 properties in California, Florida, Nevada, Ohio, Pennsylvania, Tennessee, Texas and Virginia, and as a result of this purchase, these properties became wholly-owned by the Company. Prior to this acquisition, the partner’s interest was reported in other noncontrolling interests. Since the Company retained its controlling interest in the subsidiary, this transaction was accounted for as an equity transaction. The carrying amount of the noncontrolling interest was reduced to zero to reflect the purchase, and the difference between the price paid by the Company and the carrying value of the noncontrolling interest was recorded as an adjustment to equity attributable to the Company.

Common Operating Partnership [Member]

Noncontrolling Interests

12. 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 93.0% ownership interest in the Operating Partnership as of March 31, 2016. The remaining ownership interests in the Operating Partnership (including Preferred Operating Partnership units) of 7.0% 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, 2016 was $90.76 and there were 5,621,322 OP Units outstanding. Assuming that all of the OP Unit holders exercised their right to redeem all of their OP Units on March 31, 2016 and the Company elected to pay the OP Unit holders cash, the Company would have paid $510,191 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.

Preferred Operating Partnership Units [Member]

Noncontrolling Interests

11. 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.

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 June 25, 2007, the Operating Partnership loaned the holders of the Series A Units $100,000. The note receivable bears interest at 4.85%. 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. 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. 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 Series D 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 6.0%. These distributions are cumulative. The Series B Units became 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 Series D 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 became 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 also became 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 became 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.

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Segment Information

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Segment Information

15. 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, 2016		December 31, 2015
Balance Sheet
Investment in unconsolidated real estate ventures
Rental operations	$	89,224	$	103,007
Total assets
Rental operations	$	5,901,210	$	5,674,030
Tenant reinsurance		34,180		37,696
Property management, acquisition and development		356,029		359,681
	$	6,291,419	$	6,071,407

	For the Three Months Ended March 31,
	2016			2015
Statement of Operations
Total revenues
Rental operations	$	199,488		$	148,894
Tenant reinsurance		20,555			16,510
Property management, acquisition and development		9,360			7,750
		229,403			173,154
Operating expenses, including depreciation and amortization
Rental operations		101,698			75,509
Tenant reinsurance		4,311			2,928
Property management, acquisition and development		29,766			19,281
		135,775			97,718
Income (loss) from operations
Rental operations		97,790			73,385
Tenant reinsurance		16,244			13,582
Property management, acquisition and development		(20,406	)		(11,531	)
		93,628			75,436
Loss on earnout from prior acquisition
Property management, acquisition and development		(1,544	)		—
Interest expense
Rental operations		(30,565	)		(21,157	)
Property management, acquisition and development		(794	)		(274	)
		(31,359	)		(21,431	)
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes
Property management, acquisition and development		(1,233	)		(697	)
Interest income
Tenant reinsurance		3			4
Property management, acquisition and development		1,711			852
		1,714			856
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		2,830			2,650
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of partners’ interests
Property management, acquisition and development		26,923			2,857
Income tax (expense) benefit
Rental operations		(845	)		(754	)
Tenant reinsurance		(2,663	)		(1,874	)
Property management, acquisition and development		743			380
		(2,765	)		(2,248	)
Net income (loss)
Rental operations		69,210			54,124
Tenant reinsurance		13,584			11,712
Property management, acquisition and development		6,613			(7,200	)
	$	89,407		$	58,636
Depreciation and amortization expense
Rental operations	$	40,586		$	28,265
Property management, acquisition and development		2,311			2,163
	$	42,897		$	30,428
Statement of Cash Flows
Acquisition of real estate assets
Property management, acquisition and development	$	(234,820	)	$	(77,082	)
Development and redevelopment of real estate assets
Property management, acquisition and development	$	(6,543	)	$	(3,140	)

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

16. COMMITMENTS AND CONTINGENCIES

As of March 31, 2016, the Company is involved in various legal proceedings and is subject to various claims and complaints arising in the ordinary course of business. Because litigation is inherently unpredictable, the outcome of these matters cannot presently be determined with any degree of certainty. In accordance with applicable accounting guidance, management establishes an accrued liability for litigation when those matters present loss contingencies that are both probable and reasonably estimable. In such cases, there may be an exposure to loss in excess of any amounts accrued. The estimated loss, if any, is based upon currently available information and is subject to significant judgment, a variety of assumptions, and known and unknown uncertainties. Therefore, any estimate(s) of loss disclosed below represents what management believes to be an estimate of loss only for certain matters meeting these criteria and does not represent the Company’s maximum loss exposure. The Company could in the future incur judgments or enter into settlements of claims that could have a material adverse effect on its results of operations in any particular period, notwithstanding the fact that the Company is currently vigorously defending any legal proceedings against it.

The Company currently has a legal proceeding pending against it that includes causes of action alleging wrongful foreclosure, violations of various state specific self-storage statutes, and violations of various consumer fraud acts. As a result of this litigation matter, the Company recorded a liability of $4,000 during the three months ended March 31, 2016, which is included in other liabilities on the condensed consolidated balance sheet.

As of March 31, 2016, the Company was under contract to acquire 21 operating stores and nine stores to be acquired upon the completion of construction, for a total purchase price of $349,376. Of these stores, 26 are scheduled to close in 2016. The remaining stores will close upon completion of construction, expected to occur on various dates in 2017 and 2018. Additionally, the Company is under contract to acquire 10 stores with joint venture partners, for a total purchase price of $302,800. Seven of those stores are scheduled to close in 2016 while the remaining three stores are expected to close in 2017 and 2018.

Although there can be no assurance, the Company is not aware of any material environmental liability, for which it believes it will be ultimately responsible, that could have a material adverse effect on its financial condition or results of operations. However, changes in applicable environmental laws and regulations, the uses and conditions of properties in the vicinity of the Company’s properties, the activities of its tenants and other environmental conditions of which the Company is unaware with respect to its properties could result in future material environmental liabilities.

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Subsequent Events

3 Months Ended

Mar. 31, 2016

Subsequent Events [Abstract]

Subsequent Events

17. SUBSEQUENT EVENTS

Subsequent to March 31, 2016, the Company has purchased 10 stores for a total purchase price of $88,048. These stores are located in Arizona, Colorado, Hawaii, Indiana and Texas.

On April 20, 2016, the Company sold seven stores located in Ohio and Indiana that had been classified as held for sale for $18,000.

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Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Recently Issued Accounting Standards

Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“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 was originally effective for reporting periods beginning after December 15, 2016. Entities can transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. In July 2015, the FASB approved a one-year deferral of the effective date of the standard. The new standard will now become effective for annual and interim periods beginning after December 15, 2017 with early adoption on the original effective date permitted. The Company has not yet selected a transition method. The Company is currently assessing the impact of the adoption of ASU 2014-09 on the Company’s 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 variable interest entity (“VIE”), and eliminates the presumption that a general partner should consolidate a limited partnership. The Company adopted this guidance effective January 1, 2016. The adoption of this guidance did not have a significant impact on the Company’s condensed consolidated financial statements.

In April 2015, the FASB issued ASU 2015-05, “Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40) – Customers Accounting for Fees Paid in a Cloud Computing Arrangement,” which provides guidance regarding the accounting for fees paid by a customer in cloud computing arrangements. If a cloud computing arrangement includes a software license, the payment of fees should be accounted for in the same manner as the acquisition of other software licenses. If there is no software license, the fees should be accounted for as a service contract. The guidance is effective in fiscal years beginning after December 15, 2015 and early adoption is permitted. An entity can elect to adopt the amendments either (1) prospectively to all arrangements entered into or materially modified after the effective date or (2) retrospectively. The Company adopted this guidance prospectively effective January 1, 2016. The adoption of this guidance did not have a significant impact on the Company’s condensed consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which requires lessees to recognize the following for all leases (with the exception of short-term leases) at the commencement date: (1) a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and (2) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Lessor accounting is largely unchanged under ASU 2016-02. The guidance is effective for annual and interim periods beginning after December 15, 2018. The Company is currently assessing the impact of the adoption of ASU 2016-02 on the Company’s consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, “Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” ASU 2016-09 simplifies several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. This ASU is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the new guidance to determine the impact it may have on 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 FASB’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, 2016, 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, 2016, aggregated by the level in the fair value hierarchy within which those measurements fall.

	Fair Value Measurements at Reporting Date Using
Description	March 31, 2016			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	$	463		$	—	$	463		$	—
Other liabilities - Cash Flow Hedge Swap Agreements	$	(34,708	)	$	—	$	(34,708	)	$	—

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, 2016 or December 31, 2015.

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, the Company would recognize a loss on the assets held for sale. The operations of assets held for sale or sold during the period are presented as part of normal operations for all periods presented. As of March 31, 2016, the Company had eight stores classified as held for sale. The estimated fair value less selling costs of each of these assets is greater than the carrying value of the assets, and therefore no loss has been recorded.

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, 2016 and December 31, 2015 approximate fair value.

The fair values of the Company’s notes receivable from Preferred Operating Partnership unit holders and other fixed rate notes receivable 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, 2016				December 31, 2015
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	130,856	$	120,230	$	128,216	$	120,230
Fixed rate notes receivable	$	85,927	$	84,331	$	86,814	$	84,331
Fixed rate notes payable and notes payable to trusts	$	2,329,420	$	2,271,925	$	1,828,486	$	1,806,904
Exchangeable senior notes	$	767,992	$	640,725	$	770,523	$	660,364

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, 2016 and 2015, options to purchase approximately 67,812 and 19,762 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 $86.91.

	For the Three Months Ended March 31,
	2016				2015
	Number of Units		Equivalent Shares (if converted)		Number of Units		Equivalent Shares (if converted)
Series B Units		1,676,087		482,133		1,676,087		638,850
Series C Units		704,016		341,032		704,016		451,884
Series D Units		548,390		157,747		548,390		209,022
		2,928,493		980,912		2,928,493		1,299,756

The Operating Partnership had $65,725 of its 2.375% Exchangeable Senior Notes due 2033 (the “2013 Notes”) issued and outstanding as of March 31, 2016. The 2013 Notes could potentially have a dilutive impact on the Company’s earnings per share calculations. The 2013 Notes are exchangeable by holders into shares of the Company’s common stock under certain circumstances per the terms of the indenture governing the 2013 Notes. The exchange price of the 2013 Notes was $54.87 per share as of March 31, 2016, 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 2013 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.

The Operating Partnership had $575,000 of its 3.125% Exchangeable Senior Notes due 2035 (the “2015 Notes”) issued and outstanding as of March 31, 2016. The 2015 Notes could potentially have a dilutive impact on the Company’s earnings per share calculations. The 2015 Notes are exchangeable by holders into shares of the Company’s common stock under certain circumstances per the terms of the indenture governing the 2015 Notes. The exchange price of the 2015 Notes was $95.40 per share as of March 31, 2016, 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 2015 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.

Although the Company has retained the right to satisfy the exchange obligation in excess of the accreted principal amount of the 2013 Notes and 2015 Notes in cash and/or common stock, Accounting Standards Codification (“ASC”) 260, “Earnings per Share,” requires an assumption that shares would be used to pay such exchange obligation, 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, 2016 and 2015, 441,598 and 682,502 shares, respectively, related to the 2013 Notes were included in the computation for diluted earnings per share. For the three months ended March 31, 2016, no shares related to the 2015 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 three months ended March 31, 2015, no shares related to the 2015 Notes were included in the computation for diluted earnings per share as the 2015 Notes were not outstanding during that time 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, 2016 of $41,902 by the closing price of the Company’s common stock as of March 31, 2016 of $93.46 per share. Assuming full exchange for common shares as of March 31, 2016, 448,342 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, 2016 of $29,639 by the closing price of the Company’s common stock as of March 31, 2016 of $93.46 per share. Assuming full exchange for common shares as of March 31, 2016, 317,130 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, 2016 of $13,710 by the closing price of the Company’s common stock as of March 31, 2016 of $93.46 per share. Assuming full exchange for common shares as of March 31, 2016, 146,694 shares would have been issued to the holders of the Series D Units.

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 2013 Notes and 2015 Notes separately. The equity components are included in paid-in capital in stockholders’ equity in the condensed consolidated balance sheets, and the value of the equity components are treated as original issue discount for purposes of accounting for the debt components. The discounts are being amortized as interest expense over the remaining period of the debt through its first redemption date: July 1, 2018 for the 2013 Notes, and October 1, 2020 for the 2015 Notes. The effective interest rate on the liability components of both the 2013 Notes and the 2015 Notes is 4.0%, which approximates the market rate of interest of similar debt without exchange features (i.e. nonconvertible debt) at the time of issuance.

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Fair Value Disclosures (Tables)

3 Months Ended

Mar. 31, 2016

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, 2016, aggregated by the level in the fair value hierarchy within which those measurements fall.

	Fair Value Measurements at Reporting Date Using
Description	March 31, 2016			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	$	463		$	—	$	463		$	—
Other liabilities - Cash Flow Hedge Swap Agreements	$	(34,708	)	$	—	$	(34,708	)	$	—

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, 2016				December 31, 2015
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	130,856	$	120,230	$	128,216	$	120,230
Fixed rate notes receivable	$	85,927	$	84,331	$	86,814	$	84,331
Fixed rate notes payable and notes payable to trusts	$	2,329,420	$	2,271,925	$	1,828,486	$	1,806,904
Exchangeable senior notes	$	767,992	$	640,725	$	770,523	$	660,364

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Earnings Per Common Share (Tables)

3 Months Ended

Mar. 31, 2016

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 $86.91.

	For the Three Months Ended March 31,
	2016				2015
	Number of Units		Equivalent Shares (if converted)		Number of Units		Equivalent Shares (if converted)
Series B Units		1,676,087		482,133		1,676,087		638,850
Series C Units		704,016		341,032		704,016		451,884
Series D Units		548,390		157,747		548,390		209,022
		2,928,493		980,912		2,928,493		1,299,756

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,
	2016			2015
Net income attributable to common stockholders	$	82,592		$	53,742
Earnings and dividends allocated to participating securities		(165	)		(119	)
Earnings for basic computations		82,427			53,623
Earnings and dividends allocated to participating securities		—			119
Income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units) and Operating Partnership		5,474			3,635
Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units)		(1,271	)		(1,274	)
Net income for diluted computations	$	86,630		$	56,103
Weighted average common shares outstanding:
Average number of common shares outstanding - basic		124,754,174			116,117,615
Series A Units		875,480			875,480
OP Units		5,621,470			4,365,879
Unvested restricted stock awards included for treasury stock method		—			282,903
Shares related to exchangeable senior notes and dilutive stock options		704,970			953,841
Average number of common shares outstanding - diluted		131,956,094			122,595,718
Earnings per common share
Basic	$	0.66		$	0.46
Diluted	$	0.66		$	0.46

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Store Acquisitions (Tables)

3 Months Ended

Mar. 31, 2016

Business Combinations [Abstract]

Schedule of Operating Properties Acquired

The following table shows the Company’s acquisitions of operating stores for the three months ended March 31, 2016, and does not include purchases of raw land or improvements made to existing assets:

			Consideration Paid							Fair Value
Property Location	Number of Stores	Date of Acquisition	Total		Cash Paid		Net Liabilities/ (Assets) Assumed			Real estate assets
New Mexico	1	3/29/2016	$	10,958	$	10,928	$	30		$	10,958
New Mexico	1	3/29/2016		17,940		17,905		35			17,940
Georgia	3	3/29/2016		25,087		25,069		18			25,087
Texas	1	3/21/2016		9,994		9,969		25			9,994
Illinois	1	2/25/2016		16,721		16,738		(17	)		16,721
Massachusetts	1	2/16/2016		16,169		16,174		(5	)		16,169
Florida, Maryland, Nevada, New York, Tennessee (1)	6	2/2/2016		53,898		53,940		(42	)		98,082
Texas	3	1/14/2016		22,625		22,523		102			22,625
Florida	1	1/12/2016		9,001		8,980		21			9,001
Texas	3	1/7/2016		27,537		27,435		102			27,537
New Mexico	2	1/7/2016		15,607		15,495		112			15,607
2016 Totals	23		$	225,537	$	225,156	$	381		$	269,721

(1) - On February 2, 2016, the Company acquired six stores from its VRS Self Storage LLC joint venture (“VRS”) in a step acquisition. The Company owns 45.04% of VRS, with the other 54.96% owned by affiliates of Prudential Real Estate (“Prudential”). VRS created a new subsidiary, Extra Space Properties 122 LLC (“ESP 122”) and transferred six stores into ESP 122. VRS then distributed ESP 122 to the Company and Prudential on a pro rata basis. This distribution was accounted for as a spinoff, and was therefore recorded at the net carrying amount of the properties of $17,261. Immediately after the distribution, the Company acquired Prudential’s 54.96% interest in ESP 122 for $53,940, resulting in 100% ownership of ESP 122 and the related six stores. Based on the purchase price of Prudential’s share of ESP 122, the Company determined that the fair value of its investment in ESP 122 immediately prior to the acquisition of Prudential’s share was $44,184, and the Company recorded a gain of $26,923 as a result of re-measuring to fair value its existing equity interest in ESP 122. This gain is included in equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partners’ interests on the Company’s condensed consolidated statements of operations.

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Variable Interests (Tables)

3 Months Ended

Mar. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Assets and Liabilities and Maximum Exposure to Loss Related to Trusts

Following is a tabular comparison of the assets and 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, 2016:

	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		—
Unamortized debt issuance costs		(2,365	)
	$	117,225		$	3,590	$	116,000	$	—

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Derivatives (Tables)

3 Months Ended

Mar. 31, 2016

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, 2016			December 31, 2015
Derivatives designated as hedging instruments:	Fair Value
Other assets	$	463		$	4,996
Other liabilities	$	(34,708	)	$	(6,991	)

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		2016			2015
Swap Agreements	Interest expense	$	(4,454	)	$	(2,297	)

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

Gain (loss) recognized in OCI For the Three Months Ended March 31,						Location of amounts reclassified from OCI into income	Gain (loss) reclassifed from OCI For the Three Months Ended March 31,
Type	2016			2015				2016			2015
Swap Agreements	$	(34,960	)	$	(8,875	)	Interest expense	$	(4,454	)	$	(2,297	)

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Exchangeable Senior Notes (Tables)

3 Months Ended

Mar. 31, 2016

Text Block [Abstract]

Schedule of Information about Total Carrying Amounts of Equity Components, Principal Amounts of Liability Components, Unamortized Discounts and Net Carrying Amounts for Notes

Information about the Company’s 2013 Notes and 2015 Notes, including the total carrying amounts of the equity components, the principal amounts of the liability components, the unamortized discounts and the net carrying amounts was as follows for the periods indicated:

	March 31, 2016			December 31, 2015
Carrying amount of equity component - 2013 Notes	$	—		$	—
Carrying amount of equity component - 2015 Notes		22,597			22,597
Carrying amount of equity components	$	22,597		$	22,597
Principal amount of liability component 2013 Notes	$	65,725		$	85,364
Principal amount of liability component 2015 Notes		575,000			575,000
Unamortized discount - equity component - 2013 Notes		(1,827	)		(2,605	)
Unamortized discount - equity component - 2015 Notes		(20,533	)		(21,565	)
Unamortized cash discount - 2013 Notes		(438	)		(633	)
Unamortized debt issuance costs		(11,040	)		(11,698	)
Net carrying amount of liability components	$	606,887		$	623,863

Summary of Amount of Interest Cost Recognized Relating to Contractual Interest Rates and Amortization of Discounts on Liability Components of Notes

The amount of interest cost recognized relating to the contractual interest rates and the amortization of the discounts on the liability components of the Notes were as follows for the periods indicated:

	For the Three Months Ended March 31,
	2016		2015
Contractual interest	$	4,882	$	1,484
Amortization of discount		1,233		697
Total interest expense recognized	$	6,115	$	2,181

Summary of Repurchase of Debt

Information about the repurchase is as follows:

	February 2016
Principal amount repurchased	$	19,639
Amount allocated to:
Extinguishment of liability component	$	18,887
Reacquisition of equity component		12,132
Total consideration paid for repurchase	$	31,019
Exchangeable senior notes repurchased	$	19,639
Extinguishment of liability component		(18,887	)
Discount on exchangeable senior notes		(716	)
Related debt issuance costs		(36	)
Gain/(loss) on repurchase	$	—

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Segment Information (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Schedule of Financial Information of Business Segments

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

	March 31, 2016		December 31, 2015
Balance Sheet
Investment in unconsolidated real estate ventures
Rental operations	$	89,224	$	103,007
Total assets
Rental operations	$	5,901,210	$	5,674,030
Tenant reinsurance		34,180		37,696
Property management, acquisition and development		356,029		359,681
	$	6,291,419	$	6,071,407

	For the Three Months Ended March 31,
	2016			2015
Statement of Operations
Total revenues
Rental operations	$	199,488		$	148,894
Tenant reinsurance		20,555			16,510
Property management, acquisition and development		9,360			7,750
		229,403			173,154
Operating expenses, including depreciation and amortization
Rental operations		101,698			75,509
Tenant reinsurance		4,311			2,928
Property management, acquisition and development		29,766			19,281
		135,775			97,718
Income (loss) from operations
Rental operations		97,790			73,385
Tenant reinsurance		16,244			13,582
Property management, acquisition and development		(20,406	)		(11,531	)
		93,628			75,436
Loss on earnout from prior acquisition
Property management, acquisition and development		(1,544	)		—
Interest expense
Rental operations		(30,565	)		(21,157	)
Property management, acquisition and development		(794	)		(274	)
		(31,359	)		(21,431	)
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes
Property management, acquisition and development		(1,233	)		(697	)
Interest income
Tenant reinsurance		3			4
Property management, acquisition and development		1,711			852
		1,714			856
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		2,830			2,650
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of partners’ interests
Property management, acquisition and development		26,923			2,857
Income tax (expense) benefit
Rental operations		(845	)		(754	)
Tenant reinsurance		(2,663	)		(1,874	)
Property management, acquisition and development		743			380
		(2,765	)		(2,248	)
Net income (loss)
Rental operations		69,210			54,124
Tenant reinsurance		13,584			11,712
Property management, acquisition and development		6,613			(7,200	)
	$	89,407		$	58,636
Depreciation and amortization expense
Rental operations	$	40,586		$	28,265
Property management, acquisition and development		2,311			2,163
	$	42,897		$	30,428
Statement of Cash Flows
Acquisition of real estate assets
Property management, acquisition and development	$	(234,820	)	$	(77,082	)
Development and redevelopment of real estate assets
Property management, acquisition and development	$	(6,543	)	$	(3,140	)

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Organization - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016 Store Segments
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of operating storage facilities in which the entity has equity interests (in stores)	1,018
Number of stores owned by franchisees and third parties	353
Number of operating stores owned and/or managed	1,371
Number of states in which operating storage facilities are located	37
Number of reportable segments | 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%

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Fair Value Disclosures - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - Recurring Basis [Member] $ in Thousands	Mar. 31, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets - Cash Flow Hedge Swap Agreements	$ 463
Other liabilities - Cash Flow Hedge Swap Agreements	(34,708)
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	463
Other liabilities - Cash Flow Hedge Swap Agreements	$ (34,708)

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Fair Value Disclosures - Additional Information (Detail)	Mar. 31, 2016 Store
Debt Instrument Fair Value Carrying Value [Abstract]
Number of stores classified as held for sale	8

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Fair Value Disclosures - Schedule of Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
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	2,842,076	2,758,567
Exchangeable senior notes	606,887	623,863
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 receivable	84,331	84,331
Fixed rate notes payable and notes payable to trusts	2,271,925	1,806,904
Exchangeable senior notes	640,725	660,364
Fair Value [Member]
Fair Value of Financial Instruments [Line Items]
Notes receivable from Preferred Operating Partnership unit holders	130,856	128,216
Fixed rate notes receivable	85,927	86,814
Fixed rate notes payable and notes payable to trusts	2,329,420	1,828,486
Exchangeable senior notes	$ 767,992	$ 770,523

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Earnings Per Common Share - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Feb. 29, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 21, 2013
Earnings Per Common Share [Line Items]
Average share price	$ 86.91
Principal amount of notes outstanding	$ 606,887,000			$ 623,863,000
Average closing price of common stock	$ 93.46
Anti-dilutive securities excluded from computation of earnings per common share	875,480	875,480
Operating Partnership [Member] | 2.375% Exchangeable Senior Notes due 2033 (the 2013 Notes) [Member]
Earnings Per Common Share [Line Items]
Principal amount of notes outstanding	$ 65,725,000		$ 19,639,000	85,364,000
Interest rate	2.375%					2.375%
Exchange price	$ 54.87
Principal amount of notes issued						$ 250,000,000
Shares related to the Notes included in the computation for diluted earnings per share	441,598	682,502
Operating Partnership [Member] | Exchangeable Senior Notes 3.125% due 2035 (the 2015 Notes) [Member]
Earnings Per Common Share [Line Items]
Principal amount of notes outstanding	$ 575,000,000			$ 575,000,000
Interest rate	3.125%				3.125%
Exchange price	$ 95.40
Principal amount of notes issued	$ 575,000,000				$ 575,000,000
Shares related to the Notes included in the computation for diluted earnings per share	0	0
Series A Units [Member]
Earnings Per Common Share [Line Items]
Exchangeable preferred operating partnership units settled in cash, minimum	$ 115,000,000
Series B Units [Member]
Earnings Per Common Share [Line Items]
Units outstanding	$ 41,902,000
Anti-dilutive securities excluded from computation of earnings per common share	448,342
Series C Units [Member]
Earnings Per Common Share [Line Items]
Units outstanding	$ 29,639,000
Anti-dilutive securities excluded from computation of earnings per common share	317,130
Series D Units [Member]
Earnings Per Common Share [Line Items]
Units outstanding	$ 13,710,000
Anti-dilutive securities excluded from computation of earnings per common share	146,694
Stock Options [Member]
Earnings Per Common Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per common share	67,812	19,762

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Earnings Per Common Share - Schedule of Antidilutive Shares Excluded from Computation of Earnings Per Share (Detail) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of Units	2,928,493	2,928,493
Equivalent Shares (if converted)	980,912	1,299,756
Series B Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of Units	1,676,087	1,676,087
Equivalent Shares (if converted)	482,133	638,850
Series C Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of Units	704,016	704,016
Equivalent Shares (if converted)	341,032	451,884
Series D Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of Units	548,390	548,390
Equivalent Shares (if converted)	157,747	209,022

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Earnings Per Common Share - Schedule of Computation of Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net income attributable to common stockholders	$ 82,592	$ 53,742
Earnings and dividends allocated to participating securities	(165)	(119)
Earnings for basic computations	82,427	53,623
Earnings and dividends allocated to participating securities		119
Income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units) and Operating Partnership	5,474	3,635
Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units)	(1,271)	(1,274)
Net income for diluted computations	$ 86,630	$ 56,103
Weighted average common shares outstanding:
Average number of common shares outstanding - basic	124,754,174	116,117,615
Series A Units	875,480	875,480
OP Units	5,621,470	4,365,879
Unvested restricted stock awards included for treasury stock method		282,903
Shares related to exchangeable senior notes and dilutive stock options	704,970	953,841
Average number of common shares outstanding - diluted	131,956,094	122,595,718
Earnings per common share
Basic	$ 0.66	$ 0.46
Diluted	$ 0.66	$ 0.46

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Store Acquisitions - Schedule of Operating Properties Acquired (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) Property
Property Acquisitions [Line Items]
Number of Stores | Property	23
Total Consideration Paid	$ 225,537
Cash Consideration Paid	225,156
Net Liabilities/ (Assets) Assumed	381
Fair Value Real estate assets	$ 269,721
New Mexico 1 Property Acquired 3/29/2016 [Member]
Property Acquisitions [Line Items]
Number of Stores | Property	1
Total Consideration Paid	$ 10,958
Cash Consideration Paid	10,928
Net Liabilities/ (Assets) Assumed	30
Fair Value Real estate assets	$ 10,958
New Mexico 1 Property Acquired 3/29/2016 [Member]
Property Acquisitions [Line Items]
Number of Stores | Property	1
Total Consideration Paid	$ 17,940
Cash Consideration Paid	17,905
Net Liabilities/ (Assets) Assumed	35
Fair Value Real estate assets	$ 17,940
Georgia 3 Property Acquired 3/29/2016 [Member]
Property Acquisitions [Line Items]
Number of Stores | Property	3
Total Consideration Paid	$ 25,087
Cash Consideration Paid	25,069
Net Liabilities/ (Assets) Assumed	18
Fair Value Real estate assets	$ 25,087
Texas 1 Property Acquired 3/21/2016 [Member]
Property Acquisitions [Line Items]
Number of Stores | Property	1
Total Consideration Paid	$ 9,994
Cash Consideration Paid	9,969
Net Liabilities/ (Assets) Assumed	25
Fair Value Real estate assets	$ 9,994
Illinois 1 Property Acquired 2/25/2016 [Member]
Property Acquisitions [Line Items]
Number of Stores | Property	1
Total Consideration Paid	$ 16,721
Cash Consideration Paid	16,738
Net Liabilities/ (Assets) Assumed	(17)
Fair Value Real estate assets	$ 16,721
Massachusetts 1 Property Acquired 2/16/2016 [Member]
Property Acquisitions [Line Items]
Number of Stores | Property	1
Total Consideration Paid	$ 16,169
Cash Consideration Paid	16,174
Net Liabilities/ (Assets) Assumed	(5)
Fair Value Real estate assets	$ 16,169
Florida Maryland Nevada New York Tennessee 6 Property Acquired 2/2/2016 [Member]
Property Acquisitions [Line Items]
Number of Stores | Property	6
Total Consideration Paid	$ 53,898
Cash Consideration Paid	53,940
Net Liabilities/ (Assets) Assumed	(42)
Fair Value Real estate assets	$ 98,082
Texas 3 Property Acquired 1/14/2016 [Member]
Property Acquisitions [Line Items]
Number of Stores | Property	3
Total Consideration Paid	$ 22,625
Cash Consideration Paid	22,523
Net Liabilities/ (Assets) Assumed	102
Fair Value Real estate assets	$ 22,625
Florida 1 Property Acquired 1/12/2016 [Member]
Property Acquisitions [Line Items]
Number of Stores | Property	1
Total Consideration Paid	$ 9,001
Cash Consideration Paid	8,980
Net Liabilities/ (Assets) Assumed	21
Fair Value Real estate assets	$ 9,001
Texas 3 Property Acquired 1/7/2016 [Member]
Property Acquisitions [Line Items]
Number of Stores | Property	3
Total Consideration Paid	$ 27,537
Cash Consideration Paid	27,435
Net Liabilities/ (Assets) Assumed	102
Fair Value Real estate assets	$ 27,537
New Mexico 2 Property Acquired 1/7/2016 [Member]
Property Acquisitions [Line Items]
Number of Stores | Property	2
Total Consideration Paid	$ 15,607
Cash Consideration Paid	15,495
Net Liabilities/ (Assets) Assumed	112
Fair Value Real estate assets	$ 15,607

XML

Store Acquisitions - Schedule of Operating Properties Acquired (Parenthetical) (Detail) $ in Thousands	Feb. 02, 2016 USD ($) Store
VRS Self Storage LLC Joint Venture [Member]
Property Acquisitions [Line Items]
Number of stores acquired | Store	6
Ownership percentage in joint venture	45.04%
Extra Space Properties 122 LLC [Member]
Property Acquisitions [Line Items]
Number of stores acquired | Store	6
Number of stores transferred to new wholly-owned subsidiary | Store	6
Net carrying amount of properties distributed for spinoff	$ 17,261
Ownership interest percentage, after acquisition	100.00%
Business acquisition, cost of acquired entity, purchase price	$ 44,184
Equity interest fair value remeasurement gain	$ 26,923
Prudential Real Estate and Affiliates [Member] | VRS Self Storage LLC Joint Venture [Member]
Property Acquisitions [Line Items]
Business acquisition, percentage of voting interests acquired	54.96%
Prudential Real Estate and Affiliates [Member] | Extra Space Properties 122 LLC [Member]
Property Acquisitions [Line Items]
Business acquisition, percentage of voting interests acquired	54.96%
Total purchase price	$ 53,940

XML

Store Acquisitions - Additional Information (Detail) - New Jersey And Virginia, 5 Stores Acquired in 2014 [Member] $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($)	Dec. 31, 2014 Store
Property Acquisition And Dispositions [Line Items]
Number of operating stores acquired | Store		5
Increase in payments due to sellers resulting from higher rental income of properties | $	$ 1,544

XML

Investments in Unconsolidated Real Estate Ventures - Additional Information (Detail) - Baychester Investments LLC [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) Store
Schedule of Equity Method Investments [Line Items]
Number of stores | Store	1
Amount paid for interest | $	$ 4,794
Equity method ownership percentage	44.40%

XML

Variable Interests - Additional Information (Detail)	Mar. 31, 2016 Item JointVenture
Variable Interests And Equity Method Investments Disclosure [Abstract]
Number of wholly-owned unconsolidated subsidiaries | Item	3
Number of interests in consolidated VIE joint ventures | JointVenture	0

XML

Variable Interests - Schedule of Assets and Liabilities and Maximum Exposure to Loss Related to Trusts (Detail) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Notes payable to trusts	$ 117,225,000	$ 117,191,000
Operating Partnership [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Notes payable to trusts	117,225,000
Investment Balance	3,590,000
Maximum exposure to loss	116,000,000
Difference	0
Operating Partnership [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Trust I [Member]
Variable Interest Entity [Line Items]
Notes payable to trusts	36,083,000
Investment Balance	1,083,000
Maximum exposure to loss	35,000,000
Difference	0
Operating Partnership [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Trust II [Member]
Variable Interest Entity [Line Items]
Notes payable to trusts	42,269,000
Investment Balance	1,269,000
Maximum exposure to loss	41,000,000
Difference	0
Operating Partnership [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Trust III [Member]
Variable Interest Entity [Line Items]
Notes payable to trusts	41,238,000
Investment Balance	1,238,000
Maximum exposure to loss	40,000,000
Difference	0
Operating Partnership [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Gross [Member]
Variable Interest Entity [Line Items]
Notes payable to trusts	119,590,000
Investment Balance	3,590,000
Maximum exposure to loss	116,000,000
Difference	0
Operating Partnership [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Unamortized Debt Issuance Expense [Member]
Variable Interest Entity [Line Items]
Notes payable to trusts	(2,365,000)
Difference	$ 0

XML

Derivatives - Additional Information (Detail)	Mar. 31, 2016 USD ($) Item
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Estimated amount of unrealized gains or losses expected to be reclassified as interest expense in next fiscal year	$ 16,403,000
Number of derivative financial instruments | Item	29
Combined notional amount	$ 1,850,111,000
Credit risk derivative, fair value of derivatives in a net liability position	34,708,000
Estimated termination value on settlement	$ 37,240,000

XML

Derivatives - Schedule of Balance Sheet Classification and Fair Value of Entity's Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Other Assets [Member]
Derivative [Line Items]
Other assets - Asset (Liability) Derivatives	$ 463	$ 4,996
Other Liabilities [Member]
Derivative [Line Items]
Other liabilities - Asset (Liability) Derivatives	$ (34,708)	$ (6,991)

XML

Derivatives - Interest Payments Recognized as Increase or Decrease in Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest Rate Swap [Member]
Derivative [Line Items]
Swap agreements increase (decrease) in interest expenses due to interest payments	$ (4,454)	$ (2,297)

XML

Derivatives - Schedule of Information Relating to Gain (Loss) Recognized on Swap Agreements (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Swap agreements gain (loss) recognized in OCI	$ (34,960)	$ (8,875)
Swap agreements gain (loss) reclassified from OCI - Interest expense	$ (4,454)	$ (2,297)

XML

Exchangeable Senior Notes - Additional Information (Detail) shares in Thousands			1 Months Ended		3 Months Ended
	Feb. 29, 2016 USD ($)	Jun. 21, 2013 USD ($)	Feb. 29, 2016 USD ($) shares	Sep. 30, 2015 USD ($)	Mar. 31, 2016 USD ($) d	Dec. 31, 2015 USD ($)
Par Value [Member]
Debt Instrument [Line Items]
Shares issued for value of notes in excess of principal amount | shares			130,909
Value of notes in excess of principal amount			$ 11,380,000
2.375% Exchangeable Senior Notes due 2033 (the 2013 Notes) [Member]
Debt Instrument [Line Items]
Notes exchange, threshold percentage					130.00%
Notes exchange, threshold trading days | d					20
Notes exchange, threshold consecutive trading days					30 days
Effective interest rate on the liability component					4.00%
2.375% Exchangeable Senior Notes due 2033 (the 2013 Notes) [Member] | Operating Partnership [Member]
Debt Instrument [Line Items]
Principal amount of notes issued		$ 250,000,000
Interest rate		2.375%			2.375%
Issuance cost	$ 36,000	$ 1,672,000
Conversion ratio, number of shares per $1,000 principal amount, numerator					18.22
Principal amount used for debt instrument conversion ratio					$ 1,000
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%
Discount rate (as a percent)		1.50%
Amortization period		5 years
Unamortized cash discount	716,000	$ 3,750,000	716,000		$ 438,000	$ 633,000
Principal amount repurchased	$ 19,639,000		$ 19,639,000
Exchangeable Senior Notes 3.125% due 2035 (the 2015 Notes) [Member]
Debt Instrument [Line Items]
Effective interest rate on the liability component					4.00%
Exchangeable Senior Notes 3.125% due 2035 (the 2015 Notes) [Member] | Operating Partnership [Member]
Debt Instrument [Line Items]
Principal amount of notes issued				$ 575,000,000	$ 575,000,000
Interest rate				3.125%	3.125%
Issuance cost				$ 11,992,000
Underwriting fee percentage				2.00%
Amortization period				5 years
Conversion ratio, number of shares per $1,000 principal amount, numerator					10.48
Principal amount used for debt instrument conversion ratio					$ 1,000
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 due 2033 (the 2013 Notes) [Member] | Operating Partnership [Member]
Debt Instrument [Line Items]
Number of days of written notice to holders of notes required for redemption		30 days
Minimum [Member] | Exchangeable Senior Notes 3.125% due 2035 (the 2015 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 due 2033 (the 2013 Notes) [Member] | Operating Partnership [Member]
Debt Instrument [Line Items]
Number of days of written notice to holders of notes required for redemption		60 days
Maximum [Member] | Exchangeable Senior Notes 3.125% due 2035 (the 2015 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

Exchangeable Senior Notes - Schedule of Information about Total Carrying Amounts of Equity Components, Principal Amounts of Liability Components, Unamortized Discounts and Net Carrying Amounts for Notes (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Feb. 29, 2016	Dec. 31, 2015	Jun. 21, 2013
Debt Instrument [Line Items]
Principal amount of liability components	$ 606,887		$ 623,863
Operating Partnership [Member]
Debt Instrument [Line Items]
Carrying amount of equity components	22,597		22,597
Net carrying amount of liability components	606,887		623,863
Operating Partnership [Member] | 2.375% Exchangeable Senior Notes due 2033 (the 2013 Notes) [Member]
Debt Instrument [Line Items]
Principal amount of liability components	65,725	$ 19,639	85,364
Unamortized discount - equity components	(1,827)		(2,605)
Unamortized cash discount	(438)	$ (716)	(633)	$ (3,750)
Operating Partnership [Member] | Exchangeable Senior Notes 3.125% due 2035 (the 2015 Notes) [Member]
Debt Instrument [Line Items]
Carrying amount of equity components	22,597		22,597
Principal amount of liability components	575,000		575,000
Unamortized discount - equity components	(20,533)		(21,565)
Operating Partnership [Member] | Exchangeable Senior Notes [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (11,040)		$ (11,698)

XML

Exchangeable Senior Notes - Summary of Amount of Interest Cost Recognized Relating to Contractual Interest Rates and Amortization of Discounts on Liability Components of Notes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Debt Disclosure [Abstract]
Contractual interest	$ 4,882	$ 1,484
Amortization of discount	1,233	697
Total interest expense recognized	$ 6,115	$ 2,181

XML

Exchangeable Senior Notes - Summary of Repurchase of Debt (Detail) - USD ($) $ in Thousands	Feb. 29, 2016	Jun. 21, 2013	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Exchangeable senior notes repurchased			$ 606,887	$ 623,863
Operating Partnership [Member] | 2.375% Exchangeable Senior Notes due 2033 (the 2013 Notes) [Member]
Debt Instrument [Line Items]
Principal amount repurchased	$ 19,639
Extinguishment of liability component	18,887
Reacquisition of equity component	12,132
Total consideration paid for repurchase	31,019
Exchangeable senior notes repurchased	19,639		65,725	85,364
Extinguishment of liability component	(18,887)
Discount on exchangeable senior notes	(716)	$ (3,750)	$ (438)	$ (633)
Related debt issuance costs	(36)	$ (1,672)
Gain/(loss) on repurchase	$ 0

XML

Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Thousands		3 Months Ended
	Aug. 28, 2015 USD ($) SalesAgents	Mar. 31, 2016 USD ($) $ / shares shares
Changes In Equity And Comprehensive Income Line Items [Line Items]
Proceeds from issuance of common stock		$ 73,574
At the Market Equity Distribution Agreement [Member]
Changes In Equity And Comprehensive Income Line Items [Line Items]
Number of sales agents | SalesAgents	5
Aggregate offering price of common share	$ 400,000
Common stock issued and sold | shares		831,300
Average price per share | $ / shares		$ 89.66
Proceeds from issuance of common stock		$ 73,574

XML

Noncontrolling Interest Represented by Preferred Operating Partnership Units - Series A Participating Redeemable Preferred Units - Additional Information (Detail) $ in Thousands				3 Months Ended
	Oct. 03, 2014 USD ($) shares	Jun. 25, 2007 USD ($) shares	Jun. 15, 2007 Property shares	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
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 | Property			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 (in units) | shares			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) | shares		114,500
A units redeemed | shares	114,500
A units redeemed ,value | $	$ 4,794
Additional units redeemed | shares	0
Common shares issued in Preferred Unit redemption | shares	280,331

XML

Noncontrolling Interest Represented by Preferred Operating Partnership Units - Series B Redeemable Preferred Units - Additional Information (Detail) - Series B Redeemable Preferred Units [Member] $ / shares in Units, $ in Thousands				3 Months Ended
	Apr. 03, 2014 USD ($) Store shares	Sep. 26, 2013 USD ($) Store shares	Aug. 29, 2013 Store	Mar. 31, 2016 USD ($) $ / shares
Series B Units [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Liquidation value (in dollars per share) | $ / shares				$ 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 units issued as part of acquisition (in units) | shares	333,360
Preferred units issued as part of 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 | Store	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 | Store		1	19
Number of stores acquired as part of portfolio acquisition | Store			20
Debt assumed		$ 98,960
Number of common units issued as part of acquisition | shares		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 units issued as part of acquisition (in units) | shares		1,342,727
Preferred units issued as part of acquisition		$ 33,568

XML

Noncontrolling Interest Represented by Preferred Operating Partnership Units - Series C Convertible Redeemable Preferred Units - Additional Information (Detail) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended	6 Months Ended
	Nov. 19, 2013 Store	Dec. 31, 2014 USD ($)	Mar. 31, 2016 USD ($) shares $ / shares	May. 31, 2014 USD ($) Store shares	Dec. 31, 2015 USD ($)
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) | $ / shares			$ 42.10
Fixed liquidation value			$ 29,639
Quarterly distribution per preferred OP unit payable above quarterly distribution for common OP Unit | $ / shares			$ 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 | shares			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 stores acquired | Store	12
Ownership interests 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 | Store				1
Number of stores in which ownership interest was held prior to acquisition of remaining properties | Store				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 | Store				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 units) | shares				704,016
Preferred units issued as part of acquisition				$ 30,960

XML

Noncontrolling Interest Represented by Preferred Operating Partnership Units - Series D Redeemable Preferred Units - Additional Information (Detail) - Series D Redeemable Preferred Units [Member] - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Dec. 31, 2014	Mar. 31, 2016
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 units)	548,390
Preferred units issued as part of acquisition	$ 13,710

XML

Noncontrolling Interest in Operating Partnership - Additional Information (Detail) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) $ / shares shares
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 | $ / shares	$ 90.76
Consideration to be paid on redemption of common OP units | $	$ 510,191
Operating Partnership [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Ownership interest held by entity (as a percent)	93.00%
Noncontrolling interest in operating partnership (as a percent)	7.00%
OP units outstanding | shares	5,621,322

XML

Other Noncontrolling Interests - Additional Information (Detail)	Jun. 11, 2015 USD ($) Property	Mar. 31, 2016 JointVenture
Noncontrolling Interest in Operating Partnership [Line Items]
Purchase of capital interest by entity in a joint venture partner of a consolidated property	1.00%
Cash paid for acquiring interest in a joint venture partner of a consolidated property	$ 1,267,000
Number of operating stores owned by consolidated joint venture | Property	19
Carrying amount of noncontrolling interest	$ 0
Other [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Number of consolidated joint ventures | JointVenture		2
Other [Member] | Minimum [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Voting interests of third-party owners		17.50%
Other [Member] | Maximum [Member]
Noncontrolling Interest in Operating Partnership [Line Items]
Voting interests of third-party owners		20.00%

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) $ in Thousands	Feb. 02, 2016 USD ($) Store	Mar. 31, 2015 USD ($) Store
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
VRS Self Storage LLC Joint Venture [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Number of stores acquired | Store	6
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 [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Number of operating stores sold by consolidated joint venture | Store		1
Proceeds from sale of property		$ 90,000
VRS Self Storage LLC Joint Venture [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Equity interest fair value remeasurement non-cash gain	$ 26,923

XML

Segment Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016 Segments
Segment Reporting [Abstract]
Number of reportable segments	3

XML

Segment Information - Schedule of Financial Information of Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Investment in unconsolidated real estate ventures	$ 89,224		$ 103,007
Total assets	6,291,419		6,071,407
Total revenues	229,403	$ 173,154
Operating expenses, including depreciation and amortization	135,775	97,718
Income (loss) from operations	93,628	75,436
Loss on earnout from prior acquisition	(1,544)
Interest income	1,714	856
Interest expense	(31,359)	(21,431)
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes	(1,233)	(697)
Interest income on note receivable from Preferred Operating Partnership unit holder	1,213	1,213
Equity in earnings of unconsolidated real estate ventures	2,830	2,650
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of partners' interests	26,923	2,857
Income tax (expense) benefit	2,765	2,248
Net income (loss)	89,407	58,636
Depreciation and amortization expense	42,897	30,428
Acquisition of real estate assets	(234,820)	(77,082)
Development and redevelopment of real estate assets	(6,543)	(3,140)
Rental Operations [Member]
Segment Reporting Information [Line Items]
Investment in unconsolidated real estate ventures	89,224		103,007
Total assets	5,901,210		5,674,030
Total revenues	199,488	148,894
Operating expenses, including depreciation and amortization	101,698	75,509
Income (loss) from operations	97,790	73,385
Interest expense	(30,565)	(21,157)
Equity in earnings of unconsolidated real estate ventures	2,830	2,650
Income tax (expense) benefit	845	754
Net income (loss)	69,210	54,124
Depreciation and amortization expense	40,586	28,265
Tenant Reinsurance [Member]
Segment Reporting Information [Line Items]
Total assets	34,180		37,696
Total revenues	20,555	16,510
Operating expenses, including depreciation and amortization	4,311	2,928
Income (loss) from operations	16,244	13,582
Interest income	3	4
Income tax (expense) benefit	2,663	1,874
Net income (loss)	13,584	11,712
Property Management Acquisition and Development [Member]
Segment Reporting Information [Line Items]
Total assets	356,029		$ 359,681
Total revenues	9,360	7,750
Operating expenses, including depreciation and amortization	29,766	19,281
Income (loss) from operations	(20,406)	(11,531)
Loss on earnout from prior acquisition	(1,544)
Interest income	1,711	852
Interest expense	(794)	(274)
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes	(1,233)	(697)
Interest income on note receivable from Preferred Operating Partnership unit holder	1,213	1,213
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of partners' interests	26,923	2,857
Income tax (expense) benefit	743	380
Net income (loss)	6,613	(7,200)
Depreciation and amortization expense	2,311	2,163
Acquisition of real estate assets	(234,820)	(77,082)
Development and redevelopment of real estate assets	$ (6,543)	$ (3,140)

XML

Commitments and Contingencies - Additional Information (Detail) $ in Thousands	Mar. 31, 2016 USD ($) Store
Commitments And Contingencies [Line Items]
Litigation liability recorded | $	$ 4,000
Contract Amount [Member]
Commitments And Contingencies [Line Items]
Number of stores to be acquired	21
Purchase price | $	$ 349,376
Number of stores scheduled to be closed	26
Contract Amount [Member] | Joint Venture Partners [Member]
Commitments And Contingencies [Line Items]
Number of stores to be acquired	10
Purchase price | $	$ 302,800
Number of stores scheduled to be closed	7
Number of stores expected to be closed	3
Contract Amount [Member] | Construction [Member]
Commitments And Contingencies [Line Items]
Number of stores to be acquired	9

XML

Subsequent Events - Additional Information (Detail) $ in Thousands			3 Months Ended
	Apr. 20, 2016 USD ($) Store	Apr. 01, 2016 USD ($) Store	Mar. 31, 2016 USD ($)
Subsequent Event [Line Items]
Cash portion of payment for acquisition			$ 225,537
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of operating stores acquired | Store		10
Cash portion of payment for acquisition		$ 88,048
Number of stores sold | Store	7
Proceeds from sale of real estate	$ 18,000