10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

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

For the quarterly period ended June 30, 2017

OR

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

For the transition period from to

Commission file number: 001-37351

National Storage Affiliates Trust

(Exact name of Registrant as specified in its charter)

Maryland	46-5053858
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

5200 DTC Parkway

Suite 200

Greenwood Village, Colorado 80111

(Address of principal executive offices) (Zip code)

(720) 630-2600

(Registrant's telephone number including area code)

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 ☒ No ☐

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

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, 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 ☐	Accelerated Filer ☒
Non-accelerated Filer ☐	Smaller Reporting Company ☐
	Emerging Growth Company ☒

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. ☒

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    

Yes ☐ No ☒

As of August 2, 2017, 44,296,944 common shares of beneficial interest, $0.01 par value per share, were outstanding.

NATIONAL STORAGE AFFILIATES TRUST
TABLE OF CONTENTS
FORM 10-Q
		Page
PART I. FINANCIAL INFORMATION
ITEM 1.	Financial Statements	3
	Condensed Consolidated Balance Sheets as of June 30, 2017 and December 31, 2016 (Unaudited)	3
	Condensed Consolidated Statements of Operations for the Three and Six Months Ended June 30, 2017 and 2016 (Unaudited)	4
	Condensed Consolidated Statements of Comprehensive Income (Loss) for the Three and Six Months Ended June 30, 2017 and 2016 (Unaudited)	5
	Condensed Consolidated Statement of Changes in Equity for the Six Months Ended June 30, 2017 (Unaudited)	6
	Condensed Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2017 and 2016 (Unaudited)	7
	Notes to the Condensed Consolidated Financial Statements	8
ITEM 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	23
ITEM 3.	Quantitative and Qualitative Disclosures About Market Risk	41
ITEM 4.	Controls and Procedures	41
PART II. OTHER INFORMATION
ITEM 1.	Legal Proceedings	42
ITEM 1A.	Risk Factors	42
ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds	42
ITEM 3.	Defaults Upon Senior Securities	43
ITEM 4.	Mine Safety Disclosures	43
ITEM 5.	Other Information	43
ITEM 6.	Exhibits	43
Signatures		44

2

PART I. FINANCIAL INFORMATION

ITEM 1. Financial Statements

NATIONAL STORAGE AFFILIATES TRUST

CONDENSED CONSOLIDATED BALANCE SHEETS

(dollars in thousands, except per share amounts)

(Unaudited)

	June 30,			December 31,
	2017			2016
ASSETS
Real estate
Self storage properties	$	1,954,056		$	1,844,336
Less accumulated depreciation	(138,726		)	(110,803		)
Self storage properties, net	1,815,330			1,733,533
Cash and cash equivalents	13,591			12,570
Restricted cash	13,954			2,767
Debt issuance costs, net	2,668			3,069
Investment in unconsolidated real estate venture	89,916			81,486
Other assets, net	42,083			44,730
Assets held for sale	—			13,937
Total assets	$	1,977,542		$	1,892,092
LIABILITIES AND EQUITY
Liabilities
Debt financing	$	969,140		$	878,954
Accounts payable and accrued liabilities	21,050			21,616
Deferred revenue	12,685			12,454
Total liabilities	1,002,875			913,024
Commitments and contingencies (Note 11)
Equity
Common shares of beneficial interest, par value $0.01 per share. 250,000,000 shares authorized, 44,279,824 and 43,110,362 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	443			431
Additional paid-in capital	594,192			576,365
Distributions in excess of earnings	(27,870		)	(8,719		)
Accumulated other comprehensive income	8,748			9,025
Total shareholders' equity	575,513			577,102
Noncontrolling interests	399,154			401,966
Total equity	974,667			979,068
Total liabilities and equity	$	1,977,542		$	1,892,092

See notes to condensed consolidated financial statements.

3

NATIONAL STORAGE AFFILIATES TRUST

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share amounts)

(Unaudited)

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
REVENUE
Rental revenue	$	60,154		$	45,784		$	117,998		$	84,285
Other property-related revenue	2,045			1,500			3,926			2,648
Management fees and other revenue	2,142			—			3,980			—
Total revenue	64,341			47,284			125,904			86,933
OPERATING EXPENSES
Property operating expenses	19,803			15,457			39,552			28,734
General and administrative expenses	7,405			4,837			14,586			9,172
Depreciation and amortization	17,800			13,088			36,483			23,980
Total operating expenses	45,008			33,382			90,621			61,886
Income from operations	19,333			13,902			35,283			25,047
OTHER (EXPENSE) INCOME
Interest expense	(8,160		)	(5,844		)	(15,631		)	(10,785		)
Loss on early extinguishment of debt	—			(136		)	—			(136		)
Equity in losses of unconsolidated real estate venture	(765		)	—			(1,550		)	—
Acquisition costs	(167		)	(1,708		)	(311		)	(2,996		)
Non-operating expense	(14		)	(57		)	(66		)	(62		)
Gain on sale of self storage properties	5,637			—			5,637			—
Other expense	(3,469		)	(7,745		)	(11,921		)	(13,979		)
Income before income taxes	15,864			6,157			23,362			11,068
Income tax expense	(288		)	(112		)	(605		)	(221		)
Net income	15,576			6,045			22,757			10,847
Net (income) loss attributable to noncontrolling interests	(13,209		)	1,325			(19,835		)	(1,267		)
Net income attributable to National Storage Affiliates Trust	$	2,367		$	7,370		$	2,922		$	9,580
Earnings (loss) per share - basic	$	0.05		$	0.32		$	0.07		$	0.42
Earnings (loss) per share - diluted	$	0.05		$	0.08		$	0.07		$	0.15
Weighted average shares outstanding - basic	44,223			23,078			43,814			23,041
Weighted average shares outstanding - diluted	44,223			73,531			43,814			70,763
Dividends declared per common share	$	0.26		$	0.22		$	0.50		$	0.42

See notes to condensed consolidated financial statements.

4

NATIONAL STORAGE AFFILIATES TRUST

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(dollars in thousands)

(Unaudited)

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Net income	$	15,576		$	6,045		$	22,757		$	10,847
Other comprehensive income (loss)
Unrealized loss on derivative contracts	(3,852		)	(6,542		)	(2,239		)	(8,437		)
Reclassification of other comprehensive loss to interest expense	760			506			1,530			909
Other comprehensive loss	(3,092		)	(6,036		)	(709		)	(7,528		)
Comprehensive income	12,484			9			22,048			3,319
Comprehensive (income) loss attributable to noncontrolling interests	(11,992		)	7,361			(19,578		)	5,568
Comprehensive income attributable to National Storage Affiliates Trust	$	492		$	7,370		$	2,470		$	8,887

See notes to condensed consolidated financial statements.

5

NATIONAL STORAGE AFFILIATES TRUST

CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY

(dollars in thousands, except share amounts)

(Unaudited)

											Accumulated
					Additional			Distributions			Other
	Common Shares				Paid-in			In Excess Of			Comprehensive			Noncontrolling			Total
	Number		Amount		Capital			Earnings			Income			Interests			Equity
Balances, December 31, 2016	43,110,362		$	431	$	576,365		$	(8,719	)	$	9,025		$	401,966		$	979,068
OP equity issued for property acquisitions:
OP units and subordinated performance units, net of offering costs	—		—		—			—			—			13,058			13,058
LTIP units	—		—		—			—			—			587			587
Issuance of subordinated performance units	—		—		—			—			—			7,000			7,000
Redemptions of OP units	1,153,518		12		15,155			—			239			(15,406		)	—
Effect of changes in ownership for consolidated entities	—		—		2,572			—			(64		)	(2,508		)	—
Equity-based compensation expense	—		—		120			—			—			1,803			1,923
Issuance of LTIP units for acquisition expenses	—		—		—			—			—			4			4
Issuance of restricted common shares	16,525		—		—			—			—			—			—
Vesting and forfeitures of restricted common shares, net	(581	)	—		(20		)	—			—			—			(20		)
Reduction in receivables from partners of OP	—		—		—			—			—			438			438
Other comprehensive loss	—		—		—			—			(452		)	(257		)	(709		)
Common share dividends	—		—		—			(22,073		)	—			—			(22,073		)
Distributions to noncontrolling interests	—		—		—			—			—			(27,366		)	(27,366		)
Net income	—		—		—			2,922			—			19,835			22,757
Balances, June 30, 2017	44,279,824		$	443	$	594,192		$	(27,870	)	$	8,748		$	399,154		$	974,667

See notes to condensed consolidated financial statements.

6

NATIONAL STORAGE AFFILIATES TRUST

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(dollars in thousands)

(Unaudited)

	Six Months Ended June 30,
	2017			2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	22,757		$	10,847
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	36,483			23,980
Amortization of debt issuance costs	1,059			1,040
Amortization of debt discount and premium, net	(791		)	(1,026		)
Loss on debt extinguishment	—			136
Gain on sale of self storage properties	(5,637		)	—
LTIP units issued for acquisition expenses	—			56
Equity-based compensation expense	1,923			1,227
Equity in losses of unconsolidated real estate venture	1,550			—
Distributions from unconsolidated real estate venture	2,417			—
Change in assets and liabilities, net of effects of self storage property acquisitions:
Other assets	(3,312		)	(779		)
Accounts payable and accrued liabilities	(649		)	4,594
Deferred revenue	(256		)	304
Net Cash Provided by Operating Activities	55,544			40,379
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition of self storage properties	(86,945		)	(123,932		)
Capital expenditures	(7,085		)	(3,614		)
Investments in and advances to unconsolidated real estate venture	(12,647		)	—
Distributions from unconsolidated real estate venture	250			—
Deposits and advances for self storage property and other acquisitions	(565		)	(1,933		)
Expenditures for corporate furniture, equipment and other	(157		)	(336		)
Proceeds from sale of self storage properties	15,342			—
Net Cash Used In Investing Activities	(91,807		)	(129,815		)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of subordinated performance units	7,000			—
Borrowings under debt financings	310,500			381,500
Receipts for OP unit subscriptions	567			789
Collection of receivables from issuance of OP equity	—			570
Principal payments under debt financings	(218,762		)	(252,586		)
Payment of dividends to common shareholders	(22,073		)	(9,711		)
Distributions to noncontrolling interests	(26,866		)	(21,725		)
Debt issuance costs	(1,346		)	(4,612		)
Equity offering costs	(549		)	(311		)
Net Cash Provided By Financing Activities	48,471			93,914
Increase in Cash, Cash Equivalents and Restricted Cash	12,208			4,478
CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Beginning of period	15,337			9,377
End of period	$	27,545		$	13,855

Supplemental Cash Flow Information
Cash paid for interest	$	15,061	$	10,354

See notes to condensed consolidated financial statements.

7

NATIONAL STORAGE AFFILIATES TRUST

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

June 30, 2017

(Unaudited)

1. ORGANIZATION AND NATURE OF OPERATIONS

National Storage Affiliates Trust was organized in the state of Maryland on May 16, 2013 and is a fully integrated, self-administered and self-managed real estate investment trust focused on the self storage sector. As used herein, "NSA," the "Company," "we," "our," and "us" refers to National Storage Affiliates Trust and its consolidated subsidiaries, except where the context indicates otherwise. The Company has elected and believes it has qualified as a real estate investment trust ("REIT") for U.S. federal income tax purposes commencing with its taxable year ending December 31, 2015.

Through its controlling interest as the sole general partner of NSA OP, LP (its "operating partnership"), a Delaware limited partnership formed on February 13, 2013, the Company is focused on the ownership, operation, and acquisition of self storage properties located within the top 100 metropolitan statistical areas in the United States. Pursuant to the Agreement of Limited Partnership (as amended, the "LP Agreement") of its operating partnership, the Company's operating partnership is authorized to issue Class A Units ("OP units"), different series of Class B Units ("subordinated performance units"), and Long-Term Incentive Plan Units ("LTIP units"). The Company also owns certain of its self storage properties through other consolidated limited partnership subsidiaries of its operating partnership, which the Company refers to as "DownREIT partnerships." The DownREIT partnerships issue equity ownership interests that are intended to be economically equivalent to the Company's OP units ("DownREIT OP units") and subordinated performance units ("DownREIT subordinated performance units").

The Company owned 394 self storage properties in 21 states with approximately 23.9 million rentable square feet in approximately 190,000 storage units as of June 30, 2017. These properties are managed with local operational focus and expertise by the Company's participating regional operators ("PROs"). These PROs are SecurCare Self Storage, Inc. and its controlled affiliates ("SecurCare"), Kevin Howard Real Estate Inc., d/b/a Northwest Self Storage and its controlled affiliates ("Northwest"), Optivest Properties LLC and its controlled affiliates ("Optivest"), Guardian Storage Centers LLC and its controlled affiliates ("Guardian"), Move It Self Storage and its controlled affiliates ("Move It"), Arizona Mini Storage Management Company d/b/a Storage Solutions and its controlled affiliates ("Storage Solutions"), Hide-Away Storage Services, Inc. and its controlled affiliates ("Hide-Away") and an affiliate of Shader Brothers Corporation d/b/a Personal Mini Storage ("Personal Mini") of Orlando, Florida.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The accompanying condensed consolidated financial statements are presented on the accrual basis of accounting in accordance with U.S. generally accepted accounting principles ("GAAP") and have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC") regarding interim financial reporting. Accordingly, certain information and footnote disclosures required by GAAP for complete financial statements have been condensed or omitted in accordance with such rules and regulations. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation of the condensed consolidated financial statements have been included. The Company's results of operations for the quarterly period ended June 30, 2017 are not necessarily indicative of the results to be expected for the full year or any other future period.

Principles of Consolidation

The Company's financial statements include the accounts of its operating partnership and its controlled subsidiaries. All significant intercompany balances and transactions have been eliminated in the consolidation of entities.

When the Company obtains an economic interest in an entity, the Company evaluates the entity to determine if the entity is deemed a variable interest entity ("VIE"), and if the Company is deemed to be the primary beneficiary, in accordance with authoritative guidance issued on the consolidation of VIEs. When an entity is not deemed to be a VIE, the Company considers the provisions of additional guidance to determine whether the general partner controls a limited partnership or similar entity when the limited partners have certain rights. The Company consolidates all entities that are VIEs and of which the Company is deemed to be the primary beneficiary. The Company has determined that its operating partnership is a VIE. The sole significant asset of National Storage Affiliates Trust is its investment in its

8

operating partnership, and consequently, substantially all of the Company’s assets and liabilities represent those assets and liabilities of its operating partnership.

As of June 30, 2017 and December 31, 2016, the Company's operating partnership was the primary beneficiary of, and therefore consolidated, 21 DownREIT partnerships that are considered VIEs, which owned 34 self storage properties. The net book value of the real estate owned by these VIEs was $252.9 million and $256.8 million as of June 30, 2017 and December 31, 2016, respectively. For the DownREIT partnerships which are subject to fixed rate mortgages payable, the carrying value of such fixed rate mortgages payable held by these VIEs was $40.5 million and $41.4 million as of June 30, 2017 and December 31, 2016, respectively. The creditors of the consolidated VIEs do not have recourse to the Company's general credit.

Reclassifications

Certain amounts in the consolidated financial statements and related notes have been reclassified to conform to the current year presentation. Such reclassifications do not impact the Company's previously reported financial position or net income (loss).

Revenue Recognition

Management has determined that all of the Company's leases are operating leases. Substantially all leases may be terminated on a month-to-month basis and rental income is recognized ratably over the lease term using the straight-line method. Rents received in advance are deferred and recognized on a straight-line basis over the related lease term associated with the prepayment. Promotional discounts and other incentives are recognized as a reduction to rental income over the applicable lease term. Other property-related revenue consists of ancillary revenues such as tenant insurance-related access fees and commissions and sales of storage supplies which are recognized in the period earned.

The Company recognizes gains from disposition of facilities only upon closing in accordance with the guidance on sales of real estate. Payments received from purchasers prior to closing are recorded as deposits. Profit on real estate sold is recognized using the full accrual method upon closing when the collectability of the sales price is reasonably assured and the Company is not obligated to perform significant activities after the sale. Profit may be deferred in whole or part until the sale meets the requirements of profit recognition on sales under this guidance.

The Company earns management and other fees for managing and operating its unconsolidated real estate venture. These fees include property management fees, call center fees, platform fees, acquisition fees, development fees and a portion of tenant warranty protection proceeds. The Company recognizes these fees when they are earned, fixed and determinable. The fees are reported in management fees and other revenue in the Company's condensed consolidated statements of operations.

Investments in Unconsolidated Real Estate Venture

The Company’s investment in its unconsolidated real estate venture is recorded under the equity method of accounting in the accompanying consolidated financial statements. Under the equity method, the Company’s investment in unconsolidated real estate venture is stated at cost and adjusted for the Company’s share of net earnings or losses and reduced by distributions. Equity in earnings (losses) is recognized based on the Company’s ownership interest in the earnings (losses) of the unconsolidated real estate venture. The Company follows the "look through" approach for classification of distributions from its unconsolidated real estate venture in its consolidated statements of cash flows. Under this approach, distributions are reported under operating cash flow unless the facts and circumstances of a specific distribution clearly indicate that it is a return of capital (e.g., proceeds from the unconsolidated real estate venture’s sale of assets), in which case it is reported as an investing activity.

Noncontrolling Interests

All of the limited partner equity interests in the operating partnership not held by the Company are reflected as noncontrolling interests. Noncontrolling interests also include ownership interests in DownREIT partnerships held by entities other than the operating partnership or its subsidiaries. In the condensed consolidated statements of operations, the Company allocates net income (loss) attributable to noncontrolling interests to arrive at net income (loss) attributable to National Storage Affiliates Trust.

For transactions that result in changes to the Company's ownership interest in its operating partnership, the carrying amount of noncontrolling interests is adjusted to reflect such changes. The difference between the fair value of the consideration received or paid and the amount by which the noncontrolling interest is adjusted is reflected as an adjustment to additional paid-in capital on the condensed consolidated balance sheets.

9

Allocation of Net Income (Loss)

The distribution rights and priorities set forth in the operating partnership's LP Agreement differ from what is reflected by the underlying percentage ownership interests of the unitholders. Accordingly, the Company allocates GAAP income (loss) utilizing the hypothetical liquidation at book value ("HLBV") method, in which the Company allocates income or loss based on the change in each unitholders’ claim on the net assets of its operating partnership at period end after adjusting for any distributions or contributions made during such period. The HLBV method is commonly applied to equity investments where cash distribution percentages vary at different points in time and are not directly linked to an equity holder’s ownership percentage.

The HLBV method is a balance sheet-focused approach to income (loss) allocation. A calculation is prepared at each balance sheet date to determine the amount that unitholders would receive if the operating partnership were to liquidate all of its assets (at GAAP net book value) and distribute the resulting proceeds to its creditors and unitholders based on the contractually defined liquidation priorities. The difference between the calculated liquidation distribution amounts at the beginning and the end of the reporting period, after adjusting for capital contributions and distributions, is used to derive each unitholder's share of the income (loss) for the period. Due to the stated liquidation priorities and because the HLBV method incorporates non-cash items such as depreciation expense, in any given period, income or loss may be allocated disproportionately to unitholders as compared to their respective ownership percentage in the operating partnership, and net income (loss) attributable to National Storage Affiliates Trust could be more or less net income than actual cash distributions received and more or less income or loss than what may be received in the event of an actual liquidation. Additionally, the HLBV method could result in net income (or net loss) attributable to National Storage Affiliates Trust during a period when the Company reports consolidated net loss (or net income), or net income (or net loss) attributable to National Storage Affiliates Trust in excess of the Company's consolidated net income (or net loss). The computations of basic and diluted earnings (loss) per share may be materially affected by these disproportionate income (loss) allocations, resulting in volatile fluctuations of basic and diluted earnings (loss) per share.

Other Comprehensive Income (Loss)

The Company has cash flow hedge derivative instruments that are measured at fair value with unrealized gains or losses recognized in other comprehensive income (loss) with a corresponding adjustment to accumulated other comprehensive income within equity, as discussed further in Note 12. Under the HLBV method of allocating income (loss) discussed above, a calculation is prepared at each balance sheet date by applying the HLBV method including, and excluding, the assets and liabilities resulting from the Company's cash flow hedge derivative instruments to determine comprehensive income (loss) attributable to National Storage Affiliates Trust. As a result of the distribution rights and priorities set forth in the operating partnership's LP Agreement, in any given period, other comprehensive income (loss) may be allocated disproportionately to unitholders as compared to their respective ownership percentage in the operating partnership and as compared to their respective allocation of net income (loss).

Restricted Cash

The Company's restricted cash consists of escrowed funds deposited with financial institutions for real estate taxes, insurance and other reserves for capital improvements in accordance with the Company's loan agreements and like-kind exchange proceeds.

Assets held for sale

The Company classifies properties as held for sale when certain criteria are met. At such time, the properties, including significant assets and liabilities that are expected to be transferred as part of a sale transaction, are presented separately on the condensed consolidated balance sheet at the lower of carrying value or estimated fair value less costs to sell and depreciation is no longer recognized. As of December 31, 2016 the Company had two self storage properties classified as held for sale. The results of operations for the self storage properties classified as held for sale are reflected within income from operations in the Company's condensed consolidated statements of operations.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

10

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014-09 will replace most existing revenue recognition guidance in GAAP when it becomes effective. ASU 2014-09 is effective for the Company on January 1, 2018, with early application permitted for the Company on January 1, 2017. ASU 2014-09 permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its condensed consolidated financial statements and related disclosures. Although the Company has not yet selected a transition method, as ASU 2014-09 does not impact lessor accounting, the Company does not believe the adoption of ASU 2014-09 will significantly impact its accounting for rental revenue. The Company expects that certain property-related ancillary revenues and management and other fees will be in the scope of the new guidance. Based on the Company’s ongoing evaluation, the Company does not currently anticipate material changes to its recognition of revenue as a result of adopting ASU 2014-09.

In February 2016, the FASB issued ASU 2016-02, Leases, which amends the existing guidance for accounting for leases, including requiring lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases and lessees to recognize most leases on-balance sheet as lease liabilities with corresponding right-of-use assets. ASU 2016-02 is effective for the Company on January 1, 2019, with early application permitted. ASU 2016-02 requires a modified retrospective approach, with entities applying the new guidance at the beginning of the earliest period presented in the financial statements in which they first apply the new standard, with certain elective transition relief. The Company is evaluating the effect that ASU 2016-02 will have on its operating leases, condensed consolidated financial statements and related disclosures.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows, which clarifies the classification of certain cash receipts and cash payments in the statement of cash flows, including debt prepayment or extinguishment costs, settlement of contingent consideration arising from a business combination, insurance settlement proceeds, and distributions from certain equity method investees. The Company adopted ASU 2016-15 effective January 1, 2017, which did not result in any changes to the presentation of amounts shown on the Company's condensed consolidated statements of cash flows for the six months ended June 30, 2017 and 2016.

In November 2016, the FASB issued an ASU 2016-18, Statement of Cash Flows - Restricted Cash, that requires the inclusion of restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted ASU 2016-18 effective January 1, 2017, which resulted in the inclusion of the Company's restricted cash balances along with cash and cash equivalents in the Company's condensed consolidated statement of cash flows and separate line items showing changes in restricted cash balances were eliminated from the Company's condensed consolidated statements of cash flows. ASU 2016-18 was applied retrospectively to all periods presented.

In January 2017, the FASB issued ASU 2017-01, Clarifying the Definition of a Business, which narrows the definition of a business and provides an amended framework for determining whether a transaction involves an asset or a business. The Company adopted ASU 2017-01 effective January 1, 2017. As further discussed in Note 6, as a result of the adoption of ASU 2017-01, the Company's self storage property acquisitions during the six months ended June 30, 2017 were accounted for as asset acquisitions, and accordingly, the acquisition costs related to the self storage property acquisitions were capitalized as part of the basis of the acquired properties.

11

3. NONCONTROLLING INTERESTS

Noncontrolling Interests

All of the limited partner equity interests in the Company's operating partnership not held by the Company are reflected as noncontrolling interests. Noncontrolling interests also include ownership interests in DownREIT partnerships held by entities other than the Company's operating partnership. NSA is the general partner of its operating partnership and is authorized to cause its operating partnership to issue additional partner interests, including OP units and subordinated performance units, at such prices and on such other terms as it determines in its sole discretion.

As of June 30, 2017 and December 31, 2016, units reflecting noncontrolling interests consisted of the following:

	June 30, 2017	December 31, 2016
OP units	26,274,340	26,125,444
Subordinated performance units	11,418,815	11,022,378
LTIP units	934,323	1,543,905
DownREIT units
DownREIT OP units	1,834,786	1,834,786
DownREIT subordinated performance units	4,386,999	4,386,999
Total	44,849,263	44,913,512

OP Units and DownREIT OP units

OP units in the Company's operating partnership are redeemable for cash or, at the Company's option, exchangeable for the Company's common shares of beneficial interest, $0.01 par value per share ("common shares") on a one-for-one basis, and DownREIT OP units are redeemable for cash or, at the Company's option, exchangeable for OP units in its operating partnership on a one-for-one basis, subject to certain adjustments in each case. The holders of OP units are generally not entitled to elect redemption until one year after the later of the closing of the Company's initial public offering or the issuance of the OP units. The holders of DownREIT OP units are generally not entitled to elect redemption until five years after the date of the contributor's initial contribution. Accordingly, these limited partner interests are included in noncontrolling interests within equity in the accompanying condensed consolidated balance sheets as of June 30, 2017 and December 31, 2016.

The increase in OP Units outstanding from December 31, 2016 to June 30, 2017 was due to the conversion of 828,881 LTIP units into OP units and the issuance of 473,533 OP units in connection with the acquisition of self storage properties, partially offset by the redemption of 1,153,518 OP units for common shares.

Subordinated Performance Units and DownREIT Subordinated Performance Units

Subordinated performance units may also, under certain circumstances, be convertible into OP units which are exchangeable for common shares as described above, and DownREIT subordinated performance units may, under certain circumstances, be exchangeable for subordinated performance units on a one-for-one basis. Subordinated performance units are only convertible into OP units after a two year lock-out period and then generally (i) at the holder’s election only upon the achievement of certain performance thresholds relating to the properties to which such subordinated performance units relate or (ii) at the Company's election upon a retirement event of a PRO that holds such subordinated performance units or upon certain qualifying terminations. The holders of DownREIT subordinated performance units are generally not entitled to elect redemption until at least five years after the date of the contributor's initial contribution.

The increase in subordinated performance units outstanding from December 31, 2016 to June 30, 2017 was due to the issuance of 300,043 subordinated performance units to an affiliate of Personal Mini (the Company's chairman and chief executive officer, Arlen D. Nordhagen, has a noncontrolling minority ownership interest in this affiliate of Personal Mini) and the issuance of 96,394 subordinated performance units in connection with the acquisition of self storage properties.

12

LTIP Units

LTIP units are a special class of partnership interest in the Company's operating partnership that allow the holder to participate in the ordinary and liquidating distributions received by holders of the OP units (subject to the achievement of specified levels of profitability by the Company's operating partnership or the achievement of certain events). LTIP units may also, under certain circumstances, be convertible into OP units on a one-for-one basis, which are then exchangeable for common shares as described above.

LTIP units were first granted under the 2013 Long-Term Incentive Plan (the "2013 Plan"). Some of the granted LTIP units vested immediately or upon completion of the Company's initial public offering. Others vest upon the contribution of self storage properties or along a schedule at certain times through January 1, 2020. LTIP units do not have full parity with OP units with respect to liquidating distributions and may not receive ordinary distributions until such parity is reached pursuant to the terms of the LP Agreement. If such parity is reached under the LP Agreement, upon vesting, vested LTIP units may be converted into an equal number of OP units, and thereafter have all the rights of OP units, including redemption rights.

The decrease in LTIP units outstanding from December 31, 2016 to June 30, 2017 was due to the conversion of 828,881 LTIP units into 828,881 OP units, partially offset by the issuance of 219,299 compensatory LTIP units to employees, consultants and trustees.

4. SELF STORAGE PROPERTIES

Self storage properties are summarized as follows (dollars in thousands):

	June 30, 2017			December 31, 2016
Land	$	482,983		$	456,135
Buildings and improvements	1,466,155			1,383,603
Furniture and equipment	4,918			4,598
Total self storage properties	1,954,056			1,844,336
Less accumulated depreciation	(138,726		)	(110,803		)
Self storage properties, net	$	1,815,330		$	1,733,533

Depreciation expense related to self storage properties amounted to $14.3 million and $10.1 million during the three months ended June 30, 2017 and 2016, respectively, and $28.4 million and $18.8 million during the six months ended June 30, 2017 and 2016, respectively.

13

5. INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURE

As of June 30, 2017, the Company's unconsolidated real estate venture owned and operated a portfolio of 70 properties containing approximately 4.9 million rentable square feet, configured in approximately 39,000 storage units and located across 13 states. The unconsolidated real estate venture acquired four self storage properties with an estimated fair value of $49.8 million during the six months ended June 30, 2017. The unconsolidated real estate venture financed the self storage property acquisitions with capital contributions from the unconsolidated real estate venture members, of which the Company contributed $12.5 million for its 25% proportionate share in the unconsolidated real estate venture.

The following table presents the condensed financial position of the unconsolidated real estate venture as of June 30, 2017 and December 31, 2016 (in thousands):

	June 30, 2017		December 31, 2016
ASSETS
Self storage properties, net	$	655,233	$	614,754
Other assets	14,141		19,936
Total assets	$	669,374	$	634,690
LIABILITIES AND EQUITY
Debt financing	$	317,192	$	317,047
Other liabilities	5,764		4,498
Equity	346,418		313,145
Total liabilities and equity	$	669,374	$	634,690

The following table presents the condensed operating information of the unconsolidated real estate venture for the three and six months ended June 30, 2017 (in thousands):

	Three Months Ended June 30, 2017			Six Months Ended June 30, 2017
Total revenue	$	13,059		$	25,566
Property operating expenses	4,432			8,500
Net operating income	8,627			17,066
Supervisory, administrative and other expenses	(941		)	(1,839		)
Depreciation and amortization	(7,676		)	(15,165		)
Interest expense	(2,802		)	(5,628		)
Acquisition and other expenses	(267		)	(633		)
Net loss	$	(3,059	)	$	(6,199	)

14

6. SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS

Acquisitions

The Company acquired 15 self storage properties with an estimated fair value of $101.9 million during the six months ended June 30, 2017. Of these acquisitions, six self storage properties with an estimated fair value of $33.4 million were acquired by the Company from its PROs. As a result of the Company's adoption of ASU 2017-01 during the six months ended June 30, 2017, the 15 self storage property acquisitions were accounted for as asset acquisitions and accordingly, $0.8 million of acquisition costs related to the acquisitions were capitalized as part of the basis of the acquired properties. The Company recognized the estimated fair value of the acquired assets and assumed liabilities on the respective dates of such acquisitions. The Company allocated the total purchase price to the estimated fair value of tangible and intangible assets acquired, and liabilities assumed. The Company allocated a portion of the purchase price to identifiable intangible assets consisting of customer in-place leases which were recorded at estimated fair value of $2.5 million, resulting in a total fair value of $99.4 million allocated to real estate.

The following table summarizes the investment in self storage property acquisitions completed by the Company during the six months ended June 30, 2017 (dollars in thousands):

Acquisitions Closed During the Three Months Ended:	Number of Properties	Summary of Investment
		Cash and Acquisition Costs		Value of OP Equity(1)		Other Liabilities		Total
March 31, 2017	5	$	26,780	$	4,964	$	183	$	31,927
June 30, 2017	10	60,672		8,931		387		69,990
Total	15	$	87,452	$	13,895	$	570	$	101,917

^{(1)  Value of OP equity represents the fair value of OP units, subordinated performance units and LTIP units.} 

Pro Forma Financial Information For 2016 Business Combinations

The Company acquired 107 self storage properties during the year ended December 31, 2016 that were accounted for as business combinations. On a pro forma basis, after giving effect to the acquisition of 100 of the 107 self storage properties as if they were acquired on January 1, 2015 (pro forma financial information is not presented for seven of the self storage properties acquired during the year ended December 31, 2016 since the information required is not available to the Company), the Company would have recorded incremental additional revenue and net income of $10.0 million and $1.9 million, respectively, for the three months ended June 30, 2016 and $25.5 million and $4.9 million for the six months ended June 30, 2016, respectively. This pro forma information was prepared using the following significant assumptions: (i) for the cash portion of the purchase price, the Company assumed borrowings under the Company's revolving line of credit with interest computed based on the effective interest rate of 1.87% as of June 30, 2016; (ii) for assumed debt financing directly associated with the acquisition of specific self storage properties, interest was computed for the entirety of the periods presented using the effective interest rates under such financings; and (iii) for acquisition costs of $1.7 million and $3.0 million incurred during the three and six months ended June 30, 2016, pro forma adjustments give effect to these costs as if they were incurred on January 1, 2015.

The pro forma information presented in the paragraph above does not purport to represent what the actual results of operations would have been for the periods indicated, nor does it purport to represent the Company's future results of operations. As described in greater detail above, given that certain information with respect to the business combinations is not available to the Company, readers of this Form 10-Q and investors are cautioned not to place undue reliance on the Company's pro forma financial information.

Dispositions

During the six months ended June 30, 2017, the Company sold to unrelated third parties three self storage properties. The gross sales price was $15.6 million and the Company recognized $5.6 million of gain on the sales.

15

7. OTHER ASSETS

Other assets consist of the following (dollars in thousands):

	June 30, 2017		December 31, 2016
Customer in-place leases, net of accumulated amortization of $8,068 and $7,831, respectively	$	4,660	$	9,374
Receivables:
Trade, net	1,766		1,898
PROs and other affiliates	739		601
Receivable from unconsolidated real estate venture	767		1,093
Property acquisition and other deposits	692		477
Interest rate swaps	7,559		8,742
Prepaid expenses and other	5,622		1,879
Corporate furniture, equipment and other, net	1,209		1,243
Trade name	3,200		3,200
Management contract, net of accumulated amortization of $502 and $148, respectively	10,119		10,473
Goodwill	5,750		5,750
Total	$	42,083	$	44,730

8. DEBT FINANCING

The Company's outstanding debt as of June 30, 2017 and December 31, 2016 is summarized as follows (dollars in thousands):

	Interest Rate(1)	June 30, 2017		December 31, 2016
Credit Facility:
Revolving line of credit	2.62%	$	181,000	$	246,500
Term loan A	2.60%	235,000		225,000
Term loan B	3.24%	155,000		100,000
Term loan C	3.71%	105,000		—
Term loan facility	3.08%	100,000		100,000
Fixed rate mortgages payable	4.15%	188,932		201,694
Total principal		964,932		873,194
Unamortized debt issuance costs and debt premium, net		4,208		5,760
Total debt		$	969,140	$	878,954

^{(1)  Represents the effective interest rate as of June 30, 2017. Effective interest rate incorporates the stated rate plus the impact of interest rate cash flow hedges and discount and premium amortization, if applicable. For the revolving line of credit, the effective interest rate excludes fees for unused borrowings.} 

Credit Facility Increase

 On February 8, 2017, pursuant to a partial exercise by the Company's operating partnership of its expansion option under its amended and restated credit agreement dated as of May 6, 2016, the Company's operating partnership, as borrower, certain of its subsidiaries that are party to the amended and restated credit agreement, as subsidiary guarantors, and the Company, as parent guarantor, entered into a second increase agreement and amendment (the "Increase Agreement") with a syndicated group of lenders to increase the total borrowing capacity under the tranche A term loan facility (the "Term Loan A") and the tranche B term loan facility (the "Term Loan B") by $10.0 million and $55.0

16

million, respectively, and to provide a new tranche C term loan facility ("Term Loan C") in an aggregate outstanding principal amount of $105.0 million, which, in the aggregate, increased the total borrowing capacity by $170.0 million for a total unsecured credit facility of $895.0 million consisting of the following components: (i) a $400.0 million revolving line of credit (the "Revolver" and together with the Term Loan A, Term Loan B and Term Loan C, the "credit facility"), (ii) Term Loan A, which now provides for a total borrowing commitment of up to $235.0 million, (iii) Term Loan B, which now provides for a total borrowing commitment of up to $155.0 million and (iv) Term Loan C, which provides for a total borrowing commitment of up to $105.0 million. The Company continues to have an expansion option under the credit facility, which, if exercised in full, would provide for a total credit facility of $1.0 billion.

The Term Loan C matures on February 8, 2024. It is not subject to any scheduled reduction or amortization payment prior to maturity. Interest rates applicable to loans under Term Loan C are determined based on a 1, 2, 3 or 6 month London Interbank Offered Rate ("LIBOR") period (as elected by the Company at the beginning of any applicable interest period) plus an applicable margin or a base rate, determined by the greatest of the Key Bank prime rate, the federal funds rate plus 0.50% or one month LIBOR plus 1.00%, plus an applicable margin. The applicable margins for Term Loan C are leverage based and range from 1.70% to 2.25% for LIBOR loans and 0.70% to 1.25% for base rate loans; provided that after such time as the Company achieves an investment grade rating from at least two rating agencies, the Company may elect (but is not required to elect) that Term Loan C is subject to the rating based on applicable margins ranging from 1.50% to 2.45% for LIBOR Loans and 0.50% to 1.45% for base rate loans. Prepayments of any loans under Term Loan C are subject to prepayment premiums of 2.00% from the date of the Increase Agreement through and including the first anniversary of the Increase Agreement and 1.00% from the first anniversary of the Increase Agreement through and including the second anniversary of the Increase Agreement. There is no prepayment penalty thereafter. Other than the increases and amendments related to Term Loan C described above, the Increase Agreement did not impact or amend the amended and restated credit agreement's previously disclosed terms, including its covenants, events of default, or terms of payment.

As of June 30, 2017, the Company had outstanding letters of credit totaling $4.7 million and would have had the capacity to borrow remaining Revolver commitments of $214.3 million while remaining in compliance with the credit facility's financial covenants. At June 30, 2017, the Company was in compliance with all such covenants.

For a summary of the Company's financial covenants and additional detail regarding the Company's credit facility, term loan facility, and fixed rate mortgage payables, please see Note 8 to the Company's most recent Annual Report on Form 10-K filed with the Securities and Exchange Commission.

Future Debt Obligations

Based on existing debt agreements in effect as of June 30, 2017, the scheduled principal and maturity payments for the Company's outstanding borrowings are presented in the table below (in thousands):

Year Ending December 31,	Scheduled Principal and Maturity Payments		Amortization of Premium and Unamortized Debt Issuance Costs			Total
Remainder of 2017	$	2,342	$	198		$	2,540
2018	10,617		293			10,910
2019	4,983		225			5,208
2020	220,245		(127		)	220,118
2021	242,509		(215		)	242,294
2022	159,205		68			159,273
Thereafter	325,031		3,766			328,797
	$	964,932	$	4,208		$	969,140

17

9. EARNINGS PER SHARE

The following table sets forth the computation of basic and diluted earnings (loss) per common share for the three and six months ended June 30, 2017 and 2016, respectively (in thousands, except per share amounts):

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Earnings (loss) per common share - basic and diluted
Numerator
Net income	$	15,576		$	6,045		$	22,757		$	10,847
Net (income) loss attributable to noncontrolling interests	(13,209		)	1,325			(19,835		)	(1,267		)
Net income attributable to National Storage Affiliates Trust	2,367			7,370			2,922			9,580
Distributed and undistributed earnings allocated to participating securities	(7		)	(5		)	(13		)	(9		)
Net income attributable to common shareholders - basic	2,360			7,365			2,909			9,571
Effect of assumed conversion of dilutive securities	—			(1,356		)	—			1,215
Net income attributable to common shareholders - diluted	$	2,360		$	6,009		$	2,909		$	10,786
Denominator
Weighted average shares outstanding - basic	44,223			23,078			43,814			23,041
Effect of dilutive securities:
Weighted average OP units outstanding	—			24,733			—			23,484
Weighted average DownREIT OP unit equivalents outstanding	—			1,835			—			1,835
Weighted average LTIP units outstanding	—			2,164			—			2,158
Weighted average subordinated performance units and DownREIT subordinated performance unit equivalents	—			21,721			—			20,245
Weighted average shares outstanding - diluted	44,223			73,531			43,814			70,763
Earnings (loss) per share - basic	$	0.05		$	0.32		$	0.07		$	0.42
Earnings (loss) per share - diluted	$	0.05		$	0.08		$	0.07		$	0.15

As discussed in Note 2, the Company allocates GAAP income (loss) utilizing the HLBV method, in which the Company allocates income or loss based on the change in each unitholders' claim on the net assets of its operating partnership at period end after adjusting for any distributions or contributions made during such period. Due to the stated liquidation priorities and because the HLBV method incorporates non-cash items such as depreciation expense, in any given period, income or loss may be allocated disproportionately to National Storage Affiliates Trust and noncontrolling interests, resulting in volatile fluctuations of basic and diluted earnings (loss) per share.

Outstanding equity interests of the operating partnership and DownREIT partnerships are considered potential common shares for purposes of calculating diluted earnings (loss) per share as the unitholders may, through the exercise of redemption rights, obtain common shares, subject to various restrictions. Basic earnings per share is calculated based on the weighted average number of common shares outstanding during the period. Diluted earnings per share is calculated by further adjusting for the dilutive impact using the treasury stock method for unvested LTIP units subject

18

to a service condition outstanding during the period and the if-converted method for any convertible securities outstanding during the period.

Generally, following certain lock-out periods, OP units in the operating partnership are redeemable for cash or, at the Company's option, exchangeable for common shares on a one-for-one basis, subject to certain adjustments and DownREIT OP units are redeemable for cash or, at the Company's option, exchangeable for OP units in the operating partnership on a one-for-one basis, subject to certain adjustments in each case.

LTIP units may also, under certain circumstances, be convertible into OP units on a one-for-one basis, which are then exchangeable for common shares as described above. Certain LTIP units vested prior to or upon the completion of the Company's initial public offering and certain LTIP units have vested upon the satisfaction of a service condition or will vest upon the satisfaction of future service and market conditions. Vested LTIP units and unvested LTIP units that vest based on a service or market condition are allocated income or loss in a similar manner as OP units. Unvested LTIP units subject to a service or market condition are evaluated for dilution using the treasury stock method. For the three and six months ended June 30, 2017, 410,825 unvested LTIP units that vest based on a service or market condition are excluded from the calculation of diluted earnings (loss) per share as they are not dilutive to earnings (loss) per share. In addition, certain LTIP units vest upon the future acquisition of properties sourced by PROs. For the three and six months ended June 30, 2017, 236,000 unvested LTIP units that vest upon the future acquisition of properties are excluded from the calculation of diluted earnings (loss) per share because the contingency for the units to vest has not been attained as of the end of the reported periods.

Subordinated performance units may also, under certain circumstances, be convertible into OP units which are exchangeable for common shares as described above, and DownREIT subordinated performance units may, under certain circumstances, be exchangeable for subordinated performance units on a one-for-one basis. Subordinated performance units are only convertible into OP units, after a two year lock-out period and then generally (i) at the holder’s election only upon the achievement of certain performance thresholds relating to the properties to which such subordinated performance units relate or (ii) at the Company's election upon a retirement event of a PRO that holds such subordinated performance units or upon certain qualifying terminations. Although subordinated performance units may only be convertible after a two year lock-out period, the Company assumes a hypothetical conversion of each subordinated performance unit (including each DownREIT subordinated performance unit) into OP units (with subsequently assumed redemption into common shares) for the purposes of calculating diluted weighted average common shares. This hypothetical conversion is calculated using historical financial information, and as a result, is not necessarily indicative of the results of operations, cash flows or financial position of the Company upon expiration of the two-year lock out period on conversions.

For the three and six months ended June 30, 2017, potential common shares totaling 50.3 million and 50.2 million, respectively, related to OP units, DownREIT OP units, subordinated performance units and DownREIT subordinated performance units have been excluded from the calculation of diluted earnings (loss) per share as they are not dilutive to earnings (loss) per share.

Participating securities, which consist of unvested restricted common shares, receive dividends equal to those received by common shares. The effect of participating securities for the periods presented above is calculated using the two-class method of allocating distributed and undistributed earnings.

19

10. RELATED PARTY TRANSACTIONS

Supervisory and Administrative Fees

The Company has entered into asset management agreements with the PROs to continue providing leasing, operating, supervisory and administrative services related to the Company's self storage properties. The asset management agreements generally provide for fees ranging from 5% to 6% of gross revenue for the managed self storage properties. During the three months ended June 30, 2017 and 2016, the Company incurred $3.5 million and $2.7 million, respectively, for supervisory and administrative fees to the PROs and during the six months ended June 30, 2017 and 2016, the Company incurred $6.8 million and $4.9 million, respectively, for supervisory and administrative fees to the PROs. Such fees are included in general and administrative expenses in the accompanying condensed consolidated statements of operations.

Affiliate Payroll Services

The employees responsible for operation of the self storage properties are employees of the PROs who charge the Company for the costs associated with the respective employees. For the three months ended June 30, 2017 and 2016, the Company incurred $5.9 million and $4.7 million, respectively, for payroll and related costs reimbursable to these affiliates, and for the six months ended June 30, 2017 and 2016, the Company incurred $11.7 million and $8.7 million, respectively, for payroll and related costs reimbursable to these affiliates. Such costs are included in property operating expenses in the accompanying condensed consolidated statements of operations.

Due Diligence Costs

During the three months ended June 30, 2017 and 2016, the Company incurred $0.2 million and $0.2 million, respectively, of expenses payable to certain PROs related to self storage property acquisitions sourced by the PROs, and during the six months ended June 30, 2017 and 2016, the Company incurred $0.3 million and $0.3 million, respectively, of expenses payable to certain PROs related to self storage property acquisitions sourced by the PROs. These expenses, which are based on the volume of transactions sourced by the PROs, are intended to reimburse the PROs for due diligence costs incurred in the sourcing and underwriting process. For the three and six months ended June 30, 2017, these due diligence costs are capitalized as part of the basis of the acquired self storage properties and for the three and six months ended June 30, 2016, these due diligence costs are included in acquisition costs in the accompanying condensed consolidated statements of operations.

Management Fees and Other Revenue

The unconsolidated real estate venture pays certain customary fees to the Company for managing and operating the unconsolidated real estate venture properties, including property management fees, call center fees, platform fees, acquisition fees and development management fees. During the three and six months ended June 30, 2017, the Company earned $2.1 million and $4.0 million, respectively, of management fees and other revenue for managing and operating the unconsolidated real estate venture. The fees are reported in management fees and other revenue in the accompanying condensed consolidated statements of operations.

11. COMMITMENTS AND CONTINGENCIES

Legal Proceedings

The Company is subject to litigation, claims, and assessments that may arise in the ordinary course of its business activities. Such matters include contractual matters, employment related issues, and regulatory proceedings. Although occasional adverse decisions or settlements may occur, the Company believes that the final disposition of such matters will not have a material adverse effect on the Company's financial position, results of operations, or liquidity.

20

12. FAIR VALUE MEASUREMENTS

Recurring Fair Value Measurements

The Company sometimes limits its exposure to interest rate fluctuations by entering into interest rate swap agreements. The interest rate swap agreements moderate the Company's exposure to interest rate risk by effectively converting the interest on variable rate debt to a fixed rate. The Company measures its interest rate swap derivatives at fair value on a recurring basis. The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges are recorded in accumulated other comprehensive income (loss) and are subsequently reclassified into earnings in the period that the hedged transaction affects earnings. The ineffective portion of the change in fair value of the derivatives is recognized directly into earnings.

Information regarding the Company's interest rate swaps measured at fair value, which are classified within Level 2 of the GAAP fair value hierarchy, is presented below (dollars in thousands):

Fair value at December 31, 2015	$	(972	)
Swap ineffectiveness	7
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss	909
Unrealized losses on interest rate swaps included in accumulated other comprehensive loss	(8,437		)
Fair value at June 30, 2016	$	(8,493	)
Fair value at December 31, 2016	$	8,159
Swap ineffectiveness	6
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss	1,530
Unrealized losses on interest rate swaps included in accumulated other comprehensive loss	(2,239		)
Fair value at June 30, 2017	$	7,456

As of June 30, 2017 and December 31, 2016, the Company had outstanding interest rate swaps with aggregate notional amounts of $595.0 million and $425.0 million, respectively, designated as cash flow hedges. As of June 30, 2017, the Company's swaps had a weighted average remaining term of approximately 4.0 years. The fair value of these swaps are presented within accounts payable and accrued liabilities and other assets in the Company's balance sheets, and the Company recognizes any changes in the fair value as an adjustment of accumulated other comprehensive income (loss) within equity to the extent of their effectiveness. If the forward rates at June 30, 2017 remain constant, the Company estimates that during the next 12 months, the Company would reclassify into earnings approximately $1.0 million of the unrealized losses included in accumulated other comprehensive income (loss). If market interest rates increase above the 1.51% weighted average fixed rate under these interest rate swaps the Company will benefit from net cash payments due to it from the counterparty to the interest rate swaps.

There were no transfers between levels during the six months ended June 30, 2017 and 2016. For financial assets and liabilities that utilize Level 2 inputs, the Company utilizes both direct and indirect observable price quotes, including LIBOR yield curves. The Company uses valuation techniques for Level 2 financial assets and liabilities which include LIBOR yield curves at the reporting date as well as assessing counterparty credit risk. Counterparties to these contracts are highly rated financial institutions. 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 the Company's derivatives utilize Level 3 inputs, such as estimates of current credit spreads, to evaluate the likelihood of default by the Company and the counterparties. As of June 30, 2017, the Company determined that the effect of credit valuation adjustments on the overall valuation of its derivative positions are not significant to the overall valuation of its derivatives. Therefore, the Company has determined that its derivative valuations are appropriately classified in Level 2 of the fair value hierarchy.

21

Fair Value Disclosures

The carrying values of cash and cash equivalents, restricted cash, trade receivables, and accounts payable and accrued liabilities reflected in the balance sheets at June 30, 2017 and December 31, 2016, approximate fair value due to the short term nature of these financial assets and liabilities. The carrying value of variable rate debt financing reflected in the balance sheets at June 30, 2017 and December 31, 2016 approximates fair value as the changes in their associated interest rates reflect the current market and credit risk is similar to when the loans were originally obtained.

The fair values of fixed rate mortgages were estimated using the discounted estimated future cash payments to be made on such debt; the discount rates used approximated current market rates for loans, or groups of loans, with similar maturities and credit quality (categorized within Level 2 of the fair value hierarchy). The combined principal balance of the Company's fixed rate mortgages payable was approximately $188.9 million as of June 30, 2017 with a fair value of approximately $201.8 million. In determining the fair value, the Company estimated a weighted average market interest rate of approximately 3.84%, compared to the weighted average contractual interest rate of 5.20%. The combined principal balance of the Company's fixed rate mortgages was approximately $201.7 million as of December 31, 2016 with a fair value of approximately $214.0 million. In determining the fair value as of December 31, 2016, the Company estimated a weighted average market interest rate of approximately 3.89%, compared to the weighted average contractual interest rate of 5.25%.

13. SUBSEQUENT EVENTS

In July 2017, the Company acquired four self storage properties for approximately $40.9 million. The four self storage properties were acquired for all cash consideration from third-party sellers and the Company assumed approximately $0.2 million of other working capital liabilities. In connection with these acquisitions, the Company incurred $0.1 million of expenses, payable to certain PROs, for due diligence costs related to the self storage properties sourced by the PROs.

22

ITEM 2. Management's Discussion and Analysis of Financial Condition and Results of Operations

Forward-Looking Statements

We make forward-looking statements in this report that are subject to risks and uncertainties. These forward-looking statements include information about possible or assumed future results of our business, financial condition, liquidity, results of operations, plans and objectives. When we use the words "believe," "expect," "anticipate," "estimate," "plan," "continue," "intend," "should," "may," or similar expressions, we intend to identify forward-looking statements.

The forward-looking statements contained in this report reflect our current views about future events and are subject to numerous known and unknown risks, uncertainties, assumptions, and changes in circumstances that may cause our actual results to differ significantly from those expressed in any forward-looking statement.

Statements regarding the following subjects, among others, may be forward-looking:

• market trends in our industry, interest rates, the debt and lending markets or the general economy;

• our business and investment strategy;

• the acquisition of properties, including the ability of our acquisitions to achieve underwritten capitalization rates and our ability to execute on our acquisition pipeline;

• the timing of acquisitions;

• our relationships with, and our ability and timing to attract additional, PROs;

• our ability to effectively align the interests of our PROs with us and our shareholders;

• the integration of our PROs and their managed portfolios into the Company, including into our financial and operational reporting infrastructure and internal control framework;

• our operating performance and projected operating results, including our ability to achieve market rents and occupancy levels, reduce operating expenditures and increase the sale of ancillary products and services;

• our ability to access additional off-market acquisitions;

• actions and initiatives of the U.S. federal, state and local government and changes to U.S. federal, state and local government policies and the execution and impact of these actions, initiatives and policies;

• the state of the U.S. economy generally or in specific geographic regions, states or municipalities;

• economic trends and economic recoveries;

• our ability to obtain and maintain financing arrangements on favorable terms;

• general volatility of the securities markets in which we participate;

• changes in the value of our assets;

• projected capital expenditures;

• the impact of technology on our products, operations, and business;

• the implementation of our technology and best practices programs (including our ability to effectively implement our integrated Internet marketing strategy);

• changes in interest rates and the degree to which our hedging strategies may or may not protect us from interest rate volatility;

• impact of and changes in governmental regulations, tax law and rates, accounting guidance and similar matters;

• our ability to continue to qualify and maintain our qualification as a REIT for U.S. federal income tax purposes;

• availability of qualified personnel;

23

• the timing of conversions of subordinated performance units in our operating partnership and subsidiaries of our operating partnership into OP units in our operating partnership, the conversion ratio in effect at such time and the impact of such convertibility on our diluted earnings (loss) per share;

• the risks of investing through joint ventures, including whether the anticipated benefits from a joint venture are realized or may take longer to realize than expected;

• estimates relating to our ability to make distributions to our shareholders in the future; and

• our understanding of our competition.

The forward-looking statements are based on our beliefs, assumptions and expectations of our future performance, taking into account all information currently available to us. Forward-looking statements are not predictions of future events. These beliefs, assumptions, and expectations can change as a result of many possible events or factors, not all of which are known to us. Readers should carefully review our financial statements and the notes thereto, as well as the sections entitled "Business," "Risk Factors," "Properties," and "Management's Discussion and Analysis of Financial Condition and Results of Operations," described in the Company's Annual Report on Form 10-K filed with the SEC on February 28, 2017 (the "Annual Report"), and the other documents we file from time to time with the Securities and Exchange Commission. If a change occurs, our business, financial condition, liquidity and results of operations may vary materially from those expressed in our forward-looking statements. Any forward-looking statement speaks only as of the date on which it is made. New risks and uncertainties arise over time, and it is not possible for us to predict those events or how they may affect us. Except as required by law, we are not obligated to, and do not intend to, update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Overview

National Storage Affiliates Trust is a fully integrated, self-administered and self-managed real estate investment trust organized in the state of Maryland on May 16, 2013. We have elected and believe we have qualified to be taxed as a REIT commencing with our taxable year ended December 31, 2015. We serve as the sole general partner of our operating partnership, a Delaware limited partnership formed on February 13, 2013 to conduct our business, which is focused on the ownership, operation, and acquisition of self storage properties located within the top 100 metropolitan statistical areas throughout the United States.

Our chairman and chief executive officer, Arlen D. Nordhagen, co-founded SecurCare Self Storage, Inc. in 1988 to invest in and manage self storage properties. While growing SecurCare to over 150 self storage properties, Mr. Nordhagen recognized a market opportunity for a differentiated public self storage REIT that would leverage the benefits of national scale by integrating multiple experienced regional self storage operators with local operational focus and expertise. We believe that his vision, which is the foundation of the Company, aligns the interests of our participating regional operators ("PROs"), with those of our public shareholders by allowing our PROs to participate alongside our shareholders in our financial performance and the performance of our PROs' managed portfolios. This structure offers our PROs a unique opportunity to serve as regional property managers for their managed portfolios and directly participate in the potential upside of those properties while simultaneously diversifying their investment to include a broader portfolio of self storage properties.

Our Structure

Our structure promotes operator accountability as subordinated performance units issued to our PROs in exchange for the contribution of their properties are entitled to distributions only after those properties satisfy minimum performance thresholds. In the event of a material reduction in operating cash flow, distributions on our subordinated performance units will be reduced before or disproportionately to distributions on our common shares held by our common shareholders. In addition, we expect our PROs will generally co-invest subordinated equity in the form of subordinated performance units in each acquisition that they source, and the value of these subordinated performance units will fluctuate with the performance of their managed portfolios. Therefore, our PROs are incentivized to select acquisitions that are expected to exceed minimum performance thresholds, thereby increasing the value of their subordinated equity stake. We expect that our shareholders will benefit from the higher levels of property performance that our PROs are incentivized to deliver.

Our PROs

The Company had eight PROs as of June 30, 2017: SecurCare, Northwest, Optivest, Guardian, Move It, Storage Solutions, Hide Away and Personal Mini. We seek to further expand our platform by continuing to recruit additional

24

established self storage operators, while integrating our operations through the implementation of centralized initiatives, including management information systems, revenue enhancement, and cost optimization programs. Our national platform allows us to capture cost savings by eliminating redundancies and utilizing economies of scale across the property management platforms of our PROs while also providing greater access to lower-cost capital.

Consolidated Properties

We seek to own properties that are well located in high quality sub-markets with highly accessible street access and attractive supply and demand characteristics, providing our properties with strong and stable cash flows that are less sensitive to the fluctuations of the general economy. Many of these markets have multiple barriers to entry against increased supply, including zoning restrictions against new construction and new construction costs that we believe are higher than our properties' fair market value.

As of June 30, 2017, we owned a geographically diversified portfolio of 394 self storage properties, located in 21 states, comprising approximately 23.9 million rentable square feet, configured in approximately 190,000 storage units. Of these properties, 241 were acquired by us from our PROs and 153 were acquired by us from third-party sellers.

During the six months ended June 30, 2017, we acquired 15 self storage properties with an aggregate fair value of $101.9 million, comprising approximately 0.9 million rentable square feet, configured in approximately 7,200 storage units. Of these acquisitions, six were acquired by us from our PROs and nine were acquired by us from third-party sellers.

During the six months ended June 30, 2017, the Company sold three self storage properties to unrelated third parties for $15.6 million. These self storage properties comprised approximately 0.2 million rentable square feet configured in approximately 1,200 storage units.

Our Unconsolidated Real Estate Venture

We seek to opportunistically partner with institutional funds and other institutional investors to acquire attractive portfolios utilizing a promoted return structure. We believe there is significant opportunity for continued external growth by partnering with institutional investors seeking to deploy capital in the self storage industry.

As of June 30, 2017, our unconsolidated real estate venture, in which we have a 25% ownership interest, owned and operated a portfolio of 70 properties containing approximately 4.9 million rentable square feet, configured in approximately 39,000 storage units and located across 13 states.

During the six months ended June 30, 2017, our unconsolidated real estate venture acquired four self storage properties with an aggregate fair value of $49.8 million, comprising approximately 0.3 million rentable square feet, configured in approximately 3,100 storage units.

Our Property Management Platform

Through our property management platform, we direct, manage and control the day-to-day operations and affairs of the unconsolidated real estate venture and earn certain customary fees for managing and operating the properties. In addition, we provide tenant warranty protection to tenants at the unconsolidated real estate venture properties in exchange for half of all proceeds from the tenant warranty protection program at each unconsolidated real estate venture property.

Results of Operations

When reviewing our results of operations it is important to consider the timing of acquisition activity. We acquired 15 self storage properties during the six months ended June 30, 2017 and 107 self storage properties during the year ended December 31, 2016. As a result of these and other factors, we do not believe that our historical results of operations discussed and analyzed below are comparable or necessarily indicative of our future results of operations or cash flows.

To help analyze the operating performance of our self storage properties, we also discuss and analyze operating results relating to our same store portfolio. Our same store portfolio is defined as those properties owned and operated for the entirety of the applicable periods presented, excluding any properties sold or expected to be sold or where we completed a storage space expansion which caused the property's year-over-year operating results to no longer be comparable. As of June 30, 2017, our same store portfolio consisted of 277 self storage properties which consists of only those properties that were included in our condensed consolidated financial statements since January 1, 2016, excluding two properties that we disposed of during the six months ended June 30, 2017.

25

The following discussion and analysis of the results of our operations and financial condition should be read in conjunction with the accompanying condensed consolidated financial statements in Item 1. Certain figures, such as interest rates and other percentages, included in this section have been rounded for ease of presentation. Percentage figures included in this section have not in all cases been calculated on the basis of such rounded figures but on the basis of such amounts prior to rounding. For this reason, percentage amounts in this section may vary slightly from those obtained by performing the same calculations using the figures in our condensed consolidated financial statements or in the associated text. Certain other amounts that appear in this section may similarly not sum due to rounding.

Three Months Ended June 30, 2017 compared to the Three Months Ended June 30, 2016

Net income was $15.6 million for the three months ended June 30, 2017, compared to $6.0 million for the three months ended June 30, 2016, an increase of $9.6 million. The increase was primarily due to an increase in net operating income ("NOI") resulting from an additional 80 self storage properties acquired between July 1, 2016 and June 30, 2017, gains from the sale of two self storage properties and same store NOI growth, partially offset by increases in depreciation and amortization, interest expense and general and administrative expenses. For a description of NOI, see "Non-GAAP Financial measures – NOI". The following table illustrates the changes in rental revenue, other property-related revenue, management fees and other revenue, property operating expenses, and other expenses for the three months ended June 30, 2017 compared to the three months ended June 30, 2016 (dollars in thousands):

	Three Months Ended June 30,
	2017			2016			Change
Rental revenue
Same store portfolio	$	41,293		$	39,039		$	2,254
Non-same store portfolio	18,861			6,745			12,116
Total rental revenue	60,154			45,784			14,370
Other property-related revenue
Same store portfolio	1,394			1,303			91
Non-same store portfolio	651			197			454
Total other property-related revenue	2,045			1,500			545
Property operating expenses
Same store portfolio	13,016			12,966			50
Non-same store portfolio	6,787			2,491			4,296
Total property operating expenses	19,803			15,457			4,346
Net operating income
Same store portfolio	29,671			27,376			2,295
Non-same store portfolio	12,725			4,451			8,274
Total net operating income	42,396			31,827			10,569
Management fees and other revenue	2,142			—			2,142
General and administrative expenses	(7,405		)	(4,837		)	(2,568		)
Depreciation and amortization	(17,800		)	(13,088		)	(4,712		)
Income from operations	19,333			13,902			5,431
Other (expense) income
Interest expense	(8,160		)	(5,844		)	(2,316		)
Loss on early extinguishment of debt	—			(136		)	136
Equity in losses of unconsolidated real estate venture	(765		)	—			(765		)
Acquisition costs	(167		)	(1,708		)	1,541
Non-operating expense	(14		)	(57		)	43
Gain on sale of self storage properties	5,637			—			5,637
Other expense	(3,469		)	(7,745		)	4,276
Income before income taxes	15,864			6,157			9,707
Income tax expense	(288		)	(112		)	(176		)

26

Net income	15,576			6,045		9,531
Net (income) loss attributable to noncontrolling interests	(13,209		)	1,325		(14,534		)
Net income attributable to National Storage Affiliates Trust	$	2,367		$	7,370	$	(5,003	)

Total Revenue

Our total revenue increased by $17.1 million, or 36.1%, for the three months ended June 30, 2017, as compared to the three months ended June 30, 2016. This increase was primarily attributable to incremental revenue from 80 self storage properties we acquired between July 1, 2016 and June 30, 2017, increased market rates and fees, regular rental increases for in-place tenants, and management fees and other revenue earned from our unconsolidated real estate venture, partially offset by a decrease in total portfolio average occupancy from 90.4% to 89.4%. Average occupancy is calculated based on the average of the month-end occupancy immediately preceding the period presented and the month-end occupancies included in the respective period presented.

Rental Revenue

Rental revenue increased by $14.4 million, or 31.4%, for the three months ended June 30, 2017, as compared to the three months ended June 30, 2016. The increase in rental revenue was due to a $12.1 millionincrease in non-same store rental revenue which was primarily attributable to incremental rental revenue of $10.9 million from 70 self storage properties acquired between July 1, 2016 and March 31, 2017, and $0.7 million from 10 self storage properties acquired during the three months ended June 30, 2017. Same store portfolio rental revenues increased$2.3 million, or 5.8%, due to a 6.3%increase, from $10.86 to $11.54, in same store rental revenue divided by average occupied square feet ("rental revenue per occupied square foot"), driven primarily by increased contractual lease rates and fees.

Other Property-Related Revenue

Other property-related revenue represents ancillary income from our self storage properties, such as tenant insurance-related access fees and commissions and sales of storage supplies. Other property-related revenue increased by $0.5 million, or 36.3%, for the three months ended June 30, 2017, as compared to the three months ended June 30, 2016. This increase resulted from a $0.5 millionincrease in non-same store other property-related revenue which was primarily attributable to $0.4 million incremental other property-related revenue from 70 self storage properties acquired between July 1, 2016 and March 31, 2017, and less than $0.1 million from 10 self storage properties acquired during the three months ended June 30, 2017.

Management Fees and Other Revenue

During the three months ended June 30, 2017, we earned $2.1 million of management and other fees for managing and operating the unconsolidated real estate venture. The unconsolidated real estate venture pays certain customary fees to us for managing and operating the unconsolidated real estate venture properties, including property management fees, call center fees, platform fees and acquisition fees.

Total Operating Expenses

Total operating expenses for the three months ended June 30, 2017 were $45.0 million compared to $33.4 million for the three months ended June 30, 2016, an increase of $11.6 million, or 34.8%. As discussed below, this change was primarily due to an increase of $4.3 million in property operating expenses, $2.6 million in general and administrative expenses, and $4.7 million in depreciation and amortization.

Property Operating Expenses

Property operating expenses were $19.8 million for the three months ended June 30, 2017 compared to $15.5 million for the three months ended June 30, 2016, an increase of $4.3 million, or 28.1%. This increase resulted from a $4.3 millionincrease in non-same store property operating expenses that was primarily attributable to incremental property operating expenses of $3.9 million from 70 self storage properties acquired between July 1, 2016 and March 31, 2017 and $0.3 million from 10 self storage properties acquired during the three months ended June 30, 2017. In addition, same store portfolio property operating expenses increased$0.1 million, or 0.4%, due to increases in property taxes and bad debt expense, partially offset by decreases in advertising expenses and personnel costs.

27

General and Administrative Expenses

General and administrative expenses increased$2.6 million, or 53.1%, for the three months ended June 30, 2017, compared to the three months ended June 30, 2016. This increase was attributable to increases in supervisory and administrative fees charged by our PROs of $0.8 million primarily as a result of incremental fees related to the 80 properties we acquired from July 1, 2016 to June 30, 2017, costs related to our property management platform of $0.9 million, salaries and benefits of $0.4 million and equity-based compensation expense of $0.3 million.

Depreciation and Amortization

Depreciation and amortization increased$4.7 million, or 36.0%, for the three months ended June 30, 2017, compared to the three months ended June 30, 2016. This increase was primarily attributable to incremental depreciation expense of $3.5 million from 70 self storage properties acquired between July 1, 2016 and March 31, 2017, and $0.2 million from 10 self storage properties acquired during the three months ended June 30, 2017. In addition, amortization of customer in-place leases increased $0.3 million from $2.9 million for the three months ended June 30, 2016 to $3.2 million for the three months ended June 30, 2017. Customer in-place leases are amortized over the 12-month period following the respective acquisition dates of our self storage properties. As of June 30, 2017, the unamortized balance of customer in-place leases totaled $4.7 million.

Interest Expense

Interest expense increased$2.3 million, or 39.6%, for the three months ended June 30, 2017, compared to the three months ended June 30, 2016. The increase in interest expense was primarily attributable to increases in outstanding borrowings under our credit facility and higher interest rates on the Revolver, a new term loan facility borrowing during 2016 and a $0.2 million decrease in amortization of debt premiums.

Loss On Early Extinguishment of Debt

Loss on early extinguishment of debt decreased $0.1 million for the three months ended June 30, 2017, compared to the three months ended June 30, 2016. During the three months ended June 30, 2016, in connection with the amendment to our credit facility, one of the lenders that was included in the syndicated group of lenders prior to the amendment is no longer a participating lender following the amendment, which constitutes an extinguishment of debt for accounting purposes. As a result, we wrote off $0.1 million of unamortized debt issuance costs, which is the amount attributed to the lender no longer included in the lending syndicate.

Equity In Losses Of Unconsolidated Real Estate Venture

During the three months ended June 30, 2017, we recorded $0.8 million of equity in losses from our unconsolidated real estate venture. Equity in losses of unconsolidated real estate venture represents our share of earnings and losses earned through our 25% ownership interest in the unconsolidated real estate venture. The unconsolidated real estate venture recorded a net loss of $3.1 million during the three months ended June 30, 2017, primarily due to NOI of $8.6 million, offset by $7.7 million of depreciation and amortization, $2.8 million of interest expense, and $1.2 million of supervisory, administrative, acquisition and other expenses.

Acquisition Costs

Acquisition costs decreased$1.5 million, or 90.2%, for the three months ended June 30, 2017, compared to the three months ended June 30, 2016. This decrease was due to a reduction in the number of properties acquired and the adoption of ASU 2017-01 during the six months ended June 30, 2017. As a result of the adoption of ASU 2017-01, the self storage properties acquired during the three months ended June 30, 2017 were accounted for as asset acquisitions, and accordingly, $0.6 million of acquisition costs related to the self storage property acquisitions during the three months ended June 30, 2017 were capitalized as part of the basis of the acquired properties.

Gain On Sale of Self Storage Properties

Gain on sale of self storage properties increased$5.6 million for the three months ended June 30, 2017, compared to the three months ended June 30, 2016. This increase resulted from the sale of two self storage properties during the three months ended June 30, 2017 for gross proceeds of $10.3 million.

28

Income Tax Expense

Income tax expense increased$0.2 million, or 157.1%, for the three months ended June 30, 2017, compared to the three months ended June 30, 2016. The increase in income tax expense was primarily related to growth in the Company's portfolio contributing to increases in certain state and local taxes that are considered income-based taxes and increases in the Company's tax provision for its taxable REIT subsidiary, through which the Company provides management and other services to the unconsolidated real estate venture as well as other activities.

Net Income (Loss) Attributable to Noncontrolling Interests

As discussed in Note 2 in Item 1, we allocate GAAP income (loss) utilizing the hypothetical liquidation at book value ("HLBV") method, in which we allocate income or loss based on the change in each unitholders' claim on the net assets of our operating partnership at period end after adjusting for any distributions or contributions made during such period.

Due to the stated liquidation priorities and because the HLBV method incorporates non-cash items such as depreciation expense, in any given period, income or loss may be allocated disproportionately to noncontrolling interests. Net income attributable to noncontrolling interests was $13.2 million for the three months ended June 30, 2017, compared to a net loss of $1.3 million for the three months ended June 30, 2016.

Six Months Ended June 30, 2017 compared to the Six Months Ended June 30, 2016

Net income was $22.8 million for the six months ended June 30, 2017, compared to $10.8 million for the six months ended June 30, 2016, an increase of $12.0 million. The increase was primarily due to an increase in NOI resulting from an additional 80 self storage properties we acquired between July 1, 2016 and June 30, 2017, gains from the sale of two self storage properties and same store NOI growth, partially offset by increases in depreciation and amortization, interest expense and general and administrative expenses.

The following table illustrates the changes in rental revenue, other property-related revenue, management fees and other revenue, property operating expenses, and other expenses for the six months ended June 30, 2017 compared to the six months ended June 30, 2016 (dollars in thousands):

	Six Months Ended June 30,
	2017			2016			Change
Rental revenue
Same store portfolio	$	81,166		$	76,538		$	4,628
Non-Same store portfolio	36,832			7,747			29,085
Total rental revenue	117,998			84,285			33,713
Other property-related revenue
Same store portfolio	2,704			2,427			277
Non-Same store portfolio	1,222			221			1,001
Total other property-related revenue	3,926			2,648			1,278
Property operating expenses
Same store portfolio	26,118			25,859			259
Non-Same store portfolio	13,434			2,875			10,559
Total property operating expenses	39,552			28,734			10,818
Net operating income
Same store portfolio	57,752			53,106			4,646
Non-same store portfolio	24,620			5,093			19,527
Total net operating income	82,372			58,199			24,173
Management fees and other revenue	3,980			—			3,980
General and administrative expenses	(14,586		)	(9,172		)	(5,414		)
Depreciation and amortization	(36,483		)	(23,980		)	(12,503		)
Income from operations	35,283			25,047			10,236
Other (expense) income

29

	Six Months Ended June 30,
	2017			2016			Change
Interest expense	(15,631		)	(10,785		)	(4,846		)
Loss on early extinguishment of debt	—			(136		)	136
Equity in losses of unconsolidated real estate venture	(1,550		)	—			(1,550		)
Acquisition costs	(311		)	(2,996		)	2,685
Non-operating expense	(66		)	(62		)	(4		)
Gain on sale of self storage properties	5,637			—			5,637
Other expense	(11,921		)	(13,979		)	2,058
Income before income taxes	23,362			11,068			12,294
Income tax expense	(605		)	(221		)	(384		)
Net income	22,757			10,847			11,910
Net (income) attributable to noncontrolling interests	(19,835		)	(1,267		)	(18,568		)
Net income attributable to National Storage Affiliates Trust	$	2,922		$	9,580		$	(6,658	)

Total Revenue

Our total revenue increased by $39.0 million, or 44.8%, for the six months ended June 30, 2017, as compared to the six months ended June 30, 2016. This increase was primarily attributable to incremental rental revenue from 80 self storage properties we acquired between July 1, 2016 and June 30, 2017, increased market rates and fees, regular rental increases for in-place tenants, and management fees and other revenue earned from our unconsolidated real estate venture, partially offset by a decrease in average total portfolio occupancy from 89.6% to 88.9%.

Rental Revenue

Rental revenue increased by $33.7 million, or 40.0%, for the six months ended June 30, 2017, as compared to the six months ended June 30, 2016. The increase in rental revenue was primarily due to a $29.1 millionincrease in non-same store rental revenue which was attributable to incremental rental revenue of $20.4 million from 65 self storage properties acquired between July 1, 2016 and December 31, 2016, and $1.9 million from 15 self storage properties acquired during the six months ended June 30, 2017. Same store portfolio rental revenues increased$4.6 million, or 6.0%, due to a 6.2%increase, from $10.76 to $11.43, in same store rental revenue per occupied square foot, driven primarily by a combination of increased contractual lease rates and fees.

Other Property-Related Revenue

Other property-related revenue represents ancillary income from our self storage properties, such as tenant insurance-related access fees and commissions and sales of storage supplies. Other property-related revenue increased by $1.3 million, or 48.3%, for the six months ended June 30, 2017, as compared to the six months ended June 30, 2016. This increase primarily resulted from a $1.0 millionincrease in non-same store other property-related revenue which was attributable to incremental other property-related revenue of $0.8 million from 65 self storage properties acquired between July 1, 2016 and December 31, 2016, and less than $0.1 million from 15 self storage properties acquired during the six months ended June 30, 2017.

Management Fees and Other Revenue

During the six months ended June 30, 2017, we earned $4.0 million of management and other fees for managing and operating the unconsolidated real estate venture properties. The unconsolidated real estate venture pays certain customary fees to us for managing and operating the unconsolidated real estate venture properties, including property management fees, call center fees, platform fees and acquisition fees.

Total Operating Expenses

Total operating expenses increased $28.7 million, or 46.4%, for the six months ended June 30, 2017, compared to the six months ended June 30, 2016. As discussed below, this change was primarily due to an increase of $10.8 million in property operating expenses, $5.4 million in general and administrative expenses, and $12.5 million in depreciation and amortization.

30

Property Operating Expenses

Property operating expenses increased $10.8 million, or 37.6%, for the six months ended June 30, 2017 compared to the six months ended June 30, 2016. This increase resulted from a $10.6 millionincrease in non-same store property operating expenses attributable to incremental property operating expenses of $7.5 million from 65 self storage properties acquired between July 1, 2016 and December 31, 2016, and $0.7 million from 15 self storage properties acquired during the six months ended June 30, 2017. In addition, same store portfolio property operating expenses increased$0.3 million, or 1.0%, due to increases in property taxes, repairs and maintenance and bad debt expense, partially offset by decreases in advertising costs and personnel and related costs.

General and Administrative Expenses

General and administrative expenses increased$5.4 million, or 59.0%, for the six months ended June 30, 2017, compared to the six months ended June 30, 2016. This increase was attributable to increases in supervisory and administrative fees charged by our PROs of $2.0 million primarily as a result of incremental fees related to the 80 properties we acquired from July 1, 2016 to June 30, 2017, costs related to our property management platform of $1.7 million, salaries and benefits of $0.9 million and equity-based compensation expense of $0.7 million.

Depreciation and Amortization

Depreciation and amortization increased$12.5 million, or 52.1%, for the six months ended June 30, 2017, compared to the six months ended June 30, 2016. This increase was attributable to incremental depreciation expense of $6.5 million from 65 self storage properties acquired between July 1, 2016 and December 31, 2016, and $0.5 million from 15 self storage properties acquired during the six months ended June 30, 2017. In addition, amortization of customer in-place leases increased $2.4 million from $5.1 million for the six months ended June 30, 2016 to $7.5 million for the six months ended June 30, 2017.

Interest Expense

Interest expense increased$4.8 million, or 44.9%, for the six months ended June 30, 2017, compared to the six months ended June 30, 2016. The increase in interest expense was primarily due to increases in outstanding borrowings under our credit facility and higher interest rates on the Revolver, a new term loan facility borrowing during 2016, the assumption of fixed rate mortgages in connection with self storage property acquisitions and a $0.2 million decrease in amortization of debt premiums.

Loss On Early Extinguishment of Debt

Loss on early extinguishment of debt increased$0.1 million for the six months ended June 30, 2017, compared to the six months ended June 30, 2016. During the six months ended June 30, 2016, in connection with an amendment to our credit facility, one of the lenders that was included in the syndicated group of lenders prior to the amendment is no longer a participating lender following the amendment, which constitutes an extinguishment of debt for accounting purposes. As a result, we wrote off $0.1 million of unamortized debt issuance costs, which is the amount attributed to the lender no longer included in the lending syndicate.

Equity In Losses Of Unconsolidated Real Estate Venture

During the six months ended June 30, 2017, we recorded $1.6 million of equity in losses from our unconsolidated real estate venture. Equity in losses of unconsolidated real estate venture represents our share of earnings and losses earned through our 25% ownership interest in the unconsolidated real estate venture. The unconsolidated real estate venture recorded net losses of $6.2 million during the six months ended June 30, 2017, primarily due to NOI of $17.1 million, offset by $15.2 million of depreciation and amortization, $5.6 million of interest expense and $2.5 million of supervisory, administrative, acquisition and other expenses.

Acquisition Costs

Acquisition costs decreased$2.7 million, or 89.6%, for the six months ended June 30, 2017, compared to the six months ended June 30, 2016. This decrease was due to a reduction in the number of properties acquired and the adoption of ASU 2017-01 during the six months ended June 30, 2017. As a result of the adoption of ASU 2017-01, the self storage properties acquired during the six months ended June 30, 2017 were accounted for as asset acquisitions, and accordingly, $0.8 million of acquisition costs related to the self storage property acquisitions during the six months ended June 30, 2017 were capitalized as part of the basis of the acquired properties.

31

Gain On Sale of Self Storage Properties

Gain on sale of self storage properties increased$5.6 million for the six months ended June 30, 2017, compared to the six months ended June 30, 2016. This increase resulted from the sale of two self storage properties during the six months ended June 30, 2017 for gross proceeds of $10.3 million.

Income Tax Expense

Income tax expense increased$0.4 million, or 173.8%, for the six months ended June 30, 2017, compared to the six months ended June 30, 2016. The increase in income tax expense was primarily related to growth in the Company's portfolio contributing to increases in certain state and local taxes that are considered income-based taxes and increases in the Company's tax provision for its taxable REIT subsidiary, through which the Company provides management and other services to the unconsolidated real estate venture as well as other activities.

Net Loss Attributable to Noncontrolling Interests

As discussed in Note 2 in Item 1, we allocate GAAP income (loss) utilizing the HLBV method, in which we allocate income or loss based on the change in each unitholders' claim on the net assets of our operating partnership at period end after adjusting for any distributions or contributions made during such period.

Due to the stated liquidation priorities and because the HLBV method incorporates non-cash items such as depreciation expense, in any given period, income or loss may be allocated disproportionately to noncontrolling interests. Net income attributable to noncontrolling interests was $19.8 million for the six months ended June 30, 2017, compared to $1.3 million for the six months ended June 30, 2016.

Non-GAAP Financial Measures

FFO and Core FFO

Funds from operations, or FFO, is a widely used performance measure for real estate companies and is provided here as a supplemental measure of our operating performance. The April 2002 National Policy Bulletin of NAREIT, which we refer to as the White Paper, as amended, defines FFO as net income (loss) (as determined under GAAP), excluding gains (or losses) from sales of real estate and related impairment charges, plus real estate depreciation and amortization, and after adjustments for unconsolidated partnerships and joint ventures. We include amortization of customer in-place leases in real estate depreciation and amortization in the calculation of FFO because we believe the amortization of customer in-place leases is analogous to real estate depreciation, as the value of such intangibles is inextricably connected to the real estate acquired. Distributions declared on subordinated performance units and DownREIT subordinated performance units represent our allocation of FFO to noncontrolling interests held by subordinated performance unitholders and DownREIT subordinated performance unitholders for the purpose of calculating FFO attributable to common shareholders, OP unitholders, and LTIP unitholders. We define Core FFO as FFO, as further adjusted to eliminate the impact of certain items that we do not consider indicative of our core operating performance. These further adjustments consist of acquisition costs, organizational and offering costs, gains on debt forgiveness, gains (losses) on early extinguishment of debt and after adjustments for unconsolidated partnerships and joint ventures.

Management uses FFO and Core FFO as key performance indicators in evaluating the operations of our properties. Given the nature of our business as a real estate owner and operator, we consider FFO and Core FFO as key supplemental measures of our operating performance that are not specifically defined by GAAP. We believe that FFO and Core FFO are useful to management and investors as a starting point in measuring our operational performance because FFO and Core FFO exclude various items included in net income (loss) that do not relate to or are not indicative of our operating performance such as gains (or losses) from sales of self storage properties and depreciation, which can make periodic and peer analyses of operating performance more difficult. Our computation of FFO and Core FFO may not be comparable to FFO reported by other REITs or real estate companies.

FFO and Core FFO should be considered in addition to, but not as a substitute for, other measures of financial performance reported in accordance with GAAP, such as total revenues, operating income and net income (loss). FFO and Core FFO do not represent cash generated from operating activities determined in accordance with GAAP and are not a measure of liquidity or an indicator of our ability to make cash distributions. We believe that to further understand our performance, FFO and Core FFO should be compared with our reported net income (loss) and considered in addition to cash flows computed in accordance with GAAP, as presented in our condensed consolidated financial statements.

32

The following table presents a reconciliation of net income (loss) to FFO and Core FFO for the three and six months ended June 30, 2017 and 2016 (in thousands, except per share and unit amounts):

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Net income	$	15,576		$	6,045		$	22,757		$	10,847
Add (subtract):
Real estate depreciation and amortization	17,343			12,935			35,586			23,714
Company's share of unconsolidated real estate venture real estate depreciation and amortization	1,918			—			3,790			—
Gain on sale of self storage properties	(5,637		)	—			(5,637		)	—
FFO attributable to subordinated performance unitholders (1)	(6,903		)	(6,150		)	(13,044		)	(10,493		)
FFO attributable to common shareholders, OP unitholders, and LTIP unitholders	22,297			12,830			43,452			24,068
Add:
Acquisition costs	167			1,708			311			2,996
Company's share of unconsolidated real estate venture acquisition costs	2			—			21			—
Loss on early extinguishment of debt	—			136			—			136
Core FFO attributable to common shareholders, OP unitholders, and LTIP unitholders	$	22,466		$	14,674		$	43,784		$	27,200
Weighted average shares and units outstanding - FFO and Core FFO:(2)
Weighted average shares outstanding - basic	44,223			23,078			43,814			23,041
Weighted average restricted common shares outstanding	27			19			22			18
Weighted average OP units outstanding	25,628			24,733			25,793			23,484
Weighted average DownREIT OP unit equivalents outstanding	1,835			1,835			1,835			1,835
Weighted average LTIP units outstanding	1,224			2,558			1,345			2,507
Total weighted average shares and units outstanding - FFO and Core FFO	72,937			52,223			72,809			50,885
FFO per share and unit	$	0.31		$	0.25		$	0.60		$	0.47
Core FFO per share and unit	$	0.31		$	0.28		$	0.60		$	0.53

(1) Amounts represent distributions declared for subordinated performance unitholders and DownREIT subordinated performance unitholders for the periods presented.

(2) NSA combines OP units and DownREIT OP units with common shares because, after the applicable lock-out periods, OP units in the Company's operating partnership are redeemable for cash or, at NSA's option, exchangeable for common shares on a one-for-one basis and DownREIT OP units are also redeemable for cash or, at NSA's option, exchangeable for OP units in our operating partnership on a one-for-one basis, subject to certain adjustments in each case. Subordinated performance units, DownREIT subordinated performance units, and LTIP units may also, under certain circumstances, be convertible into or exchangeable for common shares (or other units that are convertible into or exchangeable for common shares). See footnote⁽¹⁾ in the following table for additional discussion of subordinated performance units, DownREIT subordinated performance units, and LTIP units in the calculation of FFO and Core FFO per share and unit.

33

The following table presents a reconciliation of earnings (loss) per share - diluted to FFO and Core FFO per share and unit for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Earnings (loss) per share - diluted	$	0.05		$	0.08		$	0.07		$	0.15
Impact of the difference in weighted average number of shares(1)	(0.02		)	0.04			(0.02		)	0.06
Impact of GAAP accounting for noncontrolling interests, two-class method and treasury stock method(2)	0.18			—			0.27			—
Add real estate depreciation and amortization	0.24			0.25			0.49			0.47
Add Company's share of unconsolidated venture real estate depreciation and amortization	0.03			—			0.05			—
Subtract gain on sale of self storage properties	(0.08		)	—			(0.08		)	—
FFO attributable to subordinated performance unitholders	(0.09		)	(0.12		)	(0.18		)	(0.21		)
FFO per share and unit	0.31			0.25			0.60			0.47
Add acquisition costs, Company's share of unconsolidated real estate venture acquisition costs, and loss on early extinguishment of debt	—			0.03			—			0.06
Core FFO per share and unit	$	0.31		$	0.28		$	0.60		$	0.53

(1) Adjustment accounts for the difference between the weighted average number of shares used to calculate diluted earnings per share and the weighted average number of shares used to calculate FFO and Core FFO per share and unit. Diluted earnings per share is calculated using the two-class method for the company's restricted common shares, the treasury stock method for certain unvested LTIP units, and includes the assumption of a hypothetical conversion of subordinated performance units and DownREIT subordinated performance units into OP units, even though such units may only be convertible into OP units (i) after a lock-out period and (ii) upon certain events or conditions. For additional information about the conversion of subordinated performance units, DownREIT subordinated performance units and LTIP units into OP units, see Note 9 in Item 1. The computation of weighted average shares and units for FFO and Core FFO per share and unit includes all restricted common shares and LTIP units that participate in distributions and excludes all subordinated performance units and DownREIT subordinated performance units because their effect has been accounted for through the allocation of FFO to the related unitholders based on distributions declared.

(2) Represents the effect of adjusting the numerator to consolidated net income (loss) prior to GAAP allocations for noncontrolling interests and the application of the two-class method and treasury stock method, as described in footnote ⁽¹⁾.

NOI

We define NOI as net income (loss), as determined under GAAP, plus general and administrative expenses, depreciation and amortization, interest expense, loss on early extinguishment of debt, equity in earnings (losses) of unconsolidated real estate ventures, acquisition costs, organizational and offering expenses, income tax expense, impairment of long-lived assets, losses on the sale of properties and non-operating expense and by subtracting management fees and other revenue, gains on sale of properties, debt forgiveness, and non-operating income. NOI is not a measure of performance calculated in accordance with GAAP.

We believe NOI is useful to investors in evaluating our operating performance because:

• NOI is one of the primary measures used by our management and our PROs to evaluate the economic productivity of our properties, including our ability to lease our properties, increase pricing and occupancy and control our property operating expenses;

• NOI is widely used in the real estate industry and the self storage industry to measure the performance and value of real estate assets without regard to various items included in net income that do not relate to or are not indicative of operating performance, such as depreciation and amortization, which can vary depending upon accounting methods, the book value of assets, and the impact of our capital structure; and

34

• We believe NOI helps our investors to meaningfully compare the results of our operating performance from period to period by removing the impact of our capital structure (primarily interest expense on our outstanding indebtedness) and depreciation of the cost basis of our assets from our operating results.

There are material limitations to using a non-GAAP measure such as NOI, including the difficulty associated with comparing results among more than one company and the inability to analyze certain significant items, including depreciation and interest expense, that directly affect our net income (loss). We compensate for these limitations by considering the economic effect of the excluded expense items independently as well as in connection with our analysis of net income (loss). NOI should be considered in addition to, but not as a substitute for, other measures of financial performance reported in accordance with GAAP, such as total revenues, income from operations and net loss.

The following table presents a reconciliation of net income (loss) to NOI for the three and six months ended June 30, 2017 and 2016 (dollars in thousands):

	Three Months Ended June 30,					Six Months Ended June 30,
	2017			2016		2017			2016
Net income	$	15,576		$	6,045	$	22,757		$	10,847
(Subtract) Add:
Management fees and other revenue	(2,142		)	—		(3,980		)	—
General and administrative expenses	7,405			4,837		14,586			9,172
Depreciation and amortization	17,800			13,088		36,483			23,980
Interest expense	8,160			5,844		15,631			10,785
Equity in losses of unconsolidated real estate venture	765			—		1,550			—
Loss on early extinguishment of debt	—			136		—			136
Acquisition costs	167			1,708		311			2,996
Income tax expense	288			112		605			221
Gain on sale of self storage properties	(5,637		)	—		(5,637		)	—
Non-operating expense	14			57		66			62
Net Operating Income	$	42,396		$	31,827	$	82,372		$	58,199

Our consolidated NOI shown in the table above does not include our proportionate share of the unconsolidated real estate venture's net operating income. For additional information about our unconsolidated real estate venture see Note 5 to the condensed consolidated financial statements in Item 1.

EBITDA and Adjusted EBITDA

We define EBITDA as net income (loss), as determined under GAAP, plus interest expense, loss on early extinguishment of debt, income taxes, depreciation and amortization expense and the Company's share of unconsolidated real estate venture depreciation and amortization. We define Adjusted EBITDA as EBITDA plus acquisition costs, the Company's share of unconsolidated real estate venture acquisition costs, organizational and offering expenses, equity-based compensation expense, losses on sale of properties, and impairment of long-lived assets; and by subtracting gains on sale of properties and debt forgiveness. These further adjustments eliminate the impact of items that we do not consider indicative of our core operating performance. In evaluating EBITDA and Adjusted EBITDA, you should be aware that in the future we may incur expenses that are the same as or similar to some of the adjustments in this presentation. Our presentation of EBITDA and Adjusted EBITDA should not be construed as an inference that our future results will be unaffected by unusual or non-recurring items.

We present EBITDA and Adjusted EBITDA because we believe they assist investors and analysts in comparing our performance across reporting periods on a consistent basis by excluding items that we do not believe are indicative of our core operating performance. EBITDA and Adjusted EBITDA have limitations as an analytical tool. Some of these limitations are:

• EBITDA and Adjusted EBITDA do not reflect our cash expenditures, or future requirements, for capital expenditures, contractual commitments or working capital needs;

35

• EBITDA and Adjusted EBITDA do not reflect the significant interest expense, or the cash requirements necessary to service interest or principal payments, on our debts;

• although depreciation and amortization are non-cash charges, the assets being depreciated and amortized will often have to be replaced in the future, and EBITDA and Adjusted EBITDA do not reflect any cash requirements for such replacements;

• Adjusted EBITDA excludes equity-based compensation expense, which is and will remain a key element of our overall long-term incentive compensation package, although we exclude it as an expense when evaluating our ongoing operating performance for a particular period;

• EBITDA and Adjusted EBITDA do not reflect the impact of certain cash charges resulting from matters we consider not to be indicative of our ongoing operations; and

• other companies in our industry may calculate EBITDA and Adjusted EBITDA differently than we do, limiting its usefulness as a comparative measure.

We compensate for these limitations by considering the economic effect of the excluded expense items independently as well as in connection with our analysis of net income (loss). EBITDA and Adjusted EBITDA should be considered in addition to, but not as a substitute for, other measures of financial performance reported in accordance with GAAP, such as total revenues, income from operations, and net income (loss).

The following table presents a reconciliation of net income (loss) to EBITDA and Adjusted EBITDA for the three and six months ended June 30, 2017 and 2016 (dollars in thousands):

	Three Months Ended June 30,					Six Months Ended June 30,
	2017			2016		2017			2016
Net income	$	15,576		$	6,045	$	22,757		$	10,847
Add:
Depreciation and amortization	17,800			13,088		36,483			23,980
Company's share of unconsolidated real estate venture depreciation and amortization	1,918			—		3,790			—
Interest expense	8,160			5,844		15,631			10,785
Income tax expense	288			112		605			221
Loss on early extinguishment of debt	—			136		—			136
EBITDA	43,742			25,225		79,266			45,969
Add:
Acquisition costs	167			1,708		311			2,996
Company's share of unconsolidated real estate venture acquisition costs	2			—		21			—
Gain on sale of self storage properties	(5,637		)	—		(5,637		)	—
Equity-based compensation expense(1)	940			630		1,923			1,228
Adjusted EBITDA	$	39,214		$	27,563	$	75,884		$	50,193
(1) Equity-based compensation expense is a non-cash item that is included in general and administrative expenses in our consolidated statements of operations.

Liquidity and Capital Resources

Liquidity is the ability to meet present and future financial obligations. Our primary source of liquidity is cash flow from our operations. Additional sources are proceeds from equity and debt offerings, and debt financings including borrowings under our credit facility and Term Loan Facility (as defined below).

Our short-term liquidity requirements consist primarily of property operating expenses, property acquisitions, capital expenditures, general and administrative expenses, acquisition pursuit costs and principal and interest on our outstanding indebtedness. A further short-term liquidity requirement relates to distributions to our shareholders and

36

holders of OP units, subordinated performance units, DownREIT OP units and DownREIT subordinated performance units. We expect to fund short-term liquidity requirements from our operating cash flow, cash on hand and borrowings under our credit facility.

As discussed in Note 8 in Item 1, on February 8, 2017, we entered into an Increase Agreement with a syndicated group of lenders to increase the total borrowing capacity under the credit facility by $170.0 million for a total credit facility of $895.0 million, which included entry into a new $105.0 million Term Loan C. We continue to have an expansion option under the credit facility, which, if exercised in full, would provide for a total credit facility of $1.0 billion.

As of June 30, 2017, $235.0 million was outstanding under the Term Loan A with an effective interest rate of 2.60%, $155.0 million was outstanding under the Term Loan B with an effective interest rate of 3.24%, $105.0 million was outstanding under the Term Loan C with an effective interest rate of 3.71% and $181.0 million was outstanding under the Revolver with an effective interest rate of 2.62%. As of June 30, 2017, we would have had the capacity to borrow remaining Revolver commitments of $214.3 million while remaining in compliance with the credit facility's financial covenants.

For a summary of our financial covenants and additional detail regarding our credit facility, Term Loan Facility (as defined below), and fixed rate mortgage payables, please see Note 8 to the Company's most recent Annual Report on Form10-K filed with the Securities and Exchange Commission.

Our long-term liquidity needs consist primarily of the repayment of debt, property acquisitions, and capital expenditures. We acquire properties through the use of cash, OP units and subordinated performance units in our operating partnership or DownREIT partnerships. We expect to meet our long-term liquidity requirements with operating cash flow, cash on hand, secured and unsecured indebtedness, and the issuance of equity and debt securities.

We have a credit agreement with a syndicated group of lenders for a term loan facility (the "Term Loan Facility") in an aggregate amount of $100.0 million, which amount is outstanding, with an effective interest rate of 3.08% as of June 30, 2017. We have an expansion option under the Term Loan Facility, which, if exercised in full, would provide for a total Term Loan Facility in an aggregate amount of $200.0 million.

We believe that, as a publicly-traded REIT, we will have access to multiple sources of capital to fund our long-term liquidity requirements, including the incurrence of additional debt and the issuance of debt and additional equity securities. However, we cannot assure you that this will be the case.

At June 30, 2017, we had $13.6 million in cash and cash equivalents and $14.0 million of restricted cash, an increase in cash and cash equivalents of $1.0 million and an increase in restricted cash of $11.2 million from December 31, 2016. Restricted cash primarily consists of like-kind exchange proceeds from the sale of two self storage properties and escrowed funds deposited with financial institutions for real estate taxes, insurance, and other reserves for capital improvements in accordance with our loan agreements. The following discussion relates to changes in cash due to operating, investing, and financing activities, which are presented in our condensed consolidated statements of cash flows included in Item 1 of this report.

Cash Flows From Operating Activities

Cash provided by our operating activities was $55.5 million for the six months ended June 30, 2017 compared to $40.4 million for the six months ended June 30, 2016, an increase of $15.1 million. Our operating cash flow increased primarily due to the 65 self storage properties that were acquired between July 1, 2016 and December 31, 2016 that generated cash flow for the entire six months ended June 30, 2017, and an additional 15 self storage properties acquired during the six months ended June 30, 2017. Because these 80 self storage properties were acquired after June 30, 2016, our operating results for the six months ended June 30, 2016 were not impacted by them. In addition, we received $2.4 million of operating distributions from our unconsolidated real estate venture during the six months ended June 30, 2017. The increase in our operating cash flows from these acquisitions was partially offset by higher cash payments for general and administrative expenses and interest expense.

37

Cash Flows From Investing Activities

Cash used in investing activities was $91.8 million for the six months ended June 30, 2017 compared to $129.8 million for the six months ended June 30, 2016. The primary uses of cash for the six months ended June 30, 2017 were for our acquisition of 15 self storage properties for cash consideration of $86.9 million, capital expenditures of $7.1 million, investments in our unconsolidated real estate venture of $12.6 million and deposits for potential acquisitions of $0.6 million partially offset by $15.3 million of proceeds from the sale of three self storage properties. The primary uses of cash for the six months ended June 30, 2016 were for our acquisition of 42 self storage properties for cash consideration of $123.9 million, capital expenditures of $3.6 million, and deposits for potential acquisitions of $1.9 million.

Capital expenditures totaled $7.1 million and $3.6 million during the six months ended June 30, 2017 and 2016, respectively. We generally fund post-acquisition capital additions from cash provided by operating activities.

We categorize our capital expenditures broadly into three primary categories:

• recurring capital expenditures, which represent the portion of capital expenditures that are deemed to replace the consumed portion of acquired capital assets and extend their useful life;

• revenue enhancing capital expenditures, which represent the portion of capital expenditures that are made to enhance the revenue and value of an asset from its original purchase condition; and

• acquisitions capital expenditures, which represent the portion of capital expenditures capitalized during the current period that were identified and underwritten prior to a property's acquisition.

A summary of the capital expenditures for these categories, along with a reconciliation of the total for these categories to the capital expenditures reported in the accompanying condensed consolidated statements of cash flows for the six months ended June 30, 2017 and 2016, are presented below (dollars in thousands):

	Six Months Ended June 30,
	2017		2016
Recurring capital expenditures	$	1,811	$	1,506
Revenue enhancing capital expenditures	314		930
Acquisitions capital expenditures	4,726		1,675
Total capital expenditures	6,851		4,111
Change in accrued capital spending	234		(497		)
Capital expenditures per statement of cash flows	$	7,085	$	3,614

Cash Flows From Financing Activities

Cash provided by our financing activities was $48.5 million for the six months ended June 30, 2017 compared to cash provided by our financing activities of $93.9 million for the six months ended June 30, 2016. Our sources of financing cash flows for the six months ended June 30, 2017 primarily consisted of $310.5 million of borrowings under our credit facility and $7.0 million of proceeds from the issuance of 300,043 subordinated performance units to an affiliate of Personal Mini. Our primary uses of financing cash flows for the six months ended June 30, 2017 were for principal payments on existing debt of $218.8 million (which included $206.0 million of principal repayments under the Revolver, $10.4 million of fixed rate mortgage principal payoffs and $2.3 million of scheduled fixed rate mortgage principal payments), distributions to noncontrolling interests of $26.9 million, and distributions to common shareholders of $22.1 million. Our sources of financing cash flows for the six months ended June 30, 2016 primarily consisted of $381.5 million of borrowings under our credit facility. Our primary uses of financing cash flows for the six months ended June 30, 2016 were for principal payments on existing debt of $252.6 million, distributions to noncontrolling interests of $21.7 million, and distributions to common shareholders of $9.7 million.

In connection with the 15 properties acquired during the six months ended June 30, 2017, we issued OP equity of $13.9 million (consisting of 473,533 OP units, 96,394 subordinated performance units and the vesting of 24,400 LTIP units previously issued) and paid cash of $86.9 million.

38

On May 25, 2017, our board of trustees declared a cash dividend and distribution, respectively, of $0.26 per common share and OP unit. Such distributions were paid on June 30, 2017 to shareholders and OP unitholders of record as of June 15, 2017. On June 16, 2017, our board of trustees declared cash distributions of $6.9 million, in the aggregate, to subordinated performance unitholders of record as of June 15, 2017. Such distributions were paid on June 30, 2017.

During the six months ended June 30, 2017, after receiving notices of redemption from certain holders of OP units, we elected to issue 1,153,518 common shares to such holders in exchange for 1,153,518 OP units in satisfaction of the operating partnership's redemption obligations.

Cash Distributions from our Operating Partnership

Under the LP Agreement of our operating partnership, to the extent that we, as the general partner of our operating partnership, determine to make distributions to the partners of our operating partnership out of the operating cash flow or capital transaction proceeds generated by a real property portfolio managed by one of our PROs, the holders of the series of subordinated performance units that relate to such portfolio are entitled to share in such distributions. Under the LP Agreement of our operating partnership, operating cash flow with respect to a portfolio of properties managed by one of our PROs is generally an amount determined by us, as general partner, of our operating partnership equal to the excess of property revenues over property related expenses from that portfolio. In general, property revenue from the portfolio includes:

(i) all receipts, including rents and other operating revenues;

(ii) any incentive, financing, break-up and other fees paid to us by third parties;

(iii) amounts released from previously set aside reserves; and

(iv) any other amounts received by us, which we allocate to the particular portfolio of properties.

In general, property-related expenses include all direct expenses related to the operation of the properties in that portfolio, including real property taxes, insurance, property-level general and administrative expenses, employee costs, utilities, property marketing expense, property maintenance and property reserves and other expenses incurred at the property level. In addition, other expenses incurred by our operating partnership may also be allocated by us, as general partner, to the property portfolio and will be included in the property-related expenses of that portfolio. Examples of such other expenses include:

(i) corporate-level general and administrative expenses;

(ii) out-of-pocket costs, expenses and fees of our operating partnership, whether or not capitalized;

(iii) the costs and expenses of organizing and operating our operating partnership;

(iv) amounts paid or due in respect of any loan or other indebtedness of our operating partnership during such period;

(v) extraordinary expenses of our operating partnership not previously or otherwise deducted under item (ii) above;

(vi) any third-party costs and expenses associated with identifying, analyzing, and presenting a proposed property to us and/or our operating partnership; and

(vii) reserves to meet anticipated operating expenditures, debt service or other liabilities, as determined by us.

To the extent that we, as the general partner of our operating partnership, determine to make distributions to the partners of our operating partnership out of the operating cash flow of a real property portfolio managed by one of our PROs, operating cash flow from a property portfolio is required to be allocated to holders of OP units and to the holders of series of subordinated performance units that relate to such property portfolio as follows:

First, an amount is allocated to holders of OP units in order to provide holders of OP units (together with any prior allocations of capital transaction proceeds) with a cumulative preferred allocation on the unreturned capital contributions attributed to the OP units in respect of such property portfolio. The preferred allocation for all of our existing portfolios is 6%. As of June 30, 2017, our operating partnership had an aggregate of $1,080.7 million of such unreturned capital contributions with respect to common shareholders, OP unitholders, and the various property portfolios.

Second, an amount is allocated to the holders of the series of subordinated performance units relating to such property portfolio in order to provide such holders with an allocation (together with prior distributions of capital transaction proceeds) on their unreturned capital contributions. Although the subordinated allocation for the

39

subordinated performance units is non-cumulative from period to period, if the operating cash flow from a property portfolio related to a series of subordinated performance units is sufficient, in the judgment of the general partner (with the approval of a majority of our independent trustees), to fund distributions to the holders of such series of subordinated performance units, but we, as the general partner of our operating partnership, decline to make distributions to such holders, the amount available but not paid as distributions will be added to the capital contributions corresponding to such series of subordinated performance units. The subordinated allocation for the outstanding subordinated performance units is 6%. As of June 30, 2017, an aggregate of $188.3 million of unreturned capital contributions has been allocated to the various series of subordinated performance units.

Thereafter, any additional operating cash flow is allocated to holders of OP units and the applicable series of subordinated performance units equally.

Following the allocation described above, we as the general partner of our operating partnership, will generally cause our operating partnership to distribute the amounts allocated to the relevant series of subordinated performance units to the holders of such series of subordinated performance units. We, as the general partner may cause our operating partnership to distribute the amounts allocated to holders of the OP units or may cause our operating partnership to retain such amounts to be used by our operating partnership for any purpose. Any operating cash flow that is attributable to amounts retained by our operating partnership pursuant to the preceding sentence will generally be available to be allocated as an additional capital contribution to the various property portfolios.

The foregoing description of the allocation of operating cash flow between the OP unit holders and subordinated performance unit holders is used for purposes of determining distributions to holders of subordinated performance units but does not necessarily represent the operating cash flow that will be distributed to holders of OP units (or paid as dividends to holders of our common shares). Any distribution of operating cash flow allocated to the holders of OP units will be made at our discretion (and paid as dividends to holders of our common shares at the discretion of our board of trustees).

Under the LP Agreement of our operating partnership, capital transactions are transactions that are outside the ordinary course of our operating partnership's business, involve the sale, exchange, other disposition, or refinancing of any property, and are designated as capital transactions by us, as the general partner. To the extent the general partner determines to distribute capital transaction proceeds, the proceeds from capital transactions involving a particular property portfolio are required to be allocated to holders of OP units and to the series of subordinated performance units that relate to such property portfolio as follows:

First, an amount determined by us, as the general partner, of such capital transaction proceeds is allocated to holders of OP units in order to provide holders of OP units (together with any prior allocations of operating cash flow) with a cumulative preferred allocation on the unreturned capital contributions attributed to the holders of OP units in respect of such property portfolio that relate to such capital transaction plus an additional amount equal to such unreturned capital contributions.

Second, an amount determined by us, as the general partner, is allocated to the holders of the series of subordinated performance units relating to such property portfolio in order to provide such holders with a non-cumulative subordinated allocation on the unreturned capital contributions made by such holders in respect of such property portfolio that relates to such capital transaction plus an additional amount equal to such unreturned capital contributions.

The preferred allocation and subordinated allocation with respect to capital transaction proceeds for each portfolio is equal to the preferred allocation and subordinated allocation for distributions of operating cash flow with respect to that portfolio.

Thereafter, any additional capital transaction proceeds are equally allocated to holders of OP units and the applicable series of subordinated performance units.

Following the allocation described above, we, as the general partner of our operating partnership, will generally cause our operating partnership to distribute the amounts allocated to the relevant series of subordinated performance units to the holders of such series of subordinated performance units. We, as general partner of our operating partnership, may cause our operating partnership to distribute the amounts allocated to holders of the OP units or may cause our operating partnership to retain such amounts to be used by our operating partnership for any purpose, including additional acquisitions through the use of 1031 exchanges. Any capital transaction proceeds that are attributable to amounts retained by our operating partnership pursuant to the preceding sentence will generally be available to be allocated as an additional capital contribution to the various property portfolios.

40

The foregoing allocation of capital transaction proceeds between the OP unit holders and subordinated performance unit holders is used for purposes of determining distributions to holders of subordinated performance units but does not necessarily represent the capital transaction proceeds that will be distributed to holders of OP units (or paid as dividends to holders of our common shares). Any distribution of capital transaction proceeds allocated to the holders of OP units will be made at our discretion (and paid as dividends to holders of our common shares at the discretion of our board of trustees).

Allocation of Capital Contributions

We, as the general partner of our operating partnership, in our discretion, have the right to increase or decrease, as appropriate, the amount of capital contributions allocated to our operating partnership in general and to each series of subordinated performance units to reflect capital expenditures made by our operating partnership in respect of each portfolio, the sale or refinancing of all or a portion of the properties comprising the portfolio, the distribution of capital transaction proceeds by our operating partnership, the retention by our operating partnership of cash for working capital purposes and other events impacting the amount of capital contributions allocated to the holders. In addition, to avoid conflicts of interests, any decision by us to increase or decrease allocations of capital contributions must also be approved by a majority of our independent trustees.

Off-Balance Sheet Arrangements

Except as disclosed in the notes to our financial statements, as of June 30, 2017, we did not 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 financial statements, as of June 30, 2017, 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.

Seasonality

The self storage business is subject to minor seasonal fluctuations. A greater portion of revenues and profits are realized from May through September. Historically, our highest level of occupancy has typically been in July, while our lowest level of occupancy has typically been in February. 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

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. The primary market risk to which we believe we are exposed is 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. We use interest rate swaps to moderate our exposure to interest rate risk by effectively converting the interest on variable rate debt to a fixed rate. We make limited use of other derivative financial instruments and we do not use them for trading or other speculative purposes.

As of June 30, 2017, we had $181.0 million of debt subject to variable interest rates (excluding variable-rate debt subject to interest rate swaps). If one-month LIBOR were to increase or decrease by 100 basis points, the increase or decrease in interest expense on the variable-rate debt (excluding variable-rate debt subject to interest rate swaps) would increase or decrease future earnings and cash flows by approximately $1.8 million 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.

ITEM 4. Controls and Procedures

Disclosure Controls and Procedures

The Company's management, with the participation of the Company's chief executive officer and chief financial officer, has evaluated the effectiveness of the Company's disclosure controls and procedures (as defined in Rules 13a-15

41

(e) and 15d-15(e) under the Exchange Act) as of the end of the period covered by this report. Based on that evaluation, the chief executive officer and chief financial officer concluded that the Company's disclosure controls and procedures, as of the end of the period covered by this report, are effective.

Changes in Internal Control Over Financial Reporting

There have been no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the three months ended June 30, 2017 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Notwithstanding the foregoing, a control system, no matter how well designed and operated, can provide only reasonable, not absolute assurance that it will detect or uncover failures within the Company to disclose material information otherwise required to be set forth in our periodic reports.

PART II. OTHER INFORMATION

ITEM 1. Legal Proceedings

We are not currently subject to any legal proceedings that we consider to be material.

ITEM 1A. Risk Factors

For a discussion of our potential risks and uncertainties, see the Company's Annual Report on Form 10-K for the year ended December 31, 2016 filed with the SEC on February 28, 2017 under the heading Item 1A. "Risk Factors" beginning on page 14, which is accessible on the SEC's website at www.sec.gov. During the six months ended June 30, 2017, there have been no material changes to such risk factors disclosed in our Annual Report on Form 10-K filed with the SEC on February 28, 2017.

ITEM 2. Unregistered Sales of Equity Securities and Use of Proceeds

Unregistered Sales of Equity Securities

During the three months ended June 30, 2017, the Company, in its capacity as general partner of its operating partnership, caused the operating partnership to issue 76,444 common shares to satisfy redemption requests from certain limited partners.

On May 1, 2017, the operating partnership issued 155,152 OP units to an unrelated third party as partial consideration for the acquisition of a self storage property.

On May 8, 2017, the operating partnership issued 10,766 OP units to Van Mourick Diversified, LP, an affiliate of Optivest, one of the Company's existing PROs and an affiliate of Mark Van Mourick, a member of the Company's board of trustees, and 53,462 OP units to unrelated third parties as partial consideration for the acquisition of a self storage property.

On May 31, 2017, the operating partnership issued 79,459 OP units and 4,145 subordinated performance units to an unrelated third party as partial consideration for the acquisition of a self storage property.

On June 13, 2017, the operating partnership issued 44,917 subordinated performance units to SA-SCMI LLC, an affiliate of Securcare and Move It, two of the Company's existing PROs. As of June 13, 2017, SA-SCMI LLC was also an affiliate of Arlen D. Nordhagen, the Company's chairman and chief executive officer.

Following a specified lock up period after the respective dates of issuance set forth above, the OP units issued by the operating partnership may be redeemed from time to time by holders for a cash amount per OP unit equal to the market value of an equivalent number of common shares of the Company. The Company has the right, but not the obligation, to assume and satisfy the redemption obligation of its operating partnership described above by issuing one common share in exchange for each OP unit tendered for redemption. The Company has elected to report early the private placement of its common shares that may occur if the Company elects to assume the redemption obligation of its operating partnership as described above in the event that OP units are in the future tendered for redemption.

As of August 2, 2017, other than those OP units held by the Company, after reflecting the transactions described herein, 29,026,731 OP units of its operating partnership were outstanding (including 771,396 outstanding LTIP units in the operating partnership and 1,834,786 outstanding OP units ("DownREIT OP units") in certain consolidated subsidiaries of the operating partnership, which are convertible into, or exchangeable for, OP units on a one-for-basis,

42

subject to certain conditions). These issuances were exempt from registration under Section 4(a)(2) of the Securities Act of 1933, as amended.

Use of Proceeds

Not applicable.

Issuer Purchases of Equity Securities

Not applicable.

ITEM 3. Defaults Upon Senior Securities

Not applicable.

ITEM 4. Mine Safety Disclosures

Not applicable.

ITEM 5. Other Information

Not applicable.

ITEM 6. Exhibits
The following exhibits are filed with this report:
Exhibit Number	Exhibit Description
3.1	Articles of Amendment and Restatement of National Storage Affiliates Trust (Exhibit 3.1 to the Quarterly Report on Form 10-Q, filed with the SEC on June 5, 2015, is incorporated herein by this reference)
3.2	Amended and Restated Bylaws of National Storage Affiliates Trust (Exhibit 3.2 to the Quarterly Report on Form 10-Q, filed with the SEC on June 5, 2015, is incorporated herein by this reference)
4.1	Specimen Common Share Certificate of National Storage Affiliates Trust (Exhibit 4.1 to the Registration Statement on Form S-11/A filed with the SEC on April 20, 2015, is incorporated by reference)
31.1*	Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2*	Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1*	Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101*	XBRL (Extensible Business Reporting Language). The following materials from NSA's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2017, tagged in XBRL: ((i) condensed consolidated balance sheets; (ii) condensed consolidated statements of operations; (iii) condensed consolidated statements of comprehensive income (loss); (iv) condensed consolidated statement of changes in equity; (v) condensed consolidated statements of cash flows; and (vi) notes to condensed consolidated financial statements.
*	Filed herewith.

43

SIGNATURES

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

	National Storage Affiliates Trust
By:	/s/ ARLEN D. NORDHAGEN
	Arlen D. Nordhagen
	chairman of the board of trustees
	and chief executive officer
	(principal executive officer)
By:	/s/ TAMARA D. FISCHER
	Tamara D. Fischer
	chief financial officer
	(principal financial officer)

Date: August 3, 2017

44

EX-31.1

Exhibit 31.1

Chief Executive Officer Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Arlen D. Nordhagen, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of National Storage Affiliates Trust;

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(s) 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 controls 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(s) 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 trustees (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: August 3, 2017

By:	/s/ Arlen D. Nordhagen
	Arlen D. Nordhagen
	Chairman of the Board of Trustees and Chief Executive Officer

EX-31.2

Exhibit 31.2

Chief Financial Officer Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Tamara D. Fischer, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of National Storage Affiliates Trust;

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(s) 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 controls 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(s) 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 trustees (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: August 3, 2017

By:	/s/ Tamara D. Fischer
	Tamara D. Fischer
	Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification, 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

In connection with the Quarterly Report of National Storage Affiliates Trust (the “Company”) on Form 10-Q for the period ended June 30, 2017 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Arlen D. Nordhagen, Chairman of the Board of Trustees and Chief Executive Officer of the Company, and I, Tamara D. Fischer, Executive Vice President and Chief Financial Officer of the Company, hereby certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1) the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 3, 2017

By:	/s/ Arlen D. Nordhagen
	Arlen D. Nordhagen
	Chairman of the Board of Trustees and Chief Executive Officer

By:	/s/ Tamara D. Fischer
	Tamara D. Fischer
	Executive Vice President and Chief Financial Officer

Pursuant to the Securities and Exchange Commission Release 33-8238, dated June 5, 2003, this certification is being furnished and shall not be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or incorporated by reference in any registration statement of the Company filed under the Securities Act of 1933, as amended.

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

DOCUMENT AND ENTITY INFORMATION - shares	6 Months Ended
	Jun. 30, 2017	Aug. 02, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	National Storage Affiliates Trust
Entity Central Index Key	0001618563
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		44,296,944

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Real estate
Self storage properties	$ 1,954,056	$ 1,844,336
Less accumulated depreciation	(138,726)	(110,803)
Self storage properties, net	1,815,330	1,733,533
Cash and cash equivalents	13,591	12,570
Restricted cash	13,954	2,767
Debt issuance costs, net	2,668	3,069
Investment in unconsolidated real estate venture	89,916	81,486
Other assets, net	42,083	44,730
Assets held for sale	0	13,937
Total assets	1,977,542	1,892,092
Liabilities
Debt financing	969,140	878,954
Accounts payable and accrued liabilities	21,050	21,616
Deferred revenue	12,685	12,454
Total liabilities	1,002,875	913,024
Commitments and contingencies (Note 11)
Equity
Common shares of beneficial interest, par value $0.01 per share. 250,000,000 shares authorized, 44,279,824 and 43,110,362 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	443	431
Additional paid-in capital	594,192	576,365
Distributions in excess of earnings	(27,870)	(8,719)
Accumulated other comprehensive income	8,748	9,025
Total shareholders' equity	575,513	577,102
Noncontrolling interests	399,154	401,966
Total equity	974,667	979,068
Total liabilities and equity	$ 1,977,542	$ 1,892,092

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares of beneficial interest, authorized (in shares)	250,000,000	250,000,000
Common shares of beneficial interest, issued (in shares)	44,279,824	43,110,362
Common shares of beneficial interest, outstanding (in shares)	44,279,824	43,110,362

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
REVENUE
Rental revenue	$ 60,154	$ 45,784	$ 117,998	$ 84,285
Other property-related revenue	2,045	1,500	3,926	2,648
Management fees and other revenue	2,142	0	3,980	0
Total revenue	64,341	47,284	125,904	86,933
OPERATING EXPENSES
Property operating expenses	19,803	15,457	39,552	28,734
General and administrative expenses	7,405	4,837	14,586	9,172
Depreciation and amortization	17,800	13,088	36,483	23,980
Total operating expenses	45,008	33,382	90,621	61,886
Income from operations	19,333	13,902	35,283	25,047
OTHER (EXPENSE) INCOME
Interest expense	(8,160)	(5,844)	(15,631)	(10,785)
Loss on early extinguishment of debt	0	(136)	0	(136)
Equity in losses of unconsolidated real estate venture	(765)	0	(1,550)	0
Acquisition costs	(167)	(1,708)	(311)	(2,996)
Non-operating expense	(14)	(57)	(66)	(62)
Gain on sale of self storage properties	5,637	0	5,637	0
Other expense	(3,469)	(7,745)	(11,921)	(13,979)
Income before income taxes	15,864	6,157	23,362	11,068
Income tax expense	(288)	(112)	(605)	(221)
Net income	15,576	6,045	22,757	10,847
Net (income) loss attributable to noncontrolling interests	(13,209)	1,325	(19,835)	(1,267)
Net income attributable to National Storage Affiliates Trust	$ 2,367	$ 7,370	$ 2,922	$ 9,580
Earnings (loss) per share - basic (in dollars per share)	$ 0.05	$ 0.32	$ 0.07	$ 0.42
Earnings (loss) per share - diluted (in dollars per share)	$ 0.05	$ 0.08	$ 0.07	$ 0.15
Weighted average shares outstanding - basic (in shares)	44,223	23,078	43,814	23,041
Weighted average shares outstanding - diluted (in shares)	44,223	73,531	43,814	70,763
Dividends declared per common share (in dollars per share)	$ 0.26	$ 0.22	$ 0.50	$ 0.42

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 15,576	$ 6,045	$ 22,757	$ 10,847
Other comprehensive income (loss)
Unrealized loss on derivative contracts	(3,852)	(6,542)	(2,239)	(8,437)
Reclassification of other comprehensive loss to interest expense	760	506	1,530	909
Other comprehensive loss	(3,092)	(6,036)	(709)	(7,528)
Comprehensive income	12,484	9	22,048	3,319
Comprehensive (income) loss attributable to noncontrolling interests	(11,992)	7,361	(19,578)	5,568
Comprehensive income attributable to National Storage Affiliates Trust	$ 492	$ 7,370	$ 2,470	$ 8,887

XML

CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Total	OP Units and Subordinated Performance Units [Member]	LTIP units [Member]	Subordinated performance units [Member]	Common Shares [Member]	Additional Paid-in Capital [Member]	Distributions In Excess Of Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Noncontrolling Interests [Member]	Noncontrolling Interests [Member] OP Units and Subordinated Performance Units [Member]	Noncontrolling Interests [Member] LTIP units [Member]	Noncontrolling Interests [Member] Subordinated performance units [Member]
Balances (in shares) at Dec. 31, 2016	43,110,362				43,110,362
Balances at Dec. 31, 2016	$ 979,068				$ 431	$ 576,365	$ (8,719)	$ 9,025	$ 401,966
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of equity units		$ 13,058		$ 7,000						$ 13,058		$ 7,000
LTIP units			$ 587								$ 587
Redemptions of OP units (in shares)					1,153,518
Redemptions of OP units	0				$ 12	15,155		239	(15,406)
Effect of changes in ownership for consolidated entities	0					2,572		(64)	(2,508)
Equity-based compensation expense	1,923					120			1,803
Issuance of LTIP units for acquisition expenses	4								4
Issuance of restricted common shares (in shares)					16,525
Issuance of restricted common shares, value	0
Vesting and forfeitures of restricted common shares, net (in shares)					(581)
Vesting and forfeitures of restricted common shares, net	(20)					(20)
Reduction in receivables from partners of OP	438								438
Other comprehensive loss	(709)							(452)	(257)
Common share dividends	(22,073)						(22,073)
Distributions to noncontrolling interests	(27,366)								(27,366)
Net income	$ 22,757						2,922		19,835
Balances (in shares) at Jun. 30, 2017	44,279,824				44,279,824
Balances at Jun. 30, 2017	$ 974,667				$ 443	$ 594,192	$ (27,870)	$ 8,748	$ 399,154

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 22,757	$ 10,847
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	36,483	23,980
Amortization of debt issuance costs	1,059	1,040
Amortization of debt discount and premium, net	(791)	(1,026)
Loss on debt extinguishment	0	136
Gain on sale of self storage properties	(5,637)	0
LTIP units issued for acquisition expenses	0	56
Equity-based compensation expense	1,923	1,227
Equity in losses of unconsolidated real estate venture	1,550	0
Distributions from unconsolidated real estate venture	2,417	0
Change in assets and liabilities, net of effects of self storage property acquisitions:
Other assets	(3,312)	(779)
Accounts payable and accrued liabilities	(649)	4,594
Deferred revenue	(256)	304
Net Cash Provided by Operating Activities	55,544	40,379
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition of self storage properties	(86,945)	(123,932)
Capital expenditures	(7,085)	(3,614)
Investments in and advances to unconsolidated real estate venture	(12,647)	0
Distributions from unconsolidated real estate venture	250	0
Deposits and advances for self storage property and other acquisitions	(565)	(1,933)
Expenditures for corporate furniture, equipment and other	(157)	(336)
Proceeds from sale of self storage properties	15,342	0
Net Cash Used In Investing Activities	(91,807)	(129,815)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of subordinated performance units	7,000	0
Borrowings under debt financings	310,500	381,500
Receipts for OP unit subscriptions	567	789
Collection of receivables from issuance of OP equity	0	570
Principal payments under debt financings	(218,762)	(252,586)
Payment of dividends to common shareholders	(22,073)	(9,711)
Distributions to noncontrolling interests	(26,866)	(21,725)
Debt issuance costs	(1,346)	(4,612)
Equity offering costs	(549)	(311)
Net Cash Provided By Financing Activities	48,471	93,914
Increase in Cash, Cash Equivalents and Restricted Cash	12,208	4,478
CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Beginning of period	15,337	9,377
End of period	27,545	13,855
Supplemental Cash Flow Information
Cash paid for interest	$ 15,061	$ 10,354

XML

ORGANIZATION AND NATURE OF OPERATIONS

6 Months Ended

Jun. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

ORGANIZATION AND NATURE OF OPERATIONS

ORGANIZATION AND NATURE OF OPERATIONS

National Storage Affiliates Trust was organized in the state of Maryland on May 16, 2013 and is a fully integrated, self-administered and self-managed real estate investment trust focused on the self storage sector. As used herein, "NSA," the "Company," "we," "our," and "us" refers to National Storage Affiliates Trust and its consolidated subsidiaries, except where the context indicates otherwise. The Company has elected and believes it has qualified as a real estate investment trust ("REIT") for U.S. federal income tax purposes commencing with its taxable year ending December 31, 2015.

Through its controlling interest as the sole general partner of NSA OP, LP (its "operating partnership"), a Delaware limited partnership formed on February 13, 2013, the Company is focused on the ownership, operation, and acquisition of self storage properties located within the top 100 metropolitan statistical areas in the United States. Pursuant to the Agreement of Limited Partnership (as amended, the "LP Agreement") of its operating partnership, the Company's operating partnership is authorized to issue Class A Units ("OP units"), different series of Class B Units ("subordinated performance units"), and Long-Term Incentive Plan Units ("LTIP units"). The Company also owns certain of its self storage properties through other consolidated limited partnership subsidiaries of its operating partnership, which the Company refers to as "DownREIT partnerships." The DownREIT partnerships issue equity ownership interests that are intended to be economically equivalent to the Company's OP units ("DownREIT OP units") and subordinated performance units ("DownREIT subordinated performance units").

The Company owned 394 self storage properties in 21 states with approximately 23.9 million rentable square feet in approximately 190,000 storage units as of June 30, 2017. These properties are managed with local operational focus and expertise by the Company's participating regional operators ("PROs"). These PROs are SecurCare Self Storage, Inc. and its controlled affiliates ("SecurCare"), Kevin Howard Real Estate Inc., d/b/a Northwest Self Storage and its controlled affiliates ("Northwest"), Optivest Properties LLC and its controlled affiliates ("Optivest"), Guardian Storage Centers LLC and its controlled affiliates ("Guardian"), Move It Self Storage and its controlled affiliates ("Move It"), Arizona Mini Storage Management Company d/b/a Storage Solutions and its controlled affiliates ("Storage Solutions"), Hide-Away Storage Services, Inc. and its controlled affiliates ("Hide-Away") and an affiliate of Shader Brothers Corporation d/b/a Personal Mini Storage ("Personal Mini") of Orlando, Florida.

XML

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

6 Months Ended

Jun. 30, 2017

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The accompanying condensed consolidated financial statements are presented on the accrual basis of accounting in accordance with U.S. generally accepted accounting principles ("GAAP") and have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC") regarding interim financial reporting. Accordingly, certain information and footnote disclosures required by GAAP for complete financial statements have been condensed or omitted in accordance with such rules and regulations. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation of the condensed consolidated financial statements have been included. The Company's results of operations for the quarterly period ended June 30, 2017 are not necessarily indicative of the results to be expected for the full year or any other future period.

Principles of Consolidation

The Company's financial statements include the accounts of its operating partnership and its controlled subsidiaries. All significant intercompany balances and transactions have been eliminated in the consolidation of entities.

When the Company obtains an economic interest in an entity, the Company evaluates the entity to determine if the entity is deemed a variable interest entity ("VIE"), and if the Company is deemed to be the primary beneficiary, in accordance with authoritative guidance issued on the consolidation of VIEs. When an entity is not deemed to be a VIE, the Company considers the provisions of additional guidance to determine whether the general partner controls a limited partnership or similar entity when the limited partners have certain rights. The Company consolidates all entities that are VIEs and of which the Company is deemed to be the primary beneficiary. The Company has determined that its operating partnership is a VIE. The sole significant asset of National Storage Affiliates Trust is its investment in its operating partnership, and consequently, substantially all of the Company’s assets and liabilities represent those assets and liabilities of its operating partnership.

As of June 30, 2017 and December 31, 2016, the Company's operating partnership was the primary beneficiary of, and therefore consolidated, 21 DownREIT partnerships that are considered VIEs, which owned 34 self storage properties. The net book value of the real estate owned by these VIEs was $252.9 million and $256.8 million as of June 30, 2017 and December 31, 2016, respectively. For the DownREIT partnerships which are subject to fixed rate mortgages payable, the carrying value of such fixed rate mortgages payable held by these VIEs was $40.5 million and $41.4 million as of June 30, 2017 and December 31, 2016, respectively. The creditors of the consolidated VIEs do not have recourse to the Company's general credit.

Reclassifications

Certain amounts in the consolidated financial statements and related notes have been reclassified to conform to the current year presentation. Such reclassifications do not impact the Company's previously reported financial position or net income (loss).

Revenue Recognition

Management has determined that all of the Company's leases are operating leases. Substantially all leases may be terminated on a month-to-month basis and rental income is recognized ratably over the lease term using the straight-line method. Rents received in advance are deferred and recognized on a straight-line basis over the related lease term associated with the prepayment. Promotional discounts and other incentives are recognized as a reduction to rental income over the applicable lease term. Other property-related revenue consists of ancillary revenues such as tenant insurance-related access fees and commissions and sales of storage supplies which are recognized in the period earned.

The Company recognizes gains from disposition of facilities only upon closing in accordance with the guidance on sales of real estate. Payments received from purchasers prior to closing are recorded as deposits. Profit on real estate sold is recognized using the full accrual method upon closing when the collectability of the sales price is reasonably assured and the Company is not obligated to perform significant activities after the sale. Profit may be deferred in whole or part until the sale meets the requirements of profit recognition on sales under this guidance.

The Company earns management and other fees for managing and operating its unconsolidated real estate venture. These fees include property management fees, call center fees, platform fees, acquisition fees, development fees and a portion of tenant warranty protection proceeds. The Company recognizes these fees when they are earned, fixed and determinable. The fees are reported in management fees and other revenue in the Company's condensed consolidated statements of operations.

Investments in Unconsolidated Real Estate Venture

The Company’s investment in its unconsolidated real estate venture is recorded under the equity method of accounting in the accompanying consolidated financial statements. Under the equity method, the Company’s investment in unconsolidated real estate venture is stated at cost and adjusted for the Company’s share of net earnings or losses and reduced by distributions. Equity in earnings (losses) is recognized based on the Company’s ownership interest in the earnings (losses) of the unconsolidated real estate venture. The Company follows the "look through" approach for classification of distributions from its unconsolidated real estate venture in its consolidated statements of cash flows. Under this approach, distributions are reported under operating cash flow unless the facts and circumstances of a specific distribution clearly indicate that it is a return of capital (e.g., proceeds from the unconsolidated real estate venture’s sale of assets), in which case it is reported as an investing activity.

Noncontrolling Interests

All of the limited partner equity interests in the operating partnership not held by the Company are reflected as noncontrolling interests. Noncontrolling interests also include ownership interests in DownREIT partnerships held by entities other than the operating partnership or its subsidiaries. In the condensed consolidated statements of operations, the Company allocates net income (loss) attributable to noncontrolling interests to arrive at net income (loss) attributable to National Storage Affiliates Trust.

For transactions that result in changes to the Company's ownership interest in its operating partnership, the carrying amount of noncontrolling interests is adjusted to reflect such changes. The difference between the fair value of the consideration received or paid and the amount by which the noncontrolling interest is adjusted is reflected as an adjustment to additional paid-in capital on the condensed consolidated balance sheets.

Allocation of Net Income (Loss)

The distribution rights and priorities set forth in the operating partnership's LP Agreement differ from what is reflected by the underlying percentage ownership interests of the unitholders. Accordingly, the Company allocates GAAP income (loss) utilizing the hypothetical liquidation at book value ("HLBV") method, in which the Company allocates income or loss based on the change in each unitholders’ claim on the net assets of its operating partnership at period end after adjusting for any distributions or contributions made during such period. The HLBV method is commonly applied to equity investments where cash distribution percentages vary at different points in time and are not directly linked to an equity holder’s ownership percentage.

The HLBV method is a balance sheet-focused approach to income (loss) allocation. A calculation is prepared at each balance sheet date to determine the amount that unitholders would receive if the operating partnership were to liquidate all of its assets (at GAAP net book value) and distribute the resulting proceeds to its creditors and unitholders based on the contractually defined liquidation priorities. The difference between the calculated liquidation distribution amounts at the beginning and the end of the reporting period, after adjusting for capital contributions and distributions, is used to derive each unitholder's share of the income (loss) for the period. Due to the stated liquidation priorities and because the HLBV method incorporates non-cash items such as depreciation expense, in any given period, income or loss may be allocated disproportionately to unitholders as compared to their respective ownership percentage in the operating partnership, and net income (loss) attributable to National Storage Affiliates Trust could be more or less net income than actual cash distributions received and more or less income or loss than what may be received in the event of an actual liquidation. Additionally, the HLBV method could result in net income (or net loss) attributable to National Storage Affiliates Trust during a period when the Company reports consolidated net loss (or net income), or net income (or net loss) attributable to National Storage Affiliates Trust in excess of the Company's consolidated net income (or net loss). The computations of basic and diluted earnings (loss) per share may be materially affected by these disproportionate income (loss) allocations, resulting in volatile fluctuations of basic and diluted earnings (loss) per share.

Other Comprehensive Income (Loss)

The Company has cash flow hedge derivative instruments that are measured at fair value with unrealized gains or losses recognized in other comprehensive income (loss) with a corresponding adjustment to accumulated other comprehensive income within equity, as discussed further in Note 12. Under the HLBV method of allocating income (loss) discussed above, a calculation is prepared at each balance sheet date by applying the HLBV method including, and excluding, the assets and liabilities resulting from the Company's cash flow hedge derivative instruments to determine comprehensive income (loss) attributable to National Storage Affiliates Trust. As a result of the distribution rights and priorities set forth in the operating partnership's LP Agreement, in any given period, other comprehensive income (loss) may be allocated disproportionately to unitholders as compared to their respective ownership percentage in the operating partnership and as compared to their respective allocation of net income (loss).

Restricted Cash

The Company's restricted cash consists of escrowed funds deposited with financial institutions for real estate taxes, insurance and other reserves for capital improvements in accordance with the Company's loan agreements and like-kind exchange proceeds.

Assets held for sale

The Company classifies properties as held for sale when certain criteria are met. At such time, the properties, including significant assets and liabilities that are expected to be transferred as part of a sale transaction, are presented separately on the condensed consolidated balance sheet at the lower of carrying value or estimated fair value less costs to sell and depreciation is no longer recognized. As of December 31, 2016 the Company had two self storage properties classified as held for sale. The results of operations for the self storage properties classified as held for sale are reflected within income from operations in the Company's condensed consolidated statements of operations.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014-09 will replace most existing revenue recognition guidance in GAAP when it becomes effective. ASU 2014-09 is effective for the Company on January 1, 2018, with early application permitted for the Company on January 1, 2017. ASU 2014-09 permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its condensed consolidated financial statements and related disclosures. Although the Company has not yet selected a transition method, as ASU 2014-09 does not impact lessor accounting, the Company does not believe the adoption of ASU 2014-09 will significantly impact its accounting for rental revenue. The Company expects that certain property-related ancillary revenues and management and other fees will be in the scope of the new guidance. Based on the Company’s ongoing evaluation, the Company does not currently anticipate material changes to its recognition of revenue as a result of adopting ASU 2014-09.

In February 2016, the FASB issued ASU 2016-02, Leases, which amends the existing guidance for accounting for leases, including requiring lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases and lessees to recognize most leases on-balance sheet as lease liabilities with corresponding right-of-use assets. ASU 2016-02 is effective for the Company on January 1, 2019, with early application permitted. ASU 2016-02 requires a modified retrospective approach, with entities applying the new guidance at the beginning of the earliest period presented in the financial statements in which they first apply the new standard, with certain elective transition relief. The Company is evaluating the effect that ASU 2016-02 will have on its operating leases, condensed consolidated financial statements and related disclosures.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows, which clarifies the classification of certain cash receipts and cash payments in the statement of cash flows, including debt prepayment or extinguishment costs, settlement of contingent consideration arising from a business combination, insurance settlement proceeds, and distributions from certain equity method investees. The Company adopted ASU 2016-15 effective January 1, 2017, which did not result in any changes to the presentation of amounts shown on the Company's condensed consolidated statements of cash flows for the six months ended June 30, 2017 and 2016.

In November 2016, the FASB issued an ASU 2016-18, Statement of Cash Flows - Restricted Cash, that requires the inclusion of restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted ASU 2016-18 effective January 1, 2017, which resulted in the inclusion of the Company's restricted cash balances along with cash and cash equivalents in the Company's condensed consolidated statement of cash flows and separate line items showing changes in restricted cash balances were eliminated from the Company's condensed consolidated statements of cash flows. ASU 2016-18 was applied retrospectively to all periods presented.

In January 2017, the FASB issued ASU 2017-01, Clarifying the Definition of a Business, which narrows the definition of a business and provides an amended framework for determining whether a transaction involves an asset or a business. The Company adopted ASU 2017-01 effective January 1, 2017. As further discussed in Note 6, as a result of the adoption of ASU 2017-01, the Company's self storage property acquisitions during the six months ended June 30, 2017 were accounted for as asset acquisitions, and accordingly, the acquisition costs related to the self storage property acquisitions were capitalized as part of the basis of the acquired properties.

XML

NONCONTROLLING INTERESTS

6 Months Ended

Jun. 30, 2017

Noncontrolling Interest [Abstract]

NONCONTROLLING INTERESTS

NONCONTROLLING INTERESTS

Noncontrolling Interests

All of the limited partner equity interests in the Company's operating partnership not held by the Company are reflected as noncontrolling interests. Noncontrolling interests also include ownership interests in DownREIT partnerships held by entities other than the Company's operating partnership. NSA is the general partner of its operating partnership and is authorized to cause its operating partnership to issue additional partner interests, including OP units and subordinated performance units, at such prices and on such other terms as it determines in its sole discretion.

As of June 30, 2017 and December 31, 2016, units reflecting noncontrolling interests consisted of the following:

	June 30, 2017	December 31, 2016
OP units	26,274,340	26,125,444
Subordinated performance units	11,418,815	11,022,378
LTIP units	934,323	1,543,905
DownREIT units
DownREIT OP units	1,834,786	1,834,786
DownREIT subordinated performance units	4,386,999	4,386,999
Total	44,849,263	44,913,512

OP Units and DownREIT OP units

OP units in the Company's operating partnership are redeemable for cash or, at the Company's option, exchangeable for the Company's common shares of beneficial interest, $0.01 par value per share ("common shares") on a one-for-one basis, and DownREIT OP units are redeemable for cash or, at the Company's option, exchangeable for OP units in its operating partnership on a one-for-one basis, subject to certain adjustments in each case. The holders of OP units are generally not entitled to elect redemption until one year after the later of the closing of the Company's initial public offering or the issuance of the OP units. The holders of DownREIT OP units are generally not entitled to elect redemption until five years after the date of the contributor's initial contribution. Accordingly, these limited partner interests are included in noncontrolling interests within equity in the accompanying condensed consolidated balance sheets as of June 30, 2017 and December 31, 2016.

The increase in OP Units outstanding from December 31, 2016 to June 30, 2017 was due to the conversion of 828,881 LTIP units into OP units and the issuance of 473,533 OP units in connection with the acquisition of self storage properties, partially offset by the redemption of 1,153,518 OP units for common shares.

Subordinated Performance Units and DownREIT Subordinated Performance Units

Subordinated performance units may also, under certain circumstances, be convertible into OP units which are exchangeable for common shares as described above, and DownREIT subordinated performance units may, under certain circumstances, be exchangeable for subordinated performance units on a one-for-one basis. Subordinated performance units are only convertible into OP units after a two year lock-out period and then generally (i) at the holder’s election only upon the achievement of certain performance thresholds relating to the properties to which such subordinated performance units relate or (ii) at the Company's election upon a retirement event of a PRO that holds such subordinated performance units or upon certain qualifying terminations. The holders of DownREIT subordinated performance units are generally not entitled to elect redemption until at least five years after the date of the contributor's initial contribution.

The increase in subordinated performance units outstanding from December 31, 2016 to June 30, 2017 was due to the issuance of 300,043 subordinated performance units to an affiliate of Personal Mini (the Company's chairman and chief executive officer, Arlen D. Nordhagen, has a noncontrolling minority ownership interest in this affiliate of Personal Mini) and the issuance of 96,394 subordinated performance units in connection with the acquisition of self storage properties.

LTIP Units

LTIP units are a special class of partnership interest in the Company's operating partnership that allow the holder to participate in the ordinary and liquidating distributions received by holders of the OP units (subject to the achievement of specified levels of profitability by the Company's operating partnership or the achievement of certain events). LTIP units may also, under certain circumstances, be convertible into OP units on a one-for-one basis, which are then exchangeable for common shares as described above.

LTIP units were first granted under the 2013 Long-Term Incentive Plan (the "2013 Plan"). Some of the granted LTIP units vested immediately or upon completion of the Company's initial public offering. Others vest upon the contribution of self storage properties or along a schedule at certain times through January 1, 2020. LTIP units do not have full parity with OP units with respect to liquidating distributions and may not receive ordinary distributions until such parity is reached pursuant to the terms of the LP Agreement. If such parity is reached under the LP Agreement, upon vesting, vested LTIP units may be converted into an equal number of OP units, and thereafter have all the rights of OP units, including redemption rights.

The decrease in LTIP units outstanding from December 31, 2016 to June 30, 2017 was due to the conversion of 828,881 LTIP units into 828,881 OP units, partially offset by the issuance of 219,299 compensatory LTIP units to employees, consultants and trustees.

XML

SELF STORAGE PROPERTIES

6 Months Ended

Jun. 30, 2017

Real Estate [Abstract]

SELF STORAGE PROPERTIES

SELF STORAGE PROPERTIES

Self storage properties are summarized as follows (dollars in thousands):

	June 30, 2017			December 31, 2016
Land	$	482,983		$	456,135
Buildings and improvements	1,466,155			1,383,603
Furniture and equipment	4,918			4,598
Total self storage properties	1,954,056			1,844,336
Less accumulated depreciation	(138,726		)	(110,803		)
Self storage properties, net	$	1,815,330		$	1,733,533

Depreciation expense related to self storage properties amounted to $14.3 million and $10.1 million during the three months ended June 30, 2017 and 2016, respectively, and $28.4 million and $18.8 million during the six months ended June 30, 2017 and 2016, respectively.

XML

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURE

6 Months Ended

Jun. 30, 2017

Equity Method Investments and Joint Ventures [Abstract]

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURE

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURE

As of June 30, 2017, the Company's unconsolidated real estate venture owned and operated a portfolio of 70 properties containing approximately 4.9 million rentable square feet, configured in approximately 39,000 storage units and located across 13 states. The unconsolidated real estate venture acquired four self storage properties with an estimated fair value of $49.8 million during the six months ended June 30, 2017. The unconsolidated real estate venture financed the self storage property acquisitions with capital contributions from the unconsolidated real estate venture members, of which the Company contributed $12.5 million for its 25% proportionate share in the unconsolidated real estate venture.

The following table presents the condensed financial position of the unconsolidated real estate venture as of June 30, 2017 and December 31, 2016 (in thousands):

	June 30, 2017		December 31, 2016
ASSETS
Self storage properties, net	$	655,233	$	614,754
Other assets	14,141		19,936
Total assets	$	669,374	$	634,690
LIABILITIES AND EQUITY
Debt financing	$	317,192	$	317,047
Other liabilities	5,764		4,498
Equity	346,418		313,145
Total liabilities and equity	$	669,374	$	634,690

The following table presents the condensed operating information of the unconsolidated real estate venture for the three and six months ended June 30, 2017 (in thousands):

	Three Months Ended June 30, 2017			Six Months Ended June 30, 2017
Total revenue	$	13,059		$	25,566
Property operating expenses	4,432			8,500
Net operating income	8,627			17,066
Supervisory, administrative and other expenses	(941		)	(1,839		)
Depreciation and amortization	(7,676		)	(15,165		)
Interest expense	(2,802		)	(5,628		)
Acquisition and other expenses	(267		)	(633		)
Net loss	$	(3,059	)	$	(6,199	)

XML

SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS

6 Months Ended

Jun. 30, 2017

Business Combinations [Abstract]

SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS

SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS

Acquisitions

The Company acquired 15 self storage properties with an estimated fair value of $101.9 million during the six months ended June 30, 2017. Of these acquisitions, six self storage properties with an estimated fair value of $33.4 million were acquired by the Company from its PROs. As a result of the Company's adoption of ASU 2017-01 during the six months ended June 30, 2017, the 15 self storage property acquisitions were accounted for as asset acquisitions and accordingly, $0.8 million of acquisition costs related to the acquisitions were capitalized as part of the basis of the acquired properties. The Company recognized the estimated fair value of the acquired assets and assumed liabilities on the respective dates of such acquisitions. The Company allocated the total purchase price to the estimated fair value of tangible and intangible assets acquired, and liabilities assumed. The Company allocated a portion of the purchase price to identifiable intangible assets consisting of customer in-place leases which were recorded at estimated fair value of $2.5 million, resulting in a total fair value of $99.4 million allocated to real estate.

The following table summarizes the investment in self storage property acquisitions completed by the Company during the six months ended June 30, 2017 (dollars in thousands):

Acquisitions Closed During the Three Months Ended:	Number of Properties	Summary of Investment
		Cash and Acquisition Costs		Value of OP Equity(1)		Other Liabilities		Total
March 31, 2017	5	$	26,780	$	4,964	$	183	$	31,927
June 30, 2017	10	60,672		8,931		387		69,990
Total	15	$	87,452	$	13,895	$	570	$	101,917

^{(1)  Value of OP equity represents the fair value of OP units, subordinated performance units and LTIP units.} 

Pro Forma Financial Information For 2016 Business Combinations

The Company acquired 107 self storage properties during the year ended December 31, 2016 that were accounted for as business combinations. On a pro forma basis, after giving effect to the acquisition of 100 of the 107 self storage properties as if they were acquired on January 1, 2015 (pro forma financial information is not presented for seven of the self storage properties acquired during the year ended December 31, 2016 since the information required is not available to the Company), the Company would have recorded incremental additional revenue and net income of $10.0 million and $1.9 million, respectively, for the three months ended June 30, 2016 and $25.5 million and $4.9 million for the six months ended June 30, 2016, respectively. This pro forma information was prepared using the following significant assumptions: (i) for the cash portion of the purchase price, the Company assumed borrowings under the Company's revolving line of credit with interest computed based on the effective interest rate of 1.87% as of June 30, 2016; (ii) for assumed debt financing directly associated with the acquisition of specific self storage properties, interest was computed for the entirety of the periods presented using the effective interest rates under such financings; and (iii) for acquisition costs of $1.7 million and $3.0 million incurred during the three and six months ended June 30, 2016, pro forma adjustments give effect to these costs as if they were incurred on January 1, 2015.

The pro forma information presented in the paragraph above does not purport to represent what the actual results of operations would have been for the periods indicated, nor does it purport to represent the Company's future results of operations. As described in greater detail above, given that certain information with respect to the business combinations is not available to the Company, readers of this Form 10-Q and investors are cautioned not to place undue reliance on the Company's pro forma financial information.

Dispositions

During the six months ended June 30, 2017, the Company sold to unrelated third parties three self storage properties. The gross sales price was $15.6 million and the Company recognized $5.6 million of gain on the sales.

XML

OTHER ASSETS

6 Months Ended

Jun. 30, 2017

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

OTHER ASSETS

OTHER ASSETS

Other assets consist of the following (dollars in thousands):

	June 30, 2017		December 31, 2016
Customer in-place leases, net of accumulated amortization of $8,068 and $7,831, respectively	$	4,660	$	9,374
Receivables:
Trade, net	1,766		1,898
PROs and other affiliates	739		601
Receivable from unconsolidated real estate venture	767		1,093
Property acquisition and other deposits	692		477
Interest rate swaps	7,559		8,742
Prepaid expenses and other	5,622		1,879
Corporate furniture, equipment and other, net	1,209		1,243
Trade name	3,200		3,200
Management contract, net of accumulated amortization of $502 and $148, respectively	10,119		10,473
Goodwill	5,750		5,750
Total	$	42,083	$	44,730

XML

DEBT FINANCING

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

DEBT FINANCING

DEBT FINANCING

The Company's outstanding debt as of June 30, 2017 and December 31, 2016 is summarized as follows (dollars in thousands):

	Interest Rate(1)	June 30, 2017		December 31, 2016
Credit Facility:
Revolving line of credit	2.62%	$	181,000	$	246,500
Term loan A	2.60%	235,000		225,000
Term loan B	3.24%	155,000		100,000
Term loan C	3.71%	105,000		—
Term loan facility	3.08%	100,000		100,000
Fixed rate mortgages payable	4.15%	188,932		201,694
Total principal		964,932		873,194
Unamortized debt issuance costs and debt premium, net		4,208		5,760
Total debt		$	969,140	$	878,954

^{(1)  Represents the effective interest rate as of June 30, 2017. Effective interest rate incorporates the stated rate plus the impact of interest rate cash flow hedges and discount and premium amortization, if applicable. For the revolving line of credit, the effective interest rate excludes fees for unused borrowings.} 

Credit Facility Increase

 On February 8, 2017, pursuant to a partial exercise by the Company's operating partnership of its expansion option under its amended and restated credit agreement dated as of May 6, 2016, the Company's operating partnership, as borrower, certain of its subsidiaries that are party to the amended and restated credit agreement, as subsidiary guarantors, and the Company, as parent guarantor, entered into a second increase agreement and amendment (the "Increase Agreement") with a syndicated group of lenders to increase the total borrowing capacity under the tranche A term loan facility (the "Term Loan A") and the tranche B term loan facility (the "Term Loan B") by $10.0 million and $55.0 million, respectively, and to provide a new tranche C term loan facility ("Term Loan C") in an aggregate outstanding principal amount of $105.0 million, which, in the aggregate, increased the total borrowing capacity by $170.0 million for a total unsecured credit facility of $895.0 million consisting of the following components: (i) a $400.0 million revolving line of credit (the "Revolver" and together with the Term Loan A, Term Loan B and Term Loan C, the "credit facility"), (ii) Term Loan A, which now provides for a total borrowing commitment of up to $235.0 million, (iii) Term Loan B, which now provides for a total borrowing commitment of up to $155.0 million and (iv) Term Loan C, which provides for a total borrowing commitment of up to $105.0 million. The Company continues to have an expansion option under the credit facility, which, if exercised in full, would provide for a total credit facility of $1.0 billion.

The Term Loan C matures on February 8, 2024. It is not subject to any scheduled reduction or amortization payment prior to maturity. Interest rates applicable to loans under Term Loan C are determined based on a 1, 2, 3 or 6 month London Interbank Offered Rate ("LIBOR") period (as elected by the Company at the beginning of any applicable interest period) plus an applicable margin or a base rate, determined by the greatest of the Key Bank prime rate, the federal funds rate plus 0.50% or one month LIBOR plus 1.00%, plus an applicable margin. The applicable margins for Term Loan C are leverage based and range from 1.70% to 2.25% for LIBOR loans and 0.70% to 1.25% for base rate loans; provided that after such time as the Company achieves an investment grade rating from at least two rating agencies, the Company may elect (but is not required to elect) that Term Loan C is subject to the rating based on applicable margins ranging from 1.50% to 2.45% for LIBOR Loans and 0.50% to 1.45% for base rate loans. Prepayments of any loans under Term Loan C are subject to prepayment premiums of 2.00% from the date of the Increase Agreement through and including the first anniversary of the Increase Agreement and 1.00% from the first anniversary of the Increase Agreement through and including the second anniversary of the Increase Agreement. There is no prepayment penalty thereafter. Other than the increases and amendments related to Term Loan C described above, the Increase Agreement did not impact or amend the amended and restated credit agreement's previously disclosed terms, including its covenants, events of default, or terms of payment.

As of June 30, 2017, the Company had outstanding letters of credit totaling $4.7 million and would have had the capacity to borrow remaining Revolver commitments of $214.3 million while remaining in compliance with the credit facility's financial covenants. At June 30, 2017, the Company was in compliance with all such covenants.

For a summary of the Company's financial covenants and additional detail regarding the Company's credit facility, term loan facility, and fixed rate mortgage payables, please see Note 8 to the Company's most recent Annual Report on Form 10-K filed with the Securities and Exchange Commission.

Future Debt Obligations

Based on existing debt agreements in effect as of June 30, 2017, the scheduled principal and maturity payments for the Company's outstanding borrowings are presented in the table below (in thousands):

Year Ending December 31,	Scheduled Principal and Maturity Payments		Amortization of Premium and Unamortized Debt Issuance Costs			Total
Remainder of 2017	$	2,342	$	198		$	2,540
2018	10,617		293			10,910
2019	4,983		225			5,208
2020	220,245		(127		)	220,118
2021	242,509		(215		)	242,294
2022	159,205		68			159,273
Thereafter	325,031		3,766			328,797
	$	964,932	$	4,208		$	969,140

XML

EARNINGS PER SHARE

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

EARNINGS PER SHARE

EARNINGS PER SHARE

The following table sets forth the computation of basic and diluted earnings (loss) per common share for the three and six months ended June 30, 2017 and 2016, respectively (in thousands, except per share amounts):

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Earnings (loss) per common share - basic and diluted
Numerator
Net income	$	15,576		$	6,045		$	22,757		$	10,847
Net (income) loss attributable to noncontrolling interests	(13,209		)	1,325			(19,835		)	(1,267		)
Net income attributable to National Storage Affiliates Trust	2,367			7,370			2,922			9,580
Distributed and undistributed earnings allocated to participating securities	(7		)	(5		)	(13		)	(9		)
Net income attributable to common shareholders - basic	2,360			7,365			2,909			9,571
Effect of assumed conversion of dilutive securities	—			(1,356		)	—			1,215
Net income attributable to common shareholders - diluted	$	2,360		$	6,009		$	2,909		$	10,786
Denominator
Weighted average shares outstanding - basic	44,223			23,078			43,814			23,041
Effect of dilutive securities:
Weighted average OP units outstanding	—			24,733			—			23,484
Weighted average DownREIT OP unit equivalents outstanding	—			1,835			—			1,835
Weighted average LTIP units outstanding	—			2,164			—			2,158
Weighted average subordinated performance units and DownREIT subordinated performance unit equivalents	—			21,721			—			20,245
Weighted average shares outstanding - diluted	44,223			73,531			43,814			70,763
Earnings (loss) per share - basic	$	0.05		$	0.32		$	0.07		$	0.42
Earnings (loss) per share - diluted	$	0.05		$	0.08		$	0.07		$	0.15

As discussed in Note 2, the Company allocates GAAP income (loss) utilizing the HLBV method, in which the Company allocates income or loss based on the change in each unitholders' claim on the net assets of its operating partnership at period end after adjusting for any distributions or contributions made during such period. Due to the stated liquidation priorities and because the HLBV method incorporates non-cash items such as depreciation expense, in any given period, income or loss may be allocated disproportionately to National Storage Affiliates Trust and noncontrolling interests, resulting in volatile fluctuations of basic and diluted earnings (loss) per share.

Outstanding equity interests of the operating partnership and DownREIT partnerships are considered potential common shares for purposes of calculating diluted earnings (loss) per share as the unitholders may, through the exercise of redemption rights, obtain common shares, subject to various restrictions. Basic earnings per share is calculated based on the weighted average number of common shares outstanding during the period. Diluted earnings per share is calculated by further adjusting for the dilutive impact using the treasury stock method for unvested LTIP units subject to a service condition outstanding during the period and the if-converted method for any convertible securities outstanding during the period.

Generally, following certain lock-out periods, OP units in the operating partnership are redeemable for cash or, at the Company's option, exchangeable for common shares on a one-for-one basis, subject to certain adjustments and DownREIT OP units are redeemable for cash or, at the Company's option, exchangeable for OP units in the operating partnership on a one-for-one basis, subject to certain adjustments in each case.

LTIP units may also, under certain circumstances, be convertible into OP units on a one-for-one basis, which are then exchangeable for common shares as described above. Certain LTIP units vested prior to or upon the completion of the Company's initial public offering and certain LTIP units have vested upon the satisfaction of a service condition or will vest upon the satisfaction of future service and market conditions. Vested LTIP units and unvested LTIP units that vest based on a service or market condition are allocated income or loss in a similar manner as OP units. Unvested LTIP units subject to a service or market condition are evaluated for dilution using the treasury stock method. For the three and six months ended June 30, 2017, 410,825 unvested LTIP units that vest based on a service or market condition are excluded from the calculation of diluted earnings (loss) per share as they are not dilutive to earnings (loss) per share. In addition, certain LTIP units vest upon the future acquisition of properties sourced by PROs. For the three and six months ended June 30, 2017, 236,000 unvested LTIP units that vest upon the future acquisition of properties are excluded from the calculation of diluted earnings (loss) per share because the contingency for the units to vest has not been attained as of the end of the reported periods.

Subordinated performance units may also, under certain circumstances, be convertible into OP units which are exchangeable for common shares as described above, and DownREIT subordinated performance units may, under certain circumstances, be exchangeable for subordinated performance units on a one-for-one basis. Subordinated performance units are only convertible into OP units, after a two year lock-out period and then generally (i) at the holder’s election only upon the achievement of certain performance thresholds relating to the properties to which such subordinated performance units relate or (ii) at the Company's election upon a retirement event of a PRO that holds such subordinated performance units or upon certain qualifying terminations. Although subordinated performance units may only be convertible after a two year lock-out period, the Company assumes a hypothetical conversion of each subordinated performance unit (including each DownREIT subordinated performance unit) into OP units (with subsequently assumed redemption into common shares) for the purposes of calculating diluted weighted average common shares. This hypothetical conversion is calculated using historical financial information, and as a result, is not necessarily indicative of the results of operations, cash flows or financial position of the Company upon expiration of the two-year lock out period on conversions.

For the three and six months ended June 30, 2017, potential common shares totaling 50.3 million and 50.2 million, respectively, related to OP units, DownREIT OP units, subordinated performance units and DownREIT subordinated performance units have been excluded from the calculation of diluted earnings (loss) per share as they are not dilutive to earnings (loss) per share.

Participating securities, which consist of unvested restricted common shares, receive dividends equal to those received by common shares. The effect of participating securities for the periods presented above is calculated using the two-class method of allocating distributed and undistributed earnings.

XML

RELATED PARTY TRANSACTIONS

6 Months Ended

Jun. 30, 2017

Related Party Transactions [Abstract]

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS

Supervisory and Administrative Fees

The Company has entered into asset management agreements with the PROs to continue providing leasing, operating, supervisory and administrative services related to the Company's self storage properties. The asset management agreements generally provide for fees ranging from 5% to 6% of gross revenue for the managed self storage properties. During the three months ended June 30, 2017 and 2016, the Company incurred $3.5 million and $2.7 million, respectively, for supervisory and administrative fees to the PROs and during the six months ended June 30, 2017 and 2016, the Company incurred $6.8 million and $4.9 million, respectively, for supervisory and administrative fees to the PROs. Such fees are included in general and administrative expenses in the accompanying condensed consolidated statements of operations.

Affiliate Payroll Services

The employees responsible for operation of the self storage properties are employees of the PROs who charge the Company for the costs associated with the respective employees. For the three months ended June 30, 2017 and 2016, the Company incurred $5.9 million and $4.7 million, respectively, for payroll and related costs reimbursable to these affiliates, and for the six months ended June 30, 2017 and 2016, the Company incurred $11.7 million and $8.7 million, respectively, for payroll and related costs reimbursable to these affiliates. Such costs are included in property operating expenses in the accompanying condensed consolidated statements of operations.

Due Diligence Costs

During the three months ended June 30, 2017 and 2016, the Company incurred $0.2 million and $0.2 million, respectively, of expenses payable to certain PROs related to self storage property acquisitions sourced by the PROs, and during the six months ended June 30, 2017 and 2016, the Company incurred $0.3 million and $0.3 million, respectively, of expenses payable to certain PROs related to self storage property acquisitions sourced by the PROs. These expenses, which are based on the volume of transactions sourced by the PROs, are intended to reimburse the PROs for due diligence costs incurred in the sourcing and underwriting process. For the three and six months ended June 30, 2017, these due diligence costs are capitalized as part of the basis of the acquired self storage properties and for the three and six months ended June 30, 2016, these due diligence costs are included in acquisition costs in the accompanying condensed consolidated statements of operations.

Management Fees and Other Revenue

The unconsolidated real estate venture pays certain customary fees to the Company for managing and operating the unconsolidated real estate venture properties, including property management fees, call center fees, platform fees, acquisition fees and development management fees. During the three and six months ended June 30, 2017, the Company earned $2.1 million and $4.0 million, respectively, of management fees and other revenue for managing and operating the unconsolidated real estate venture. The fees are reported in management fees and other revenue in the accompanying condensed consolidated statements of operations.

XML

COMMITMENTS AND CONTINGENCIES

6 Months Ended

Jun. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Legal Proceedings

The Company is subject to litigation, claims, and assessments that may arise in the ordinary course of its business activities. Such matters include contractual matters, employment related issues, and regulatory proceedings. Although occasional adverse decisions or settlements may occur, the Company believes that the final disposition of such matters will not have a material adverse effect on the Company's financial position, results of operations, or liquidity.

XML

FAIR VALUE MEASUREMENTS

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

Recurring Fair Value Measurements

The Company sometimes limits its exposure to interest rate fluctuations by entering into interest rate swap agreements. The interest rate swap agreements moderate the Company's exposure to interest rate risk by effectively converting the interest on variable rate debt to a fixed rate. The Company measures its interest rate swap derivatives at fair value on a recurring basis. The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges are recorded in accumulated other comprehensive income (loss) and are subsequently reclassified into earnings in the period that the hedged transaction affects earnings. The ineffective portion of the change in fair value of the derivatives is recognized directly into earnings.

Information regarding the Company's interest rate swaps measured at fair value, which are classified within Level 2 of the GAAP fair value hierarchy, is presented below (dollars in thousands):

Fair value at December 31, 2015	$	(972	)
Swap ineffectiveness	7
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss	909
Unrealized losses on interest rate swaps included in accumulated other comprehensive loss	(8,437		)
Fair value at June 30, 2016	$	(8,493	)
Fair value at December 31, 2016	$	8,159
Swap ineffectiveness	6
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss	1,530
Unrealized losses on interest rate swaps included in accumulated other comprehensive loss	(2,239		)
Fair value at June 30, 2017	$	7,456

As of June 30, 2017 and December 31, 2016, the Company had outstanding interest rate swaps with aggregate notional amounts of $595.0 million and $425.0 million, respectively, designated as cash flow hedges. As of June 30, 2017, the Company's swaps had a weighted average remaining term of approximately 4.0 years. The fair value of these swaps are presented within accounts payable and accrued liabilities and other assets in the Company's balance sheets, and the Company recognizes any changes in the fair value as an adjustment of accumulated other comprehensive income (loss) within equity to the extent of their effectiveness. If the forward rates at June 30, 2017 remain constant, the Company estimates that during the next 12 months, the Company would reclassify into earnings approximately $1.0 million of the unrealized losses included in accumulated other comprehensive income (loss). If market interest rates increase above the 1.51% weighted average fixed rate under these interest rate swaps the Company will benefit from net cash payments due to it from the counterparty to the interest rate swaps.

There were no transfers between levels during the six months ended June 30, 2017 and 2016. For financial assets and liabilities that utilize Level 2 inputs, the Company utilizes both direct and indirect observable price quotes, including LIBOR yield curves. The Company uses valuation techniques for Level 2 financial assets and liabilities which include LIBOR yield curves at the reporting date as well as assessing counterparty credit risk. Counterparties to these contracts are highly rated financial institutions. 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 the Company's derivatives utilize Level 3 inputs, such as estimates of current credit spreads, to evaluate the likelihood of default by the Company and the counterparties. As of June 30, 2017, the Company determined that the effect of credit valuation adjustments on the overall valuation of its derivative positions are not significant to the overall valuation of its derivatives. Therefore, the Company has determined that its derivative valuations are appropriately classified in Level 2 of the fair value hierarchy.

Fair Value Disclosures

The carrying values of cash and cash equivalents, restricted cash, trade receivables, and accounts payable and accrued liabilities reflected in the balance sheets at June 30, 2017 and December 31, 2016, approximate fair value due to the short term nature of these financial assets and liabilities. The carrying value of variable rate debt financing reflected in the balance sheets at June 30, 2017 and December 31, 2016 approximates fair value as the changes in their associated interest rates reflect the current market and credit risk is similar to when the loans were originally obtained.

The fair values of fixed rate mortgages were estimated using the discounted estimated future cash payments to be made on such debt; the discount rates used approximated current market rates for loans, or groups of loans, with similar maturities and credit quality (categorized within Level 2 of the fair value hierarchy). The combined principal balance of the Company's fixed rate mortgages payable was approximately $188.9 million as of June 30, 2017 with a fair value of approximately $201.8 million. In determining the fair value, the Company estimated a weighted average market interest rate of approximately 3.84%, compared to the weighted average contractual interest rate of 5.20%. The combined principal balance of the Company's fixed rate mortgages was approximately $201.7 million as of December 31, 2016 with a fair value of approximately $214.0 million. In determining the fair value as of December 31, 2016, the Company estimated a weighted average market interest rate of approximately 3.89%, compared to the weighted average contractual interest rate of 5.25%.

XML

SUBSEQUENT EVENTS

6 Months Ended

Jun. 30, 2017

Subsequent Events [Abstract]

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS

In July 2017, the Company acquired four self storage properties for approximately $40.9 million. The four self storage properties were acquired for all cash consideration from third-party sellers and the Company assumed approximately $0.2 million of other working capital liabilities. In connection with these acquisitions, the Company incurred $0.1 million of expenses, payable to certain PROs, for due diligence costs related to the self storage properties sourced by the PROs.

XML

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

6 Months Ended

Jun. 30, 2017

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying condensed consolidated financial statements are presented on the accrual basis of accounting in accordance with U.S. generally accepted accounting principles ("GAAP") and have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC") regarding interim financial reporting. Accordingly, certain information and footnote disclosures required by GAAP for complete financial statements have been condensed or omitted in accordance with such rules and regulations. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation of the condensed consolidated financial statements have been included. The Company's results of operations for the quarterly period ended June 30, 2017 are not necessarily indicative of the results to be expected for the full year or any other future period.

Principles of Consolidation and Noncontrolling Interest

Noncontrolling Interests

All of the limited partner equity interests in the operating partnership not held by the Company are reflected as noncontrolling interests. Noncontrolling interests also include ownership interests in DownREIT partnerships held by entities other than the operating partnership or its subsidiaries. In the condensed consolidated statements of operations, the Company allocates net income (loss) attributable to noncontrolling interests to arrive at net income (loss) attributable to National Storage Affiliates Trust.

For transactions that result in changes to the Company's ownership interest in its operating partnership, the carrying amount of noncontrolling interests is adjusted to reflect such changes. The difference between the fair value of the consideration received or paid and the amount by which the noncontrolling interest is adjusted is reflected as an adjustment to additional paid-in capital on the condensed consolidated balance sheets.

Principles of Consolidation

The Company's financial statements include the accounts of its operating partnership and its controlled subsidiaries. All significant intercompany balances and transactions have been eliminated in the consolidation of entities.

Variable Interest Entity

When the Company obtains an economic interest in an entity, the Company evaluates the entity to determine if the entity is deemed a variable interest entity ("VIE"), and if the Company is deemed to be the primary beneficiary, in accordance with authoritative guidance issued on the consolidation of VIEs. When an entity is not deemed to be a VIE, the Company considers the provisions of additional guidance to determine whether the general partner controls a limited partnership or similar entity when the limited partners have certain rights. The Company consolidates all entities that are VIEs and of which the Company is deemed to be the primary beneficiary. The Company has determined that its operating partnership is a VIE. The sole significant asset of National Storage Affiliates Trust is its investment in its operating partnership, and consequently, substantially all of the Company’s assets and liabilities represent those assets and liabilities of its operating partnership.

Reclassifications

Reclassifications

Certain amounts in the consolidated financial statements and related notes have been reclassified to conform to the current year presentation. Such reclassifications do not impact the Company's previously reported financial position or net income (loss).

Revenue Recognition

Revenue Recognition

Management has determined that all of the Company's leases are operating leases. Substantially all leases may be terminated on a month-to-month basis and rental income is recognized ratably over the lease term using the straight-line method. Rents received in advance are deferred and recognized on a straight-line basis over the related lease term associated with the prepayment. Promotional discounts and other incentives are recognized as a reduction to rental income over the applicable lease term. Other property-related revenue consists of ancillary revenues such as tenant insurance-related access fees and commissions and sales of storage supplies which are recognized in the period earned.

The Company recognizes gains from disposition of facilities only upon closing in accordance with the guidance on sales of real estate. Payments received from purchasers prior to closing are recorded as deposits. Profit on real estate sold is recognized using the full accrual method upon closing when the collectability of the sales price is reasonably assured and the Company is not obligated to perform significant activities after the sale. Profit may be deferred in whole or part until the sale meets the requirements of profit recognition on sales under this guidance.

The Company earns management and other fees for managing and operating its unconsolidated real estate venture. These fees include property management fees, call center fees, platform fees, acquisition fees, development fees and a portion of tenant warranty protection proceeds. The Company recognizes these fees when they are earned, fixed and determinable. The fees are reported in management fees and other revenue in the Company's condensed consolidated statements of operations.

Investments in Unconsolidated Real Estate Venture

Investments in Unconsolidated Real Estate Venture

The Company’s investment in its unconsolidated real estate venture is recorded under the equity method of accounting in the accompanying consolidated financial statements. Under the equity method, the Company’s investment in unconsolidated real estate venture is stated at cost and adjusted for the Company’s share of net earnings or losses and reduced by distributions. Equity in earnings (losses) is recognized based on the Company’s ownership interest in the earnings (losses) of the unconsolidated real estate venture. The Company follows the "look through" approach for classification of distributions from its unconsolidated real estate venture in its consolidated statements of cash flows. Under this approach, distributions are reported under operating cash flow unless the facts and circumstances of a specific distribution clearly indicate that it is a return of capital (e.g., proceeds from the unconsolidated real estate venture’s sale of assets), in which case it is reported as an investing activity.

Allocation of Net Income (Loss)

Allocation of Net Income (Loss)

The distribution rights and priorities set forth in the operating partnership's LP Agreement differ from what is reflected by the underlying percentage ownership interests of the unitholders. Accordingly, the Company allocates GAAP income (loss) utilizing the hypothetical liquidation at book value ("HLBV") method, in which the Company allocates income or loss based on the change in each unitholders’ claim on the net assets of its operating partnership at period end after adjusting for any distributions or contributions made during such period. The HLBV method is commonly applied to equity investments where cash distribution percentages vary at different points in time and are not directly linked to an equity holder’s ownership percentage.

The HLBV method is a balance sheet-focused approach to income (loss) allocation. A calculation is prepared at each balance sheet date to determine the amount that unitholders would receive if the operating partnership were to liquidate all of its assets (at GAAP net book value) and distribute the resulting proceeds to its creditors and unitholders based on the contractually defined liquidation priorities. The difference between the calculated liquidation distribution amounts at the beginning and the end of the reporting period, after adjusting for capital contributions and distributions, is used to derive each unitholder's share of the income (loss) for the period. Due to the stated liquidation priorities and because the HLBV method incorporates non-cash items such as depreciation expense, in any given period, income or loss may be allocated disproportionately to unitholders as compared to their respective ownership percentage in the operating partnership, and net income (loss) attributable to National Storage Affiliates Trust could be more or less net income than actual cash distributions received and more or less income or loss than what may be received in the event of an actual liquidation. Additionally, the HLBV method could result in net income (or net loss) attributable to National Storage Affiliates Trust during a period when the Company reports consolidated net loss (or net income), or net income (or net loss) attributable to National Storage Affiliates Trust in excess of the Company's consolidated net income (or net loss). The computations of basic and diluted earnings (loss) per share may be materially affected by these disproportionate income (loss) allocations, resulting in volatile fluctuations of basic and diluted earnings (loss) per share.

Other Comprehensive Income (Loss)

Other Comprehensive Income (Loss)

The Company has cash flow hedge derivative instruments that are measured at fair value with unrealized gains or losses recognized in other comprehensive income (loss) with a corresponding adjustment to accumulated other comprehensive income within equity, as discussed further in Note 12. Under the HLBV method of allocating income (loss) discussed above, a calculation is prepared at each balance sheet date by applying the HLBV method including, and excluding, the assets and liabilities resulting from the Company's cash flow hedge derivative instruments to determine comprehensive income (loss) attributable to National Storage Affiliates Trust. As a result of the distribution rights and priorities set forth in the operating partnership's LP Agreement, in any given period, other comprehensive income (loss) may be allocated disproportionately to unitholders as compared to their respective ownership percentage in the operating partnership and as compared to their respective allocation of net income (loss).

Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]

Restricted Cash

The Company's restricted cash consists of escrowed funds deposited with financial institutions for real estate taxes, insurance and other reserves for capital improvements in accordance with the Company's loan agreements and like-kind exchange proceeds.

Assets Held For Sale

Assets held for sale

The Company classifies properties as held for sale when certain criteria are met. At such time, the properties, including significant assets and liabilities that are expected to be transferred as part of a sale transaction, are presented separately on the condensed consolidated balance sheet at the lower of carrying value or estimated fair value less costs to sell and depreciation is no longer recognized. As of December 31, 2016 the Company had two self storage properties classified as held for sale. The results of operations for the self storage properties classified as held for sale are reflected within income from operations in the Company's condensed consolidated statements of operations.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014-09 will replace most existing revenue recognition guidance in GAAP when it becomes effective. ASU 2014-09 is effective for the Company on January 1, 2018, with early application permitted for the Company on January 1, 2017. ASU 2014-09 permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its condensed consolidated financial statements and related disclosures. Although the Company has not yet selected a transition method, as ASU 2014-09 does not impact lessor accounting, the Company does not believe the adoption of ASU 2014-09 will significantly impact its accounting for rental revenue. The Company expects that certain property-related ancillary revenues and management and other fees will be in the scope of the new guidance. Based on the Company’s ongoing evaluation, the Company does not currently anticipate material changes to its recognition of revenue as a result of adopting ASU 2014-09.

In February 2016, the FASB issued ASU 2016-02, Leases, which amends the existing guidance for accounting for leases, including requiring lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases and lessees to recognize most leases on-balance sheet as lease liabilities with corresponding right-of-use assets. ASU 2016-02 is effective for the Company on January 1, 2019, with early application permitted. ASU 2016-02 requires a modified retrospective approach, with entities applying the new guidance at the beginning of the earliest period presented in the financial statements in which they first apply the new standard, with certain elective transition relief. The Company is evaluating the effect that ASU 2016-02 will have on its operating leases, condensed consolidated financial statements and related disclosures.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows, which clarifies the classification of certain cash receipts and cash payments in the statement of cash flows, including debt prepayment or extinguishment costs, settlement of contingent consideration arising from a business combination, insurance settlement proceeds, and distributions from certain equity method investees. The Company adopted ASU 2016-15 effective January 1, 2017, which did not result in any changes to the presentation of amounts shown on the Company's condensed consolidated statements of cash flows for the six months ended June 30, 2017 and 2016.

In November 2016, the FASB issued an ASU 2016-18, Statement of Cash Flows - Restricted Cash, that requires the inclusion of restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted ASU 2016-18 effective January 1, 2017, which resulted in the inclusion of the Company's restricted cash balances along with cash and cash equivalents in the Company's condensed consolidated statement of cash flows and separate line items showing changes in restricted cash balances were eliminated from the Company's condensed consolidated statements of cash flows. ASU 2016-18 was applied retrospectively to all periods presented.

In January 2017, the FASB issued ASU 2017-01, Clarifying the Definition of a Business, which narrows the definition of a business and provides an amended framework for determining whether a transaction involves an asset or a business. The Company adopted ASU 2017-01 effective January 1, 2017. As further discussed in Note 6, as a result of the adoption of ASU 2017-01, the Company's self storage property acquisitions during the six months ended June 30, 2017 were accounted for as asset acquisitions, and accordingly, the acquisition costs related to the self storage property acquisitions were capitalized as part of the basis of the acquired properties.

XML

NONCONTROLLING INTERESTS (Tables)

6 Months Ended

Jun. 30, 2017

Noncontrolling Interest [Abstract]

Schedule of outstanding equity interests

As of June 30, 2017 and December 31, 2016, units reflecting noncontrolling interests consisted of the following:

	June 30, 2017	December 31, 2016
OP units	26,274,340	26,125,444
Subordinated performance units	11,418,815	11,022,378
LTIP units	934,323	1,543,905
DownREIT units
DownREIT OP units	1,834,786	1,834,786
DownREIT subordinated performance units	4,386,999	4,386,999
Total	44,849,263	44,913,512

XML

SELF STORAGE PROPERTIES (Tables)

6 Months Ended

Jun. 30, 2017

Real Estate [Abstract]

Schedule of self storage properties

Self storage properties are summarized as follows (dollars in thousands):

	June 30, 2017			December 31, 2016
Land	$	482,983		$	456,135
Buildings and improvements	1,466,155			1,383,603
Furniture and equipment	4,918			4,598
Total self storage properties	1,954,056			1,844,336
Less accumulated depreciation	(138,726		)	(110,803		)
Self storage properties, net	$	1,815,330		$	1,733,533

XML

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURE (Tables)

6 Months Ended

Jun. 30, 2017

Equity Method Investments and Joint Ventures [Abstract]

Schedule of condensed financial information of joint ventures

The following table presents the condensed financial position of the unconsolidated real estate venture as of June 30, 2017 and December 31, 2016 (in thousands):

	June 30, 2017		December 31, 2016
ASSETS
Self storage properties, net	$	655,233	$	614,754
Other assets	14,141		19,936
Total assets	$	669,374	$	634,690
LIABILITIES AND EQUITY
Debt financing	$	317,192	$	317,047
Other liabilities	5,764		4,498
Equity	346,418		313,145
Total liabilities and equity	$	669,374	$	634,690

The following table presents the condensed operating information of the unconsolidated real estate venture for the three and six months ended June 30, 2017 (in thousands):

	Three Months Ended June 30, 2017			Six Months Ended June 30, 2017
Total revenue	$	13,059		$	25,566
Property operating expenses	4,432			8,500
Net operating income	8,627			17,066
Supervisory, administrative and other expenses	(941		)	(1,839		)
Depreciation and amortization	(7,676		)	(15,165		)
Interest expense	(2,802		)	(5,628		)
Acquisition and other expenses	(267		)	(633		)
Net loss	$	(3,059	)	$	(6,199	)

XML

SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS (Tables)

6 Months Ended

Jun. 30, 2017

Business Combinations [Abstract]

Schedule of business combinations

The following table summarizes the investment in self storage property acquisitions completed by the Company during the six months ended June 30, 2017 (dollars in thousands):

Acquisitions Closed During the Three Months Ended:	Number of Properties	Summary of Investment
		Cash and Acquisition Costs		Value of OP Equity(1)		Other Liabilities		Total
March 31, 2017	5	$	26,780	$	4,964	$	183	$	31,927
June 30, 2017	10	60,672		8,931		387		69,990
Total	15	$	87,452	$	13,895	$	570	$	101,917

^{(1)  Value of OP equity represents the fair value of OP units, subordinated performance units and LTIP units.}

XML

OTHER ASSETS (Tables)

6 Months Ended

Jun. 30, 2017

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of other assets

Other assets consist of the following (dollars in thousands):

	June 30, 2017		December 31, 2016
Customer in-place leases, net of accumulated amortization of $8,068 and $7,831, respectively	$	4,660	$	9,374
Receivables:
Trade, net	1,766		1,898
PROs and other affiliates	739		601
Receivable from unconsolidated real estate venture	767		1,093
Property acquisition and other deposits	692		477
Interest rate swaps	7,559		8,742
Prepaid expenses and other	5,622		1,879
Corporate furniture, equipment and other, net	1,209		1,243
Trade name	3,200		3,200
Management contract, net of accumulated amortization of $502 and $148, respectively	10,119		10,473
Goodwill	5,750		5,750
Total	$	42,083	$	44,730

XML

DEBT FINANCING (Tables)

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Schedule of debt

The Company's outstanding debt as of June 30, 2017 and December 31, 2016 is summarized as follows (dollars in thousands):

	Interest Rate(1)	June 30, 2017		December 31, 2016
Credit Facility:
Revolving line of credit	2.62%	$	181,000	$	246,500
Term loan A	2.60%	235,000		225,000
Term loan B	3.24%	155,000		100,000
Term loan C	3.71%	105,000		—
Term loan facility	3.08%	100,000		100,000
Fixed rate mortgages payable	4.15%	188,932		201,694
Total principal		964,932		873,194
Unamortized debt issuance costs and debt premium, net		4,208		5,760
Total debt		$	969,140	$	878,954

^{(1)  Represents the effective interest rate as of June 30, 2017. Effective interest rate incorporates the stated rate plus the impact of interest rate cash flow hedges and discount and premium amortization, if applicable. For the revolving line of credit, the effective interest rate excludes fees for unused borrowings.}

Schedule of future debt maturities

Based on existing debt agreements in effect as of June 30, 2017, the scheduled principal and maturity payments for the Company's outstanding borrowings are presented in the table below (in thousands):

Year Ending December 31,	Scheduled Principal and Maturity Payments		Amortization of Premium and Unamortized Debt Issuance Costs			Total
Remainder of 2017	$	2,342	$	198		$	2,540
2018	10,617		293			10,910
2019	4,983		225			5,208
2020	220,245		(127		)	220,118
2021	242,509		(215		)	242,294
2022	159,205		68			159,273
Thereafter	325,031		3,766			328,797
	$	964,932	$	4,208		$	969,140

XML

EARNINGS PER SHARE (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Schedule of elements used in calculating basic and diluted earnings per common share

The following table sets forth the computation of basic and diluted earnings (loss) per common share for the three and six months ended June 30, 2017 and 2016, respectively (in thousands, except per share amounts):

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Earnings (loss) per common share - basic and diluted
Numerator
Net income	$	15,576		$	6,045		$	22,757		$	10,847
Net (income) loss attributable to noncontrolling interests	(13,209		)	1,325			(19,835		)	(1,267		)
Net income attributable to National Storage Affiliates Trust	2,367			7,370			2,922			9,580
Distributed and undistributed earnings allocated to participating securities	(7		)	(5		)	(13		)	(9		)
Net income attributable to common shareholders - basic	2,360			7,365			2,909			9,571
Effect of assumed conversion of dilutive securities	—			(1,356		)	—			1,215
Net income attributable to common shareholders - diluted	$	2,360		$	6,009		$	2,909		$	10,786
Denominator
Weighted average shares outstanding - basic	44,223			23,078			43,814			23,041
Effect of dilutive securities:
Weighted average OP units outstanding	—			24,733			—			23,484
Weighted average DownREIT OP unit equivalents outstanding	—			1,835			—			1,835
Weighted average LTIP units outstanding	—			2,164			—			2,158
Weighted average subordinated performance units and DownREIT subordinated performance unit equivalents	—			21,721			—			20,245
Weighted average shares outstanding - diluted	44,223			73,531			43,814			70,763
Earnings (loss) per share - basic	$	0.05		$	0.32		$	0.07		$	0.42
Earnings (loss) per share - diluted	$	0.05		$	0.08		$	0.07		$	0.15

XML

FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Schedule of interest rate swap derivatives fair value

Information regarding the Company's interest rate swaps measured at fair value, which are classified within Level 2 of the GAAP fair value hierarchy, is presented below (dollars in thousands):

Fair value at December 31, 2015	$	(972	)
Swap ineffectiveness	7
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss	909
Unrealized losses on interest rate swaps included in accumulated other comprehensive loss	(8,437		)
Fair value at June 30, 2016	$	(8,493	)
Fair value at December 31, 2016	$	8,159
Swap ineffectiveness	6
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss	1,530
Unrealized losses on interest rate swaps included in accumulated other comprehensive loss	(2,239		)
Fair value at June 30, 2017	$	7,456

XML

ORGANIZATION AND NATURE OF OPERATIONS (Details) storage_unit in Thousands, ft² in Millions	Jun. 30, 2017 ft² storage_unit state property
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of self storage properties owned | property	394
Number of states that self storage properties are owned in | state	21
Total rentable square feet in self storage properties | ft²	23.9
Number of storage units owned | storage_unit	190

XML

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands	Jun. 30, 2017 USD ($) partnership property	Dec. 31, 2016 USD ($) partnership property
Variable Interest Entity [Line Items]
Number of self storage properties owned | property	394
Net book value of real estate owned	$ 1,815,330	$ 1,733,533
Carrying value of fixed rate mortgages	964,932	$ 873,194
Number of properties held for sale | property		2
Mortgages [Member] | Fixed Rate Mortgages [Member]
Variable Interest Entity [Line Items]
Carrying value of fixed rate mortgages	$ 188,932	$ 201,694
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Number of partnerships considered to be VIEs | partnership	21	21
Number of self storage properties owned | property	34	34
Net book value of real estate owned	$ 252,900	$ 256,800
Variable Interest Entity, Primary Beneficiary [Member] | Mortgages [Member] | Fixed Rate Mortgages [Member]
Variable Interest Entity [Line Items]
Carrying value of fixed rate mortgages	$ 40,500	$ 41,400

XML

NONCONTROLLING INTERESTS - Equity Interests (Details) - shares	Jun. 30, 2017	Dec. 31, 2016
Partnership Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Outstanding equity interest (in shares)	44,849,263	44,913,512
OP units [Member] | NSA OP, LP [Member]
Noncontrolling Interest [Line Items]
Outstanding equity interest (in shares)	26,274,340	26,125,444
OP units [Member] | DownREIT Partnership [Member]
Noncontrolling Interest [Line Items]
Outstanding equity interest (in shares)	1,834,786	1,834,786
Subordinated performance units [Member] | NSA OP, LP [Member]
Noncontrolling Interest [Line Items]
Outstanding equity interest (in shares)	11,418,815	11,022,378
Subordinated performance units [Member] | DownREIT Partnership [Member]
Noncontrolling Interest [Line Items]
Outstanding equity interest (in shares)	4,386,999	4,386,999
LTIP units [Member] | NSA OP, LP [Member]
Noncontrolling Interest [Line Items]
Outstanding equity interest (in shares)	934,323	1,543,905

XML

NONCONTROLLING INTERESTS - Narrative (Details)	6 Months Ended
	Jun. 30, 2017 unit / shares $ / shares shares	Dec. 31, 2016 $ / shares
Class of Stock [Line Items]
Common shares of beneficial interest, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
OP units [Member] | NSA OP, LP [Member]
Class of Stock [Line Items]
Unit conversion ratio | unit / shares	1
Minimum conversion period	1 year
Redemptions of units (in shares)	1,153,518
OP units [Member] | NSA OP, LP [Member] | Self Storage Properties [Member]
Class of Stock [Line Items]
Issuance of units, (in shares)	473,533
OP units [Member] | DownREIT Partnership [Member]
Class of Stock [Line Items]
Unit conversion ratio | unit / shares	1
Minimum conversion period	5 years
Subordinated performance units [Member] | NSA OP, LP [Member]
Class of Stock [Line Items]
Unit conversion, lock out period	2 years
Subordinated performance units [Member] | NSA OP, LP [Member] | Self Storage Properties [Member]
Class of Stock [Line Items]
Issuance of units, (in shares)	96,394
Subordinated performance units [Member] | NSA OP, LP [Member] | Affiliate of Personal Mini [Member]
Class of Stock [Line Items]
Issuance of units, (in shares)	300,043
Subordinated performance units [Member] | DownREIT Partnership [Member]
Class of Stock [Line Items]
Unit conversion ratio | unit / shares	1
Minimum conversion period	5 years
LTIP units [Member]
Class of Stock [Line Items]
Issuance of units, (in shares)	219,299
LTIP units [Member] | NSA OP, LP [Member]
Class of Stock [Line Items]
Unit conversion ratio | unit / shares	1
Redemptions of units (in shares)	828,881
Conversion of units (in shares)	828,881

XML

SELF STORAGE PROPERTIES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Real Estate [Abstract]
Land	$ 482,983		$ 482,983		$ 456,135
Buildings and improvements	1,466,155		1,466,155		1,383,603
Furniture and equipment	4,918		4,918		4,598
Total self storage properties	1,954,056		1,954,056		1,844,336
Less accumulated depreciation	(138,726)		(138,726)		(110,803)
Self storage properties, net	1,815,330		1,815,330		$ 1,733,533
Depreciation expense related to self storage properties	$ 14,300	$ 10,100	$ 28,400	$ 18,800

XML

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURE (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
ASSETS
Self storage properties, net	$ 655,233	$ 655,233	$ 614,754
Other assets	14,141	14,141	19,936
Total assets	669,374	669,374	634,690
LIABILITIES AND EQUITY
Debt financing	317,192	317,192	317,047
Other liabilities	5,764	5,764	4,498
Equity	346,418	346,418	313,145
Total liabilities and equity	669,374	669,374	$ 634,690
INCOME STATEMENT
Total revenue	13,059	25,566
Property operating expenses	4,432	8,500
Net operating income	8,627	17,066
Supervisory, administrative and other expenses	(941)	(1,839)
Depreciation and amortization	(7,676)	(15,165)
Interest expense	(2,802)	(5,628)
Acquisition and other expenses	(267)	(633)
Net loss	$ (3,059)	$ (6,199)

XML

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURE - Narrative (Details) $ in Thousands, ft² in Millions	6 Months Ended
	Jun. 30, 2017 USD ($) ft² storage_unit state property	Jun. 30, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of self storage properties | property	394
Total rentable square feet in self storage properties owned by the unconsolidated real estate venture | ft²	23.9
Number of storage units owned by unconsolidated real estate venture | storage_unit	190,000
Number of states that unconsolidated real estate venture self storage properties are owned in | state	21
Contributions to unconsolidated real estate venture | $	$ 12,647	$ 0
Equity Method Investee [Member] | Real Estate Venture [Member]
Schedule of Equity Method Investments [Line Items]
Number of self storage properties | property	70
Total rentable square feet in self storage properties owned by the unconsolidated real estate venture | ft²	4.9
Number of storage units owned by unconsolidated real estate venture | storage_unit	39,000
Number of states that unconsolidated real estate venture self storage properties are owned in | state	13
Number of self storage properties acquired by unconsolidated venture | storage_unit	4
Estimated fair value of self storage properties acquired by unconsolidated real estate venture | $	$ 49,800
Contributions to unconsolidated real estate venture | $	$ 12,500
Company's proportionate share of its unconsolidated real estate venture (percent)	25.00%

XML

SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) property	Mar. 31, 2017 property	Jun. 30, 2017 USD ($) property
Business Acquisition [Line Items]
Number of self storage properties acquired | property	10	5	15
Acquisition-related costs capitalized			$ 0.8
Recognized fair value allocated to real estate	$ 99.4		$ 99.4
Number of self storage properties sold | property			3
Gross selling price of self storage properties sold	15.6		$ 15.6
Gain on sale of self storage properties			5.6
Customer In-Place Leases [Member]
Business Acquisition [Line Items]
Recognized fair value allocated to in-place leases	2.5		$ 2.5
Affiliated Entity [Member] | Participating Regional Operator [Member]
Business Acquisition [Line Items]
Number of self storage properties acquired | property			6
Estimated fair value of acquired self storage properties	33.4		$ 33.4
All 2017 Acquisitions [Member]
Business Acquisition [Line Items]
Number of self storage properties acquired | property			15
Estimated fair value of acquired self storage properties	$ 101.9		$ 101.9

XML

SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) property	Mar. 31, 2017 USD ($) property	Jun. 30, 2017 USD ($) property
Business Acquisition [Line Items]
Number of self storage properties acquired | property	10	5	15
Consideration given, cash	$ 60,672	$ 26,780	$ 87,452
Consideration given, value of OP Equity	8,931	4,964	13,895
Liabilities assumed, other	387	183	570
Total consideration given and liabilities assumed	$ 69,990	$ 31,927	$ 101,917
All 2017 Acquisitions [Member]
Business Acquisition [Line Items]
Number of self storage properties acquired | property			15

XML

SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Pro Forma Information (Details) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) property	Mar. 31, 2017 USD ($) property	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) property	Jun. 30, 2016 USD ($)	Dec. 31, 2016 property
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Number of self storage properties acquired	10	5		15
Acquisition costs | $	$ 167	$ 1,700	$ 1,708	$ 311	$ 2,996
Credit Facility [Member] | Line of Credit [Member] | Revolving line of credit [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Effective interest rate (percent)	2.62%		1.87%	2.62%	1.87%
All 2016 Acquisitions [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Number of self storage properties acquired						107
Number of businesses acquired for which pro forma financial information is available						100
Number of businesses acquired for which pro forma financial information is not available						7
Pro forma revenue | $			$ 10,000		$ 25,500
Pro forma net income (loss) | $			$ 1,900		$ 4,900

XML

OTHER ASSETS (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Receivables:
Trade, net	$ 1,766	$ 1,898
PROs and other affiliates	739	601
Receivable from unconsolidated real estate venture	767	1,093
Property acquisition and other deposits	692	477
Interest rate swaps	7,559	8,742
Prepaid expenses and other	5,622	1,879
Corporate furniture, equipment and other, net	1,209	1,243
Goodwill	5,750	5,750
Total	42,083	44,730
Customer In-Place Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets, net of amortization	4,660	9,374
Receivables:
Finite lived intangible assets, accumulated amortization	8,068	7,831
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets, net of amortization	3,200	3,200
Management Contract [Member]
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets, net of amortization	10,119	10,473
Receivables:
Finite lived intangible assets, accumulated amortization	$ 502	$ 148

XML

DEBT FINANCING - Debt Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Debt Instrument [Line Items]
Total principal	$ 964,932	$ 873,194
Unamortized debt issuance costs and debt premium, net	4,208	5,760
Total debt	$ 969,140	878,954
Line of Credit [Member] | Credit Facility [Member] | Revolving line of credit [Member]
Debt Instrument [Line Items]
Effective interest rate (percent)	2.62%		1.87%
Total principal	$ 181,000	246,500
Unsecured Debt [Member] | Credit Facility [Member] | Tranche A Term Loan [Member]
Debt Instrument [Line Items]
Effective interest rate (percent)	2.60%
Total principal	$ 235,000	225,000
Unsecured Debt [Member] | Credit Facility [Member] | Tranche B Term Loan [Member]
Debt Instrument [Line Items]
Effective interest rate (percent)	3.24%
Total principal	$ 155,000	100,000
Unsecured Debt [Member] | Credit Facility [Member] | Tranche C Term Loan [Member]
Debt Instrument [Line Items]
Effective interest rate (percent)	3.71%
Total principal	$ 105,000	0
Unsecured Debt [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Effective interest rate (percent)	3.08%
Total principal	$ 100,000	100,000
Mortgages [Member] | Fixed Rate Mortgages [Member]
Debt Instrument [Line Items]
Effective interest rate (percent)	4.15%
Total principal	$ 188,932	$ 201,694

XML

DEBT FINANCING - Future maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Scheduled Principal and Maturity Payments
Remainder of 2017	$ 2,342
2018	10,617
2019	4,983
2020	220,245
2021	242,509
2022	159,205
Thereafter	325,031
Total principal	964,932	$ 873,194
Amortization of Premium and Unamortized Debt Issuance Costs
Remainder of 2017	198
2018	293
2019	225
2020	(127)
2021	(215)
2022	68
Thereafter	3,766
Total premium amortization and unamortized debt issuance costs	4,208
Total
Remainder of 2017	2,540
2018	10,910
2019	5,208
2020	220,118
2021	242,294
2022	159,273
Thereafter	328,797
Total debt	$ 969,140	$ 878,954

XML

DEBT FINANCING - Narrative (Details) - USD ($)	Feb. 08, 2017	Jun. 30, 2017
Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,000,000,000
Unsecured Debt [Member] | Amended Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	895,000,000
Increase in credit facility	170,000,000.0
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche A Term Loan [Member]
Debt Instrument [Line Items]
Increase to maximum borrowing capacity	10,000,000
Maximum borrowing capacity	235,000,000
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche B Term Loan [Member]
Debt Instrument [Line Items]
Increase to maximum borrowing capacity	55,000,000
Maximum borrowing capacity	155,000,000
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche C Term Loan [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 105,000,000
Debt instrument, prepayment premium, first term, rate	2.00%
Debt instrument, prepayment premium, second term, rate	1.00%
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche C Term Loan [Member] | Federal Funds Effective Swap Rate [Member]
Debt Instrument [Line Items]
Borrowing rate spread	0.50%
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche C Term Loan [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Borrowing rate spread	1.00%
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche C Term Loan [Member] | Minimum [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Leverage based margin threshold	1.70%
Elective leverage based margin threshold	1.50%
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche C Term Loan [Member] | Minimum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Leverage based margin threshold	0.70%
Elective leverage based margin threshold	0.50%
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche C Term Loan [Member] | Maximum [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Leverage based margin threshold	2.25%
Elective leverage based margin threshold	2.45%
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche C Term Loan [Member] | Maximum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Leverage based margin threshold	1.25%
Elective leverage based margin threshold	1.45%
Line of Credit [Member] | Amended Credit Facility [Member] | Revolving line of credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 400,000,000
Line of Credit [Member] | Credit Facility [Member] | Revolving line of credit [Member]
Debt Instrument [Line Items]
Remaining borrowing capacity		$ 214,300,000
Line of Credit [Member] | Credit Facility [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Outstanding letters of credit		$ 4,700,000

XML

EARNINGS PER SHARE - Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator
Net income	$ 15,576	$ 6,045	$ 22,757	$ 10,847
Net (income) loss attributable to noncontrolling interests	(13,209)	1,325	(19,835)	(1,267)
Net income attributable to National Storage Affiliates Trust	2,367	7,370	2,922	9,580
Distributed and undistributed earnings allocated to participating securities	(7)	(5)	(13)	(9)
Net income attributable to common shareholders - basic	2,360	7,365	2,909	9,571
Effect of assumed conversion of dilutive securities	0	(1,356)	0	1,215
Net income attributable to common shareholders - diluted	$ 2,360	$ 6,009	$ 2,909	$ 10,786
Denominator
Weighted average shares outstanding - basic (in shares)	44,223	23,078	43,814	23,041
Effect of dilutive securities:
Weighted average shares outstanding - diluted (in shares)	44,223	73,531	43,814	70,763
Earnings (loss) per share - basic (in dollars per share)	$ 0.05	$ 0.32	$ 0.07	$ 0.42
Earnings (loss) per share - diluted (in dollars per share)	$ 0.05	$ 0.08	$ 0.07	$ 0.15
OP units [Member] | NSA OP, LP [Member]
Effect of dilutive securities:
Effect of dilutive securities (in shares)	0	24,733	0	23,484
OP units [Member] | DownREIT Partnership [Member]
Effect of dilutive securities:
Effect of dilutive securities (in shares)	0	1,835	0	1,835
LTIP units [Member] | NSA OP, LP [Member]
Effect of dilutive securities:
Effect of dilutive securities (in shares)	0	2,164	0	2,158
Subordinated performance units [Member] | NSA OP, LP And DownREIT Partnership [Member]
Effect of dilutive securities:
Effect of dilutive securities (in shares)	0	21,721	0	20,245

XML

EARNINGS PER SHARE - Narrative (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2017 shares	Jun. 30, 2017 unit / shares shares
NSA OP, LP [Member] | OP units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unit conversion ratio		1
Minimum conversion period		1 year
DownREIT Partnership [Member] | OP units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unit conversion ratio		1
Minimum conversion period		5 years
DownREIT Partnership [Member] | Subordinated performance units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unit conversion ratio		1
Minimum conversion period		5 years
NSA OP, LP And DownREIT Partnership [Member] | Subordinated performance units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unit conversion ratio		1
Minimum conversion period		2 years
Long-Term Incentive Plan Unit based on service or market condition [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average outstanding equity interests excluded from computation of diluted earnings per share (in units) | shares	410,825	410,825
Long-Term Incentive Plan Unit based on future acquisitions [Member] | Participating Regional Operator [Member] | Management [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average outstanding equity interests excluded from computation of diluted earnings per share (in units) | shares	236,000	236,000
OP units, DownREIT OP units, Subordinated performance units, DownREIT subordinated performance units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average outstanding equity interests excluded from computation of diluted earnings per share (in units) | shares	50,300,000	50,200,000

XML

RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Related Party Transaction [Line Items]
Affiliate payroll service fees reimbursed by the Company	$ 19,803	$ 15,457	$ 39,552	$ 28,734
Supervisory and Administrative Fee Agreement [Member] | Participating Regional Operator [Member] | Management [Member]
Related Party Transaction [Line Items]
Supervisory and administrative fees for PROs	3,500	2,700	6,800	4,900
Payroll Services [Member] | Participating Regional Operator [Member] | Management [Member]
Related Party Transaction [Line Items]
Affiliate payroll service fees reimbursed by the Company	5,900	4,700	11,700	8,700
Due Diligence Costs [Member] | Participating Regional Operator [Member] | Management [Member]
Related Party Transaction [Line Items]
Due diligence expenses payable to the PROs	200		300	$ 300
Due Diligence Costs [Member] | Participating Regional Operator [Member] | Management [Member] | Acquisition Costs [Member]
Related Party Transaction [Line Items]
Due diligence expenses payable to the PROs		$ 200
Customary Fees [Member] | Equity Method Investee [Member] | Management Fees And Other Revenue [Member]
Related Party Transaction [Line Items]
Management fees and other revenue from Joint Venture	$ 2,100		$ 4,000
Minimum [Member] | Supervisory and Administrative Fee Agreement [Member] | Participating Regional Operator [Member] | Management [Member]
Related Party Transaction [Line Items]
Supervisory and administrative fee agreement of gross revenue, percent			5.00%
Maximum [Member] | Supervisory and Administrative Fee Agreement [Member] | Participating Regional Operator [Member] | Management [Member]
Related Party Transaction [Line Items]
Supervisory and administrative fee agreement of gross revenue, percent			6.00%

XML

FAIR VALUE MEASUREMENTS - Interest Swap Derivatives (Details) - Interest Rate Swap [Member] - Level 2 [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis [Roll Forward]
Fair value at beginning of period	$ 8,159	$ (972)
Swap ineffectiveness	6	7
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss	1,530	909
Unrealized losses on interest rate swaps included in accumulated other comprehensive loss	(2,239)	(8,437)
Fair value of end of period	$ 7,456	$ (8,493)

XML

FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized losses forecasted to be included in earnings transferred from AOCI in the next twelve months	$ 1.0
Level 2 [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed rate mortgages, fair value disclosure	$ 201.8	$ 214.0
Weighted average market interest rate	3.84%	3.89%
Weighted average contractual interest rate	5.20%	5.25%
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount	$ 595.0	$ 425.0
Weighted average remaining term	4 years
Weighted average fixed rate	1.51%
Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed rate mortgages, fair value disclosure	$ 188.9	$ 201.7

XML

SUBSEQUENT EVENTS (Details) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2017 USD ($) property	Jun. 30, 2017 property	Mar. 31, 2017 property	Jun. 30, 2017 property
Subsequent Event [Line Items]
Number of self storage properties acquired | property		10	5	15
Subsequent Event [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Subsequent Event [Line Items]
Number of self storage properties acquired | property	4
Aggregate purchase price of properties acquired	$ 40.9
Acquisition of properties, liabilities assumed	0.2
Subsequent Event [Member] | Management [Member] | Due Diligence Costs [Member]
Subsequent Event [Line Items]
Due diligence expenses payable to the PROs	$ 0.1