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, 2017

or

o 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 300

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  o

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  o

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

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

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

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

The number of shares outstanding of the registrant’s common stock, par value $0.01 per share, as of May 1, 2017, was 125,964,453.

EXTRA SPACE STORAGE INC.

TABLE OF CONTENTS

STATEMENT ON FORWARD-LOOKING INFORMATION	3
PART I. FINANCIAL INFORMATION	4
ITEM 1. FINANCIAL STATEMENTS	4
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited)	10
ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	25
ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	39
ITEM 4. CONTROLS AND PROCEDURES	40
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	42
SIGNATURES	43

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, 2017			December 31, 2016
	(Unaudited)
Assets:
Real estate assets, net	$	6,770,593		$	6,770,447
Investments in unconsolidated real estate ventures	79,385			79,570
Cash and cash equivalents	29,311			43,858
Restricted cash	12,231			13,884
Receivables from related parties and affiliated real estate joint ventures	6,251			16,611
Other assets, net	136,586			167,076
Total assets	$	7,034,357		$	7,091,446
Liabilities, Noncontrolling Interests and Equity:
Notes payable, net	$	3,198,870		$	3,213,588
Exchangeable senior notes, net	612,233			610,314
Notes payable to trusts, net	117,352			117,321
Revolving lines of credit	363,000			365,000
Accounts payable and accrued expenses	77,106			101,388
Other liabilities	79,981			87,669
Total liabilities	4,448,542			4,495,280
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, 125,912,164 and 125,881,460 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	1,259			1,259
Additional paid-in capital	2,567,228			2,566,120
Accumulated other comprehensive income	22,816			16,770
Accumulated deficit	(355,187		)	(339,257		)
Total Extra Space Storage Inc. stockholders' equity	2,236,116			2,244,892
Noncontrolling interest represented by Preferred Operating Partnership units, net of $120,230 notes receivable	147,823			147,920
Noncontrolling interests in Operating Partnership	201,876			203,354
Total noncontrolling interests and equity	2,585,815			2,596,166
Total liabilities, noncontrolling interests and equity	$	7,034,357		$	7,091,446

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,
	2017			2016
Revenues:
Property rental	$	231,493		$	199,488
Tenant reinsurance	22,855			20,555
Management fees and other income	8,660			9,360
Total revenues	263,008			229,403
Expenses:
Property operations	66,645			61,112
Tenant reinsurance	3,920			4,311
Acquisition related costs and other	—			4,053
General and administrative	18,808			23,402
Depreciation and amortization	49,432			42,897
Total expenses	138,805			135,775
Income from operations	124,203			93,628
Loss on earnout from prior acquisition	—			(1,544		)
Interest expense	(35,970		)	(31,359		)
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	(1,269		)	(1,233		)
Interest income	1,102			1,714
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	89,279			62,419
Equity in earnings of unconsolidated real estate ventures	3,579			2,830
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partner's interest	—			26,923
Income tax expense	(3,124		)	(2,765		)
Net income	89,734			89,407
Net income allocated to Preferred Operating Partnership noncontrolling interests	(3,951		)	(3,180		)
Net income allocated to Operating Partnership and other noncontrolling interests	(3,501		)	(3,635		)
Net income attributable to common stockholders	$	82,282		$	82,592
Earnings per common share
Basic	$	0.65		$	0.66
Diluted	$	0.64		$	0.66
Weighted average number of shares
Basic	125,605,403			124,754,174
Diluted	132,618,644			131,956,094
Cash dividends paid per common share	$	0.78		$	0.59

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,
	2017		2016
Net income	$	89,734	$	89,407
Other comprehensive income (loss):
Change in fair value of interest rate swaps	6,334		(31,148		)
Total comprehensive income	96,068		58,259
Less: comprehensive income attributable to noncontrolling interests	7,740		5,254
Comprehensive income attributable to common stockholders	$	88,328	$	53,005

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			Shares		Par Value		Additional Paid-in Capital			Accumulated Other Comprehensive Income		Accumulated Deficit			Total Noncontrolling Interests and Equity
Balances at December 31, 2016	$	14,385		$	41,902		$	10,730		$	80,903		$	203,354		125,881,460		$	1,259	$	2,566,120		$	16,770	$	(339,257	)	$	2,596,166
Restricted stock grants issued	—			—			—			—			—			31,179		—					—		—			—
Restricted stock grants cancelled	—			—			—			—			—			(475	)	—		—			—		—			—
Compensation expense related to stock-based awards	—			—			—			—			—			—		—		1,990			—		—			1,990
Redemption of Operating Partnership units for cash	—			—			—			—			(872		)	—		—		(882		)	—		—			(1,754		)
Net income	1,818			629			676			828			3,501			—		—		—			—		82,282			89,734
Other comprehensive income	39			—			—			—			249			—		—		—			6,046		—			6,334
Distributions to Operating Partnership units held by noncontrolling interests	(1,954		)	(629		)	(676		)	(828		)	(4,356		)	—		—		—			—		—			(8,443		)
Dividends paid on common stock at $0.78 per share	—			—			—			—			—			—		—		—			—		(98,212		)	(98,212		)
Balances at March 31, 2017	$	14,288		$	41,902		$	10,730		$	80,903		$	201,876		125,912,164		$	1,259	$	2,567,228		$	22,816	$	(355,187	)	$	2,585,815

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,
	2017			2016
Cash flows from operating activities:
Net income	$	89,734		$	89,407
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	49,432			42,897
Amortization of deferred financing costs	3,103			2,823
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	1,269			1,233
Non-cash interest expense related to amortization of premium on notes payable	—			(354		)
Compensation expense related to stock-based awards	1,990			1,710
Gain on sale of real estate assets and purchase of joint venture partner's interest	—			(26,923		)
Loss on earnout from prior acquisition	—			(1,544		)
Distributions from unconsolidated real estate ventures in excess of earnings	1,123			998
Changes in operating assets and liabilities:
Receivables from related parties and affiliated real estate joint ventures	(1,438		)	(2,878		)
Other assets	4,336			(5,276		)
Accounts payable and accrued expenses	(30,069		)	(5,642		)
Other liabilities	(6,359		)	(985		)
Net cash provided by operating activities	113,121			95,466
Cash flows from investing activities:
Acquisition of real estate assets	(39,136		)	(234,820		)
Development and redevelopment of real estate assets	(5,246		)	(6,543		)
Change in restricted cash	1,653			(1,265		)
Investment in unconsolidated real estate ventures	(1,519		)	(4,794		)
Return of investment in unconsolidated real estate ventures	581			318
Purchase/issuance of notes receivable	—			(10,656		)
Principal payments received from notes receivable	44,869			—
Purchase of equipment and fixtures	(1,292		)	(908		)
Net cash used in investing activities	(90		)	(258,668		)
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 revolving lines of credit	169,000			195,976
Principal payments on notes payable and revolving lines of credit	(187,916		)	(32,859		)
Deferred financing costs	(253		)	(1,286		)
Net proceeds from exercise of stock options	—			13
Proceeds from termination of interest rate cap	—			1,650
Redemption of Operating Partnership units held by noncontrolling interests	(1,754		)	—
Dividends paid on common stock	(98,212		)	(73,827		)
Distributions to noncontrolling interests	(8,443		)	(6,446		)
Net cash provided by (used in) financing activities	(127,578		)	137,156
Net decrease in cash and cash equivalents	(14,547		)	(26,046		)
Cash and cash equivalents, beginning of the period	43,858			75,799
Cash and cash equivalents, end of the period	$	29,311		$	49,753

8

Extra Space Storage Inc.

Condensed Consolidated Statements of Cash Flows

(amounts in thousands)

(unaudited) 

	For the Three Months Ended March 31,
	2017			2016
Supplemental schedule of cash flow information
Interest paid	$	37,570		$	24,873
Income taxes paid	5,059			4,835
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
Additional paid-in capital	—			(272		)
Accrued construction costs and capital expenditures
Acquisition of real estate assets	$	4,797		$	—
Development and redevelopment of real estate assets	990			—
Other liabilities	(5,787		)	—
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, 2017, the Company had direct and indirect equity interests in 1,020 stores. In addition, the Company managed 421 stores for third parties, bringing the total number of stores which it owns and/or manages to 1,441. These stores are located in 38 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 and developing 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, 2017, are not necessarily indicative of results that may be expected for the year ending December 31, 2017. The condensed consolidated balance sheet as of December 31, 2016 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, 2016, 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. The new standard will become effective for annual and interim periods beginning after December 15, 2017 with early adoption permitted. The Company has determined that its property rental revenue and tenant reinsurance revenue will not be subject to the guidance in ASU 2014-09, as they qualify as lease contracts and insurance contracts, which are excluded from its scope. The Company's management fee revenue will be included in the scope of the standard. However, based on the Company's initial assessment, it appears that revenue recognized under the standard will not differ materially from revenue recognized under existing guidance. The Company continues to assess the potential impacts of ASU 2014-09. The Company anticipates adopting the standard using the modified retrospective transition method as of January 1, 2018.

10

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

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

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which modifies the accounting for leases, intending to increase transparency and comparability of organizations by requiring balance sheet presentation of leased assets and increased financial statement disclosure of leasing arrangements. ASU 2016-02 will require entities to recognize a liability for their lease obligations and a corresponding asset representing the right to use the underlying asset over the lease term. Lease obligations are to be measured at their present value and accounted for using the effective interest method. The accounting for the leased asset will differ slightly depending on whether the agreement is deemed to be a financing or operating lease. For financing leases, the leased asset is depreciated on a straight-line basis and depreciation expense is recorded separately from the interest expense in the statements of operations, resulting in higher expense in the earlier part of the lease term. For operating leases, the depreciation and interest expense components are combined, recognized evenly over the term of the lease, and presented as a reduction to operating income. ASU 2016-02 requires that assets and liabilities be presented or disclosed separately, and requires additional disclosure of certain qualitative and quantitative information related to these lease agreements. ASU 2016-02 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 2016-05, "Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships." ASU 2016-05 clarifies that a change in the counterparty to a derivative instrument that has been designated as a hedging instrument does not, in and of itself, require re-designation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The Company adopted this guidance on January 1, 2017. The adoption of ASU 2016-05 did not have a material impact 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. The Company adopted this guidance prospectively on January 1, 2017, and prior periods have not been adjusted. As a result of the adoption of this guidance, the Company no longer presents the tax effects from vesting of restricted stock grants and stock option exercises on its condensed consolidated statement of noncontrolling interests and equity.

In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments." ASU 2016-15 provides guidance on several specific cash flow issues, including the classification of debt prepayment or debt extinguishment costs, contingent consideration payments, and distributions received from equity method investees. This guidance is effective for fiscal years beginning after December 15, 2017. The Company is currently evaluating the new guidance to determine the impact it may have on its consolidated financial statements.

In October 2016, the FASB issued ASU 2016-18, "Statement of Cash Flows (Topic 230)," which requires that a statement of cash flows explains the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance is effective for fiscal years beginning after December 15, 2017, and 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.

In January 2017, the FASB issued ASU 2017-01, "Business Combinations (Topic 805): Clarifying the Definition of a Business," which provides guidance on whether transactions should be accounted for as acquisitions or disposals of assets or businesses. Specifically, when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or group of similar identifiable assets, the set of assets is not a business. Additionally, ASU 2017-01 also provides other guidance providing a more robust framework to use in determining whether a set of assets and activities is a business. This guidance is effective for annual periods beginning after December 15, 2017. Early adoption is permitted for transactions for which the acquisition or disposition date occurs before the issuance date or effective date of the amendments, only when the transaction has not been reported in financial statements that have been issued. The Company adopted ASU 2017-01 for new acquisitions beginning on January 1, 2017. The costs related to the acquisitions of stores that qualify as asset acquisitions will be capitalized as part of the purchase.

11

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

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

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, 2017, 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, 2017, aggregated by the level in the fair value hierarchy within which those measurements fall.

				Fair Value Measurements at Reporting Date Using
Description	March 31, 2017			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	$	28,744		$	—	$	28,744		$	—
Other liabilities - Cash Flow Hedge Swap Agreements	$	(1,073	)	$	—	$	(1,073	)	$	—

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, 2017 or December 31, 2016.

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.

12

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

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

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, 2017, the Company had one parcel of undeveloped land and 36 operating 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 relative 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, for those qualifying as asset acquisitions, are capitalized as a component of the cost of the assets acquired.

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, 2017 and December 31, 2016 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, 2017				December 31, 2016
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	124,837	$	120,230	$	125,642	$	120,230
Fixed rate notes receivable	$	21,649	$	20,608	$	53,450	$	52,201
Fixed rate notes payable and notes payable to trusts	$	2,329,582	$	2,360,128	$	2,404,996	$	2,417,558
Exchangeable senior notes	$	691,554	$	638,170	$	706,827	$	638,170

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

13

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

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

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, 2017 and 2016, options to purchase approximately 103,854 and 67,812 shares of common stock, respectively, were excluded from the computation of earnings per share as their effect would have been anti-dilutive.

For the purposes of computing the diluted impact of the potential exchange of the Preferred Operating Partnership 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 Preferred Operating Partnership units by the average share price for the period presented. The average share price for the three months ended March 31, 2017 and 2016 was $75.47 and $86.91, respectively. 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.

	For the Three Months Ended March 31,
	2017	2016
	Equivalent Shares (if converted)	Equivalent Shares (if converted)
Series B Units	555,216	482,133
Series C Units	392,727	341,032
Series D Units	1,071,983	157,747
	2,019,926	980,912

The Operating Partnership had $63,170 of its 2.375% Exchangeable Senior Notes due 2033 (the “2013 Notes”) issued and outstanding as of March 31, 2017. 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 $53.81 per share as of March 31, 2017, 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, 2017. 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 $94.47 per share as of March 31, 2017, 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

14

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

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

computation. For the three months ended March 31, 2017 and 2016, 336,848 and 441,598 shares, respectively, related to the 2013 Notes were included in the computation for diluted earnings per share. For the three months ended March 31, 2017 and 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 these periods.

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. Accordingly, the number of shares included in the computation for diluted earnings per share related to the Series A Units is equal to the number of Series A Units outstanding, with no additional shares included related to the fixed $115,000 amount.

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

	For the Three Months Ended March 31,
	2017			2016
Net income attributable to common stockholders	$	82,282		$	82,592
Earnings and dividends allocated to participating securities	(197		)	(165		)
Earnings for basic computations	82,085			82,427
Income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units) and Operating Partnership	4,049			5,474
Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units)	(1,271		)	(1,271		)
Net income for diluted computations	$	84,863		$	86,630
Weighted average common shares outstanding:
Average number of common shares outstanding - basic	125,605,403			124,754,174
OP Units	5,596,191			5,621,470
Series A Units	875,480			875,480
Shares related to exchangeable senior notes and dilutive stock options	541,570			704,970
Average number of common shares outstanding - diluted	132,618,644			131,956,094
Earnings per common share
Basic	$	0.65		$	0.66
Diluted	$	0.64		$	0.66

15

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

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

5. STORE ACQUISITIONS

The following table shows the Company’s acquisitions of operating stores for the three months ended March 31, 2017. The table excludes purchases of raw land or improvements made to existing assets.

			Consideration Paid				Total
Property Location	Number of Stores	Date of Acquisition	Cash Paid		Net Liabilities/(Assets) Assumed		Real estate assets
Illinois	1	2/1/2017	$	9,020	$	8	$	9,028
Georgia	1	1/6/2017	16,521		7		16,528
2017 Totals	2		$	25,541	$	15	$	25,556

6. VARIABLE INTERESTS

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

The Company has not provided financing or other support during the periods presented to the Trusts that it was not previously contractually obligated to provide. The Company’s maximum exposure to loss as a result of its involvement with the Trusts is equal to the total amount of the notes discussed above less the amounts of the Company’s investments in the Trusts’ common securities. The net amount is 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, 2017:

	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	(2,238		)
	$	117,352

The Company had no consolidated VIEs during the three months ended March 31, 2017.

16

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

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

7. DERIVATIVES

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

Cash Flow Hedges of Interest Rate Risk

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

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in accumulated other comprehensive income (“OCI”) and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. A portion of these changes is excluded from accumulated other comprehensive income as it is allocated to noncontrolling interests. During the three months ended March 31, 2017 and 2016, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. In the coming 12 months, the Company estimates that an additional $4,209 will be reclassified as an increase to interest expense.

The Company held 28 derivative financial instruments which had a total combined notional amount of $2,052,010 as of March 31, 2017.

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, 2017			December 31, 2016
Derivatives designated as hedging instruments:	Fair Value
Other assets	$	28,744		$	23,844
Other liabilities	$	(1,073	)	$	(2,447	)

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:

	Gain (loss) recognized in OCI For the Three Months Ended March 31,					Location of amounts reclassified from OCI into income	Gain (loss) reclassified from OCI For the Three Months Ended March 31,
Type	2017		2016				2017			2016
Swap Agreements	$	3,006	$	(34,960	)	Interest expense	$	(3,330	)	$	(4,454	)

17

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

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

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, 2017, 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 $1,361. As of March 31, 2017, the Company had not posted any collateral related to these agreements. If the Company had breached any of these provisions as of March 31, 2017, it could have been required to settle its obligations under the agreements at their termination value of $1,361, including accrued interest.

8. 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 2.0% 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 2015 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, 2017 was approximately 10.58 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, 2017 was approximately 18.58 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

18

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

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

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 and the 2015 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, 2017. Therefore, holders of the 2013 Notes may elect to exchange such notes during the quarter ending June 30, 2017. The price of the Company’s common stock did not exceed 130% of the exchange price for the required time period for the 2015 Notes during the quarter ended March 31, 2017.

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 approximated 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, 2017			December 31, 2016
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	$	63,170		$	63,170
Principal amount of liability component - 2015 Notes	575,000			575,000
Unamortized discount - equity component - 2013 Notes	(992		)	(1,187		)
Unamortized discount - equity component - 2015 Notes	(16,281		)	(17,355		)
Unamortized cash discount - 2013 Notes	(234		)	(281		)
Unamortized debt issuance costs	(8,430		)	(9,033		)
Net carrying amount of liability components	$	612,233		$	610,314

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,
	2017		2016
Contractual interest	$	4,867	$	4,882
Amortization of discount	1,269		1,233
Total interest expense recognized	$	6,136	$	6,115

19

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

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

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 repurchases 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	$	—

9. STOCKHOLDERS’ EQUITY

On May 6, 2016, the Company filed its current $400,000 "at the market" equity program with the Securities and Exchange Commission using a new shelf registration statement on Form S-3, and entered into separate equity distribution agreements with five sales agents. Under the terms of the current equity distribution agreements, the Company may from time to time offer and sell shares of common stock, up to the aggregate offering price of $400,000, through its sales agents.

During the quarter ended March 31, 2017, the Company did not issue any shares and had $349,375 available for issuance under the existing equity distribution agreements.

10. 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

20

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

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

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 5.0% 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

The Company completed the purchase of twelve stores in California 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. 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.

21

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

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

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 are convertible into OP Units at the option of the holder 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

On November 8, 2016, the Operating Partnership completed the acquisition of a store located in Illinois. This store was acquired in exchange for 486,244 Series D-4 Preferred Units ("D-4 Units") valued at $12,156.

On June 10, 2016, the Operating Partnership completed the acquisition of four stores located in Illinois. These stores were acquired in exchange for 2,201,467 Series D-3 Preferred Units ("D-3 Units") valued at $55,037.

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-1 Preferred Units ("D-1 Units," and together with the D-3 Units and D-4 Units, "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 $80,903. Holders of the Series D Units receive distributions at an annual rate between 3.5% to 5.0%. These distributions are cumulative. The Series D Units become redeemable at the option of the holder on the first anniversary of the date of issuance, which redemption obligation may be satisfied at the Company’s option in cash or shares of its common stock. In addition, the D-3 Units are convertible into OP Units at the option of the holder until the tenth anniversary of the date of issuance, with the number of OP Units to be issued equal to $25.00 per D-3 Unit, divided by the value of a share of common stock as of the exchange date.

11. 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 91.2% ownership interest in the Operating Partnership as of March 31, 2017. The remaining ownership interests in the Operating Partnership (including Preferred Operating Partnership units) of 8.8% 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, 2017 was $74.84 and there were 5,584,242 OP Units outstanding. Assuming that all of the OP Unit holders exercised their right to redeem all of their OP Units on March 31, 2017 and the

22

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

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

Company elected to pay the OP Unit holders cash, the Company would have paid $417,925 in cash consideration to redeem the units.

During the quarter, 23,796 OP Units were redeemed for $1,754 in cash.

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.

12. OTHER NONCONTROLLING INTERESTS

Other noncontrolling interests represent the ownership interests of a third party in one consolidated joint venture as of March 31, 2017. This joint venture owns an operating store in Texas. The voting interests of the third-party owner are 20.0%.

13. EQUITY IN EARNINGS OF UNCONSOLIDATED REAL ESTATE VENTURES—GAIN ON SALE OF REAL ESTATE AND PURCHASE OF JOINT VENTURE PARTNER'S INTEREST

On February 2, 2016, the Company acquired six stores from its VRS Self Storage LLC joint venture (“VRS”) in a step acquisition. These stores are located in Florida, Maryland, Nevada, New York, and Tennessee. The Company owns 45.04% of VRS, with the other 54.96% owned by affiliates of Prudential Global Investment Management ("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 stores 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 during the three months ended March 31, 2016 as a result of remeasuring 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 partner's interest on the Company’s condensed consolidated statements of operations. The Company recorded fixed assets related to this acquisition of $98,082, which includes total cash paid, the investment in ESP 122, and the step acquisition gain, less net assets acquired.

23

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

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

14.    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, 2017		December 31, 2016
Balance Sheet
Investment in unconsolidated real estate ventures
Rental operations	$	79,385	$	79,570
Total assets
Rental operations	$	6,729,670	$	6,731,292
Tenant reinsurance	33,611		44,524
Property management, acquisition and development	271,076		315,630
	$	7,034,357	$	7,091,446

	For the Three Months Ended March 31,
	2017			2016
Statement of Operations
Total revenues
Rental operations	$	231,493		$	199,488
Tenant reinsurance	22,855			20,555
Property management, acquisition and development	8,660			9,360
	263,008			229,403
Operating expenses, including depreciation and amortization
Rental operations	115,357			101,698
Tenant reinsurance	3,920			4,311
Property management, acquisition and development	19,528			29,766
	138,805			135,775
Income (loss) from operations
Rental operations	116,136			97,790
Tenant reinsurance	18,935			16,244
Property management, acquisition and development	(10,868		)	(20,406		)
	124,203			93,628
Loss on earnout from prior acquisition
Property management, acquisition and development	—			(1,544		)
Interest expense
Rental operations	(34,821		)	(30,565		)
Property management, acquisition and development	(1,149		)	(794		)
	(35,970		)	(31,359		)
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes
Property management, acquisition and development	(1,269		)	(1,233		)
Interest income
Property management, acquisition and development	1,102			1,714
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	3,579			2,830
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partner's interest
Property management, acquisition and development	—			26,923
Income tax (expense) benefit
Rental operations	(463		)	(845		)
Tenant reinsurance	(3,263		)	(2,663		)
Property management, acquisition and development	602			743
	(3,124		)	(2,765		)
Net income (loss)
Rental operations	84,431			69,210
Tenant reinsurance	15,672			13,581
Property management, acquisition and development	(10,369		)	6,616
	$	89,734		$	89,407

	For the Three Months Ended March 31,
	2017			2016
Depreciation and amortization expense
Rental operations	$	48,712		$	40,586
Property management, acquisition and development	720			2,311
	$	49,432		$	42,897
Statement of Cash Flows
Acquisition of real estate assets
Property management, acquisition and development	$	(39,136	)	$	(234,820	)
Development and redevelopment of real estate assets
Property management, acquisition and development	$	(5,246	)	$	(6,543	)

15. COMMITMENTS AND CONTINGENCIES

As of March 31, 2017, 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.

24

EXTRA SPACE STORAGE INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited) (continued)

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

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 has a liability of $5,600 at March 31, 2017, which is included in other liabilities on the condensed consolidated balance sheet.

As of March 31, 2017, the Company was under agreement to acquire two operating stores and 13 stores to be acquired upon the completion of construction. The total purchase price of all stores with commitments was $165,581. Of these stores, six are scheduled to close in 2017. The remaining stores will close upon completion of construction, expected to occur on various dates in 2018 and 2019. Additionally, the Company is under agreement to acquire 23 stores with joint venture partners, for a total purchase price of $141,887. Eleven of these stores are scheduled to close in 2017, while the remaining twelve stores are expected to close in 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 stores, the activities of its tenants and other environmental conditions of which the Company is unaware with respect to its stores could result in future material environmental liabilities.

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, 2016. 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, 2016 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.

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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 our tenant reinsurance program; and from management fees on the stores we manage for joint venture partners and unaffiliated third parties. Our management fee is equal to approximately 6.0% of cash collected from the managed stores.

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.

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

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

PROPERTIES

As of March 31, 2017, we owned, had ownership interests in, or managed 1,441 stores in 38 states, Washington, D.C. and Puerto Rico. Of these 1,441 stores, we owned 838 stores, we held joint venture interests in 182 stores, and our taxable REIT subsidiary, Extra Space Management, Inc., operated an additional 421 stores that are owned by third parties. These operating stores contain approximately 109 million square feet of rentable space in approximately 980,000 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 of the current year, or has been open for three years prior to January 1 of the current year.

26

As of March 31, 2017, approximately 865,000 tenants were leasing storage units at the 1,441 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, 2017, the average length of stay was approximately 14.3 months for tenants who have vacated in the last 12 months.

The average annual rent per square foot for our existing customers at stabilized stores, net of discounts and bad debt, was $15.23for the three months ended March 31, 2017, compared to $14.49for the three months ended March 31, 2016. Average annual rent per square foot for new leases was $16.19for the three months ended March 31, 2017, compared to $15.57for the three months ended March 31, 2016. The average discount, as a percentage of rental revenues, during these periods was 4.1% and 3.9%, 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, 2017 and 2016. The information as of March 31, 2016 is on a pro forma basis as though all the stores owned and/or managed at March 31, 2017 were under our control as of March 31, 2016.

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, 20171	Number of Units as of March 31, 2016	Net Rentable Square Feet as of March 31, 20172	Net Rentable Square Feet as of March 31, 2016	Square Foot Occupancy % March 31, 2017		Square Foot Occupancy % March 31, 2016
Wholly-Owned Stores
Alabama	8	4,645	4,590	556,491	559,426	89.2	%	90.5	%
Arizona	22	13,745	13,575	1,534,438	1,537,206	93.7	%	91.1	%
California	143	110,239	108,443	11,410,561	11,397,438	94.9	%	94.7	%
Colorado	13	6,961	6,573	847,732	822,174	89.2	%	92.0	%
Connecticut	7	5,088	4,952	495,072	485,116	91.0	%	92.1	%
Florida	78	56,201	55,307	5,944,046	5,930,100	92.1	%	93.1	%
Georgia	49	29,575	28,783	3,770,139	3,743,076	90.7	%	90.3	%
Hawaii	9	8,536	8,441	602,125	599,240	94.6	%	91.6	%
Illinois	27	19,154	18,739	2,057,553	2,021,956	90.7	%	89.1	%
Indiana	15	7,866	7,741	939,659	943,111	92.6	%	92.8	%
Kansas	1	534	530	49,999	49,991	95.2	%	94.0	%
Kentucky	10	5,874	5,843	763,540	756,435	91.7	%	86.9	%
Louisiana	2	1,407	1,407	149,930	150,090	95.0	%	90.6	%
Maryland	29	22,442	22,312	2,293,005	2,292,727	91.5	%	91.7	%
Massachusetts	38	23,876	23,679	2,362,130	2,366,096	91.6	%	91.2	%
Michigan	4	2,399	2,370	324,516	324,366	94.0	%	90.0	%
Minnesota	1	765	765	74,550	74,550	81.2	%	76.7	%
Mississippi	3	1,508	1,473	217,722	220,402	91.1	%	82.6	%
Missouri	6	3,331	3,239	389,386	385,961	92.7	%	91.9	%
Nevada	15	9,118	9,115	1,313,801	1,315,241	94.2	%	89.7	%
New Hampshire	2	1,046	1,030	125,987	126,233	92.4	%	93.2	%
New Jersey	58	45,769	45,185	4,500,808	4,494,921	93.5	%	91.9	%

27

		Company	Pro forma	Company	Pro forma	Company		Pro forma
Location	Number of Stores	Number of Units as of March 31, 20171	Number of Units as of March 31, 2016	Net Rentable Square Feet as of March 31, 20172	Net Rentable Square Feet as of March 31, 2016	Square Foot Occupancy % March 31, 2017		Square Foot Occupancy % March 31, 2016
New Mexico	12	6,582	6,580	747,408	749,833	92.5	%	92.3	%
New York	21	19,272	19,213	1,550,487	1,548,105	91.3	%	91.3	%
North Carolina	12	7,851	7,796	846,955	847,705	91.4	%	90.3	%
Ohio	17	9,545	9,492	1,249,259	1,247,243	92.6	%	90.9	%
Oregon	4	2,784	2,755	327,287	326,527	93.5	%	89.9	%
Pennsylvania	14	9,771	9,639	1,053,544	1,043,786	90.7	%	86.7	%
Rhode Island	2	1,281	1,252	131,421	131,681	93.7	%	90.6	%
South Carolina	21	11,983	11,820	1,568,884	1,569,464	88.5	%	87.8	%
Tennessee	23	12,951	12,751	1,763,171	1,781,351	91.8	%	88.6	%
Texas	90	58,710	57,966	7,534,310	7,486,505	89.2	%	88.5	%
Utah	7	3,860	3,858	477,007	476,601	94.5	%	95.2	%
Virginia	40	30,479	29,988	3,223,201	3,219,285	91.4	%	90.5	%
Washington	7	4,316	4,284	509,578	509,408	96.7	%	95.1	%
Washington, DC	1	1,217	1,214	99,639	99,439	93.4	%	89.2	%
Total Wholly-Owned Stabilized	811	560,681	552,700	61,805,341	61,632,789	92.1	%	91.3	%
Joint-Venture Stores
Alabama	1	619	600	75,356	75,016	94.1	%	92.2	%
Arizona	6	3,743	3,695	429,173	428,909	95.7	%	92.4	%
California	47	34,052	33,572	3,282,336	3,280,883	95.0	%	95.1	%
Colorado	2	1,313	1,315	158,096	158,070	90.0	%	91.2	%
Connecticut	5	3,762	3,767	404,720	404,950	93.1	%	92.0	%
Delaware	1	518	596	64,510	71,610	95.0	%	82.0	%
Florida	12	10,045	9,901	1,005,362	1,001,393	91.3	%	93.7	%
Georgia	1	604	605	81,770	81,900	89.8	%	86.7	%
Illinois	4	2,690	2,690	288,171	287,450	91.7	%	91.2	%
Indiana	1	445	446	56,650	57,114	93.7	%	92.6	%
Kansas	2	847	848	109,525	109,565	92.5	%	91.0	%
Kentucky	3	1,378	1,448	153,775	171,525	91.2	%	86.9	%
Maryland	7	5,899	5,877	530,223	529,485	91.5	%	91.7	%
Massachusetts	9	5,115	5,080	534,085	535,573	91.6	%	90.2	%
Michigan	5	3,212	3,182	395,929	396,354	93.3	%	93.0	%
Missouri	1	544	541	61,375	61,075	87.5	%	88.5	%
Nevada	2	1,208	1,200	123,590	123,545	95.3	%	92.1	%
New Hampshire	2	796	801	83,685	85,061	94.0	%	91.8	%
New Jersey	13	10,385	10,292	1,028,426	1,028,869	92.0	%	91.9	%
New Mexico	2	1,051	1,044	134,403	134,115	93.3	%	90.1	%
New York	8	7,743	7,670	653,129	648,800	93.5	%	93.2	%
Ohio	5	2,878	2,857	381,732	381,462	91.2	%	88.4	%
Oregon	1	649	655	64,970	64,970	93.0	%	96.1	%
Pennsylvania	4	2,731	2,683	312,375	312,331	91.9	%	88.3	%
Tennessee	6	3,831	3,772	474,800	474,150	93.3	%	93.9	%
Texas	10	5,790	5,747	672,173	673,449	90.0	%	92.5	%
Virginia	7	5,097	5,076	514,037	514,132	90.9	%	90.8	%

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		Company	Pro forma	Company	Pro forma	Company		Pro forma
Location	Number of Stores	Number of Units as of March 31, 20171	Number of Units as of March 31, 2016	Net Rentable Square Feet as of March 31, 20172	Net Rentable Square Feet as of March 31, 2016	Square Foot Occupancy % March 31, 2017		Square Foot Occupancy % March 31, 2016
Washington, DC	1	1,694	1,693	104,434	104,690	89.5	%	91.0	%
Total Joint-Venture Stabilized	168	118,639	117,653	12,178,810	12,196,446	92.9	%	92.6	%
Managed Stores
Alabama	11	5,747	5,569	753,514	734,403	90.7	%	89.0	%
Arizona	5	2,629	2,646	312,742	322,956	90.2	%	88.7	%
California	74	51,768	49,578	6,209,339	5,968,429	92.2	%	93.0	%
Colorado	16	8,991	8,378	1,069,482	1,012,894	87.6	%	83.3	%
Connecticut	2	1,421	1,328	182,140	172,503	93.1	%	94.1	%
Florida	47	32,818	32,468	3,913,454	3,909,536	92.7	%	92.9	%
Georgia	8	4,091	3,932	580,107	576,170	94.7	%	93.1	%
Hawaii	6	4,630	4,790	352,070	349,804	91.7	%	92.2	%
Illinois	12	7,158	7,176	743,868	744,051	90.7	%	84.9	%
Indiana	4	2,031	2,017	238,458	237,048	93.6	%	87.1	%
Kentucky	2	1,331	1,334	218,287	219,667	94.3	%	89.6	%
Louisiana	1	987	983	133,330	131,605	92.9	%	89.7	%
Maryland	20	14,539	14,463	1,410,115	1,408,617	91.5	%	88.7	%
Massachusetts	3	1,548	1,529	182,945	182,735	90.2	%	90.9	%
Michigan	6	3,357	3,353	416,485	416,350	93.3	%	85.8	%
Missouri	4	2,153	2,129	253,999	251,341	93.8	%	85.5	%
Nevada	11	9,411	9,417	1,142,296	1,141,501	93.8	%	85.9	%
New Jersey	5	3,182	3,178	303,200	309,355	92.9	%	90.2	%
New Mexico	1	824	802	108,495	103,535	91.5	%	86.2	%
New York	4	3,220	2,895	275,580	252,932	89.8	%	90.2	%
North Carolina	18	7,570	7,567	1,043,292	1,056,445	92.5	%	88.9	%
Ohio	5	2,283	2,217	274,870	273,850	92.8	%	92.5	%
Oklahoma	11	5,780	5,779	963,614	957,729	83.3	%	80.4	%
Oregon	1	448	447	39,430	39,435	98.1	%	95.2	%
Pennsylvania	18	10,774	10,649	1,248,784	1,244,635	92.2	%	91.9	%
South Carolina	5	3,607	3,601	448,449	446,139	91.1	%	90.5	%
Tennessee	4	2,281	2,143	287,694	290,523	92.8	%	90.3	%
Texas	25	15,047	14,971	2,111,245	2,072,303	90.0	%	89.2	%
Utah	5	2,764	2,538	402,727	380,047	94.6	%	94.4	%
Virginia	8	4,710	4,691	488,878	489,328	90.9	%	90.5	%
Washington	3	1,536	1,537	186,677	186,677	90.9	%	91.4	%
Puerto Rico	4	2,723	2,686	287,779	287,314	87.9	%	85.6	%
Total Managed Stabilized	350	222,036	217,468	26,674,034	26,260,546	91.5	%	90.1	%
Total Stabilized Stores	1,329	901,356	887,821	100,658,185	100,089,781	92.1	%	91.2	%

(1) Represents unit count as of March 31, 2017, which may differ from unit count as of March 31, 2016 due to unit conversions or expansions.

(2) Represents net rentable square feet as of March 31, 2017, which may differ from rentable square feet as of March 31, 2016 due to unit conversions or expansions.

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The following table presents additional information regarding the occupancy of our lease-up stores by state as of March 31, 2017 and 2016. The information as of March 31, 2016 is on a pro forma basis as though all the stores owned and/or managed at March 31, 2017 were under our control as of March 31, 2016.

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, 20171	Number of Units as of March 31, 2016	Net Rentable Square Feet as of March 31, 20172	Net Rentable Square Feet as of March 31, 2016	Square Foot Occupancy % March 31, 2017		Square Foot Occupancy % March 31, 2016
Wholly-Owned Stores
Arizona	1	604	—	63,395	—	95.3	%	—	%
California	4	2,653	1,198	261,091	132,846	81.2	%	56.8	%
Florida	1	686	679	80,803	79,895	97.2	%	56.6	%
Georgia	5	3,133	1,259	373,783	167,109	66.0	%	53.5	%
Illinois	3	2,725	1,077	253,117	82,043	37.9	%	3.2	%
Massachusetts	2	1,987	957	139,194	85,284	62.3	%	4.8	%
New York	1	822	818	100,480	100,480	56.1	%	92.2	%
North Carolina	2	1,539	1,059	145,857	105,334	70.0	%	57.3	%
South Carolina	1	695	695	78,680	78,680	80.6	%	53.4	%
Texas	5	2,980	2,444	411,186	336,511	83.4	%	62.4	%
Utah	2	1,176	371	143,752	46,580	56.3	%	—	%
Total Wholly-Owned in Lease-up	27	19,000	10,557	2,051,338	1,214,762	69.5	%	54.8	%
Joint-Venture Stores
Arizona	1	604	606	62,200	62,200	93.7	%	53.6	%
Colorado	1	816	814	84,855	85,043	50.4	%	0.7	%
Florida	3	1,953	—	201,823	—	14.9	%	—	%
New Jersey	1	872	873	74,126	74,511	93.3	%	59.4	%
New York	3	3,866	2,743	209,592	130,324	57.0	%	21.5	%
Oregon	2	796	272	71,605	27,100	59.9	%	64.8	%
Texas	1	533	—	55,325	—	67.8	%	—	%
South Carolina	1	683	665	80,676	75,670	73.7	%	33.9	%
Washington	1	624	—	82,485	—	75.2	%	—	%
Total Joint-Venture in Lease-up	14	10,747	5,973	922,687	454,848	56.5	%	32.8	%
Managed Stores
Arizona	1	838	—	89,945	—	68.0	%	—	%
California	4	3,797	524	461,167	67,175	51.6	%	39.6	%
Colorado	3	1,713	1,234	198,250	142,219	63.4	%	33.3	%
Connecticut	1	330	—	35,105	—	68.2	%	—	%
Florida	7	4,771	776	432,500	86,605	33.2	%	40.8	%
Georgia	3	1,913	553	206,543	69,367	47.8	%	62.3	%
Illinois	6	3,389	—	350,018	—	43.4	%	—	%

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		Company	Pro forma	Company	Pro forma	Company		Pro forma
Location	Number of Stores	Number of Units as of March 31, 20171	Number of Units as of March 31, 2016	Net Rentable Square Feet as of March 31, 20172	Net Rentable Square Feet as of March 31, 2016	Square Foot Occupancy % March 31, 2017		Square Foot Occupancy % March 31, 2016
Indiana	3	1,680	—	188,538	—	44.3	%	—	%
Kentucky	1	242	—	25,999	—	35.0	%	—	%
Maryland	3	1,965	1,194	201,658	102,701	53.1	%	54.4	%
Massachusetts	2	1,918	902	153,593	70,106	55.9	%	62.8	%
Minnesota	4	2,478	643	243,087	62,713	68.0	%	21.3	%
New Hampshire	1	372	—	35,196	—	47.6	%	—	%
New Jersey	2	1,498	990	175,615	109,952	42.9	%	1.1	%
North Carolina	7	4,636	1,976	500,915	242,104	50.7	%	43.0	%
Ohio	2	990	535	109,504	67,860	56.9	%	61.3	%
Oklahoma	1	508	—	68,335	—	27.8	%	—	%
South Carolina	4	2,744	627	332,139	67,375	38.4	%	50.9	%
Texas	11	8,050	566	885,524	65,409	22.6	%	11.8	%
Utah	1	378	—	44,149	—	76.1	%	—	%
Virginia	1	1,072	—	118,269	—	15.9	%	—	%
Wisconsin	2	1,930	—	238,013	—	32.5	%	—	%
Total Managed in Lease-up	71	47,986	10,520	5,169,844	1,153,586	42.2	%	39.4	%
Total Lease-up Stores	112	77,733	27,050	8,143,869	2,823,196	50.7	%	45.0	%

(1) Represents unit count as of March 31, 2017, which may differ from unit count as of March 31, 2016 due to unit conversions or expansions.

(2) Represents net rentable square feet as of March 31, 2017, which may differ from rentable square feet as of March 31, 2016 due to unit conversions or expansions.

RESULTS OF OPERATIONS

Comparison of the three months ended March 31, 2017 and 2016

Overview

Results for the three months ended March 31, 2017 included the operations of 1,020 stores (838 wholly-owned, one in a consolidated joint venture, and 181 in joint ventures accounted for using the equity method) compared to the results for the three months ended March 31, 2016, which 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).

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Revenues

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

	For the Three Months Ended March 31,
	2017		2016		$ Change			% Change
Revenues:
Property rental	$	231,493	$	199,488	$	32,005		16.0	%
Tenant reinsurance	22,855		20,555		2,300			11.2	%
Management fees and other income	8,660		9,360		(700		)	(7.5	)%
Total revenues	$	263,008	$	229,403	$	33,605		14.6	%

Property Rental—The increase in property rental revenues for the three months ended March 31, 2017 was primarily the result of an increase of $20,639 associated with acquisitions completed in 2017 and 2016. We acquired two stores during the three months ended March 31, 2017 and 99 stores during the year ended December 31, 2016. Property rental revenue also increased by $11,289 during the three months ended March 31, 2017, as a result of increases in occupancy and rental rates to new and existing customers at our stabilized stores. Occupancy at our wholly-owned stabilized stores increased to 92.1% at March 31, 2017, as compared to 91.3% at March 31, 2016. The achieved rental rate to new tenants on wholly owned stores for the three months ended March 31, 2017 increased an average of approximately 4.0% 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 1,441 stores at March 31, 2017 compared to 1,371 stores at March 31, 2016. Additionally, average revenue per policy was higher during the three months ended March 31, 2017 when compared to the same period in the prior year.

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 generally represent approximately 6.0% of cash collected from these stores. The decrease in management fee revenues was primarily due to a decrease in the number of joint venture stores managed as a result of our acquisition of 40 wholly-owned stores from various joint ventures in 2016. We managed 182 stores for joint ventures at March 31, 2017, compared to 249 stores managed for joint ventures at March 31, 2016.

Expenses

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

	For the Three Months Ended March 31,
	2017		2016		$ Change			% Change
Expenses:
Property operations	$	66,645	$	61,112	$	5,533		9.1	%
Tenant reinsurance	3,920		4,311		(391		)	(9.1	)%
Acquisition related costs and other	—		4,053		(4,053		)	(100.0	)%
General and administrative	18,808		23,402		(4,594		)	(19.6	)%
Depreciation and amortization	49,432		42,897		6,535			15.2	%
Total expenses	$	138,805	$	135,775	$	3,030		2.2	%

Property Operations—The increase in property operations expense during the three months ended March 31, 2017 is due primarily to an increase of $6,886 related to store acquisitions completed in 2017 and 2016. We acquired two operating stores during the three months ended March 31, 2017, and 99 operating stores during the year ended December 31, 2016. Property operating expenses at our lease-up stores increased by $320. These increases were partially offset by a decrease in expenses at stabilized stores of $1,271 due to decreases in office, insurance, and payroll expenses, and a decrease in expenses of $410 related to the sale of nine stores during the year ended December 31, 2016.

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Tenant Reinsurance—Tenant reinsurance expense represents the costs that are incurred to provide tenant reinsurance.

Acquisition Related Costs and Other—For the three months ended March 31, 2016, these costs represented closing and other transaction costs incurred in connection with our acquisition of operating stores, which were accounted for as business combinations. On January 1, 2017, we adopted the guidance in ASU 2017-01, "Business Combinations (Topic 805) - Clarifying the Definition of a Business," which provides that when substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets, the set of assets is not a business. As a result of the adoption of this guidance, acquisitions of operating stores are now considered asset acquisitions, under which transaction costs are capitalized as a component of the cost of the assets acquired, rather than being expensed as incurred as required with business combinations.

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, 2017 decreased when compared to the same period in the prior year primarily as a result of the accrual of $4,000 during the three months ended March 31, 2016 related to the potential settlement of a legal action. There were no such expenses during the three months ended March 31, 2017. We did not observe any other material trends in specific payroll, travel or other expenses that contributed to the decrease in general and administrative expenses.

Depreciation and Amortization—Depreciation and amortization expense increased as a result of the acquisition of new stores. We acquired two operating stores during the three months ended March 31, 2017 and 99 operating stores during the year ended December 31, 2016.

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,
	2017			2016			$ Change			% Change
Other income and expenses:
Loss on earnout from prior acquisition	$	—		$	(1,544	)	$	1,544		(100.0	)%
Interest expense	(35,970		)	(31,359		)	(4,611		)	14.7	%
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	(1,269		)	(1,233		)	(36		)	2.9	%
Interest income	1,102			1,714			(612		)	(35.7	)%
Interest income on note receivable from Preferred Operating Partnership unit holder	1,213			1,213			—			—
Equity in earnings of unconsolidated real estate ventures	3,579			2,830			749			26.5	%
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partner's interest	—			26,923			(26,923		)	100.0	%
Income tax expense	(3,124		)	(2,765		)	(359		)	13.0	%
Total other expense, net	$	(34,469	)	$	(4,221	)	$	(30,248	)	716.6	%

Loss on Earnout from Prior Acquisition—During the three months ended March 31, 2016, we expensed $1,544 for an earnout on the acquisition of a small portfolio of stores that we acquired in 2014, due to the stores' operating income exceeding the original estimates. There were no similar expenses during three months ended March 31, 2017.

Interest Expense—The increase in interest expense during the three months ended March 31, 2017 was primarily the result of higher debt balances during this period when compared to the same period in the prior year. The total face value of our debt, including our lines of credit, was $4,344,781 at March 31, 2017 compared to $3,741,731 at March 31, 2016.

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

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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. 

Interest Income—Interest income represents amounts earned on cash and cash equivalents deposited with financial institutions and interest earned on notes receivable. The decrease for the three months ended March 31, 2017 related primarily to the decrease in notes receivable when compared to the same period in the prior year. We had $27,475 of notes receivable included in assets on the condensed consolidated balance sheets as of March 31, 2017, compared to $85,461 as of March 31, 2016. 

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. In these joint ventures, we and our joint venture partners generally receive a preferred return on our invested capital. To the extent that cash/profits in excess of these preferred returns are generated, we receive a higher percentage of the excess cash/profits. The increase for the three months ended March 31, 2017 compared to the same period in the prior year was primarily the result of three of our joint ventures generating cash in excess of the preferred returns, resulting in increased distributions and equity in earnings. This increase was slightly offset by a decrease in the number of stores owned by our joint ventures as a result of transactions, including the acquisition of 40 stores from joint ventures during the year ended December 31, 2016.

Equity in Earnings of Unconsolidated Real Estate Ventures—Gain on Sale of Real Estate Assets and Purchase of Joint Venture Partner's Interest—On February 2, 2016, we acquired six stores from our VRS Self Storage LLC joint venture (“VRS”) in a step acquisition. We recorded a gain of $26,923 as a result of re-measuring to fair value our existing equity interest. There were no such gains during the three months ended March 31, 2017.

Income Tax Expense—For the three months ended March 31, 2017, 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.

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,
	2017			2016			$ Change			% Change
Net income allocated to noncontrolling interests:
Net income allocated to Preferred Operating Partnership noncontrolling interests	$	(3,951	)	$	(3,180	)	$	(771	)	24.2	%
Net income allocated to Operating Partnership and other noncontrolling interests	(3,501		)	(3,635		)	134			(3.7	)%
Total income allocated to noncontrolling interests:	$	(7,452	)	$	(6,815	)	$	(637	)	9.3	%

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, 2017 and 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 0.6% 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 4.1% and 4.2% 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, 2017 and 2016, 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

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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. FFO should not be considered a replacement of net income computed in accordance with GAAP.

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.

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

	For the Three Months Ended March 31,
	2017			2016
Net income attributable to common stockholders	$	82,282		$	82,592
Adjustments:
Real estate depreciation	41,913			36,436
Amortization of intangibles	6,161			4,736
Loss on earnout from prior acquisition	—			1,544
Unconsolidated joint venture real estate depreciation and amortization	1,363			1,015
Unconsolidated joint venture gain on sale of real estate and purchase of partner's interest	—			(26,923		)
Distributions paid on Series A Preferred Operating Partnership units	(1,271		)	(1,271		)
Income allocated to Operating Partnership noncontrolling interests	7,453			6,816
Funds from operations attributable to common stockholders and unit holders	$	137,901		$	104,945

SAME-STORE RESULTS

Our same-store pool for the periods presented consists of 732 stores that are wholly-owned and operated and that were stabilized by the first day of the earliest calendar year presented. We consider a store to be stabilized once it has been open for three years or has sustained average square foot occupancy of 80% or more for one calendar year. We believe that by providing same-store results from a stabilized pool of stores, with accompanying operating metrics including, but not limited to: occupancy, rental revenue growth, operating expense growth, net operating income growth, etc., stockholders and potential investors are able to evaluate operating performance without the effects of non-stabilized occupancy levels, rent levels, expense levels, acquisitions or completed developments.  Same-store results should not be used as a basis for future same-store performance or for the performance of our stores as a whole. The following table presents operating data for our same-store portfolio.

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	For the Three Months Ended March 31,						Percent
	2017			2016			Change
Same-store rental revenues	$	206,569		$	195,220		5.8	%
Same-store operating expenses	57,625			58,789			(2.0	)%
Same-store net operating income	$	148,944		$	136,431		9.2	%
Same-store square foot occupancy as of quarter end	92.2		%	91.4		%
Properties included in same-store	732			732

Same-store revenues for the three months ended March 31, 2017 increased due to gains in occupancy and higher rental rates for both new and existing customers. Expenses were lower for the three months ended March 31, 2017 due to decreases across most expense categories. The most significant decreases to expenses were in office, insurance and payroll. Decreases in expenses were partially offset by increases in marketing expenses.

The following table presents a reconciliation of same-store net operating income to net income as presented on our condensed consolidated statements of operations for the periods indicated:

	For the Three Months Ended March 31,
	2017			2016
Net income	$	89,734		$	89,407
Adjusted to exclude:
Loss on earnout from prior acquisition	—			1,544
Equity in earnings of unconsolidated real estate joint ventures	(3,579		)	(2,830		)
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partner's interest	—			(26,923		)
Acquisition related costs and other	—			4,053
Interest expense	37,239			32,592
Depreciation and amortization	49,432			42,897
Income tax expense	3,124			2,765
General and administrative (includes stock compensation)	18,808			23,402
Management fees, other income and interest income	(10,975		)	(12,287		)
Net tenant reinsurance	(18,935		)	(16,244		)
Non same-store revenue	(24,924		)	(4,268		)
Non same-store expenses	9,020			2,323
Total same-store NOI	$	148,944		$	136,431
Same-store rental revenues	$	206,569		$	195,220
Same-store operating expenses	57,625			58,789
Total same-store NOI	$	148,944		$	136,431

36

CASH FLOWS

Cash flows provided by operating activities were $113,121 and $95,466, respectively for the three months ended March 31, 2017 and 2016. The increase was primarily due to a non-cash gain on the purchase of joint venture partners’ interests of $26,923 recorded during the three months ended March 31, 2016. This gain was related to the two step acquisitions of stores that were previously owned by our VRS joint venture. There were no such gains during the three months ended March 31, 2017. There were also increases in depreciation and amortization expense of $6,535 and changes in other assets of $9,612 for the three months ended March 31, 2017 when compared with the same period in the prior year. These increases were offset by a decrease in accounts payable and accrued expenses of $24,427 for the three months ended March 31, 2017, when compared to the same period in the prior year.

Cash used in investing activities was $90 and $258,668, respectively, for the three months ended March 31, 2017 and 2016. The decrease was primarily due to a decrease in cash paid for the acquisition of real estate assets of $195,684. We purchased two stores during the three months ended March 31, 2017, compared to 23 stores purchased during the three months ended March 31, 2016.  In addition, we received principal payments of $44,869 on our notes receivable during the three months ended March 31, 2017.

Cash used in financing activities was $127,578 for the three months ended March 31, 2017, compared to cash provided by financing activities of $137,156 for the three months ended March 31, 2016. The change related primarily to an increase in principal payments on notes payable and revolving lines of credit of $155,057, a decrease in net proceeds from the sale of common stock of $73,574, and a decrease in the proceeds from notes payable and revolving lines of credit of $26,976 for the three months ended March 31, 2017 when compared to the same period in the prior year. 

LIQUIDITY AND CAPITAL RESOURCES

As of March 31, 2017, we had $29,311 available in cash and cash equivalents. 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 2016 and the first three months of 2017, 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.

	As of March 31, 2017
Revolving Lines of Credit	Amount Drawn		Capacity		Interest Rate		Origination Date	Maturity	Basis Rate (1)
Credit Line 1 (2)	$	26,000	$	100,000	2.6	%	6/4/2010	6/30/2018	LIBOR plus 1.7%
Credit Line 2 (3)(4)	337,000		500,000		2.4	%	10/14/2016	10/14/2020	LIBOR plus 1.4%
	$	363,000	$	600,000

⁽¹⁾  30-day USD LIBOR

⁽²⁾  Secured by mortgages on certain real estate assets. One two-year extension available.

⁽³⁾  Unsecured. Two six-month extensions available.

⁽⁴⁾     Basis Rate as of March 31, 2017. Rate is subject to change based on our consolidated leverage ratio.

As of March 31, 2017, we had $4,344,781 face value of debt, resulting in a debt to total enterprise value ratio of 30.3%. As of March 31, 2017, the ratio of total fixed-rate debt and other instruments to total debt was 69.0% (including $2,141,301 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, 2017 was 3.1%. 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, 2017.

37

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 revolving lines of credit, including undrawn portions of our unsecured facility. In addition, we are pursuing additional sources of financing based on anticipated funding needs.

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 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

38

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 store or stores 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 stores. 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 stores as part of our consolidated indebtedness.

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, 2017, we had $4,344,781 in total face value of debt, of which $1,346,484 was subject to variable interest rates (excluding debt with interest rate swaps). If LIBOR were to increase or decrease by 100 basis points, the increase or decrease in interest expense on the variable-rate debt would increase or decrease future earnings and cash flows by $13,465 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.

39

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

	March 31, 2017				December 31, 2016
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	124,837	$	120,230	$	125,642	$	120,230
Fixed rate notes receivable	$	21,649	$	20,608	$	53,450	$	52,201
Fixed rate notes payable and notes payable to trusts	$	2,329,582	$	2,360,128	$	2,404,996	$	2,417,558
Exchangeable senior notes	$	691,554	$	638,170	$	706,827	$	638,170

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 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 several legal proceedings pending against us that include 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 these litigation matters, we have a liability of $5,600 which is included in other liabilities on the consolidated balance sheets.

ITEM 1A. RISK FACTORS

In addition to the other information set forth in this report, you should carefully consider the factors discussed in “Part I. Item 1A. Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2016, which could materially affect our business, financial condition and results of operations. There have been no material changes to the risk factors described in the “Risk Factors” section in our Annual Report on Form 10-K for the year ended December 31, 2016. The risks described in our Annual Report on Form 10-K are not the only risks facing our company. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial may also materially adversely affect our business, financial condition and results of operations.

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.

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ITEM 6. EXHIBITS

10.1 Letter Agreement, dated April 18, 2017, amending the Promissory Note and Waiving a Portion of the Series A Preferred Priority Return, among Extra Space Storage LP, ESS Holdings Business Trust I, H. James Knuppe and Barbara Knuppe.

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, 2017, 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.

42

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 5, 2017	/s/ Joseph D. Margolis
	Joseph D. Margolis
	Chief Executive Officer (Principal Executive Officer)
Date: May 5, 2017	/s/ P. Scott Stubbs
	P. Scott Stubbs
	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer)

43

EX-10.1

Exhibit 10.1

April 18, 2017

Mr. H. James Knuppe and
Mrs. Barbara J. Knuppe5601 Jensen RoadCastro Valley, CA 94552-5013

Re: Letter Agreement to Amend the Promissory Note and Irrevocable Waiverof a Portion of the Series A Preferred Priority Return

Dear Sirs:

This letter agreement (this “Letter Agreement”) is being entered into by and between Extra Space Storage LP, a Delaware limited partnership (the “Partnership”), ESS Holdings Business Trust I, a Massachusetts business trust (the “General Partner”), as general partner of the Partnership, and H. James Knuppe and Barbara J. Knuppe (collectively, the “Knuppes”), as limited partners of the Partnership pursuant to the Third Amended and Restated Agreement of Limited Partnership of Extra Space Storage LP (the “Partnership Agreement”) dated as of November 22, 2013, as amended from time to time.

This Letter Agreement amends certain provisions of that certain Promissory Note dated as of June 25, 2007 made by the Knuppes in favor of the Partnership (the “Promissory Note”), as amended from time to time. Paragraph 1 of the Promissory Note, as amended, currently provides that the outstanding balance of the amount due under the Promissory Note shall bear interest at the rate of four and eighty-five one hundredths percent (4.85%) per annum (the “Interest Rate”). Paragraph 2 of the Promissory Note, as amended by the letter agreement entered into by and between the Partnership, the General Partner, and the Knuppes dated as of November 22, 2013 (the “2013 Letter Agreement”), provides the Knuppes (as “Borrowers”) shall pay to the Partnership (as “Lender”) all principal and other amounts due and unpaid under the Promissory Note on June 25, 2020 (the “Maturity Date”).

Now the Partnership, the General Partner, and the Knuppes agree to the following modifications of the Promissory Note:

1. Reduction of the Interest Rate. The reference in Paragraph 1 of the Promissory Note, as amended, to “four and eighty-five one hundredths percent (4.85%)” is hereby deleted and replaced by “two and one hundred twenty-five thousandths percent (2.125%), and subject to adjustment after nine years following the effective date of this Letter Agreement to the applicable Federal mid-term rate, compounded annually, for April 2026 as published by the U.S. Treasury Department.”

2. Extension of Maturity Date of Promissory Note. Reference to “June 25, 2017” in Paragraph 2 of the Promissory Note, as amended by the 2013 Letter Agreement, is hereby deleted and replaced by “the last to die of H. James Knuppe and Barbara J. Knuppe.”

In consideration for the above modifications to the Promissory Note and subject to the Condition Precedent defined herein, the Knuppes, in their capacity as holders of Series A Preferred Units of the Partnership, agree to the following:

1. Irrevocable Waiver of a Portion of the Series A Preferred Priority Return. Section 16.2(A) of the Partnership Agreement entitles the Knuppes, as holders of the Series A Preferred Units, to receive, at least quarterly to the extent of Available Cash, an amount equal to the Series A Preferred Priority Return. The Series A Preferred Priority Return means, with respect to each Series A Preferred Unit, an amount equal to the sum of (a) 5.00% per annum on the Series A Preferred Stated Value per Series A Preferred Unit, commencing on the date of original issuance of the Series A Preferred Units and (b) the Series A Preferred Return.

The Knuppes hereby agree to irrevocably waive the portion of the Series A Preferred Priority Return in an amount equal to 2.75% per annum on the Series A Preferred Stated Value per Series A Preferred Unit in perpetuity while the Knuppes remain holders of Series A Preferred Units of the Partnership (the “Irrevocable Waiver”). For the avoidance of doubt, from the effective date of this Letter Agreement, the Irrevocable Waiver shall entitle the Knuppes, as holders of the Series A Preferred Units, to receive quarterly distributions pursuant to Section 16.2(A) of the Partnership Agreement as a Series A Preferred Priority Return in an amount equal to the sum of (a) 2.25% per annum on the Series A Preferred Stated Value per Series A Preferred Unit and (b) the Series A Preferred Return.

2. The Series A Preferred Units Held by a Trust. The Knuppes currently hold their Series A Preferred Units in the Partnership through a revocable trust and agree that such units will continue to be held by either the current revocable trust or a successor revocable or irrevocable trust until the death of the last to die of H. James Knuppe and Barbara Knuppe, after which the Series A Preferred Units may no longer be held by a trust. The parties acknowledge that the purpose of this requirement is to ensure that the Series A Preferred Units will not be subject to the jurisdiction of a probate court upon the deaths of either H. James Knuppe or Barbara Knuppes, and this Letter Agreement shall be interpreted in order to conform with such intent.

3. Redemption of the Series A Preferred Units. It is the parties’ intention that upon the last to die of H. James Knuppe and Barbara J. Knuppe, the Series A Preferred Units may be redeemed pursuant to a Series A Preferred Redemption as described in Section 16.4(A) of the Partnership Agreement by offsetting the Series A Preferred Redemption Amount against the amount due and payable on the Promissory Note, provided that the aggregate Series A Preferred Redemption Amount equals or exceeds the amount due and payable on the Promissory Note, with the excess balance of the Series A Preferred Redemption Amount to be paid by the Partnership to the holders of the Series A Preferred Units in full satisfaction of the Series A Preferred Units. This provision does not release or alter the Knuppes’ obligations under the Promissory Note but instead provides a manner for repayment of the amounts due and payable on the Promissory Note following the last to die of the Knuppes.

As a condition for entering into this Letter Agreement (the “Condition Precedent”), the General Partner and the Knuppes (along with any related parties which own the Knuppe Properties, as defined herein) agree to execute a right of first offer agreement (the “ROFO Agreement”) within

Page 2

60 days of the effective date of this Letter Agreement whereby upon the date of death of the last to die of the Knuppes, the Partnership will be given a right of first offer to acquire from the Knuppes' estate the properties commonly referred to as: i) AAAAA Rent-A-Space-Moraga, Ltd. Limited Partnership, ii) AAAAA Rent-A-Space, Foster City, Ltd. Limited Partnership, and iii) AAAAA Rent-A-Space, Maui Limited Partnership (“Knuppe Properties”).

Capitalized terms used herein and not otherwise defined shall have the meanings given to them in the Partnership Agreement.

This Letter Agreement may be executed in any number of counterparts with the same effect as if all the signatories had signed the same document. All counterparts shall be construed together and shall constitute one agreement.

***Remainder of this page left intentionally blank***

Page 3

If the foregoing meets with your approval, kindly countersign this Letter Agreement below to indicate your acceptance and agreement to its terms.

Sincerely,

EXTRA SPACE STORAGE LP, a Delaware limited partnership

By: ESS HOLDINGS BUSINESS TRUST I, a Massachusetts business trust, its sole general partner

By:	/s/ Gwyn G McNeal
Name:	Gwyn G McNeal
Title:	Trustee

Accepted and agreed as of the date first above written.

ESS HOLDINGS BUSINESS TRUST I, a Massachusetts business trust

By:	/s/ Gwyn G McNeal
Name:	Gwyn G McNeal
Title:	Trustee

H. JAMES KNUPPE

/s/ H. James Knuppe

BARBARA J. KNUPPE

/s/ Barbara J. Knuppe

Page 4

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Joseph D. Margolis, 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 5, 2017	By:	/s/ Joseph D. Margolis
	Name:	Joseph D. Margolis
	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 5, 2017	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, 2017 (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/ Joseph D. Margolis
Name:	Joseph D. Margolis
Title:	Chief Executive Officer
Date:	May 5, 2017

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, 2017 (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 5, 2017

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Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	May 01, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2017
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		125,964,453

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Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets:
Real estate assets, net	$ 6,770,593	$ 6,770,447
Investments in unconsolidated real estate ventures	79,385	79,570
Cash and cash equivalents	29,311	43,858
Restricted cash	12,231	13,884
Receivables from related parties and affiliated real estate joint ventures	6,251	16,611
Other assets, net	136,586	167,076
Total assets	7,034,357	7,091,446
Liabilities, Noncontrolling Interests and Equity:
Notes payable, net	3,198,870	3,213,588
Exchangeable senior notes, net	612,233	610,314
Notes payable to trusts, net	117,352	117,321
Revolving lines of credit	363,000	365,000
Accounts payable and accrued expenses	77,106	101,388
Other liabilities	79,981	87,669
Total liabilities	4,448,542	4,495,280
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	0	0
Common stock, $0.01 par value, 500,000,000 shares authorized, 125,912,164 and 125,881,460 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	1,259	1,259
Additional paid-in capital	2,567,228	2,566,120
Accumulated other comprehensive income	22,816	16,770
Accumulated deficit	(355,187)	(339,257)
Total Extra Space Storage Inc. stockholders' equity	2,236,116	2,244,892
Noncontrolling interest represented by Preferred Operating Partnership units, net of $120,230 notes receivable	147,823	147,920
Noncontrolling interests in Operating Partnership	201,876	203,354
Total noncontrolling interests and equity	2,585,815	2,596,166
Total liabilities, noncontrolling interests and equity	$ 7,034,357	$ 7,091,446

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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 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 (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	125,912,164	125,881,460
Common stock, shares outstanding	125,912,164	125,881,460
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, 2017	Mar. 31, 2016
Revenues:
Property rental	$ 231,493	$ 199,488
Tenant reinsurance	22,855	20,555
Management fees and other income	8,660	9,360
Total revenues	263,008	229,403
Expenses:
Property operations	66,645	61,112
Tenant reinsurance	3,920	4,311
Acquisition related costs and other	0	4,053
General and administrative	18,808	23,402
Depreciation and amortization	49,432	42,897
Total expenses	138,805	135,775
Income from operations	124,203	93,628
Loss on earnout from prior acquisition	0	(1,544)
Interest expense	(35,970)	(31,359)
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	(1,269)	(1,233)
Interest income	1,102	1,714
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	89,279	62,419
Equity in earnings of unconsolidated real estate ventures	3,579	2,830
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partner's interest	0	26,923
Income tax expense	(3,124)	(2,765)
Net income	89,734	89,407
Net income allocated to Preferred Operating Partnership noncontrolling interests	(3,951)	(3,180)
Net income allocated to Operating Partnership and other noncontrolling interests	(3,501)	(3,635)
Net income attributable to common stockholders	$ 82,282	$ 82,592
Earnings per common share
Basic (in dollars per share)	$ 0.65	$ 0.66
Diluted (in dollars per share)	$ 0.64	$ 0.66
Weighted average number of shares
Basic (in shares)	125,605,403	124,754,174
Diluted (in shares)	132,618,644	131,956,094
Cash dividends paid per common share (in dollars per share)	$ 0.78	$ 0.59

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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 89,734	$ 89,407
Other comprehensive income (loss):
Change in fair value of interest rate swaps	6,334	(31,148)
Total comprehensive income	96,068	58,259
Less: comprehensive income attributable to noncontrolling interests	7,740	5,254
Comprehensive income attributable to common stockholders	$ 88,328	$ 53,005

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Condensed Consolidated Statement of Noncontrolling Interests and Equity - 3 months ended Mar. 31, 2017 - 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]	Par Value [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]
Balance, beginning of period at Dec. 31, 2016	$ 2,596,166	$ 14,385	$ 41,902	$ 10,730	$ 80,903	$ 203,354	$ 1,259	$ 2,566,120	$ 16,770	$ (339,257)
Balance, beginning of period (in shares) at Dec. 31, 2016	125,881,460						125,881,460
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock grants issued	$ 0						$ 0
Restricted stock grants issued (in shares)							31,179
Restricted stock grants canceled (in shares)							(475)
Compensation expense related to stock-based awards	1,990		0	0	0	0		1,990	0	0
Redemption of Operating Partnership units for cash	(1,754)					(872)		(882)
Redemption of Operating Partnership units for cash (in shares)							0
Net income	89,734	1,818	629	676	828	3,501				82,282
Other comprehensive income	6,334	39				249			6,046
Distributions to Operating Partnership units held by noncontrolling interests	(8,443)	(1,954)	(629)	(676)	(828)	(4,356)
Dividends paid on common stock at $0.78 per share	(98,212)									(98,212)
Balance, end of period at Mar. 31, 2017	$ 2,585,815	$ 14,288	$ 41,902	$ 10,730	$ 80,903	$ 201,876	$ 1,259	$ 2,567,228	$ 22,816	$ (355,187)
Balance, end of period (in shares) at Mar. 31, 2017	125,912,164						125,912,164

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Condensed Consolidated Statement of Noncontrolling Interests and Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Stockholders' Equity [Abstract]
Dividends paid on common stock, per share (in dollars per share)	$ 0.78	$ 0.59

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 89,734	$ 89,407
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	49,432	42,897
Amortization of deferred financing costs	3,103	2,823
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	1,269	1,233
Non-cash interest expense related to amortization of premium on notes payable	0	(354)
Compensation expense related to stock-based awards	1,990	1,710
Gain on sale of real estate assets and purchase of joint venture partner's interest	0	(26,923)
Loss on earnout from prior acquisition	0	(1,544)
Distributions from unconsolidated real estate ventures in excess of earnings	1,123	998
Changes in operating assets and liabilities:
Receivables from related parties and affiliated real estate joint ventures	(1,438)	(2,878)
Other assets	4,336	(5,276)
Accounts payable and accrued expenses	(30,069)	(5,642)
Other liabilities	(6,359)	(985)
Net Cash Provided by (Used in) Operating Activities	113,121	95,466
Cash flows from investing activities:
Acquisition of real estate assets	(39,136)	(234,820)
Development and redevelopment of real estate assets	(5,246)	(6,543)
Change in restricted cash	1,653	(1,265)
Investment in unconsolidated real estate ventures	(1,519)	(4,794)
Return of investment in unconsolidated real estate ventures	581	318
Purchase/issuance of notes receivable	0	(10,656)
Principal payments received from notes receivable	44,869	0
Purchase of equipment and fixtures	(1,292)	(908)
Net Cash Provided by (Used in) Investing Activities	(90)	(258,668)
Cash flows from financing activities:
Proceeds from the sale of common stock, net of offering costs	0	73,574
Repurchase of exchangeable senior notes	0	(19,639)
Proceeds from notes payable and revolving lines of credit	169,000	195,976
Principal payments on notes payable and revolving lines of credit	(187,916)	(32,859)
Deferred financing costs	(253)	(1,286)
Net proceeds from exercise of stock options	0	13
Proceeds from termination of interest rate cap	0	1,650
Redemption of Operating Partnership units held by noncontrolling interests	(1,754)	0
Dividends paid on common stock	(98,212)	(73,827)
Distributions to noncontrolling interests	(8,443)	(6,446)
Net cash provided by (used in) financing activities	(127,578)	137,156
Net decrease in cash and cash equivalents	(14,547)	(26,046)
Cash and cash equivalents, beginning of the period	43,858	75,799
Cash and cash equivalents, end of the period	29,311	49,753
Supplemental schedule of cash flow information
Interest paid	37,570	24,873
Income taxes paid	5,059	4,835
Redemption of Operating Partnership units held by noncontrolling interests for common stock
Noncontrolling interests in Operating Partnership	0	(12)
Common stock and paid-in capital	0	12
Tax effect from vesting of restricted stock grants and option exercises
Other assets	0	272
Additional paid-in capital	0	(272)
Accrued construction costs and capital expenditures
Acquisition of real estate assets	4,797	0
Development and redevelopment of real estate assets	990	0
Other liabilities	(5,787)	0
Distribution of real estate from investments in unconsolidated real estate ventures
Real estate assets, net	0	17,261
Investments in unconsolidated real estate ventures	$ 0	$ (17,261)

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Organization

3 Months Ended

Mar. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

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, 2017, the Company had direct and indirect equity interests in 1,020 stores. In addition, the Company managed 421 stores for third parties, bringing the total number of stores which it owns and/or manages to 1,441. These stores are located in 38 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 and developing stores.

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Basis of Presentation

3 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

Basis of Presentation

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, 2017, are not necessarily indicative of results that may be expected for the year ending December 31, 2017. The condensed consolidated balance sheet as of December 31, 2016 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, 2016, 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. The new standard will become effective for annual and interim periods beginning after December 15, 2017 with early adoption permitted. The Company has determined that its property rental revenue and tenant reinsurance revenue will not be subject to the guidance in ASU 2014-09, as they qualify as lease contracts and insurance contracts, which are excluded from its scope. The Company's management fee revenue will be included in the scope of the standard. However, based on the Company's initial assessment, it appears that revenue recognized under the standard will not differ materially from revenue recognized under existing guidance. The Company continues to assess the potential impacts of ASU 2014-09. The Company anticipates adopting the standard using the modified retrospective transition method as of January 1, 2018.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which modifies the accounting for leases, intending to increase transparency and comparability of organizations by requiring balance sheet presentation of leased assets and increased financial statement disclosure of leasing arrangements. ASU 2016-02 will require entities to recognize a liability for their lease obligations and a corresponding asset representing the right to use the underlying asset over the lease term. Lease obligations are to be measured at their present value and accounted for using the effective interest method. The accounting for the leased asset will differ slightly depending on whether the agreement is deemed to be a financing or operating lease. For financing leases, the leased asset is depreciated on a straight-line basis and depreciation expense is recorded separately from the interest expense in the statements of operations, resulting in higher expense in the earlier part of the lease term. For operating leases, the depreciation and interest expense components are combined, recognized evenly over the term of the lease, and presented as a reduction to operating income. ASU 2016-02 requires that assets and liabilities be presented or disclosed separately, and requires additional disclosure of certain qualitative and quantitative information related to these lease agreements. ASU 2016-02 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 2016-05, "Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships." ASU 2016-05 clarifies that a change in the counterparty to a derivative instrument that has been designated as a hedging instrument does not, in and of itself, require re-designation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The Company adopted this guidance on January 1, 2017. The adoption of ASU 2016-05 did not have a material impact 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. The Company adopted this guidance prospectively on January 1, 2017, and prior periods have not been adjusted. As a result of the adoption of this guidance, the Company no longer presents the tax effects from vesting of restricted stock grants and stock option exercises on its condensed consolidated statement of noncontrolling interests and equity.

In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments." ASU 2016-15 provides guidance on several specific cash flow issues, including the classification of debt prepayment or debt extinguishment costs, contingent consideration payments, and distributions received from equity method investees. This guidance is effective for fiscal years beginning after December 15, 2017. The Company is currently evaluating the new guidance to determine the impact it may have on its consolidated financial statements.

In October 2016, the FASB issued ASU 2016-18, "Statement of Cash Flows (Topic 230)," which requires that a statement of cash flows explains the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance is effective for fiscal years beginning after December 15, 2017, and 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.

In January 2017, the FASB issued ASU 2017-01, "Business Combinations (Topic 805): Clarifying the Definition of a Business," which provides guidance on whether transactions should be accounted for as acquisitions or disposals of assets or businesses. Specifically, when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or group of similar identifiable assets, the set of assets is not a business. Additionally, ASU 2017-01 also provides other guidance providing a more robust framework to use in determining whether a set of assets and activities is a business. This guidance is effective for annual periods beginning after December 15, 2017. Early adoption is permitted for transactions for which the acquisition or disposition date occurs before the issuance date or effective date of the amendments, only when the transaction has not been reported in financial statements that have been issued. The Company adopted ASU 2017-01 for new acquisitions beginning on January 1, 2017. The costs related to the acquisitions of stores that qualify as asset acquisitions will be capitalized as part of the purchase.

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Fair Value Disclosures

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Disclosures

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, 2017, 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, 2017, aggregated by the level in the fair value hierarchy within which those measurements fall.

				Fair Value Measurements at Reporting Date Using
Description	March 31, 2017			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	$	28,744		$	—	$	28,744		$	—
Other liabilities - Cash Flow Hedge Swap Agreements	$	(1,073	)	$	—	$	(1,073	)	$	—

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, 2017 or December 31, 2016.

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, 2017, the Company had one parcel of undeveloped land and 36 operating 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 relative 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, for those qualifying as asset acquisitions, are capitalized as a component of the cost of the assets acquired.

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, 2017 and December 31, 2016 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, 2017				December 31, 2016
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	124,837	$	120,230	$	125,642	$	120,230
Fixed rate notes receivable	$	21,649	$	20,608	$	53,450	$	52,201
Fixed rate notes payable and notes payable to trusts	$	2,329,582	$	2,360,128	$	2,404,996	$	2,417,558
Exchangeable senior notes	$	691,554	$	638,170	$	706,827	$	638,170

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Earnings Per Common Share

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Earnings Per Common Share

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, 2017 and 2016, options to purchase approximately 103,854 and 67,812 shares of common stock, respectively, were excluded from the computation of earnings per share as their effect would have been anti-dilutive.

For the purposes of computing the diluted impact of the potential exchange of the Preferred Operating Partnership 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 Preferred Operating Partnership units by the average share price for the period presented. The average share price for the three months ended March 31, 2017 and 2016 was $75.47 and $86.91, respectively. 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.

	For the Three Months Ended March 31,
	2017	2016
	Equivalent Shares (if converted)	Equivalent Shares (if converted)
Series B Units	555,216	482,133
Series C Units	392,727	341,032
Series D Units	1,071,983	157,747
	2,019,926	980,912

The Operating Partnership had $63,170 of its 2.375% Exchangeable Senior Notes due 2033 (the “2013 Notes”) issued and outstanding as of March 31, 2017. 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 $53.81 per share as of March 31, 2017, 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, 2017. 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 $94.47 per share as of March 31, 2017, 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, 2017 and 2016, 336,848 and 441,598 shares, respectively, related to the 2013 Notes were included in the computation for diluted earnings per share. For the three months ended March 31, 2017 and 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 these periods.

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. Accordingly, the number of shares included in the computation for diluted earnings per share related to the Series A Units is equal to the number of Series A Units outstanding, with no additional shares included related to the fixed $115,000 amount.

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

	For the Three Months Ended March 31,
	2017			2016
Net income attributable to common stockholders	$	82,282		$	82,592
Earnings and dividends allocated to participating securities	(197		)	(165		)
Earnings for basic computations	82,085			82,427
Income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units) and Operating Partnership	4,049			5,474
Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units)	(1,271		)	(1,271		)
Net income for diluted computations	$	84,863		$	86,630
Weighted average common shares outstanding:
Average number of common shares outstanding - basic	125,605,403			124,754,174
OP Units	5,596,191			5,621,470
Series A Units	875,480			875,480
Shares related to exchangeable senior notes and dilutive stock options	541,570			704,970
Average number of common shares outstanding - diluted	132,618,644			131,956,094
Earnings per common share
Basic	$	0.65		$	0.66
Diluted	$	0.64		$	0.66

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Store Acquisitions

3 Months Ended

Mar. 31, 2017

Business Combinations [Abstract]

Store Acquisitions

STORE ACQUISITIONS

The following table shows the Company’s acquisitions of operating stores for the three months ended March 31, 2017. The table excludes purchases of raw land or improvements made to existing assets.

			Consideration Paid				Total
Property Location	Number of Stores	Date of Acquisition	Cash Paid		Net Liabilities/(Assets) Assumed		Real estate assets
Illinois	1	2/1/2017	$	9,020	$	8	$	9,028
Georgia	1	1/6/2017	16,521		7		16,528
2017 Totals	2		$	25,541	$	15	$	25,556

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Variable Interests

3 Months Ended

Mar. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Variable Interests

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, 2017:

	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	(2,238		)
	$	117,352

The Company had no consolidated VIEs during the three months ended March 31, 2017.

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Derivatives

3 Months Ended

Mar. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

DERIVATIVES

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

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, 2017 and 2016, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. In the coming 12 months, the Company estimates that an additional $4,209 will be reclassified as an increase to interest expense.

The Company held 28 derivative financial instruments which had a total combined notional amount of $2,052,010 as of March 31, 2017.

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, 2017			December 31, 2016
Derivatives designated as hedging instruments:	Fair Value
Other assets	$	28,744		$	23,844
Other liabilities	$	(1,073	)	$	(2,447	)

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:

	Gain (loss) recognized in OCI For the Three Months Ended March 31,					Location of amounts reclassified from OCI into income	Gain (loss) reclassified from OCI For the Three Months Ended March 31,
Type	2017		2016				2017			2016
Swap Agreements	$	3,006	$	(34,960	)	Interest expense	$	(3,330	)	$	(4,454	)

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, 2017, 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 $1,361. As of March 31, 2017, the Company had not posted any collateral related to these agreements. If the Company had breached any of these provisions as of March 31, 2017, it could have been required to settle its obligations under the agreements at their termination value of $1,361, including accrued interest.

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Exchangeable Senior Notes

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Exchangeable Senior Notes

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 2.0% 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 2015 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, 2017 was approximately 10.58 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, 2017 was approximately 18.58 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 and the 2015 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, 2017. Therefore, holders of the 2013 Notes may elect to exchange such notes during the quarter ending June 30, 2017. The price of the Company’s common stock did not exceed 130% of the exchange price for the required time period for the 2015 Notes during the quarter ended March 31, 2017.

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 approximated 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, 2017			December 31, 2016
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	$	63,170		$	63,170
Principal amount of liability component - 2015 Notes	575,000			575,000
Unamortized discount - equity component - 2013 Notes	(992		)	(1,187		)
Unamortized discount - equity component - 2015 Notes	(16,281		)	(17,355		)
Unamortized cash discount - 2013 Notes	(234		)	(281		)
Unamortized debt issuance costs	(8,430		)	(9,033		)
Net carrying amount of liability components	$	612,233		$	610,314

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,
	2017		2016
Contractual interest	$	4,867	$	4,882
Amortization of discount	1,269		1,233
Total interest expense recognized	$	6,136	$	6,115

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 repurchases 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, 2017

Stockholders' Equity Note [Abstract]

Stockholders' Equity

STOCKHOLDERS’ EQUITY

On May 6, 2016, the Company filed its current $400,000 "at the market" equity program with the Securities and Exchange Commission using a new shelf registration statement on Form S-3, and entered into separate equity distribution agreements with five sales agents. Under the terms of the current equity distribution agreements, the Company may from time to time offer and sell shares of common stock, up to the aggregate offering price of $400,000, through its sales agents.

During the quarter ended March 31, 2017, the Company did not issue any shares and had $349,375 available for issuance under the existing equity distribution agreements.

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Noncontrolling Interest Represented by Preferred Operating Partnership Units

3 Months Ended

Mar. 31, 2017

Preferred Operating Partnership Units [Member]

Noncontrolling Interest [Line Items]

Noncontrolling Interest Represented by Preferred Operating Partnership Units

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 5.0% 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

The Company completed the purchase of twelve stores in California 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. 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 are convertible into OP Units at the option of the holder 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

On November 8, 2016, the Operating Partnership completed the acquisition of a store located in Illinois. This store was acquired in exchange for 486,244 Series D-4 Preferred Units ("D-4 Units") valued at $12,156.

On June 10, 2016, the Operating Partnership completed the acquisition of four stores located in Illinois. These stores were acquired in exchange for 2,201,467 Series D-3 Preferred Units ("D-3 Units") valued at $55,037.

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-1 Preferred Units ("D-1 Units," and together with the D-3 Units and D-4 Units, "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 $80,903. Holders of the Series D Units receive distributions at an annual rate between 3.5% to 5.0%. These distributions are cumulative. The Series D Units become redeemable at the option of the holder on the first anniversary of the date of issuance, which redemption obligation may be satisfied at the Company’s option in cash or shares of its common stock. In addition, the D-3 Units are convertible into OP Units at the option of the holder until the tenth anniversary of the date of issuance, with the number of OP Units to be issued equal to $25.00 per D-3 Unit, divided by the value of a share of common stock as of the exchange date.

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Noncontrolling Interest in Operating Partnership

3 Months Ended

Mar. 31, 2017

Common Operating Partnership [Member]

Noncontrolling Interest [Line Items]

Noncontrolling Interest in Operating Partnership

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 91.2% ownership interest in the Operating Partnership as of March 31, 2017. The remaining ownership interests in the Operating Partnership (including Preferred Operating Partnership units) of 8.8% 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, 2017 was $74.84 and there were 5,584,242 OP Units outstanding. Assuming that all of the OP Unit holders exercised their right to redeem all of their OP Units on March 31, 2017 and the Company elected to pay the OP Unit holders cash, the Company would have paid $417,925 in cash consideration to redeem the units.

During the quarter, 23,796 OP Units were redeemed for $1,754 in cash.

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

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

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Other Noncontrolling Interests

3 Months Ended

Mar. 31, 2017

Other Noncontrolling Interests [Member]

Noncontrolling Interest [Line Items]

Other Noncontrolling Interests

OTHER NONCONTROLLING INTERESTS

Other noncontrolling interests represent the ownership interests of a third party in one consolidated joint venture as of March 31, 2017. This joint venture owns an operating store in Texas. The voting interests of the third-party owner are 20.0%.

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Equity in Earnings of Unconsolidated Real Estate Ventures - Gain on Sale of Real Estate and Purchase of Joint Venture Partner's Interest

3 Months Ended

Mar. 31, 2017

Equity Method Investments and Joint Ventures [Abstract]

Equity in Earnings of Unconsolidated Real Estate Ventures - Gain on Sale of Real Estate and Purchase of Joint Venture Partner's Interest

EQUITY IN EARNINGS OF UNCONSOLIDATED REAL ESTATE VENTURES—GAIN ON SALE OF REAL ESTATE AND PURCHASE OF JOINT VENTURE PARTNER'S INTEREST

On February 2, 2016, the Company acquired six stores from its VRS Self Storage LLC joint venture (“VRS”) in a step acquisition. These stores are located in Florida, Maryland, Nevada, New York, and Tennessee. The Company owns 45.04% of VRS, with the other 54.96% owned by affiliates of Prudential Global Investment Management ("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 stores 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 during the three months ended March 31, 2016 as a result of remeasuring 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 partner's interest on the Company’s condensed consolidated statements of operations. The Company recorded fixed assets related to this acquisition of $98,082, which includes total cash paid, the investment in ESP 122, and the step acquisition gain, less net assets acquired.

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Segment Information

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Segment Information

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, 2017		December 31, 2016
Balance Sheet
Investment in unconsolidated real estate ventures
Rental operations	$	79,385	$	79,570
Total assets
Rental operations	$	6,729,670	$	6,731,292
Tenant reinsurance	33,611		44,524
Property management, acquisition and development	271,076		315,630
	$	7,034,357	$	7,091,446

	For the Three Months Ended March 31,
	2017			2016
Statement of Operations
Total revenues
Rental operations	$	231,493		$	199,488
Tenant reinsurance	22,855			20,555
Property management, acquisition and development	8,660			9,360
	263,008			229,403
Operating expenses, including depreciation and amortization
Rental operations	115,357			101,698
Tenant reinsurance	3,920			4,311
Property management, acquisition and development	19,528			29,766
	138,805			135,775
Income (loss) from operations
Rental operations	116,136			97,790
Tenant reinsurance	18,935			16,244
Property management, acquisition and development	(10,868		)	(20,406		)
	124,203			93,628
Loss on earnout from prior acquisition
Property management, acquisition and development	—			(1,544		)
Interest expense
Rental operations	(34,821		)	(30,565		)
Property management, acquisition and development	(1,149		)	(794		)
	(35,970		)	(31,359		)
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes
Property management, acquisition and development	(1,269		)	(1,233		)
Interest income
Property management, acquisition and development	1,102			1,714
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	3,579			2,830
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partner's interest
Property management, acquisition and development	—			26,923
Income tax (expense) benefit
Rental operations	(463		)	(845		)
Tenant reinsurance	(3,263		)	(2,663		)
Property management, acquisition and development	602			743
	(3,124		)	(2,765		)
Net income (loss)
Rental operations	84,431			69,210
Tenant reinsurance	15,672			13,581
Property management, acquisition and development	(10,369		)	6,616
	$	89,734		$	89,407

	For the Three Months Ended March 31,
	2017			2016
Depreciation and amortization expense
Rental operations	$	48,712		$	40,586
Property management, acquisition and development	720			2,311
	$	49,432		$	42,897
Statement of Cash Flows
Acquisition of real estate assets
Property management, acquisition and development	$	(39,136	)	$	(234,820	)
Development and redevelopment of real estate assets
Property management, acquisition and development	$	(5,246	)	$	(6,543	)

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

COMMITMENTS AND CONTINGENCIES

As of March 31, 2017, 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 has a liability of $5,600 at March 31, 2017, which is included in other liabilities on the condensed consolidated balance sheet.

As of March 31, 2017, the Company was under agreement to acquire two operating stores and 13 stores to be acquired upon the completion of construction. The total purchase price of all stores with commitments was $165,581. Of these stores, six are scheduled to close in 2017. The remaining stores will close upon completion of construction, expected to occur on various dates in 2018 and 2019. Additionally, the Company is under agreement to acquire 23 stores with joint venture partners, for a total purchase price of $141,887. Eleven of these stores are scheduled to close in 2017, while the remaining twelve stores are expected to close in 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 stores, the activities of its tenants and other environmental conditions of which the Company is unaware with respect to its stores could result in future material environmental liabilities.

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Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2017

Accounting Policies [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. The new standard will become effective for annual and interim periods beginning after December 15, 2017 with early adoption permitted. The Company has determined that its property rental revenue and tenant reinsurance revenue will not be subject to the guidance in ASU 2014-09, as they qualify as lease contracts and insurance contracts, which are excluded from its scope. The Company's management fee revenue will be included in the scope of the standard. However, based on the Company's initial assessment, it appears that revenue recognized under the standard will not differ materially from revenue recognized under existing guidance. The Company continues to assess the potential impacts of ASU 2014-09. The Company anticipates adopting the standard using the modified retrospective transition method as of January 1, 2018.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which modifies the accounting for leases, intending to increase transparency and comparability of organizations by requiring balance sheet presentation of leased assets and increased financial statement disclosure of leasing arrangements. ASU 2016-02 will require entities to recognize a liability for their lease obligations and a corresponding asset representing the right to use the underlying asset over the lease term. Lease obligations are to be measured at their present value and accounted for using the effective interest method. The accounting for the leased asset will differ slightly depending on whether the agreement is deemed to be a financing or operating lease. For financing leases, the leased asset is depreciated on a straight-line basis and depreciation expense is recorded separately from the interest expense in the statements of operations, resulting in higher expense in the earlier part of the lease term. For operating leases, the depreciation and interest expense components are combined, recognized evenly over the term of the lease, and presented as a reduction to operating income. ASU 2016-02 requires that assets and liabilities be presented or disclosed separately, and requires additional disclosure of certain qualitative and quantitative information related to these lease agreements. ASU 2016-02 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 2016-05, "Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships." ASU 2016-05 clarifies that a change in the counterparty to a derivative instrument that has been designated as a hedging instrument does not, in and of itself, require re-designation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The Company adopted this guidance on January 1, 2017. The adoption of ASU 2016-05 did not have a material impact 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. The Company adopted this guidance prospectively on January 1, 2017, and prior periods have not been adjusted. As a result of the adoption of this guidance, the Company no longer presents the tax effects from vesting of restricted stock grants and stock option exercises on its condensed consolidated statement of noncontrolling interests and equity.

In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments." ASU 2016-15 provides guidance on several specific cash flow issues, including the classification of debt prepayment or debt extinguishment costs, contingent consideration payments, and distributions received from equity method investees. This guidance is effective for fiscal years beginning after December 15, 2017. The Company is currently evaluating the new guidance to determine the impact it may have on its consolidated financial statements.

In October 2016, the FASB issued ASU 2016-18, "Statement of Cash Flows (Topic 230)," which requires that a statement of cash flows explains the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance is effective for fiscal years beginning after December 15, 2017, and 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

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, 2017, the Company had one parcel of undeveloped land and 36 operating 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 relative 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, for those qualifying as asset acquisitions, are capitalized as a component of the cost of the assets acquired.

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, 2017 and December 31, 2016 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.

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, 2017, 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.

Earnings Per Common Share

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.

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 approximated 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, 2017

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, 2017, aggregated by the level in the fair value hierarchy within which those measurements fall.

				Fair Value Measurements at Reporting Date Using
Description	March 31, 2017			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	$	28,744		$	—	$	28,744		$	—
Other liabilities - Cash Flow Hedge Swap Agreements	$	(1,073	)	$	—	$	(1,073	)	$	—

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, 2017				December 31, 2016
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes receivable from Preferred Operating Partnership unit holders	$	124,837	$	120,230	$	125,642	$	120,230
Fixed rate notes receivable	$	21,649	$	20,608	$	53,450	$	52,201
Fixed rate notes payable and notes payable to trusts	$	2,329,582	$	2,360,128	$	2,404,996	$	2,417,558
Exchangeable senior notes	$	691,554	$	638,170	$	706,827	$	638,170

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Earnings Per Common Share (Tables)

3 Months Ended

Mar. 31, 2017

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.

	For the Three Months Ended March 31,
	2017	2016
	Equivalent Shares (if converted)	Equivalent Shares (if converted)
Series B Units	555,216	482,133
Series C Units	392,727	341,032
Series D Units	1,071,983	157,747
	2,019,926	980,912

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,
	2017			2016
Net income attributable to common stockholders	$	82,282		$	82,592
Earnings and dividends allocated to participating securities	(197		)	(165		)
Earnings for basic computations	82,085			82,427
Income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units) and Operating Partnership	4,049			5,474
Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units)	(1,271		)	(1,271		)
Net income for diluted computations	$	84,863		$	86,630
Weighted average common shares outstanding:
Average number of common shares outstanding - basic	125,605,403			124,754,174
OP Units	5,596,191			5,621,470
Series A Units	875,480			875,480
Shares related to exchangeable senior notes and dilutive stock options	541,570			704,970
Average number of common shares outstanding - diluted	132,618,644			131,956,094
Earnings per common share
Basic	$	0.65		$	0.66
Diluted	$	0.64		$	0.66

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Store Acquisitions (Tables)

3 Months Ended

Mar. 31, 2017

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, 2017. The table excludes purchases of raw land or improvements made to existing assets.

			Consideration Paid				Total
Property Location	Number of Stores	Date of Acquisition	Cash Paid		Net Liabilities/(Assets) Assumed		Real estate assets
Illinois	1	2/1/2017	$	9,020	$	8	$	9,028
Georgia	1	1/6/2017	16,521		7		16,528
2017 Totals	2		$	25,541	$	15	$	25,556

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Variable Interests (Tables)

3 Months Ended

Mar. 31, 2017

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, 2017:

	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	(2,238		)
	$	117,352

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Derivatives (Tables)

3 Months Ended

Mar. 31, 2017

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, 2017			December 31, 2016
Derivatives designated as hedging instruments:	Fair Value
Other assets	$	28,744		$	23,844
Other liabilities	$	(1,073	)	$	(2,447	)

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

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:

	Gain (loss) recognized in OCI For the Three Months Ended March 31,					Location of amounts reclassified from OCI into income	Gain (loss) reclassified from OCI For the Three Months Ended March 31,
Type	2017		2016				2017			2016
Swap Agreements	$	3,006	$	(34,960	)	Interest expense	$	(3,330	)	$	(4,454	)

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Exchangeable Senior Notes (Tables)

3 Months Ended

Mar. 31, 2017

Debt Disclosure [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, 2017			December 31, 2016
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	$	63,170		$	63,170
Principal amount of liability component - 2015 Notes	575,000			575,000
Unamortized discount - equity component - 2013 Notes	(992		)	(1,187		)
Unamortized discount - equity component - 2015 Notes	(16,281		)	(17,355		)
Unamortized cash discount - 2013 Notes	(234		)	(281		)
Unamortized debt issuance costs	(8,430		)	(9,033		)
Net carrying amount of liability components	$	612,233		$	610,314

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,
	2017		2016
Contractual interest	$	4,867	$	4,882
Amortization of discount	1,269		1,233
Total interest expense recognized	$	6,136	$	6,115

Summary of Repurchase of Debt

Information about the repurchases 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, 2017

Segment Reporting [Abstract]

Schedule of Financial Information of Business Segments

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

	March 31, 2017		December 31, 2016
Balance Sheet
Investment in unconsolidated real estate ventures
Rental operations	$	79,385	$	79,570
Total assets
Rental operations	$	6,729,670	$	6,731,292
Tenant reinsurance	33,611		44,524
Property management, acquisition and development	271,076		315,630
	$	7,034,357	$	7,091,446

	For the Three Months Ended March 31,
	2017			2016
Statement of Operations
Total revenues
Rental operations	$	231,493		$	199,488
Tenant reinsurance	22,855			20,555
Property management, acquisition and development	8,660			9,360
	263,008			229,403
Operating expenses, including depreciation and amortization
Rental operations	115,357			101,698
Tenant reinsurance	3,920			4,311
Property management, acquisition and development	19,528			29,766
	138,805			135,775
Income (loss) from operations
Rental operations	116,136			97,790
Tenant reinsurance	18,935			16,244
Property management, acquisition and development	(10,868		)	(20,406		)
	124,203			93,628
Loss on earnout from prior acquisition
Property management, acquisition and development	—			(1,544		)
Interest expense
Rental operations	(34,821		)	(30,565		)
Property management, acquisition and development	(1,149		)	(794		)
	(35,970		)	(31,359		)
Non-cash interest expense related to the amortization of discount on equity component of exchangeable senior notes
Property management, acquisition and development	(1,269		)	(1,233		)
Interest income
Property management, acquisition and development	1,102			1,714
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	3,579			2,830
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partner's interest
Property management, acquisition and development	—			26,923
Income tax (expense) benefit
Rental operations	(463		)	(845		)
Tenant reinsurance	(3,263		)	(2,663		)
Property management, acquisition and development	602			743
	(3,124		)	(2,765		)
Net income (loss)
Rental operations	84,431			69,210
Tenant reinsurance	15,672			13,581
Property management, acquisition and development	(10,369		)	6,616
	$	89,734		$	89,407

	For the Three Months Ended March 31,
	2017			2016
Depreciation and amortization expense
Rental operations	$	48,712		$	40,586
Property management, acquisition and development	720			2,311
	$	49,432		$	42,897
Statement of Cash Flows
Acquisition of real estate assets
Property management, acquisition and development	$	(39,136	)	$	(234,820	)
Development and redevelopment of real estate assets
Property management, acquisition and development	$	(5,246	)	$	(6,543	)

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Organization - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 segment store state
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of operating storage facilities in which the entity has equity interests (in stores)	1,020
Number of stores owned by franchisees and third parties	421
Number of operating stores owned and/or managed	1,441
Number of states in which operating storage facilities are located | state	38
Number of reportable segments | segment	3
Rental Revenue [Member] | Customer Concentration Risk [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Percentage of rental income accounted for by any single tenant (no more than)	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, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets - Cash Flow Hedge Swap Agreements	$ 28,744
Other liabilities - Cash Flow Hedge Swap Agreements	(1,073)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets - Cash Flow Hedge Swap Agreements	0
Other liabilities - Cash Flow Hedge Swap Agreements	0
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	28,744
Other liabilities - Cash Flow Hedge Swap Agreements	(1,073)
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets - Cash Flow Hedge Swap Agreements	0
Other liabilities - Cash Flow Hedge Swap Agreements	$ 0

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Fair Value Disclosures - Schedule of Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
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	3,198,870	3,213,588
Exchangeable senior notes	612,233	610,314
Fair Value [Member]
Fair Value of Financial Instruments [Line Items]
Notes receivable from Preferred Operating Partnership unit holders	124,837	125,642
Fixed rate notes receivable	21,649	53,450
Fixed rate notes payable and notes payable to trusts	2,329,582	2,404,996
Exchangeable senior notes	691,554	706,827
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	20,608	52,201
Fixed rate notes payable and notes payable to trusts	2,360,128	2,417,558
Exchangeable senior notes	$ 638,170	$ 638,170

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Fair Value Disclosures - Additional Information (Detail)	Mar. 31, 2017 land_parcel store
Fair Value Disclosures [Abstract]
Number of parcels of undeveloped land classified as held for sale | land_parcel	1
Number of operating stores held for sale | store	36

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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, 2017	Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equivalent shares (if converted) (in shares)	2,019,926	980,912
Series B Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equivalent shares (if converted) (in shares)	555,216	482,133
Series C Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equivalent shares (if converted) (in shares)	392,727	341,032
Series D Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equivalent shares (if converted) (in shares)	1,071,983	157,747

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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, 2017	Mar. 31, 2016
Earnings Per Share [Line Items]
Net income attributable to common stockholders	$ 82,282	$ 82,592
Earnings and dividends allocated to participating securities	(197)	(165)
Earnings for basic computations	82,085	82,427
Income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units) and Operating Partnership	4,049	5,474
Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units)	(1,271)	(1,271)
Net income for diluted computations	$ 84,863	$ 86,630
Weighted average common shares outstanding:
Average number of common shares outstanding - basic (in shares)	125,605,403	124,754,174
OP Units (in shares)	5,596,191	5,621,470
Shares related to exchangeable senior notes and dilutive stock options (in shares)	541,570	704,970
Average number of common shares outstanding - diluted (in shares)	132,618,644	131,956,094
Earnings per common share
Basic (in dollars per share)	$ 0.65	$ 0.66
Diluted (in dollars per share)	$ 0.64	$ 0.66
Series A Units [Member]
Weighted average common shares outstanding:
Preferred series units (in shares)	875,480	875,480

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Earnings Per Common Share - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Feb. 29, 2016	Sep. 30, 2015	Jun. 21, 2013
Earnings Per Share [Line Items]
Average share price (in dollars per share)	$ 75.47	$ 86.91
Principal amount of notes outstanding	$ 612,233,000		$ 610,314,000
Series A Units [Member]
Earnings Per Share [Line Items]
Exchangeable preferred operating partnership units settled in cash, minimum	115,000,000
Operating Partnership [Member] | Exchangeable Senior Notes 2.375% due 2033 (the 2013 Notes) [Member]
Earnings Per Share [Line Items]
Principal amount of notes outstanding	$ 63,170,000		63,170,000	$ 19,639,000
Interest rate	2.375%					2.375%
Exchange price (in dollars per share)	$ 53.81
Shares related to the Notes included in the computation for diluted earnings per share (in shares)	336,848	441,598
Operating Partnership [Member] | Exchangeable Senior Notes 3.125% due 2035 (the 2015 Notes) [Member]
Earnings Per Share [Line Items]
Principal amount of notes outstanding	$ 575,000,000		$ 575,000,000
Interest rate	3.125%				3.125%
Exchange price (in dollars per share)	$ 94.47
Shares related to the Notes included in the computation for diluted earnings per share (in shares)	0	0
Stock Options [Member]
Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per common share (in shares)	103,854	67,812

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Store Acquisitions - Schedule of Operating Properties Acquired (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) store
Property Acquisitions [Line Items]
Number of Stores | store	2
Cash Paid	$ 25,541
Net Liabilities/(Assets) Assumed	15
Fair value, real estate assets	$ 25,556
Illinois Property 2/1/2017 [Member]
Property Acquisitions [Line Items]
Number of Stores | store	1
Cash Paid	$ 9,020
Net Liabilities/(Assets) Assumed	8
Fair value, real estate assets	$ 9,028
Georgia Property 1/6/2017 [Member]
Property Acquisitions [Line Items]
Number of Stores | store	1
Cash Paid	$ 16,521
Net Liabilities/(Assets) Assumed	7
Fair value, real estate assets	$ 16,528

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Variable Interests - Schedule of Assets and Liabilities and Maximum Exposure to Loss Related to Trusts (Detail) - Operating Partnership [Member] - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
Unamortized debt issuance costs	$ (8,430,000)	$ (9,033,000)
Net carrying amount of liability components	612,233,000	$ 610,314,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Investment Balance
Maximum exposure to loss
Difference
Variable Interest Entity, Not Primary Beneficiary [Member] | Notes Payable to Trusts [Member]
Variable Interest Entity [Line Items]
Unamortized debt issuance costs	(2,238,000)
Net carrying amount of liability components	117,352,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Trust I [Member]
Variable Interest Entity [Line Items]
Investment Balance	1,083,000
Maximum exposure to loss	35,000,000
Difference	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Trust I [Member] | Notes Payable to Trusts [Member]
Variable Interest Entity [Line Items]
Notes payable to Trusts	36,083,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Trust II [Member]
Variable Interest Entity [Line Items]
Investment Balance	1,269,000
Maximum exposure to loss	41,000,000
Difference	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Trust II [Member] | Notes Payable to Trusts [Member]
Variable Interest Entity [Line Items]
Notes payable to Trusts	42,269,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Trust III [Member]
Variable Interest Entity [Line Items]
Investment Balance	1,238,000
Maximum exposure to loss	40,000,000
Difference	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Trust III [Member] | Notes Payable to Trusts [Member]
Variable Interest Entity [Line Items]
Notes payable to Trusts	41,238,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Subtotal [Member]
Variable Interest Entity [Line Items]
Investment Balance	3,590,000
Maximum exposure to loss	116,000,000
Difference	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Subtotal [Member] | Notes Payable to Trusts [Member]
Variable Interest Entity [Line Items]
Notes payable to Trusts	$ 119,590,000

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Variable Interests - Additional Information (Detail)	Mar. 31, 2017 joint_venture subsidiary
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of wholly-owned unconsolidated subsidiaries | subsidiary	3
Number of interests in consolidated VIE joint ventures | joint_venture	0

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Derivatives - Schedule of Balance Sheet Classification and Fair Value of Entity's Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Other Assets [Member]
Derivative [Line Items]
Other assets	$ 28,744	$ 23,844
Other Liabilities [Member]
Derivative [Line Items]
Other liabilities	$ (1,073)	$ (2,447)

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Derivatives - Schedule of Information Relating to Gain (Loss) Recognized on Swap Agreements (Detail) - Cash Flow Hedging [Member] - Interest Rate Swap [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative [Line Items]
Swap agreements gain (loss) recognized in OCI	$ 3,006	$ (34,960)
Swap agreements gain (loss) reclassified from OCI - Interest expense	$ (3,330)	$ (4,454)

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Derivatives - Additional Information (Detail) $ in Thousands	Mar. 31, 2017 USD ($) derivative
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	$ 4,209
Number of derivative financial instruments | derivative	28
Combined notional amount	$ 2,052,010
Credit risk derivative, fair value of derivatives in a net liability position	1,361
Estimated termination value on settlement	$ 1,361

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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, 2017	Dec. 31, 2016	Feb. 29, 2016	Sep. 30, 2015	Jun. 21, 2013
Debt Instrument [Line Items]
Principal amount of liability components	$ 612,233	$ 610,314
Operating Partnership [Member]
Debt Instrument [Line Items]
Carrying amount of equity components	22,597	22,597
Unamortized debt issuance costs	(8,430)	(9,033)
Net carrying amount of liability components	612,233	610,314
Operating Partnership [Member] | Exchangeable Senior Notes 2.375% due 2033 (the 2013 Notes) [Member]
Debt Instrument [Line Items]
Carrying amount of equity components	0	0
Principal amount of liability components	63,170	63,170	$ 19,639
Unamortized discount - equity components	(992)	(1,187)
Unamortized cash discount - 2013 Notes	(234)	(281)	(716)		$ (3,750)
Unamortized debt issuance costs			$ (36)		$ (1,672)
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	$ (16,281)	$ (17,355)
Unamortized debt issuance costs				$ (11,992)

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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, 2017	Mar. 31, 2016
Debt Disclosure [Abstract]
Contractual interest	$ 4,867	$ 4,882
Amortization of discount	1,269	1,233
Total interest expense recognized	$ 6,136	$ 6,115

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Exchangeable Senior Notes - Summary of Repurchase of Debt (Detail) - USD ($) $ in Thousands	Feb. 29, 2016	Mar. 31, 2017	Dec. 31, 2016	Jun. 21, 2013
Debt Instrument [Line Items]
Exchangeable senior notes repurchased		$ 612,233	$ 610,314
Operating Partnership [Member]
Debt Instrument [Line Items]
Related debt issuance costs		8,430	9,033
Operating Partnership [Member] | Exchangeable Senior Notes 2.375% 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	63,170	63,170
Extinguishment of liability component	(18,887)
Discount on exchangeable senior notes	(716)	$ (234)	$ (281)	$ (3,750)
Related debt issuance costs	36			$ 1,672
Gain/(loss) on repurchase	$ 0

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Exchangeable Senior Notes - Additional Information (Detail)		1 Months Ended		3 Months Ended
	Jun. 21, 2013 USD ($)	Feb. 29, 2016 USD ($) shares	Sep. 30, 2015 USD ($)	Mar. 31, 2017 USD ($) d	Dec. 31, 2016 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
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 2.375% 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%
Operating Partnership [Member]
Debt Instrument [Line Items]
Related debt issuance costs				$ 8,430,000	$ 9,033,000
Operating Partnership [Member] | Exchangeable Senior Notes 3.125% due 2035 (the 2015 Notes) [Member]
Debt Instrument [Line Items]
Principal amount of notes issued			$ 575,000,000
Interest rate			3.125%	3.125%
Underwriting fee percentage			2.00%
Amortization period			5 years
Conversion ratio, number of shares per $1,000 principal amount, numerator				10.58
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%
Related debt issuance costs			$ 11,992,000
Operating Partnership [Member] | Exchangeable Senior Notes 3.125% due 2035 (the 2015 Notes) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Number of days of written notice to holders of notes required for redemption			30 days
Operating Partnership [Member] | Exchangeable Senior Notes 3.125% due 2035 (the 2015 Notes) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Number of days of written notice to holders of notes required for redemption			60 days
Operating Partnership [Member] | Exchangeable Senior Notes 2.375% due 2033 (the 2013 Notes) [Member]
Debt Instrument [Line Items]
Principal amount of notes issued	$ 250,000,000
Interest rate	2.375%			2.375%
Conversion ratio, number of shares per $1,000 principal amount, numerator				18.58
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	1.50%
Unamortized cash discount	$ 3,750,000	716,000		$ 234,000	$ 281,000
Related debt issuance costs	$ 1,672,000	36,000
Amortization period	5 years
Principal amount repurchased		$ 19,639,000
Operating Partnership [Member] | Exchangeable Senior Notes 2.375% due 2033 (the 2013 Notes) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Number of days of written notice to holders of notes required for redemption	30 days
Operating Partnership [Member] | Exchangeable Senior Notes 2.375% due 2033 (the 2013 Notes) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Number of days of written notice to holders of notes required for redemption	60 days

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Stockholders' Equity - Additional Information (Detail) - At the Market Equity Distribution Agreement [Member]		3 Months Ended
	May 06, 2016 USD ($) sales_agent	Mar. 31, 2017 USD ($) shares
Changes In Equity And Comprehensive Income Line Items [Line Items]
Aggregate offering price of common share	$ 400,000,000
Number of sales agents | sales_agent	5
Shares, issued | shares		0
Value of stock available for issuance under ATM		$ 349,375,000

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Noncontrolling Interest Represented by Preferred Operating Partnership Units - Additional Information (Details) $ / shares in Units, $ in Thousands										1 Months Ended	3 Months Ended		6 Months Ended
	Nov. 04, 2016 USD ($) shares	May 21, 2016 USD ($) store shares	Oct. 03, 2014 USD ($) shares	Apr. 03, 2014 USD ($) store shares	Nov. 19, 2013 store	Sep. 26, 2013 USD ($) store shares	Aug. 29, 2013 store	Jun. 25, 2007 USD ($) shares	Jun. 15, 2007 store shares	Dec. 31, 2014 USD ($) store shares	Mar. 31, 2017 USD ($) shares store $ / shares	Mar. 31, 2016 USD ($)	May 31, 2014 USD ($) store shares	Dec. 31, 2016 USD ($)	Jun. 15, 2016 USD ($)
Noncontrolling Interest [Line Items]
Note receivable from noncontrolling interest represented by Preferred Operating Partnership units											$ 120,230			$ 120,230
Redemption of Operating Partnership units held by noncontrolling interests											$ 1,754	$ 0
Number of stores acquired | store											2
Series B Redeemable Preferred Units [Member] | Series B Units [Member]
Noncontrolling Interest [Line Items]
Liquidation value (in dollars per share) | $ / shares											$ 25
Fixed liquidation value											$ 41,902
Annual rate of return (as a percent)											6.00%
Series B Redeemable Preferred Units [Member] | Series B Units [Member] | Georgia, 1 Property Acquired 4/3/2014 [Member]
Noncontrolling Interest [Line Items]
Preferred units issued as part of acquisition (in units) | shares				333,360
Preferred units issued as part of acquisition				$ 8,334
Series C Convertible Redeemable Preferred Units [Member] | California, Properties Acquired December 2013 [Member]
Noncontrolling Interest [Line Items]
Number of stores acquired | store					12
Ownership interests in five stores through joint ventures prior to the acquisition													35.00%
Number of stores in which ownership interest was held prior to acquisition of remaining properties | store													5
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
Series C Convertible Redeemable Preferred Units [Member] | Series C Units [Member]
Noncontrolling Interest [Line Items]
Note receivable from noncontrolling interest represented by Preferred Operating Partnership units										$ 20,230
Note receivable interest rate										5.00%
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 (in dollars per share) | $ / shares											$ 0.18
Number of months 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
Preferred OP units conversion ratio | shares											0.9145
Note receivable maturity date										Dec. 15, 2024
Series D Redeemable Preferred Units [Member] | Series D Units [Member]
Noncontrolling Interest [Line Items]
Liquidation value (in dollars per share) | $ / shares											$ 25.00
Fixed liquidation value											$ 80,903
Series D Redeemable Preferred Units [Member] | D-1 Units[Member] | Minimum [Member]
Noncontrolling Interest [Line Items]
Annual rate of return (as a percent)											3.50%
Series D Redeemable Preferred Units [Member] | D-1 Units[Member] | Maximum [Member]
Noncontrolling Interest [Line Items]
Annual rate of return (as a percent)											5.00%
Operating Partnership [Member] | Illinois Property Acquired 5/21/2016 [Member]
Noncontrolling Interest [Line Items]
Number of stores acquired | store		4
Operating Partnership [Member] | Series A Participating Redeemable Preferred Units [Member]
Noncontrolling Interest [Line Items]
Number of stores acquired | store									10
Operating Partnership [Member] | Series A Participating Redeemable Preferred Units [Member] | Series A Units [Member]
Noncontrolling Interest [Line Items]
Preferred units issued as part of acquisition (in units) | shares									989,980
Fixed priority return on preferred OP units, amount															$ 115,000
Fixed priority return on preferred OP units, stated return rate											5.00%
Fixed priority return on preferred OP units, liquidation value											$ 115,000
Operating Partnership [Member] | Series B Redeemable Preferred Units [Member] | Georgia, 1 Property Acquired 4/3/2014 [Member]
Noncontrolling Interest [Line Items]
Number of stores acquired | store				1
Cash portion of payment for acquisition				$ 15,158
Operating Partnership [Member] | Series B Redeemable Preferred Units [Member] | California, 20 Properties Acquired 2013-September [Member]
Noncontrolling Interest [Line Items]
Number of stores acquired | store						1	19
Cash portion of payment for acquisition						$ 100,876
Number of stores acquired as part of portfolio acquisition | store							20
Debt assumed						$ 98,960
Number of common units issued as part of acquisition (in units) | shares						1,448,108
OP units issued as part of the acquisition						$ 62,341
Operating Partnership [Member] | Series B Redeemable Preferred Units [Member] | Series B Units [Member] | California, 20 Properties Acquired 2013-September [Member]
Noncontrolling Interest [Line Items]
Preferred units issued as part of acquisition (in units) | shares						1,342,727
Preferred units issued as part of acquisition						$ 33,568
Operating Partnership [Member] | Series C Convertible Redeemable Preferred Units [Member] | California, Properties Acquired December 2013 [Member]
Noncontrolling Interest [Line Items]
Cash portion of payment for acquisition													$ 45,722
Debt assumed													$ 37,532
Number of stores acquired | store													6
Operating Partnership [Member] | Series C Convertible Redeemable Preferred Units [Member] | Series C Units [Member] | California, Properties Acquired December 2013 [Member]
Noncontrolling Interest [Line Items]
Preferred units issued as part of acquisition (in units) | shares													704,016
Preferred units issued as part of acquisition													$ 30,960
Operating Partnership [Member] | Series D Redeemable Preferred Units [Member] | Self Storage Facility in Florida [Member]
Noncontrolling Interest [Line Items]
Number of stores acquired | store										1
Cash portion of payment for acquisition										$ 5,621
Operating Partnership [Member] | Series D Redeemable Preferred Units [Member] | D-4 Preferred Units [Member] | Illinois Property Acquired 5/21/2016 [Member]
Noncontrolling Interest [Line Items]
Number of OP units issued for store acquisition (in units) | shares	486,244
Operating Partnership units issued	$ 12,156
Operating Partnership [Member] | Series D Redeemable Preferred Units [Member] | D-3 Units [Member] | Illinois Property Acquired 5/21/2016 [Member]
Noncontrolling Interest [Line Items]
Number of OP units issued for store acquisition (in units) | shares		2,201,467
Operating Partnership units issued		$ 55,037
Operating Partnership [Member] | Series D Redeemable Preferred Units [Member] | Series D Units [Member] | Self Storage Facility in Florida [Member]
Noncontrolling Interest [Line Items]
Preferred units issued as part of acquisition (in units) | shares										548,390
Preferred units issued as part of acquisition										$ 13,710
Operating Partnership Holders of A Units [Member] | Series A Participating Redeemable Preferred Units [Member]
Noncontrolling Interest [Line Items]
Note receivable from noncontrolling interest represented by Preferred Operating Partnership units								$ 100,000
Note receivable interest rate								4.85%
Maximum number of preferred OP units converted prior to the maturity date of the loan (in units) | shares								114,500
A units redeemed | shares			114,500
Redemption of Operating Partnership units held by noncontrolling interests			$ 4,794
Common shares issued in Preferred Unit redemption (in shares) | shares			280,331
Additional units redeemed (in units) | shares			0

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Noncontrolling Interest in Operating Partnership - Additional Information (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares
Noncontrolling Interest [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
OP units conversion ratio	1
Ten day average closing stock price (in dollars per share) | $ / shares	$ 74.84
Consideration to be paid on redemption of common OP units | $	$ 1,754
Number of OP units issued for remaining interest in joint venture (in units) | shares	23,796
Operating Partnership [Member]
Noncontrolling Interest [Line Items]
Ownership interest held by entity	91.20%
Ownership percentage in joint venture	8.80%
OP units outstanding (in units) | shares	5,584,242
Consideration to be paid on redemption of common OP units | $	$ 417,925

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Other Noncontrolling Interests - Additional Information (Detail) - Other [Member]	Mar. 31, 2017 joint_venture
Noncontrolling Interest [Line Items]
Number of consolidated joint ventures	1
Voting interests of third-party owners	20.00%

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Equity in Earnings of Unconsolidated Real Estate Ventures - Gain on Sale of Real Estate and Purchase of Joint Venture Partner's Interest - Additional Information (Detail) $ in Thousands		3 Months Ended
	Feb. 02, 2016 USD ($) store	Mar. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Fair value, real estate assets			$ 25,556
VRS [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Number of stores acquired | store	6
Ownership interest percentage	45.04%
Extra Space Properties One Two Two LLC [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Number of stores acquired | store	6
Number of transferred stores | store	6
Net carrying amount of properties distributed	$ 17,261
Business combination, step acquisition, equity interest in acquiree, including subsequent acquisition, percentage	100.00%
Business combination, step acquisition, equity interest in acquiree, fair value	$ 44,184
Equity interest fair value remeasurement non-cash gain		$ 26,923
Prudential Real Estate and Affiliates [Member] | VRS [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Business acquisition, percentage of voting interests acquired	54.96%
Prudential Real Estate and Affiliates [Member] | Extra Space Properties One Two Two LLC [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Business acquisition, percentage of voting interests acquired	54.96%
Business combination amount paid to acquire joint venture partner's interest	$ 53,940
Various States Properties Feb 2, 2016 [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Fair value, real estate assets	$ 98,082

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Segment Information - Schedule of Financial Information of Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Investment in unconsolidated real estate ventures	$ 79,385		$ 79,570
Total assets	7,034,357		7,091,446
Total revenues	263,008	$ 229,403
Operating expenses, including depreciation and amortization	138,805	135,775
Income (loss) from operations	124,203	93,628
Loss on earnout from prior acquisition	0	(1,544)
Interest expense	(35,970)	(31,359)
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	(1,269)	(1,233)
Interest income	1,102	1,714
Interest income on note receivable from Preferred Operating Partnership unit holder	1,213	1,213
Equity in earnings of unconsolidated real estate ventures	3,579	2,830
Equity in earnings of unconsolidated real estate ventures - gain on sale of real estate assets and purchase of joint venture partner's interest	0	26,923
Income tax (expense) benefit	(3,124)	(2,765)
Net income (loss)	89,734	89,407
Depreciation and amortization expense	49,432	42,897
Acquisition of real estate assets	(39,136)	(234,820)
Development and redevelopment of real estate assets	(5,246)	(6,543)
Rental Operations [Member]
Segment Reporting Information [Line Items]
Investment in unconsolidated real estate ventures	79,385		79,570
Total assets	6,729,670		6,731,292
Total revenues	231,493	199,488
Operating expenses, including depreciation and amortization	115,357	101,698
Income (loss) from operations	116,136	97,790
Interest expense	(34,821)	(30,565)
Equity in earnings of unconsolidated real estate ventures	3,579	2,830
Income tax (expense) benefit	(463)	(845)
Net income (loss)	84,431	69,210
Depreciation and amortization expense	48,712	40,586
Tenant Reinsurance [Member]
Segment Reporting Information [Line Items]
Total assets	33,611		44,524
Total revenues	22,855	20,555
Operating expenses, including depreciation and amortization	3,920	4,311
Income (loss) from operations	18,935	16,244
Income tax (expense) benefit	(3,263)	(2,663)
Net income (loss)	15,672	13,581
Property Management, Acquisition and Development [Member]
Segment Reporting Information [Line Items]
Total assets	271,076		$ 315,630
Total revenues	8,660	9,360
Operating expenses, including depreciation and amortization	19,528	29,766
Income (loss) from operations	(10,868)	(20,406)
Loss on earnout from prior acquisition	0	(1,544)
Interest expense	(1,149)	(794)
Non-cash interest expense related to amortization of discount on equity component of exchangeable senior notes	(1,269)	(1,233)
Interest income	1,102	1,714
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 joint venture partner's interest	0	26,923
Income tax (expense) benefit	602	743
Net income (loss)	(10,369)	6,616
Depreciation and amortization expense	720	2,311
Acquisition of real estate assets	(39,136)	(234,820)
Development and redevelopment of real estate assets	$ (5,246)	$ (6,543)

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Segment Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 segment
Segment Reporting [Abstract]
Number of reportable segments	3

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Commitments and Contingencies - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) store
Commitments And Contingencies [Line Items]
Litigation liability recorded | $	$ 5,600
Commitment to acquire retail space [Member]
Commitments And Contingencies [Line Items]
Number of real estate properties to be acquired	2
Purchase price | $	$ 165,581
Number of stores scheduled to be closed	6
Commitment to acquire retail space [Member] | Construction in progress [Member]
Commitments And Contingencies [Line Items]
Number of real estate properties to be acquired	13
Commitment to acquire real estate with joint venture partners [Member]
Commitments And Contingencies [Line Items]
Number of real estate properties to be acquired	23
Purchase price | $	$ 141,887
Number of stores scheduled to be closed	11
Number of stores expected to be closed	12