10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q

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

For the quarterly period ended March 31, 2017

OR

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

For the transition period from to

Commission file number

1-10524 (UDR, Inc.)

333-156002-01 (United Dominion Realty, L.P.)

UDR, Inc.

United Dominion Realty, L.P.

(Exact name of registrant as specified in its charter)

Maryland (UDR, Inc.)	54-0857512
Delaware (United Dominion Realty, L.P.)	54-1776887
(State or other jurisdiction of	(I.R.S. Employer
incorporation of organization)	Identification No.)

1745 Shea Center Drive, Suite 200, Highlands Ranch, Colorado 80129

(Address of principal executive offices) (zip code)

(720) 283-6120

(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.

UDR, Inc.	Yes x No o
United Dominion Realty, L.P.	Yes x No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

UDR, Inc.	Yes x No o
United Dominion Realty, L.P.	Yes x No o

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

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

United Dominion Realty, L.P.:
Large accelerated filer o	Accelerated filer o	Non-accelerated filer x	Smaller reporting company o
		(Do not check if a smaller reporting company)	Emerging growth company o

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

UDR, Inc.	o
United Dominion Realty, L.P.	o

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

UDR, Inc.	Yes o No x
United Dominion Realty, L.P.	Yes o No x

The number of shares of UDR, Inc.’s common stock, $0.01 par value, outstanding as of April 21, 2017 was 267,391,715.

UDR, INC.

UNITED DOMINION REALTY, L.P.

INDEX
	PAGE
PART I — FINANCIAL INFORMATION
Item 1. Consolidated Financial Statements
UDR, INC.:
Consolidated Balance Sheets as of March 31, 2017 (unaudited) and December 31, 2016 (audited)	4
Consolidated Statements of Operations for the three months ended March 31, 2017 and 2016 (unaudited)	5
Consolidated Statements of Comprehensive Income/(Loss) for the three months ended March 31, 2017 and 2016 (unaudited)	6
Consolidated Statement of Changes in Equity for the three months ended March 31, 2017 (unaudited)	7
Consolidated Statements of Cash Flows for the three months ended March 31, 2017 and 2016 (unaudited)	8
Notes to Consolidated Financial Statements (unaudited)	9
UNITED DOMINION REALTY, L.P.:
Consolidated Balance Sheets as of March 31, 2017 (unaudited) and December 31, 2016 (audited)	36
Consolidated Statements of Operations for the three months ended March 31, 2017 and 2016 (unaudited)	37
Consolidated Statements of Comprehensive Income/(Loss) for the three months ended March 31, 2017 and 2016 (unaudited)	38
Consolidated Statement of Changes in Capital for the three months ended March 31, 2017 (unaudited)	39
Consolidated Statements of Cash Flows for the three months ended March 31, 2017 and 2016 (unaudited)	40
Notes to Consolidated Financial Statements (unaudited)	41
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	59
Item 3. Quantitative and Qualitative Disclosures About Market Risk	80
Item 4. Controls and Procedures	80
PART II — OTHER INFORMATION
Item 1. Legal Proceedings	81
Item 1A. Risk Factors	81
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	95
Item 3. Defaults Upon Senior Securities	96
Item 4. Mine Safety Disclosures	96
Item 5. Other Information	96
Item 6. Exhibits	96
Signatures	97
Exhibit 4.1
Exhibit 12.1
Exhibit 12.2
Exhibit 31.1
Exhibit 31.2
Exhibit 31.3
Exhibit 31.4
Exhibit 32.1
Exhibit 32.2
Exhibit 32.3
Exhibit 32.4

EXPLANATORY NOTE

This Report combines the quarterly reports on Form 10-Q for the quarter ended March 31, 2017 of UDR, Inc., a Maryland corporation, and United Dominion Realty, L.P., a Delaware limited partnership, of which UDR, Inc. is the parent company and sole general partner. Unless the context otherwise requires, all references in this Report to “we,” “us,” “our,” the “Company,” “UDR” or “UDR, Inc.” refer collectively to UDR, Inc., together with its consolidated subsidiaries and joint ventures, including United Dominion Realty, L.P. and UDR Lighthouse DownREIT L.P. (the “DownREIT Partnership”), both Delaware limited partnerships of which UDR is the sole general partner. Unless the context otherwise requires, the references in this Report to the “Operating Partnership” or the “OP” refer to United Dominion Realty, L.P., together with its consolidated subsidiaries. “Common stock” refers to the common stock of UDR and “stockholders” means the holders of shares of UDR’s common stock and preferred stock. The limited partnership interests of the Operating Partnership and the DownREIT Partnership are referred to as “OP Units” and “DownREIT Units,” respectively, and the holders of the OP Units and DownREIT Units are referred to as “unitholders.” This combined Form 10-Q is being filed separately by UDR and the Operating Partnership.

There are a number of differences between our Company and our Operating Partnership, which are reflected in our disclosure in this Report. UDR is a real estate investment trust (“REIT”), whose most significant asset is its ownership interest in the Operating Partnership. UDR also conducts business through other subsidiaries, including its taxable REIT subsidiaries (“TRS”). UDR acts as the sole general partner of the Operating Partnership, holds interests in subsidiaries and joint ventures, owns and operates properties, issues securities from time to time and guarantees debt of certain of our subsidiaries. The Operating Partnership conducts the operations of a substantial portion of the business and is structured as a partnership with no publicly traded equity securities. The Operating Partnership has guaranteed certain outstanding debt of UDR.

As of March 31, 2017, UDR owned 110,883 units (100%) of the general partnership interests of the Operating Partnership and 174,122,808 OP Units, representing approximately 95.0% of total outstanding OP Units in the Operating Partnership. UDR conducts a substantial amount of its business and holds a substantial amount of its assets through the Operating Partnership, and, by virtue of its ownership of the OP Units and UDR's role as the Operating Partnership’s sole general partner, UDR has the ability to control all of the day-to-day operations of the Operating Partnership. Separate financial statements and accompanying notes, as well as separate discussions under “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” are presented in this report for each of UDR and the Operating Partnership.

UDR, INC.

CONSOLIDATED BALANCE SHEETS

(In thousands, except share data)

	March 31, 2017			December 31, 2016
	(unaudited)			(audited)
ASSETS
Real estate owned:
Real estate held for investment	$	9,393,732		$	9,271,847
Less: accumulated depreciation	(3,026,660		)	(2,923,072		)
Real estate held for investment, net	6,367,072			6,348,775
Real estate under development (net of accumulated depreciation of $0 and $0, respectively)	393,837			342,282
Real estate held for disposition (net of accumulated depreciation of $0 and $553, respectively)	—			1,071
Total real estate owned, net of accumulated depreciation	6,760,909			6,692,128
Cash and cash equivalents	2,460			2,112
Restricted cash	19,757			19,994
Notes receivable, net	19,790			19,790
Investment in and advances to unconsolidated joint ventures, net	818,990			827,025
Other assets	114,005			118,535
Total assets	$	7,735,911		$	7,679,584
LIABILITIES AND EQUITY
Liabilities:
Secured debt, net	$	1,031,507		$	1,130,858
Unsecured debt, net	2,505,785			2,270,620
Real estate taxes payable	23,105			17,388
Accrued interest payable	27,887			29,257
Security deposits and prepaid rent	36,894			34,238
Distributions payable	91,436			86,936
Accounts payable, accrued expenses, and other liabilities	74,608			103,835
Total liabilities	3,791,222			3,673,132
Commitments and contingencies (Note 12)
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	904,778			909,482
Equity:
Preferred stock, no par value; 50,000,000 shares authorized:
8.00% Series E Cumulative Convertible; 2,796,903 shares issued and outstanding at March 31, 2017 and December 31, 2016	46,457			46,457
Series F; 16,155,807 and 16,196,889 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	1			1
Common stock, $0.01 par value; 350,000,000 shares authorized:
267,398,819 and 267,259,469 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	2,674			2,673
Additional paid-in capital	4,635,942			4,635,413
Distributions in excess of net income	(1,644,621		)	(1,585,825		)
Accumulated other comprehensive income/(loss), net	(4,288		)	(5,609		)
Total stockholders’ equity	3,036,165			3,093,110
Noncontrolling interests	3,746			3,860
Total equity	3,039,911			3,096,970
Total liabilities and equity	$	7,735,911		$	7,679,584

See accompanying notes to consolidated financial statements.

4

UDR, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share data)

(Unaudited)

	Three Months Ended
	March 31,
	2017			2016
REVENUES:
Rental income	$	241,271		$	231,957
Joint venture management and other fees	2,570			2,858
Total revenues	243,841			234,815
OPERATING EXPENSES:
Property operating and maintenance	39,600			39,446
Real estate taxes and insurance	30,188			28,377
Property management	6,635			6,379
Other operating expenses	1,691			1,752
Real estate depreciation and amortization	105,032			105,339
General and administrative	13,075			13,844
Casualty-related (recoveries)/charges, net	502			—
Other depreciation and amortization	1,608			1,553
Total operating expenses	198,331			196,690
Operating income	45,510			38,125
Income/(loss) from unconsolidated entities	11,198			679
Interest expense	(30,539		)	(31,104		)
Interest income and other income/(expense), net	427			431
Income/(loss) before income taxes and gain/(loss) on sale of real estate owned	26,596			8,131
Tax (provision)/benefit, net	(332		)	403
Income/(loss) from continuing operations	26,264			8,534
Gain/(loss) on sale of real estate owned, net of tax	2,132			3,070
Net income/(loss)	28,396			11,604
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(2,338		)	(905		)
Net (income)/loss attributable to noncontrolling interests	(91		)	(306		)
Net income/(loss) attributable to UDR, Inc.	25,967			10,393
Distributions to preferred stockholders — Series E (Convertible)	(929		)	(929		)
Net income/(loss) attributable to common stockholders	$	25,038		$	9,464
Common distributions declared per share	$	0.310		$	0.295
Income/(loss) per weighted average common share:
Basic	$	0.09		$	0.04
Diluted	$	0.09		$	0.04
Weighted average number of common shares outstanding:
Basic	266,790			262,456
Diluted	268,688			264,285

See accompanying notes to consolidated financial statements.

5

UDR, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS)

(In thousands)

(Unaudited)

	Three Months Ended
	March 31,
	2017			2016
Net income/(loss)	$	28,396		$	11,604
Other comprehensive income/(loss), including portion attributable to noncontrolling interests:
Other comprehensive income/(loss) - derivative instruments:
Unrealized holding gain/(loss)	632			(811		)
(Gain)/loss reclassified into earnings from other comprehensive income/(loss)	818			935
Other comprehensive income/(loss), including portion attributable to noncontrolling interests	1,450			124
Comprehensive income/(loss)	29,846			11,728
Comprehensive (income)/loss attributable to noncontrolling interests	(2,558		)	(692		)
Comprehensive income/(loss) attributable to UDR, Inc.	$	27,288		$	11,036

See accompanying notes to consolidated financial statements.

6

UDR, INC.

CONSOLIDATED STATEMENT OF CHANGES IN EQUITY

(In thousands, except per share data)

(Unaudited)

	Preferred Stock		Common Stock		Paid-in Capital			Distributions in Excess of Net Income			Accumulated Other Comprehensive Income/(Loss), net			Noncontrolling Interests			Total
Balance at December 31, 2016	$	46,458	$	2,673	$	4,635,413		$	(1,585,825	)	$	(5,609	)	$	3,860		$	3,096,970
Net income/(loss) attributable to UDR, Inc.	—		—		—			25,967			—			—			25,967
Net income/(loss) attributable to noncontrolling interests	—		—		—			—			—			101			101
Contribution of noncontrolling interests in consolidated real estate	—		—		—			—			—			125			125
Long-Term Incentive Plan Unit grants/(vestings), net	—		—		—			—			—			(340		)	(340		)
Other comprehensive income/(loss)	—		—		—			—			1,321			—			1,321
Issuance/(forfeiture) of common and restricted shares, net	—		1		(1,879		)	—			—			—			(1,878		)
Cumulative effect upon adoption of ASU 2016-09	—		—		558			(558		)	—			—			—
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership and DownREIT Partnership	—		—		1,850			—			—			—			1,850
Common stock distributions declared ($0.310 per share)	—		—		—			(82,995		)	—			—			(82,995		)
Preferred stock distributions declared-Series E ($0.3322 per share)	—		—		—			(929		)	—			—			(929		)
Adjustment to reflect redemption value of redeemable noncontrolling interests	—		—		—			(281		)	—			—			(281		)
Balance at March 31, 2017	$	46,458	$	2,674	$	4,635,942		$	(1,644,621	)	$	(4,288	)	$	3,746		$	3,039,911

See accompanying notes to consolidated financial statements.

7

UDR, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

(Unaudited)

	Three Months Ended
	March 31,
	2017			2016
Operating Activities
Net income/(loss)	$	28,396		$	11,604
Adjustments to reconcile net income/(loss) to net cash provided by/(used in) operating activities:
Depreciation and amortization	106,640			106,892
(Gain)/loss on sale of real estate owned, net of tax	(2,132		)	(3,070		)
Tax provision/(benefit), net	332			(403		)
(Income)/loss from unconsolidated entities	(11,198		)	(679		)
Return on investment in unconsolidated joint ventures	1,455			272
Amortization of share-based compensation	3,379			3,879
Other	4,264			2,497
Changes in operating assets and liabilities:
(Increase)/decrease in operating assets	3,856			(1,853		)
Increase/(decrease) in operating liabilities	(14,528		)	(6,378		)
Net cash provided by/(used in) operating activities	120,464			112,761
Investing Activities
Acquisition of real estate assets	(65,381		)	—
Proceeds from sales of real estate investments, net	3,250			21,951
Development of real estate assets	(63,022		)	(36,045		)
Capital expenditures and other major improvements — real estate assets, net of escrow reimbursement	(21,921		)	(24,917		)
Capital expenditures — non-real estate assets	(1,233		)	(664		)
Investment in unconsolidated joint ventures	(24,193		)	(13,262		)
Distributions received from unconsolidated joint ventures	9,711			7,711
Net cash provided by/(used in) investing activities	(162,789		)	(45,226		)
Financing Activities
Payments on secured debt	(99,463		)	(2,205		)
Payments on unsecured debt	—			(83,373		)
Proceeds from the issuance of unsecured debt	220,000			—
Net proceeds/(repayment) of revolving bank debt	14,790			(73,652		)
Proceeds from the issuance of common shares through public offering, net	—			173,300
Distributions paid to redeemable noncontrolling interests	(7,476		)	(7,085		)
Distributions paid to preferred stockholders	(925		)	(924		)
Distributions paid to common stockholders	(78,942		)	(72,704		)
Other	(5,311		)	(3,966		)
Net cash provided by/(used in) financing activities	42,673			(70,609		)
Net increase/(decrease) in cash and cash equivalents	348			(3,074		)
Cash and cash equivalents, beginning of period	2,112			6,742
Cash and cash equivalents, end of period	$	2,460		$	3,668
	Three Months Ended
	March 31,
	2017			2016
Supplemental Information:
Interest paid during the period, net of amounts capitalized	$	32,463		$	31,918
Cash paid/(refunds received) for income taxes	171			267
Non-cash transactions:
Transfer of investment in and advances to unconsolidated joint ventures to real estate owned	$	32,260		$	—
Vesting of LTIP Units	2,317			—
Development costs and capital expenditures incurred but not yet paid	34,336			21,220
Conversion of Operating Partnership and DownREIT Partnership noncontrolling interests to common stock (50,689 shares in 2017 and 0 shares in 2016)	1,850			—
Dividends declared but not yet paid	91,436			86,963

See accompanying notes to consolidated financial statements.

8

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2017

1. BASIS OF PRESENTATION

Basis of Presentation

UDR, Inc., collectively with our consolidated subsidiaries (“UDR,” the “Company,” “we,” “our,” or “us”), is a self-administered real estate investment trust, or REIT, that owns, operates, acquires, renovates, develops, redevelops, and manages apartment communities. The accompanying consolidated financial statements include the accounts of UDR and its subsidiaries, including United Dominion Realty, L.P. (the “Operating Partnership” or the “OP”) and UDR Lighthouse DownREIT L.P. (the “DownREIT Partnership”). As of March 31, 2017, there were 183,350,924 units in the Operating Partnership ("OP Units") outstanding, of which 174,233,691 OP Units, or 95.0%, were owned by UDR and 9,117,233 OP Units, or 5.0%, were owned by outside limited partners. As of March 31, 2017, there were 32,367,380 units in the DownREIT Partnership (“DownREIT Units”) outstanding, of which 16,532,096, or 51.1%, were owned by UDR (including 13,470,651 DownREIT Units, or 41.6%, that were held by the Operating Partnership) and 15,835,284, or 48.9%, were owned by outside limited partners. The consolidated financial statements of UDR include the noncontrolling interests of the unitholders in the Operating Partnership and DownREIT Partnership.

The accompanying interim unaudited consolidated financial statements have been prepared according to the rules and regulations of the Securities and Exchange Commission. Certain information and note disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted according to such rules and regulations, although management believes that the disclosures are adequate to make the information presented not misleading. In the opinion of management, all adjustments and eliminations necessary for the fair presentation of our financial position as of March 31, 2017, and results of operations for the three months endedMarch 31, 2017 and 2016 have been included. Such adjustments are normal and recurring in nature. The interim results presented are not necessarily indicative of results that can be expected for a full year. The accompanying interim unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes for the year ended December 31, 2016 appearing in UDR’s Annual Report on Form 10-K, filed with the Securities and Exchange Commission on February 21, 2017.

The accompanying interim unaudited consolidated financial statements are presented in accordance with U.S. generally accepted accounting principles (“GAAP”). GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the dates of the interim unaudited consolidated financial statements and the amounts of revenues and expenses during the reporting periods. Actual amounts realized or paid could differ from those estimates. All significant intercompany accounts and transactions have been eliminated in consolidation.

The Company evaluated subsequent events through the date its financial statements were issued. No significant recognized or non-recognized subsequent events were noted.

2. SIGNIFICANT ACCOUNTING POLICIES

Recent Accounting Pronouncements

In January 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2017-01, Business Combinations (Topic 805), Clarifying the Definition of a Business. The ASU changes the definition of a business to assist entities with evaluating whether a set of transferred assets is a business. As a result, the accounting for acquisitions of real estate could be impacted. The updated standard will be effective for the Company on January 1, 2018; early adoption is permitted. The ASU will be applied prospectively to any transactions occurring within the period of adoption. The Company expects that the updated standard will result in fewer acquisitions of real estate meeting the definition of a business and fewer acquisition-related costs being expensed in the period incurred.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash. The ASU addresses the presentation of restricted cash and restricted cash equivalents in the statement of cash flows. The updated standard will be effective for the Company on January 1, 2018 and must be applied retrospectively to all periods presented; early

9

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

adoption is permitted. The Company does not expect the updated standard to have a material impact on the consolidated financial statements and related disclosures.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230), Classification of Certain Cash Receipts and Cash Payments. The ASU addresses specific cash flow items with the objective of reducing existing diversity in practice, including the treatment of distributions received from equity method investees. The updated standard will be effective for the Company on January 1, 2018 and must be applied retrospectively to all periods presented; early adoption is permitted.

The Company elected to early adopt ASU 2016-15 in 2016 and elected to classify distributions received from equity method investees using the cumulative earnings approach. As a result, for the three months ended March 31, 2016, the following amounts classified under the adopted ASU as returns on investment in unconsolidated joint ventures were reclassified on the Consolidated Statements of Cash Flow (in thousands):

	Three Months Ended
	March 31, 2016
Return on investment in unconsolidated joint ventures - as previously presented	$	—
Return on investment in unconsolidated joint ventures	272
Return on investment in unconsolidated joint ventures - as presented herein	$	272
Distributions received from unconsolidated joint ventures - as previously presented	$	7,983
Return on investment in unconsolidated joint ventures	(272		)
Distributions received from unconsolidated joint ventures - as presented herein	$	7,711

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments. The standard requires entities to estimate a lifetime expected credit loss for most financial assets, including trade and other receivables, held-to-maturity debt securities, loans and other financial instruments, and to present the net amount of the financial instrument expected to be collected. The updated standard will be effective for the Company on January 1, 2020; early adoption is permitted on January 1, 2019. The Company is currently evaluating the effect that the updated standard will have on the consolidated financial statements and related disclosures.

In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718), Improvements to Employee Share-Based Payment Accounting. The ASU aims to simplify the accounting for share-based payments by amending the accounting for forfeitures, statutory tax withholding requirements, classification in the statements of cash flow and income taxes. The updated standard was effective for the Company on January 1, 2017, at which time the Company prospectively began accounting for forfeitures as incurred and began applying the updated rules for statutory withholdings. As a result of adopting the ASU, the Company recorded a one-time adjustment for existing estimated forfeitures of $0.6 million as of January 1, 2017 to Distributions in Excess of Net Income on January 1, 2017.

In February 2016, the FASB issued ASU No. 2016-02, Leases. The standard amends the existing lease accounting guidance and requires lessees to recognize a lease liability and a right-of-use asset for all leases (except for short-term leases that have a duration of one year or less) on their balance sheets. Lessees will continue to recognize lease expense in a manner similar to current accounting. For lessors, accounting for leases under the new guidance is substantially the same as in prior periods, but eliminates current real estate-specific provisions and changes the treatment of initial direct costs. Entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparable period presented, with an option to elect certain transition relief. Full retrospective application is prohibited. The standard will be effective for the Company on January 1, 2019, with early adoption permitted. While the Company is currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures, we expect to recognize right-of-use assets and related lease liabilities on our consolidated balance sheets related to ground leases on any communities where we are the lessee.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers. The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective, including industry-specific revenue guidance. The standard specifically excludes lease contracts. The ASU allows for the use of either the full or modified retrospective

10

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

transition method and will be effective for the Company on January 1, 2018, at which time the Company expects to adopt the updated standard using the modified retrospective approach. However, as the majority of the Company’s revenue is from rental income related to leases, the Company does not expect the ASU to have a material impact on the consolidated financial statements and related disclosures.

Principles of Consolidation

The Company accounts for subsidiary partnerships, joint ventures and other similar entities in which it holds an ownership interest in accordance with the consolidation guidance. The Company first evaluates whether each entity is a variable interest entity ("VIE"). Under the VIE model, the Company consolidates an entity when it has control to direct the activities of the VIE and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. Under the voting model, the Company consolidates an entity when it controls the entity through ownership of a majority voting interest.

Discontinued Operations

In accordance with GAAP, a discontinued operation represents (1) a component of an entity or group of components that has been disposed of or is classified as held for sale in a single transaction and represents a strategic shift that has or will have a major effect on an entity’s financial results, or (2) an acquired business that is classified as held for sale on the date of acquisition. A strategic shift could include a disposal of (1) a separate major line of business, (2) a separate major geographic area of operations, (3) a major equity method investment, or (4) other major parts of an entity.

We record sales of real estate that do not meet the definition of a discontinued operation in Gain/(loss) on sale of real estate owned, net of taxon the Consolidated Statements of Operations.

Revenue and Real Estate Sales Gain Recognition

Rental income related to leases is recognized on an accrual basis when due from residents and tenants in accordance with GAAP. Rental payments are generally due on a monthly basis and recognized when earned. The Company recognizes interest income, management and other fees and incentives when earned, and the amounts are fixed and determinable.

For sale transactions meeting the requirements for full accrual profit recognition, we remove the related assets and liabilities from our Consolidated Balance Sheets and record the gain or loss in the period the transaction closes. For sale transactions that do not meet the full accrual sale criteria due to our continuing involvement, we evaluate the nature of the continuing involvement and account for the transaction under an alternate method of accounting. Unless certain limited criteria are met, non-monetary transactions, including property exchanges, are accounted for at fair value.

Sales to entities in which we retain or otherwise own an interest are accounted for as partial sales. If all other requirements for recognizing profit under the full accrual method have been satisfied and no other forms of continuing involvement are present, we recognize profit proportionate to the outside interest of the buyer and defer the gain on the interest we retain. The Company recognizes any deferred gain when the property is sold to a third party. In transactions accounted for by us as partial sales, we determine if the buyer of the majority equity interest in the venture was provided a preference as to cash flows in either an operating or a capital waterfall. If a cash flow preference has been provided, we recognize profit only to the extent that proceeds from the sale of the majority equity interest exceed costs related to the entire property.

11

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

Notes Receivable

The following table summarizes our notes receivable, net as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	Interest rate at		Balance outstanding
	March 31, 2017		March 31, 2017		December 31, 2016
Note due February 2020 (a)	10.00	%	$	12,994	$	12,994
Note due July 2017 (b)	8.00	%	2,500		2,500
Note due October 2020 (c)	8.00	%	1,296		1,296
Note due April 2021 (d)	10.00	%	3,000		3,000
Total notes receivable, net			$	19,790	$	19,790

(a) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $13.0 million. Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $5.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the eighth anniversary of the date of the note (February 2020).

(b) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $2.5 million. Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $5.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (July 2017).

(c) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $2.0 million, of which, $1.3 million has been funded. Interest payments are due when the loan matures. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $10.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (October 2020).

(d) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $15.0 million, of which, $3.0 million has been funded. Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $25.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (April 2021).

The Company recognized $0.5 million and $0.4 million of interest income from notes receivable during the three months endedMarch 31, 2017 and 2016, respectively, none of which was related party interest income. Interest income is included in Interest income and other income/(expense), net on the Consolidated Statements of Operations.

Comprehensive Income/(Loss)

Comprehensive income/(loss), which is defined as the change in equity during each period from transactions and other events and circumstances from nonowner sources, including all changes in equity during a period except for those resulting from investments by or distributions to stockholders, is displayed in the accompanying Consolidated Statements of Comprehensive Income/(Loss). For the three months endedMarch 31, 2017 and 2016, the Company’s other comprehensive income/(loss) consisted of the gain/(loss) (effective portion) on derivative instruments that are designated as and qualify as cash flow hedges, (gain)/loss on derivative instruments reclassified from other comprehensive income/(loss) into earnings, and the allocation of other comprehensive income/(loss) to noncontrolling interests. The (gain)/loss on derivative instruments reclassified from other comprehensive income/(loss) is included in Interest expense on the Consolidated Statements of Operations. See Note 10, Derivatives and Hedging Activity, for further discussion. The allocation of other comprehensive income/(loss) to redeemable noncontrolling interests during the three months endedMarch 31, 2017 and 2016 was $0.1 million and $(0.5) million, respectively.

12

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

Income Taxes

Due to the structure of the Company as a REIT and the nature of the operations for the operating properties, no provision for federal income taxes has been provided for at UDR. Historically, the Company has generally incurred only state and local excise and franchise taxes. UDR has elected for certain consolidated subsidiaries to be treated as taxable REIT subsidiaries (“TRS”).

Income taxes for our TRS are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities from a change in tax rate is recognized in earnings in the period of the enactment date. The Company’s deferred tax assets are generally the result of differing depreciable lives on capitalized assets and timing of expense recognition for certain accrued liabilities. As of March 31, 2017 and December 31, 2016, UDR’s net deferred tax asset was $0.4 million and $0.6 million, respectively.

GAAP defines a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. GAAP also provides guidance on derecognition, classification, interest and penalties, accounting for interim periods, disclosure and transition.

The Company recognizes its tax positions and evaluates them using a two-step process. First, UDR determines whether a tax position is more likely than not (greater than 50 percent probability) to be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. Second, the Company will determine the amount of benefit to recognize and record the amount that is more likely than not to be realized upon ultimate settlement.

UDR had no material unrecognized tax benefit, accrued interest or penalties at March 31, 2017. UDR and its subsidiaries are subject to federal income tax as well as income tax of various state and local jurisdictions. The tax years 2013 through 2016 remain open to examination by tax jurisdictions to which we are subject. When applicable, UDR recognizes interest and/or penalties related to uncertain tax positions in Tax (provision)/benefit, net on the Consolidated Statements of Operations.

13

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

3. REAL ESTATE OWNED

Real estate assets owned by the Company consist of income producing operating properties, properties under development, land held for future development, and sold or held for disposition properties. As of March 31, 2017, the Company owned and consolidated 128 communities in 10 states plus the District of Columbia totaling 39,698 apartment homes. The following table summarizes the carrying amounts for our real estate owned (at cost) as of March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Land	$	1,812,797		$	1,801,576
Depreciable property — held and used:
Land improvements	180,837			178,701
Building, improvements, and furniture, fixtures and equipment	7,400,098			7,291,570
Under development:
Land and land improvements	111,028			111,028
Building, improvements, and furniture, fixtures and equipment	282,809			231,254
Real estate held for disposition:
Land and land improvements	—			1,104
Building, improvements, and furniture, fixtures and equipment	—			520
Real estate owned	9,787,569			9,615,753
Accumulated depreciation	(3,026,660		)	(2,923,625		)
Real estate owned, net	$	6,760,909		$	6,692,128

Acquisitions

During the three months endedMarch 31, 2017, the Company exercised its fixed-price option to purchase its joint venture partner's ownership interest in a 244 home operating community in Seattle, Washington, thereby increasing its ownership interest from 49% to 100%, for a cash purchase price of approximately $66.0 million. As a result, the Company consolidated the operating community. The Company had previously accounted for its 49% ownership interest as a preferred equity investment in an unconsolidated joint venture (see Note 5, Joint Ventures and Partnerships). As a result of the consolidation, the Company increased its real estate owned by approximately $97.0 million, recorded approximately $1.7 million of in-place lease intangibles and recorded a gain on consolidation of $12.2 million, which is included in Income/(loss) from unconsolidated entities on the Consolidated Statements of Operations.

Dispositions

During the three months endedMarch 31, 2017, the Company sold a parcel of land in Richmond, Virginia for gross proceeds of $3.5 million, resulting in net proceeds of $3.3 million and a gain of $2.1 million.

Predevelopment, development, and redevelopment projects and related costs are capitalized and reported on the Consolidated Balance Sheets as Total real estate owned, net of accumulated depreciation. The Company capitalizes costs directly related to the predevelopment, development, and redevelopment of a capital project, which include, but are not limited to, interest, real estate taxes, insurance, and allocated development and redevelopment overhead related to support costs for personnel working on the capital projects. We use our professional judgment in determining whether such costs meet the criteria for capitalization or must be expensed as incurred. These costs are capitalized only during the period in which activities necessary to ready an asset for its intended use are in progress and such costs are incremental and identifiable to a specific activity to get the asset ready for its intended use. These costs, excluding the direct costs of development and redevelopment and capitalized interest, were $2.8 million and $2.0 million for the three months endedMarch 31, 2017 and 2016, respectively. Total interest capitalized was $4.7 million and $4.2 million for the three months endedMarch 31, 2017 and 2016, respectively. As each home in a capital project is completed and becomes available for lease-up, the Company ceases capitalization on the related portion and depreciation commences over the estimated useful life.

14

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

4. VARIABLE INTEREST ENTITIES

The Company has determined that the Operating Partnership and DownREIT Partnership are VIEs as the limited partners lack substantive kick-out rights and substantive participating rights. The Company has concluded that it is the primary beneficiary of, and therefore consolidates the Operating Partnership and DownREIT Partnership based on its role as the sole general partner of the Operating Partnership and DownREIT Partnership. The Company's role as community manager and its equity interests give us the power to direct the activities that most significantly impact the economic performance and the obligation to absorb potentially significant losses or the right to receive potentially significant benefits of the Operating Partnership and DownREIT Partnership.

See the consolidated financial statements of the Operating Partnership presented within this Report and Note 4, Unconsolidated Entities, to the Operating Partnership's consolidated financial statements for the results of operations of the Operating Partnership and DownREIT Partnership, respectively.

5. JOINT VENTURES AND PARTNERSHIPS

UDR has entered into joint ventures and partnerships with unrelated third parties to acquire real estate assets that are either consolidated and included in Real estate owned on the Consolidated Balance Sheets or are accounted for under the equity method of accounting, and are included in Investment in and advances to unconsolidated joint ventures, net, on the Consolidated Balance Sheets. The Company consolidates the entities that we control as well as any variable interest entity where we are the primary beneficiary. In addition, the Company consolidates any joint venture or partnership in which we are the general partner or managing member and the third party does not have the ability to substantively participate in the decision-making process nor the ability to remove us as general partner or managing member without cause.

UDR’s joint ventures and partnerships are funded with a combination of debt and equity. Our losses are limited to our investment and except as noted below, the Company does not guarantee any debt, capital payout or other obligations associated with our joint ventures and partnerships.

The Company recognizes earnings or losses from our investments in unconsolidated joint ventures and partnerships consisting of our proportionate share of the net earnings or losses of the joint ventures and partnerships. In addition, we may earn fees for providing management services to the unconsolidated joint ventures and partnerships.

15

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

The following table summarizes the Company’s investment in and advances to unconsolidated joint ventures and partnerships, net, which are accounted for under the equity method of accounting as of March 31, 2017 and December 31, 2016(dollars in thousands):

Joint Venture	Location of Properties	Number of Properties	Number of Apartment Homes	Investment at				UDR’s Ownership Interest
		March 31, 2017	March 31, 2017	March 31, 2017		December 31, 2016		March 31, 2017			December 31, 2016
Operating and development:
UDR/MetLife I	Los Angeles, CA	1 development community (a)	150	$	29,182	$	25,209	50.0		%	50.0		%
UDR/MetLife II (b)	Various	18 operating communities	4,059	309,409		311,282		50.0		%	50.0		%
Other UDR/MetLife Development Joint Ventures		1 operating community;
	Various	4 development communities (a)	1,437	156,096		160,979		50.6		%	50.6		%
UDR/MetLife Vitruvian Park®	Addison, TX	3 operating communities;
		1 development community (a);
		5 land parcels	1,513	73,154		72,414		50.0		%	50.0		%
UDR/KFH	Washington, D.C.	3 operating communities	660	11,801		12,835		30.0		%	30.0		%
Investment in and advances to unconsolidated joint ventures, net, before participating loan investment and preferred equity investment				$	579,642	$	582,719
								Income from investments for the three months ending March 31,
				Investment at
	Location	Rate	Years To Maturity	March 31, 2017		December 31, 2016		2017			2016
Participating loan investment:
Steele Creek	Denver, CO	6.5%	0.3	$	94,002	$	94,003	$	1,533		$	1,519
Preferred equity investment:
West Coast Development Joint Ventures (c)	Various	6.5% (c)	N/A	145,346		150,303		$	12,766		$	1,427
Total investment in and advances to unconsolidated joint ventures, net				$	818,990	$	827,025

(a) The number of apartment homes for the communities under development presented in the table above is based on the projected number of total homes upon completion of development. As of March 31, 2017, 1,018 apartment homes had been completed in Other UDR/MetLife Development Joint Ventures, and no apartment homes had been completed in UDR/MetLife I or in UDR/MetLife Vitruvian Park^®.

(b) In September 2015, the 717 Olympic community, which is owned by the UDR/MetLife II joint venture, experienced extensive water damage due to a ruptured water pipe. For the three months endedMarch 31, 2017 and 2016, the Company recorded casualty-related charges/(recoveries) of $0.9 million and $(1.1) million, respectively, representing its proportionate share of the total charges/(recoveries) recognized.

16

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

(c) In May 2015, the Company entered into a joint venture agreement with an unaffiliated joint venture partner and agreed to pay $136.3 million for a 48% ownership interest in a portfolio of five communities that were under construction. The communities are located in three of the Company’s core, coastal markets: Seattle, Washington, Los Angeles and Orange County, California. UDR earns a 6.5% preferred return on its investment through each individual community’s date of stabilization, defined as when a community reaches 80% occupancy for 90 consecutive days, while the joint venture partner is allocated all operating income and expense during the pre-stabilization period. Upon stabilization, income and expense are shared based on each partner’s ownership percentage and the Company no longer receives a 6.5% preferred return on its investment in the stabilized community. The Company serves as property manager and earns a management fee during the lease-up phase and subsequent operation of each of the communities. The unaffiliated joint venture partner is the general partner of the joint venture and the developer of the communities.

At inception of the agreement, the Company had a fixed-price option to acquire the remaining interest in each community beginning one year after completion. If the options are exercised for all five communities, the Company’s total purchase price will be $597.4 million. In the event the Company does not exercise its options to purchase at least two communities, the unaffiliated joint venture partner will be entitled to earn a contingent disposition fee equal to a 6.5% return on its implied equity in the communities not acquired. The unaffiliated joint venture partner is providing certain guaranties and there are construction loans on all five communities.

During the three months endedMarch 31, 2017, the Company exercised its fixed-price option to purchase the joint venture partner’s ownership interest in one of the five communities, a 244 home operating community in Seattle, Washington, thereby increasing its ownership interest from 49% to 100%, for a cash purchase price of approximately $66.0 million. As a result, the Company consolidated the operating community and it is no longer accounted for as a preferred equity investment in an unconsolidated joint venture (see Note 4, Real Estate Owned). As a result of the consolidation, the Company recorded a gain on consolidation of $12.2 million, which is included in Income/(loss) from unconsolidated entities on the Consolidated Statements of Operations.

As of March 31, 2017, construction was completed on three of the four remaining communities. Two of the four remaining communities had achieved stabilization. The other two remaining communities have not achieved stabilization and the Company continues to receive a 6.5% preferred return on its investment in those communities.

In March 2017, the Company entered into an additional joint venture agreement with the unaffiliated joint venture partner and agreed to pay $15.5 million for a 49% ownership interest in a 155 home community that is currently under construction in Seattle, Washington (together with the May 2015 joint venture described above, the “West Coast Development Joint Ventures”). Consistent with the terms of the May 2015 joint venture agreement, UDR earns a 6.5% preferred return on its investment through the community’s date of stabilization, as defined above, while our joint venture partner is allocated all operating income and expense during the pre-stabilization period. Upon stabilization, income and expense will be shared based on each partner’s ownership percentage and the Company will no longer receive a 6.5% preferred return on its investment in the stabilized community. The Company will serve as property manager and will earn a management fee during the lease-up phase and subsequent operation of the community. The unaffiliated joint venture partner is the general partner and the developer of the community. The Company has concluded it does not control the joint venture and accounts for it under the equity method of accounting.

The Company has a fixed-price option to acquire the remaining interest in the community beginning one year after completion for a total price of $61.3 million. The unaffiliated joint venture partner is providing certain guaranties and there is a construction loan on the community.

The Company's recorded equity investment in the West Coast Development Joint Ventures at March 31, 2017 and December 31, 2016 of $145.3 million and $150.3 million, respectively, is inclusive of outside basis costs and our accrued but unpaid preferred return.

As of March 31, 2017 and December 31, 2016, the Company had deferred fees and deferred profit of $9.7 million and $9.5 million, respectively, which will be recognized through earnings over the weighted average life of the related properties, upon the disposition of the properties to a third party, or upon completion of certain development obligations.

17

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

The Company recognized management fees of $2.6 million and $2.8 million for the three months endedMarch 31, 2017 and 2016, respectively, for our management of the communities held by the joint ventures and partnerships. The management fees are included in Joint venture management and other fees on the Consolidated Statements of Operations.

The Company may, in the future, make additional capital contributions to certain of our joint ventures and partnerships should additional capital contributions be necessary to fund acquisitions or operations.

We evaluate our investments in unconsolidated joint ventures and partnerships when events or changes in circumstances indicate that there may be an other-than-temporary decline in value. We consider various factors to determine if a decrease in the value of the investment is other-than-temporary. The Company did not recognize any other-than-temporary decreases in the value of its investments in unconsolidated joint ventures or partnerships during the three months endedMarch 31, 2017 and 2016.

Combined summary balance sheets relating to the unconsolidated joint ventures and partnerships (not just our proportionate share) are presented below as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	March 31, 2017		December 31, 2016
Total real estate, net	$	2,904,183	$	2,901,067
Cash and cash equivalents	28,676		32,503
Other assets	17,288		19,047
Total assets	$	2,950,147	$	2,952,617
Amount due to/(from) UDR	$	2,746	$	521
Third party debt, net	1,811,490		1,794,379
Accounts payable and accrued liabilities	55,471		66,391
Total liabilities	$	1,869,707	$	1,861,291
Total equity	$	1,080,440	$	1,091,326

Combined summary financial information relating to the unconsolidated joint ventures’ and partnerships’ operations (not just our proportionate share) is presented below for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

	Three Months Ended
	March 31,
	2017			2016
Total revenues	$	58,524		$	55,037
Property operating expenses	(21,834		)	(23,413		)
Real estate depreciation and amortization	(23,333		)	(18,943		)
Operating income/(loss)	13,357			12,681
Interest expense	(17,690		)	(16,181		)
Net income/(loss)	$	(4,333	)	$	(3,500	)

18

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

6. SECURED AND UNSECURED DEBT, NET

The following is a summary of our secured and unsecured debt at March 31, 2017 and December 31, 2016 (dollars in thousands):

							Three Months Ended
	Principal Outstanding						March 31, 2017
	March 31, 2017			December 31, 2016			Weighted Average Interest Rate		Weighted Average Years to Maturity	Number of Communities Encumbered
Secured Debt:
Fixed Rate Debt
Mortgage notes payable (a)	$	401,135		$	402,996		4.04	%	6.1	7
Fannie Mae credit facilities (b)	355,836			355,836			5.06	%	2.6	10
Deferred financing costs	(2,482		)	(2,681		)
Total fixed rate secured debt, net	754,489			756,151			4.53	%	4.4	17
Variable Rate Debt
Tax-exempt secured notes payable (c)	94,700			94,700			1.42	%	5.9	2
Fannie Mae credit facilities (b)	182,606			280,946			2.05	%	1.3	5
Deferred financing costs	(288		)	(939		)
Total variable rate secured debt, net	277,018			374,707			1.84	%	2.9	7
Total Secured Debt, net	1,031,507			1,130,858			3.80	%	4.0	24
Unsecured Debt:
Variable Rate Debt
Borrowings outstanding under unsecured credit facility due January 2020 (d) (h)	—			—			—	%	2.8
Borrowings outstanding under unsecured commercial paper program due April 2017 (e) (h)	220,000			—			1.24	%	0.0
Borrowings outstanding under unsecured working capital credit facility due January 2019 (f)	36,140			21,350			1.88	%	1.8
Term Loan Facility due January 2021 (d) (h)	35,000			35,000			1.73	%	3.8
Fixed Rate Debt
4.25% Medium-Term Notes due June 2018 (net of discounts of $501 and $608, respectively) (h)	299,499			299,392			4.25	%	1.2
3.70% Medium-Term Notes due October 2020 (net of discounts of $28 and $30, respectively) (h)	299,972			299,970			3.70	%	3.5
2.34% Term Loan Facility due January 2021 (d) (h)	315,000			315,000			2.34	%	3.8
4.63% Medium-Term Notes due January 2022 (net of discounts of $1,715 and $1,805 respectively) (h)	398,285			398,195			4.63	%	4.8
3.75% Medium-Term Notes due July 2024 (net of discounts of $756 and $782, respectively) (h)	299,244			299,218			3.75	%	7.3
8.50% Debentures due September 2024	15,644			15,644			8.50	%	7.5
4.00% Medium-Term Notes due October 2025 (net of discounts of $585 and $602, respectively) (g) (h)	299,415			299,398			4.00	%	8.5
2.95% Medium-Term Notes due September 2026 (h)	300,000			300,000			2.95	%	9.4
Other	21			21
Deferred financing costs	(12,435		)	(12,568		)
Total Unsecured Debt, net	2,505,785			2,270,620			3.52	%	4.9
Total Debt, net	$	3,537,292		$	3,401,478		3.67	%	4.6

19

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

For purposes of classification of the above table, variable rate debt with a derivative financial instrument designated as a cash flow hedge is deemed as fixed rate debt due to the Company having effectively established a fixed interest rate for the underlying debt instrument.

Our secured debt instruments generally feature either monthly interest and principal or monthly interest-only payments with balloon payments due at maturity. As of March 31, 2017, secured debt encumbered $1.9 billion or 19.7% of UDR’s total real estate owned based upon gross book value ($7.9 billion or 80.3% of UDR’s real estate owned based on gross book value is unencumbered).

(a) At March 31, 2017, fixed rate mortgage notes payable are generally due in monthly installments of principal and interest and mature at various dates from May 2019 through November 2026 and carry interest rates ranging from 3.15% to 5.86%.

The Company will from time to time acquire properties subject to fixed rate debt instruments. In those situations, the Company records the debt at its estimated fair value and amortizes any difference between the fair value and par value to interest expense over the life of the underlying debt instrument.

During the three months endedMarch 31, 2017 and 2016, the Company had $0.7 million and $0.8 million, respectively, of amortization of the fair market adjustment of debt assumed in the acquisition of properties, which was included in Interest expenseon the Consolidated Statements of Operations. The unamortized fair market adjustment was a net premium of $10.4 million and $11.2 million at March 31, 2017 and December 31, 2016, respectively.

(b) UDR had three secured credit facilities with Fannie Mae with an aggregate commitment of $538.4 million at March 31, 2017. The Fannie Mae credit facilities mature at various dates from May 2017 through July 2020 and bear interest at floating and fixed rates. At March 31, 2017, $355.8 million of the outstanding balance was fixed and had a weighted average interest rate of 5.06% and the remaining balance of $182.6 million had a weighted average variable interest rate of 2.05%. During the three months endedMarch 31, 2017, the Company prepaid $98.3 million of its secured credit facilities with borrowings under the Company's unsecured commercial paper program.

Further information related to these credit facilities is as follows (dollars in thousands):

	March 31, 2017			December 31, 2016
Borrowings outstanding	$	538,442		$	636,782
Weighted average borrowings during the period ended	604,002			737,802
Maximum daily borrowings during the period ended	636,782			813,544
Weighted average interest rate during the period ended	3.9		%	3.9		%
Weighted average interest rate at the end of the period	4.0		%	3.8		%

(c) The variable rate mortgage notes payable that secure tax-exempt housing bond issues mature in August 2019 and March 2032. Interest on these notes is payable in monthly installments. The variable rate mortgage notes have interest rates ranging from 1.39% to 1.44% as of March 31, 2017.

(d) The Company has a $1.1 billion unsecured revolving credit facility (the “Revolving Credit Facility”) and a $350.0 million unsecured term loan facility (the “Term Loan Facility”). The credit agreement for these facilities (the "Credit Agreement") allows the total commitments under the Revolving Credit Facility and the total borrowings under the Term Loan Facility to be increased to an aggregate maximum amount of up to $2.0 billion, subject to certain conditions, including obtaining commitments from any one or more lenders. The Revolving Credit Facility has a scheduled maturity date of January 31, 2020, with twosix-month extension options, subject to certain conditions. The Term Loan Facility has a scheduled maturity date of January 29, 2021.     

Based on the Company’s current credit rating, the Revolving Credit Facility has an interest rate equal to LIBOR plus a margin of 90 basis points and a facility fee of 15 basis points, and the Term Loan Facility has an interest rate equal to LIBOR plus a margin of 95 basis points. Depending on the Company’s credit rating, the margin under the Revolving Credit Facility ranges from 85 to 155 basis points, the facility fee ranges from 12.5 to 30 basis points, and the margin under the Term Loan Facility ranges from 90 to 175 basis points.

20

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

The Credit Agreement contains customary representations and warranties and financial and other affirmative and negative covenants. The Credit Agreement also includes customary events of default, in certain cases subject to customary periods to cure. The occurrence of an event of default, following the applicable cure period, would permit the lenders to, among other things, declare the unpaid principal, accrued and unpaid interest and all other amounts payable under the Credit Agreement to be immediately due and payable.

The following is a summary of short-term bank borrowings under the Revolving Credit Facility at March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Total revolving credit facility	$	1,100,000		$	1,100,000
Borrowings outstanding at end of period (1)	—			—
Weighted average daily borrowings during the period ended	9,222			161,505
Maximum daily borrowings during the period ended	120,000			340,000
Weighted average interest rate during the period ended	1.6		%	1.4		%
Interest rate at end of the period	—		%	—		%

(1) Excludes $2.9 million and $2.9 million of letters of credit at March 31, 2017 and December 31, 2016, respectively.

(e) On January 23, 2017, the Company entered into an unsecured commercial paper program. Under the terms of the program, the Company may issue unsecured commercial paper up to a maximum aggregate amount outstanding of $500 million. The notes are sold under customary terms in the United States commercial paper market and rank pari passu with all of the Company’s other unsecured indebtedness. The notes are fully and unconditionally guaranteed by the Operating Partnership.

The following is a summary of short-term bank borrowings under the unsecured commercial paper program at March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Total unsecured commercial paper program	$	500,000		$	—
Borrowings outstanding at end of period	220,000			—
Weighted average daily borrowings during the period ended	80,228			—
Maximum daily borrowings during the period ended	220,000			—
Weighted average interest rate during the period ended	1.2		%	—		%
Interest rate at end of the period	1.2		%	—		%

(f) The Company has a working capital credit facility, which provides for a $75 million unsecured revolving credit facility (the “Working Capital Credit Facility”) with a scheduled maturity date of January 1, 2019. Based on the Company’s current credit rating, the Working Capital Credit Facility has an interest rate equal to LIBOR plus a margin of 90 basis points. Depending on the Company’s credit rating, the margin ranges from 85 to 155 basis points.

21

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

The following is a summary of short-term bank borrowings under the Working Capital Credit Facility at March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Total revolving working capital credit facility	$	75,000		$	75,000
Borrowings outstanding at end of period	36,140			21,350
Weighted average daily borrowings during the period ended	26,714			21,936
Maximum daily borrowings during the period ended	67,799			69,633
Weighted average interest rate during the period ended	1.7		%	1.4		%
Interest rate at end of the period	1.9		%	1.7		%

(g) The Company previously entered into forward starting interest rate swaps to hedge against interest rate risk on $200 million of this debt. The all-in weighted average interest rate, inclusive of the impact of these interest rate swaps, was 4.55%.

(h) The Operating Partnership is a guarantor of this debt.

The aggregate maturities, including amortizing principal payments of unsecured and secured debt, of total debt for the next ten calendar years subsequent to March 31, 2017 are as follows (dollars in thousands):

Year	Total Fixed Secured Debt		Total Variable Secured Debt			Total Secured Debt		Total Unsecured Debt			Total Debt
2017	$	3,310	$	46,568		$	49,878	$	220,000		$	269,878
2018	74,637		136,038			210,675		300,000			510,675
2019	249,395		67,700			317,095		36,140			353,235
2020	198,076		—			198,076		300,000			498,076
2021	1,117		—			1,117		350,000			351,117
2022	1,157		—			1,157		400,000			401,157
2023	41,245		—			41,245		—			41,245
2024	—		—			—		315,644			315,644
2025	127,600		—			127,600		300,000			427,600
2026	50,000		—			50,000		300,000			350,000
Thereafter	—		27,000			27,000		—			27,000
Subtotal	746,537		277,306			1,023,843		2,521,784			3,545,627
Non-cash (a)	7,952		(288		)	7,664		(15,999		)	(8,335		)
Total	$	754,489	$	277,018		$	1,031,507	$	2,505,785		$	3,537,292

(a) Includes the unamortized balance of fair market value adjustments, premiums/discounts and deferred financing costs. For the three months endedMarch 31, 2017 and 2016, the Company amortized $1.1 million and $1.3 million, respectively, of deferred financing costs into Interest expense.

We were in compliance with the covenants of our debt instruments at March 31, 2017.

22

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

7. INCOME/(LOSS) PER SHARE

The following table sets forth the computation of basic and diluted income/(loss) per share for the periods presented (dollars and shares in thousands, except per share data):

	Three Months Ended
	March 31,
	2017			2016
Numerator for income/(loss) per share:
Income/(loss) from continuing operations	$	26,264		$	8,534
Gain/(loss) on sale of real estate owned, net of tax	2,132			3,070
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(2,338		)	(905		)
Net (income)/loss attributable to noncontrolling interests	(91		)	(306		)
Net income/(loss) attributable to UDR, Inc.	25,967			10,393
Distributions to preferred stockholders — Series E (Convertible)	(929		)	(929		)
Income/(loss) attributable to common stockholders - basic and diluted	$	25,038		$	9,464
Denominator for income/(loss) per share:
Weighted average common shares outstanding	267,402			263,355
Non-vested restricted stock awards	(612		)	(899		)
Denominator for basic income/(loss) per share	266,790			262,456
Incremental shares issuable from assumed conversion of stock options, unvested LTIP Units and unvested restricted stock	1,898			1,829
Denominator for diluted income/(loss) per share	268,688			264,285
Income/(loss) per weighted average common share:
Basic	$	0.09		$	0.04
Diluted	$	0.09		$	0.04

Basic income/(loss) per common share is computed based upon the weighted average number of common shares outstanding. Diluted income/(loss) per common share is computed based upon the weighted average number of common shares outstanding plus the common shares issuable from the assumed conversion of the OP Units and DownREIT Units, convertible preferred stock, stock options, unvested long-term incentive plan units ("LTIP Units") and unvested restricted stock. Only those instruments having a dilutive impact on our basic income/(loss) per share are included in diluted income/(loss) per share during the periods. For the three months endedMarch 31, 2017 and 2016, the effect of the conversion of the OP Units, DownREIT Units and convertible preferred stock was not dilutive and therefore not included in the above calculation.

The following table sets forth the additional shares of common stock outstanding by equity instrument if converted to common stock for each of the three months endedMarch 31, 2017 and 2016(shares in thousands):

	Three Months Ended
	March 31,
	2017	2016
OP/DownREIT Units	24,962	25,191
Convertible preferred stock	3,028	3,028
Stock options, unvested LTIP Units and unvested restricted stock	1,898	1,829

23

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

8. NONCONTROLLING INTERESTS

Redeemable Noncontrolling Interests in the Operating Partnership and DownREIT Partnership

Interests in the Operating Partnership and the DownREIT Partnership held by limited partners are represented by OP Units and DownREIT Units, respectively. The income is allocated to holders of OP Units/DownREIT Units based upon net income attributable to common stockholders and the weighted average number of OP Units/DownREIT Units outstanding to total common shares plus OP Units/DownREIT Units outstanding during the period. Capital contributions, distributions, and profits and losses are allocated to noncontrolling interests in accordance with the terms of the partnership agreements of the Operating Partnership and the DownREIT Partnership.

Limited partners of the Operating Partnership and the DownREIT Partnership have the right to require such partnership to redeem all or a portion of the OP Units/DownREIT Units held by the limited partner at a redemption price equal to and in the form of the Cash Amount (as defined in the partnership agreement of the Operating Partnership or the DownREIT Partnership, as applicable), provided that such OP Units/DownREIT Units have been outstanding for at least one year, subject to certain exceptions. UDR, as the general partner of the Operating Partnership and the DownREIT Partnership may, in its sole discretion, purchase the OP Units/DownREIT Units by paying to the limited partner either the Cash Amount or the REIT Share Amount (generally one share of common stock of the Company for each OP Unit/DownREIT Unit), as defined in the partnership agreement of the Operating Partnership or the DownREIT Partnership, as applicable. Accordingly, the Company records the OP Units/DownREIT Units outside of permanent equity and reports the OP Units/DownREIT Units at their redemption value using the Company’s stock price at each balance sheet date.

The following table sets forth redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership for the following period (dollars in thousands):

Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership, December 31, 2016	$	909,482
Mark-to-market adjustment to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	281
Conversion of OP Units/DownREIT Units to Common Stock	(1,850		)
Net income/(loss) attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	2,338
Distributions to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(7,919		)
Vesting of Long-Term Incentive Plan Units	2,317
Allocation of other comprehensive income/(loss)	129
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership, March 31, 2017	$	904,778

Noncontrolling Interests

Noncontrolling interests represent interests of unrelated partners and unvested LTIP Units in certain consolidated affiliates, and is presented as part of equity in the Consolidated Balance Sheets since these interests are not redeemable. During the three months endedMarch 31, 2017 and 2016, Net (income)/loss attributable to noncontrolling interests was $(0.1) million and $(0.3) million, respectively.

The Company grants LTIP Units to certain employees and non-employee directors. The LTIP Units represent an ownership interest in the Operating Partnership and have vesting terms of between one and three years, specific to the individual grants.

Noncontrolling interests related to long-term incentive plan units represent the unvested LTIP Units of these employees and non-employee directors in the Operating Partnership. The net income/(loss) allocated to the unvested LTIP Units is included in Net (income)/loss attributable to noncontrolling interests on the Consolidated Statements of Operations.

24

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

9. FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS

Fair value is based on the price that would be received to sell an asset or the exit price that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three-level valuation hierarchy prioritizes observable and unobservable inputs used to measure fair value. The fair value hierarchy consists of three broad levels, which are described below:

• Level 1 — Quoted prices in active markets for identical assets or liabilities that the entity has the ability to access.

• Level 2 — Observable inputs other than prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated with observable market data.

• Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.

The estimated fair values of the Company’s financial instruments either recorded or disclosed on a recurring basis as of March 31, 2017 and December 31, 2016 are summarized as follows (dollars in thousands):

					Fair Value at March 31, 2017, Using
	Total Carrying Amount in Statement of Financial Position at March 31, 2017		Fair Value Estimate at March 31, 2017		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Description:
Notes receivable (a)	$	19,790	$	19,735	$	—	$	—	$	19,735
Derivatives - Interest rate contracts (b)	5,067		5,067		—		5,067		—
Total assets	$	24,857	$	24,802	$	—	$	5,067	$	19,735
Derivatives - Interest rate contracts (b)	$	9	$	9	$	—	$	9	$	—
Secured debt instruments - fixed rate: (c)
Mortgage notes payable	401,135		395,504		—		—		395,504
Fannie Mae credit facilities	355,836		365,391		—		—		365,391
Secured debt instruments - variable rate: (c)
Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
Fannie Mae credit facilities	182,606		182,606		—		—		182,606
Unsecured debt instruments: (c)
Working capital credit facility	36,140		36,140		—		—		36,140
Commercial paper program	220,000		220,000		—		—		220,000
Unsecured notes	2,262,059		2,302,863		—		—		2,302,863
Total liabilities	$	3,552,485	$	3,597,213	$	—	$	9	$	3,597,204
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (d)	$	904,778	$	904,778	$	—	$	904,778	$	—

25

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

					Fair Value at December 31, 2016, Using
	Total Carrying Amount in Statement of Financial Position at December 31, 2016		Fair Value Estimate at December 31, 2016		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Description:
Notes receivable (a)	$	19,790	$	19,645	$	—	$	—	$	19,645
Derivatives - Interest rate contracts (b)	4,360		4,360		—		4,360		—
Total assets	$	24,150	$	24,005	$	—	$	4,360	$	19,645
Derivatives- Interest rate contracts (b)	$	413	$	413	$	—	$	413	$	—
Secured debt instruments - fixed rate: (c)
Mortgage notes payable	402,996		396,045		—		—		396,045
Fannie Mae credit facilities	355,836		365,693		—		—		365,693
Secured debt instruments - variable rate: (c)
Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
Fannie Mae credit facilities	280,946		280,946		—		—		280,946
Unsecured debt instruments: (c)
Working capital credit facility	21,350		21,350		—		—		21,350
Unsecured notes	2,261,838		2,304,492		—		—		2,304,492
Total liabilities	$	3,418,079	$	3,463,639	$	—	$	413	$	3,463,226
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (d)	$	909,482	$	909,482	$	—	$	909,482	$	—

(a)See Note 2, Significant Accounting Policies.

(b)See Note 10, Derivatives and Hedging Activity.

(c)See Note 6, Secured Debt and Unsecured Debt, Net.

(d)See Note 8, Noncontrolling Interests.

There were no transfers into or out of any of the levels of the fair value hierarchy during the three months endedMarch 31, 2017.

Financial Instruments Carried at Fair Value

The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. The fair values of interest rate options are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates rise above the strike rate of the caps. The variable interest rates used in the calculation of projected receipts on the cap are based on an expectation of future interest rates derived from observable market interest rate curves and volatilities.

The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees.

26

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of March 31, 2017 and December 31, 2016, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. In conjunction with the FASB’s fair value measurement guidance, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.

Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership have a redemption feature and are marked to their redemption value. The redemption value is based on the fair value of the Company’s common stock at the redemption date, and therefore, is calculated based on the fair value of the Company’s common stock at the balance sheet date. Since the valuation is based on observable inputs such as quoted prices for similar instruments in active markets, redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership are classified as Level 2.

Financial Instruments Not Carried at Fair Value

At March 31, 2017 and December 31, 2016, the fair values of cash and cash equivalents, restricted cash, accounts receivable, prepaids, real estate taxes payable, accrued interest payable, security deposits and prepaid rent, distributions payable and accounts payable approximated their carrying values because of the short term nature of these instruments. The estimated fair values of other financial instruments were determined by the Company using available market information and appropriate valuation methodologies. Considerable judgment is necessary to interpret market data and develop estimated fair values. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Company would realize on the disposition of the financial instruments. The use of different market assumptions or estimation methodologies may have a material effect on the estimated fair value amounts.

We estimate the fair value of our notes receivable and debt instruments by discounting the remaining cash flows of the debt instrument at a discount rate equal to the replacement market credit spread plus the corresponding treasury yields. Factors considered in determining a replacement market credit spread include general market conditions, borrower specific credit spreads, time remaining to maturity, loan-to-value ratios and collateral quality, where applicable (Level 3).

We record impairment losses on long-lived assets used in operations when events and circumstances indicate that the assets might be impaired and the undiscounted cash flows estimated to be generated by the future operation and disposition of those assets are less than the net book value of those assets. Our cash flow estimates are based upon historical results adjusted to reflect our best estimate of future market and operating conditions and our estimated holding periods. The net book value of impaired assets is reduced to fair value. Our estimates of fair value represent our best estimate based upon Level 3 inputs such as industry trends and reference to market rates and transactions.

We consider various factors to determine if a decrease in the value of our investment in and advances to unconsolidated joint ventures, net is other-than-temporary. These factors include, but are not limited to, age of the venture, our intent and ability to retain our investment in the entity, the financial condition and long-term prospects of the entity, and the relationships with the other joint venture partners and its lenders. Based on the significance of the unobservable inputs, we classify these fair value measurements within Level 3 of the valuation hierarchy. The Company did not incur any other-than-temporary decrease in the value of its investments in unconsolidated joint ventures during the three months endedMarch 31, 2017 and 2016.

After determining an other-than-temporary decrease in the value of an equity method investment has occurred, we estimate the fair value of our investment by estimating the proceeds we would receive upon a hypothetical liquidation of the investment at the date of measurement. Inputs reflect management’s best estimate of what market participants would use in pricing the investment giving consideration to the terms of the joint venture agreement and the estimated discounted future cash flows to be generated from the underlying joint venture assets. The inputs and assumptions utilized to estimate the future cash flows of the underlying assets are based upon the Company’s evaluation of the economy, market trends, operating results, and other factors, including judgments regarding costs to complete any construction activities, lease up and occupancy rates, rental rates, inflation rates, capitalization rates utilized to estimate the projected cash flows at the disposition, and discount rates.

27

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

10. DERIVATIVES AND HEDGING ACTIVITY

Risk Management Objective of Using Derivatives

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

Cash Flow Hedges of Interest Rate Risk

The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps and caps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. Interest rate caps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty if interest rates rise above the strike rate on the contract in exchange for an up-front premium.

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in Accumulated other comprehensive income/(loss), net in the Consolidated Balance Sheets and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During the three months endedMarch 31, 2017 and 2016, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. During the three months endedMarch 31, 2017, the Company recognized a loss of less than $0.1 million reclassified from Accumulated OCI to Interest expense due to the de-designation of a cash flow hedge and recorded no other ineffectiveness to earnings. During the three months endedMarch 31, 2016, the Company recorded no ineffectiveness to earnings.

Amounts reported in Accumulated other comprehensive income/(loss), net in the Consolidated Balance Sheets related to derivatives that will be reclassified to interest expense as interest payments are made on the Company’s variable-rate debt. Through March 31,2018, the Company estimates that an additional $0.5 million will be reclassified as an increase to interest expense.

As of March 31, 2017, the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate swaps (a)	4	$	315,000
Interest rate caps	2	$	203,166

(a) Of the four interest rate swaps noted in the table above, two swaps with an aggregate notional value of $215.0 million mature in April 2017 and two swaps with an aggregate notional value of $100.0 million mature in January 2020. The Company has entered into two forward starting interest rate swaps with an aggregate notional value of $215.0 million and a maturity in January 2020, which are effective upon the expiration of the swaps maturing in April 2017.

Derivatives not designated as hedges are not speculative and are used to manage the Company’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in a loss of less than $0.1 million for the three months endedMarch 31, 2017 and 2016.

28

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

As of March 31, 2017, the Company had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate caps	3	$	133,107

Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheet

The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	Asset Derivatives (included in Other assets)				Liability Derivatives (included in Other liabilities)
	Fair Value at:				Fair Value at:
	March 31, 2017		December 31, 2016		March 31, 2017		December 31, 2016
Derivatives designated as hedging instruments:
Interest rate products	$	5,067	$	4,359	$	9	$	413
Derivatives not designated as hedging instruments:
Interest rate products	$	—	$	1	$	—	$	—

Tabular Disclosure of the Effect of Derivative Instruments on the Consolidated Statements of Operations

The tables below present the effect of the Company’s derivative financial instruments on the Consolidated Statements of Operations for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

Derivatives in Cash Flow Hedging Relationships	Unrealized holding gain/(loss) Recognized in OCI (Effective Portion)					Gain/(Loss) Reclassified from Accumulated OCI into Interest expense (Effective Portion)						Gain/(Loss) Recognized in Interest expense (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	2017		2016			2017			2016			2017			2016
Three Months Ended March 31,
Interest rate products	$	632	$	(811	)	$	(764	)	$	(935	)	$	(54	)	$	—

	Gain/(Loss) Recognized in Interest income and other income/(expense), net
Derivatives Not Designated as Hedging Instruments	2017			2016
Three Months Ended March 31,
Interest rate products	$	(1	)	$	—

Credit-risk-related Contingent Features

The Company has agreements with some of its derivative counterparties that contain a provision where (1) if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations; or (2) the Company could be declared in default on its derivative obligations if repayment of the underlying indebtedness is accelerated by the lender due to the Company’s default on the indebtedness.

Certain of the Company’s agreements with its derivative counterparties contain provisions where, if there is a change in the Company’s financial condition that materially changes the Company’s creditworthiness in an adverse manner, the

29

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

Company may be required to fully collateralize its obligations under the derivative instrument. At March 31, 2017 and December 31, 2016, no cash collateral was posted or required to be posted by the Company or by a counterparty.

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

The Company has certain agreements with some of its derivative counterparties that contain a provision where, in the event of default by the Company or the counterparty, the right of setoff may be exercised. Any amount payable to one party by the other party may be reduced by its setoff against any amounts payable by the other party. Events that give rise to default by either party may include, but are not limited to, the failure to pay or deliver payment under the derivative agreement, the failure to comply with or perform under the derivative agreement, bankruptcy, a merger without assumption of the derivative agreement, or in a merger, a surviving entity's creditworthiness is materially weaker than the original party to the derivative agreement.

As of March 31, 2017, the fair value of derivatives was in a net asset position, which includes accrued interest but excludes any adjustment for nonperformance risk related to these agreements, of $4.9 million. As of March 31, 2017, the Company has not posted any collateral related to these agreements.

Tabular Disclosure of Offsetting Derivatives

The Company has elected not to offset derivative positions in the consolidated financial statements. The tables below present the effect on its financial position had the Company made the election to offset its derivative positions as of March 31, 2017 and December 31, 2016(dollars in thousands):

Offsetting of Derivative Assets
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Financial Instruments			Cash Collateral Received		Net Amount
March 31, 2017	$	5,067	$	—	$	5,067	$	(5	)	$	—	$	5,062
December 31, 2016	$	4,360	$	—	$	4,360	$	(221	)	$	—	$	4,139

(a) Amounts reconcile to the aggregate fair value of derivative assets in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

Offsetting of Derivative Liabilities
	Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (a)		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Financial Instruments			Cash Collateral Posted		Net Amount
March 31, 2017	$	9	$	—	$	9	$	(5	)	$	—	$	4
December 31, 2016	$	413	$	—	$	413	$	(221	)	$	—	$	192

(a) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

30

11. STOCK BASED COMPENSATION

The Company recognized stock based compensation expense, inclusive of awards granted to our independent directors, net of capitalization, of $3.4 million and $3.9 million during the three months endedMarch 31, 2017 and 2016, respectively.

12. COMMITMENTS AND CONTINGENCIES

Commitments

Real Estate Under Development

The following summarizes the Company’s real estate commitments at March 31, 2017 (dollars in thousands):

	Number of Properties	Costs Incurred to Date (a)			Expected Costs to Complete			Average Ownership Stake
Wholly-owned — under development	2	$	393,837	(b)	$	314,663		100	%
Wholly-owned — redevelopment	1	3,699		(b)	5,801			100	%
Joint ventures:
Unconsolidated joint ventures	6	721,462			66,525		(c)	50	%
Participating loan investments	1	94,002		(d)	—		(e)	0	%
Preferred equity investments	2	42,013		(f)	—			49	%
Total		$	1,255,013		$	386,989

(a) Represents 100% of project costs incurred as of March 31, 2017.

(b) Costs incurred as of March 31, 2017 include $25.3 million and $0.7 million of accruedfixed assets for development and redevelopment, respectively.

(c) Represents UDR’s proportionate share of expected remaining costs to complete the developments.

(d) Represents the participating loan balance funded as of March 31, 2017.

(e) Represents UDR's remaining participating loan commitment for Steele Creek.

(f) Represents UDR's investment in the West Coast Development Joint Ventures for the properties under development as of March 31, 2017.

Contingencies

Litigation and Legal Matters

The Company is subject to various legal proceedings and claims arising in the ordinary course of business. The Company cannot determine the ultimate liability with respect to such legal proceedings and claims at this time. The Company believes that such liability, to the extent not provided for through insurance or otherwise, will not have a material adverse effect on our financial condition, results of operations or cash flow.

13. REPORTABLE SEGMENTS

GAAP guidance requires that segment disclosures present the measure(s) used by the chief operating decision maker to decide how to allocate resources and for purposes of assessing such segments’ performance. UDR’s chief operating decision maker is comprised of several members of its executive management team who use several generally accepted industry financial measures to assess the performance of the business for our reportable operating segments.

UDR owns and operates multifamily apartment communities that generate rental and other property related income through the leasing of apartment homes to a diverse base of tenants. The primary financial measures for UDR’s apartment communities are rental income and net operating income (“NOI”). Rental income represents gross market rent less adjustments

31

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

for concessions, vacancy loss and bad debt. NOI is defined as rental income less direct property rental expenses. Rental expenses include real estate taxes, insurance, personnel, utilities, repairs and maintenance, administrative and marketing. Excluded from NOI is property management expense, which is calculated as 2.75% of property revenue to cover the regional supervision and accounting costs related to consolidated property operations, and land rent. UDR’s chief operating decision maker utilizes NOI as the key measure of segment profit or loss.

UDR’s two reportable segments are Same-Store Communities and Non-Mature Communities/Other:

• Same-Store Communities represent those communities acquired, developed, and stabilized prior to January 1, 2016 and held as of March 31, 2017. A comparison of operating results from the prior year is meaningful as these communities were owned and had stabilized occupancy and operating expenses as of the beginning of the prior period, there is no plan to conduct substantial redevelopment activities, and the community is not held for disposition within the current year. A community is considered to have stabilized occupancy once it achieves 90% occupancy for at least three consecutive months.

• Non-Mature Communities/Other represent those communities that do not meet the criteria to be included in Same-Store Communities, including, but not limited to, recently acquired, developed and redeveloped communities, and the non-apartment components of mixed use properties.

Management evaluates the performance of each of our apartment communities on a Same-Store Community and Non-Mature Community/Other basis, as well as individually and geographically. This is consistent with the aggregation criteria under GAAP as each of our apartment communities generally has similar economic characteristics, facilities, services, and tenants. Therefore, the Company’s reportable segments have been aggregated by geography in a manner identical to that which is provided to the chief operating decision maker.

All revenues are from external customers and no single tenant or related group of tenants contributed 10% or more of UDR’s total revenues during the three months endedMarch 31, 2017 and 2016.

32

UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

The following table details rental income and NOI for UDR’s reportable segments for the three months endedMarch 31, 2017 and 2016, and reconciles NOI to Net Income/(Loss) Attributable to UDR, Inc. in the Consolidated Statements of Operations (dollars in thousands):

	Three Months Ended
	March 31, (a)
	2017			2016
Reportable apartment home segment rental income
Same-Store Communities
West Region	$	82,220		$	78,409
Mid-Atlantic Region	52,109			50,154
Northeast Region	37,921			36,460
Southeast Region	28,657			27,137
Southwest Region	10,679			10,125
Non-Mature Communities/Other	29,685			29,672
Total segment and consolidated rental income	$	241,271		$	231,957
Reportable apartment home segment NOI
Same-Store Communities
West Region	$	61,895		$	59,146
Mid-Atlantic Region	36,315			33,729
Northeast Region	26,901			26,360
Southeast Region	19,661			18,797
Southwest Region	6,678			6,331
Non-Mature Communities/Other	20,033			19,771
Total segment and consolidated NOI	171,483			164,134
Reconciling items:
Joint venture management and other fees	2,570			2,858
Property management	(6,635		)	(6,379		)
Other operating expenses	(1,691		)	(1,752		)
Real estate depreciation and amortization	(105,032		)	(105,339		)
General and administrative	(13,075		)	(13,844		)
Casualty-related (charges)/recoveries, net	(502		)	—
Other depreciation and amortization	(1,608		)	(1,553		)
Income/(loss) from unconsolidated entities	11,198			679
Interest expense	(30,539		)	(31,104		)
Interest income and other income/(expense), net	427			431
Tax (provision)/benefit, net	(332		)	403
Gain/(loss) on sale of real estate owned, net of tax	2,132			3,070
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(2,338		)	(905		)
Net (income)/loss attributable to noncontrolling interests	(91		)	(306		)
Net income/(loss) attributable to UDR, Inc.	$	25,967		$	10,393

(a) Same-Store Community population consisted of 35,689 apartment homes.

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UDR, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

MARCH 31, 2017

The following table details the assets of UDR’s reportable segments as of March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Reportable apartment home segment assets:
Same-Store Communities:
West Region	$	2,944,437		$	2,938,073
Mid-Atlantic Region	2,221,312			2,216,067
Northeast Region	1,858,432			1,857,193
Southeast Region	750,147			746,762
Southwest Region	283,979			283,260
Non-Mature Communities/Other	1,729,262			1,574,398
Total segment assets	9,787,569			9,615,753
Accumulated depreciation	(3,026,660		)	(2,923,625		)
Total segment assets — net book value	6,760,909			6,692,128
Reconciling items:
Cash and cash equivalents	2,460			2,112
Restricted cash	19,757			19,994
Notes receivable, net	19,790			19,790
Investment in and advances to unconsolidated joint ventures, net	818,990			827,025
Other assets	114,005			118,535
Total consolidated assets	$	7,735,911		$	7,679,584

Capital expenditures related to our Same-Store Communities totaled $15.3 million and $12.9 million for the three months endedMarch 31, 2017 and 2016, respectively. Capital expenditures related to our Non-Mature Communities/Other totaled $0.8 million and $2.7 million for the three months endedMarch 31, 2017 and 2016, respectively.

Markets included in the above geographic segments are as follows:

i. West Region — San Francisco, Orange County, Seattle, Los Angeles, Monterey Peninsula, Other Southern California and Portland

ii. Mid-Atlantic Region — Metropolitan D.C., Richmond and Baltimore

iii. Northeast Region — New York and Boston

iv. Southeast Region — Orlando, Tampa, Nashville and Other Florida

v. Southwest Region — Dallas and Austin

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UNITED DOMINION REALTY, L.P.

CONSOLIDATED BALANCE SHEETS

(In thousands, except for unit data)

	March 31, 2017			December 31, 2016
	(unaudited)			(audited)
ASSETS
Real estate owned:
Real estate held for investment	$	3,686,334		$	3,674,704
Less: accumulated depreciation	(1,445,528		)	(1,408,815		)
Total real estate owned, net of accumulated depreciation	2,240,806			2,265,889
Cash and cash equivalents	864			756
Restricted cash	12,141			11,694
Investment in unconsolidated entities	103,267			112,867
Other assets	21,475			24,329
Total assets	$	2,378,553		$	2,415,535
LIABILITIES AND CAPITAL
Liabilities:
Secured debt, net	$	336,240		$	433,974
Notes payable due to the General Partner	273,334			273,334
Real estate taxes payable	8,409			2,104
Accrued interest payable	1,184			1,410
Security deposits and prepaid rent	15,874			14,593
Distributions payable	57,025			54,192
Accounts payable, accrued expenses, and other liabilities	14,239			17,429
Total liabilities	706,305			797,036
Commitments and contingencies (Note 10)
Capital:
Partners’ capital:
General partner:
110,883 OP Units outstanding at March 31, 2017 and December 31, 2016	1,000			1,026
Limited partners:
183,240,041 and 183,167,815 OP Units outstanding at March 31, 2017 and December 31, 2016, respectively	1,535,939			1,577,289
Accumulated other comprehensive income/(loss), net	(53		)	(113		)
Total partners’ capital	1,536,886			1,578,202
Advances (to)/from the General Partner	114,380			19,659
Noncontrolling interests	20,982			20,638
Total capital	1,672,248			1,618,499
Total liabilities and capital	$	2,378,553		$	2,415,535

See accompanying notes to the consolidated financial statements.

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UNITED DOMINION REALTY, L.P.

CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per unit data)

(Unaudited)

	Three Months Ended
	March 31,
	2017			2016
REVENUES:
Rental income	$	102,605		$	98,786
OPERATING EXPENSES:
Property operating and maintenance	16,518			16,060
Real estate taxes and insurance	11,024			10,174
Property management	2,822			2,717
Other operating expenses	1,548			1,500
Real estate depreciation and amortization	36,879			36,791
General and administrative	5,219			5,421
Casualty-related (recoveries)/charges, net	553			—
Total operating expenses	74,563			72,663
Operating income	28,042			26,123
Income/(loss) from unconsolidated entities	(5,424		)	(13,387		)
Interest expense	(5,558		)	(4,552		)
Interest expense on note payable due to the General Partner	(3,053		)	(3,053		)
Net income/(loss)	14,007			5,131
Net (income)/loss attributable to noncontrolling interests	(350		)	(344		)
Net income/(loss) attributable to OP unitholders	$	13,657		$	4,787
Net income/(loss) per weighted average OP Unit - basic and diluted	$	0.07		$	0.03
Weighted average OP Units outstanding - basic and diluted	183,324			183,279

See accompanying notes to the consolidated financial statements.

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UNITED DOMINION REALTY, L.P.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS)

(In thousands)

(Unaudited)

	Three Months Ended
	March 31,
	2017			2016
Net income/(loss)	$	14,007		$	5,131
Other comprehensive income/(loss), including portion attributable to noncontrolling interests:
Other comprehensive income/(loss) - derivative instruments:
Unrealized holding gain/(loss)	—			(2		)
(Gain)/loss reclassified into earnings from other comprehensive income/(loss)	54			1
Other comprehensive income/(loss), including portion attributable to noncontrolling interests	54			(1		)
Comprehensive income/(loss)	14,061			5,130
Comprehensive (income)/loss attributable to noncontrolling interests	(350		)	(344		)
Comprehensive income/(loss) attributable to OP unitholders	$	13,711		$	4,786

See accompanying notes to consolidated financial statements.

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UNITED DOMINION REALTY, L.P.

CONSOLIDATED STATEMENT OF CHANGES IN CAPITAL

(In thousands)

(Unaudited)

	Class A Limited Partners			Limited Partners and LTIP Units			UDR, Inc.						Accumulated Other Comprehensive Income/(Loss), net			Total Partners’ Capital			Advances (to)/from General Partner		Noncontrolling Interests
							Limited Partner			General Partner														Total
Balance at December 31, 2016	$	63,901		$	269,928		$	1,243,460		$	1,026		$	(113	)	$	1,578,202		$	19,659	$	20,638		$	1,618,499
Net income/(loss)	130			549			12,970			8			—			13,657			—		350			14,007
Distributions	(582		)	(2,428		)	(53,980		)	(34		)	—			(57,024		)	—		—			(57,024		)
Adjustment to reflect limited partners’ capital at redemption value	67			(2,965		)	2,898			—			—			—			—		—			—
Long-Term Incentive Plan Unit grants	—			1,991			—			—			—			1,991			—		—			1,991
Unrealized gain/(loss) on derivative financial investments	—			—			—			—			60			60			—		(6		)	54
Net change in advances (to)/from the General Partner	—			—			—			—			—			—			94,721		—			94,721
Balance at March 31, 2017	$	63,516		$	267,075		$	1,205,348		$	1,000		$	(53	)	$	1,536,886		$	114,380	$	20,982		$	1,672,248

See accompanying notes to the consolidated financial statements.

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UNITED DOMINION REALTY, L.P.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

(Unaudited)

	Three Months Ended
	March 31,
	2017			2016
Operating Activities
Net income/(loss)	$	14,007		$	5,131
Adjustments to reconcile net income/(loss) to net cash provided by/(used in) operating activities:
Depreciation and amortization	36,879			36,791
(Income)/loss from unconsolidated entities	5,424			13,387
Other	1,491			684
Changes in operating assets and liabilities:
(Increase)/decrease in operating assets	1,977			(3,742		)
Increase/(decrease) in operating liabilities	4,122			8,274
Net cash provided by/(used in) operating activities	63,900			60,525
Investing Activities
Capital expenditures and other major improvements — real estate assets, net of escrow reimbursement	(12,149		)	(10,744		)
Distributions received from unconsolidated entities	4,176			3,977
Net cash provided by/(used in) investing activities	(7,973		)	(6,767		)
Financing Activities
Advances (to)/from the General Partner, net	45,088			(53,157		)
Payments on secured debt	(98,340		)	(275		)
Distributions paid to partnership unitholders	(2,567		)	(2,327		)
Net cash provided by/(used in) financing activities	(55,819		)	(55,759		)
Net increase/(decrease) in cash and cash equivalents	108			(2,001		)
Cash and cash equivalents, beginning of period	756			3,103
Cash and cash equivalents, end of period	$	864		$	1,102
Supplemental Information:
Interest paid during the period, net of amounts capitalized	$	7,066		$	5,515
Non-cash transactions:
Development costs and capital expenditures incurred but not yet paid	$	4,816		$	4,505
LTIP Unit grants	1,991			663
Dividends declared but not yet paid	57,025			54,173

See accompanying notes to the consolidated financial statements.

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UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

MARCH 31, 2017

1. CONSOLIDATION AND BASIS OF PRESENTATION

Basis of Presentation

United Dominion Realty, L.P. (“UDR, L.P.,” the “Operating Partnership,” “we” or “our”) is a Delaware limited partnership, that owns, acquires, renovates, redevelops, manages, and disposes of multifamily apartment communities generally located in high barrier to entry markets located in the United States. The high barrier to entry markets are characterized by limited land for new construction, difficult and lengthy entitlement process, expensive single-family home prices and significant employment growth potential. UDR, L.P. is a subsidiary of UDR, Inc. (“UDR” or the “General Partner”), a self-administered real estate investment trust, or REIT, through which UDR conducts a significant portion of its business. During both the three months endedMarch 31, 2017 and 2016, rental revenues of the Operating Partnership represented 43% of the General Partner’s consolidated rental revenues. As of March 31, 2017, the Operating Partnership’s apartment portfolio consisted of 54 communities located in 14 markets consisting of 16,698 apartment homes.

Interests in UDR, L.P. are represented by operating partnership units (“OP Units”). The Operating Partnership’s net income is allocated to the partners, which is initially based on their respective distributions made during the year and secondly, their percentage interests. Distributions are made in accordance with the terms of the Amended and Restated Agreement of Limited Partnership of United Dominion Realty, L.P. (the “Operating Partnership Agreement”), on a per unit basis that is generally equal to the dividend per share on UDR’s common stock, which is publicly traded on the New York Stock Exchange (“NYSE”) under the ticker symbol “UDR.”

As of March 31, 2017, there were 183,350,924 OP Units outstanding, of which 174,233,691, or 95.0%, were owned by UDR and affiliated entities and 9,117,233, or 5.0%, were owned by non-affiliated limited partners. See Note 9, Capital Structure.

The accompanying interim unaudited consolidated financial statements have been prepared according to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and note disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted according to such rules and regulations, although management believes that the disclosures are adequate to make the information presented not misleading. In the opinion of management, all adjustments and eliminations necessary for the fair presentation of our financial position as of March 31, 2017, and results of operations for the three months endedMarch 31, 2017 and 2016 have been included. Such adjustments are normal and recurring in nature. The interim results presented are not necessarily indicative of results that can be expected for a full year. The accompanying interim unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes for the year ended December 31, 2016 included in the Annual Report on Form 10-K filed by UDR and the Operating Partnership with the SEC on February 21, 2017.

The accompanying interim unaudited consolidated statements are presented in accordance with U.S. generally accepted accounting principles (“GAAP”). GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the dates of the interim unaudited consolidated financial statements and the amounts of revenues and expenses during the reporting periods. Actual amounts realized or paid could differ from those estimates. All intercompany accounts and transactions have been eliminated in consolidation.

The Operating Partnership evaluated subsequent events through the date its financial statements were issued. No recognized or non-recognized subsequent events were noted.

2. SIGNIFICANT ACCOUNTING POLICIES

Recent Accounting Pronouncements

In January 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2017-01, Business Combinations (Topic 805), Clarifying the Definition of a Business. The ASU changes the definition of a business to assist entities with evaluating whether a set of transferred assets is a business. As a result, the accounting for acquisitions of real estate could be impacted. The updated standard will be effective for the Operating Partnership on January 1, 2018; early adoption is permitted. The ASU will be applied prospectively to any transactions occurring within the period of

41

UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

adoption. The Operating Partnership expects that the updated standard will result in fewer acquisitions of real estate meeting the definition of a business and fewer acquisition-related costs being expensed in the period incurred.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash. The ASU addresses the presentation of restricted cash and restricted cash equivalents in the statement of cash flows. The updated standard will be effective for the Operating Partnership on January 1, 2018 and must be applied retrospectively to all periods presented; early adoption is permitted. The Operating Partnership does not expect the updated standard to have a material impact on the consolidated financial statements and related disclosures.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230), Classification of Certain Cash Receipts and Cash Payments. The ASU addresses specific cash flow items with the objective of reducing existing diversity in practice, including the treatment of distributions received from equity method investees. The updated standard will be effective for the Operating Partnership on January 1, 2018 and must be applied retrospectively to all periods presented; early adoption is permitted. The Operating Partnership elected to early adopt ASU 2016-15 in 2016. The adoption did not have an impact on the Operating Partnership's consolidated financial statements and related disclosures.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments. The standard requires entities to estimate a lifetime expected credit loss for most financial assets, including trade and other receivables, held-to-maturity debt securities, loans and other financial instruments, and to present the net amount of the financial instrument expected to be collected. The updated standard will be effective for the Operating Partnership on January 1, 2020; early adoption is permitted on January 1, 2019. The Operating Partnership is currently evaluating the effect that the updated standard will have on the consolidated financial statements and related disclosures.

In February 2016, the FASB issued ASU No. 2016-02, Leases. The standard amends the existing lease accounting guidance and requires lessees to recognize a lease liability and a right-of-use asset for all leases (except for short-term leases that have a duration of one year or less) on their balance sheets. Lessees will continue to recognize lease expense in a manner similar to current accounting. For lessors, accounting for leases under the new guidance is substantially the same as in prior periods, but eliminates current real estate-specific provisions and changes the treatment of initial direct costs. Entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparable period presented, with an option to elect certain transition relief. Full retrospective application is prohibited. The standard will be effective for the Operating Partnership on January 1, 2019, with early adoption permitted. While the Operating Partnership is currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures, we expect to recognize right-of-use assets and related lease liabilities on our consolidated balance sheets related to ground leases on any communities where we are the lessee.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers. The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective, including industry-specific revenue guidance. The standard specifically excludes lease contracts. The ASU allows for the use of either the full or modified retrospective transition method and will be effective for the Operating Partnership on January 1, 2018, at which time the Operating Partnership expects to adopt the updated standard using the modified retrospective approach. However, as the majority of the Operating Partnership's revenue is from rental income related to leases, the Operating Partnership does not expect the ASU to have a material impact on the consolidated financial statements and related disclosures.

Principles of Consolidation

The Operating Partnership accounts for subsidiary partnerships, joint ventures and other similar entities in which it holds an ownership interest in accordance with the amended consolidation guidance. The Operating Partnership first evaluates whether each entity is a variable interest entity ("VIE"). Under the VIE model, the Operating Partnership consolidates an entity when it has control to direct the activities of the VIE and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. Under the voting model, the Operating Partnership consolidates an entity when it controls the entity through ownership of a majority voting interest.

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UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

Discontinued Operations

In accordance with GAAP, a discontinued operation represents (1) a component of an entity or group of components that has been disposed of or is classified as held for sale in a single transaction and represents a strategic shift that has or will have a major effect on an entity’s financial results, or (2) an acquired business that is classified as held for sale on the date of acquisition. A strategic shift could include a disposal of (1) a separate major line of business, (2) a separate major geographic area of operations, (3) a major equity method investment, or (4) other major parts of an entity.

We record sales of real estate that do not meet the definition of a discontinued operation in Gain/(loss) on sale of real estate owned, net of taxon the Consolidated Statements of Operations.

Income/(Loss) Per Operating Partnership Unit

Basic income/(loss) per OP Unit is computed by dividing net income/(loss) attributable to the general and limited partner unitholders by the weighted average number of general and limited partner units outstanding during the year. Diluted income/(loss) per OP Unit reflects the potential dilution that could occur if securities or other contracts to issue OP Units were exercised or converted into OP Units or resulted in the issuance of OP Units and then shared in the income/(loss) of the Operating Partnership.

Revenue and Real Estate Sales Gain Recognition

Rental income related to leases is recognized on an accrual basis when due from residents and tenants in accordance with GAAP. Rental payments are generally due on a monthly basis and recognized when earned. The Operating Partnership recognizes interest income, fees and incentives when earned, fixed and determinable.

For sale transactions meeting the requirements for full accrual profit recognition, we remove the related assets and liabilities from our Consolidated Balance Sheets and record the gain or loss in the period the transaction closes. For sale transactions that do not meet the full accrual sale criteria due to our continuing involvement, we evaluate the nature of the continuing involvement and account for the transaction under an alternate method of accounting. Unless certain limited criteria are met, non-monetary transactions, including property exchanges, are accounted for at fair value.

Sales to entities in which we or our General Partner retain or otherwise own an interest are accounted for as partial sales. If all other requirements for recognizing profit under the full accrual method have been satisfied and no other forms of continuing involvement are present, we recognize profit proportionate to the outside interest in the buyer and defer the gain on the interest we or our General Partner retain. The Operating Partnership recognizes any deferred gain when the property is sold to a third party. In transactions accounted by us as partial sales, we determine if the buyer of the majority equity interest in the venture was provided a preference as to cash flows in either an operating or a capital waterfall. If a cash flow preference has been provided, we recognize profit only to the extent that proceeds from the sale of the majority equity interest exceed costs related to the entire property.

Comprehensive Income/(Loss)

Comprehensive income/(loss), which is defined as the change in equity during each period from transactions and other events and circumstances from nonowner sources, including all changes in equity during a period except for those resulting from investments by or distributions to unitholders, is displayed in the accompanying Consolidated Statements of Comprehensive Income/(Loss). For the three months endedMarch 31, 2017 and 2016, the Operating Partnership’s other comprehensive income/(loss) consisted of the gain/(loss) (effective portion) on derivative instruments that are designated as and qualify as cash flow hedges and (gain)/loss reclassified from other comprehensive income/(loss) into earnings. The (gain)/loss reclassified from other comprehensive income/(loss) is included in Interest expense on the Consolidated Statements of Operations. See Note 8, Derivatives and Hedging Activity, for further discussion.

43

UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

Income Taxes

The taxable income or loss of the Operating Partnership is reported on the tax returns of the partners. Accordingly, no provision has been made in the accompanying financial statements for federal or state income taxes on income that is passed through to the partners. However, any state or local revenue, excise or franchise taxes that result from the operating activities of the Operating Partnership are recorded at the entity level. The Operating Partnership’s tax returns are subject to examination by federal and state taxing authorities. Net income for financial reporting purposes differs from the net income for income tax reporting purposes primarily due to temporary differences, principally real estate depreciation and the tax deferral of certain gains on property sales. The differences in depreciation result from differences in the book and tax basis of certain real estate assets and the differences in the methods of depreciation and lives of the real estate assets.

The Operating Partnership evaluates the accounting and disclosure of tax positions taken or expected to be taken in the course of preparing the Operating Partnership’s tax returns to determine whether the tax positions are “more-likely-than-not” of being sustained by the applicable tax authority. Tax positions not deemed to meet the more-likely-than-not threshold would be recorded as a tax benefit or expense in the current year. Management of the Operating Partnership is required to analyze all open tax years, as defined by the statute of limitations, for all major jurisdictions, which include federal and certain states. The Operating Partnership has no examinations in progress and none are expected at this time.

Management of the Operating Partnership has reviewed all open tax years (2013 through 2016) of tax jurisdictions and concluded there is no tax liability resulting from unrecognized tax benefits relating to uncertain income tax positions taken or expected to be taken in future tax returns.

3. REAL ESTATE OWNED

Real estate assets owned by the Operating Partnership consist of income producing operating properties, properties under development, land held for future development, and sold or held for disposition properties. At March 31, 2017, the Operating Partnership owned and consolidated 54 communities in eight states plus the District of Columbia totaling 16,698 apartment homes. The following table summarizes the carrying amounts for our real estate owned (at cost) as of March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Land	$	837,945		$	836,644
Depreciable property — held and used:
Buildings, improvements, and furniture, fixtures and equipment	2,848,389			2,838,060
Real estate owned	3,686,334			3,674,704
Accumulated depreciation	(1,445,528		)	(1,408,815		)
Real estate owned, net	$	2,240,806		$	2,265,889

The Operating Partnership did not have any acquisitions or sales of real estate during the three months endedMarch 31, 2017.

Predevelopment, development, and redevelopment projects and related costs are capitalized and reported on the Consolidated Balance Sheets asTotal real estate owned, net of accumulated depreciation. The Operating Partnership capitalizes costs directly related to the predevelopment, development, and redevelopment of a capital project, which include, but are not limited to, interest, real estate taxes, insurance, and allocated development and redevelopment overhead related to support costs for personnel working on the capital projects. We use our professional judgment in determining whether such costs meet the criteria for capitalization or must be expensed as incurred. These costs are capitalized only during the period in which activities necessary to ready an asset for its intended use are in progress and such costs are incremental and identifiable to a specific activity to get the asset ready for its intended use. These costs, excluding the direct costs of development and redevelopment and capitalized interest, were $0.3 million and $0.3 million for the three months endedMarch 31, 2017 and 2016, respectively. Total interest capitalized was less than $0.1 million and $0.1 million for the three months endedMarch 31, 2017 and 2016, respectively. As each home in a capital project is completed and becomes available for lease-up, the Operating Partnership ceases capitalization on the related portion and depreciation commences over the estimated useful life.

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UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

4. UNCONSOLIDATED ENTITIES

The DownREIT Partnership is accounted for by the Operating Partnership under the equity method of accounting and is included in Investment in unconsolidated entities on the Consolidated Balance Sheets. The Operating Partnership recognizes earnings or losses from its investments in unconsolidated entities consisting of our proportionate share of the net earnings or losses of the partnership in accordance with the Partnership Agreement.

The DownREIT Partnership is a VIE as the limited partners lack substantive kick-out rights and substantive participating rights. The Operating Partnership is not the primary beneficiary of the DownREIT Partnership as it lacks the power to direct the activities that most significantly impact its economic performance and will continue to account for its interest as an equity method investment. See Note 2, Significant Accounting Policies.

As of March 31, 2017, the DownREIT Partnership owned 13 communities with 6,261 apartment homes. The Operating Partnership’s investment in the DownREIT Partnership was $103.3 million and $112.9 million as of March 31, 2017 and December 31, 2016, respectively.

Combined summary balance sheets relating to all of the DownREIT Partnership (not just our proportionate share) are presented below as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	March 31, 2017		December 31, 2016
Total real estate, net	$	1,400,046	$	1,413,983
Cash and cash equivalents	35		66
Note receivable from the General Partner	126,500		126,500
Other assets	4,498		4,843
Total assets	$	1,531,079	$	1,545,392
Secured debt, net	442,172		443,607
Other liabilities	23,976		27,571
Total liabilities	466,148		471,178
Total capital	1,064,931		1,074,214
Total liabilities and capital	$	1,531,079	$	1,545,392

Combined summary financial information relating to all of the DownREIT Partnership (not just our proportionate share) is presented below for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

	Three Months Ended
	March 31,
	2017			2016
Rental income	$	33,298		$	31,617
Property operating expenses	(13,976		)	(14,269		)
Real estate depreciation and amortization	(20,608		)	(30,053		)
Operating income/(loss)	(1,286		)	(12,705		)
Interest expense	(3,860		)	(3,741		)
Interest income on note receivable from the General Partner	1,166			1,180
Net income/(loss)	$	(3,980	)	$	(15,266	)

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UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

5. DEBT, NET

Our secured debt instruments generally feature either monthly interest and principal or monthly interest-only payments with balloon payments due at maturity. For purposes of classification in the following table, variable rate debt with a derivative financial instrument designated as a cash flow hedge is deemed as fixed rate debt due to the Operating Partnership having effectively established the fixed interest rate for the underlying debt instrument. Secured debt consists of the following as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	Principal Outstanding						For the Three Months Ended March 31, 2017
	March 31, 2017			December 31, 2016			Weighted Average Interest Rate		Weighted Average Years to Maturity	Number of Communities Encumbered
Fixed Rate Debt
Fannie Mae credit facilities	$	228,870		$	244,912		5.07	%	2.6	6
Deferred financing costs	(718		)	(1,070		)
Total fixed rate secured debt, net	228,152			243,842			5.07	%	2.6	6
Variable Rate Debt
Tax-exempt secured note payable	27,000			27,000			1.39	%	15.0	1
Fannie Mae credit facilities	81,339			163,637			2.34	%	1.7	2
Deferred financing costs	(251		)	(505		)
Total variable rate secured debt, net	108,088			190,132			2.10	%	5.0	3
Total Secured Debt, net	$	336,240		$	433,974		4.26	%	3.4	9

As of March 31, 2017, an aggregate commitment of $310.2 million of the General Partner's secured credit facilities with Fannie Mae was owed by the Operating Partnership based on the ownership of the assets securing the debt. The entire commitment was outstanding at March 31, 2017. The portions of the Fannie Mae credit facilities owed by the Operating Partnership mature at various dates from December 2018 through July 2020 and bear interest at floating and fixed rates. At March 31, 2017, $228.9 million of the outstanding balance was fixed and had a weighted average interest rate of 5.07% and the remaining balance of $81.3 million on these facilities had a weighted average variable interest rate of 2.34%.

The following information relates to the credit facilities owed by the Operating Partnership (dollars in thousands):

	March 31, 2017			December 31, 2016
Borrowings outstanding	$	310,209		$	408,549
Weighted average borrowings during the period ended	375,770			414,759
Maximum daily borrowings during the period ended	408,549			421,001
Weighted average interest rate during the period ended	4.1		%	3.9		%
Interest rate at the end of the period	4.4		%	4.0		%

The Operating Partnership may from time to time acquire properties subject to fixed rate debt instruments. In those situations, management will record the secured debt at its estimated fair value and amortize any difference between the fair value and par to interest expense over the life of the underlying debt instrument. The Operating Partnership did not have any unamortized fair value adjustments associated with the fixed rate debt instruments on the Operating Partnership’s properties.

Fixed Rate Debt

At March 31, 2017, the General Partner had borrowings against its fixed rate facilities of $355.8 million, of which $228.9 million was owed by the Operating Partnership based on the ownership of the assets securing the debt. As of March 31, 2017, the fixed rate Fannie Mae credit facilities owed by the Operating Partnership had a weighted average fixed interest rate of 5.07%.

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UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

Variable Rate Debt

Tax-exempt secured note payable. The variable rate mortgage note payable that secures tax-exempt housing bond issues matures March 2032. Interest on this note is payable in monthly installments. The mortgage note payable has an interest rate of 1.39% as of March 31, 2017.

Secured credit facilities. At March 31, 2017, the General Partner had borrowings against its variable rate facilities of $182.6 million, of which $81.3 million was owed by the Operating Partnership based on the ownership of the assets securing the debt. As of March 31, 2017, the variable rate borrowings under the Fannie Mae credit facilities owed by the Operating Partnership had a weighted average floating interest rate of 2.34%.

The aggregate maturities of the Operating Partnership’s secured debt due during each of the next ten calendar years subsequent to March 31, 2017 are as follows (dollars in thousands):

	Fixed			Variable
Year	Secured Credit Facilities			Tax-Exempt Secured Notes Payable			Secured Credit Facilities			Total
2017	$	—		$	—		$	—		$	—
2018	41,854			—			81,339			123,193
2019	133,204			—			—			133,204
2020	53,812			—			—			53,812
2021	—			—			—			—
2022	—			—			—			—
2023	—			—			—			—
2024	—			—			—			—
2025	—			—			—			—
2026	—			—			—			—
Thereafter	—			27,000			—			27,000
Subtotal	228,870			27,000			81,339			337,209
Non-cash (a)	(718		)	(84		)	(167		)	(969		)
Total	$	228,152		$	26,916		$	81,172		$	336,240

(a) Includes the unamortized balance of fair market value adjustments, premiums/discounts, deferred hedge gains, and deferred financing costs. For the three months endedMarch 31, 2017 and 2016, the Operating Partnership amortized $0.1 million and $0.2 million, respectively, of deferred financing costs into Interest expense.

Guarantor on Unsecured Debt

The Operating Partnership is a guarantor on the General Partner’s unsecured revolving credit facility with an aggregate borrowing capacity of $1.1 billion and unsecured commercial paper program with an aggregate borrowing capacity of $500 million, $300 million of medium-term notes due June 2018, $300 million of medium-term notes due October 2020, a $350 million term loan facility due January 2021, $400 million of medium-term notes due January 2022, $300 million of medium-term notes due July 2024, $300 million of medium-term notes due October 2025 and $300 million of medium-term notes due September 2026. As of March 31, 2017 and December 31, 2016, the General Partner did not have an outstanding balance under the unsecured revolving credit facility and had $220.0 million and $0, respectively, of notes outstanding under its unsecured commercial paper program.

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UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

6. RELATED PARTY TRANSACTIONS

Advances (To)/From the General Partner

The Operating Partnership participates in the General Partner’s central cash management program, wherein all the Operating Partnership’s cash receipts are remitted to the General Partner and all cash disbursements are funded by the General Partner. In addition, other miscellaneous costs such as administrative expenses are incurred by the General Partner on behalf of the Operating Partnership. As a result of these various transactions between the Operating Partnership and the General Partner, the Operating Partnership had net Advances (to)/from the General Partner of $114.4 million and $19.7 million at March 31, 2017 and December 31, 2016, respectively, which are reflected as increases/(decreases) of capital on the Consolidated Balance Sheets.

Allocation of General and Administrative Expenses

The General Partner shares various general and administrative costs, employees and other overhead costs with the Operating Partnership including legal assistance, acquisitions analysis, marketing, human resources, IT, accounting, rent, supplies and advertising, and allocates these costs to the Operating Partnership first on the basis of direct usage when identifiable, with the remainder allocated based on the reasonably anticipated benefits to the parties. The general and administrative expenses allocated to the Operating Partnership by UDR were $4.5 million and $4.6 million during the three months endedMarch 31, 2017 and 2016, respectively, and are included in General and administrative on the Consolidated Statements of Operations. In the opinion of management, this method of allocation reflects the level of services received by the Operating Partnership from the General Partner.

During the three months endedMarch 31, 2017 and 2016, the Operating Partnership reimbursed the General Partner $3.6 million and $3.6 million, respectively, for shared services related to corporate level property management costs incurred by the General Partner. These shared costs reimbursements and related party management fees are initially recorded within the line item General and administrative on the Consolidated Statements of Operations, and a portion related to management costs is reclassified to Property management on the Consolidated Statements of Operations. (See further discussion below.)

Shared Services/Management Fee

The Operating Partnership self-manages its own properties and is party to an Inter-Company Employee and Cost Sharing Agreement with the General Partner. This agreement provides for reimbursements to the General Partner for the Operating Partnership’s allocable share of costs incurred by the General Partner for (a) shared services of corporate level property management employees and related support functions and costs, and (b) general and administrative costs. As discussed above, the reimbursement for shared services is classified in Property management on the Consolidated Statements of Operations.

Notes Payable to the General Partner

As of both March 31, 2017 and December 31, 2016, the Operating Partnership had $273.3 million of unsecured notes payable to the General Partner at annual interest rates between 4.12% and 5.34%. Certain limited partners of the Operating Partnership have provided guarantees or reimbursement agreements related to these notes payable. The guarantees were provided by the limited partners in conjunction with their contribution of properties to the Operating Partnership. The notes mature on August 31, 2021, December 31, 2023 and April 1, 2026, and interest payments are made monthly. The Operating Partnership recognized interest expense on the notes payable of $3.1 million and $3.1 million during the three months endedMarch 31, 2017 and 2016, respectively.

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UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

7. FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS

Fair value is based on the price that would be received to sell an asset or the exit price that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three-level valuation hierarchy prioritizes observable and unobservable inputs used to measure fair value. The fair value hierarchy consists of three broad levels, which are described below:

• Level 1 — Quoted prices in active markets for identical assets or liabilities that the entity has the ability to access.

• Level 2 — Observable inputs other than prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated with observable market data.

• Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.

The estimated fair values of the Operating Partnership’s financial instruments either recorded or disclosed on a recurring basis as of March 31, 2017 and December 31, 2016 are summarized as follows (dollars in thousands):

					Fair Value at March 31, 2017, Using
	Total Carrying Amount in Statement of Financial Position at March 31, 2017		Fair Value Estimate at March 31, 2017		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Description:
Secured debt instruments - fixed rate: (a)
Fannie Mae credit facilities	$	228,870	$	235,159	$	—	$	—	$	235,159
Secured debt instruments - variable rate: (a)
Tax-exempt secured notes payable	27,000		27,000		—		—		27,000
Fannie Mae credit facilities	81,339		81,339		—		—		81,339
Total liabilities	$	337,209	$	343,498	$	—	$	—	$	343,498

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UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

					Fair Value at December 31, 2016, Using
	Total Carrying Amount in Statement of Financial Position at December 31, 2016		Fair Value Estimate at December 31, 2016		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Description:
Derivatives - Interest rate contracts (b)	$	1	$	1	$	—	$	1	$	—
Total assets	$	1	$	1	$	—	$	1	$	—
Secured debt instruments - fixed rate: (a)
Fannie Mae credit facilities	$	244,912	$	251,664	$	—	$	—	$	251,664
Secured debt instruments - variable rate: (a)
Tax-exempt secured notes payable	27,000		27,000		—		—		27,000
Fannie Mae credit facilities	163,637		163,637		—		—		163,637
Total liabilities	$	435,549	$	442,301	$	—	$	—	$	442,301

(a)See Note 5, Debt, Net.

(b)See Note 8, Derivatives and Hedging Activity.

There were no transfers into or out of any of the levels of the fair value hierarchy during the three months endedMarch 31, 2017.

Financial Instruments Carried at Fair Value

The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. The fair values of interest rate options are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates rise above the strike rate of the caps. The variable interest rates used in the calculation of projected receipts on the cap are based on an expectation of future interest rates derived from observable market interest rate curves and volatilities.

The General Partner, on behalf of the Operating Partnership, incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Operating Partnership has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees.

Although the General Partner, on behalf of the Operating Partnership, has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of March 31, 2017 and December 31, 2016, the Operating Partnership has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Operating Partnership has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. In conjunction with the FASB’s fair value measurement guidance, the Operating Partnership made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.

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UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

Financial Instruments Not Carried at Fair Value

As of March 31, 2017, the fair values of cash and cash equivalents, restricted cash, accounts receivable, prepaids, real estate taxes payable, accrued interest payable, security deposits and prepaid rent, distributions payable and accounts payable approximated their carrying values because of the short term nature of these instruments. The estimated fair values of other financial instruments were determined by the Operating Partnership using available market information and appropriate valuation methodologies. Considerable judgment is necessary to interpret market data and develop estimated fair values. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Operating Partnership would realize on the disposition of the financial instruments. The use of different market assumptions or estimation methodologies may have a material effect on the estimated fair value amounts.

The General Partner estimates the fair value of our debt instruments by discounting the remaining cash flows of the debt instrument at a discount rate equal to the replacement market credit spread plus the corresponding treasury yields. Factors considered in determining a replacement market credit spread include general market conditions, borrower specific credit spreads, time remaining to maturity, loan-to-value ratios and collateral quality (Level 3).

The Operating Partnership records impairment losses on long-lived assets used in operations when events and circumstances indicate that the assets might be impaired and the undiscounted cash flows estimated to be generated by the future operation and disposition of those assets are less than the net book value of those assets. Cash flow estimates are based upon historical results adjusted to reflect management’s best estimate of future market and operating conditions and our estimated holding periods. The net book value of impaired assets is reduced to fair value. The General Partner’s estimates of fair value represent management’s estimates based upon Level 3 inputs such as industry trends and reference to market rates and transactions.

8. DERIVATIVES AND HEDGING ACTIVITY

Risk Management Objective of Using Derivatives

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

Cash Flow Hedges of Interest Rate Risk

The General Partner’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the General Partner primarily uses interest rate swaps and caps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the General Partner making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. Interest rate caps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty if interest rates rise above the strike rate on the contract in exchange for an up front premium.

A portion of the General Partner’s interest rate derivatives are owed by the Operating Partnership based on the General Partner’s underlying debt instruments owed by the Operating Partnership. (See Note 5, Debt, Net.)

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in Accumulated other comprehensive income/(loss), net in the Consolidated Balance Sheets and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During the three months endedMarch 31, 2017 and 2016, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. During the three months endedMarch 31, 2017, the Operating Partnership recognized a loss of less than $0.1 million reclassified from

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UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

Accumulated other comprehensive income/(loss), net to Interest expense due to the de-designation of a cash flow hedge and recorded no other ineffectiveness to earnings. During the three months endedMarch 31, 2016, the Operating Partnership recorded no gain or loss from ineffectiveness.

Amounts reported in Accumulated other comprehensive income/(loss), net related to derivatives will be reclassified to interest expense as interest payments are made on the General Partner’s variable-rate debt that is owed by the Operating Partnership. Through March 31,2018, we estimate that less than $0.1 million will be reclassified as an increase to interest expense.

As of March 31, 2017, the Operating Partnership had the following outstanding interest rate derivatives designated as cash flow hedges of interest rate risk (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate caps	1	$	82,494

Derivatives not designated as hedges are not speculative and are used to manage the Operating Partnership’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in an adjustment to earnings of less than $0.1 million for the three months endedMarch 31, 2017 and 2016.

As of March 31, 2017, we had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate caps	3	$	87,580

Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets

The table below presents the fair value of the Operating Partnership’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	Asset Derivatives (included in Other assets)				Liability Derivatives (included in Other liabilities)
	Fair Value at:				Fair Value at:
	March 31, 2017		December 31, 2016		March 31, 2017		December 31, 2016
Derivatives designated as hedging instruments:
Interest rate products	$	—	$	—	$	—	$	—
Derivatives not designated as hedging instruments:
Interest rate products	$	—	$	1	$	—	$	—

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UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

Tabular Disclosure of the Effect of Derivative Instruments on the Consolidated Statements of Operations

The tables below present the effect of the derivative financial instruments on the Consolidated Statements of Operations for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

	Unrealized holding gain/(loss) Recognized in OCI (Effective Portion)					Gain/(Loss) Reclassified from Accumulated OCI into Interest expense (Effective Portion)					Gain/(Loss) Recognized in Interest expense (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Derivatives in Cash Flow Hedging Relationships	2017		2016			2017		2016			2017			2016
Three Months Ended March 31,
Interest rate products	$	—	$	(2	)	$	—	$	(1	)	$	(54	)	$	—

	Gain/(Loss) Recognized in Interest income and other income/(expense), net
Derivatives Not Designated as Hedging Instruments	2017			2016
Three Months Ended March 31,
Interest rate products	$	(1	)	$	—

Credit-risk-related Contingent Features

The General Partner has agreements with some of its derivative counterparties that contain a provision where (1) if the General Partner defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the General Partner could also be declared in default on its derivative obligations; or (2) the General Partner could be declared in default on its derivative obligations if repayment of the underlying indebtedness is accelerated by the lender due to the General Partner’s default on the indebtedness.

Certain of the General Partner’s agreements with its derivative counterparties contain provisions where if there is a change in the General Partner’s financial condition that materially changes the General Partner’s creditworthiness in an adverse manner, the General Partner may be required to fully collateralize its obligations under the derivative instrument. At March 31, 2017 and December 31, 2016, no cash collateral was posted or required to be posted by the General Partner or by a counterparty.

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

The General Partner has certain agreements with some of its derivative counterparties that contain a provision where in the event of default by the General Partner or the counterparty, the right of setoff may be exercised. Any amount payable to one party by the other party may be reduced by its setoff against any amounts payable by the other party. Events that give rise to default by either party may include, but are not limited to, the failure to pay or deliver payment under the derivative agreement, the failure to comply with or perform under the derivative agreement, bankruptcy, a merger without assumption of the derivative agreement, or in a merger, a surviving entity’s creditworthiness is materially weaker than the original party to the derivative agreement.

As of March 31, 2017, the fair value of derivatives in a net liability position that were owed by the Operating Partnership, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was zero.

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UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

The General Partner has elected not to offset derivative positions in the consolidated financial statements. The table below presents the effect on the Operating Partnership’s financial position had the General Partner made the election to offset its derivative positions as of March 31, 2017 and December 31, 2016:

Offsetting of Derivative Assets
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Financial Instruments		Cash Collateral Received		Net Amount
March 31, 2017	$	—	$	—	$	—	$	—	$	—	$	—
December 31, 2016	$	1	$	—	$	1	$	—	$	—	$	1

(a) Amounts reconcile to the aggregate fair value of derivative assets in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

Offsetting of Derivative Liabilities

Gross Amounts of Recognized Liabilities

Gross Amounts Offset in the Consolidated Balance Sheets

Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (a)

Gross Amounts Not Offset in the Consolidated Balance Sheets

Financial Instruments

Cash Collateral Posted

Net Amount

March 31, 2017

$

—

$

—

$

—

$

—

$

—

$

—

December 31, 2016

$

—

$

—

$

—

$

—

$

—

$

—

(a) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

9. CAPITAL STRUCTURE

General Partnership Units

The General Partner has complete discretion to manage and control the operations and business of the Operating Partnership, which includes but is not limited to the acquisition and disposition of real property, construction of buildings and making capital improvements, and the borrowing of funds from outside lenders or UDR and its subsidiaries to finance such activities. The General Partner can generally authorize, issue, sell, redeem or purchase any OP Unit or securities of the Operating Partnership without the approval of the limited partners. The General Partner can also approve, with regard to the issuances of OP Units, the class or one or more series of classes, with designations, preferences, participating, optional or other special rights, powers and duties including rights, powers and duties senior to limited partnership interests without approval of any limited partners except holders of Class A Limited Partnership Units. There were 110,883 General Partnership units outstanding at March 31, 2017 and December 31, 2016, all of which were held by UDR.

Limited Partnership Units

As of March 31, 2017 and December 31, 2016, there were 183,240,041 and 183,167,815, respectively, of limited partnership units outstanding, of which 1,873,332 were Class A Limited Partnership Units. UDR owned 174,122,808, or 95.0%, and 174,119,201, or 95.1%, of OP Units outstanding at March 31, 2017 and December 31, 2016, respectively, of which 121,661 were Class A Limited Partnership Units. The remaining 9,117,233, or 5.0%, and 9,048,614, or 4.9%, of OP Units outstanding were held by non-affiliated partners at March 31, 2017 and December 31, 2016, respectively, of which 1,751,671 were Class A Limited Partnership Units.

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UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

Subject to the terms of the Operating Partnership Agreement, the limited partners have the right to require the Operating Partnership to redeem all or a portion of the OP Units held by the limited partner at a redemption price equal to and in the form of the Cash Amount (as defined in the Operating Partnership Agreement), provided that such OP Units have been outstanding for at least one year. UDR, as general partner of the Operating Partnership, may, in its sole discretion, purchase the OP Units by paying to the limited partner either the Cash Amount or the REIT Share Amount (generally one share of common stock of UDR for each OP Unit), as defined in the Operating Partnership Agreement.

The non-affiliated limited partners’ capital is adjusted to redemption value at the end of each reporting period with the corresponding offset against UDR’s limited partner capital account based on the redemption rights noted above. The aggregate value upon redemption of the then-outstanding OP Units held by limited partners was $330.6 million and $330.1 million as of March 31, 2017 and December 31, 2016, respectively, based on the value of UDR’s common stock at each period end. A limited partner has no right to receive any distributions from the Operating Partnership on or after the date of redemption of its OP Units.

Class A Limited Partnership Units

Class A Limited Partnership Units have a cumulative, annual, non-compounded preferred return, which is equal to 8% based on a value of $16.61 per Class A Limited Partnership Unit.

Holders of the Class A Limited Partnership Units exclusively possess certain voting rights. The Operating Partnership may not do the following without approval of the holders of the Class A Limited Partnership Units: (i) increase the authorized or issued amount of Class A Limited Partnership Units, (ii) reclassify any other partnership interest into Class A Limited Partnership Units, (iii) create, authorize or issue any obligations or security convertible into or the right to purchase Class A Limited Partnership Units, (iv) enter into a merger or acquisition, or (v) amend or modify the Operating Partnership Agreement in a manner that adversely affects the relative rights, preferences or privileges of the Class A Limited Partnership Units.

The following table shows OP Units outstanding and OP Unit activity as of and for the three months ended March 31, 2017:

	Class A Limited Partners			UDR, Inc.
		Limited Partners		Limited Partner	Class A Limited Partner	General Partner	Total
Ending balance at December 31, 2016	1,751,671	7,296,943		173,997,540	121,661	110,883	183,278,698
Vesting of LTIP Units	—	72,226		—		—	72,226
OP redemptions for UDR stock	—	(3,607	)	3,607	—	—	—
Ending balance at March 31, 2017	1,751,671	7,365,562		174,001,147	121,661	110,883	183,350,924

LTIP Units

UDR grants long-term incentive plan units ("LTIP Units") to certain employees and non-employee directors. The LTIP Units represent an ownership interest in the Operating Partnership and have voting and distribution rights consistent with OP Units. The LTIP Units are subject to the terms of UDR's long-term incentive plan.

Two classes of LTIP Units are granted, Class 1 LTIP Units and Class 2 LTIP Units. Class 1 LTIP Units are granted to non-employee directors and vest after one year. Class 2 LTIP Units are granted to certain employees and vest over a period from one to three years subject to certain performance and market conditions being achieved. Vested LTIP Units may be converted into OP Units provided that such LTIP Units have been outstanding for at least two years from the date of grant.

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UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

Allocation of Profits and Losses

Profit of the Operating Partnership is allocated in the following order: (i) to the General Partner and the Limited Partners in proportion to and up to the amount of cash distributions made during the year, and (ii) to the General Partner and Limited Partners in accordance with their percentage interests. Losses and depreciation and amortization expenses, non-recourse liabilities are allocated to the General Partner and Limited Partners in accordance with their percentage interests. Losses allocated to the Limited Partners are capped to the extent that such an allocation would not cause a deficit in the Limited Partners’ capital account. Such losses are, therefore, allocated to the General Partner. If any Partner’s capital balance were to fall into a deficit, any income and gains are allocated to each Partner sufficient to eliminate its negative capital balance.

10. COMMITMENTS AND CONTINGENCIES

Contingencies

Litigation and Legal Matters

The Operating Partnership is subject to various legal proceedings and claims arising in the ordinary course of business. The Operating Partnership cannot determine the ultimate liability with respect to such legal proceedings and claims at this time. The General Partner believes that such liability, to the extent not provided for through insurance or otherwise, will not have a material adverse effect on the Operating Partnership’s financial condition, results of operations or cash flow.

11. REPORTABLE SEGMENTS

GAAP guidance requires that segment disclosures present the measure(s) used by the chief operating decision maker to decide how to allocate resources and for purposes of assessing such segments’ performance. The Operating Partnership has the same chief operating decision maker as that of its parent, the General Partner. The chief operating decision maker consists of several members of UDR’s executive management team who use several generally accepted industry financial measures to assess the performance of the business for our reportable operating segments.

The Operating Partnership owns and operates multifamily apartment communities throughout the United States that generate rental and other property related income through the leasing of apartment homes to a diverse base of tenants. The primary financial measures of the Operating Partnership’s apartment communities are rental income and net operating income ("NOI"), and are included in the chief operating decision maker’s assessment of the Operating Partnership’s performance on a consolidated basis. Rental income represents gross market rent less adjustments for concessions, vacancy loss and bad debt. NOI is defined as total revenues less direct property operating expenses. Rental expenses include real estate taxes, insurance, personnel, utilities, repairs and maintenance, administrative and marketing. Excluded from NOI are property management costs, which are the Operating Partnership’s allocable share of costs incurred by the General Partner for shared services of corporate level property management employees and related support functions and costs. The chief operating decision maker of the General Partner utilizes NOI as the key measure of segment profit or loss.

The Operating Partnership’s two reportable segments are Same-Store Communities and Non-Mature Communities/Other:

• Same-Store Communities represent those communities acquired, developed, and stabilized prior to January 1, 2016 and held as of March 31, 2017. A comparison of operating results from the prior year is meaningful as these communities were owned and had stabilized occupancy and operating expenses as of the beginning of the prior period, there is no plan to conduct substantial redevelopment activities, and the community is not held for disposition within the current year. A community is considered to have stabilized occupancy once it achieves 90% occupancy for at least 3 consecutive months.

• Non-Mature Communities/Other represent those communities that do not meet the criteria to be included in Same-Store Communities, including, but not limited to, recently acquired, developed and redeveloped communities, and the non-apartment components of mixed use properties.

Management of the General Partner evaluates the performance of each of the Operating Partnership’s apartment communities on a Same-Store Community and Non-Mature Community/Other basis, as well as individually and geographically. This is consistent with the aggregation criteria under GAAP as each of our apartment communities generally has similar

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UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

economic characteristics, facilities, services, and tenants. Therefore, the Operating Partnership’s reportable segments have been aggregated by geography in a manner identical to that which is provided to the chief operating decision maker.

All revenues are from external customers and no single tenant or related group of tenants contributed 10% or more of the Operating Partnership’s total revenues during the three months endedMarch 31, 2017 and 2016.

The following table details rental income and NOI for the Operating Partnership’s reportable segments for the three months endedMarch 31, 2017 and 2016, and reconciles NOI to Net income/(loss) attributable to OP unitholders in the Consolidated Statements of Operations (dollars in thousands):

	Three Months Ended
	March 31, (a)
	2017			2016
Reportable apartment home segment rental income
Same-Store Communities
West Region	$	50,482		$	47,636
Mid-Atlantic Region	14,748			14,167
Northeast Region	13,559			13,006
Southeast Region	12,271			11,696
Non-Mature Communities/Other	11,545			12,281
Total segment and consolidated rental income	$	102,605		$	98,786
Reportable apartment home segment NOI
Same-Store Communities
West Region	$	38,445		$	36,159
Mid-Atlantic Region	10,095			9,362
Northeast Region	10,131			10,057
Southeast Region	8,283			8,043
Non-Mature Communities/Other	8,109			8,931
Total segment and consolidated NOI	75,063			72,552
Reconciling items:
Property management	(2,822		)	(2,717		)
Other operating expenses	(1,548		)	(1,500		)
Real estate depreciation and amortization	(36,879		)	(36,791		)
General and administrative	(5,219		)	(5,421		)
Casualty-related recoveries/(charges), net	(553		)	—
Income/(loss) from unconsolidated entities	(5,424		)	(13,387		)
Interest expense	(8,611		)	(7,605		)
Net (income)/loss attributable to noncontrolling interests	(350		)	(344		)
Net income/(loss) attributable to OP unitholders	$	13,657		$	4,787

(a)Same-Store Community population consisted of 15,058 apartment homes.

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UNITED DOMINION REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (continued)

MARCH 31, 2017

The following table details the assets of the Operating Partnership’s reportable segments as of March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Reportable apartment home segment assets
Same-Store Communities
West Region	$	1,601,136		$	1,596,815
Mid-Atlantic Region	656,850			655,693
Northeast Region	675,407			674,928
Southeast Region	330,214			328,729
Non-Mature Communities/Other	422,727			418,539
Total segment assets	3,686,334			3,674,704
Accumulated depreciation	(1,445,528		)	(1,408,815		)
Total segment assets - net book value	2,240,806			2,265,889
Reconciling items:
Cash and cash equivalents	864			756
Restricted cash	12,141			11,694
Investment in unconsolidated entities	103,267			112,867
Other assets	21,475			24,329
Total consolidated assets	$	2,378,553		$	2,415,535

Capital expenditures related to the Operating Partnership’s Same-Store Communities totaled $8.0 million and $5.3 million for the three months endedMarch 31, 2017 and 2016, respectively. Capital expenditures related to the Operating Partnership’s Non-Mature Communities/Other totaled $0.4 million and $0.3 million for the three months endedMarch 31, 2017 and 2016, respectively.

Markets included in the above geographic segments are as follows:

i. West Region — San Francisco, Orange County, Seattle, Los Angeles, Monterey Peninsula, Other Southern California and Portland

ii. Mid-Atlantic Region — Metropolitan, D.C. and Baltimore

iii. Northeast Region — New York and Boston

iv. Southeast Region — Tampa, Nashville and Other Florida

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

Forward-Looking Statements

This Report contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Such forward-looking statements include, without limitation, statements concerning property acquisitions and dispositions, development activity and capital expenditures, capital raising activities, rent growth, occupancy, and rental expense growth. Words such as “expects,” “anticipates,” “intends,” “plans,” “likely,” “will,” “believes,” “seeks,” “estimates,” and variations of such words and similar expressions are intended to identify such forward-looking statements. Such statements involve known and unknown risks, uncertainties and other factors which may cause our actual results, performance or achievements to be materially different from the results of operations or plans expressed or implied by such forward-looking statements. Such factors include, among other things, unfavorable changes in the apartment market, changing economic conditions, the impact of inflation/deflation on rental rates and property operating expenses, expectations concerning availability of capital and the stabilization of the capital markets, the impact of competition and competitive pricing, acquisitions, developments and redevelopments not achieving anticipated results, delays in completing developments, redevelopments and lease-ups on schedule, expectations on job growth, home affordability and demand/supply ratio for multifamily housing, expectations concerning development and redevelopment activities, expectations on occupancy levels, expectations concerning the joint ventures with third parties, expectations that automation will help grow net operating income, and expectations on annualized net operating income.

The following factors, among others, could cause our future results to differ materially from those expressed in the forward-looking statements:

•general economic conditions;

• unfavorable changes in apartment market and economic conditions that could adversely affect occupancy levels and rental rates;

•the failure of acquisitions to achieve anticipated results;

•possible difficulty in selling apartment communities;

•competitive factors that may limit our ability to lease apartment homes or increase or maintain rents;

•insufficient cash flow that could affect our debt financing and create refinancing risk;

• failure to generate sufficient revenue, which could impair our debt service payments and distributions to stockholders;

•development and construction risks that may impact our profitability;

• potential damage from natural disasters, including hurricanes and other weather-related events, which could result in substantial costs to us;

• risks from extraordinary losses for which we may not have insurance or adequate reserves;

• uninsured losses due to insurance deductibles, self-insurance retention, uninsured claims or casualties, or losses in excess of applicable coverage;

• delays in completing developments and lease-ups on schedule;

• our failure to succeed in new markets;

• changing interest rates, which could increase interest costs and affect the market price of our securities;

59

•potential liability for environmental contamination, which could result in substantial costs to us;

•the imposition of federal taxes if we fail to qualify as a REIT under the Code in any taxable year;

• our internal control over financial reporting may not be considered effective which could result in a loss of investor confidence in our financial reports, and in turn have an adverse effect on our stock price; and

•changes in real estate laws, tax laws and other laws affecting our business.

A discussion of these and other factors affecting our business and prospects is set forth in Part II, Item 1A. Risk Factors. We encourage investors to review these risk factors.

Although we believe that the assumptions underlying the forward-looking statements contained herein are reasonable, any of the assumptions could be inaccurate, and therefore such statements included in this Report may not prove to be accurate. In light of the significant uncertainties inherent in the forward-looking statements included herein, the inclusion of such information should not be regarded as a representation by us or any other person that the results or conditions described in such statements or our objectives and plans will be achieved.

Forward-looking statements and such risks, uncertainties and other factors speak only as of the date of this Report, and we expressly disclaim any obligation or undertaking to update or revise any forward-looking statement contained herein, to reflect any change in our expectations with regard thereto, or any other change in events, conditions or circumstances on which any such statement is based, except to the extent otherwise required by law.

UDR, Inc.:

Business Overview

We are a self-administered real estate investment trust, or REIT, that owns, operates, acquires, renovates, develops, redevelops, disposes of, and manages multifamily apartment communities. We were formed in 1972 as a Virginia corporation. In June 2003, we changed our state of incorporation from Virginia to Maryland. Our subsidiaries include the Operating Partnership and the DownREIT Partnership. Unless the context otherwise requires, all references in this Report to “we,” “us,” “our,” “the Company,” or “UDR” refer collectively to UDR, Inc., its subsidiaries and its consolidated joint ventures.

At March 31, 2017, our consolidated real estate portfolio included 128 communities in 10 states plus the District of Columbia totaling 39,698 apartment homes, and our total real estate portfolio, inclusive of our unconsolidated communities, included an additional 28 communities with 7,131 apartment homes. The Same-Store Community apartment home population for the three months endedMarch 31, 2017 was 35,689.

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The following table summarizes our market information by major geographic markets as of and for the three months endedMarch 31, 2017.

								Three Months Ended
		March 31, 2017						March 31, 2017
	Number of Apartment Communities	Number of Apartment Homes	Percentage of Total Carrying Value		Total Carrying Value (in thousands)			Average Physical Occupancy		Monthly Income per Occupied Home (a)
Same-Store Communities
West Region
San Francisco, CA	10	2,558	7.4	%	$	725,142		97.1	%	$	3,374
Orange County, CA	11	3,367	9.0	%	877,788			95.7	%	2,321
Seattle, WA	10	2,014	5.6	%	552,143			96.8	%	2,071
Los Angeles, CA	4	1,225	4.6	%	447,283			95.7	%	2,673
Monterey Peninsula, CA	7	1,565	1.7	%	169,221			96.5	%	1,580
Other Southern California	3	756	1.3	%	125,156			95.1	%	1,789
Portland, OR	2	476	0.5	%	47,704			96.7	%	1,529
Mid-Atlantic Region
Metropolitan D.C.	21	7,551	19.7	%	1,927,842			97.0	%	1,981
Richmond, VA	4	1,358	1.5	%	144,103			97.4	%	1,276
Baltimore, MD	3	720	1.5	%	149,367			96.0	%	1,697
Northeast Region
New York, NY	4	1,945	13.3	%	1,300,310			98.0	%	4,338
Boston, MA	5	1,548	5.7	%	558,122			96.1	%	2,939
Southeast Region
Orlando, FL	9	2,500	2.2	%	217,456			96.8	%	1,231
Tampa, FL	7	2,287	2.5	%	246,274			96.7	%	1,326
Nashville, TN	8	2,260	2.1	%	202,822			97.1	%	1,241
Other Florida	1	636	0.9	%	83,595			96.6	%	1,494
Southwest Region
Dallas, TX	6	2,040	2.0	%	195,053			97.4	%	1,202
Austin, TX	3	883	0.9	%	88,926			97.2	%	1,364
Total/Average Same-Store Communities	118	35,689	82.4	%	8,058,307			96.8	%	$	2,043
Non-Mature, Commercial Properties & Other	10	4,009	13.6	%	1,335,425
Total Real Estate Held for Investment	128	39,698	96.0	%	9,393,732
Real Estate Under Development (b)	—	—	4.0	%	393,837
Total Real Estate Owned	128	39,698	100.0	%	9,787,569
Total Accumulated Depreciation					(3,026,660		)
Total Real Estate Owned, Net of Accumulated Depreciation					$	6,760,909

(a) Monthly Income per Occupied Home represents total monthly revenues divided by the average physical number of occupied apartment homes in our Same-Store portfolio.

(b) As of March 31, 2017, the Company was developing two wholly-owned communities with 1,101 apartment homes, none of which have been completed.

We report in two segments: Same-Store Communities and Non-Mature Communities/Other.

Our Same-Store Communities segment represents those communities acquired, developed, and stabilized prior to January 1, 2016 and held as of March 31, 2017. These communities were owned and had stabilized occupancy and operating expenses as of the beginning of the prior period, there is no plan to conduct substantial redevelopment activities, and the communities are not classified as held for disposition within the current year. A community is considered to have stabilized occupancy once it achieves 90% occupancy for at least three consecutive months.

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Our Non-Mature Communities/Other segment represents those communities that do not meet the criteria to be included in Same-Store Communities, including, but not limited to, recently acquired, developed and redeveloped communities, and the non-apartment components of mixed use properties.

Liquidity and Capital Resources

Liquidity is the ability to meet present and future financial obligations either through operating cash flows, sales of properties, borrowings under our credit agreements, and/or the issuance of debt and/or equity securities. Our primary source of liquidity is our cash flow from operations as determined by rental rates, occupancy levels, and operating expenses related to our portfolio of apartment homes and borrowings under our credit agreements. We routinely use our unsecured revolving credit facility to temporarily fund certain investing and financing activities prior to arranging for longer-term financing or the issuance of equity or debt securities. During the past several years, proceeds from the sale of real estate have been used for both investing and financing activities as we repositioned our portfolio.

We expect to meet our short-term liquidity requirements generally through net cash provided by property operations and borrowings under our credit agreements and our unsecured commercial paper program. We expect to meet certain long-term liquidity requirements such as scheduled debt maturities, the repayment of financing on development activities, and potential property acquisitions, through secured and unsecured borrowings, the issuance of debt or equity securities, and/or the disposition of properties. We believe that our net cash provided by property operations and borrowings under our credit agreements and our unsecured commercial paper program will continue to be adequate to meet both operating requirements and the payment of dividends by the Company in accordance with REIT requirements. Likewise, the budgeted expenditures for improvements and renovations of certain properties are expected to be funded from property operations, borrowings under credit agreements, the issuance of debt or equity securities, and/or dispositions of properties.

We have a shelf registration statement filed with the Securities and Exchange Commission, or “SEC,” which provides for the issuance of common stock, preferred stock, depositary shares, debt securities, guarantees of debt securities, warrants, subscription rights, purchase contracts and units to facilitate future financing activities in the public capital markets. Access to capital markets is dependent on market conditions at the time of issuance.

In April 2012, the Company entered into an equity distribution agreement, which was amended in July 2014, under which the Company may offer and sell up to 20 million shares of its common stock, from time to time, to or through its sales agents. During the three months ended March 31, 2017, the Company did not sell any shares of common stock through this program. As of March 31, 2017, we had 13.1 million shares of common stock available for future issuance under the April 2012 program.

On January 23, 2017, the Company entered into an unsecured commercial paper program. Under the terms of the program, the Company may issue unsecured commercial paper up to a maximum aggregate amount outstanding of $500 million. The notes are sold under customary terms in the United States commercial paper market and rank pari passu with all of the Company’s other unsecured indebtedness. The notes are fully and unconditionally guaranteed by the Operating Partnership. As of March 31, 2017, we had issued $220.0 million of unsecured commercial paper, for one month terms, at a weighted average annualized rate of 1.24%.

Future Capital Needs

Future development and redevelopment expenditures may be funded through unsecured or secured credit facilities, proceeds from the issuance of equity or debt securities, sales of properties, joint ventures, and, to a lesser extent, from cash flows provided by property operations. Acquisition activity in strategic markets may be funded through joint ventures, by the reinvestment of proceeds from the sale of properties, through the issuance of equity or debt securities, the issuance of operating partnership units and the assumption or placement of secured and/or unsecured debt.

During the remainder of 2017, we have approximately $49.9 million of secured debt maturing, inclusive of principal amortization, and $220.0 million of unsecured debt maturing, comprised solely of unsecured commercial paper. We anticipate repaying that debt with cash flow from our operations, proceeds from debt or equity offerings, proceeds from dispositions of properties, or from borrowings under our credit agreements and our unsecured commercial paper program.

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Critical Accounting Policies and Estimates and New Accounting Pronouncements

Our critical accounting policies are those having the most impact on the reporting of our financial condition and results and those requiring significant judgments and estimates. These policies include those related to (1) capital expenditures, (2) impairment of long-lived assets, (3) real estate investment properties, and (4) revenue recognition.

Our critical accounting policies are described in more detail in the section entitled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in UDR’s Annual Report on Form 10-K, filed with the SEC on February 21, 2017. There have been no significant changes in our critical accounting policies from those reported in our Form 10-K filed with the SEC on February 21, 2017. With respect to these critical accounting policies, we believe that the application of judgments and assessments is consistently applied and produces financial information that fairly depicts the results of operations for all periods presented.

Statements of Cash Flows

The following discussion explains the changes in Net cash provided by/(used in) operating activities, Net cash provided by/(used in) investing activities, and Net cash provided by/(used in) financing activities that are presented in our Consolidated Statements of Cash Flows for the three months endedMarch 31, 2017 and 2016.

We elected to early adopt Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") ASU 2016-15, Statement of Cash Flows (Topic 230), Classification of Certain Cash Receipts and Cash Payments in 2016. See Note 2, Significant Accounting Policies, in the Notes to the UDR, Inc. Consolidated Financial Statements included in this Report for a complete description of the ASU and its impact.

Upon adopting the ASU, we elected to classify distributions received from equity method investees using the cumulative earnings approach. As a result, the following retrospective changes were made (in thousands):

	Three Months Ended
	March 31, 2016
Net cash provided by/(used in) operating activities - as previously presented	$	112,489
Return on investment in unconsolidated joint ventures	272
Net cash provided by/(used in) operating activities - as reported herein	$	112,761
Net cash provided by/(used in) investing activities - as previously presented	$	(44,954	)
Return on investment in unconsolidated joint ventures	(272		)
Net cash provided by/(used in) investing activities - as reported herein	$	(45,226	)

Operating Activities

For the three months endedMarch 31, 2017, our Net cash provided by/(used in) operating activities was $120.5 million compared to $112.8 million for the comparable period in 2016. The increase in cash flow from operating activities was primarily due to improved net operating income, primarily driven by revenue growth at communities and changes in operating assets and liabilities.

Investing Activities

For the three months endedMarch 31, 2017, Net cash provided by/(used in) investing activities was $(162.8) million compared to $(45.2) million for the comparable period in 2016. The increase in cash used in investing activities was primarily due to the acquisition of real estate assets, increased development of real estate assets, a decrease in proceeds from the sale of real estate assets and increased cash used for investments in unconsolidated joint ventures.

Acquisitions

During the three months endedMarch 31, 2017, the Company exercised its fixed-price option to purchase its joint venture partner's ownership interest in a 244 home operating community in Seattle, Washington, thereby increasing its ownership interest from 49% to 100%, for a cash purchase price of approximately $66.0 million. As a result, the Company consolidated the operating community. The Company had previously accounted for its 49% ownership interest as a preferred equity investment in an unconsolidated joint venture. As a result of the consolidation, the Company increased its real estate owned by approximately $97.0 million, recorded approximately $1.7 million of in-place lease intangibles and recorded a gain on consolidation of $12.2 million, which is included in Income/(loss) from unconsolidated entities on the Consolidated Statements of Operations.

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Dispositions

During the three months endedMarch 31, 2017, the Company sold a parcel of land in Richmond, Virginia for gross proceeds of $3.5 million, resulting in net proceeds of $3.3 million and a gain of $2.1 million.

Capital Expenditures

We capitalize those expenditures that materially enhance the value of an existing asset or substantially extend the useful life of an existing asset. Expenditures necessary to maintain an existing property in ordinary operating condition are expensed as incurred.

For the three months endedMarch 31, 2017, total capital expenditures of $18.4 million, or $464 per stabilized home, which in aggregate include recurring capital expenditures and major renovations, were spent across our portfolio, excluding development and commercial properties, as compared to $19.7 million, or $484 per stabilized home, for the comparable period in 2016.

The decrease in total capital expenditures was primarily due to:

• a decrease of 52.6% or $2.9 million in major renovations, primarily due to lower redevelopment spend.

This decrease was partially offset by:

• an increase of 25.3% or $1.8 million in revenue-enhancing improvements, such as kitchen and bath remodels and upgrades to common areas.

The following table outlines capital expenditures and repair and maintenance costs for all of our communities, excluding real estate under development and commercial properties, for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

							Per Home
	Three Months Ended March 31,						Three Months Ended March 31,
	2017		2016		% Change		2017		2016		% Change
Turnover capital expenditures	$	2,121	$	2,462	(13.9	)%	$	53	$	60	(11.7	)%
Asset preservation expenditures	4,670		4,499		3.8	%	118		110		7.3	%
Total recurring capital expenditures	6,791		6,961		(2.4	)%	171		171		—	%
Revenue enhancing improvements	8,982		7,171		25.3	%	226		176		28.4	%
Major renovations (a)	2,638		5,570		(52.6	)%	67		137		(51.1	)%
Total capital expenditures	$	18,411	$	19,702	(6.6	)%	$	464	$	484	(4.1	)%
Repair and maintenance expense	$	7,803	$	8,121	(3.9	)%	$	197	$	199	(1.0	)%
Average number of homes (b)	39,698		40,728		(2.5	)%

(a) Major renovations include major structural changes and/or architectural revisions to existing buildings.

(b) Average number of homes is calculated based on the number of homes outstanding at the end of each month.

The above table includes amounts capitalized during the year. Actual capital spending is impacted by the net change in capital expenditure accruals.

We intend to continue to selectively add revenue enhancing improvements which we believe will provide a return on investment in excess of our cost of capital. Our objective in redeveloping a community is twofold: we aim to meaningfully grow rental rates while also achieving cap rate compression through asset quality improvement.

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Consolidated Real Estate Under Development and Redevelopment

At March 31, 2017, our development pipeline for two wholly-owned communities totaled 1,101 homes, none of which have been completed, with a budget of $708.5 million, in which we have a carrying value of $393.8 million. The communities are estimated to be completed during the first quarter of 2018 and the first quarter of 2019.

At March 31, 2017, the Company was redeveloping one community, located in Dallas, Texas, which is expected to be completed in the first quarter of 2018. The redevelopment includes the renovation of building exteriors, corridors, and common area amenities as well as individual apartment homes.

Unconsolidated Joint Ventures and Partnerships

The Company recognizes income or losses from our investments in unconsolidated joint ventures and partnerships consisting of our proportionate share of the net income or losses of the joint ventures and partnerships. In addition, we may earn fees for providing management services to the communities held by the unconsolidated joint ventures and partnerships.

The Company’s investment in and advances to unconsolidated joint ventures and partnerships, net, are accounted for under the equity method of accounting. For the three months endedMarch 31, 2017:

• our proportionate share of the net income/(loss) of the joint ventures and partnerships was $11.2 million;

• our investment in unconsolidated joint ventures decreased by $32.3 million primarily due to the acquisition of 100% interest in an operating community previously held as an unconsolidated entity, partially offset by capital contributions; and

• we received distributions of $11.2 million, of which $1.5 million were operating cash flows and $9.7 million were investing cash flows.

We evaluate our investments in unconsolidated joint ventures and partnerships when events or changes in circumstances indicate that there may be an other-than-temporary decline in value. We consider various factors to determine if a decrease in the value of the investment is other-than-temporary. The Company did not recognize any other-than-temporary decreases in the value of its investments in unconsolidated joint ventures or partnerships during the three months endedMarch 31, 2017 and 2016.

Financing Activities

For the three months endedMarch 31, 2017, our Net cash provided by/(used in) financing activities was $42.7 million compared to $(70.6) million for the comparable period of 2016.

The following significant financing activities occurred during the three months endedMarch 31, 2017:

• net proceeds of $220.0 million under our unsecured commercial paper program;

• repaid $99.5 million of secured debt;

• net proceeds of $14.8 million under the Company’s unsecured revolving credit facilities; and

• paid distributions of $78.9 million to our common stockholders.

Credit Facilities and Commercial Paper Program

We have three secured credit facilities with Fannie Mae with an aggregate commitment of $538.4 million, all of which was outstanding as of March 31, 2017. The Fannie Mae credit facilities mature at various dates from May 2017 through July 2020 and bear interest at floating and fixed rates. At March 31, 2017, $355.8 million of the outstanding balance was fixed and had a weighted average interest rate of 5.06% and the remaining balance of $182.6 million had a weighted average variable interest rate of 2.05%. During the three months endedMarch 31, 2017, the Company prepaid $98.3 million of its secured credit facilities with borrowings under the Company's unsecured commercial paper program.

The Company has a $1.1 billion unsecured revolving credit facility (the “Revolving Credit Facility”) and a $350.0 million unsecured term loan facility (the “Term Loan Facility”). The credit agreement for these facilities allows the total commitments under the Revolving Credit Facility and the total borrowings under the Term Loan Facility to be increased to an aggregate maximum amount of up to $2.0 billion, subject to certain conditions, including obtaining commitments from any one or more lenders. The Revolving Credit Facility has a scheduled maturity date of January 31, 2020, with twosix-month extension options, subject to certain conditions. The Term Loan Facility has a scheduled maturity date of January 29, 2021.

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Based on the Company’s current credit rating, the Revolving Credit Facility has an interest rate equal to LIBOR plus a margin of 90 basis points and a facility fee of 15 basis points, and the Term Loan Facility has an interest rate equal to LIBOR plus a margin of 95 basis points. Depending on the Company’s credit rating, the margin under the Revolving Credit Facility ranges from 85 to 155 basis points, the facility fee ranges from 12.5 to 30 basis points, and the margin under the Term Loan Facility ranges from 90 to 175 basis points.

As of March 31, 2017, we had no outstanding borrowings under the Revolving Credit Facility, leaving $1.1 billion of unused capacity (excluding $2.9 million of letters of credit at March 31, 2017), and $350.0 million of outstanding borrowings under the Term Loan Facility.

We have a working capital credit facility, which provides for a $75 million unsecured revolving credit facility (the “Working Capital Credit Facility”) with a scheduled maturity date of January 1, 2019. Based on the Company’s current credit rating, the Working Capital Credit Facility has an interest rate equal to LIBOR plus a margin of 90 basis points. Depending on the Company’s credit rating, the margin ranges from 85 to 155 basis points.

As of March 31, 2017, we had $36.1 million of outstanding borrowings under the Working Capital Credit Facility, leaving $38.9 million of unused capacity.

The Fannie Mae credit facilities and the bank revolving credit facilities are subject to customary financial covenants and limitations, all of which we were in compliance with at March 31, 2017.

On January 23, 2017, we entered into an unsecured commercial paper program. Under the terms of the program, we may issue unsecured commercial paper up to a maximum aggregate amount outstanding of $500 million. The notes are sold under customary terms in the United States commercial paper market and rank pari passu with all of our other unsecured indebtedness. The notes are fully and unconditionally guaranteed by the Operating Partnership. As of March 31, 2017, we had issued $220.0 million of commercial paper, for one month terms, at a weighted average annualized rate of 1.24%, leaving $280.0 million of unused capacity.

Interest Rate Risk

We are exposed to interest rate risk associated with variable rate notes payable and maturing debt that has to be refinanced. We do not hold financial instruments for trading or other speculative purposes, but rather issue these financial instruments to finance our portfolio of real estate assets. Interest rate sensitivity is the relationship between changes in market interest rates and the fair value of market rate sensitive assets and liabilities. Our earnings are affected as changes in short-term interest rates impact our cost of variable rate debt and maturing fixed rate debt. We had $568.4 million in variable rate debt that is not subject to interest rate swap contracts as of March 31, 2017. If market interest rates for variable rate debt increased by 100 basis points, our interest expense for the three months endedMarch 31, 2017 would have increased by $1.4 million based on the average balance outstanding during the period.

These amounts are determined by considering the impact of hypothetical interest rates on our borrowing cost. This analysis does not consider the effects of the adjusted level of overall economic activity that could exist in such an environment. Further, in the event of a change of such magnitude, management would likely 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, the sensitivity analysis assumes no change in our financial structure.

The Company also utilizes derivative financial instruments to manage interest rate risk and generally designates these financial instruments as cash flow hedges. See Note 10, Derivatives and Hedging Activities, in the Notes to the UDR Consolidated Financial Statements included in this Report for additional discussion of derivate instruments.

A presentation of cash flow metrics based on GAAP is as follows (dollars in thousands):

	Three Months Ended
	March 31,
	2017			2016
Net cash provided by/(used in) operating activities	$	120,464		$	112,761
Net cash provided by/(used in) investing activities	(162,789		)	(45,226		)
Net cash provided by/(used in) financing activities	42,673			(70,609		)

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Results of Operations

The following discussion explains the changes in results of operations that are presented in our Consolidated Statements of Operations for the three months endedMarch 31, 2017 and 2016.

Net Income/(Loss) Attributable to Common Stockholders

Net income/(loss) attributable to common stockholders was $25.0 million ($0.09 per diluted share) for the three months endedMarch 31, 2017, as compared to $9.5 million ($0.04 per diluted share) for the comparable period in the prior year. The increase resulted primarily from the following items, all of which are discussed in further detail elsewhere within this Report:

• an increase in total property NOI of $7.3 million primarily due to higher revenue per occupied home and NOI from communities acquired in 2017 and 2016, partially offset by a decrease from sold communities; and

• an increase in income from unconsolidated entities of $10.5 million primarily due to a gain on consolidation of $12.2 million from the purchase of a previously unconsolidated operating community in Seattle, Washington from our West Coast Development Joint Ventures during the three months endedMarch 31, 2017.

This was partially offset by:

• gains, net of tax, of $2.1 million on the sale of a parcel of land in Richmond, Virginia during the three months endedMarch 31, 2017, as compared to gains, net of tax, of $3.1 million from the sale of two parcels of land in Santa Monica, California during the three months endedMarch 31, 2016.

Apartment Community Operations

Our net income results are primarily from NOI generated from the operation of our apartment communities. The Company defines NOI, which is a non-GAAP financial measure, as rental income less direct property rental expenses. Rental income represents gross market rent less adjustments for concessions, vacancy loss and bad debt. Rental expenses include real estate taxes, insurance, personnel, utilities, repairs and maintenance, administrative and marketing. Excluded from NOI is property management expense which is calculated as 2.75% of property revenue to cover the regional supervision and accounting costs related to consolidated property operations and land rent.

Management considers NOI a useful metric for investors as it is a more meaningful representation of a community’s continuing operating performance than net income as it is prior to corporate-level expense allocations, general and administrative costs, capital structure and depreciation and amortization.

Although the Company considers NOI a useful measure of operating performance, NOI should not be considered an alternative to net income or net cash flow from operating activities as determined in accordance with GAAP. NOI excludes several income and expense categories as detailed in the reconciliation of NOI to Net income/(loss) attributable to UDR, Inc. below.

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The following table summarizes the operating performance of our total property NOI for each of the periods presented (dollars in thousands):

	Three Months Ended
	March 31, (a)
	2017			2016			% Change
Same-Store Communities:
Same-store rental income	$	211,586		$	202,285		4.6	%
Same-store operating expense (b)	(60,136		)	(57,922		)	3.8	%
Same-store NOI	151,450			144,363			4.9	%
Non-Mature Communities/Other NOI:
Stabilized, non-mature communities NOI (c)	14,689			11,078			32.6	%
Acquired communities NOI	857			—			—	%
Redevelopment communities NOI	1,066			1,075			(0.8	)%
Development communities NOI	(153		)	(79		)	93.7	%
Non-residential/other NOI	3,575			2,735			30.7	%
Sold and held for disposition communities NOI	(1		)	4,962			(100.0	)%
Total non-mature communities/other NOI	20,033			19,771			1.3	%
Total Property NOI	$	171,483		$	164,134		4.5	%

(a)Same-Store consists of 35,689 apartment homes.

(b)Excludes depreciation, amortization, and property management expenses.

(c) Represents non-mature communities that have achieved 90% occupancy for three consecutive months but do not meet the criteria to be included in Same-Store Communities.

The following table is our reconciliation of Net income/(loss) attributable to UDR, Inc. to total property NOI for the periods presented (dollars in thousands):

	Three Months Ended
	March 31,
	2017			2016
Net income/(loss) attributable to UDR, Inc.	$	25,967		$	10,393
Joint venture management and other fees	(2,570		)	(2,858		)
Property management	6,635			6,379
Other operating expenses	1,691			1,752
Real estate depreciation and amortization	105,032			105,339
General and administrative	13,075			13,844
Casualty-related charges/(recoveries), net	502			—
Other depreciation and amortization	1,608			1,553
(Income)/loss from unconsolidated entities	(11,198		)	(679		)
Interest expense	30,539			31,104
Interest income and other (income)/expense, net	(427		)	(431		)
Tax provision/(benefit), net	332			(403		)
(Gain)/loss on sale of real estate owned, net of tax	(2,132		)	(3,070		)
Net income/(loss) attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	2,338			905
Net income/(loss) attributable to noncontrolling interests	91			306
Total property NOI	$	171,483		$	164,134

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Same-Store Communities

Our Same-Store Community properties (those acquired, developed, and stabilized prior to January 1, 2016 and held on March 31, 2017) consisted of 35,689 apartment homes, and provided 88.3% of our total NOI for the three months endedMarch 31, 2017.

Three Months Ended March 31, 2017 vs. Three Months Ended March 31, 2016

NOI for our Same-Store Community properties increased 4.9% or $7.1 million for the three months endedMarch 31, 2017 compared to the same period in 2016. The increase in property NOI was attributable to a 4.6%, or $9.3 million, increase in property rental income, which was partially offset by a 3.8%, or $2.2 million, increase in operating expenses. The increase in property income was primarily driven by a 3.4% or $6.5 million increase in rental rates and a 11.4%, or $2.0 million, increase in reimbursement and fee income. Physical occupancy increased 0.5% to 96.8% and total monthly income per occupied home increased 4.1% to $2,043.

The increase in operating expenses was primarily driven by a 9.6%, or $2.0 million, increase in real estate taxes, which was primarily due to higher assessed valuations and lower appeal refunds.

As a result of the percentage changes in property rental income and property operating expenses, the operating margin (property net operating income divided by property rental income) increased to 71.6% for the three months endedMarch 31, 2017 as compared to 71.4% for the comparable period in 2016.

Non-Mature Communities/Other

UDR’s Non-Mature Communities/Other represent those communities that do not meet the criteria to be included in Same-Store Communities, which include communities recently developed or acquired, redevelopment properties, sold or held for disposition properties and the non-apartment components of mixed use properties.

Three Months Ended March 31, 2017 vs. Three Months Ended March 31, 2016

The remaining 11.7% or $20.0 million of our total NOI during the three months endedMarch 31, 2017 was generated from our Non-Mature Communities/Other. NOI from Non-Mature Communities/Otherincreased by 1.3%, or $0.3 million, for the three months endedMarch 31, 2017 as compared to the same period in 2016. The increase was primarily attributable to a $3.6 million increase in NOI from stabilized, non-mature communities, a $0.9 million increase in NOI from acquired communities and a $0.8 million increase in non-residential/other NOI, partially offset by a $5.0 million decrease in NOI from sold communities in 2016.

Income/(Loss) from Unconsolidated Entities

For the three months ended ended March 31, 2017 and 2016, we recognized income/(loss) from unconsolidated entities of $11.2 million and $0.7 million, respectively. The increase in income for the three months endedMarch 31, 2017 as compared to 2016 of $10.5 million was primarily due to a gain on consolidation of $12.2 million from the purchase of a previously unconsolidated operating community in Seattle, Washington from our West Coast Development Joint Ventures.

Gain/(Loss) on Sale of Real Estate Owned, Net of Tax

    During the three months endedMarch 31, 2017, the Company recognized a gain, net of tax, of $2.1 million on the sale of a parcel on land in Richmond, Virginia. During the three months endedMarch 31, 2016, the Company recognized gains, net of tax, of $3.1 million on the sale of two parcels of land in Santa Monica, California.

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Inflation

We believe that the direct effects of inflation on our operations have been immaterial. While the impact of inflation primarily impacts our results through wage pressures, utilities and material costs, the majority of our apartment leases have terms of 12 months or less, which generally enables us to compensate for any inflationary effects by increasing rents on our apartment homes. Although an extreme escalation in costs could have a negative impact on our residents and their ability to absorb rent increases, we do not believe this has had a material impact on our results for the three months endedMarch 31, 2017.

Off-Balance Sheet Arrangements

We do not have any off-balance sheet arrangements that have, or are reasonably likely to have, a current or future effect on our financial condition, changes in financial condition, revenue or expenses, results of operations, liquidity, capital expenditures or capital resources that are material.

Funds from Operations, Funds from Operations as Adjusted, and Adjusted Funds from Operations

Funds from Operations

Funds from operations (“FFO”) is defined as net income attributable to common stockholders (computed in accordance with GAAP), excluding impairment write-downs of depreciable real estate or of investments in non-consolidated investees that are driven by measurable decreases in the fair value of depreciable real estate held by the investee, gains or losses from sales of depreciable property, plus real estate depreciation and amortization, and after adjustments for noncontrolling interests, unconsolidated partnerships and joint ventures. This definition conforms with the National Association of Real Estate Investment Trust’s (“NAREIT”) definition issued in April 2002. Historical cost accounting for real estate assets in accordance with GAAP implicitly assumes that the value of real estate assets diminishes predictably over time. Since real estate values instead have historically risen or fallen with market conditions, many industry investors and analysts have considered the presentation of operating results for real estate companies that use historical cost accounting to be insufficient by themselves. Thus, NAREIT created FFO as a supplemental measure of a REIT’s operating performance. In the computation of FFO, diluted, if OP Units, DownREIT Units, unvested restricted stock, stock options, and the shares of Series E Cumulative Convertible Preferred Stock are dilutive, they are included in the diluted share count.

Activities of our taxable REIT subsidiaries (“TRS”)include development and land entitlement. From time to time, we develop and subsequently sell a TRS property which results in a short-term use of funds that produces a profit that differs from the traditional long-term investment in real estate for REITs. We believe that the inclusion of these TRS gains in FFO is consistent with the standards established by NAREIT as the short-term investment is incidental to our main business. TRS gains on sales, net of taxes, are defined as net sales proceeds less a tax provision and the gross investment basis of the asset before accumulated depreciation.

We consider FFO a useful metric for investors as we use FFO in evaluating property acquisitions and our operating performance, and believe that FFO should be considered along with, but not as an alternative to, net income and cash flow as a measure of our activities in accordance with GAAP. FFO does not represent cash generated from operating activities in accordance with GAAP and is not necessarily indicative of funds available to fund our cash needs.

Funds from Operations as Adjusted

FFO as Adjusted is defined as FFO excluding the impact of acquisition-related costs and other non-comparable items including, but not limited to, prepayment costs/benefits associated with early debt retirement, gains on sales of marketable securities and TRS property, deferred tax valuation allowance increases and decreases, casualty-related expenses and recoveries, severance costs and legal costs. Management believes that FFO as Adjusted is useful supplemental information regarding our operating performance as it provides a consistent comparison of our operating performance across time periods and allows investors to more easily compare our operating results with other REITs.

FFO as Adjusted is not intended to represent cash flow or liquidity for the period, and is only intended to provide an additional measure of our operating performance. We believe that Net income/(loss) attributable to common stockholders is the most directly comparable GAAP financial measure to FFO as Adjusted. However, other REITs may use different methodologies for calculating FFO as Adjusted or similar FFO measures and, accordingly, our FFO as Adjusted may not always be comparable

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to FFO as Adjusted or similar FFO measures calculated by other REITs. FFO as Adjusted should not be considered as an alternative to net income (determined in accordance with GAAP) as an indication of financial performance, or as an alternative to cash flows from operating activities (determined in accordance with GAAP) as a measure of our liquidity.

Adjusted Funds from Operations

Adjusted FFO (“AFFO”) is a non-GAAP financial measure that management uses as a supplemental measure of our performance. AFFO is defined as FFO as Adjusted less recurring capital expenditures on consolidated communities that are necessary to help preserve the value of and maintain functionality at our communities. Therefore, management considers AFFO a useful supplemental performance metric for investors as it is more indicative of the Company’s operational performance than FFO or FFO as Adjusted.

AFFO is not intended to represent cash flow or liquidity for the period, and is only intended to provide an additional measure of our operating performance. We believe that Net income/(loss) attributable to common stockholders is the most directly comparable GAAP financial measure to AFFO. Management believes that AFFO is a widely recognized measure of the operations of REITs, and presenting AFFO will enable investors to assess our performance in comparison to other REITs. However, other REITs may use different methodologies for calculating AFFO and, accordingly, our AFFO may not always be comparable to AFFO calculated by other REITs. AFFO should not be considered as an alternative to net income (determined in accordance with GAAP) as an indication of financial performance, or as an alternative to cash flows from operating activities (determined in accordance with GAAP) as a measure of our liquidity, nor is it indicative of funds available to fund our cash needs, including our ability to make distributions.

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The following table outlines our reconciliation ofNet income/(loss) attributable to common stockholders to FFO, FFO as Adjusted, and AFFO for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

	Three Months Ended
	March 31,
	2017			2016
Net income/(loss) attributable to common stockholders	$	25,038		$	9,464
Real estate depreciation and amortization	105,032			105,339
Noncontrolling interests	2,429			1,211
Real estate depreciation and amortization on unconsolidated joint ventures	13,767			10,350
Net gain on the sale of unconsolidated depreciable property	(12,158		)	—
Net gain on the sale of depreciable real estate owned	(552		)	(1,385		)
Funds from operations (“FFO”) attributable to common stockholders and unitholders, basic	$	133,556		$	124,979
Distribution to preferred stockholders — Series E (Convertible)	929			929
FFO attributable to common stockholders and unitholders, diluted	$	134,485		$	125,908
Income/(loss) per weighted average common share - diluted	$	0.09		$	0.04
FFO per common share and unit, basic	$	0.46		$	0.43
FFO per common share and unit, diluted	$	0.45		$	0.43
Weighted average number of common shares and OP/DownREIT Units outstanding — basic	291,752			287,647
Weighted average number of common shares, OP/DownREIT Units, and common stock equivalents outstanding — diluted	296,678			292,504
Impact of adjustments to FFO:
Cost/(benefit) associated with debt extinguishment and other	$	1,516		$	—
Long-term incentive plan transition costs	—			323
Net gain on the sale of non-depreciable real estate owned	(1,580		)	(1,685		)
Casualty-related (recoveries)/charges, net	502			—
Casualty-related (recoveries)/charges on unconsolidated joint ventures, net	(881		)	1,126
	$	(443	)	$	(236	)
FFO as Adjusted attributable to common stockholders and unitholders, diluted	$	134,042		$	125,672
FFO as Adjusted per common share and unit, diluted	$	0.45		$	0.43
Recurring capital expenditures	(6,791		)	(6,961		)
AFFO attributable to common stockholders and unitholders	$	127,251		$	118,711
AFFO per common share and unit, diluted	$	0.43		$	0.41

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The following table is our reconciliation of FFO share information to weighted average common shares outstanding, basic and diluted, reflected on the UDR Consolidated Statements of Operations for the three months endedMarch 31, 2017 and 2016(shares in thousands):

	Three Months Ended
	March 31,
	2017		2016
Weighted average number of common shares and OP/DownREIT Units outstanding — basic	291,752		287,647
Weighted average number of OP/DownREIT Units outstanding	(24,962	)	(25,191	)
Weighted average number of common shares outstanding — basic per the Consolidated Statements of Operations	266,790		262,456
Weighted average number of common shares, OP/DownREIT Units, and common stock equivalents outstanding — diluted	296,678		292,504
Weighted average number of OP/DownREIT Units outstanding	(24,962	)	(25,191	)
Weighted average number of Series E preferred shares outstanding	(3,028	)	(3,028	)
Weighted average number of common shares outstanding — diluted per the Consolidated Statements of Operations	268,688		264,285

United Dominion Realty, L.P.:

Business Overview

United Dominion Realty, L.P. (the “Operating Partnership” or “UDR, L.P.”) is a Delaware limited partnership formed in February 2004 and organized pursuant to the provisions of the Delaware Revised Uniform Limited Partnership Act. The Operating Partnership is the successor-in-interest to United Dominion Realty, L.P., a limited partnership formed under the laws of Virginia, which commenced operations on November 4, 1995. Our sole general partner is UDR, Inc., a Maryland corporation (“UDR” or the “General Partner”), which conducts a substantial amount of its business and holds a substantial amount of its assets through the Operating Partnership. At March 31, 2017, the Operating Partnership’s real estate portfolio included 54 communities located in eight states and the District of Columbia with a total of 16,698 apartment homes.

As of March 31, 2017, UDR owned 110,883 units of our general partnership interests and 174,122,808 units of our limited partnership interests (the “OP Units”), or approximately 95.0% of our outstanding OP Units. By virtue of its ownership of our OP Units and being our sole general partner, UDR has the ability to control all of the day-to-day operations of the Operating Partnership. Unless otherwise indicated or unless the context requires otherwise, all references in this section of this Report to the Operating Partnership or “we,” “us” or “our” refer to UDR, L.P. together with its consolidated subsidiaries, and all references in this section to “UDR” or the “General Partner” refer solely to UDR, Inc.

UDR is a self-administered real estate investment trust, or REIT, that owns, acquires, renovates, develops, and manages apartment communities. The General Partner was formed in 1972 as a Virginia corporation and changed its state of incorporation from Virginia to Maryland in June 2003. At March 31, 2017, the General Partner’s consolidated real estate portfolio included 128 communities located in 10 states and the District of Columbia with a total of 39,698 apartment homes. In addition, the General Partner had an ownership interest in 28 communities with 7,131 completed apartment homes through unconsolidated operating communities.

The Operating Partnership’s same-store community apartment home population for the three months endedMarch 31, 2017 was 15,058.

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The following table summarizes our market information by major geographic markets as of March 31, 2017:

								Three Months Ended
		March 31, 2017						March 31, 2017
Same-Store Communities	Number of Apartment Communities	Number of Apartment Homes	Percentage of Total Carrying Value		Total Carrying Value (in thousands)			Average Physical Occupancy		Monthly Income per Occupied Home (a)
West Region
San Francisco, CA	8	1,992	12.7	%	$	465,508		97.1	%	$	3,011
Orange County, CA	6	2,052	13.4	%	494,598			95.7	%	2,266
Seattle, WA	5	932	6.0	%	220,571			96.9	%	1,885
Los Angeles, CA	2	344	3.0	%	111,072			95.9	%	2,537
Monterey Peninsula, CA	7	1,565	4.6	%	169,221			96.5	%	1,579
Other Southern California	2	516	2.5	%	92,462			94.9	%	1,889
Portland, OR	2	476	1.3	%	47,704			96.7	%	1,529
Mid-Atlantic Region
Metropolitan D.C.	6	2,068	15.0	%	554,444			97.3	%	2,057
Baltimore, MD	2	540	2.8	%	102,406			96.1	%	1,501
Northeast Region
New York, NY	2	996	16.4	%	605,300			97.3	%	3,921
Boston, MA	1	387	1.9	%	70,107			96.1	%	1,935
Southeast Region
Tampa, FL	2	942	2.8	%	104,257			97.1	%	1,383
Nashville, TN	6	1,612	3.8	%	142,362			97.3	%	1,216
Other Florida	1	636	2.3	%	83,595			96.6	%	1,493
Total/Average Same-Store Communities	52	15,058	88.5	%	3,263,607			96.7	%	$	2,085
Non-Mature, Commercial Properties & Other	2	1,640	11.5	%	422,727
Total Real Estate Owned	54	16,698	100.0	%	3,686,334
Total Accumulated Depreciation					(1,445,528		)
Total Real Estate Owned, Net of Accumulated Depreciation					$	2,240,806

(a) Monthly Income per Occupied Home represents total monthly revenues divided by the average physical number of occupied apartment homes in our Same-Store portfolio.

We report in two segments: Same-Store Communities and Non-Mature Communities/Other.

Our Same-Store Communities segment represents those communities acquired, developed, and stabilized prior to January 1, 2016 and held as of March 31, 2017. These communities were owned and had stabilized occupancy and operating expenses as of the beginning of the prior period, there is no plan to conduct substantial redevelopment activities, and the communities are not held for disposition within the current year. A community is considered to have stabilized occupancy once it achieves 90% occupancy for at least three consecutive months.

Our Non-Mature Communities/Other segment represents those communities that do not meet the criteria to be included in Same-Store Communities, including, but not limited to, recently acquired, developed and redeveloped communities, and the non-apartment components of mixed use properties.

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Liquidity and Capital Resources

Liquidity is the ability to meet present and future financial obligations either through operating cash flows, the sale of properties, and the issuance of debt. Both the coordination of asset and liability maturities and effective capital management are important to the maintenance of liquidity. The Operating Partnership’s primary source of liquidity is cash flow from operations as determined by rental rates, occupancy levels, and operating expenses related to our portfolio of apartment homes and borrowings owed by us under the General Partner’s credit agreements. The General Partner will routinely use its unsecured credit facility to temporarily fund certain investing and financing activities prior to arranging for longer-term financing or the issuance of equity or debt securities. During the past several years, proceeds from the sale of real estate have been used for both investing and financing activities as we repositioned our portfolio.

We expect to meet our short-term liquidity requirements generally through net cash provided by operations and borrowings owed by us under the General Partner’s credit agreements. We expect to meet certain long-term liquidity requirements such as scheduled debt maturities and potential property acquisitions through borrowings and the disposition of properties. We believe that our net cash provided by operations and borrowings will continue to be adequate to meet both operating requirements and the payment of distributions. Likewise, the budgeted expenditures for improvements and renovations of certain properties are expected to be funded from property operations, and borrowings owed by us under the General Partner’s credit agreements.

Future Capital Needs

Future capital expenditures are expected to be funded with proceeds from the issuance of secured debt or unsecured debt, sales of properties, borrowings owed by us under our General Partner’s credit agreements, and to a lesser extent, from cash flows provided by operating activities.

As of March 31, 2017, the Operating Partnership did not have any secured debt maturing during the remainder of 2017.

Critical Accounting Policies and Estimates and New Accounting Pronouncements

Our critical accounting policies are those having the most impact on the reporting of our financial condition and results and those requiring significant judgments and estimates. These policies include those related to (1) capital expenditures, (2) impairment of long-lived assets, (3) real estate investment properties, and (4) revenue recognition.

Our critical accounting policies are described in more detail in the section entitled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in the Operating Partnership’s current Report on Form 10-K, filed with the SEC on February 21, 2017. There have been no significant changes in our critical accounting policies from those reported. With respect to these critical accounting policies, we believe that the application of judgments and assessments is consistently applied and produces financial information that fairly depicts the results of operations for all periods presented.

Statements of Cash Flows

The following discussion explains the changes in Net cash provided by/(used in) operating activities, Net cash provided by/(used in) investing activities, and Net cash provided by/(used in) financing activities that are presented in our Consolidated Statements of Cash Flows for the three months endedMarch 31, 2017 and 2016.

Operating Activities

For the three months endedMarch 31, 2017, Net cash provided by/(used in) operating activities was $63.9 million compared to $60.5 million for the comparable period in 2016. The increase in cash flow from operating activities was primarily due to improved operating income, primarily driven by revenue growth at communities.

Investing Activities

For the three months endedMarch 31, 2017, Net cash provided by/(used in) investing activities was $(8.0) million compared to $(6.8) million for the comparable period in 2016. The increase in cash used in investing activities was primarily due to increased capital expenditures.

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Financing Activities

For the three months endedMarch 31, 2017, our Net cash provided by/(used in) financing activities was $(55.8) million compared to $(55.8) million for the comparable period of 2016. Net cash used in financing activities was unchanged primarily due to the early payoff of debt maturing in July 2023 being offset by an increase in advances from the General Partner.

Credit Facilities

As of March 31, 2017, an aggregate commitment of $310.2 million of the General Partner's secured credit facilities with Fannie Mae was owed by the Operating Partnership based on the ownership of the assets securing the debt. The entire commitment was outstanding at March 31, 2017. The portions of the Fannie Mae credit facilities owed by the Operating Partnership mature at various dates from December 2018 through July 2020 and bear interest at floating and fixed rates. At March 31, 2017, $228.9 million of the outstanding balance was fixed at a weighted average interest rate of 5.07% and the remaining balance of $81.3 million on these facilities had a weighted average variable interest rate of 2.34%.

The Operating Partnership is a guarantor on the General Partner’s unsecured revolving credit facility with an aggregate borrowing capacity of $1.1 billion and unsecured commercial paper program with an aggregate borrowing capacity of $500 million, $300 million of medium-term notes due June 2018, $300 million of medium-term notes due October 2020, a $350 million term loan facility due January 2021, $400 million of medium-term notes due January 2022, $300 million of medium-term notes due July 2024, $300 million of medium-term notes due October 2025 and $300 million of medium-term notes due September 2026. As of March 31, 2017 and December 31, 2016, the General Partner did not have an outstanding balance under the unsecured revolving credit facility and had $220.0 million and $0, respectively, of notes outstanding under its unsecured commercial paper program.

The credit facilities are subject to customary financial covenants and limitations.

Interest Rate Risk

We are exposed to interest rate risk associated with variable rate notes payable and maturing debt that has to be refinanced. We do not hold financial instruments for trading or other speculative purposes, but rather issue these financial instruments to finance our portfolio of real estate assets. Interest rate sensitivity is the relationship between changes in market interest rates and the fair value of market rate sensitive assets and liabilities. Our earnings are affected as changes in short-term interest rates impact our cost of variable rate debt and maturing fixed rate debt. We had $108.3 million in variable rate debt that is not subject to interest rate swap contracts as of March 31, 2017. If market interest rates for variable rate debt increased by 100 basis points, our interest expense for the three months endedMarch 31, 2017 would increase by $0.3 million based on the average balance outstanding during the period.

These amounts are determined by considering the impact of hypothetical interest rates on our borrowing cost. These analyses do not consider the effects of the adjusted level of overall economic activity that could exist in such an environment. Further, in the event of a change of such magnitude, management would likely 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, the sensitivity analysis assumes no change in our financial structure.

The General Partner also utilizes derivative financial instruments owed by the Operating Partnership to manage interest rate risk and generally designates these financial instruments as cash flow hedges. See Note 8, Derivatives and Hedging Activities, in the Notes to the Operating Partnership’s Consolidated Financial Statements for additional discussion of derivative instruments.

A presentation of cash flow metrics based on GAAP is as follows (dollars in thousands):

	Three Months Ended March 31,
	2017			2016
Net cash provided by/(used in) operating activities	$	63,900		$	60,525
Net cash provided by/(used in) investing activities	(7,973		)	(6,767		)
Net cash provided by/(used in) financing activities	(55,819		)	(55,759		)

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Results of Operations

The following discussion explains the changes in results of operations that are presented in our Consolidated Statements of Operations for the three months endedMarch 31, 2017 and 2016.

Net Income/(Loss) Attributable to OP Unitholders

Net income attributable to OP unitholders was $13.7 million ($0.07 per diluted OP Unit) for the three months endedMarch 31, 2017 as compared to net income of $4.8 million ($0.03 per diluted OP Unit) for the comparable period in the prior year. The increase in net income attributable to OP unitholders resulted primarily from the following items, which are discussed in further detail elsewhere within this Report:

• an increase of $2.5 million in total property NOI primarily due to higher revenue per occupied home; and

• losses from unconsolidated entities of $5.4 million for the three months endedMarch 31, 2017 as compared to $13.4 million for the three months ended March 31, 2016, primarily due to a reduction in depreciation and amortization at the DownREIT Partnership.

Apartment Community Operations

Our net income results primarily from NOI generated from the operation of our apartment communities. The Operating Partnership defines NOI, which is a non-GAAP financial measure, as rental income less direct property rental expenses. Rental income represents gross market rent less adjustments for concessions, vacancy loss and bad debt. Rental expenses include real estate taxes, insurance, personnel, utilities, repairs and maintenance, administrative and marketing. Excluded from NOI are property management costs, which are the Operating Partnership’s allocable share of costs incurred by the General Partner for shared services of corporate level property management employees and related support functions and costs.

Management considers NOI a useful metric for investors as it is a more meaningful representation of a community’s continuing operating performance than net income as it is prior to corporate-level expense allocations, general and administrative costs, capital structure and depreciation and amortization.

Although we consider NOI a useful measure of operating performance, NOI should not be considered an alternative to net income or net cash flow from operating activities as determined in accordance with GAAP. NOI excludes several income and expense categories as detailed in the reconciliation of NOI to Net income/(loss) attributable to OP unitholders below.

The following table summarizes the operating performance of our total portfolio for the three months endedMarch 31, 2017 and 2016(dollars in thousands):

	Three Months Ended
	March 31, (a)
	2017			2016			% Change
Same-Store Communities:
Same-store rental income	$	91,060		$	86,505		5.3	%
Same-store operating expense (b)	(24,106		)	(22,884		)	5.3	%
Same-store NOI	66,954			63,621			5.2	%
Non-Mature Communities/Other NOI:
Stabilized, non-mature communities NOI (c)	7,122			7,092			0.4	%
Non-residential/other NOI	987			1,073			(8.0	)%
Sold and held for disposition communities NOI	—			766			(100.0	)%
Total non-mature communities/other NOI	8,109			8,931			(9.2	)%
Total Property NOI	$	75,063		$	72,552		3.5	%

(a) Same-Storeconsists of 15,058 apartment homes.

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(b) Excludes depreciation, amortization, and property management expenses.

(c) Represents non-mature communities that have achieved 90% occupancy for three consecutive months but do not meet the criteria to be included in Same-Store Communities.

The following table is our reconciliation of Net income/(loss) attributable to OP unitholdersto total property NOIfor the three months endedMarch 31, 2017 and 2016(dollars in thousands):

	Three Months Ended
	March 31,
	2017		2016
Net income/(loss) attributable to OP unitholders	$	13,657	$	4,787
Property management	2,822		2,717
Other operating expenses	1,548		1,500
Real estate depreciation and amortization	36,879		36,791
General and administrative	5,219		5,421
Casualty-related charges/(recoveries), net	553		—
(Income)/loss from unconsolidated entities	5,424		13,387
Interest expense	8,611		7,605
Net income/(loss) attributable to noncontrolling interests	350		344
Total property NOI	$	75,063	$	72,552

Same-Store Communities

Our Same-Store Community properties (those acquired, developed, and stabilized prior to January 1, 2016 and held as of March 31, 2017) consisted of 15,058 apartment homes and provided 89.2% of our total NOI for the three months endedMarch 31, 2017.

Three Months Ended March 31, 2017 vs. Three Months Ended March 31, 2016

NOI for our Same-Store Community properties increased 5.2%, or $3.3 million, for the three months endedMarch 31, 2017 compared to the same period in 2016. The increase in property NOI was primarily attributable to a 5.3%, or $4.6 million, increase in property rental income, which was partially offset by a 5.3%, or $1.2, million increase in operating expenses. The increase in revenues was primarily driven by a 4.0%, or $3.3 million, increase in rental rates. Physical occupancy increased 0.4% to 96.7% and total income per occupied home increased 4.8% to $2,085 for the three months ended March 31, 2017 compared to the same period in 2016.

The increase in property operating expenses was primarily driven by a 11.4%, or $0.9 million, increase in real estate taxes, which was primarily due to higher assessed valuations and lower appeal refunds, and a 2.3%, or $0.1 million, increase in personnel costs compared to the same period in 2016.

The operating margin (property net operating income divided by property rental income) was 73.5% for both the three months endedMarch 31, 2017 and 2016.

Non-Mature Communities/Other

The Operating Partnership’s Non-Mature Communities/Other represent those communities that do not meet the criteria to be included in Same-Store Communities, which include communities recently developed or acquired, redevelopment properties, sold or held for disposition properties and the non-apartment components of mixed use properties.

Three Months Ended March 31, 2017 vs. Three Months Ended March 31, 2016

The remaining 10.8%, or $8.1 million, of our total NOI during the three months endedMarch 31, 2017 was generated from our Non-Mature Communities/Other. NOI from Non-Mature Communities/Otherdecreased 9.2%, or $0.8 million, for the three months endedMarch 31, 2017 compared to the same period in 2016. The decrease was primarily driven by a decrease in NOI of $0.8 million from sold communities.

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Income/(Loss) in Unconsolidated Entities

For the three months endedMarch 31, 2017, income/(loss) from unconsolidated entities of $(5.4) million was attributable to the Operating Partnership's ownership interest in the DownREIT Partnership as compared to $(13.4) million for the comparable period in 2016. The decrease in loss from unconsolidated entities was primarily attributable to a reduction in deprecation and amortization at the DownREIT Partnership.

Inflation

We believe that the direct effects of inflation on our operations have been immaterial. While the impact of inflation primarily impacts our results through wage pressures, utilities and material costs, the majority of our apartment leases have terms of 12 months or less, which generally enables us to compensate for any inflationary effects by increasing rents on our apartment homes. Although an extreme escalation in costs could have a negative impact on our residents and their ability to absorb rent increases, we do not believe this has had a material impact on our results for the three months endedMarch 31, 2017.

Off-Balance Sheet Arrangements

We do not have any off-balance sheet arrangements that have, or are reasonably likely to have, a current or future effect on our financial condition, changes in financial condition, revenue or expenses, results of operations, liquidity, capital expenditures or capital resources that are material.

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Item 3.        QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The Company and the Operating Partnership are exposed to interest rate changes associated with our unsecured credit facility and other variable rate debt as well as refinancing risk on our fixed rate debt. The Company’s and the Operating Partnership’s involvement with derivative financial instruments is limited and we do not expect to use them for trading or other speculative purposes. The Company and the Operating Partnership use derivative instruments solely to manage their exposure to interest rates.

See our Annual Report on Form 10-K for the year ended December 31, 2016 under the heading “Item 7A. Quantitative and Qualitative Disclosures About Market Risk” for a more complete discussion of our interest rate sensitive assets and liabilities. As of March 31, 2017, our market risk has not changed materially from the amounts reported in our Annual Report on Form 10-K for the year ended December 31, 2016.

Item 4.        CONTROLS AND PROCEDURES

The disclosure controls and procedures of the Company and the Operating Partnership are designed with the objective of ensuring that information required to be disclosed in our reports filed under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Our disclosure controls and procedures are also designed to ensure that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

It should be noted that the design of any system of controls is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions, regardless of how remote. As a result, our disclosure controls and procedures are designed to provide reasonable assurance that such disclosure controls and procedures will meet their objectives.

As of March 31, 2017, we carried out an evaluation, under the supervision and with the participation of the Chief Executive Officer and Chief Financial Officer of the Company, of the effectiveness of the design and operation of the disclosure controls and procedures of the Company and the Operating Partnership. Based on this evaluation, the Chief Executive Officer and Chief Financial Officer of the Company concluded that the disclosure controls and procedures of the Company and the Operating Partnership are effective at the reasonable assurance level described above.

There have not been any changes in either the Company’s or the Operating Partnership’s internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934) during the third fiscal quarter to which this report relates that materially affected, or are reasonably likely to materially affect, the internal control over financial reporting of either the Company or the Operating Partnership.

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PART II — OTHER INFORMATION

Item 1.    LEGAL PROCEEDINGS

The Company is a party to various claims and routine litigation arising in the ordinary course of business. We do not believe that the results of any such claims and litigation, individually or in the aggregate, will have a material adverse effect on our business, financial position or results of operations.

Item 1A. RISK FACTORS

There are many factors that affect the business and the results of operations of the Company and the Operating Partnership, some of which are beyond the control of the Company and the Operating Partnership. The following is a description of important factors that may cause the actual results of operations of the Company and the Operating Partnership in future periods to differ materially from those currently expected or discussed in forward-looking statements set forth in this Report relating to our financial results, operations and business prospects. Forward-looking statements and such risks, uncertainties and other factors speak only as of the date of this Report, and we expressly disclaim any obligation or undertaking to update or revise any forward-looking statement contained herein, to reflect any change in our expectations with regard thereto, or any other change in events, conditions or circumstances on which any such statement is based, except to the extent otherwise required by law.

Risks Related to Our Real Estate Investments and Our Operations

Unfavorable Apartment Market and Economic Conditions Could Adversely Affect Occupancy Levels, Rental Revenues and the Value of Our Real Estate Assets. Unfavorable market conditions in the areas in which we operate and unfavorable economic conditions generally may significantly affect our occupancy levels, our rental rates and collections, the value of the properties and our ability to strategically acquire or dispose of apartment communities on economically favorable terms. Our ability to lease our properties at favorable rates is adversely affected by the increase in supply in the multifamily and other rental markets and is dependent upon the overall level in the economy, which is adversely affected by, among other things, job losses and unemployment levels, recession, personal debt levels, a downturn in the housing market, stock market volatility and uncertainty about the future. Some of our major expenses generally do not decline when related rents decline. We would expect that declines in our occupancy levels, rental revenues and/or the values of our apartment communities would cause us to have less cash available to pay our indebtedness and to distribute to UDR’s stockholders, which could adversely affect our financial condition and the market value of our securities. Factors that may affect our occupancy levels, our rental revenues, and/or the value of our properties include the following, among others:

• downturns in the global, national, regional and local economic conditions, particularly increases in unemployment;

• declines in mortgage interest rates, making alternative housing more affordable;

• government or builder incentives with respect to home ownership, making alternative housing options more attractive;

• local real estate market conditions, including oversupply of, or reduced demand for, apartment homes;

• declines in the financial condition of our tenants, which may make it more difficult for us to collect rents from some tenants;

• changes in market rental rates;

• our ability to renew leases or re-lease space on favorable terms;

• the timing and costs associated with property improvements, repairs or renovations;

• declines in household formation; and

• rent control or stabilization laws, or other laws regulating rental housing, which could prevent us from raising rents to offset increases in operating costs.

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We May Be Unable to Renew Leases or Relet Apartment Units as Leases Expire, or the Terms of Renewals or New Leases May Be Less Favorable Than Current Leases. When our residents decide to leave our apartments, whether because they decide not to renew their leases or they leave prior to their lease expiration date, we may not be able to relet their apartment units. Even if the residents do renew or we can relet the apartment units, the terms of renewal or reletting may be less favorable than current lease terms. Furthermore, because the majority of our apartment leases have terms of 12 months or less, our rental revenues are impacted by declines in market rents more quickly than if our leases were for longer terms. If we are unable to promptly renew the leases or relet the apartment units, or if the rental rates upon renewal or reletting are significantly lower than expected rates, then our results of operations and financial condition may be adversely affected. If residents do not experience increases in their income, we may be unable to increase rent and/or delinquencies may increase.

We Face Certain Risks Related to Our Retail and Commercial Space. Certain of our properties include retail or commercial space that we lease to third parties. The long term nature of our retail and commercial leases (generally five to ten years with market based renewal options) and the characteristics of many of our tenants (generally small and/or local businesses) may subject us to certain risks. The longer term leases could result in below market lease rates over time if we do not accurately judge the potential increases in market rental rates. We may not be able to lease new space for rents that are consistent with our projections or for market rates. Also, when leases for our retail or commercial space expire, the space may not be relet or the terms of reletting, including the cost of allowances and concessions to tenants, may be less favorable than the prior lease terms. Our properties compete with other properties with retail or commercial space. The presence of competitive alternatives may adversely affect our ability to lease space and the level of rents we can obtain. If our retail or commercial tenants experience financial distress or bankruptcy, they may fail to comply with their contractual obligations, seek concessions in order to continue operations or cease their operations, which could materially adversely impact our results of operations and financial condition.

Risk of Inflation/Deflation. Substantial inflationary or deflationary pressures could have a negative effect on rental rates and property operating expenses. The general risk of inflation is that interest on our debt and general and administrative expenses increase at a rate faster than increases in our rental rates, which could materially adversely affect our results of operations, cash flow and ability to make distributions to UDR’s stockholders.

We Are Subject to Certain Risks Associated with Selling Apartment Communities, Which Could Limit Our Operational and Financial Flexibility. We periodically dispose of apartment communities that no longer meet our strategic objectives, but adverse market conditions may make it difficult to sell apartment communities like the ones we own. We cannot predict whether we will be able to sell any property for the price or on the terms we set, or whether any price or other terms offered by a prospective purchaser would be acceptable to us. We also cannot predict the length of time needed to find a willing purchaser and to close the sale of a property. Furthermore, we may be required to expend funds to correct defects or to make improvements before a property can be sold. These conditions may limit our ability to dispose of properties and to change our portfolio promptly in order to meet our strategic objectives, which may in turn have a material adverse effect on our financial condition and the market value of our securities. We are also subject to the following risks in connection with sales of our apartment communities, among others:

• a significant portion of the proceeds from our overall property sales may be held by intermediaries in order for some sales to qualify as like-kind exchanges under Section 1031 of the Internal Revenue Code of 1986, as amended, or the “Code,” so that any related capital gain can be deferred for federal income tax purposes. As a result, we may not have immediate access to all of the cash proceeds generated from our property sales; and

• federal tax laws limit our ability to profit on the sale of communities that we have owned for less than two years, and this limitation may prevent us from selling communities when market conditions are favorable.

Competition Could Limit Our Ability to Lease Apartment Homes or Increase or Maintain Rents. Our apartment communities compete with numerous housing alternatives in attracting residents, including other apartment communities, condominiums and single-family rental homes, as well as owner occupied single- and multi-family homes. Competitive housing in a particular area could adversely affect our ability to lease apartment homes and increase or maintain rents, which could materially adversely affect our results of operations and financial condition.

We May Not Realize the Anticipated Benefits of Past or Future Acquisitions, and the Failure to Integrate Acquired Communities and New Personnel Successfully Could Create Inefficiencies. We have selectively acquired in the past, and if presented with attractive opportunities we intend to selectively acquire in the future, apartment communities that meet our investment criteria. Our acquisition activities and their success are subject to the following risks, among others:

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• we may be unable to obtain financing for acquisitions on favorable terms, including but not limited to interest rates, maturity dates and/or loan-to-value ratios, or at all, all of which could cause us to delay or even abandon potential acquisitions;

• even if we are able to finance the acquisition, cash flow from the acquisition may be insufficient to meet our required principal and interest payments on the debt used to finance the acquisition;

• even if we enter into an acquisition agreement for an apartment community, we may not complete the acquisition for a variety of reasons after incurring certain acquisition-related costs;

• we may incur significant costs and divert management attention in connection with the evaluation and negotiation of potential acquisitions, including potential acquisitions that we are subsequently unable to complete;

• when we acquire an apartment community, we may invest additional amounts in it with the intention of increasing profitability, and these additional investments may not produce the anticipated improvements in profitability;

• the expected occupancy rates and rental rates may differ from actual results; and

• we may be unable to quickly and efficiently integrate acquired apartment communities and new personnel into our existing operations, and the failure to successfully integrate such apartment communities or personnel will result in inefficiencies that could materially adversely affect our expected return on our investments and our overall profitability.

Competition Could Adversely Affect Our Ability to Acquire Properties. In the past, other real estate investors, including insurance companies, pension and investment funds, developer partnerships, investment companies and other public and private apartment REITs, have competed with us to acquire existing properties and to develop new properties, and such competition in the future may make it more difficult for us to pursue attractive investment opportunities on favorable terms, which could materially adversely affect our ability to grow or acquire properties profitably or with attractive returns.

Development and Construction Risks Could Impact Our Profitability. In the past we have selectively pursued the development and construction of apartment communities, and we intend to do so in the future as appropriate opportunities arise. Development activities have been, and in the future may be, conducted through wholly-owned affiliated companies or through joint ventures with unaffiliated parties. Our development and construction activities are subject to the following risks, among others:

• we may be unable to obtain construction financing for development activities on favorable terms, including but not limited to interest rates, maturity dates and/or loan to value ratios, or at all, which could cause us to delay or even abandon potential developments;

• we may be unable to obtain, or face delays in obtaining, necessary zoning, land-use, building, occupancy and other required governmental permits and authorizations, which could result in increased development costs, could delay initial occupancy dates for all or a portion of a development community, and could require us to abandon our activities entirely with respect to a project for which we are unable to obtain permits or authorizations;

• yields may be less than anticipated as a result of delays in completing projects, costs that exceed budget and/or higher than expected concessions for lease up and lower rents than expected;

• if we are unable to find joint venture partners to help fund the development of a community or otherwise obtain acceptable financing for the developments, our development capacity may be limited;

• we may abandon development opportunities that we have already begun to explore, and we may fail to recover expenses already incurred in connection with exploring such opportunities;

• we may be unable to complete construction and lease-up of a community on schedule, or incur development or construction costs that exceed our original estimates, and we may be unable to charge rents that would compensate for any increase in such costs;

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• occupancy rates and rents at a newly developed community may fluctuate depending on a number of factors, including market and economic conditions, preventing us from meeting our profitability goals for that community; and

• when we sell to third parties communities or properties that we developed or renovated, we may be subject to warranty or construction defect claims that are uninsured or exceed the limits of our insurance.

In some cases in the past, the costs of upgrading acquired communities have exceeded our original estimates. We may experience similar cost increases in the future. Our inability to charge rents that will be sufficient to offset the effects of any increases in these costs may impair our profitability, which could have a material adverse effect on out results of operations and financial condition.

Bankruptcy or Defaults of Our Counterparties Could Adversely Affect Our Performance. We have relationships with and, from time to time, we execute transactions with or receive services from many counterparties, such as general contractors engaged in connection with our development activities. As a result, bankruptcies or defaults by these counterparties could result in services not being provided, projects not being completed on time, or on budget, or at all, or volatility in the financial markets and economic weakness could affect the counterparties’ ability to complete transactions with us as intended, both of which could result in disruptions to our operations that may materially adversely affect our business and results of operations.

Property Ownership Through Partnerships and Joint Ventures May Limit Our Ability to Act Exclusively in Our Interest. We have in the past and may in the future develop and/or acquire properties in partnerships and joint ventures with other persons or entities when we believe circumstances warrant the use of such structures. We currently have 17 active joint ventures and partnerships, including our participating loan investment and preferred equity investments, with a total equity investment of $819.0 million. We could become engaged in a dispute with one or more of our partners which might affect our ability to operate a jointly-owned property. Moreover, our partners may have business, economic or other objectives that are inconsistent with our objectives, including objectives that relate to the appropriate timing and terms of any sale or refinancing of a property. In some instances, our partners may have competing interests in our markets that could create conflicts of interest. Also, our partners might refuse to make capital contributions when due and we may be responsible to our partners for indemnifiable losses. In general, we and our partners may each have the right to trigger a buy-sell arrangement, which could cause us to sell our interest, or acquire our partners’ interest, at a time when we otherwise would not have initiated such a transaction and may result in the valuation of our interest in the partnership or joint venture (if we are the seller) or of the other partner’s interest in the partnership or joint venture (if we are the buyer) at levels which may not be representative of the valuation that would result from an arm’s length marketing process.

We are also subject to risk in cases where an institutional owner is our partner, including (i) a deadlock if we and our partner are unable to agree upon certain major and other decisions, (ii) the limitation of our ability to liquidate our position in the partnership or joint venture without the consent of the other partner, and (iii) the requirement to provide guarantees in favor of lenders with respect to the indebtedness of the joint venture.

We may not be permitted to dispose of certain properties or pay down the indebtedness associated with those properties when we might otherwise desire to do so without incurring additional costs. In connection with certain property acquisitions, we have agreed with the sellers that we will not dispose of the acquired properties or reduce the mortgage indebtedness on such properties for significant periods of time unless we pay certain of the resulting tax costs of the sellers, and we may enter into similar agreements in connection with future property acquisitions. These agreements could result in us retaining properties that we would otherwise sell or not paying down or refinancing indebtedness that we would otherwise pay down or refinance. However, subject to certain conditions, we retain the right to substitute other property or debt to meet these obligations to the sellers.

We Could Incur Significant Insurance Costs and Some Potential Losses May Not Be Adequately Covered by Insurance. We have a comprehensive insurance program covering our property and operating activities with limits of liability customary within the multifamily industry. We believe the policy specifications and insured limits of these policies are adequate and appropriate. There are, however, certain types of extraordinary losses which may not be adequately covered under our insurance program. In addition, we will sustain losses due to insurance deductibles, self-insured retention, uninsured claims or casualties, or losses in excess of applicable coverage.

If an uninsured loss or a loss in excess of insured limits occurs, we could lose all or a portion of the capital we have invested in a property, as well as the anticipated future revenue from the property. In such an event, we might nevertheless remain obligated for any mortgage debt or other financial obligations related to the property. Material losses in excess of

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insurance proceeds may occur in the future. If one or more of our properties were to experience a catastrophic loss, it could seriously disrupt our operations, delay revenue and result in large expenses to repair or rebuild the property. Such events could materially and adversely affect our cash flow and ability to make distributions.

As a result of our substantial real estate holdings, the cost of insuring our apartment communities is a significant component of expense. Insurance premiums are subject to significant increases and fluctuations, which are generally outside of our control. We insure our properties with insurance companies that we believe have a good rating at the time our policies are put into effect. The financial condition of one or more of our insurance companies that we hold policies with may be negatively impacted, which could result in their inability to pay on future insurance claims. Their inability to pay future claims may have a negative impact on our financial results. In addition, the failure of one or more insurance companies may increase the costs to renew or replace our insurance policies or increase the cost of insuring additional properties and recently developed or redeveloped properties.

Failure to Succeed in New Markets May Limit Our Growth. We have acquired in the past, and we may acquire in the future if appropriate opportunities arise, apartment communities that are outside of our existing markets. Entering into new markets may expose us to a variety of risks, and we may not be able to operate successfully in new markets. These risks include, among others:

• inability to accurately evaluate local apartment market conditions and local economies;

• inability to hire and retain key personnel;

• lack of familiarity with local governmental and permitting procedures; and

• inability to achieve budgeted financial results.

Potential Liability for Environmental Contamination Could Result in Substantial Costs. Under various federal, state and local environmental laws, as a current or former owner or operator of real estate, we could be required to investigate and remediate the effects of contamination of currently or formerly owned real estate by hazardous or toxic substances, often regardless of our knowledge of or responsibility for the contamination and solely by virtue of our current or former ownership or operation of the real estate. In addition, we could be held liable to a governmental authority or to third parties for property damage and for investigation and clean-up costs incurred in connection with the contamination. These costs could be substantial, and in many cases environmental laws create liens in favor of governmental authorities to secure their payment. The presence of such substances or a failure to properly remediate any resulting contamination could materially and adversely affect our ability to borrow against, sell or rent an affected property.

In addition, our properties are subject to various federal, state and local environmental, health and safety laws, including laws governing the management of wastes and underground and aboveground storage tanks. Noncompliance with these environmental, health and safety laws could subject us to liability. Changes in laws could increase the potential costs of compliance with environmental laws, health and safety laws or increase liability for noncompliance. This may result in significant unanticipated expenditures or may otherwise materially and adversely affect our cash flow and results of operations.

As the owner or operator of real property, we may also incur liability based on various building conditions. For example, buildings and other structures on properties that we currently own or operate or those we acquire or operate in the future contain, may contain, or may have contained, asbestos-containing material, or ACM. Environmental, health and safety laws require that ACM be properly managed and maintained and may impose fines or penalties on owners, operators or employers for non-compliance with those requirements.

These requirements include special precautions, such as removal, abatement or air monitoring, if ACM would be disturbed during maintenance, renovation or demolition of a building, potentially resulting in substantial costs. In addition, we may be subject to liability for personal injury or property damage sustained as a result of exposure to ACM or releases of ACM into the environment.

We cannot assure you that costs or liabilities incurred as a result of environmental issues will not affect our ability to make distributions to our stockholders, or that such costs or liabilities will not have a material adverse effect on our financial condition and results of operations.

Our Properties May Contain or Develop Harmful Mold or Suffer from Other Indoor Air Quality Issues, Which Could Lead to Liability for Adverse Health Effects or Property Damage or Cost for Remediation. When excessive moisture

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accumulates in buildings or on building materials, mold growth may occur, particularly if the moisture problem remains undiscovered or is not addressed over a period of time. Some molds may produce airborne toxins or irritants. Indoor air quality issues can also stem from inadequate ventilation, chemical contamination from indoor or outdoor sources, and other biological contaminants such as pollen, viruses and bacteria. Indoor exposure to airborne toxins or irritants can be alleged to cause a variety of adverse health effects and symptoms, including allergic or other reactions. As a result, the presence of significant mold or other airborne contaminants at any of our properties could require us to undertake a costly remediation program to contain or remove the mold or other airborne contaminants or to increase ventilation, which could adversely affect our results of operations and cash flow. In addition, the presence of significant mold or other airborne contaminants could expose us to liability from our tenants or others if property damage or personal injury occurs.

Compliance or Failure to Comply with the Americans with Disabilities Act of 1990 or Other Safety Regulations and Requirements Could Result in Substantial Costs. The Americans with Disabilities Act generally requires that public buildings, including our properties, be made accessible to disabled persons. Noncompliance could result in the imposition of fines by the federal government or the award of damages to private litigants. From time to time, claims may be asserted against us with respect to some of our properties under the Americans with Disabilities Act. If, under the Americans with Disabilities Act, we are required to make substantial alterations and capital expenditures in one or more of our properties, including the removal of access barriers, it could adversely affect our financial condition and results of operations.

Our properties are subject to various federal, state and local regulatory requirements, such as state and local fire and life safety requirements. If we fail to comply with these requirements, we could incur fines or private damage awards. We do not know whether existing requirements will change or whether compliance with future requirements will require significant unanticipated expenditures that will affect our cash flow and results of operations.

Compliance with or Changes in Real Estate Tax and Other Laws and Regulations Could Adversely Affect Our Funds from Operations and Our Ability to Make Distributions to Stockholders. We are subject to federal, state and local laws, regulations, rules and ordinances at locations where we operate regarding a wide variety of matters that could affect, directly or indirectly, our operations. Generally, we do not directly pass through costs resulting from compliance with or changes in real estate tax laws to residential property tenants. We also do not generally pass through increases in income, service or other taxes to tenants under leases. These costs may adversely affect net operating income and the ability to make distributions to stockholders. Similarly, compliance with or changes in (i) laws increasing the potential liability for environmental conditions existing on properties or the restrictions on discharges or other conditions or (ii) rent control or rent stabilization laws or other laws and regulations regulating housing, such as the Americans with Disabilities Act and the Fair Housing Amendments Act of 1988, may result in significant unanticipated expenditures, which would adversely affect our funds from operations and the ability to make distributions to stockholders.

Risk of Damage from Catastrophic Weather and Natural Events and Potential Climate Change. Certain of our communities are located in areas that may experience catastrophic weather and other natural events from time to time, including mudslides, fires, hurricanes, tornadoes, snow or ice storms, or other severe inclement weather. These adverse weather and natural events could cause damage or losses that may be greater than insured levels. In the event of a loss in excess of insured limits, we could lose our capital invested in the affected community, as well as anticipated future revenue from that community. We would also continue to be obligated to repay any mortgage indebtedness or other obligations related to the community. Any such loss could materially and adversely affect our business, financial condition and results of operations.

To the extent that we experience any significant changes in the climate in areas where our communities are located, we may experience extreme weather conditions and prolonged changes in precipitation and temperature, all of which could result in physical damage to, and/or a decrease in demand for, our communities located in these areas. Should the impact of such climate change be material in nature, or occur for lengthy periods of time, our financial condition and results of operations may be adversely affected.

Risk of Earthquake Damage. Some of our communities are located in the general vicinity of active earthquake faults. We cannot assure you that an earthquake would not cause damage or losses greater than insured levels. In the event of a loss in excess of insured limits, we could lose our capital invested in the affected community, as well as anticipated future revenue from that community. We may also continue to be obligated to repay any mortgage indebtedness or other obligations related to the community. Any such loss could materially and adversely affect our business, financial condition and results of operations. Insurance coverage for earthquakes can be costly due to limited industry capacity. As a result, we may experience shortages in desired coverage levels if market conditions are such that insurance is not available or the cost of insurance makes it, in management’s view, economically impractical.

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Risk of Accidental Death Due to Fire, Natural Disasters or Other Hazards. The accidental death of persons living in our communities due to fire, natural disasters or other hazards could have a material adverse effect on our business and results of operations. Our insurance coverage may not cover all losses associated with such events, and we may experience difficulty marketing communities where such any such events have occurred, which could have a material adverse effect on our business and results of operations.

Actual or Threatened Terrorist Attacks May Have an Adverse Effect on Our Business and Operating Results and Could Decrease the Value of Our Assets. Actual or threatened terrorist attacks and other acts of violence or war could have a material adverse effect on our business and operating results. Attacks that directly impact one or more of our apartment communities could significantly affect our ability to operate those communities and thereby impair our ability to achieve our expected results. Further, our insurance coverage may not cover all losses caused by a terrorist attack. In addition, the adverse effects that such violent acts and threats of future attacks could have on the U.S. economy could similarly have a material adverse effect on our business and results of operations.

Mezzanine Loan Assets Involve Greater Risks of Loss than Senior Loans Secured by Income-producing Properties. We may acquire mezzanine loans, which take the form of subordinated loans secured by second mortgages on the underlying property or loans secured by a pledge of the ownership interests of either the entity owning the property or a pledge of the ownership interests of the entity that owns the interest in the entity owning the property. Mezzanine loans may involve a higher degree of risk than long-term senior mortgage lending secured by income-producing real property, because the loan may become unsecured as a result of foreclosure by the senior lender and because it is in second position and there may not be adequate equity in the property. In the event of a bankruptcy of the entity providing the pledge of its ownership interests as security, we may not have full recourse to the assets of such entity, or the assets of the entity may not be sufficient to satisfy our mezzanine loan. If a borrower defaults on our mezzanine loan or debt senior to our loan, or in the event of a borrower bankruptcy, our mezzanine loan will be satisfied only after the senior debt. As a result, we may not recover some of or all our initial expenditure. In addition, mezzanine loans may have higher loan-to-value ratios than conventional mortgage loans, resulting in less equity in the property and increasing the risk of loss of principal.

Risk Related to Preferred Equity Investments. We may make preferred equity investments in corporations, limited partnerships, limited liability companies or other entities that have been formed for the purpose of acquiring, developing or managing real property. With preferred equity investments, our interest in a particular entity will be less than a majority of the outstanding voting interests of that entity. Generally, we will not have the ability to control the daily operations of the entity, and we will not have the ability to select or remove a majority of the members of the board of directors, managers, general partner or partners or similar governing body of the entity or otherwise control its operations. Although we would seek to maintain sufficient influence over the entity to achieve our objectives, the owner of the majority of the voting interests may have interests that differ from ours and may be in a position to take actions without our consent or that are inconsistent with our interests. Further, if the owner of the majority of the voting interests were to fail to invest capital in the entity, we may have to invest additional capital to protect our investment. The owner of the majority of the voting interests may fail to develop or operate the real property in the manner intended and as a result the entity may not be able to redeem our investment or pay the return expected to us in a timely manner if at all. In addition, we may not be able to dispose of our investment in the entity in a timely manner or at the price at which we would want to divest. In the event that such an entity fails to meet expectations or becomes insolvent, we may lose our entire investment in the entity.

We May Experience a Decline in the Fair Value of Our Assets and Be Forced to Recognize Impairment Charges, Which Could Materially and Adversely Impact Our Financial Condition, Liquidity and Results of Operations and the Market Price of UDR’s Common Stock. A decline in the fair value of our assets may require us to recognize an impairment against such assets under generally accepted accounting principles as in effect in the United States (“GAAP”), if we were to determine that, with respect to any assets in unrealized loss positions, we do not have the ability and intent to hold such assets to maturity or for a period of time sufficient to allow for recovery to the amortized cost of such assets. If such a determination were to be made, we would recognize unrealized losses through earnings and write down the amortized cost of such assets to a new cost basis, based on the fair value of such assets on the date they are considered to be impaired. Such impairment charges reflect non-cash losses at the time of recognition; subsequent disposition or sale of such assets could further affect our future losses or gains, as they are based on the difference between the sale price received and adjusted amortized cost of such assets at the time of sale. If we are required to recognize asset impairment charges in the future, these charges could materially and adversely affect our financial condition, liquidity, results of operations and the per share trading price of UDR’s common stock.

Any Material Weaknesses Identified in Our Internal Control Over Financial Reporting Could Have an Adverse Effect on UDR’s Stock Price. Section 404 of the Sarbanes-Oxley Act of 2002 requires us to evaluate and report on our internal control over financial reporting. If we identify one or more material weaknesses in our internal control over financial reporting, we

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could lose investor confidence in the accuracy and completeness of our financial reports, which in turn could have an adverse effect on the per share trading price of UDR’s common stock.

Our Business and Operations Would Suffer in the Event of System Failures or Breaches in Data Security. Despite system redundancy, the implementation of security measures and the existence of a disaster recovery plan for our internal information technology systems, our systems and systems maintained by third party vendors are vulnerable to damages from any number of sources, including computer viruses, unauthorized access, energy blackouts, natural disasters, terrorism, war, and telecommunication failures. We rely on information technology networks and systems, including the Internet and networks and systems maintained and controlled by third party vendors, to process, transmit and store electronic information and to manage or support a variety of our business processes, including financial transactions and keeping of records, which may include personal identifying information of tenants and lease data. We rely on commercially available systems, software, tools and monitoring to provide security for processing, transmitting and storing confidential tenant information, such as individually identifiable information relating to financial accounts. Although we take steps, and generally require third party vendors to take steps, to protect the security of the data maintained in our and their information systems, it is possible that our or their security measures will not be able to prevent the systems’ improper functioning, or the improper disclosure of personally identifiable information, such as in the event of cyber-attacks. Security breaches, including physical or electronic break-ins, computer viruses, attacks by hackers and similar breaches, can create system disruptions, shutdowns or unauthorized disclosure of confidential information. Any failure to maintain proper function, security and availability of our or third party vendors’ information systems could interrupt our operations, damage our reputation, subject us to liability claims or regulatory penalties and could materially and adversely affect us.

Social Media Presents Risks. The use of social media could cause us to suffer brand damage or unintended information disclosure. Negative posts or communications about us on a social networking website could damage our reputation. Further, employees or others may disclose non-public information regarding us or our business or otherwise make negative comments regarding us on social networking or other websites, which could adversely affect our business and results of operations. As social media evolves we will be presented with new and risks and challenges.

Our Success Depends on Our Senior Management. Our success depends upon the retention of our senior management, whose continued service is not guaranteed. We may not be able to find qualified replacements for the individuals who make up our senior management if their services should no longer be available to us. The loss of services of one or more members of our senior management team could have a material adverse effect on our business, financial condition and results of operations.

Changes in U.S. Accounting Standards May Materially and Adversely Affect Our Reported Results of Operations. Accounting for public companies in the United States is in accordance with GAAP, which is established by the Financial Accounting Standards Board (the “FASB”), an independent body whose standards are recognized by the SEC as authoritative for publicly held companies. Uncertainties posed by various initiatives of accounting standard-setting by the FASB and the SEC, which create and interpret applicable accounting standards for U.S. companies, may change the financial accounting and reporting standards or their interpretation and application of these standards that govern the preparation of our financial statements. These changes could have a material impact on our reported financial condition and results of operations. In some cases, we could be required to apply a new or revised standard retroactively, resulting in potentially material restatements of prior period financial statements.

Risks Related to Our Indebtedness and Financings

Insufficient Cash Flow Could Affect Our Debt Financing and Create Refinancing Risk. We are subject to the risks normally associated with debt financing, including the risk that our operating income and cash flow will be insufficient to make required payments of principal and interest, or could restrict our borrowing capacity under our line of credit due to debt covenant restraints. Sufficient cash flow may not be available to make all required principal payments and still satisfy UDR’s distribution requirements to maintain its status as a REIT for federal income tax purposes. In addition, the full limits of our line of credit may not be available to us and we may not be able to access the commercial paper market if our operating performance falls outside the constraints of our debt covenants. We are also likely to need to refinance substantially all of our outstanding debt as it matures. We may not be able to refinance existing debt, or the terms of any refinancing may not be as favorable as the terms of the existing debt, which could create pressures to sell assets or to issue additional equity when we would otherwise not choose to do so. In addition, our failure to comply with our debt covenants could result in a requirement to repay our indebtedness prior to its maturity, which could have a material adverse effect on our financial condition, cash flow, increase our financing costs and impact our ability to make distributions to UDR’s stockholders.

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Failure to Generate Sufficient Revenue Could Impair Debt Service Payments and Distributions to Stockholders. If our apartment communities do not generate sufficient net rental income to meet rental expenses, our ability to make required payments of interest and principal on our debt securities and to pay distributions to UDR’s stockholders will be adversely affected. The following factors, among others, may affect the net rental income generated by our apartment communities:

• the national and local economies;

• local real estate market conditions, such as an oversupply of apartment homes;

• tenants’ perceptions of the safety, convenience, and attractiveness of our communities and the neighborhoods where they are located;

• our ability to provide adequate management, maintenance and insurance;

• rental expenses, including real estate taxes and utilities;

• competition from other apartment communities;

• changes in interest rates and the availability of financing;

• changes in governmental regulations and the related costs of compliance; and

• changes in tax and housing laws, including the enactment of rent control laws or other laws regulating multifamily housing.

Expenses associated with our investment in an apartment community, such as debt service, real estate taxes, insurance and maintenance costs, are generally not reduced when circumstances cause a reduction in rental income from that community. If a community is mortgaged to secure payment of debt and we are unable to make the mortgage payments, we could sustain a loss as a result of foreclosure on the community or the exercise of other remedies by the mortgage holder.

Changing Interest Rates Could Increase Interest Costs and Adversely Affect Our Cash Flow and the Market Price of Our Securities. We currently have, and expect to incur in the future, interest-bearing debt, including unsecured commercial paper, at rates that vary with market interest rates. As of March 31, 2017, UDR had approximately $568.4 million of variable rate indebtedness outstanding, which constitutes approximately 16.1% of total outstanding indebtedness as of such date. As of March 31, 2017, the Operating Partnership had approximately $108.3 million of variable rate indebtedness outstanding, which constitutes approximately 32.1% of total outstanding indebtedness to third parties as of such date. In addition, borrowings under our unsecured commercial paper program bear interest at variable rates. An increase in interest rates would increase our interest expenses and increase the costs of refinancing existing indebtedness and of issuing new debt, including unsecured commercial paper. Accordingly, higher interest rates could adversely affect cash flow and our ability to service our debt and to make distributions to security holders. The effect of prolonged interest rate increases could negatively impact our ability to make acquisitions and develop properties.

Our Debt Level May Be Increased. Our current debt policy does not contain any limitations on the level of debt that we may incur, although our ability to incur debt is limited by covenants in our bank and other credit agreements. We manage our debt to be in compliance with these debt covenants, but subject to compliance with these covenants, we may increase the amount of our debt at any time without a concurrent improvement in our ability to service the additional debt.

Financing May Not Be Available and Could Be Dilutive. Our ability to execute our business strategy depends on our access to an appropriate blend of debt financing, including unsecured lines of credit, construction loans and other forms of secured debt, commercial paper and other forms of unsecured debt, and equity financing, including common and preferred equity. We and other companies in the real estate industry have experienced limited availability of financing from time to time, including due to regulatory changes directly or indirectly affecting financing markets, for example the changes in terms on construction loans brought about by the Basel III capital requirements and the associated “High Volatility Commercial Real Estate” designation, which has adversely impacted the availability of loans, including construction loans and proceeds and the interest rate thereon. Restricted lending practices could impact our ability to obtain financing or refinancing for our properties. If we issue additional equity securities to finance developments and acquisitions instead of incurring debt, the interests of UDR's existing stockholders could be diluted.

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Failure To Maintain Our Current Credit Ratings Could Adversely Affect Our Cost of Funds, Related Margins, Liquidity, and Access to Capital Markets. Moody’s and Standard & Poor’s, routinely evaluate our debt and have given us ratings on our senior unsecured debt, commercial paper program and preferred stock. These ratings are based on a number of factors, which included their assessment of our financial strength, liquidity, capital structure, asset quality, and sustainability of cash flow and earnings. Due to changes in these factors and market conditions, we may not be able to maintain our current credit ratings, which could adversely affect our cost of funds and related margins, liquidity, and access to capital markets, including our ability to access the commercial paper market.

Disruptions in Financial Markets May Adversely Impact Availability and Cost of Credit and Have Other Adverse Effects on Us and the Market Price of UDR’s Stock. Our ability to make scheduled payments on, or to refinance, our debt obligations will depend on our operating and financial performance, which in turn is subject to prevailing economic conditions and to financial, business and other factors beyond our control. During the global financial crisis and the economic recession that followed it, the United States stock and credit markets experienced significant price volatility, dislocations and liquidity disruptions, which caused market prices of many stocks to fluctuate substantially and the spreads on debt financings to widen considerably. Those circumstances materially impacted liquidity in the financial markets at times, making terms for certain financings less attractive, and in some cases resulted in the unavailability of financing, such as the commercial paper market. Any future disruptions or uncertainty in the stock and credit markets may negatively impact our ability to refinance existing indebtedness and access additional financing for acquisitions, development of our properties and other purposes at reasonable terms or at all, which may negatively affect our business and the market price of UDR’s common stock. If we are not successful in refinancing our existing indebtedness when it becomes due, we may be forced to dispose of properties on disadvantageous terms, which might adversely affect our ability to service other debt and to meet our other obligations. A prolonged downturn in the financial markets may cause us to seek alternative sources of potentially less attractive financing, and may require us to adjust our business plan accordingly. These events also may make it more difficult or costly for us to raise capital through the issuance of UDR’s common or preferred stock.

A Change in U.S. Government Policy or Support Regarding Fannie Mae or Freddie Mac Could Have a Material Adverse Impact on Our Business. While in recent years we have decreased our borrowing from Fannie Mae and Freddie Mac, Fannie Mae and Freddie Mac are a major source of financing to participants in the multifamily housing market including potential purchasers of our properties. Potential options for the future of agency mortgage financing in the U.S. have been suggested, including options that could involve a reduction in the amount of financing Fannie Mae and Freddie Mac are able to provide, limitations on the loans that the agencies may make, which may not include loans secured by properties like our properties, or the phase out of Fannie Mae and Freddie Mac. While we believe Fannie Mae and Freddie Mac will continue to provide liquidity to our sector, should they discontinue doing so, have their mandates changed or reduced or be disbanded or reorganized by the government, or if there is reduced government support for multifamily housing generally, it may adversely affect interest rates, capital availability, development of multifamily communities and the value of multifamily residential real estate and, as a result, may adversely affect our business and results of operations.

The Soundness of Financial Institutions Could Adversely Affect Us. We have relationships with many financial institutions, including lenders under our credit facilities, and, from time to time, we execute transactions with counterparties in the financial services industry. As a result, defaults by, or even rumors or questions about, financial institutions or the financial services industry generally, could result in losses or defaults by these institutions. In the event that the volatility of the financial markets adversely affects these financial institutions or counterparties, we or other parties to the transactions with us may be unable to complete transactions as intended, which could adversely affect our business and results of operations.

Interest Rate Hedging Contracts May Be Ineffective and May Result in Material Charges. From time to time when we anticipate issuing debt securities, we may seek to limit our exposure to fluctuations in interest rates during the period prior to the pricing of the securities by entering into interest rate hedging contracts. We may do this to increase the predictability of our financing costs. Also, from time to time we may rely on interest rate hedging contracts to limit our exposure under variable rate debt to unfavorable changes in market interest rates. If the terms of new debt securities are not within the parameters of, or market interest rates fall below that which we incur under a particular interest rate hedging contract, the contract is ineffective. Furthermore, the settlement of interest rate hedging contracts has involved and may in the future involve material charges. In addition, our use of interest rate hedging arrangements may expose us to additional risks, including a risk that a counterparty to a hedging arrangement may fail to honor its obligations. Developing an effective interest rate risk strategy is complex and no strategy can completely insulate us from risks associated with interest rate fluctuations. There can be no assurance that our hedging activities will have the desired beneficial impact on our results of operations or financial condition. Termination of these hedging agreements typically involves costs, such as transaction fees or breakage costs.

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Risks Related to Tax Laws

We Would Incur Adverse Tax Consequences if UDR Failed to Qualify as a REIT. UDR has elected to be taxed as a REIT under the Code. Our qualification as a REIT requires us to satisfy numerous requirements, some on an annual and quarterly basis, established under highly technical and complex Code provisions for which there are only limited judicial or administrative interpretations, and involves the determination of various factual matters and circumstances not entirely within our control. We intend that our current organization and method of operation enable us to continue to qualify as a REIT, but we may not so qualify or we may not be able to remain so qualified in the future. In addition, U.S. federal income tax laws governing REITs and other corporations and the administrative interpretations of those laws may be amended at any time, potentially with retroactive effect. Future legislation, new regulations, administrative interpretations or court decisions could adversely affect our ability to qualify as a REIT or adversely affect UDR’s stockholders.

If we fail to qualify as a REIT in any taxable year, we would be subject to federal income tax (including any applicable alternative minimum tax) on our taxable income at regular corporate rates, and would not be allowed to deduct dividends paid to UDR’s stockholders in computing our taxable income. Also, unless the Internal Revenue Service granted us relief under certain statutory provisions, we could not re-elect REIT status until the fifth calendar year after the year in which we first failed to qualify as a REIT. The additional tax liability from the failure to qualify as a REIT would reduce or eliminate the amount of cash available for investment or distribution to UDR’s stockholders. This would likely have a significant adverse effect on the value of our securities and our ability to raise additional capital. In addition, we would no longer be required to make distributions to UDR’s stockholders. Even if we continue to qualify as a REIT, we will continue to be subject to certain federal, state and local taxes on our income and property.

Certain of our subsidiaries have also elected to be taxed as REITs under the Code, and are therefore subject to the same risks in the event that any such subsidiary fails to qualify as a REIT in any taxable year.

Dividends Paid By REITs Generally Do Not Qualify for Reduced Tax Rates. In general, the maximum U.S. federal income tax rate for dividends paid to individual U.S. stockholders is 20%. Unlike dividends received from a corporation that is not a REIT, our distributions to individual stockholders generally are not eligible for the reduced rates.

UDR May Conduct a Portion of Our Business Through Taxable REIT Subsidiaries, Which are Subject to Certain Tax Risks. We have established several taxable REIT subsidiaries. Despite UDR’s qualification as a REIT, its taxable REIT subsidiaries must pay income tax on their taxable income. In addition, we must comply with various tests to continue to qualify as a REIT for federal income tax purposes, and our income from and investments in our taxable REIT subsidiaries generally do not constitute permissible income and investments for these tests. While we will attempt to ensure that our dealings with our taxable REIT subsidiaries will not adversely affect our REIT qualification, we cannot provide assurance that we will successfully achieve that result. Furthermore, we may be subject to a 100% penalty tax, we may jeopardize our ability to retain future gains on real property sales, or our taxable REIT subsidiaries may be denied deductions, to the extent our dealings with our taxable REIT subsidiaries are not deemed to be arm’s length in nature or are otherwise not respected.

REIT Distribution Requirements Limit Our Available Cash. As a REIT, UDR is subject to annual distribution requirements, which limit the amount of cash we retain for other business purposes, including amounts to fund our growth. We generally must distribute annually at least 90% of our net REIT taxable income, excluding any net capital gain, in order for our distributed earnings not to be subject to corporate income tax. We intend to make distributions to UDR’s stockholders to comply with the requirements of the Code. However, differences in timing between the recognition of taxable income and the actual receipt of cash could require us to sell assets or borrow funds on a short-term or long-term basis to meet the 90% distribution requirement of the Code.

Certain Property Transfers May Generate Prohibited Transaction Income, Resulting in a Penalty Tax on Gain Attributable to the Transaction. From time to time, we may transfer or otherwise dispose of some of our properties. Under the Code, any gain resulting from transfers of properties that we hold as inventory or primarily for sale to customers in the ordinary course of business would be treated as income from a prohibited transaction and subject to a 100% penalty tax. Since we acquire properties for investment purposes, we do not believe that our occasional transfers or disposals of property are prohibited transactions. However, whether property is held for investment purposes is a question of fact that depends on all the facts and circumstances surrounding the particular transaction. The Internal Revenue Service may contend that certain transfers or disposals of properties by us are prohibited transactions. If the Internal Revenue Service were to argue successfully that a transfer or disposition of property constituted a prohibited transaction, then we would be required to pay a 100% penalty tax on any gain allocable to us from the prohibited transaction and we may jeopardize our ability to retain future gains on real property

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sales. In addition, income from a prohibited transaction might adversely affect UDR’s ability to satisfy the income tests for qualification as a REIT for federal income tax purposes.

Changes to the U.S. Federal Income Tax Laws, including the Enactment of Certain Proposed Tax Reform Measures, Could Have an Adverse Impact on Our Business and Financial Results. Changes to the U.S. federal income tax laws are proposed regularly. Legislative and regulatory changes may be more likely in the 115^th Congress because the Presidency and such Congress will be controlled by the same political party and significant reform of the Code has been described publicly as a legislative priority.  Additionally, the REIT rules are constantly under review by persons involved in the legislative process and by the Internal Revenue Service and the U.S. Treasury Department, which may result in revisions to regulations and interpretations in addition to statutory changes.  If enacted, certain of such changes could have an adverse impact on our business and financial results.  For example, certain proposals set forth in President Trump’s administration and House Republican tax plans could reduce the relative competitive advantage of operating as a REIT unless accompanied by responsive changes to the REIT rules.  These proposals include: the lowering of income tax rates on individuals and corporations, which could ease the burden of double taxation on corporate dividends and make the single level of taxation on REIT distributions relatively less attractive; allowing the expensing of capital expenditures, which could result in the bunching of taxable income and required distributions for REITs; and further limiting or eliminating the deductibility of interest expense, which could disrupt the real estate market and could increase the amount of REIT taxable income that must be distributed as dividends to shareholders. 

We cannot predict whether, when or to what extent new U.S. federal tax laws, regulations, interpretations or rulings will be issued, nor is the long-term impact of proposed tax reforms on the real estate investment industry or REITs clear.  Prospective investors are urged to consult their tax advisors regarding the effect of potential changes to the U.S. federal tax laws on an investment in our shares.

We May Be Adversely Affected by Changes in State and Local Tax Laws and May Become Subject to Tax Audits from Time to Time. As discussed in the risk factors above, because UDR is organized and qualifies as a REIT, it is generally not subject to federal income taxes, but it is subject to certain state and local taxes. From time to time, changes in state and local tax laws or regulations are enacted, which may result in an increase in our tax liability. A shortfall in tax revenues for states and municipalities in which we own apartment communities may lead to an increase in the frequency and size of such changes. If such changes occur, we may be required to pay additional state and local taxes. These increased tax costs could adversely affect our financial condition and the amount of cash available for the payment of distributions to UDR’s stockholders. In the normal course of business, we or our affiliates (including entities through which we own real estate) may also become subject to federal, state or local tax audits. If we (or such entities) become subject to federal, state or local tax audits, the ultimate result of such audits could have an adverse effect on our financial condition.

The Operating Partnership and the DownREIT Partnership Intend to Qualify as Partnerships, But Cannot Guarantee That They Will Qualify. The Operating Partnership and the DownREIT Partnership intend to qualify as partnerships for federal income tax purposes, and intend to take that position for all income tax reporting purposes. If classified as partnerships, the Operating Partnership and the DownREIT Partnership generally will not be taxable entities and will not incur federal income tax liability. However, the Operating Partnership and the DownREIT Partnership would be treated as corporations for federal income tax purposes if they were “publicly traded partnerships,” unless at least 90% of their income was qualifying income as defined in the Code. A “publicly traded partnership” is a partnership whose partnership interests are traded on an established securities market or are readily tradable on a secondary market (or the substantial equivalent thereof). Although neither the Operating Partnership’s nor the DownREIT Partnership’s partnership units are traded on an established securities market, because of the redemption rights of their limited partners, the Operating Partnership’s and DownREIT Partnership’s units held by limited partners could be viewed as readily tradable on a secondary market (or the substantial equivalent thereof), and the Operating Partnership and the DownREIT Partnership may not qualify for one of the “safe harbors” under the applicable tax regulations. Qualifying income for the 90% test generally includes passive income, such as real property rents, dividends and interest. The income requirements applicable to REITs and the definition of qualifying income for purposes of this 90% test are similar in most respects. The Operating Partnership and the DownREIT Partnership may not meet this qualifying income test. If the Operating Partnership or the DownREIT Partnership were to be taxed as a corporation, they would incur substantial tax liabilities, and UDR would then fail to qualify as a REIT for tax purposes, unless it qualified for relief under certain statutory savings provisions, and our ability to raise additional capital would be impaired.

Qualifying as a REIT Involves Highly Technical and Complex Provisions of the Code. Our qualification as a REIT involves the application of highly technical and complex Code provisions for which only limited judicial and administrative authorities exist. Even a technical or inadvertent violation could jeopardize our REIT qualification. Moreover, new legislation,

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court decisions or administrative guidance, in each case possibly with retroactive effect, may make it more difficult or impossible for us to qualify as a REIT. Our qualification as a REIT will depend on our satisfaction of certain asset, income, organizational, distribution, shareholder ownership and other requirements on a continuing basis. Our ability to satisfy the REIT income and asset tests depends upon our analysis of the characterization and fair market values of our assets, some of which are not susceptible to a precise determination and for which we will not obtain independent appraisals, and upon our ability to successfully manage the composition of our income and assets on an ongoing basis. In addition, our ability to satisfy the requirements to qualify as a REIT depends in part on the actions of third parties over which we have no control or only limited influence, including in cases where we own an equity interest in an entity that is classified as a partnership for U.S. federal income tax purposes.

Risks Related to Our Organization and Ownership of UDR’s Stock

Changes in Market Conditions and Volatility of Stock Prices Could Adversely Affect the Market Price of UDR’s Common Stock. The stock markets, including the New York Stock Exchange (“NYSE”), on which we list UDR’s common stock, have experienced significant price and volume fluctuations. As a result, the market price of UDR’s common stock could be similarly volatile, and investors in UDR’s common stock may experience a decrease in the value of their shares, including decreases unrelated to our operating performance or prospects. In addition to the risks listed in this “Risk Factors” section, a number of factors could negatively affect the price per share of UDR’s common stock, including:

• general market and economic conditions;

• actual or anticipated variations in UDR’s quarterly operating results or dividends or UDR’s payment of dividends in shares of UDR’s stock;

• changes in our funds from operations or earnings estimates;

• difficulties or inability to access capital or extend or refinance existing debt;

• decreasing (or uncertainty in) real estate valuations;

• changes in market valuations of similar companies;

• publication of research reports about us or the real estate industry;

• the general reputation of real estate investment trusts and the attractiveness of their equity securities in comparison to other equity securities (including securities issued by other real estate companies);

• general stock and bond market conditions, including changes in interest rates on fixed income securities, that may lead prospective purchasers of UDR’s stock to demand a higher annual yield from future dividends;

• a change in analyst ratings;

• additions or departures of key management personnel;

• adverse market reaction to any additional debt we incur in the future;

• speculation in the press or investment community;

• terrorist activity which may adversely affect the markets in which UDR’s securities trade, possibly increasing market volatility and causing the further erosion of business and consumer confidence and spending;

• failure to qualify as a REIT;

• strategic decisions by us or by our competitors, such as acquisitions, divestments, spin-offs, joint ventures, strategic investments or changes in business strategy;

• failure to satisfy listing requirements of the NYSE;

• governmental regulatory action and changes in tax laws; and

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• the issuance of additional shares of UDR’s common stock, or the perception that such sales might occur, including under UDR’s at-the-market equity distribution program.

Many of the factors listed above are beyond our control. These factors may cause the market price of shares of UDR’s common stock to decline, regardless of our financial condition, results of operations, business or our prospects.

We May Change the Dividend Policy for UDR’s Common Stock in the Future. The decision to declare and pay dividends on UDR’s common stock, as well as the timing, amount and composition of any such future dividends, will be at the sole discretion of our board of directors and will depend on our earnings, funds from operations, liquidity, financial condition, capital requirements, contractual prohibitions or other limitations under our indebtedness, the annual distribution requirements under the REIT provisions of the Code, state law and such other factors as our board of directors considers relevant. Any change in our dividend policy could have a material adverse effect on the market price of UDR’s common stock.

Maryland Law May Limit the Ability of a Third Party to Acquire Control of Us, Which May Not be in UDR’s Stockholders’ Best Interests. Maryland business statutes may limit the ability of a third party to acquire control of us. As a Maryland corporation, we are subject to various Maryland laws which may have the effect of discouraging offers to acquire our Company and of increasing the difficulty of consummating any such offers, even if our acquisition would be in UDR’s stockholders’ best interests. The Maryland General Corporation Law restricts mergers and other business combination transactions between us and any person who acquires beneficial ownership of shares of UDR’s stock representing 10% or more of the voting power without our board of directors’ prior approval. Any such business combination transaction could not be completed until five years after the person acquired such voting power, and generally only with the approval of stockholders representing 80% of all votes entitled to be cast and 66 2/3 % of the votes entitled to be cast, excluding the interested stockholder, or upon payment of a fair price. Maryland law also provides generally that a person who acquires shares of our equity stock that represents 10% (and certain higher levels) of the voting power in electing directors will have no voting rights unless approved by a vote of two-thirds of the shares eligible to vote.

Limitations on Share Ownership and Limitations on the Ability of UDR’s Stockholders to Effect a Change in Control of Our Company Restricts the Transferability of UDR’s Stock and May Prevent Takeovers That are Beneficial to UDR’s Stockholders. One of the requirements for maintenance of our qualification as a REIT for U.S. federal income tax purposes is that no more than 50% in value of our outstanding capital stock may be owned by five or fewer individuals, including entities specified in the Code, during the last half of any taxable year. Our charter contains ownership and transfer restrictions relating to UDR’s stock primarily to assist us in complying with this and other REIT ownership requirements; however, the restrictions may have the effect of preventing a change of control, which does not threaten REIT status. These restrictions include a provision that generally limits ownership by any person of more than 9.9% of the value of our outstanding equity stock, unless our board of directors exempts the person from such ownership limitation, provided that any such exemption shall not allow the person to exceed 13% of the value of our outstanding equity stock. Absent such an exemption from our board of directors, the transfer of UDR’s stock to any person in excess of the applicable ownership limit, or any transfer of shares of such stock in violation of the ownership requirements of the Code for REITs, will be considered null and void, and the intended transferee of such stock will acquire no rights in such shares. These provisions of our charter may have the effect of delaying, deferring or preventing someone from taking control of us, even though a change of control might involve a premium price for UDR’s stockholders or might otherwise be in UDR’s stockholders’ best interests.

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

Unregistered Sales of Equity Securities

From time to time the Company issues shares of the Company’s common stock in exchange for operating partnership units (“OP Units”) tendered to the Operating Partnership for redemption in accordance with the provisions of the Operating Partnership’s limited partnership agreement. The holders of OP Units have the right to require the Operating Partnership to redeem all or a portion of their OP Units in exchange for a cash payment based on the market value of our common stock at the time of redemption. However, the Operating Partnership’s obligation to pay the cash amount is subject to the prior right of the Company to acquire such OP Units in exchange for either the cash amount or the number of shares of the Company’s common stock equal to the number of OP Units being redeemed.

During the three months ended March 31, 2017, we did not issue any shares of our common stock upon redemption of OP Units.

Repurchase of Equity Securities

In February 2006, UDR’s Board of Directors authorized a 10 million share repurchase program. In January 2008, our Board of Directors authorized a new 15 million share repurchase program. Under the two share repurchase programs, UDR may repurchase shares of our common stock in open market purchases, block purchases, privately negotiated transactions or otherwise. As reflected in the table below, no shares of common stock were repurchased under these programs during the quarter ended March 31, 2017.

Period	Total Number of Shares Purchased	Weighted Average Price per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Number of Shares that May Yet Be Purchased Under the Plans or Programs (a)
Beginning Balance	9,967,490	$	22.00	9,967,490	15,032,510
January 1, 2017 through January 31, 2017	—	—		—	15,032,510
February 1, 2017 through February 28, 2017	—	—		—	15,032,510
March 1, 2017 through March 31, 2017	—	—		—	15,032,510
Balance as of March 31, 2017	9,967,490	$	22.00	9,967,490	15,032,510

(a) This number reflects the amount of shares that were available for purchase under our 10 million share repurchase program authorized in February 2006 and our 15 million share repurchase program authorized in January 2008.

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During the three months ended March 31, 2017, certain of our employees surrendered shares of common stock owned by them to satisfy their statutory minimum federal and state tax obligations associated with the vesting of restricted shares of common stock issued under our 1999 Long-Term Incentive Plan (the “LTIP”). The following table summarizes all of these repurchases during the three months ended March 31, 2017.

Period	Total Number of Shares Purchased	Average Price Paid per Share (a)		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Number of Shares that May Yet Be Purchased Under the Plans or Programs
January 1, 2017 through January 31, 2017	21,732	$	35.95	N/A	N/A
February 1, 2017 through February 28, 2017	94,145	34.84		N/A	N/A
March 1, 2017 through March 31, 2017	—	—		N/A	N/A
Total	115,877	$	35.05

(a) The price paid per share is based on the closing price of our common stock as of the date of the determination of the statutory minimum for federal and state tax obligations.

Item 3.        DEFAULTS UPON SENIOR SECURITIES

None.

Item 4.        MINE SAFETY DISCLOSURES

Not applicable.

Item 5.        OTHER INFORMATION

None.

Item 6.        EXHIBITS

The exhibits filed or furnished with this Report are set forth in the Exhibit Index.

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SIGNATURES

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

		UDR, Inc.
Date:	April 25, 2017	/s/ Joseph D. Fisher
		Joseph D. Fisher
		Senior Vice President and Chief Financial Officer (Principal Financial Officer)
		United Dominion Realty, L.P.
		By:	UDR, Inc., its general partner
Date:	April 25, 2017	/s/ Joseph D. Fisher
		Joseph D. Fisher
		Senior Vice President and Chief Financial Officer (Principal Financial Officer)

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EXHIBIT INDEX

Exhibit No.	Description
3.1	Articles of Restatement of UDR, Inc. (incorporated by reference to Exhibit 3.09 to UDR, Inc.’s Current Report on Form 8-K dated July 27, 2005 and filed with the SEC on August 1, 2005).
3.2	Articles of Amendment to the Articles of Restatement of UDR, Inc. dated and filed with the State Department of Assessments and Taxation of the State of Maryland on March 14, 2007 (incorporated by reference to Exhibit 3.2 to UDR, Inc.’s Current Report on Form 8-K dated March 14, 2007 and filed with the SEC on March 15, 2007).
3.3	Articles of Amendment to the Articles of Restatement of UDR, Inc. dated August 30, 2011 and filed with the State Department of Assessments and Taxation of the State of Maryland on August 31, 2011 (incorporated by reference to Exhibit 3.1 to UDR, Inc.’s Current Report on Form 8-K dated August 29, 2011 and filed with the SEC on September 1, 2011).
3.4	Articles Supplementary relating to UDR, Inc.’s 6.75% Series G Cumulative Redeemable Preferred Stock dated and filed with the State Department of Assessments and Taxation of the State of Maryland on May 30, 2007 (incorporated by reference to Exhibit 3.4 to UDR, Inc.’s Form 8-A Registration Statement dated and filed with the SEC on May 30, 2007).
3.5	Certificate of Limited Partnership of United Dominion Realty, L.P. dated February 19, 2004 (incorporated by reference to Exhibit 3.4 to United Dominion Realty, L.P.’s Post-Effective Amendment No. 1 to Registration Statement on Form S-3 dated and filed with the SEC on October 15, 2010).
3.6	Amended and Restated Agreement of Limited Partnership of United Dominion Realty, L.P. dated as of February 23, 2004 (incorporated by reference to Exhibit 10.23 to UDR, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2003).
3.7	First Amendment to the Amended and Restated Agreement of Limited Partnership of United Dominion Realty, L.P. dated June 24, 2005 (incorporated by reference to Exhibit 10.06 to UDR, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2005).
3.8	Second Amendment to the Amended and Restated Agreement of Limited Partnership of United Dominion Realty, L.P. dated February 23, 2006 (incorporated by reference to Exhibit 10.6 to UDR, Inc.’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2006).
3.9	Third Amendment to the Amended and Restated Agreement of Limited Partnership of United Dominion Realty, L.P. dated February 2, 2007 (incorporated by reference to Exhibit 99.1 to UDR, Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2009).
3.1	Fourth Amendment to the Amended and Restated Agreement of Limited Partnership of United Dominion Realty, L.P. dated December 27, 2007 (incorporated by reference to Exhibit 10.25 to UDR, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2007).
3.11	Fifth Amendment to the Amended and Restated Agreement of Limited Partnership of United Dominion Realty, L.P. dated March 7, 2008 (incorporated by reference to Exhibit 10.53 to UDR, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2008).
3.12	Sixth Amendment to the Amended and Restated Agreement of Limited Partnership of United Dominion Realty, L.P. dated December 9, 2008 (incorporated by reference to Exhibit 10.1 to UDR, Inc.’s Current Report on Form 8-K dated December 9, 2008 and filed with the Commission on December 10, 2008).

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Exhibit No.	Description
3.13	Seventh Amendment to the Amended and Restated Agreement of Limited Partnership of United Dominion Realty, L.P., dated as of March 13, 2009 (incorporated by reference to Exhibit 10.1 to UDR, Inc.’s Current Report on Form 8-K dated March 18, 2009 and filed with the SEC on March 19, 2009).
3.14	Eighth Amendment to the Amended and Restated Agreement of Limited Partnership of United Dominion Realty, L.P., dated as of November 17, 2010 (incorporated by reference to Exhibit 10.1 to UDR, Inc.’s Current Report on Form 8-K dated November 18, 2010 and filed with the SEC on November 18, 2010).
3.15	Ninth Amendment to the Amended and Restated Agreement of Limited Partnership of United Dominion Realty, L.P., dated as of December 4, 2015 (incorporated by reference to Exhibit 10.1 to UDR, Inc.’s Current Report on Form 8-K dated December 4, 2015 and filed with the SEC on December 10, 2015).
3.16	Amended and Restated Bylaws of UDR, Inc. (as amended through May 12, 2016) (incorporated by reference to Exhibit 3.1 to UDR, Inc.’s Current Report on Form 8-K dated May 12, 2016 and filed with the SEC on May 18, 2016).
10.1*	UDR, Inc. 1999 Long-Term Incentive Plan (as amended and restated February 2, 2017) (incorporated by reference to Exhibit 10.1 to UDR, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2016).
10.2*	Form of UDR, Inc. Restricted Stock Award Agreement under the 1999 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.2 to UDR, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2016).
10.3*	Indemnification Agreement by and between UDR, Inc. and each of its directors and officers listed on Schedule A thereto (incorporated by reference to Exhibit 10.7 to UDR, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2016).
10.4	First Amendment, dated January 20, 2017, to the Credit Agreement, dated as of October 20, 2015, by and among UDR, Inc., as borrower, and the lenders and agents party thereto (incorporated by reference to Exhibit 10.24 to UDR, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2016).
12.1	Computation of Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends of UDR, Inc.
12.2	Computation of Ratio of Earnings to Fixed Charges of United Dominion Realty, L.P.
31.1	Rule 13a-14(a) Certification of the Chief Executive Officer of UDR, Inc.
31.2	Rule 13a-14(a) Certification of the Chief Financial Officer of UDR, Inc.
31.3	Rule 13a-14(a) Certification of the Chief Executive Officer of UDR Inc., general partner of United Dominion Realty, L.P.
31.4	Rule 13a-14(a) Certification of the Chief Financial Officer of UDR Inc., general partner of United Dominion Realty, L.P.
32.1	Section 1350 Certification of the Chief Executive Officer of UDR, Inc.
32.2	Section 1350 Certification of the Chief Financial Officer of UDR, Inc.

99

Exhibit No.	Description
32.3	Section 1350 Certification of the Chief Executive Officer of UDR Inc., general partner of United Dominion Realty, L.P.
32.4	Section 1350 Certification of the Chief Financial Officer of UDR Inc., general partner of United Dominion Realty, L.P.
101	XBRL (Extensible Business Reporting Language). The following materials from this Quarterly Report on Form 10-Q for the periods ended March 31, 2017, formatted in XBRL: (i) consolidated balance sheets of UDR, Inc., (ii) consolidated statements of operations of UDR, Inc., (iii) consolidated statements of comprehensive income/(loss) of UDR, Inc., (iv) consolidated statements of changes in equity of UDR, Inc., (v) consolidated statements of cash flows of UDR, Inc., (vi) notes to consolidated financial statements of UDR, Inc., (vii) consolidated balance sheets of United Dominion Realty, L.P., (viii) consolidated statements of operations of United Dominion Realty, L.P., (ix) consolidated statements of comprehensive income/(loss) of United Dominion Realty, L.P., (x) consolidated statements of changes in capital of United Dominion Realty, L.P., (xi) consolidated statements of cash flows of United Dominion Realty, L.P., and (xii) notes to consolidated financial statements of United Dominion Realty, L.P.
* Management Contract or Compensatory Plan or Arrangement

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EX-12.1

EXHIBIT 12.1

UDR, Inc.

Computation of Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends

(Dollars in thousands)

	Three Months Ended
	March 31,
	2017		2016
Earnings:
Income/(loss) from continuing operations	$	26,264	$	8,534
Add (from continuing operations):
Interest on indebtedness (a)	30,539		31,104
Portion of rents representative of the interest factor	484		483
Amortization of capitalized interest	1,194		1,052
Total earnings	$	58,481	$	41,173
Fixed charges and preferred stock dividends (from continuing operations):
Interest on indebtedness (a)	$	30,539	$	31,104
Interest capitalized	4,706		4,203
Portion of rents representative of the interest factor	484		483
Fixed charges	$	35,729	$	35,790
Add:
Preferred stock dividends	929		929
Combined fixed charges and preferred stock dividends	$	36,658	$	36,719
Ratio of earnings to fixed charges	1.64		1.15
Ratio of earnings to combined fixed charges and preferred stock dividends	1.60		1.12

(a) Includes interest expense of consolidated subsidiaries, amortization of deferred loan costs, realized losses related to hedging activities and amortization of premiums and discounts related to indebtedness.

EX-12.2

EXHIBIT 12.2

United Dominion Realty, L.P.

Computation of Ratio of Earnings to Fixed Charges

(Dollars in thousands)

	Three Months Ended
	March 31,
	2017		2016
Earnings:
Income/(loss) from continuing operations	$	14,007	$	5,131
Add from continuing operations:
Interest on indebtedness (a)	8,611		7,605
Portion of rents representative of the interest factor	462		453
Amortization of capitalized interest	186		176
Total earnings	$	23,266	$	13,365
Fixed charges from continuing operations:
Interest on indebtedness (a)	$	8,611	$	7,605
Interest capitalized	3		124
Portion of rents representative of the interest factor	462		453
Fixed charges	$	9,076	$	8,182
Ratio of earnings to fixed charges	2.56		1.63

(a) Includes interest expense of consolidated subsidiaries, amortization of deferred loan costs, realized losses related to hedging activities and amortization of premiums and discounts related to indebtedness.

EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, Thomas W. Toomey, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of UDR, Inc.;

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

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

4. The registrant’s other certifying officer(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 control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

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

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

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

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

5. The registrant’s other certifying officer(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 directors (or persons performing the equivalent functions):

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

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

Date:	April 25, 2017	/s/ Thomas W. Toomey
		Thomas W. Toomey
		Chief Executive Officer and President (Principal Executive Officer)

EX-31.2

EXHIBIT 31.2

CERTIFICATION

I, Joseph D. Fisher, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of UDR, Inc.;

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

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

4. The registrant’s other certifying officer(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 control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

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

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

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

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

5. The registrant’s other certifying officer(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 directors (or persons performing the equivalent functions):

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

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

Date:	April 25, 2017	/s/ Joseph D. Fisher
		Joseph D. Fisher
		Chief Financial Officer and Senior Vice President (Principal Financial Officer)

EX-31.3

EXHIBIT 31.3

CERTIFICATION

I, Thomas W. Toomey, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of United Dominion Realty, L.P.;

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 control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

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

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

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

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

5. The registrant’s other certifying officer(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 directors (or persons performing the equivalent functions):

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

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

Date:	April 25, 2017	/s/ Thomas W. Toomey
		Thomas W. Toomey
		Chief Executive Officer and President (Principal Executive Officer) of UDR, Inc.,
		general partner of United Dominion Realty, L.P.

EX-31.4

EXHIBIT 31.4

CERTIFICATION

I, Joseph D. Fisher, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of United Dominion Realty, L.P.;

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 control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

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

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

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

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

5. The registrant’s other certifying officer(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 directors (or persons performing the equivalent functions):

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

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

Date:	April 25, 2017	/s/ Joseph D. Fisher
		Joseph D. Fisher
		Chief Financial Officer and Senior Vice President (Principal Financial Officer) of UDR, Inc.,
		general partner of United Dominion Realty, L.P.

EX-32.1

EXHIBIT 32.1

CERTIFICATION

In connection with the periodic report of UDR, Inc. (the “Company”) on Form 10-Q for the quarter ended March 31, 2017, as filed with the Securities and Exchange Commission (the “Report”), I, Thomas W. Toomey, Chief Executive Officer and President of the Company, hereby certify as of the date hereof, solely for purposes of Title 18, Chapter 63, Section 1350 of the United States Code, that to the best of my knowledge:

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

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

Date:	April 25, 2017	/s/ Thomas W. Toomey
		Thomas W. Toomey
		Chief Executive Officer and President (Principal Executive Officer)

EX-32.2

EXHIBIT 32.2

CERTIFICATION

In connection with the periodic report of UDR, Inc. (the “Company”) on Form 10-Q for the quarter ended March 31, 2017, as filed with the Securities and Exchange Commission (the “Report”), I, Joseph D. Fisher, Senior Vice President and Chief Financial Officer of the Company, hereby certify as of the date hereof, solely for purposes of Title 18, Chapter 63, Section 1350 of the United States Code, that to the best of my knowledge:

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

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

Date:	April 25, 2017	/s/ Joseph D. Fisher
		Joseph D. Fisher
		Chief Financial Officer and Senior Vice President (Principal Financial Officer)

EX-32.3

EXHIBIT 32.3

CERTIFICATION

In connection with the periodic report of United Dominion Realty, L.P. (the “Operating Partnership”) on Form 10-Q for the quarter ended March 31, 2017, as filed with the Securities and Exchange Commission (the “Report”), I, Thomas W. Toomey, Chief Executive Officer and President of UDR, Inc., the general partner of the Operating Partnership, hereby certify as of the date hereof, solely for purposes of Title 18, Chapter 63, Section 1350 of the United States Code, that to the best of my knowledge:

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

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Operating Partnership at the dates and for the periods indicated.

Date:	April 25, 2017	/s/ Thomas W. Toomey
		Thomas W. Toomey
		Chief Executive Officer and President (Principal Executive Officer) of UDR, Inc.,
		general partner of United Dominion Realty, L.P.

EX-32.4

EXHIBIT 32.4

CERTIFICATION

In connection with the periodic report of United Dominion Realty, L.P. (the “Operating Partnership”) on Form 10-Q for the quarter ended March 31, 2017, as filed with the Securities and Exchange Commission (the “Report”), I, Joseph D. Fisher, Senior Vice President and Chief Financial Officer of UDR, Inc., the general partner of the Operating Partnership, hereby certify as of the date hereof, solely for purposes of Title 18, Chapter 63, Section 1350 of the United States Code, that to the best of my knowledge:

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

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Operating Partnership at the dates and for the periods indicated.

Date:	April 25, 2017	/s/ Joseph D. Fisher
		Joseph D. Fisher
		Chief Financial Officer and Senior Vice President (Principal Financial Officer) of UDR, Inc.,
		general partner of United Dominion Realty, L.P.

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 21, 2017
Entity Registrant Name	UDR, Inc.
Entity Central Index Key	0000074208
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		267,391,715
United Dominion Reality L.P. [Member]
Entity Registrant Name	United Dominion Realty L.P.
Entity Central Index Key	0001018254
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		0

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Real estate owned:
Real estate held for investment	$ 9,393,732	$ 9,271,847
Less: accumulated depreciation	(3,026,660)	(2,923,072)
Real estate held for investment, net	6,367,072	6,348,775
Real estate under development (net of accumulated depreciation of $0 and $0, respectively)	393,837	342,282
Real estate held for disposition (net of accumulated depreciation of $0 and $533, respectively)	0	1,071
Total real estate owned, net of accumulated depreciation	6,760,909	6,692,128
Cash and cash equivalents	2,460	2,112
Restricted cash	19,757	19,994
Notes receivable, net	19,790	19,790
Investments in and advances to unconsolidated joint ventures, net	818,990	827,025
Other assets	114,005	118,535
Total assets	7,735,911	7,679,584
Liabilities:
Secured debt, net	1,031,507	1,130,858
Unsecured debt, net	2,505,785	2,270,620
Real estate taxes payable	23,105	17,388
Accrued interest payable	27,887	29,257
Security deposits and prepaid rent	36,894	34,238
Distributions payable	91,436	86,936
Accounts payable, accrued expenses, and other liabilities	74,608	103,835
Total liabilities	3,791,222	3,673,132
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	904,778	909,482
Equity:
Common stock, $0.01 par value; 350,000,000 shares authorized; 267,398,819 and 267,259,469 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	2,674	2,673
Additional Paid in Capital	4,635,942	4,635,413
Distributions in excess of net income	(1,644,621)	(1,585,825)
Accumulated other comprehensive income/(loss), net	(4,288)	(5,609)
Total stockholders' equity	3,036,165	3,093,110
Noncontrolling interests	3,746	3,860
Total equity	3,039,911	3,096,970
Total liabilities and equity	7,735,911	7,679,584
Series E Preferred Stock [Member]
Equity:
Preferred stock, no par value; 50,000,000 shares authorized	46,457	46,457
Series F Preferred Stock [Member]
Equity:
Preferred stock, no par value; 50,000,000 shares authorized	$ 1	$ 1

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Real estate owned:
Real estate under development accumulated depreciation	$ 0	$ 0
Real estate held for disposition accumulated depreciation	$ 0	$ 553
Equity:
Preferred stock, shares authorized	50,000,000	50,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	350,000,000	350,000,000
Common stock, shares issued	267,398,819	267,259,469
Common stock, shares outstanding	267,398,819	267,259,469
Series F Preferred Stock [Member]
Equity:
Preferred stock, shares issued	16,155,807	16,196,889
Preferred stock, shares outstanding	16,155,807	16,196,889
Series E Preferred Stock [Member]
Equity:
Preferred Stock, Dividend Rate, Percentage	8.00%	8.00%
Preferred stock, shares issued	2,796,903	2,796,903
Preferred stock, shares outstanding	2,796,903	2,796,903

XML

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
REVENUES
Rental income	$ 241,271	$ 231,957
Joint venture management and other fees	2,570	2,858
Total revenues	243,841	234,815
OPERATING EXPENSES
Property operating and maintenance	39,600	39,446
Real estate taxes and insurance	30,188	28,377
Property management	6,635	6,379
Other operating expenses	1,691	1,752
Real estate depreciation and amortization	105,032	105,339
General and administrative	13,075	13,844
Casualty-related (recoveries)/charges, net	502	0
Other depreciation and amortization	1,608	1,553
Total operating expenses	198,331	196,690
Operating income	45,510	38,125
Income/(loss) from unconsolidated entities	11,198	679
Interest expense	(30,539)	(31,104)
Interest income and other income/(expense), net	427	431
Income/(loss) before income taxes and gain/(loss) on sale of real estate owned	26,596	8,131
Income/(loss) from continuing operations	26,264	8,534
Gain/(loss) on sale of real estate owned, net of tax	2,132	3,070
Net income/(loss)	28,396	11,604
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(2,338)	(905)
Net (income)/loss attributable to noncontrolling interests	(91)	(306)
Net income/(loss) attributable to UDR, Inc.	25,967	10,393
Distributions to preferred stockholders - Series E (Convertible)	(929)	(929)
Net income/(loss) attributable to common stockholders	$ 25,038	$ 9,464
Common distributions declared per share	$ 0.310	$ 0.295
Income/(loss) per weighted average common share - basic	0.09	0.04
Income/(loss) per weighted average common share - diluted	$ 0.09	$ 0.04
Weighted average number of common shares outstanding — basic	266,790	262,456
Weighted average number of common shares outstanding — diluted	268,688	264,285
Continuing Operations [Member]
OPERATING EXPENSES
Tax (provision)/benefit, net	$ 332	$ (403)

XML

Consolidated Statements of Comprehensive Income / (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net income/(loss)	$ 28,396	$ 11,604
Other comprehensive income/(loss), including portion attributable to noncontrolling interests:
Unrealized holding gain/(loss)	632	(811)
(Gain)/loss reclassified into earnings from other comprehensive income/(loss)	818	935
Other comprehensive income/(loss), including portion attributable to noncontrolling interests	1,450	124
Comprehensive income/(loss)	29,846	11,728
Comprehensive (income)/loss attributable to noncontrolling interests	(2,558)	(692)
Comprehensive income/(loss) attributable to UDR, Inc.	$ 27,288	$ 11,036

XML

Consolidated Statements of Changes in Equity (Unaudited) - 3 months ended Mar. 31, 2017 - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Paid - in Capital [Member]	Distributions in Excess of Net Income [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2016	$ 3,096,970	$ 46,458	$ 2,673	$ 4,635,413	$ (1,585,825)	$ (5,609)	$ 3,860
Consolidted Statements of Changes in Equity
Net income/(loss) attributable to UDR, Inc.	25,967				25,967		0
Net income/(loss) attributable to noncontrolling interests	101					0	101
Contribution of noncontrolling interest in consolidated real estate	125						125
Long Term Incentive Plan Unit grants/(vesting), net	(340)						(340)
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership and DownREIT Partnership	1,850		0	1,850
Other comprehensive income/(loss)	1,321		0	0		1,321
Issuance/(forfeitures) of common and restricted shares, net	(1,878)		1	(1,879)
Common stock distributions declared ($0.310 per share)	(82,995)				(82,995)		0
Preferred stock distributions declared-Series E ($0.3322 per share)	(929)				(929)
Adjustment to reflect redemption value of redeemable noncontrolling interests	(281)				(281)
Ending Balance at Mar. 31, 2017	3,039,911	$ 46,458	$ 2,674	4,635,942	(1,644,621)	$ (4,288)	$ 3,746
Consolidted Statements of Changes in Equity
Cumulative effect upon adoption of ASU 2016-09 | Accounting Standards Update 2016-09 [Member]	$ 0			$ 558	$ (558)

XML

Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical)	3 Months Ended
	Mar. 31, 2017 $ / shares
Common distributions declared per share	$ 0.310
Series E Preferred Stock [Member]
Preferred stock distributions declared	$ 0.3322

XML

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Activities
Net income/(loss)	$ 28,396	$ 11,604
Adjustments to reconcile net income/(loss) to net cash provided by/(used in) operating activities:
Depreciation and amortization	106,640	106,892
Gain/(loss) on sale of real estate owned, net of tax	(2,132)	(3,070)
(Income)/loss from unconsolidated entities	(11,198)	(679)
Return on investment in unconsolidated joint ventures	1,455	272
Amortization of share-base compensation	3,379	3,879
Other	4,264	2,497
Changes in operating assets and liabilities:
(Increase)/decrease in operating assets	3,856	(1,853)
Increase/(decrease) in operating liabilities	(14,528)	(6,378)
Net cash provided by/(used in) operating activities	120,464	112,761
Investing Activities
Acquisition of real estate assets	(65,381)	0
Proceeds from sale of real estate investments, net	3,250	21,951
Development of real estate assets	(63,022)	(36,045)
Capital expenditures and other major improvements - real estate assets, net of escrow reimbursement	(21,921)	(24,917)
Capital expenditures - non-real estate assets	(1,233)	(664)
Investment in unconsolidated joint ventures	(24,193)	(13,262)
Distributions received from unconsolidated joint venture	9,711	7,711
Net cash provided by/(used in) investing activities	(162,789)	(45,226)
Financing Activities
Payments on secured debt	(99,463)	(2,205)
Payments on unsecured debt	0	(83,373)
Proceeds from the issuance of unsecured debt	220,000	0
Net proceeds/(repayment) of revolving bank debt	14,790	(73,652)
Proceeds from the issuance of common shares through public offering, net	0	173,300
Distributions paid to redeemable noncontrolling interests	(7,476)	(7,085)
Distributions paid to preferred stockholders	(925)	(924)
Distributions paid to common stockholders	(78,942)	(72,704)
Other	(5,311)	(3,966)
Net cash provided by/(used in) financing activities	42,673	(70,609)
Net increase/(decrease) in cash and cash equivalents	348	(3,074)
Cash and cash equivalents, beginning of period	2,112	6,742
Cash and cash equivalents, end of period	2,460	3,668
Supplemental Information:
Interest paid during the period, net of amounts capitalized	32,463	31,918
Cash paid/(refunds received) for income taxes	171	267
Non-cash transactions:
Transfer of investment in and advances to unconsolidated joint ventures to real estate owned	32,260	0
Development costs and capital expenditures incurred but not yet paid	34,336	21,220
Conversion of Operating Partnership and DownREIT Partnership noncontrolling interests to common stock (50,689 shares in 2017 and 0 shares in 2016)	1,850	0
Dividends declared but not yet paid	91,436	86,963
Continuing Operations [Member]
Adjustments to reconcile net income/(loss) to net cash provided by/(used in) operating activities:
Tax provision/(benefit), net	(332)	403
2016 LTIP [Member]
Non-cash transactions:
Vesting of LTIP Units	$ 2,317	$ 0

XML

Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Non-cash transactions:
Conversion of OP Units into common shares	50,689	0

XML

Consolidated Balance Sheets (UNITED DOMINION REALTY, L.P) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Real estate owned:
Real estate held for investment	$ 9,393,732	$ 9,271,847
Less: accumulated depreciation	(3,026,660)	(2,923,072)
Real estate held for investment, net	6,367,072	6,348,775
Real estate held for disposition (net of accumulated depreciation of $17,209 and $0, respectively)	0	1,071
Total real estate owned, net of accumulated depreciation	6,760,909	6,692,128
Cash and cash equivalents	2,460	2,112
Restricted cash	19,757	19,994
Investment in unconsolidated entities	818,990	827,025
Other assets	114,005	118,535
Total assets	7,735,911	7,679,584
LIABILITIES AND CAPITAL
Secured debt, net	1,031,507	1,130,858
Real estate taxes payable	23,105	17,388
Accrued interest payable	27,887	29,257
Security deposits and prepaid rent	36,894	34,238
Distributions payable	91,436	86,936
Accounts payable, accrued expenses, and other liabilities	74,608	103,835
Total liabilities	3,791,222	3,673,132
Partners' Capital:
Accumulated other comprehensive income/(loss), net	(4,288)	(5,609)
Total liabilities and equity	7,735,911	7,679,584
United Dominion Reality L.P. [Member]
Real estate owned:
Real estate held for investment	3,686,334	3,674,704
Less: accumulated depreciation	(1,445,528)	(1,408,815)
Total real estate owned, net of accumulated depreciation	2,240,806	2,265,889
Cash and cash equivalents	864	756
Restricted cash	12,141	11,694
Investment in unconsolidated entities	103,267	112,867
Other assets	21,475	24,329
Total assets	2,378,553	2,415,535
LIABILITIES AND CAPITAL
Secured debt, net	336,240	433,974
Notes payable due to General Partner	273,334	273,334
Real estate taxes payable	8,409	2,104
Accrued interest payable	1,184	1,410
Security deposits and prepaid rent	15,874	14,593
Distributions payable	57,025	54,192
Accounts payable, accrued expenses, and other liabilities	14,239	17,429
Total liabilities	706,305	797,036
Commitments and contingencies (Note 10)
Partners' Capital:
General partner: 110,883 OP Units outstanding at March 31, 2017 and December 31, 2016	1,000	1,026
Limited partners: 183,240,041 and 183,167,815 OP Units outstanding at March 31, 2017 and December 31, 2016	1,535,939	1,577,289
Accumulated other comprehensive income/(loss), net	(53)	(113)
Total partners' capital	1,536,886	1,578,202
Advances (to)/from General Partner	114,380	19,659
Noncontrolling interests	20,982	20,638
Total capital	1,672,248	1,618,499
Total liabilities and equity	$ 2,378,553	$ 2,415,535

XML

Consolidated Balance Sheets (UNITED DOMINION REALTY, L.P) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Real estate held for disposition accumulated depreciation	$ 0	$ 553
Partners' Capital:
OP units outstanding related to limited partner	183,350,924	183,278,698
United Dominion Reality L.P. [Member]
Partners' Capital:
OP units outstanding related to general partner	110,883	110,883
OP units outstanding related to limited partner	183,240,041	183,167,815

XML

Consolidated Statements of Operations (Unaudited) (UNITED DOMINION REALTY, L.P) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
REVENUES
Rental income	$ 241,271	$ 231,957
OPERATING EXPENSES
Property operating and maintenance	39,600	39,446
Real estate taxes and insurance	30,188	28,377
Property management	6,635	6,379
Other operating expenses	1,691	1,752
Real estate depreciation and amortization	105,032	105,339
General and administrative	13,075	13,844
Casualty-related (recoveries)/charges, net	502	0
Total operating expenses	198,331	196,690
Operating income	45,510	38,125
Income/(loss) from unconsolidated entities	11,198	679
Interest expense	(30,539)	(31,104)
Income/(loss) from continuing operations	26,264	8,534
Gain/(loss) on sale of real estate owned	2,132	3,070
Net income/(loss)	28,396	11,604
Net income/(loss) attributable to OP unitholders	25,967	10,393
United Dominion Reality L.P. [Member]
REVENUES
Rental income	102,605	98,786
OPERATING EXPENSES
Property operating and maintenance	16,518	16,060
Real estate taxes and insurance	11,024	10,174
Property management	2,822	2,717
Other operating expenses	1,548	1,500
Real estate depreciation and amortization	36,879	36,791
General and administrative	5,219	5,421
Casualty-related (recoveries)/charges, net	553	0
Total operating expenses	74,563	72,663
Operating income	28,042	26,123
Income/(loss) from unconsolidated entities	(5,424)	(13,387)
Interest expense	(5,558)	(4,552)
Interest expense on note payable due to General Partner	(3,053)	(3,053)
Net income/(loss)	14,007	5,131
Net (income)/loss attributable to noncontrolling interest	(350)	(344)
Net income/(loss) attributable to OP unitholders	$ 13,657	$ 4,787
Income/(loss) per OP unit- basic and diluted:
Net income/(loss) per weighted average OP unit - basic and diluted	$ 0.07	$ 0.03
Weighted average OP units outstanding - basic and diluted	183,324	183,279

XML

Consolidated Statements of Comprehensive Income / (Loss) (UNITED DOMINION REALTY, L.P.) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net income/(loss)	$ 28,396	$ 11,604
Other comprehensive income/(loss), including portion attributable to noncontrolling interests:
Unrealized holding gain/(loss)	632	(811)
Other comprehensive income/(loss), including portion attributable to noncontrolling interests	1,450	124
Comprehensive income/(loss)	29,846	11,728
Comprehensive income/(loss) attributable to OP unitholders	27,288	11,036
United Dominion Reality L.P. [Member]
Net income/(loss)	14,007	5,131
Other comprehensive income/(loss), including portion attributable to noncontrolling interests:
Unrealized holding gain/(loss)	0	(2)
(Gain)/loss reclassified into earnings from other comprehensive income/(loss)	54	1
Other comprehensive income/(loss), including portion attributable to noncontrolling interests	54	(1)
Comprehensive income/(loss)	14,061	5,130
Comprehensive (income)/loss attributable to noncontrolling interests	(350)	(344)
Comprehensive income/(loss) attributable to OP unitholders	$ 13,711	$ 4,786

XML

Consolidated Statements of Changes in Capital (UNITED DOMINION REALTY, L.P) (Unaudited) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Long Term Incentive Plan Unit grants	$ (340)
United Dominion Reality L.P. [Member]
Balance, December 31, 2016	1,618,499
Net income/(loss)	14,007
Distributions	(57,024)
Adjustment to reflect limited partners' capital at redemption value	0
Long Term Incentive Plan Unit grants	1,991
Unrealized gain/(loss) on derivative financial investments	54
Net change in advances (to)/from General Partner	94,721
Balance, March 31, 2017	1,672,248
Payable/(Receivable) due to/(from) General Partner [Member] [Member] | United Dominion Reality L.P. [Member]
Balance, December 31, 2016	19,659
Net change in advances (to)/from General Partner	94,721
Balance, March 31, 2017	114,380
Accumulated Other Comprehensive Income (Loss) [Member] | United Dominion Reality L.P. [Member]
Balance, December 31, 2016	(113)
Unrealized gain/(loss) on derivative financial investments	60
Balance, March 31, 2017	(53)
Partnership Capital [Member] | United Dominion Reality L.P. [Member]
Balance, December 31, 2016	1,578,202
Net income/(loss)	13,657
Distributions	(57,024)
Adjustment to reflect limited partners' capital at redemption value	0
Long Term Incentive Plan Unit grants	1,991
Unrealized gain/(loss) on derivative financial investments	60
Balance, March 31, 2017	1,536,886
Noncontrolling Interest [Member] | United Dominion Reality L.P. [Member]
Balance, December 31, 2016	20,638
Net income/(loss)	350
Adjustment to reflect limited partners' capital at redemption value	0
Balance, March 31, 2017	20,982
Class A Limited Partner [Member] | United Dominion Reality L.P. [Member]
Balance, December 31, 2016	63,901
Net income/(loss)	130
Distributions	(582)
Adjustment to reflect limited partners' capital at redemption value	67
Balance, March 31, 2017	63,516
Limited Partners [Member] | United Dominion Reality L.P. [Member]
Balance, December 31, 2016	269,928
Net income/(loss)	549
Distributions	(2,428)
Adjustment to reflect limited partners' capital at redemption value	(2,965)
Long Term Incentive Plan Unit grants	1,991
Balance, March 31, 2017	267,075
Limited Partner [Member] | United Dominion Reality L.P. [Member]
Balance, December 31, 2016	1,243,460
Net income/(loss)	12,970
Distributions	(53,980)
Adjustment to reflect limited partners' capital at redemption value	2,898
Balance, March 31, 2017	1,205,348
General Partner [Member] | United Dominion Reality L.P. [Member]
Balance, December 31, 2016	1,026
Net income/(loss)	8
Distributions	(34)
Adjustment to reflect limited partners' capital at redemption value	0
Balance, March 31, 2017	1,000
Noncontrolling Interest [Member]
Long Term Incentive Plan Unit grants	(340)
Noncontrolling Interest [Member] | United Dominion Reality L.P. [Member]
Long Term Incentive Plan Unit grants	0
Unrealized gain/(loss) on derivative financial investments	$ (6)

XML

Consolidated Statements of Cash Flows (UNITED DOMINION REALTY, L.P) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Activities
Net income/(loss)	$ 28,396	$ 11,604
Adjustments to reconcile net income/(loss) to net cash provided by/(used in) operating activities:
Depreciation and amortization	105,032	105,339
Gain/(loss) on sale of real estate owned	2,132	3,070
(Income)/loss from unconsolidated entities	(11,198)	(679)
Other	4,264	2,497
Changes in operating assets and liabilities:
(Increase)/decrease in operating assets	3,856	(1,853)
Increase/(decrease) in operating liabilities	(14,528)	(6,378)
Net cash provided by/(used in) operating activities	120,464	112,761
Investing Activities
Proceeds from sale of real estate investments, net	3,250	21,951
Development of real estate assets	(63,022)	(36,045)
Capital expenditures and other major improvements - real estate assets, net of escrow reimbursement	(21,921)	(24,917)
Distributions received from unconsolidated entities	9,711	7,711
Net cash provided by/(used in) investing activities	(162,789)	(45,226)
Financing Activities
Payments on secured debt	(99,463)	(2,205)
Net cash provided by/(used in) financing activities	42,673	(70,609)
Net increase/(decrease) in cash and cash equivalents	348	(3,074)
Cash and cash equivalents, beginning of period	2,112	6,742
Cash and cash equivalents, end of period	2,460	3,668
Supplemental Information:
Interest paid during the period, net of amounts capitalized	32,463	31,918
Non-cash transactions:
Development costs and capital expenditures incurred but not yet paid	34,336	21,220
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership and DownREIT Partnership	1,850	0
Long Term Incentive Plan Unit grants	(340)
Dividends declared but not yet paid	91,436	86,963
United Dominion Reality L.P. [Member]
Operating Activities
Net income/(loss)	14,007	5,131
Adjustments to reconcile net income/(loss) to net cash provided by/(used in) operating activities:
Depreciation and amortization	36,879	36,791
(Income)/loss from unconsolidated entities	5,424	13,387
Other	1,491	684
Changes in operating assets and liabilities:
(Increase)/decrease in operating assets	1,977	(3,742)
Increase/(decrease) in operating liabilities	4,122	8,274
Net cash provided by/(used in) operating activities	63,900	60,525
Investing Activities
Capital expenditures and other major improvements - real estate assets, net of escrow reimbursement	(12,149)	(10,744)
Distributions received from unconsolidated entities	4,176	3,977
Net cash provided by/(used in) investing activities	(7,973)	(6,767)
Financing Activities
Advances from/(to) General Partner, net	45,088	(53,157)
Payments on secured debt	(98,340)	(275)
Distributions paid to partnership unitholders	(2,567)	(2,327)
Net cash provided by/(used in) financing activities	(55,819)	(55,759)
Net increase/(decrease) in cash and cash equivalents	108	(2,001)
Cash and cash equivalents, beginning of period	756	3,103
Cash and cash equivalents, end of period	864	1,102
Supplemental Information:
Interest paid during the period, net of amounts capitalized	7,066	5,515
Non-cash transactions:
Development costs and capital expenditures incurred but not yet paid	4,816	4,505
Long Term Incentive Plan Unit grants	1,991	663
Dividends declared but not yet paid	$ 57,025	$ 54,173

XML

Consolidation and Basis of Presentation

3 Months Ended

Mar. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

CONSOLIDATION AND BASIS OF PRESENTATION

BASIS OF PRESENTATION

Basis of Presentation

UDR, Inc., collectively with our consolidated subsidiaries (“UDR,” the “Company,” “we,” “our,” or “us”), is a self-administered real estate investment trust, or REIT, that owns, operates, acquires, renovates, develops, redevelops, and manages apartment communities. The accompanying consolidated financial statements include the accounts of UDR and its subsidiaries, including United Dominion Realty, L.P. (the “Operating Partnership” or the “OP”) and UDR Lighthouse DownREIT L.P. (the “DownREIT Partnership”). As of March 31, 2017, there were 183,350,924 units in the Operating Partnership ("OP Units") outstanding, of which 174,233,691 OP Units, or 95.0%, were owned by UDR and 9,117,233 OP Units, or 5.0%, were owned by outside limited partners. As of March 31, 2017, there were 32,367,380 units in the DownREIT Partnership (“DownREIT Units”) outstanding, of which 16,532,096, or 51.1%, were owned by UDR (including 13,470,651 DownREIT Units, or 41.6%, that were held by the Operating Partnership) and 15,835,284, or 48.9%, were owned by outside limited partners. The consolidated financial statements of UDR include the noncontrolling interests of the unitholders in the Operating Partnership and DownREIT Partnership.

The accompanying interim unaudited consolidated financial statements have been prepared according to the rules and regulations of the Securities and Exchange Commission. Certain information and note disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted according to such rules and regulations, although management believes that the disclosures are adequate to make the information presented not misleading. In the opinion of management, all adjustments and eliminations necessary for the fair presentation of our financial position as of March 31, 2017, and results of operations for the three months endedMarch 31, 2017 and 2016 have been included. Such adjustments are normal and recurring in nature. The interim results presented are not necessarily indicative of results that can be expected for a full year. The accompanying interim unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes for the year ended December 31, 2016 appearing in UDR’s Annual Report on Form 10-K, filed with the Securities and Exchange Commission on February 21, 2017.

The accompanying interim unaudited consolidated financial statements are presented in accordance with U.S. generally accepted accounting principles (“GAAP”). GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the dates of the interim unaudited consolidated financial statements and the amounts of revenues and expenses during the reporting periods. Actual amounts realized or paid could differ from those estimates. All significant intercompany accounts and transactions have been eliminated in consolidation.

The Company evaluated subsequent events through the date its financial statements were issued. No significant recognized or non-recognized subsequent events were noted.

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Consolidation and Basis of Presentation (UNITED DOMINION REALTY, L.P.)

3 Months Ended

Mar. 31, 2017

Entity Information [Line Items]

CONSOLIDATION AND BASIS OF PRESENTATION

BASIS OF PRESENTATION

Basis of Presentation

UDR, Inc., collectively with our consolidated subsidiaries (“UDR,” the “Company,” “we,” “our,” or “us”), is a self-administered real estate investment trust, or REIT, that owns, operates, acquires, renovates, develops, redevelops, and manages apartment communities. The accompanying consolidated financial statements include the accounts of UDR and its subsidiaries, including United Dominion Realty, L.P. (the “Operating Partnership” or the “OP”) and UDR Lighthouse DownREIT L.P. (the “DownREIT Partnership”). As of March 31, 2017, there were 183,350,924 units in the Operating Partnership ("OP Units") outstanding, of which 174,233,691 OP Units, or 95.0%, were owned by UDR and 9,117,233 OP Units, or 5.0%, were owned by outside limited partners. As of March 31, 2017, there were 32,367,380 units in the DownREIT Partnership (“DownREIT Units”) outstanding, of which 16,532,096, or 51.1%, were owned by UDR (including 13,470,651 DownREIT Units, or 41.6%, that were held by the Operating Partnership) and 15,835,284, or 48.9%, were owned by outside limited partners. The consolidated financial statements of UDR include the noncontrolling interests of the unitholders in the Operating Partnership and DownREIT Partnership.

The accompanying interim unaudited consolidated financial statements have been prepared according to the rules and regulations of the Securities and Exchange Commission. Certain information and note disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted according to such rules and regulations, although management believes that the disclosures are adequate to make the information presented not misleading. In the opinion of management, all adjustments and eliminations necessary for the fair presentation of our financial position as of March 31, 2017, and results of operations for the three months endedMarch 31, 2017 and 2016 have been included. Such adjustments are normal and recurring in nature. The interim results presented are not necessarily indicative of results that can be expected for a full year. The accompanying interim unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes for the year ended December 31, 2016 appearing in UDR’s Annual Report on Form 10-K, filed with the Securities and Exchange Commission on February 21, 2017.

The accompanying interim unaudited consolidated financial statements are presented in accordance with U.S. generally accepted accounting principles (“GAAP”). GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the dates of the interim unaudited consolidated financial statements and the amounts of revenues and expenses during the reporting periods. Actual amounts realized or paid could differ from those estimates. All significant intercompany accounts and transactions have been eliminated in consolidation.

The Company evaluated subsequent events through the date its financial statements were issued. No significant recognized or non-recognized subsequent events were noted.

United Dominion Reality L.P. [Member]

Entity Information [Line Items]

CONSOLIDATION AND BASIS OF PRESENTATION

CONSOLIDATION AND BASIS OF PRESENTATION

Basis of Presentation

United Dominion Realty, L.P. (“UDR, L.P.,” the “Operating Partnership,” “we” or “our”) is a Delaware limited partnership, that owns, acquires, renovates, redevelops, manages, and disposes of multifamily apartment communities generally located in high barrier to entry markets located in the United States. The high barrier to entry markets are characterized by limited land for new construction, difficult and lengthy entitlement process, expensive single-family home prices and significant employment growth potential. UDR, L.P. is a subsidiary of UDR, Inc. (“UDR” or the “General Partner”), a self-administered real estate investment trust, or REIT, through which UDR conducts a significant portion of its business. During both the three months endedMarch 31, 2017 and 2016, rental revenues of the Operating Partnership represented 43% of the General Partner’s consolidated rental revenues. As of March 31, 2017, the Operating Partnership’s apartment portfolio consisted of 54 communities located in 14 markets consisting of 16,698 apartment homes.

Interests in UDR, L.P. are represented by operating partnership units (“OP Units”). The Operating Partnership’s net income is allocated to the partners, which is initially based on their respective distributions made during the year and secondly, their percentage interests. Distributions are made in accordance with the terms of the Amended and Restated Agreement of Limited Partnership of United Dominion Realty, L.P. (the “Operating Partnership Agreement”), on a per unit basis that is generally equal to the dividend per share on UDR’s common stock, which is publicly traded on the New York Stock Exchange (“NYSE”) under the ticker symbol “UDR.”

As of March 31, 2017, there were 183,350,924 OP Units outstanding, of which 174,233,691, or 95.0%, were owned by UDR and affiliated entities and 9,117,233, or 5.0%, were owned by non-affiliated limited partners. See Note 9, Capital Structure.

The accompanying interim unaudited consolidated financial statements have been prepared according to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and note disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted according to such rules and regulations, although management believes that the disclosures are adequate to make the information presented not misleading. In the opinion of management, all adjustments and eliminations necessary for the fair presentation of our financial position as of March 31, 2017, and results of operations for the three months endedMarch 31, 2017 and 2016 have been included. Such adjustments are normal and recurring in nature. The interim results presented are not necessarily indicative of results that can be expected for a full year. The accompanying interim unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes for the year ended December 31, 2016 included in the Annual Report on Form 10-K filed by UDR and the Operating Partnership with the SEC on February 21, 2017.

The accompanying interim unaudited consolidated statements are presented in accordance with U.S. generally accepted accounting principles (“GAAP”). GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the dates of the interim unaudited consolidated financial statements and the amounts of revenues and expenses during the reporting periods. Actual amounts realized or paid could differ from those estimates. All intercompany accounts and transactions have been eliminated in consolidation.

The Operating Partnership evaluated subsequent events through the date its financial statements were issued. No recognized or non-recognized subsequent events were noted.

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Significant Accounting Policies

3 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES

Recent Accounting Pronouncements

In January 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2017-01, Business Combinations (Topic 805), Clarifying the Definition of a Business. The ASU changes the definition of a business to assist entities with evaluating whether a set of transferred assets is a business. As a result, the accounting for acquisitions of real estate could be impacted. The updated standard will be effective for the Company on January 1, 2018; early adoption is permitted. The ASU will be applied prospectively to any transactions occurring within the period of adoption. The Company expects that the updated standard will result in fewer acquisitions of real estate meeting the definition of a business and fewer acquisition-related costs being expensed in the period incurred.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash. The ASU addresses the presentation of restricted cash and restricted cash equivalents in the statement of cash flows. The updated standard will be effective for the Company on January 1, 2018 and must be applied retrospectively to all periods presented; early adoption is permitted. The Company does not expect the updated standard to have a material impact on the consolidated financial statements and related disclosures.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230), Classification of Certain Cash Receipts and Cash Payments. The ASU addresses specific cash flow items with the objective of reducing existing diversity in practice, including the treatment of distributions received from equity method investees. The updated standard will be effective for the Company on January 1, 2018 and must be applied retrospectively to all periods presented; early adoption is permitted.

The Company elected to early adopt ASU 2016-15 in 2016 and elected to classify distributions received from equity method investees using the cumulative earnings approach. As a result, for the three months ended March 31, 2016, the following amounts classified under the adopted ASU as returns on investment in unconsolidated joint ventures were reclassified on the Consolidated Statements of Cash Flow (in thousands):

	Three Months Ended
	March 31, 2016
Return on investment in unconsolidated joint ventures - as previously presented	$	—
Return on investment in unconsolidated joint ventures	272
Return on investment in unconsolidated joint ventures - as presented herein	$	272
Distributions received from unconsolidated joint ventures - as previously presented	$	7,983
Return on investment in unconsolidated joint ventures	(272		)
Distributions received from unconsolidated joint ventures - as presented herein	$	7,711

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments. The standard requires entities to estimate a lifetime expected credit loss for most financial assets, including trade and other receivables, held-to-maturity debt securities, loans and other financial instruments, and to present the net amount of the financial instrument expected to be collected. The updated standard will be effective for the Company on January 1, 2020; early adoption is permitted on January 1, 2019. The Company is currently evaluating the effect that the updated standard will have on the consolidated financial statements and related disclosures.

In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718), Improvements to Employee Share-Based Payment Accounting. The ASU aims to simplify the accounting for share-based payments by amending the accounting for forfeitures, statutory tax withholding requirements, classification in the statements of cash flow and income taxes. The updated standard was effective for the Company on January 1, 2017, at which time the Company prospectively began accounting for forfeitures as incurred and began applying the updated rules for statutory withholdings. As a result of adopting the ASU, the Company recorded a one-time adjustment for existing estimated forfeitures of $0.6 million as of January 1, 2017 to Distributions in Excess of Net Income on January 1, 2017.

In February 2016, the FASB issued ASU No. 2016-02, Leases. The standard amends the existing lease accounting guidance and requires lessees to recognize a lease liability and a right-of-use asset for all leases (except for short-term leases that have a duration of one year or less) on their balance sheets. Lessees will continue to recognize lease expense in a manner similar to current accounting. For lessors, accounting for leases under the new guidance is substantially the same as in prior periods, but eliminates current real estate-specific provisions and changes the treatment of initial direct costs. Entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparable period presented, with an option to elect certain transition relief. Full retrospective application is prohibited. The standard will be effective for the Company on January 1, 2019, with early adoption permitted. While the Company is currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures, we expect to recognize right-of-use assets and related lease liabilities on our consolidated balance sheets related to ground leases on any communities where we are the lessee.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers. The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective, including industry-specific revenue guidance. The standard specifically excludes lease contracts. The ASU allows for the use of either the full or modified retrospective transition method and will be effective for the Company on January 1, 2018, at which time the Company expects to adopt the updated standard using the modified retrospective approach. However, as the majority of the Company’s revenue is from rental income related to leases, the Company does not expect the ASU to have a material impact on the consolidated financial statements and related disclosures.

Principles of Consolidation

The Company accounts for subsidiary partnerships, joint ventures and other similar entities in which it holds an ownership interest in accordance with the consolidation guidance. The Company first evaluates whether each entity is a variable interest entity ("VIE"). Under the VIE model, the Company consolidates an entity when it has control to direct the activities of the VIE and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. Under the voting model, the Company consolidates an entity when it controls the entity through ownership of a majority voting interest.

Discontinued Operations

In accordance with GAAP, a discontinued operation represents (1) a component of an entity or group of components that has been disposed of or is classified as held for sale in a single transaction and represents a strategic shift that has or will have a major effect on an entity’s financial results, or (2) an acquired business that is classified as held for sale on the date of acquisition. A strategic shift could include a disposal of (1) a separate major line of business, (2) a separate major geographic area of operations, (3) a major equity method investment, or (4) other major parts of an entity.

We record sales of real estate that do not meet the definition of a discontinued operation in Gain/(loss) on sale of real estate owned, net of taxon the Consolidated Statements of Operations.

Revenue and Real Estate Sales Gain Recognition

Rental income related to leases is recognized on an accrual basis when due from residents and tenants in accordance with GAAP. Rental payments are generally due on a monthly basis and recognized when earned. The Company recognizes interest income, management and other fees and incentives when earned, and the amounts are fixed and determinable.

For sale transactions meeting the requirements for full accrual profit recognition, we remove the related assets and liabilities from our Consolidated Balance Sheets and record the gain or loss in the period the transaction closes. For sale transactions that do not meet the full accrual sale criteria due to our continuing involvement, we evaluate the nature of the continuing involvement and account for the transaction under an alternate method of accounting. Unless certain limited criteria are met, non-monetary transactions, including property exchanges, are accounted for at fair value.

Sales to entities in which we retain or otherwise own an interest are accounted for as partial sales. If all other requirements for recognizing profit under the full accrual method have been satisfied and no other forms of continuing involvement are present, we recognize profit proportionate to the outside interest of the buyer and defer the gain on the interest we retain. The Company recognizes any deferred gain when the property is sold to a third party. In transactions accounted for by us as partial sales, we determine if the buyer of the majority equity interest in the venture was provided a preference as to cash flows in either an operating or a capital waterfall. If a cash flow preference has been provided, we recognize profit only to the extent that proceeds from the sale of the majority equity interest exceed costs related to the entire property.

Notes Receivable

The following table summarizes our notes receivable, net as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	Interest rate at		Balance outstanding
	March 31, 2017		March 31, 2017		December 31, 2016
Note due February 2020 (a)	10.00	%	$	12,994	$	12,994
Note due July 2017 (b)	8.00	%	2,500		2,500
Note due October 2020 (c)	8.00	%	1,296		1,296
Note due April 2021 (d)	10.00	%	3,000		3,000
Total notes receivable, net			$	19,790	$	19,790

(a) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $13.0 million. Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $5.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the eighth anniversary of the date of the note (February 2020).

(b) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $2.5 million. Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $5.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (July 2017).

(c) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $2.0 million, of which, $1.3 million has been funded. Interest payments are due when the loan matures. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $10.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (October 2020).

(d) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $15.0 million, of which, $3.0 million has been funded. Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $25.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (April 2021).

The Company recognized $0.5 million and $0.4 million of interest income from notes receivable during the three months endedMarch 31, 2017 and 2016, respectively, none of which was related party interest income. Interest income is included in Interest income and other income/(expense), net on the Consolidated Statements of Operations.

Comprehensive Income/(Loss)

Comprehensive income/(loss), which is defined as the change in equity during each period from transactions and other events and circumstances from nonowner sources, including all changes in equity during a period except for those resulting from investments by or distributions to stockholders, is displayed in the accompanying Consolidated Statements of Comprehensive Income/(Loss). For the three months endedMarch 31, 2017 and 2016, the Company’s other comprehensive income/(loss) consisted of the gain/(loss) (effective portion) on derivative instruments that are designated as and qualify as cash flow hedges, (gain)/loss on derivative instruments reclassified from other comprehensive income/(loss) into earnings, and the allocation of other comprehensive income/(loss) to noncontrolling interests. The (gain)/loss on derivative instruments reclassified from other comprehensive income/(loss) is included in Interest expense on the Consolidated Statements of Operations. See Note 10, Derivatives and Hedging Activity, for further discussion. The allocation of other comprehensive income/(loss) to redeemable noncontrolling interests during the three months endedMarch 31, 2017 and 2016 was $0.1 million and $(0.5) million, respectively.

Income Taxes

Due to the structure of the Company as a REIT and the nature of the operations for the operating properties, no provision for federal income taxes has been provided for at UDR. Historically, the Company has generally incurred only state and local excise and franchise taxes. UDR has elected for certain consolidated subsidiaries to be treated as taxable REIT subsidiaries (“TRS”).

Income taxes for our TRS are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities from a change in tax rate is recognized in earnings in the period of the enactment date. The Company’s deferred tax assets are generally the result of differing depreciable lives on capitalized assets and timing of expense recognition for certain accrued liabilities. As of March 31, 2017 and December 31, 2016, UDR’s net deferred tax asset was $0.4 million and $0.6 million, respectively.

GAAP defines a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. GAAP also provides guidance on derecognition, classification, interest and penalties, accounting for interim periods, disclosure and transition.

The Company recognizes its tax positions and evaluates them using a two-step process. First, UDR determines whether a tax position is more likely than not (greater than 50 percent probability) to be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. Second, the Company will determine the amount of benefit to recognize and record the amount that is more likely than not to be realized upon ultimate settlement.

UDR had no material unrecognized tax benefit, accrued interest or penalties at March 31, 2017. UDR and its subsidiaries are subject to federal income tax as well as income tax of various state and local jurisdictions. The tax years 2013 through 2016 remain open to examination by tax jurisdictions to which we are subject. When applicable, UDR recognizes interest and/or penalties related to uncertain tax positions in Tax (provision)/benefit, net on the Consolidated Statements of Operations.

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Significant Accounting Policies (UNITED DOMINION REALTY, L.P.)

3 Months Ended

Mar. 31, 2017

Entity Information [Line Items]

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES

Recent Accounting Pronouncements

In January 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2017-01, Business Combinations (Topic 805), Clarifying the Definition of a Business. The ASU changes the definition of a business to assist entities with evaluating whether a set of transferred assets is a business. As a result, the accounting for acquisitions of real estate could be impacted. The updated standard will be effective for the Company on January 1, 2018; early adoption is permitted. The ASU will be applied prospectively to any transactions occurring within the period of adoption. The Company expects that the updated standard will result in fewer acquisitions of real estate meeting the definition of a business and fewer acquisition-related costs being expensed in the period incurred.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash. The ASU addresses the presentation of restricted cash and restricted cash equivalents in the statement of cash flows. The updated standard will be effective for the Company on January 1, 2018 and must be applied retrospectively to all periods presented; early adoption is permitted. The Company does not expect the updated standard to have a material impact on the consolidated financial statements and related disclosures.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230), Classification of Certain Cash Receipts and Cash Payments. The ASU addresses specific cash flow items with the objective of reducing existing diversity in practice, including the treatment of distributions received from equity method investees. The updated standard will be effective for the Company on January 1, 2018 and must be applied retrospectively to all periods presented; early adoption is permitted.

The Company elected to early adopt ASU 2016-15 in 2016 and elected to classify distributions received from equity method investees using the cumulative earnings approach. As a result, for the three months ended March 31, 2016, the following amounts classified under the adopted ASU as returns on investment in unconsolidated joint ventures were reclassified on the Consolidated Statements of Cash Flow (in thousands):

	Three Months Ended
	March 31, 2016
Return on investment in unconsolidated joint ventures - as previously presented	$	—
Return on investment in unconsolidated joint ventures	272
Return on investment in unconsolidated joint ventures - as presented herein	$	272
Distributions received from unconsolidated joint ventures - as previously presented	$	7,983
Return on investment in unconsolidated joint ventures	(272		)
Distributions received from unconsolidated joint ventures - as presented herein	$	7,711

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments. The standard requires entities to estimate a lifetime expected credit loss for most financial assets, including trade and other receivables, held-to-maturity debt securities, loans and other financial instruments, and to present the net amount of the financial instrument expected to be collected. The updated standard will be effective for the Company on January 1, 2020; early adoption is permitted on January 1, 2019. The Company is currently evaluating the effect that the updated standard will have on the consolidated financial statements and related disclosures.

In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718), Improvements to Employee Share-Based Payment Accounting. The ASU aims to simplify the accounting for share-based payments by amending the accounting for forfeitures, statutory tax withholding requirements, classification in the statements of cash flow and income taxes. The updated standard was effective for the Company on January 1, 2017, at which time the Company prospectively began accounting for forfeitures as incurred and began applying the updated rules for statutory withholdings. As a result of adopting the ASU, the Company recorded a one-time adjustment for existing estimated forfeitures of $0.6 million as of January 1, 2017 to Distributions in Excess of Net Income on January 1, 2017.

In February 2016, the FASB issued ASU No. 2016-02, Leases. The standard amends the existing lease accounting guidance and requires lessees to recognize a lease liability and a right-of-use asset for all leases (except for short-term leases that have a duration of one year or less) on their balance sheets. Lessees will continue to recognize lease expense in a manner similar to current accounting. For lessors, accounting for leases under the new guidance is substantially the same as in prior periods, but eliminates current real estate-specific provisions and changes the treatment of initial direct costs. Entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparable period presented, with an option to elect certain transition relief. Full retrospective application is prohibited. The standard will be effective for the Company on January 1, 2019, with early adoption permitted. While the Company is currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures, we expect to recognize right-of-use assets and related lease liabilities on our consolidated balance sheets related to ground leases on any communities where we are the lessee.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers. The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective, including industry-specific revenue guidance. The standard specifically excludes lease contracts. The ASU allows for the use of either the full or modified retrospective transition method and will be effective for the Company on January 1, 2018, at which time the Company expects to adopt the updated standard using the modified retrospective approach. However, as the majority of the Company’s revenue is from rental income related to leases, the Company does not expect the ASU to have a material impact on the consolidated financial statements and related disclosures.

Principles of Consolidation

The Company accounts for subsidiary partnerships, joint ventures and other similar entities in which it holds an ownership interest in accordance with the consolidation guidance. The Company first evaluates whether each entity is a variable interest entity ("VIE"). Under the VIE model, the Company consolidates an entity when it has control to direct the activities of the VIE and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. Under the voting model, the Company consolidates an entity when it controls the entity through ownership of a majority voting interest.

Discontinued Operations

In accordance with GAAP, a discontinued operation represents (1) a component of an entity or group of components that has been disposed of or is classified as held for sale in a single transaction and represents a strategic shift that has or will have a major effect on an entity’s financial results, or (2) an acquired business that is classified as held for sale on the date of acquisition. A strategic shift could include a disposal of (1) a separate major line of business, (2) a separate major geographic area of operations, (3) a major equity method investment, or (4) other major parts of an entity.

We record sales of real estate that do not meet the definition of a discontinued operation in Gain/(loss) on sale of real estate owned, net of taxon the Consolidated Statements of Operations.

Revenue and Real Estate Sales Gain Recognition

Rental income related to leases is recognized on an accrual basis when due from residents and tenants in accordance with GAAP. Rental payments are generally due on a monthly basis and recognized when earned. The Company recognizes interest income, management and other fees and incentives when earned, and the amounts are fixed and determinable.

For sale transactions meeting the requirements for full accrual profit recognition, we remove the related assets and liabilities from our Consolidated Balance Sheets and record the gain or loss in the period the transaction closes. For sale transactions that do not meet the full accrual sale criteria due to our continuing involvement, we evaluate the nature of the continuing involvement and account for the transaction under an alternate method of accounting. Unless certain limited criteria are met, non-monetary transactions, including property exchanges, are accounted for at fair value.

Sales to entities in which we retain or otherwise own an interest are accounted for as partial sales. If all other requirements for recognizing profit under the full accrual method have been satisfied and no other forms of continuing involvement are present, we recognize profit proportionate to the outside interest of the buyer and defer the gain on the interest we retain. The Company recognizes any deferred gain when the property is sold to a third party. In transactions accounted for by us as partial sales, we determine if the buyer of the majority equity interest in the venture was provided a preference as to cash flows in either an operating or a capital waterfall. If a cash flow preference has been provided, we recognize profit only to the extent that proceeds from the sale of the majority equity interest exceed costs related to the entire property.

Notes Receivable

The following table summarizes our notes receivable, net as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	Interest rate at		Balance outstanding
	March 31, 2017		March 31, 2017		December 31, 2016
Note due February 2020 (a)	10.00	%	$	12,994	$	12,994
Note due July 2017 (b)	8.00	%	2,500		2,500
Note due October 2020 (c)	8.00	%	1,296		1,296
Note due April 2021 (d)	10.00	%	3,000		3,000
Total notes receivable, net			$	19,790	$	19,790

(a) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $13.0 million. Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $5.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the eighth anniversary of the date of the note (February 2020).

(b) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $2.5 million. Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $5.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (July 2017).

(c) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $2.0 million, of which, $1.3 million has been funded. Interest payments are due when the loan matures. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $10.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (October 2020).

(d) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $15.0 million, of which, $3.0 million has been funded. Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $25.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (April 2021).

The Company recognized $0.5 million and $0.4 million of interest income from notes receivable during the three months endedMarch 31, 2017 and 2016, respectively, none of which was related party interest income. Interest income is included in Interest income and other income/(expense), net on the Consolidated Statements of Operations.

Comprehensive Income/(Loss)

Comprehensive income/(loss), which is defined as the change in equity during each period from transactions and other events and circumstances from nonowner sources, including all changes in equity during a period except for those resulting from investments by or distributions to stockholders, is displayed in the accompanying Consolidated Statements of Comprehensive Income/(Loss). For the three months endedMarch 31, 2017 and 2016, the Company’s other comprehensive income/(loss) consisted of the gain/(loss) (effective portion) on derivative instruments that are designated as and qualify as cash flow hedges, (gain)/loss on derivative instruments reclassified from other comprehensive income/(loss) into earnings, and the allocation of other comprehensive income/(loss) to noncontrolling interests. The (gain)/loss on derivative instruments reclassified from other comprehensive income/(loss) is included in Interest expense on the Consolidated Statements of Operations. See Note 10, Derivatives and Hedging Activity, for further discussion. The allocation of other comprehensive income/(loss) to redeemable noncontrolling interests during the three months endedMarch 31, 2017 and 2016 was $0.1 million and $(0.5) million, respectively.

Income Taxes

Due to the structure of the Company as a REIT and the nature of the operations for the operating properties, no provision for federal income taxes has been provided for at UDR. Historically, the Company has generally incurred only state and local excise and franchise taxes. UDR has elected for certain consolidated subsidiaries to be treated as taxable REIT subsidiaries (“TRS”).

Income taxes for our TRS are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities from a change in tax rate is recognized in earnings in the period of the enactment date. The Company’s deferred tax assets are generally the result of differing depreciable lives on capitalized assets and timing of expense recognition for certain accrued liabilities. As of March 31, 2017 and December 31, 2016, UDR’s net deferred tax asset was $0.4 million and $0.6 million, respectively.

GAAP defines a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. GAAP also provides guidance on derecognition, classification, interest and penalties, accounting for interim periods, disclosure and transition.

The Company recognizes its tax positions and evaluates them using a two-step process. First, UDR determines whether a tax position is more likely than not (greater than 50 percent probability) to be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. Second, the Company will determine the amount of benefit to recognize and record the amount that is more likely than not to be realized upon ultimate settlement.

UDR had no material unrecognized tax benefit, accrued interest or penalties at March 31, 2017. UDR and its subsidiaries are subject to federal income tax as well as income tax of various state and local jurisdictions. The tax years 2013 through 2016 remain open to examination by tax jurisdictions to which we are subject. When applicable, UDR recognizes interest and/or penalties related to uncertain tax positions in Tax (provision)/benefit, net on the Consolidated Statements of Operations.

United Dominion Reality L.P. [Member]

Entity Information [Line Items]

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES

Recent Accounting Pronouncements

In January 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2017-01, Business Combinations (Topic 805), Clarifying the Definition of a Business. The ASU changes the definition of a business to assist entities with evaluating whether a set of transferred assets is a business. As a result, the accounting for acquisitions of real estate could be impacted. The updated standard will be effective for the Operating Partnership on January 1, 2018; early adoption is permitted. The ASU will be applied prospectively to any transactions occurring within the period of adoption. The Operating Partnership expects that the updated standard will result in fewer acquisitions of real estate meeting the definition of a business and fewer acquisition-related costs being expensed in the period incurred.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash. The ASU addresses the presentation of restricted cash and restricted cash equivalents in the statement of cash flows. The updated standard will be effective for the Operating Partnership on January 1, 2018 and must be applied retrospectively to all periods presented; early adoption is permitted. The Operating Partnership does not expect the updated standard to have a material impact on the consolidated financial statements and related disclosures.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230), Classification of Certain Cash Receipts and Cash Payments. The ASU addresses specific cash flow items with the objective of reducing existing diversity in practice, including the treatment of distributions received from equity method investees. The updated standard will be effective for the Operating Partnership on January 1, 2018 and must be applied retrospectively to all periods presented; early adoption is permitted. The Operating Partnership elected to early adopt ASU 2016-15 in 2016. The adoption did not have an impact on the Operating Partnership's consolidated financial statements and related disclosures.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments. The standard requires entities to estimate a lifetime expected credit loss for most financial assets, including trade and other receivables, held-to-maturity debt securities, loans and other financial instruments, and to present the net amount of the financial instrument expected to be collected. The updated standard will be effective for the Operating Partnership on January 1, 2020; early adoption is permitted on January 1, 2019. The Operating Partnership is currently evaluating the effect that the updated standard will have on the consolidated financial statements and related disclosures.

In February 2016, the FASB issued ASU No. 2016-02, Leases. The standard amends the existing lease accounting guidance and requires lessees to recognize a lease liability and a right-of-use asset for all leases (except for short-term leases that have a duration of one year or less) on their balance sheets. Lessees will continue to recognize lease expense in a manner similar to current accounting. For lessors, accounting for leases under the new guidance is substantially the same as in prior periods, but eliminates current real estate-specific provisions and changes the treatment of initial direct costs. Entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparable period presented, with an option to elect certain transition relief. Full retrospective application is prohibited. The standard will be effective for the Operating Partnership on January 1, 2019, with early adoption permitted. While the Operating Partnership is currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures, we expect to recognize right-of-use assets and related lease liabilities on our consolidated balance sheets related to ground leases on any communities where we are the lessee.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers. The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective, including industry-specific revenue guidance. The standard specifically excludes lease contracts. The ASU allows for the use of either the full or modified retrospective transition method and will be effective for the Operating Partnership on January 1, 2018, at which time the Operating Partnership expects to adopt the updated standard using the modified retrospective approach. However, as the majority of the Operating Partnership's revenue is from rental income related to leases, the Operating Partnership does not expect the ASU to have a material impact on the consolidated financial statements and related disclosures.

Principles of Consolidation

The Operating Partnership accounts for subsidiary partnerships, joint ventures and other similar entities in which it holds an ownership interest in accordance with the amended consolidation guidance. The Operating Partnership first evaluates whether each entity is a variable interest entity ("VIE"). Under the VIE model, the Operating Partnership consolidates an entity when it has control to direct the activities of the VIE and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. Under the voting model, the Operating Partnership consolidates an entity when it controls the entity through ownership of a majority voting interest.

Discontinued Operations

In accordance with GAAP, a discontinued operation represents (1) a component of an entity or group of components that has been disposed of or is classified as held for sale in a single transaction and represents a strategic shift that has or will have a major effect on an entity’s financial results, or (2) an acquired business that is classified as held for sale on the date of acquisition. A strategic shift could include a disposal of (1) a separate major line of business, (2) a separate major geographic area of operations, (3) a major equity method investment, or (4) other major parts of an entity.

We record sales of real estate that do not meet the definition of a discontinued operation in Gain/(loss) on sale of real estate owned, net of taxon the Consolidated Statements of Operations.

Income/(Loss) Per Operating Partnership Unit

Basic income/(loss) per OP Unit is computed by dividing net income/(loss) attributable to the general and limited partner unitholders by the weighted average number of general and limited partner units outstanding during the year. Diluted income/(loss) per OP Unit reflects the potential dilution that could occur if securities or other contracts to issue OP Units were exercised or converted into OP Units or resulted in the issuance of OP Units and then shared in the income/(loss) of the Operating Partnership.

Revenue and Real Estate Sales Gain Recognition

Rental income related to leases is recognized on an accrual basis when due from residents and tenants in accordance with GAAP. Rental payments are generally due on a monthly basis and recognized when earned. The Operating Partnership recognizes interest income, fees and incentives when earned, fixed and determinable.

For sale transactions meeting the requirements for full accrual profit recognition, we remove the related assets and liabilities from our Consolidated Balance Sheets and record the gain or loss in the period the transaction closes. For sale transactions that do not meet the full accrual sale criteria due to our continuing involvement, we evaluate the nature of the continuing involvement and account for the transaction under an alternate method of accounting. Unless certain limited criteria are met, non-monetary transactions, including property exchanges, are accounted for at fair value.

Sales to entities in which we or our General Partner retain or otherwise own an interest are accounted for as partial sales. If all other requirements for recognizing profit under the full accrual method have been satisfied and no other forms of continuing involvement are present, we recognize profit proportionate to the outside interest in the buyer and defer the gain on the interest we or our General Partner retain. The Operating Partnership recognizes any deferred gain when the property is sold to a third party. In transactions accounted by us as partial sales, we determine if the buyer of the majority equity interest in the venture was provided a preference as to cash flows in either an operating or a capital waterfall. If a cash flow preference has been provided, we recognize profit only to the extent that proceeds from the sale of the majority equity interest exceed costs related to the entire property.

Comprehensive Income/(Loss)

Comprehensive income/(loss), which is defined as the change in equity during each period from transactions and other events and circumstances from nonowner sources, including all changes in equity during a period except for those resulting from investments by or distributions to unitholders, is displayed in the accompanying Consolidated Statements of Comprehensive Income/(Loss). For the three months endedMarch 31, 2017 and 2016, the Operating Partnership’s other comprehensive income/(loss) consisted of the gain/(loss) (effective portion) on derivative instruments that are designated as and qualify as cash flow hedges and (gain)/loss reclassified from other comprehensive income/(loss) into earnings. The (gain)/loss reclassified from other comprehensive income/(loss) is included in Interest expense on the Consolidated Statements of Operations. See Note 8, Derivatives and Hedging Activity, for further discussion.

Income Taxes

The taxable income or loss of the Operating Partnership is reported on the tax returns of the partners. Accordingly, no provision has been made in the accompanying financial statements for federal or state income taxes on income that is passed through to the partners. However, any state or local revenue, excise or franchise taxes that result from the operating activities of the Operating Partnership are recorded at the entity level. The Operating Partnership’s tax returns are subject to examination by federal and state taxing authorities. Net income for financial reporting purposes differs from the net income for income tax reporting purposes primarily due to temporary differences, principally real estate depreciation and the tax deferral of certain gains on property sales. The differences in depreciation result from differences in the book and tax basis of certain real estate assets and the differences in the methods of depreciation and lives of the real estate assets.

The Operating Partnership evaluates the accounting and disclosure of tax positions taken or expected to be taken in the course of preparing the Operating Partnership’s tax returns to determine whether the tax positions are “more-likely-than-not” of being sustained by the applicable tax authority. Tax positions not deemed to meet the more-likely-than-not threshold would be recorded as a tax benefit or expense in the current year. Management of the Operating Partnership is required to analyze all open tax years, as defined by the statute of limitations, for all major jurisdictions, which include federal and certain states. The Operating Partnership has no examinations in progress and none are expected at this time.

Management of the Operating Partnership has reviewed all open tax years (2013 through 2016) of tax jurisdictions and concluded there is no tax liability resulting from unrecognized tax benefits relating to uncertain income tax positions taken or expected to be taken in future tax returns.

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Real Estate Owned

3 Months Ended

Mar. 31, 2017

Real Estate [Abstract]

REAL ESTATE OWNED

REAL ESTATE OWNED

Real estate assets owned by the Company consist of income producing operating properties, properties under development, land held for future development, and sold or held for disposition properties. As of March 31, 2017, the Company owned and consolidated 128 communities in 10 states plus the District of Columbia totaling 39,698 apartment homes. The following table summarizes the carrying amounts for our real estate owned (at cost) as of March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Land	$	1,812,797		$	1,801,576
Depreciable property — held and used:
Land improvements	180,837			178,701
Building, improvements, and furniture, fixtures and equipment	7,400,098			7,291,570
Under development:
Land and land improvements	111,028			111,028
Building, improvements, and furniture, fixtures and equipment	282,809			231,254
Real estate held for disposition:
Land and land improvements	—			1,104
Building, improvements, and furniture, fixtures and equipment	—			520
Real estate owned	9,787,569			9,615,753
Accumulated depreciation	(3,026,660		)	(2,923,625		)
Real estate owned, net	$	6,760,909		$	6,692,128

Acquisitions

During the three months endedMarch 31, 2017, the Company exercised its fixed-price option to purchase its joint venture partner's ownership interest in a 244 home operating community in Seattle, Washington, thereby increasing its ownership interest from 49% to 100%, for a cash purchase price of approximately $66.0 million. As a result, the Company consolidated the operating community. The Company had previously accounted for its 49% ownership interest as a preferred equity investment in an unconsolidated joint venture (see Note 5, Joint Ventures and Partnerships). As a result of the consolidation, the Company increased its real estate owned by approximately $97.0 million, recorded approximately $1.7 million of in-place lease intangibles and recorded a gain on consolidation of $12.2 million, which is included in Income/(loss) from unconsolidated entities on the Consolidated Statements of Operations.

Dispositions

During the three months endedMarch 31, 2017, the Company sold a parcel of land in Richmond, Virginia for gross proceeds of $3.5 million, resulting in net proceeds of $3.3 million and a gain of $2.1 million.

Predevelopment, development, and redevelopment projects and related costs are capitalized and reported on the Consolidated Balance Sheets as Total real estate owned, net of accumulated depreciation. The Company capitalizes costs directly related to the predevelopment, development, and redevelopment of a capital project, which include, but are not limited to, interest, real estate taxes, insurance, and allocated development and redevelopment overhead related to support costs for personnel working on the capital projects. We use our professional judgment in determining whether such costs meet the criteria for capitalization or must be expensed as incurred. These costs are capitalized only during the period in which activities necessary to ready an asset for its intended use are in progress and such costs are incremental and identifiable to a specific activity to get the asset ready for its intended use. These costs, excluding the direct costs of development and redevelopment and capitalized interest, were $2.8 million and $2.0 million for the three months endedMarch 31, 2017 and 2016, respectively. Total interest capitalized was $4.7 million and $4.2 million for the three months endedMarch 31, 2017 and 2016, respectively. As each home in a capital project is completed and becomes available for lease-up, the Company ceases capitalization on the related portion and depreciation commences over the estimated useful life.

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Real Estate Owned (UNITED DOMINION REALTY, L.P.)

3 Months Ended

Mar. 31, 2017

Entity Information [Line Items]

REAL ESTATE OWNED

REAL ESTATE OWNED

Real estate assets owned by the Company consist of income producing operating properties, properties under development, land held for future development, and sold or held for disposition properties. As of March 31, 2017, the Company owned and consolidated 128 communities in 10 states plus the District of Columbia totaling 39,698 apartment homes. The following table summarizes the carrying amounts for our real estate owned (at cost) as of March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Land	$	1,812,797		$	1,801,576
Depreciable property — held and used:
Land improvements	180,837			178,701
Building, improvements, and furniture, fixtures and equipment	7,400,098			7,291,570
Under development:
Land and land improvements	111,028			111,028
Building, improvements, and furniture, fixtures and equipment	282,809			231,254
Real estate held for disposition:
Land and land improvements	—			1,104
Building, improvements, and furniture, fixtures and equipment	—			520
Real estate owned	9,787,569			9,615,753
Accumulated depreciation	(3,026,660		)	(2,923,625		)
Real estate owned, net	$	6,760,909		$	6,692,128

Acquisitions

During the three months endedMarch 31, 2017, the Company exercised its fixed-price option to purchase its joint venture partner's ownership interest in a 244 home operating community in Seattle, Washington, thereby increasing its ownership interest from 49% to 100%, for a cash purchase price of approximately $66.0 million. As a result, the Company consolidated the operating community. The Company had previously accounted for its 49% ownership interest as a preferred equity investment in an unconsolidated joint venture (see Note 5, Joint Ventures and Partnerships). As a result of the consolidation, the Company increased its real estate owned by approximately $97.0 million, recorded approximately $1.7 million of in-place lease intangibles and recorded a gain on consolidation of $12.2 million, which is included in Income/(loss) from unconsolidated entities on the Consolidated Statements of Operations.

Dispositions

During the three months endedMarch 31, 2017, the Company sold a parcel of land in Richmond, Virginia for gross proceeds of $3.5 million, resulting in net proceeds of $3.3 million and a gain of $2.1 million.

Predevelopment, development, and redevelopment projects and related costs are capitalized and reported on the Consolidated Balance Sheets as Total real estate owned, net of accumulated depreciation. The Company capitalizes costs directly related to the predevelopment, development, and redevelopment of a capital project, which include, but are not limited to, interest, real estate taxes, insurance, and allocated development and redevelopment overhead related to support costs for personnel working on the capital projects. We use our professional judgment in determining whether such costs meet the criteria for capitalization or must be expensed as incurred. These costs are capitalized only during the period in which activities necessary to ready an asset for its intended use are in progress and such costs are incremental and identifiable to a specific activity to get the asset ready for its intended use. These costs, excluding the direct costs of development and redevelopment and capitalized interest, were $2.8 million and $2.0 million for the three months endedMarch 31, 2017 and 2016, respectively. Total interest capitalized was $4.7 million and $4.2 million for the three months endedMarch 31, 2017 and 2016, respectively. As each home in a capital project is completed and becomes available for lease-up, the Company ceases capitalization on the related portion and depreciation commences over the estimated useful life.

United Dominion Reality L.P. [Member]

Entity Information [Line Items]

REAL ESTATE OWNED

REAL ESTATE OWNED

Real estate assets owned by the Operating Partnership consist of income producing operating properties, properties under development, land held for future development, and sold or held for disposition properties. At March 31, 2017, the Operating Partnership owned and consolidated 54 communities in eight states plus the District of Columbia totaling 16,698 apartment homes. The following table summarizes the carrying amounts for our real estate owned (at cost) as of March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Land	$	837,945		$	836,644
Depreciable property — held and used:
Buildings, improvements, and furniture, fixtures and equipment	2,848,389			2,838,060
Real estate owned	3,686,334			3,674,704
Accumulated depreciation	(1,445,528		)	(1,408,815		)
Real estate owned, net	$	2,240,806		$	2,265,889

The Operating Partnership did not have any acquisitions or sales of real estate during the three months endedMarch 31, 2017.

Predevelopment, development, and redevelopment projects and related costs are capitalized and reported on the Consolidated Balance Sheets asTotal real estate owned, net of accumulated depreciation. The Operating Partnership capitalizes costs directly related to the predevelopment, development, and redevelopment of a capital project, which include, but are not limited to, interest, real estate taxes, insurance, and allocated development and redevelopment overhead related to support costs for personnel working on the capital projects. We use our professional judgment in determining whether such costs meet the criteria for capitalization or must be expensed as incurred. These costs are capitalized only during the period in which activities necessary to ready an asset for its intended use are in progress and such costs are incremental and identifiable to a specific activity to get the asset ready for its intended use. These costs, excluding the direct costs of development and redevelopment and capitalized interest, were $0.3 million and $0.3 million for the three months endedMarch 31, 2017 and 2016, respectively. Total interest capitalized was less than $0.1 million and $0.1 million for the three months endedMarch 31, 2017 and 2016, respectively. As each home in a capital project is completed and becomes available for lease-up, the Operating Partnership ceases capitalization on the related portion and depreciation commences over the estimated useful life.

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Variable Interest Entities (Notes)

3 Months Ended

Mar. 31, 2017

Equity Method Investments and Joint Ventures [Abstract]

Variable Interest Entity Disclosure [Text Block]

VARIABLE INTEREST ENTITIES

The Company has determined that the Operating Partnership and DownREIT Partnership are VIEs as the limited partners lack substantive kick-out rights and substantive participating rights. The Company has concluded that it is the primary beneficiary of, and therefore consolidates the Operating Partnership and DownREIT Partnership based on its role as the sole general partner of the Operating Partnership and DownREIT Partnership. The Company's role as community manager and its equity interests give us the power to direct the activities that most significantly impact the economic performance and the obligation to absorb potentially significant losses or the right to receive potentially significant benefits of the Operating Partnership and DownREIT Partnership.

See the consolidated financial statements of the Operating Partnership presented within this Report and Note 4, Unconsolidated Entities, to the Operating Partnership's consolidated financial statements for the results of operations of the Operating Partnership and DownREIT Partnership, respectively.

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Joint Ventures

3 Months Ended

Mar. 31, 2017

Schedule of Equity Method Investments [Line Items]

Equity Method Investments and Joint Ventures Disclosure [Text Block]

JOINT VENTURES AND PARTNERSHIPS

UDR has entered into joint ventures and partnerships with unrelated third parties to acquire real estate assets that are either consolidated and included in Real estate owned on the Consolidated Balance Sheets or are accounted for under the equity method of accounting, and are included in Investment in and advances to unconsolidated joint ventures, net, on the Consolidated Balance Sheets. The Company consolidates the entities that we control as well as any variable interest entity where we are the primary beneficiary. In addition, the Company consolidates any joint venture or partnership in which we are the general partner or managing member and the third party does not have the ability to substantively participate in the decision-making process nor the ability to remove us as general partner or managing member without cause.

UDR’s joint ventures and partnerships are funded with a combination of debt and equity. Our losses are limited to our investment and except as noted below, the Company does not guarantee any debt, capital payout or other obligations associated with our joint ventures and partnerships.

The Company recognizes earnings or losses from our investments in unconsolidated joint ventures and partnerships consisting of our proportionate share of the net earnings or losses of the joint ventures and partnerships. In addition, we may earn fees for providing management services to the unconsolidated joint ventures and partnerships.

The following table summarizes the Company’s investment in and advances to unconsolidated joint ventures and partnerships, net, which are accounted for under the equity method of accounting as of March 31, 2017 and December 31, 2016(dollars in thousands):

Joint Venture	Location of Properties	Number of Properties	Number of Apartment Homes	Investment at				UDR’s Ownership Interest
		March 31, 2017	March 31, 2017	March 31, 2017		December 31, 2016		March 31, 2017			December 31, 2016
Operating and development:
UDR/MetLife I	Los Angeles, CA	1 development community (a)	150	$	29,182	$	25,209	50.0		%	50.0		%
UDR/MetLife II (b)	Various	18 operating communities	4,059	309,409		311,282		50.0		%	50.0		%
Other UDR/MetLife Development Joint Ventures		1 operating community;
	Various	4 development communities (a)	1,437	156,096		160,979		50.6		%	50.6		%
UDR/MetLife Vitruvian Park®	Addison, TX	3 operating communities;
		1 development community (a);
		5 land parcels	1,513	73,154		72,414		50.0		%	50.0		%
UDR/KFH	Washington, D.C.	3 operating communities	660	11,801		12,835		30.0		%	30.0		%
Investment in and advances to unconsolidated joint ventures, net, before participating loan investment and preferred equity investment				$	579,642	$	582,719
								Income from investments for the three months ending March 31,
				Investment at
	Location	Rate	Years To Maturity	March 31, 2017		December 31, 2016		2017			2016
Participating loan investment:
Steele Creek	Denver, CO	6.5%	0.3	$	94,002	$	94,003	$	1,533		$	1,519
Preferred equity investment:
West Coast Development Joint Ventures (c)	Various	6.5% (c)	N/A	145,346		150,303		$	12,766		$	1,427
Total investment in and advances to unconsolidated joint ventures, net				$	818,990	$	827,025

(a) The number of apartment homes for the communities under development presented in the table above is based on the projected number of total homes upon completion of development. As of March 31, 2017, 1,018 apartment homes had been completed in Other UDR/MetLife Development Joint Ventures, and no apartment homes had been completed in UDR/MetLife I or in UDR/MetLife Vitruvian Park^®.

(b) In September 2015, the 717 Olympic community, which is owned by the UDR/MetLife II joint venture, experienced extensive water damage due to a ruptured water pipe. For the three months endedMarch 31, 2017 and 2016, the Company recorded casualty-related charges/(recoveries) of $0.9 million and $(1.1) million, respectively, representing its proportionate share of the total charges/(recoveries) recognized.

(c) In May 2015, the Company entered into a joint venture agreement with an unaffiliated joint venture partner and agreed to pay $136.3 million for a 48% ownership interest in a portfolio of five communities that were under construction. The communities are located in three of the Company’s core, coastal markets: Seattle, Washington, Los Angeles and Orange County, California. UDR earns a 6.5% preferred return on its investment through each individual community’s date of stabilization, defined as when a community reaches 80% occupancy for 90 consecutive days, while the joint venture partner is allocated all operating income and expense during the pre-stabilization period. Upon stabilization, income and expense are shared based on each partner’s ownership percentage and the Company no longer receives a 6.5% preferred return on its investment in the stabilized community. The Company serves as property manager and earns a management fee during the lease-up phase and subsequent operation of each of the communities. The unaffiliated joint venture partner is the general partner of the joint venture and the developer of the communities.

At inception of the agreement, the Company had a fixed-price option to acquire the remaining interest in each community beginning one year after completion. If the options are exercised for all five communities, the Company’s total purchase price will be $597.4 million. In the event the Company does not exercise its options to purchase at least two communities, the unaffiliated joint venture partner will be entitled to earn a contingent disposition fee equal to a 6.5% return on its implied equity in the communities not acquired. The unaffiliated joint venture partner is providing certain guaranties and there are construction loans on all five communities.

During the three months endedMarch 31, 2017, the Company exercised its fixed-price option to purchase the joint venture partner’s ownership interest in one of the five communities, a 244 home operating community in Seattle, Washington, thereby increasing its ownership interest from 49% to 100%, for a cash purchase price of approximately $66.0 million. As a result, the Company consolidated the operating community and it is no longer accounted for as a preferred equity investment in an unconsolidated joint venture (see Note 4, Real Estate Owned). As a result of the consolidation, the Company recorded a gain on consolidation of $12.2 million, which is included in Income/(loss) from unconsolidated entities on the Consolidated Statements of Operations.

As of March 31, 2017, construction was completed on three of the four remaining communities. Two of the four remaining communities had achieved stabilization. The other two remaining communities have not achieved stabilization and the Company continues to receive a 6.5% preferred return on its investment in those communities.

In March 2017, the Company entered into an additional joint venture agreement with the unaffiliated joint venture partner and agreed to pay $15.5 million for a 49% ownership interest in a 155 home community that is currently under construction in Seattle, Washington (together with the May 2015 joint venture described above, the “West Coast Development Joint Ventures”). Consistent with the terms of the May 2015 joint venture agreement, UDR earns a 6.5% preferred return on its investment through the community’s date of stabilization, as defined above, while our joint venture partner is allocated all operating income and expense during the pre-stabilization period. Upon stabilization, income and expense will be shared based on each partner’s ownership percentage and the Company will no longer receive a 6.5% preferred return on its investment in the stabilized community. The Company will serve as property manager and will earn a management fee during the lease-up phase and subsequent operation of the community. The unaffiliated joint venture partner is the general partner and the developer of the community. The Company has concluded it does not control the joint venture and accounts for it under the equity method of accounting.

The Company has a fixed-price option to acquire the remaining interest in the community beginning one year after completion for a total price of $61.3 million. The unaffiliated joint venture partner is providing certain guaranties and there is a construction loan on the community.

The Company's recorded equity investment in the West Coast Development Joint Ventures at March 31, 2017 and December 31, 2016 of $145.3 million and $150.3 million, respectively, is inclusive of outside basis costs and our accrued but unpaid preferred return.

As of March 31, 2017 and December 31, 2016, the Company had deferred fees and deferred profit of $9.7 million and $9.5 million, respectively, which will be recognized through earnings over the weighted average life of the related properties, upon the disposition of the properties to a third party, or upon completion of certain development obligations.

The Company recognized management fees of $2.6 million and $2.8 million for the three months endedMarch 31, 2017 and 2016, respectively, for our management of the communities held by the joint ventures and partnerships. The management fees are included in Joint venture management and other fees on the Consolidated Statements of Operations.

The Company may, in the future, make additional capital contributions to certain of our joint ventures and partnerships should additional capital contributions be necessary to fund acquisitions or operations.

We evaluate our investments in unconsolidated joint ventures and partnerships when events or changes in circumstances indicate that there may be an other-than-temporary decline in value. We consider various factors to determine if a decrease in the value of the investment is other-than-temporary. The Company did not recognize any other-than-temporary decreases in the value of its investments in unconsolidated joint ventures or partnerships during the three months endedMarch 31, 2017 and 2016.

Combined summary balance sheets relating to the unconsolidated joint ventures and partnerships (not just our proportionate share) are presented below as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	March 31, 2017		December 31, 2016
Total real estate, net	$	2,904,183	$	2,901,067
Cash and cash equivalents	28,676		32,503
Other assets	17,288		19,047
Total assets	$	2,950,147	$	2,952,617
Amount due to/(from) UDR	$	2,746	$	521
Third party debt, net	1,811,490		1,794,379
Accounts payable and accrued liabilities	55,471		66,391
Total liabilities	$	1,869,707	$	1,861,291
Total equity	$	1,080,440	$	1,091,326

Combined summary financial information relating to the unconsolidated joint ventures’ and partnerships’ operations (not just our proportionate share) is presented below for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

	Three Months Ended
	March 31,
	2017			2016
Total revenues	$	58,524		$	55,037
Property operating expenses	(21,834		)	(23,413		)
Real estate depreciation and amortization	(23,333		)	(18,943		)
Operating income/(loss)	13,357			12,681
Interest expense	(17,690		)	(16,181		)
Net income/(loss)	$	(4,333	)	$	(3,500	)

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Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) Unconsolidated Entities (UNITED DOMINION REALTY, L.P.)

3 Months Ended

Mar. 31, 2017

Schedule of Equity Method Investments [Line Items]

Equity Method Investments and Joint Ventures Disclosure [Text Block]

JOINT VENTURES AND PARTNERSHIPS

UDR has entered into joint ventures and partnerships with unrelated third parties to acquire real estate assets that are either consolidated and included in Real estate owned on the Consolidated Balance Sheets or are accounted for under the equity method of accounting, and are included in Investment in and advances to unconsolidated joint ventures, net, on the Consolidated Balance Sheets. The Company consolidates the entities that we control as well as any variable interest entity where we are the primary beneficiary. In addition, the Company consolidates any joint venture or partnership in which we are the general partner or managing member and the third party does not have the ability to substantively participate in the decision-making process nor the ability to remove us as general partner or managing member without cause.

UDR’s joint ventures and partnerships are funded with a combination of debt and equity. Our losses are limited to our investment and except as noted below, the Company does not guarantee any debt, capital payout or other obligations associated with our joint ventures and partnerships.

The Company recognizes earnings or losses from our investments in unconsolidated joint ventures and partnerships consisting of our proportionate share of the net earnings or losses of the joint ventures and partnerships. In addition, we may earn fees for providing management services to the unconsolidated joint ventures and partnerships.

The following table summarizes the Company’s investment in and advances to unconsolidated joint ventures and partnerships, net, which are accounted for under the equity method of accounting as of March 31, 2017 and December 31, 2016(dollars in thousands):

Joint Venture	Location of Properties	Number of Properties	Number of Apartment Homes	Investment at				UDR’s Ownership Interest
		March 31, 2017	March 31, 2017	March 31, 2017		December 31, 2016		March 31, 2017			December 31, 2016
Operating and development:
UDR/MetLife I	Los Angeles, CA	1 development community (a)	150	$	29,182	$	25,209	50.0		%	50.0		%
UDR/MetLife II (b)	Various	18 operating communities	4,059	309,409		311,282		50.0		%	50.0		%
Other UDR/MetLife Development Joint Ventures		1 operating community;
	Various	4 development communities (a)	1,437	156,096		160,979		50.6		%	50.6		%
UDR/MetLife Vitruvian Park®	Addison, TX	3 operating communities;
		1 development community (a);
		5 land parcels	1,513	73,154		72,414		50.0		%	50.0		%
UDR/KFH	Washington, D.C.	3 operating communities	660	11,801		12,835		30.0		%	30.0		%
Investment in and advances to unconsolidated joint ventures, net, before participating loan investment and preferred equity investment				$	579,642	$	582,719
								Income from investments for the three months ending March 31,
				Investment at
	Location	Rate	Years To Maturity	March 31, 2017		December 31, 2016		2017			2016
Participating loan investment:
Steele Creek	Denver, CO	6.5%	0.3	$	94,002	$	94,003	$	1,533		$	1,519
Preferred equity investment:
West Coast Development Joint Ventures (c)	Various	6.5% (c)	N/A	145,346		150,303		$	12,766		$	1,427
Total investment in and advances to unconsolidated joint ventures, net				$	818,990	$	827,025

(a) The number of apartment homes for the communities under development presented in the table above is based on the projected number of total homes upon completion of development. As of March 31, 2017, 1,018 apartment homes had been completed in Other UDR/MetLife Development Joint Ventures, and no apartment homes had been completed in UDR/MetLife I or in UDR/MetLife Vitruvian Park^®.

(b) In September 2015, the 717 Olympic community, which is owned by the UDR/MetLife II joint venture, experienced extensive water damage due to a ruptured water pipe. For the three months endedMarch 31, 2017 and 2016, the Company recorded casualty-related charges/(recoveries) of $0.9 million and $(1.1) million, respectively, representing its proportionate share of the total charges/(recoveries) recognized.

(c) In May 2015, the Company entered into a joint venture agreement with an unaffiliated joint venture partner and agreed to pay $136.3 million for a 48% ownership interest in a portfolio of five communities that were under construction. The communities are located in three of the Company’s core, coastal markets: Seattle, Washington, Los Angeles and Orange County, California. UDR earns a 6.5% preferred return on its investment through each individual community’s date of stabilization, defined as when a community reaches 80% occupancy for 90 consecutive days, while the joint venture partner is allocated all operating income and expense during the pre-stabilization period. Upon stabilization, income and expense are shared based on each partner’s ownership percentage and the Company no longer receives a 6.5% preferred return on its investment in the stabilized community. The Company serves as property manager and earns a management fee during the lease-up phase and subsequent operation of each of the communities. The unaffiliated joint venture partner is the general partner of the joint venture and the developer of the communities.

At inception of the agreement, the Company had a fixed-price option to acquire the remaining interest in each community beginning one year after completion. If the options are exercised for all five communities, the Company’s total purchase price will be $597.4 million. In the event the Company does not exercise its options to purchase at least two communities, the unaffiliated joint venture partner will be entitled to earn a contingent disposition fee equal to a 6.5% return on its implied equity in the communities not acquired. The unaffiliated joint venture partner is providing certain guaranties and there are construction loans on all five communities.

During the three months endedMarch 31, 2017, the Company exercised its fixed-price option to purchase the joint venture partner’s ownership interest in one of the five communities, a 244 home operating community in Seattle, Washington, thereby increasing its ownership interest from 49% to 100%, for a cash purchase price of approximately $66.0 million. As a result, the Company consolidated the operating community and it is no longer accounted for as a preferred equity investment in an unconsolidated joint venture (see Note 4, Real Estate Owned). As a result of the consolidation, the Company recorded a gain on consolidation of $12.2 million, which is included in Income/(loss) from unconsolidated entities on the Consolidated Statements of Operations.

As of March 31, 2017, construction was completed on three of the four remaining communities. Two of the four remaining communities had achieved stabilization. The other two remaining communities have not achieved stabilization and the Company continues to receive a 6.5% preferred return on its investment in those communities.

In March 2017, the Company entered into an additional joint venture agreement with the unaffiliated joint venture partner and agreed to pay $15.5 million for a 49% ownership interest in a 155 home community that is currently under construction in Seattle, Washington (together with the May 2015 joint venture described above, the “West Coast Development Joint Ventures”). Consistent with the terms of the May 2015 joint venture agreement, UDR earns a 6.5% preferred return on its investment through the community’s date of stabilization, as defined above, while our joint venture partner is allocated all operating income and expense during the pre-stabilization period. Upon stabilization, income and expense will be shared based on each partner’s ownership percentage and the Company will no longer receive a 6.5% preferred return on its investment in the stabilized community. The Company will serve as property manager and will earn a management fee during the lease-up phase and subsequent operation of the community. The unaffiliated joint venture partner is the general partner and the developer of the community. The Company has concluded it does not control the joint venture and accounts for it under the equity method of accounting.

The Company has a fixed-price option to acquire the remaining interest in the community beginning one year after completion for a total price of $61.3 million. The unaffiliated joint venture partner is providing certain guaranties and there is a construction loan on the community.

The Company's recorded equity investment in the West Coast Development Joint Ventures at March 31, 2017 and December 31, 2016 of $145.3 million and $150.3 million, respectively, is inclusive of outside basis costs and our accrued but unpaid preferred return.

As of March 31, 2017 and December 31, 2016, the Company had deferred fees and deferred profit of $9.7 million and $9.5 million, respectively, which will be recognized through earnings over the weighted average life of the related properties, upon the disposition of the properties to a third party, or upon completion of certain development obligations.

The Company recognized management fees of $2.6 million and $2.8 million for the three months endedMarch 31, 2017 and 2016, respectively, for our management of the communities held by the joint ventures and partnerships. The management fees are included in Joint venture management and other fees on the Consolidated Statements of Operations.

The Company may, in the future, make additional capital contributions to certain of our joint ventures and partnerships should additional capital contributions be necessary to fund acquisitions or operations.

We evaluate our investments in unconsolidated joint ventures and partnerships when events or changes in circumstances indicate that there may be an other-than-temporary decline in value. We consider various factors to determine if a decrease in the value of the investment is other-than-temporary. The Company did not recognize any other-than-temporary decreases in the value of its investments in unconsolidated joint ventures or partnerships during the three months endedMarch 31, 2017 and 2016.

Combined summary balance sheets relating to the unconsolidated joint ventures and partnerships (not just our proportionate share) are presented below as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	March 31, 2017		December 31, 2016
Total real estate, net	$	2,904,183	$	2,901,067
Cash and cash equivalents	28,676		32,503
Other assets	17,288		19,047
Total assets	$	2,950,147	$	2,952,617
Amount due to/(from) UDR	$	2,746	$	521
Third party debt, net	1,811,490		1,794,379
Accounts payable and accrued liabilities	55,471		66,391
Total liabilities	$	1,869,707	$	1,861,291
Total equity	$	1,080,440	$	1,091,326

Combined summary financial information relating to the unconsolidated joint ventures’ and partnerships’ operations (not just our proportionate share) is presented below for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

	Three Months Ended
	March 31,
	2017			2016
Total revenues	$	58,524		$	55,037
Property operating expenses	(21,834		)	(23,413		)
Real estate depreciation and amortization	(23,333		)	(18,943		)
Operating income/(loss)	13,357			12,681
Interest expense	(17,690		)	(16,181		)
Net income/(loss)	$	(4,333	)	$	(3,500	)

United Dominion Reality L.P. [Member]

Schedule of Equity Method Investments [Line Items]

Equity Method Investments and Joint Ventures Disclosure [Text Block]

UNCONSOLIDATED ENTITIES

The DownREIT Partnership is accounted for by the Operating Partnership under the equity method of accounting and is included in Investment in unconsolidated entities on the Consolidated Balance Sheets. The Operating Partnership recognizes earnings or losses from its investments in unconsolidated entities consisting of our proportionate share of the net earnings or losses of the partnership in accordance with the Partnership Agreement.

The DownREIT Partnership is a VIE as the limited partners lack substantive kick-out rights and substantive participating rights. The Operating Partnership is not the primary beneficiary of the DownREIT Partnership as it lacks the power to direct the activities that most significantly impact its economic performance and will continue to account for its interest as an equity method investment. See Note 2, Significant Accounting Policies.

As of March 31, 2017, the DownREIT Partnership owned 13 communities with 6,261 apartment homes. The Operating Partnership’s investment in the DownREIT Partnership was $103.3 million and $112.9 million as of March 31, 2017 and December 31, 2016, respectively.

Combined summary balance sheets relating to all of the DownREIT Partnership (not just our proportionate share) are presented below as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	March 31, 2017		December 31, 2016
Total real estate, net	$	1,400,046	$	1,413,983
Cash and cash equivalents	35		66
Note receivable from the General Partner	126,500		126,500
Other assets	4,498		4,843
Total assets	$	1,531,079	$	1,545,392
Secured debt, net	442,172		443,607
Other liabilities	23,976		27,571
Total liabilities	466,148		471,178
Total capital	1,064,931		1,074,214
Total liabilities and capital	$	1,531,079	$	1,545,392

Combined summary financial information relating to all of the DownREIT Partnership (not just our proportionate share) is presented below for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

	Three Months Ended
	March 31,
	2017			2016
Rental income	$	33,298		$	31,617
Property operating expenses	(13,976		)	(14,269		)
Real estate depreciation and amortization	(20,608		)	(30,053		)
Operating income/(loss)	(1,286		)	(12,705		)
Interest expense	(3,860		)	(3,741		)
Interest income on note receivable from the General Partner	1,166			1,180
Net income/(loss)	$	(3,980	)	$	(15,266	)

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Secured and Unsecured Debt

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Debt Disclosure [Text Block]

SECURED AND UNSECURED DEBT, NET

The following is a summary of our secured and unsecured debt at March 31, 2017 and December 31, 2016 (dollars in thousands):

							Three Months Ended
	Principal Outstanding						March 31, 2017
	March 31, 2017			December 31, 2016			Weighted Average Interest Rate		Weighted Average Years to Maturity	Number of Communities Encumbered
Secured Debt:
Fixed Rate Debt
Mortgage notes payable (a)	$	401,135		$	402,996		4.04	%	6.1	7
Fannie Mae credit facilities (b)	355,836			355,836			5.06	%	2.6	10
Deferred financing costs	(2,482		)	(2,681		)
Total fixed rate secured debt, net	754,489			756,151			4.53	%	4.4	17
Variable Rate Debt
Tax-exempt secured notes payable (c)	94,700			94,700			1.42	%	5.9	2
Fannie Mae credit facilities (b)	182,606			280,946			2.05	%	1.3	5
Deferred financing costs	(288		)	(939		)
Total variable rate secured debt, net	277,018			374,707			1.84	%	2.9	7
Total Secured Debt, net	1,031,507			1,130,858			3.80	%	4.0	24
Unsecured Debt:
Variable Rate Debt
Borrowings outstanding under unsecured credit facility due January 2020 (d) (h)	—			—			—	%	2.8
Borrowings outstanding under unsecured commercial paper program due April 2017 (e) (h)	220,000			—			1.24	%	0.0
Borrowings outstanding under unsecured working capital credit facility due January 2019 (f)	36,140			21,350			1.88	%	1.8
Term Loan Facility due January 2021 (d) (h)	35,000			35,000			1.73	%	3.8
Fixed Rate Debt
4.25% Medium-Term Notes due June 2018 (net of discounts of $501 and $608, respectively) (h)	299,499			299,392			4.25	%	1.2
3.70% Medium-Term Notes due October 2020 (net of discounts of $28 and $30, respectively) (h)	299,972			299,970			3.70	%	3.5
2.34% Term Loan Facility due January 2021 (d) (h)	315,000			315,000			2.34	%	3.8
4.63% Medium-Term Notes due January 2022 (net of discounts of $1,715 and $1,805 respectively) (h)	398,285			398,195			4.63	%	4.8
3.75% Medium-Term Notes due July 2024 (net of discounts of $756 and $782, respectively) (h)	299,244			299,218			3.75	%	7.3
8.50% Debentures due September 2024	15,644			15,644			8.50	%	7.5
4.00% Medium-Term Notes due October 2025 (net of discounts of $585 and $602, respectively) (g) (h)	299,415			299,398			4.00	%	8.5
2.95% Medium-Term Notes due September 2026 (h)	300,000			300,000			2.95	%	9.4
Other	21			21
Deferred financing costs	(12,435		)	(12,568		)
Total Unsecured Debt, net	2,505,785			2,270,620			3.52	%	4.9
Total Debt, net	$	3,537,292		$	3,401,478		3.67	%	4.6

For purposes of classification of the above table, variable rate debt with a derivative financial instrument designated as a cash flow hedge is deemed as fixed rate debt due to the Company having effectively established a fixed interest rate for the underlying debt instrument.

Our secured debt instruments generally feature either monthly interest and principal or monthly interest-only payments with balloon payments due at maturity. As of March 31, 2017, secured debt encumbered $1.9 billion or 19.7% of UDR’s total real estate owned based upon gross book value ($7.9 billion or 80.3% of UDR’s real estate owned based on gross book value is unencumbered).

(a) At March 31, 2017, fixed rate mortgage notes payable are generally due in monthly installments of principal and interest and mature at various dates from May 2019 through November 2026 and carry interest rates ranging from 3.15% to 5.86%.

The Company will from time to time acquire properties subject to fixed rate debt instruments. In those situations, the Company records the debt at its estimated fair value and amortizes any difference between the fair value and par value to interest expense over the life of the underlying debt instrument.

During the three months endedMarch 31, 2017 and 2016, the Company had $0.7 million and $0.8 million, respectively, of amortization of the fair market adjustment of debt assumed in the acquisition of properties, which was included in Interest expenseon the Consolidated Statements of Operations. The unamortized fair market adjustment was a net premium of $10.4 million and $11.2 million at March 31, 2017 and December 31, 2016, respectively.

(b) UDR had three secured credit facilities with Fannie Mae with an aggregate commitment of $538.4 million at March 31, 2017. The Fannie Mae credit facilities mature at various dates from May 2017 through July 2020 and bear interest at floating and fixed rates. At March 31, 2017, $355.8 million of the outstanding balance was fixed and had a weighted average interest rate of 5.06% and the remaining balance of $182.6 million had a weighted average variable interest rate of 2.05%. During the three months endedMarch 31, 2017, the Company prepaid $98.3 million of its secured credit facilities with borrowings under the Company's unsecured commercial paper program.

Further information related to these credit facilities is as follows (dollars in thousands):

	March 31, 2017			December 31, 2016
Borrowings outstanding	$	538,442		$	636,782
Weighted average borrowings during the period ended	604,002			737,802
Maximum daily borrowings during the period ended	636,782			813,544
Weighted average interest rate during the period ended	3.9		%	3.9		%
Weighted average interest rate at the end of the period	4.0		%	3.8		%

(c) The variable rate mortgage notes payable that secure tax-exempt housing bond issues mature in August 2019 and March 2032. Interest on these notes is payable in monthly installments. The variable rate mortgage notes have interest rates ranging from 1.39% to 1.44% as of March 31, 2017.

(d) The Company has a $1.1 billion unsecured revolving credit facility (the “Revolving Credit Facility”) and a $350.0 million unsecured term loan facility (the “Term Loan Facility”). The credit agreement for these facilities (the "Credit Agreement") allows the total commitments under the Revolving Credit Facility and the total borrowings under the Term Loan Facility to be increased to an aggregate maximum amount of up to $2.0 billion, subject to certain conditions, including obtaining commitments from any one or more lenders. The Revolving Credit Facility has a scheduled maturity date of January 31, 2020, with twosix-month extension options, subject to certain conditions. The Term Loan Facility has a scheduled maturity date of January 29, 2021.     

Based on the Company’s current credit rating, the Revolving Credit Facility has an interest rate equal to LIBOR plus a margin of 90 basis points and a facility fee of 15 basis points, and the Term Loan Facility has an interest rate equal to LIBOR plus a margin of 95 basis points. Depending on the Company’s credit rating, the margin under the Revolving Credit Facility ranges from 85 to 155 basis points, the facility fee ranges from 12.5 to 30 basis points, and the margin under the Term Loan Facility ranges from 90 to 175 basis points.

The Credit Agreement contains customary representations and warranties and financial and other affirmative and negative covenants. The Credit Agreement also includes customary events of default, in certain cases subject to customary periods to cure. The occurrence of an event of default, following the applicable cure period, would permit the lenders to, among other things, declare the unpaid principal, accrued and unpaid interest and all other amounts payable under the Credit Agreement to be immediately due and payable.

The following is a summary of short-term bank borrowings under the Revolving Credit Facility at March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Total revolving credit facility	$	1,100,000		$	1,100,000
Borrowings outstanding at end of period (1)	—			—
Weighted average daily borrowings during the period ended	9,222			161,505
Maximum daily borrowings during the period ended	120,000			340,000
Weighted average interest rate during the period ended	1.6		%	1.4		%
Interest rate at end of the period	—		%	—		%

(1) Excludes $2.9 million and $2.9 million of letters of credit at March 31, 2017 and December 31, 2016, respectively.

(e) On January 23, 2017, the Company entered into an unsecured commercial paper program. Under the terms of the program, the Company may issue unsecured commercial paper up to a maximum aggregate amount outstanding of $500 million. The notes are sold under customary terms in the United States commercial paper market and rank pari passu with all of the Company’s other unsecured indebtedness. The notes are fully and unconditionally guaranteed by the Operating Partnership.

The following is a summary of short-term bank borrowings under the unsecured commercial paper program at March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Total unsecured commercial paper program	$	500,000		$	—
Borrowings outstanding at end of period	220,000			—
Weighted average daily borrowings during the period ended	80,228			—
Maximum daily borrowings during the period ended	220,000			—
Weighted average interest rate during the period ended	1.2		%	—		%
Interest rate at end of the period	1.2		%	—		%

(f) The Company has a working capital credit facility, which provides for a $75 million unsecured revolving credit facility (the “Working Capital Credit Facility”) with a scheduled maturity date of January 1, 2019. Based on the Company’s current credit rating, the Working Capital Credit Facility has an interest rate equal to LIBOR plus a margin of 90 basis points. Depending on the Company’s credit rating, the margin ranges from 85 to 155 basis points.

The following is a summary of short-term bank borrowings under the Working Capital Credit Facility at March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Total revolving working capital credit facility	$	75,000		$	75,000
Borrowings outstanding at end of period	36,140			21,350
Weighted average daily borrowings during the period ended	26,714			21,936
Maximum daily borrowings during the period ended	67,799			69,633
Weighted average interest rate during the period ended	1.7		%	1.4		%
Interest rate at end of the period	1.9		%	1.7		%

(g) The Company previously entered into forward starting interest rate swaps to hedge against interest rate risk on $200 million of this debt. The all-in weighted average interest rate, inclusive of the impact of these interest rate swaps, was 4.55%.

(h) The Operating Partnership is a guarantor of this debt.

The aggregate maturities, including amortizing principal payments of unsecured and secured debt, of total debt for the next ten calendar years subsequent to March 31, 2017 are as follows (dollars in thousands):

Year	Total Fixed Secured Debt		Total Variable Secured Debt			Total Secured Debt		Total Unsecured Debt			Total Debt
2017	$	3,310	$	46,568		$	49,878	$	220,000		$	269,878
2018	74,637		136,038			210,675		300,000			510,675
2019	249,395		67,700			317,095		36,140			353,235
2020	198,076		—			198,076		300,000			498,076
2021	1,117		—			1,117		350,000			351,117
2022	1,157		—			1,157		400,000			401,157
2023	41,245		—			41,245		—			41,245
2024	—		—			—		315,644			315,644
2025	127,600		—			127,600		300,000			427,600
2026	50,000		—			50,000		300,000			350,000
Thereafter	—		27,000			27,000		—			27,000
Subtotal	746,537		277,306			1,023,843		2,521,784			3,545,627
Non-cash (a)	7,952		(288		)	7,664		(15,999		)	(8,335		)
Total	$	754,489	$	277,018		$	1,031,507	$	2,505,785		$	3,537,292

(a) Includes the unamortized balance of fair market value adjustments, premiums/discounts and deferred financing costs. For the three months endedMarch 31, 2017 and 2016, the Company amortized $1.1 million and $1.3 million, respectively, of deferred financing costs into Interest expense.

We were in compliance with the covenants of our debt instruments at March 31, 2017.

XML

Debt (UNITED DOMINION REALTY, L.P.)

3 Months Ended

Mar. 31, 2017

Entity Information [Line Items]

DEBT

SECURED AND UNSECURED DEBT, NET

The following is a summary of our secured and unsecured debt at March 31, 2017 and December 31, 2016 (dollars in thousands):

							Three Months Ended
	Principal Outstanding						March 31, 2017
	March 31, 2017			December 31, 2016			Weighted Average Interest Rate		Weighted Average Years to Maturity	Number of Communities Encumbered
Secured Debt:
Fixed Rate Debt
Mortgage notes payable (a)	$	401,135		$	402,996		4.04	%	6.1	7
Fannie Mae credit facilities (b)	355,836			355,836			5.06	%	2.6	10
Deferred financing costs	(2,482		)	(2,681		)
Total fixed rate secured debt, net	754,489			756,151			4.53	%	4.4	17
Variable Rate Debt
Tax-exempt secured notes payable (c)	94,700			94,700			1.42	%	5.9	2
Fannie Mae credit facilities (b)	182,606			280,946			2.05	%	1.3	5
Deferred financing costs	(288		)	(939		)
Total variable rate secured debt, net	277,018			374,707			1.84	%	2.9	7
Total Secured Debt, net	1,031,507			1,130,858			3.80	%	4.0	24
Unsecured Debt:
Variable Rate Debt
Borrowings outstanding under unsecured credit facility due January 2020 (d) (h)	—			—			—	%	2.8
Borrowings outstanding under unsecured commercial paper program due April 2017 (e) (h)	220,000			—			1.24	%	0.0
Borrowings outstanding under unsecured working capital credit facility due January 2019 (f)	36,140			21,350			1.88	%	1.8
Term Loan Facility due January 2021 (d) (h)	35,000			35,000			1.73	%	3.8
Fixed Rate Debt
4.25% Medium-Term Notes due June 2018 (net of discounts of $501 and $608, respectively) (h)	299,499			299,392			4.25	%	1.2
3.70% Medium-Term Notes due October 2020 (net of discounts of $28 and $30, respectively) (h)	299,972			299,970			3.70	%	3.5
2.34% Term Loan Facility due January 2021 (d) (h)	315,000			315,000			2.34	%	3.8
4.63% Medium-Term Notes due January 2022 (net of discounts of $1,715 and $1,805 respectively) (h)	398,285			398,195			4.63	%	4.8
3.75% Medium-Term Notes due July 2024 (net of discounts of $756 and $782, respectively) (h)	299,244			299,218			3.75	%	7.3
8.50% Debentures due September 2024	15,644			15,644			8.50	%	7.5
4.00% Medium-Term Notes due October 2025 (net of discounts of $585 and $602, respectively) (g) (h)	299,415			299,398			4.00	%	8.5
2.95% Medium-Term Notes due September 2026 (h)	300,000			300,000			2.95	%	9.4
Other	21			21
Deferred financing costs	(12,435		)	(12,568		)
Total Unsecured Debt, net	2,505,785			2,270,620			3.52	%	4.9
Total Debt, net	$	3,537,292		$	3,401,478		3.67	%	4.6

For purposes of classification of the above table, variable rate debt with a derivative financial instrument designated as a cash flow hedge is deemed as fixed rate debt due to the Company having effectively established a fixed interest rate for the underlying debt instrument.

Our secured debt instruments generally feature either monthly interest and principal or monthly interest-only payments with balloon payments due at maturity. As of March 31, 2017, secured debt encumbered $1.9 billion or 19.7% of UDR’s total real estate owned based upon gross book value ($7.9 billion or 80.3% of UDR’s real estate owned based on gross book value is unencumbered).

(a) At March 31, 2017, fixed rate mortgage notes payable are generally due in monthly installments of principal and interest and mature at various dates from May 2019 through November 2026 and carry interest rates ranging from 3.15% to 5.86%.

The Company will from time to time acquire properties subject to fixed rate debt instruments. In those situations, the Company records the debt at its estimated fair value and amortizes any difference between the fair value and par value to interest expense over the life of the underlying debt instrument.

During the three months endedMarch 31, 2017 and 2016, the Company had $0.7 million and $0.8 million, respectively, of amortization of the fair market adjustment of debt assumed in the acquisition of properties, which was included in Interest expenseon the Consolidated Statements of Operations. The unamortized fair market adjustment was a net premium of $10.4 million and $11.2 million at March 31, 2017 and December 31, 2016, respectively.

(b) UDR had three secured credit facilities with Fannie Mae with an aggregate commitment of $538.4 million at March 31, 2017. The Fannie Mae credit facilities mature at various dates from May 2017 through July 2020 and bear interest at floating and fixed rates. At March 31, 2017, $355.8 million of the outstanding balance was fixed and had a weighted average interest rate of 5.06% and the remaining balance of $182.6 million had a weighted average variable interest rate of 2.05%. During the three months endedMarch 31, 2017, the Company prepaid $98.3 million of its secured credit facilities with borrowings under the Company's unsecured commercial paper program.

Further information related to these credit facilities is as follows (dollars in thousands):

	March 31, 2017			December 31, 2016
Borrowings outstanding	$	538,442		$	636,782
Weighted average borrowings during the period ended	604,002			737,802
Maximum daily borrowings during the period ended	636,782			813,544
Weighted average interest rate during the period ended	3.9		%	3.9		%
Weighted average interest rate at the end of the period	4.0		%	3.8		%

(c) The variable rate mortgage notes payable that secure tax-exempt housing bond issues mature in August 2019 and March 2032. Interest on these notes is payable in monthly installments. The variable rate mortgage notes have interest rates ranging from 1.39% to 1.44% as of March 31, 2017.

(d) The Company has a $1.1 billion unsecured revolving credit facility (the “Revolving Credit Facility”) and a $350.0 million unsecured term loan facility (the “Term Loan Facility”). The credit agreement for these facilities (the "Credit Agreement") allows the total commitments under the Revolving Credit Facility and the total borrowings under the Term Loan Facility to be increased to an aggregate maximum amount of up to $2.0 billion, subject to certain conditions, including obtaining commitments from any one or more lenders. The Revolving Credit Facility has a scheduled maturity date of January 31, 2020, with twosix-month extension options, subject to certain conditions. The Term Loan Facility has a scheduled maturity date of January 29, 2021.     

Based on the Company’s current credit rating, the Revolving Credit Facility has an interest rate equal to LIBOR plus a margin of 90 basis points and a facility fee of 15 basis points, and the Term Loan Facility has an interest rate equal to LIBOR plus a margin of 95 basis points. Depending on the Company’s credit rating, the margin under the Revolving Credit Facility ranges from 85 to 155 basis points, the facility fee ranges from 12.5 to 30 basis points, and the margin under the Term Loan Facility ranges from 90 to 175 basis points.

The Credit Agreement contains customary representations and warranties and financial and other affirmative and negative covenants. The Credit Agreement also includes customary events of default, in certain cases subject to customary periods to cure. The occurrence of an event of default, following the applicable cure period, would permit the lenders to, among other things, declare the unpaid principal, accrued and unpaid interest and all other amounts payable under the Credit Agreement to be immediately due and payable.

The following is a summary of short-term bank borrowings under the Revolving Credit Facility at March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Total revolving credit facility	$	1,100,000		$	1,100,000
Borrowings outstanding at end of period (1)	—			—
Weighted average daily borrowings during the period ended	9,222			161,505
Maximum daily borrowings during the period ended	120,000			340,000
Weighted average interest rate during the period ended	1.6		%	1.4		%
Interest rate at end of the period	—		%	—		%

(1) Excludes $2.9 million and $2.9 million of letters of credit at March 31, 2017 and December 31, 2016, respectively.

(e) On January 23, 2017, the Company entered into an unsecured commercial paper program. Under the terms of the program, the Company may issue unsecured commercial paper up to a maximum aggregate amount outstanding of $500 million. The notes are sold under customary terms in the United States commercial paper market and rank pari passu with all of the Company’s other unsecured indebtedness. The notes are fully and unconditionally guaranteed by the Operating Partnership.

The following is a summary of short-term bank borrowings under the unsecured commercial paper program at March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Total unsecured commercial paper program	$	500,000		$	—
Borrowings outstanding at end of period	220,000			—
Weighted average daily borrowings during the period ended	80,228			—
Maximum daily borrowings during the period ended	220,000			—
Weighted average interest rate during the period ended	1.2		%	—		%
Interest rate at end of the period	1.2		%	—		%

(f) The Company has a working capital credit facility, which provides for a $75 million unsecured revolving credit facility (the “Working Capital Credit Facility”) with a scheduled maturity date of January 1, 2019. Based on the Company’s current credit rating, the Working Capital Credit Facility has an interest rate equal to LIBOR plus a margin of 90 basis points. Depending on the Company’s credit rating, the margin ranges from 85 to 155 basis points.

The following is a summary of short-term bank borrowings under the Working Capital Credit Facility at March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Total revolving working capital credit facility	$	75,000		$	75,000
Borrowings outstanding at end of period	36,140			21,350
Weighted average daily borrowings during the period ended	26,714			21,936
Maximum daily borrowings during the period ended	67,799			69,633
Weighted average interest rate during the period ended	1.7		%	1.4		%
Interest rate at end of the period	1.9		%	1.7		%

(g) The Company previously entered into forward starting interest rate swaps to hedge against interest rate risk on $200 million of this debt. The all-in weighted average interest rate, inclusive of the impact of these interest rate swaps, was 4.55%.

(h) The Operating Partnership is a guarantor of this debt.

The aggregate maturities, including amortizing principal payments of unsecured and secured debt, of total debt for the next ten calendar years subsequent to March 31, 2017 are as follows (dollars in thousands):

Year	Total Fixed Secured Debt		Total Variable Secured Debt			Total Secured Debt		Total Unsecured Debt			Total Debt
2017	$	3,310	$	46,568		$	49,878	$	220,000		$	269,878
2018	74,637		136,038			210,675		300,000			510,675
2019	249,395		67,700			317,095		36,140			353,235
2020	198,076		—			198,076		300,000			498,076
2021	1,117		—			1,117		350,000			351,117
2022	1,157		—			1,157		400,000			401,157
2023	41,245		—			41,245		—			41,245
2024	—		—			—		315,644			315,644
2025	127,600		—			127,600		300,000			427,600
2026	50,000		—			50,000		300,000			350,000
Thereafter	—		27,000			27,000		—			27,000
Subtotal	746,537		277,306			1,023,843		2,521,784			3,545,627
Non-cash (a)	7,952		(288		)	7,664		(15,999		)	(8,335		)
Total	$	754,489	$	277,018		$	1,031,507	$	2,505,785		$	3,537,292

(a) Includes the unamortized balance of fair market value adjustments, premiums/discounts and deferred financing costs. For the three months endedMarch 31, 2017 and 2016, the Company amortized $1.1 million and $1.3 million, respectively, of deferred financing costs into Interest expense.

We were in compliance with the covenants of our debt instruments at March 31, 2017.

United Dominion Reality L.P. [Member]

Entity Information [Line Items]

DEBT

DEBT, NET

Our secured debt instruments generally feature either monthly interest and principal or monthly interest-only payments with balloon payments due at maturity. For purposes of classification in the following table, variable rate debt with a derivative financial instrument designated as a cash flow hedge is deemed as fixed rate debt due to the Operating Partnership having effectively established the fixed interest rate for the underlying debt instrument. Secured debt consists of the following as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	Principal Outstanding						For the Three Months Ended March 31, 2017
	March 31, 2017			December 31, 2016			Weighted Average Interest Rate		Weighted Average Years to Maturity	Number of Communities Encumbered
Fixed Rate Debt
Fannie Mae credit facilities	$	228,870		$	244,912		5.07	%	2.6	6
Deferred financing costs	(718		)	(1,070		)
Total fixed rate secured debt, net	228,152			243,842			5.07	%	2.6	6
Variable Rate Debt
Tax-exempt secured note payable	27,000			27,000			1.39	%	15.0	1
Fannie Mae credit facilities	81,339			163,637			2.34	%	1.7	2
Deferred financing costs	(251		)	(505		)
Total variable rate secured debt, net	108,088			190,132			2.10	%	5.0	3
Total Secured Debt, net	$	336,240		$	433,974		4.26	%	3.4	9

As of March 31, 2017, an aggregate commitment of $310.2 million of the General Partner's secured credit facilities with Fannie Mae was owed by the Operating Partnership based on the ownership of the assets securing the debt. The entire commitment was outstanding at March 31, 2017. The portions of the Fannie Mae credit facilities owed by the Operating Partnership mature at various dates from December 2018 through July 2020 and bear interest at floating and fixed rates. At March 31, 2017, $228.9 million of the outstanding balance was fixed and had a weighted average interest rate of 5.07% and the remaining balance of $81.3 million on these facilities had a weighted average variable interest rate of 2.34%.

The following information relates to the credit facilities owed by the Operating Partnership (dollars in thousands):

	March 31, 2017			December 31, 2016
Borrowings outstanding	$	310,209		$	408,549
Weighted average borrowings during the period ended	375,770			414,759
Maximum daily borrowings during the period ended	408,549			421,001
Weighted average interest rate during the period ended	4.1		%	3.9		%
Interest rate at the end of the period	4.4		%	4.0		%

The Operating Partnership may from time to time acquire properties subject to fixed rate debt instruments. In those situations, management will record the secured debt at its estimated fair value and amortize any difference between the fair value and par to interest expense over the life of the underlying debt instrument. The Operating Partnership did not have any unamortized fair value adjustments associated with the fixed rate debt instruments on the Operating Partnership’s properties.

Fixed Rate Debt

At March 31, 2017, the General Partner had borrowings against its fixed rate facilities of $355.8 million, of which $228.9 million was owed by the Operating Partnership based on the ownership of the assets securing the debt. As of March 31, 2017, the fixed rate Fannie Mae credit facilities owed by the Operating Partnership had a weighted average fixed interest rate of 5.07%.

Variable Rate Debt

Tax-exempt secured note payable. The variable rate mortgage note payable that secures tax-exempt housing bond issues matures March 2032. Interest on this note is payable in monthly installments. The mortgage note payable has an interest rate of 1.39% as of March 31, 2017.

Secured credit facilities. At March 31, 2017, the General Partner had borrowings against its variable rate facilities of $182.6 million, of which $81.3 million was owed by the Operating Partnership based on the ownership of the assets securing the debt. As of March 31, 2017, the variable rate borrowings under the Fannie Mae credit facilities owed by the Operating Partnership had a weighted average floating interest rate of 2.34%.

The aggregate maturities of the Operating Partnership’s secured debt due during each of the next ten calendar years subsequent to March 31, 2017 are as follows (dollars in thousands):

	Fixed			Variable
Year	Secured Credit Facilities			Tax-Exempt Secured Notes Payable			Secured Credit Facilities			Total
2017	$	—		$	—		$	—		$	—
2018	41,854			—			81,339			123,193
2019	133,204			—			—			133,204
2020	53,812			—			—			53,812
2021	—			—			—			—
2022	—			—			—			—
2023	—			—			—			—
2024	—			—			—			—
2025	—			—			—			—
2026	—			—			—			—
Thereafter	—			27,000			—			27,000
Subtotal	228,870			27,000			81,339			337,209
Non-cash (a)	(718		)	(84		)	(167		)	(969		)
Total	$	228,152		$	26,916		$	81,172		$	336,240

(a) Includes the unamortized balance of fair market value adjustments, premiums/discounts, deferred hedge gains, and deferred financing costs. For the three months endedMarch 31, 2017 and 2016, the Operating Partnership amortized $0.1 million and $0.2 million, respectively, of deferred financing costs into Interest expense.

Guarantor on Unsecured Debt

The Operating Partnership is a guarantor on the General Partner’s unsecured revolving credit facility with an aggregate borrowing capacity of $1.1 billion and unsecured commercial paper program with an aggregate borrowing capacity of $500 million, $300 million of medium-term notes due June 2018, $300 million of medium-term notes due October 2020, a $350 million term loan facility due January 2021, $400 million of medium-term notes due January 2022, $300 million of medium-term notes due July 2024, $300 million of medium-term notes due October 2025 and $300 million of medium-term notes due September 2026. As of March 31, 2017 and December 31, 2016, the General Partner did not have an outstanding balance under the unsecured revolving credit facility

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Income/(Loss) Per Share

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

EARNINGS/(LOSS) PER SHARE

/(LOSS) PER SHARE

The following table sets forth the computation of basic and diluted income/(loss) per share for the periods presented (dollars and shares in thousands, except per share data):

	Three Months Ended
	March 31,
	2017			2016
Numerator for income/(loss) per share:
Income/(loss) from continuing operations	$	26,264		$	8,534
Gain/(loss) on sale of real estate owned, net of tax	2,132			3,070
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(2,338		)	(905		)
Net (income)/loss attributable to noncontrolling interests	(91		)	(306		)
Net income/(loss) attributable to UDR, Inc.	25,967			10,393
Distributions to preferred stockholders — Series E (Convertible)	(929		)	(929		)
Income/(loss) attributable to common stockholders - basic and diluted	$	25,038		$	9,464
Denominator for income/(loss) per share:
Weighted average common shares outstanding	267,402			263,355
Non-vested restricted stock awards	(612		)	(899		)
Denominator for basic income/(loss) per share	266,790			262,456
Incremental shares issuable from assumed conversion of stock options, unvested LTIP Units and unvested restricted stock	1,898			1,829
Denominator for diluted income/(loss) per share	268,688			264,285
Income/(loss) per weighted average common share:
Basic	$	0.09		$	0.04
Diluted	$	0.09		$	0.04

Basic income/(loss) per common share is computed based upon the weighted average number of common shares outstanding. Diluted income/(loss) per common share is computed based upon the weighted average number of common shares outstanding plus the common shares issuable from the assumed conversion of the OP Units and DownREIT Units, convertible preferred stock, stock options, unvested long-term incentive plan units ("LTIP Units") and unvested restricted stock. Only those instruments having a dilutive impact on our basic income/(loss) per share are included in diluted income/(loss) per share during the periods. For the three months endedMarch 31, 2017 and 2016, the effect of the conversion of the OP Units, DownREIT Units and convertible preferred stock was not dilutive and therefore not included in the above calculation.

The following table sets forth the additional shares of common stock outstanding by equity instrument if converted to common stock for each of the three months endedMarch 31, 2017 and 2016(shares in thousands):

	Three Months Ended
	March 31,
	2017	2016
OP/DownREIT Units	24,962	25,191
Convertible preferred stock	3,028	3,028
Stock options, unvested LTIP Units and unvested restricted stock	1,898	1,829

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Noncontrolling Interests

3 Months Ended

Mar. 31, 2017

Noncontrolling Interest [Abstract]

NONCONTROLLING INTERESTS

NONCONTROLLING INTERESTS

Redeemable Noncontrolling Interests in the Operating Partnership and DownREIT Partnership

Interests in the Operating Partnership and the DownREIT Partnership held by limited partners are represented by OP Units and DownREIT Units, respectively. The income is allocated to holders of OP Units/DownREIT Units based upon net income attributable to common stockholders and the weighted average number of OP Units/DownREIT Units outstanding to total common shares plus OP Units/DownREIT Units outstanding during the period. Capital contributions, distributions, and profits and losses are allocated to noncontrolling interests in accordance with the terms of the partnership agreements of the Operating Partnership and the DownREIT Partnership.

Limited partners of the Operating Partnership and the DownREIT Partnership have the right to require such partnership to redeem all or a portion of the OP Units/DownREIT Units held by the limited partner at a redemption price equal to and in the form of the Cash Amount (as defined in the partnership agreement of the Operating Partnership or the DownREIT Partnership, as applicable), provided that such OP Units/DownREIT Units have been outstanding for at least one year, subject to certain exceptions. UDR, as the general partner of the Operating Partnership and the DownREIT Partnership may, in its sole discretion, purchase the OP Units/DownREIT Units by paying to the limited partner either the Cash Amount or the REIT Share Amount (generally one share of common stock of the Company for each OP Unit/DownREIT Unit), as defined in the partnership agreement of the Operating Partnership or the DownREIT Partnership, as applicable. Accordingly, the Company records the OP Units/DownREIT Units outside of permanent equity and reports the OP Units/DownREIT Units at their redemption value using the Company’s stock price at each balance sheet date.

The following table sets forth redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership for the following period (dollars in thousands):

Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership, December 31, 2016	$	909,482
Mark-to-market adjustment to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	281
Conversion of OP Units/DownREIT Units to Common Stock	(1,850		)
Net income/(loss) attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	2,338
Distributions to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(7,919		)
Vesting of Long-Term Incentive Plan Units	2,317
Allocation of other comprehensive income/(loss)	129
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership, March 31, 2017	$	904,778

Noncontrolling Interests

Noncontrolling interests represent interests of unrelated partners and unvested LTIP Units in certain consolidated affiliates, and is presented as part of equity in the Consolidated Balance Sheets since these interests are not redeemable. During the three months endedMarch 31, 2017 and 2016, Net (income)/loss attributable to noncontrolling interests was $(0.1) million and $(0.3) million, respectively.

The Company grants LTIP Units to certain employees and non-employee directors. The LTIP Units represent an ownership interest in the Operating Partnership and have vesting terms of between one and three years, specific to the individual grants.

Noncontrolling interests related to long-term incentive plan units represent the unvested LTIP Units of these employees and non-employee directors in the Operating Partnership. The net income/(loss) allocated to the unvested LTIP Units is included in Net (income)/loss attributable to noncontrolling interests on the Consolidated Statements of Operations.

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Related Party Transactions (UNITED DOMINION REALTY, L.P.)

3 Months Ended

Mar. 31, 2017

United Dominion Reality L.P. [Member]

Entity Information [Line Items]

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS

Advances (To)/From the General Partner

The Operating Partnership participates in the General Partner’s central cash management program, wherein all the Operating Partnership’s cash receipts are remitted to the General Partner and all cash disbursements are funded by the General Partner. In addition, other miscellaneous costs such as administrative expenses are incurred by the General Partner on behalf of the Operating Partnership. As a result of these various transactions between the Operating Partnership and the General Partner, the Operating Partnership had net Advances (to)/from the General Partner of $114.4 million and $19.7 million at March 31, 2017 and December 31, 2016, respectively, which are reflected as increases/(decreases) of capital on the Consolidated Balance Sheets.

Allocation of General and Administrative Expenses

The General Partner shares various general and administrative costs, employees and other overhead costs with the Operating Partnership including legal assistance, acquisitions analysis, marketing, human resources, IT, accounting, rent, supplies and advertising, and allocates these costs to the Operating Partnership first on the basis of direct usage when identifiable, with the remainder allocated based on the reasonably anticipated benefits to the parties. The general and administrative expenses allocated to the Operating Partnership by UDR were $4.5 million and $4.6 million during the three months endedMarch 31, 2017 and 2016, respectively, and are included in General and administrative on the Consolidated Statements of Operations. In the opinion of management, this method of allocation reflects the level of services received by the Operating Partnership from the General Partner.

During the three months endedMarch 31, 2017 and 2016, the Operating Partnership reimbursed the General Partner $3.6 million and $3.6 million, respectively, for shared services related to corporate level property management costs incurred by the General Partner. These shared costs reimbursements and related party management fees are initially recorded within the line item General and administrative on the Consolidated Statements of Operations, and a portion related to management costs is reclassified to Property management on the Consolidated Statements of Operations. (See further discussion below.)

Shared Services/Management Fee

The Operating Partnership self-manages its own properties and is party to an Inter-Company Employee and Cost Sharing Agreement with the General Partner. This agreement provides for reimbursements to the General Partner for the Operating Partnership’s allocable share of costs incurred by the General Partner for (a) shared services of corporate level property management employees and related support functions and costs, and (b) general and administrative costs. As discussed above, the reimbursement for shared services is classified in Property management on the Consolidated Statements of Operations.

Notes Payable to the General Partner

As of both March 31, 2017 and December 31, 2016, the Operating Partnership had $273.3 million of unsecured notes payable to the General Partner at annual interest rates between 4.12% and 5.34%. Certain limited partners of the Operating Partnership have provided guarantees or reimbursement agreements related to these notes payable. The guarantees were provided by the limited partners in conjunction with their contribution of properties to the Operating Partnership. The notes mature on August 31, 2021, December 31, 2023 and April 1, 2026, and interest payments are made monthly. The Operating Partnership recognized interest expense on the notes payable of $3.1 million and $3.1 million during the three months endedMarch 31, 2017 and 2016, respectively.

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Fair Value of Derivatives and Financial Instruments

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS

FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS

Fair value is based on the price that would be received to sell an asset or the exit price that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three-level valuation hierarchy prioritizes observable and unobservable inputs used to measure fair value. The fair value hierarchy consists of three broad levels, which are described below:

• Level 1 — Quoted prices in active markets for identical assets or liabilities that the entity has the ability to access.

• Level 2 — Observable inputs other than prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated with observable market data.

• Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.

The estimated fair values of the Company’s financial instruments either recorded or disclosed on a recurring basis as of March 31, 2017 and December 31, 2016 are summarized as follows (dollars in thousands):

					Fair Value at March 31, 2017, Using
	Total Carrying Amount in Statement of Financial Position at March 31, 2017		Fair Value Estimate at March 31, 2017		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Description:
Notes receivable (a)	$	19,790	$	19,735	$	—	$	—	$	19,735
Derivatives - Interest rate contracts (b)	5,067		5,067		—		5,067		—
Total assets	$	24,857	$	24,802	$	—	$	5,067	$	19,735
Derivatives - Interest rate contracts (b)	$	9	$	9	$	—	$	9	$	—
Secured debt instruments - fixed rate: (c)
Mortgage notes payable	401,135		395,504		—		—		395,504
Fannie Mae credit facilities	355,836		365,391		—		—		365,391
Secured debt instruments - variable rate: (c)
Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
Fannie Mae credit facilities	182,606		182,606		—		—		182,606
Unsecured debt instruments: (c)
Working capital credit facility	36,140		36,140		—		—		36,140
Commercial paper program	220,000		220,000		—		—		220,000
Unsecured notes	2,262,059		2,302,863		—		—		2,302,863
Total liabilities	$	3,552,485	$	3,597,213	$	—	$	9	$	3,597,204
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (d)	$	904,778	$	904,778	$	—	$	904,778	$	—

					Fair Value at December 31, 2016, Using
	Total Carrying Amount in Statement of Financial Position at December 31, 2016		Fair Value Estimate at December 31, 2016		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Description:
Notes receivable (a)	$	19,790	$	19,645	$	—	$	—	$	19,645
Derivatives - Interest rate contracts (b)	4,360		4,360		—		4,360		—
Total assets	$	24,150	$	24,005	$	—	$	4,360	$	19,645
Derivatives- Interest rate contracts (b)	$	413	$	413	$	—	$	413	$	—
Secured debt instruments - fixed rate: (c)
Mortgage notes payable	402,996		396,045		—		—		396,045
Fannie Mae credit facilities	355,836		365,693		—		—		365,693
Secured debt instruments - variable rate: (c)
Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
Fannie Mae credit facilities	280,946		280,946		—		—		280,946
Unsecured debt instruments: (c)
Working capital credit facility	21,350		21,350		—		—		21,350
Unsecured notes	2,261,838		2,304,492		—		—		2,304,492
Total liabilities	$	3,418,079	$	3,463,639	$	—	$	413	$	3,463,226
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (d)	$	909,482	$	909,482	$	—	$	909,482	$	—

(a)See Note 2, Significant Accounting Policies.

(b)See Note 10, Derivatives and Hedging Activity.

(c)See Note 6, Secured Debt and Unsecured Debt, Net.

(d)See Note 8, Noncontrolling Interests.

There were no transfers into or out of any of the levels of the fair value hierarchy during the three months endedMarch 31, 2017.

Financial Instruments Carried at Fair Value

The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. The fair values of interest rate options are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates rise above the strike rate of the caps. The variable interest rates used in the calculation of projected receipts on the cap are based on an expectation of future interest rates derived from observable market interest rate curves and volatilities.

The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees.

Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of March 31, 2017 and December 31, 2016, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. In conjunction with the FASB’s fair value measurement guidance, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.

Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership have a redemption feature and are marked to their redemption value. The redemption value is based on the fair value of the Company’s common stock at the redemption date, and therefore, is calculated based on the fair value of the Company’s common stock at the balance sheet date. Since the valuation is based on observable inputs such as quoted prices for similar instruments in active markets, redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership are classified as Level 2.

Financial Instruments Not Carried at Fair Value

At March 31, 2017 and December 31, 2016, the fair values of cash and cash equivalents, restricted cash, accounts receivable, prepaids, real estate taxes payable, accrued interest payable, security deposits and prepaid rent, distributions payable and accounts payable approximated their carrying values because of the short term nature of these instruments. The estimated fair values of other financial instruments were determined by the Company using available market information and appropriate valuation methodologies. Considerable judgment is necessary to interpret market data and develop estimated fair values. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Company would realize on the disposition of the financial instruments. The use of different market assumptions or estimation methodologies may have a material effect on the estimated fair value amounts.

We estimate the fair value of our notes receivable and debt instruments by discounting the remaining cash flows of the debt instrument at a discount rate equal to the replacement market credit spread plus the corresponding treasury yields. Factors considered in determining a replacement market credit spread include general market conditions, borrower specific credit spreads, time remaining to maturity, loan-to-value ratios and collateral quality, where applicable (Level 3).

We record impairment losses on long-lived assets used in operations when events and circumstances indicate that the assets might be impaired and the undiscounted cash flows estimated to be generated by the future operation and disposition of those assets are less than the net book value of those assets. Our cash flow estimates are based upon historical results adjusted to reflect our best estimate of future market and operating conditions and our estimated holding periods. The net book value of impaired assets is reduced to fair value. Our estimates of fair value represent our best estimate based upon Level 3 inputs such as industry trends and reference to market rates and transactions.

We consider various factors to determine if a decrease in the value of our investment in and advances to unconsolidated joint ventures, net is other-than-temporary. These factors include, but are not limited to, age of the venture, our intent and ability to retain our investment in the entity, the financial condition and long-term prospects of the entity, and the relationships with the other joint venture partners and its lenders. Based on the significance of the unobservable inputs, we classify these fair value measurements within Level 3 of the valuation hierarchy. The Company did not incur any other-than-temporary decrease in the value of its investments in unconsolidated joint ventures during the three months endedMarch 31, 2017 and 2016.

After determining an other-than-temporary decrease in the value of an equity method investment has occurred, we estimate the fair value of our investment by estimating the proceeds we would receive upon a hypothetical liquidation of the investment at the date of measurement. Inputs reflect management’s best estimate of what market participants would use in pricing the investment giving consideration to the terms of the joint venture agreement and the estimated discounted future cash flows to be generated from the underlying joint venture assets. The inputs and assumptions utilized to estimate the future cash flows of the underlying assets are based upon the Company’s evaluation of the economy, market trends, operating results, and other factors, including judgments regarding costs to complete any construction activities, lease up and occupancy rates, rental rates, inflation rates, capitalization rates utilized to estimate the projected cash flows at the disposition, and discount rates.

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Fair Value of Derivatives and Financial Instruments (UNITED DOMINION REALTY, L.P.)

3 Months Ended

Mar. 31, 2017

Entity Information [Line Items]

FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS

FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS

Fair value is based on the price that would be received to sell an asset or the exit price that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three-level valuation hierarchy prioritizes observable and unobservable inputs used to measure fair value. The fair value hierarchy consists of three broad levels, which are described below:

• Level 1 — Quoted prices in active markets for identical assets or liabilities that the entity has the ability to access.

• Level 2 — Observable inputs other than prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated with observable market data.

• Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.

The estimated fair values of the Company’s financial instruments either recorded or disclosed on a recurring basis as of March 31, 2017 and December 31, 2016 are summarized as follows (dollars in thousands):

					Fair Value at March 31, 2017, Using
	Total Carrying Amount in Statement of Financial Position at March 31, 2017		Fair Value Estimate at March 31, 2017		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Description:
Notes receivable (a)	$	19,790	$	19,735	$	—	$	—	$	19,735
Derivatives - Interest rate contracts (b)	5,067		5,067		—		5,067		—
Total assets	$	24,857	$	24,802	$	—	$	5,067	$	19,735
Derivatives - Interest rate contracts (b)	$	9	$	9	$	—	$	9	$	—
Secured debt instruments - fixed rate: (c)
Mortgage notes payable	401,135		395,504		—		—		395,504
Fannie Mae credit facilities	355,836		365,391		—		—		365,391
Secured debt instruments - variable rate: (c)
Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
Fannie Mae credit facilities	182,606		182,606		—		—		182,606
Unsecured debt instruments: (c)
Working capital credit facility	36,140		36,140		—		—		36,140
Commercial paper program	220,000		220,000		—		—		220,000
Unsecured notes	2,262,059		2,302,863		—		—		2,302,863
Total liabilities	$	3,552,485	$	3,597,213	$	—	$	9	$	3,597,204
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (d)	$	904,778	$	904,778	$	—	$	904,778	$	—

					Fair Value at December 31, 2016, Using
	Total Carrying Amount in Statement of Financial Position at December 31, 2016		Fair Value Estimate at December 31, 2016		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Description:
Notes receivable (a)	$	19,790	$	19,645	$	—	$	—	$	19,645
Derivatives - Interest rate contracts (b)	4,360		4,360		—		4,360		—
Total assets	$	24,150	$	24,005	$	—	$	4,360	$	19,645
Derivatives- Interest rate contracts (b)	$	413	$	413	$	—	$	413	$	—
Secured debt instruments - fixed rate: (c)
Mortgage notes payable	402,996		396,045		—		—		396,045
Fannie Mae credit facilities	355,836		365,693		—		—		365,693
Secured debt instruments - variable rate: (c)
Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
Fannie Mae credit facilities	280,946		280,946		—		—		280,946
Unsecured debt instruments: (c)
Working capital credit facility	21,350		21,350		—		—		21,350
Unsecured notes	2,261,838		2,304,492		—		—		2,304,492
Total liabilities	$	3,418,079	$	3,463,639	$	—	$	413	$	3,463,226
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (d)	$	909,482	$	909,482	$	—	$	909,482	$	—

(a)See Note 2, Significant Accounting Policies.

(b)See Note 10, Derivatives and Hedging Activity.

(c)See Note 6, Secured Debt and Unsecured Debt, Net.

(d)See Note 8, Noncontrolling Interests.

There were no transfers into or out of any of the levels of the fair value hierarchy during the three months endedMarch 31, 2017.

Financial Instruments Carried at Fair Value

The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. The fair values of interest rate options are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates rise above the strike rate of the caps. The variable interest rates used in the calculation of projected receipts on the cap are based on an expectation of future interest rates derived from observable market interest rate curves and volatilities.

The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees.

Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of March 31, 2017 and December 31, 2016, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. In conjunction with the FASB’s fair value measurement guidance, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.

Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership have a redemption feature and are marked to their redemption value. The redemption value is based on the fair value of the Company’s common stock at the redemption date, and therefore, is calculated based on the fair value of the Company’s common stock at the balance sheet date. Since the valuation is based on observable inputs such as quoted prices for similar instruments in active markets, redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership are classified as Level 2.

Financial Instruments Not Carried at Fair Value

At March 31, 2017 and December 31, 2016, the fair values of cash and cash equivalents, restricted cash, accounts receivable, prepaids, real estate taxes payable, accrued interest payable, security deposits and prepaid rent, distributions payable and accounts payable approximated their carrying values because of the short term nature of these instruments. The estimated fair values of other financial instruments were determined by the Company using available market information and appropriate valuation methodologies. Considerable judgment is necessary to interpret market data and develop estimated fair values. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Company would realize on the disposition of the financial instruments. The use of different market assumptions or estimation methodologies may have a material effect on the estimated fair value amounts.

We estimate the fair value of our notes receivable and debt instruments by discounting the remaining cash flows of the debt instrument at a discount rate equal to the replacement market credit spread plus the corresponding treasury yields. Factors considered in determining a replacement market credit spread include general market conditions, borrower specific credit spreads, time remaining to maturity, loan-to-value ratios and collateral quality, where applicable (Level 3).

We record impairment losses on long-lived assets used in operations when events and circumstances indicate that the assets might be impaired and the undiscounted cash flows estimated to be generated by the future operation and disposition of those assets are less than the net book value of those assets. Our cash flow estimates are based upon historical results adjusted to reflect our best estimate of future market and operating conditions and our estimated holding periods. The net book value of impaired assets is reduced to fair value. Our estimates of fair value represent our best estimate based upon Level 3 inputs such as industry trends and reference to market rates and transactions.

We consider various factors to determine if a decrease in the value of our investment in and advances to unconsolidated joint ventures, net is other-than-temporary. These factors include, but are not limited to, age of the venture, our intent and ability to retain our investment in the entity, the financial condition and long-term prospects of the entity, and the relationships with the other joint venture partners and its lenders. Based on the significance of the unobservable inputs, we classify these fair value measurements within Level 3 of the valuation hierarchy. The Company did not incur any other-than-temporary decrease in the value of its investments in unconsolidated joint ventures during the three months endedMarch 31, 2017 and 2016.

After determining an other-than-temporary decrease in the value of an equity method investment has occurred, we estimate the fair value of our investment by estimating the proceeds we would receive upon a hypothetical liquidation of the investment at the date of measurement. Inputs reflect management’s best estimate of what market participants would use in pricing the investment giving consideration to the terms of the joint venture agreement and the estimated discounted future cash flows to be generated from the underlying joint venture assets. The inputs and assumptions utilized to estimate the future cash flows of the underlying assets are based upon the Company’s evaluation of the economy, market trends, operating results, and other factors, including judgments regarding costs to complete any construction activities, lease up and occupancy rates, rental rates, inflation rates, capitalization rates utilized to estimate the projected cash flows at the disposition, and discount rates.

United Dominion Reality L.P. [Member]

Entity Information [Line Items]

FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS

FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS

Fair value is based on the price that would be received to sell an asset or the exit price that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three-level valuation hierarchy prioritizes observable and unobservable inputs used to measure fair value. The fair value hierarchy consists of three broad levels, which are described below:

• Level 1 — Quoted prices in active markets for identical assets or liabilities that the entity has the ability to access.

• Level 2 — Observable inputs other than prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated with observable market data.

• Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.

The estimated fair values of the Operating Partnership’s financial instruments either recorded or disclosed on a recurring basis as of March 31, 2017 and December 31, 2016 are summarized as follows (dollars in thousands):

					Fair Value at March 31, 2017, Using
	Total Carrying Amount in Statement of Financial Position at March 31, 2017		Fair Value Estimate at March 31, 2017		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Description:
Secured debt instruments - fixed rate: (a)
Fannie Mae credit facilities	$	228,870	$	235,159	$	—	$	—	$	235,159
Secured debt instruments - variable rate: (a)
Tax-exempt secured notes payable	27,000		27,000		—		—		27,000
Fannie Mae credit facilities	81,339		81,339		—		—		81,339
Total liabilities	$	337,209	$	343,498	$	—	$	—	$	343,498

					Fair Value at December 31, 2016, Using
	Total Carrying Amount in Statement of Financial Position at December 31, 2016		Fair Value Estimate at December 31, 2016		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Description:
Derivatives - Interest rate contracts (b)	$	1	$	1	$	—	$	1	$	—
Total assets	$	1	$	1	$	—	$	1	$	—
Secured debt instruments - fixed rate: (a)
Fannie Mae credit facilities	$	244,912	$	251,664	$	—	$	—	$	251,664
Secured debt instruments - variable rate: (a)
Tax-exempt secured notes payable	27,000		27,000		—		—		27,000
Fannie Mae credit facilities	163,637		163,637		—		—		163,637
Total liabilities	$	435,549	$	442,301	$	—	$	—	$	442,301

(a)See Note 5, Debt, Net.

(b)See Note 8, Derivatives and Hedging Activity.

There were no transfers into or out of any of the levels of the fair value hierarchy during the three months endedMarch 31, 2017.

Financial Instruments Carried at Fair Value

The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. The fair values of interest rate options are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates rise above the strike rate of the caps. The variable interest rates used in the calculation of projected receipts on the cap are based on an expectation of future interest rates derived from observable market interest rate curves and volatilities.

The General Partner, on behalf of the Operating Partnership, incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Operating Partnership has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees.

Although the General Partner, on behalf of the Operating Partnership, has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of March 31, 2017 and December 31, 2016, the Operating Partnership has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Operating Partnership has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. In conjunction with the FASB’s fair value measurement guidance, the Operating Partnership made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.

Financial Instruments Not Carried at Fair Value

As of March 31, 2017, the fair values of cash and cash equivalents, restricted cash, accounts receivable, prepaids, real estate taxes payable, accrued interest payable, security deposits and prepaid rent, distributions payable and accounts payable approximated their carrying values because of the short term nature of these instruments. The estimated fair values of other financial instruments were determined by the Operating Partnership using available market information and appropriate valuation methodologies. Considerable judgment is necessary to interpret market data and develop estimated fair values. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Operating Partnership would realize on the disposition of the financial instruments. The use of different market assumptions or estimation methodologies may have a material effect on the estimated fair value amounts.

The General Partner estimates the fair value of our debt instruments by discounting the remaining cash flows of the debt instrument at a discount rate equal to the replacement market credit spread plus the corresponding treasury yields. Factors considered in determining a replacement market credit spread include general market conditions, borrower specific credit spreads, time remaining to maturity, loan-to-value ratios and collateral quality (Level 3).

The Operating Partnership records impairment losses on long-lived assets used in operations when events and circumstances indicate that the assets might be impaired and the undiscounted cash flows estimated to be generated by the future operation and disposition of those assets are less than the net book value of those assets. Cash flow estimates are based upon historical results adjusted to reflect management’s best estimate of future market and operating conditions and our estimated holding periods. The net book value of impaired assets is reduced to fair value. The General Partner’s estimates of fair value represent management’s estimates based upon Level 3 inputs such as industry trends and reference to market rates and transactions.

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Derivatives and Hedging Activity

3 Months Ended

Mar. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Activities Disclosure [Text Block]

DERIVATIVES AND HEDGING ACTIVITY

Risk Management Objective of Using Derivatives

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

Cash Flow Hedges of Interest Rate Risk

The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps and caps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. Interest rate caps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty if interest rates rise above the strike rate on the contract in exchange for an up-front premium.

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in Accumulated other comprehensive income/(loss), net in the Consolidated Balance Sheets and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During the three months endedMarch 31, 2017 and 2016, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. During the three months endedMarch 31, 2017, the Company recognized a loss of less than $0.1 million reclassified from Accumulated OCI to Interest expense due to the de-designation of a cash flow hedge and recorded no other ineffectiveness to earnings. During the three months endedMarch 31, 2016, the Company recorded no ineffectiveness to earnings.

Amounts reported in Accumulated other comprehensive income/(loss), net in the Consolidated Balance Sheets related to derivatives that will be reclassified to interest expense as interest payments are made on the Company’s variable-rate debt. Through March 31,2018, the Company estimates that an additional $0.5 million will be reclassified as an increase to interest expense.

As of March 31, 2017, the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate swaps (a)	4	$	315,000
Interest rate caps	2	$	203,166

(a) Of the four interest rate swaps noted in the table above, two swaps with an aggregate notional value of $215.0 million mature in April 2017 and two swaps with an aggregate notional value of $100.0 million mature in January 2020. The Company has entered into two forward starting interest rate swaps with an aggregate notional value of $215.0 million and a maturity in January 2020, which are effective upon the expiration of the swaps maturing in April 2017.

Derivatives not designated as hedges are not speculative and are used to manage the Company’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in a loss of less than $0.1 million for the three months endedMarch 31, 2017 and 2016.

As of March 31, 2017, the Company had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate caps	3	$	133,107

Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheet

The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	Asset Derivatives (included in Other assets)				Liability Derivatives (included in Other liabilities)
	Fair Value at:				Fair Value at:
	March 31, 2017		December 31, 2016		March 31, 2017		December 31, 2016
Derivatives designated as hedging instruments:
Interest rate products	$	5,067	$	4,359	$	9	$	413
Derivatives not designated as hedging instruments:
Interest rate products	$	—	$	1	$	—	$	—

Tabular Disclosure of the Effect of Derivative Instruments on the Consolidated Statements of Operations

The tables below present the effect of the Company’s derivative financial instruments on the Consolidated Statements of Operations for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

Derivatives in Cash Flow Hedging Relationships	Unrealized holding gain/(loss) Recognized in OCI (Effective Portion)					Gain/(Loss) Reclassified from Accumulated OCI into Interest expense (Effective Portion)						Gain/(Loss) Recognized in Interest expense (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	2017		2016			2017			2016			2017			2016
Three Months Ended March 31,
Interest rate products	$	632	$	(811	)	$	(764	)	$	(935	)	$	(54	)	$	—

	Gain/(Loss) Recognized in Interest income and other income/(expense), net
Derivatives Not Designated as Hedging Instruments	2017			2016
Three Months Ended March 31,
Interest rate products	$	(1	)	$	—

Credit-risk-related Contingent Features

The Company has agreements with some of its derivative counterparties that contain a provision where (1) if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations; or (2) the Company could be declared in default on its derivative obligations if repayment of the underlying indebtedness is accelerated by the lender due to the Company’s default on the indebtedness.

Certain of the Company’s agreements with its derivative counterparties contain provisions where, if there is a change in the Company’s financial condition that materially changes the Company’s creditworthiness in an adverse manner, the Company may be required to fully collateralize its obligations under the derivative instrument. At March 31, 2017 and December 31, 2016, no cash collateral was posted or required to be posted by the Company or by a counterparty.

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

The Company has certain agreements with some of its derivative counterparties that contain a provision where, in the event of default by the Company or the counterparty, the right of setoff may be exercised. Any amount payable to one party by the other party may be reduced by its setoff against any amounts payable by the other party. Events that give rise to default by either party may include, but are not limited to, the failure to pay or deliver payment under the derivative agreement, the failure to comply with or perform under the derivative agreement, bankruptcy, a merger without assumption of the derivative agreement, or in a merger, a surviving entity's creditworthiness is materially weaker than the original party to the derivative agreement.

As of March 31, 2017, the fair value of derivatives was in a net asset position, which includes accrued interest but excludes any adjustment for nonperformance risk related to these agreements, of $4.9 million. As of March 31, 2017, the Company has not posted any collateral related to these agreements.

Tabular Disclosure of Offsetting Derivatives

The Company has elected not to offset derivative positions in the consolidated financial statements. The tables below present the effect on its financial position had the Company made the election to offset its derivative positions as of March 31, 2017 and December 31, 2016(dollars in thousands):

Offsetting of Derivative Assets
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Financial Instruments			Cash Collateral Received		Net Amount
March 31, 2017	$	5,067	$	—	$	5,067	$	(5	)	$	—	$	5,062
December 31, 2016	$	4,360	$	—	$	4,360	$	(221	)	$	—	$	4,139

(a) Amounts reconcile to the aggregate fair value of derivative assets in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

Offsetting of Derivative Liabilities
	Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (a)		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Financial Instruments			Cash Collateral Posted		Net Amount
March 31, 2017	$	9	$	—	$	9	$	(5	)	$	—	$	4
December 31, 2016	$	413	$	—	$	413	$	(221	)	$	—	$	192

(a) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

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Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.)

3 Months Ended

Mar. 31, 2017

Entity Information [Line Items]

DERIVATIVES AND HEDGING ACTIVITY

DERIVATIVES AND HEDGING ACTIVITY

Risk Management Objective of Using Derivatives

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

Cash Flow Hedges of Interest Rate Risk

The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps and caps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. Interest rate caps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty if interest rates rise above the strike rate on the contract in exchange for an up-front premium.

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in Accumulated other comprehensive income/(loss), net in the Consolidated Balance Sheets and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During the three months endedMarch 31, 2017 and 2016, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. During the three months endedMarch 31, 2017, the Company recognized a loss of less than $0.1 million reclassified from Accumulated OCI to Interest expense due to the de-designation of a cash flow hedge and recorded no other ineffectiveness to earnings. During the three months endedMarch 31, 2016, the Company recorded no ineffectiveness to earnings.

Amounts reported in Accumulated other comprehensive income/(loss), net in the Consolidated Balance Sheets related to derivatives that will be reclassified to interest expense as interest payments are made on the Company’s variable-rate debt. Through March 31,2018, the Company estimates that an additional $0.5 million will be reclassified as an increase to interest expense.

As of March 31, 2017, the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate swaps (a)	4	$	315,000
Interest rate caps	2	$	203,166

(a) Of the four interest rate swaps noted in the table above, two swaps with an aggregate notional value of $215.0 million mature in April 2017 and two swaps with an aggregate notional value of $100.0 million mature in January 2020. The Company has entered into two forward starting interest rate swaps with an aggregate notional value of $215.0 million and a maturity in January 2020, which are effective upon the expiration of the swaps maturing in April 2017.

Derivatives not designated as hedges are not speculative and are used to manage the Company’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in a loss of less than $0.1 million for the three months endedMarch 31, 2017 and 2016.

As of March 31, 2017, the Company had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate caps	3	$	133,107

Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheet

The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	Asset Derivatives (included in Other assets)				Liability Derivatives (included in Other liabilities)
	Fair Value at:				Fair Value at:
	March 31, 2017		December 31, 2016		March 31, 2017		December 31, 2016
Derivatives designated as hedging instruments:
Interest rate products	$	5,067	$	4,359	$	9	$	413
Derivatives not designated as hedging instruments:
Interest rate products	$	—	$	1	$	—	$	—

Tabular Disclosure of the Effect of Derivative Instruments on the Consolidated Statements of Operations

The tables below present the effect of the Company’s derivative financial instruments on the Consolidated Statements of Operations for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

Derivatives in Cash Flow Hedging Relationships	Unrealized holding gain/(loss) Recognized in OCI (Effective Portion)					Gain/(Loss) Reclassified from Accumulated OCI into Interest expense (Effective Portion)						Gain/(Loss) Recognized in Interest expense (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	2017		2016			2017			2016			2017			2016
Three Months Ended March 31,
Interest rate products	$	632	$	(811	)	$	(764	)	$	(935	)	$	(54	)	$	—

	Gain/(Loss) Recognized in Interest income and other income/(expense), net
Derivatives Not Designated as Hedging Instruments	2017			2016
Three Months Ended March 31,
Interest rate products	$	(1	)	$	—

Credit-risk-related Contingent Features

The Company has agreements with some of its derivative counterparties that contain a provision where (1) if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations; or (2) the Company could be declared in default on its derivative obligations if repayment of the underlying indebtedness is accelerated by the lender due to the Company’s default on the indebtedness.

Certain of the Company’s agreements with its derivative counterparties contain provisions where, if there is a change in the Company’s financial condition that materially changes the Company’s creditworthiness in an adverse manner, the Company may be required to fully collateralize its obligations under the derivative instrument. At March 31, 2017 and December 31, 2016, no cash collateral was posted or required to be posted by the Company or by a counterparty.

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

The Company has certain agreements with some of its derivative counterparties that contain a provision where, in the event of default by the Company or the counterparty, the right of setoff may be exercised. Any amount payable to one party by the other party may be reduced by its setoff against any amounts payable by the other party. Events that give rise to default by either party may include, but are not limited to, the failure to pay or deliver payment under the derivative agreement, the failure to comply with or perform under the derivative agreement, bankruptcy, a merger without assumption of the derivative agreement, or in a merger, a surviving entity's creditworthiness is materially weaker than the original party to the derivative agreement.

As of March 31, 2017, the fair value of derivatives was in a net asset position, which includes accrued interest but excludes any adjustment for nonperformance risk related to these agreements, of $4.9 million. As of March 31, 2017, the Company has not posted any collateral related to these agreements.

Tabular Disclosure of Offsetting Derivatives

The Company has elected not to offset derivative positions in the consolidated financial statements. The tables below present the effect on its financial position had the Company made the election to offset its derivative positions as of March 31, 2017 and December 31, 2016(dollars in thousands):

Offsetting of Derivative Assets
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Financial Instruments			Cash Collateral Received		Net Amount
March 31, 2017	$	5,067	$	—	$	5,067	$	(5	)	$	—	$	5,062
December 31, 2016	$	4,360	$	—	$	4,360	$	(221	)	$	—	$	4,139

(a) Amounts reconcile to the aggregate fair value of derivative assets in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

Offsetting of Derivative Liabilities
	Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (a)		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Financial Instruments			Cash Collateral Posted		Net Amount
March 31, 2017	$	9	$	—	$	9	$	(5	)	$	—	$	4
December 31, 2016	$	413	$	—	$	413	$	(221	)	$	—	$	192

(a) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

United Dominion Reality L.P. [Member]

Entity Information [Line Items]

DERIVATIVES AND HEDGING ACTIVITY

DERIVATIVES AND HEDGING ACTIVITY

Risk Management Objective of Using Derivatives

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

Cash Flow Hedges of Interest Rate Risk

The General Partner’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the General Partner primarily uses interest rate swaps and caps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the General Partner making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. Interest rate caps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty if interest rates rise above the strike rate on the contract in exchange for an up front premium.

A portion of the General Partner’s interest rate derivatives are owed by the Operating Partnership based on the General Partner’s underlying debt instruments owed by the Operating Partnership. (See Note 5, Debt, Net.)

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in Accumulated other comprehensive income/(loss), net in the Consolidated Balance Sheets and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During the three months endedMarch 31, 2017 and 2016, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. During the three months endedMarch 31, 2017, the Operating Partnership recognized a loss of less than $0.1 million reclassified from Accumulated other comprehensive income/(loss), net to Interest expense due to the de-designation of a cash flow hedge and recorded no other ineffectiveness to earnings. During the three months endedMarch 31, 2016, the Operating Partnership recorded no gain or loss from ineffectiveness.

Amounts reported in Accumulated other comprehensive income/(loss), net related to derivatives will be reclassified to interest expense as interest payments are made on the General Partner’s variable-rate debt that is owed by the Operating Partnership. Through March 31,2018, we estimate that less than $0.1 million will be reclassified as an increase to interest expense.

As of March 31, 2017, the Operating Partnership had the following outstanding interest rate derivatives designated as cash flow hedges of interest rate risk (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate caps	1	$	82,494

Derivatives not designated as hedges are not speculative and are used to manage the Operating Partnership’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in an adjustment to earnings of less than $0.1 million for the three months endedMarch 31, 2017 and 2016.

As of March 31, 2017, we had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate caps	3	$	87,580

Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets

The table below presents the fair value of the Operating Partnership’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	Asset Derivatives (included in Other assets)				Liability Derivatives (included in Other liabilities)
	Fair Value at:				Fair Value at:
	March 31, 2017		December 31, 2016		March 31, 2017		December 31, 2016
Derivatives designated as hedging instruments:
Interest rate products	$	—	$	—	$	—	$	—
Derivatives not designated as hedging instruments:
Interest rate products	$	—	$	1	$	—	$	—

Tabular Disclosure of the Effect of Derivative Instruments on the Consolidated Statements of Operations

The tables below present the effect of the derivative financial instruments on the Consolidated Statements of Operations for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

	Unrealized holding gain/(loss) Recognized in OCI (Effective Portion)					Gain/(Loss) Reclassified from Accumulated OCI into Interest expense (Effective Portion)					Gain/(Loss) Recognized in Interest expense (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Derivatives in Cash Flow Hedging Relationships	2017		2016			2017		2016			2017			2016
Three Months Ended March 31,
Interest rate products	$	—	$	(2	)	$	—	$	(1	)	$	(54	)	$	—

	Gain/(Loss) Recognized in Interest income and other income/(expense), net
Derivatives Not Designated as Hedging Instruments	2017			2016
Three Months Ended March 31,
Interest rate products	$	(1	)	$	—

Credit-risk-related Contingent Features

The General Partner has agreements with some of its derivative counterparties that contain a provision where (1) if the General Partner defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the General Partner could also be declared in default on its derivative obligations; or (2) the General Partner could be declared in default on its derivative obligations if repayment of the underlying indebtedness is accelerated by the lender due to the General Partner’s default on the indebtedness.

Certain of the General Partner’s agreements with its derivative counterparties contain provisions where if there is a change in the General Partner’s financial condition that materially changes the General Partner’s creditworthiness in an adverse manner, the General Partner may be required to fully collateralize its obligations under the derivative instrument. At March 31, 2017 and December 31, 2016, no cash collateral was posted or required to be posted by the General Partner or by a counterparty.

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

The General Partner has certain agreements with some of its derivative counterparties that contain a provision where in the event of default by the General Partner or the counterparty, the right of setoff may be exercised. Any amount payable to one party by the other party may be reduced by its setoff against any amounts payable by the other party. Events that give rise to default by either party may include, but are not limited to, the failure to pay or deliver payment under the derivative agreement, the failure to comply with or perform under the derivative agreement, bankruptcy, a merger without assumption of the derivative agreement, or in a merger, a surviving entity’s creditworthiness is materially weaker than the original party to the derivative agreement.

As of March 31, 2017, the fair value of derivatives in a net liability position that were owed by the Operating Partnership, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was zero.

The General Partner has elected not to offset derivative positions in the consolidated financial statements. The table below presents the effect on the Operating Partnership’s financial position had the General Partner made the election to offset its derivative positions as of March 31, 2017 and December 31, 2016:

Offsetting of Derivative Assets
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Financial Instruments		Cash Collateral Received		Net Amount
March 31, 2017	$	—	$	—	$	—	$	—	$	—	$	—
December 31, 2016	$	1	$	—	$	1	$	—	$	—	$	1

(a) Amounts reconcile to the aggregate fair value of derivative assets in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

Offsetting of Derivative Liabilities

Gross Amounts of Recognized Liabilities

Gross Amounts Offset in the Consolidated Balance Sheets

Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (a)

Gross Amounts Not Offset in the Consolidated Balance Sheets

Financial Instruments

Cash Collateral Posted

Net Amount

March 31, 2017

$

—

$

—

$

—

$

—

$

—

$

—

December 31, 2016

$

—

$

—

$

—

$

—

$

—

$

—

(a) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

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Stock Based Compensation

3 Months Ended

Mar. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK BASED COMPENSATION

STOCK BASED COMPENSATION

The Company recognized stock based compensation expense, inclusive of awards granted to our independent directors, net of capitalization, of $3.4 million and $3.9 million during the three months endedMarch 31, 2017 and 2016, respectively.

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Capital Structure (UNITED DOMINION REALTY, L.P.)

3 Months Ended

Mar. 31, 2017

United Dominion Reality L.P. [Member]

Entity Information [Line Items]

CAPITAL STRUCTURE

CAPITAL STRUCTURE

General Partnership Units

The General Partner has complete discretion to manage and control the operations and business of the Operating Partnership, which includes but is not limited to the acquisition and disposition of real property, construction of buildings and making capital improvements, and the borrowing of funds from outside lenders or UDR and its subsidiaries to finance such activities. The General Partner can generally authorize, issue, sell, redeem or purchase any OP Unit or securities of the Operating Partnership without the approval of the limited partners. The General Partner can also approve, with regard to the issuances of OP Units, the class or one or more series of classes, with designations, preferences, participating, optional or other special rights, powers and duties including rights, powers and duties senior to limited partnership interests without approval of any limited partners except holders of Class A Limited Partnership Units. There were 110,883 General Partnership units outstanding at March 31, 2017 and December 31, 2016, all of which were held by UDR.

Limited Partnership Units

As of March 31, 2017 and December 31, 2016, there were 183,240,041 and 183,167,815, respectively, of limited partnership units outstanding, of which 1,873,332 were Class A Limited Partnership Units. UDR owned 174,122,808, or 95.0%, and 174,119,201, or 95.1%, of OP Units outstanding at March 31, 2017 and December 31, 2016, respectively, of which 121,661 were Class A Limited Partnership Units. The remaining 9,117,233, or 5.0%, and 9,048,614, or 4.9%, of OP Units outstanding were held by non-affiliated partners at March 31, 2017 and December 31, 2016, respectively, of which 1,751,671 were Class A Limited Partnership Units.

Subject to the terms of the Operating Partnership Agreement, the limited partners have the right to require the Operating Partnership to redeem all or a portion of the OP Units held by the limited partner at a redemption price equal to and in the form of the Cash Amount (as defined in the Operating Partnership Agreement), provided that such OP Units have been outstanding for at least one year. UDR, as general partner of the Operating Partnership, may, in its sole discretion, purchase the OP Units by paying to the limited partner either the Cash Amount or the REIT Share Amount (generally one share of common stock of UDR for each OP Unit), as defined in the Operating Partnership Agreement.

The non-affiliated limited partners’ capital is adjusted to redemption value at the end of each reporting period with the corresponding offset against UDR’s limited partner capital account based on the redemption rights noted above. The aggregate value upon redemption of the then-outstanding OP Units held by limited partners was $330.6 million and $330.1 million as of March 31, 2017 and December 31, 2016, respectively, based on the value of UDR’s common stock at each period end. A limited partner has no right to receive any distributions from the Operating Partnership on or after the date of redemption of its OP Units.

Class A Limited Partnership Units

Class A Limited Partnership Units have a cumulative, annual, non-compounded preferred return, which is equal to 8% based on a value of $16.61 per Class A Limited Partnership Unit.

Holders of the Class A Limited Partnership Units exclusively possess certain voting rights. The Operating Partnership may not do the following without approval of the holders of the Class A Limited Partnership Units: (i) increase the authorized or issued amount of Class A Limited Partnership Units, (ii) reclassify any other partnership interest into Class A Limited Partnership Units, (iii) create, authorize or issue any obligations or security convertible into or the right to purchase Class A Limited Partnership Units, (iv) enter into a merger or acquisition, or (v) amend or modify the Operating Partnership Agreement in a manner that adversely affects the relative rights, preferences or privileges of the Class A Limited Partnership Units.

The following table shows OP Units outstanding and OP Unit activity as of and for the three months ended March 31, 2017:

	Class A Limited Partners			UDR, Inc.
		Limited Partners		Limited Partner	Class A Limited Partner	General Partner	Total
Ending balance at December 31, 2016	1,751,671	7,296,943		173,997,540	121,661	110,883	183,278,698
Vesting of LTIP Units	—	72,226		—		—	72,226
OP redemptions for UDR stock	—	(3,607	)	3,607	—	—	—
Ending balance at March 31, 2017	1,751,671	7,365,562		174,001,147	121,661	110,883	183,350,924

LTIP Units

UDR grants long-term incentive plan units ("LTIP Units") to certain employees and non-employee directors. The LTIP Units represent an ownership interest in the Operating Partnership and have voting and distribution rights consistent with OP Units. The LTIP Units are subject to the terms of UDR's long-term incentive plan.

Two classes of LTIP Units are granted, Class 1 LTIP Units and Class 2 LTIP Units. Class 1 LTIP Units are granted to non-employee directors and vest after one year. Class 2 LTIP Units are granted to certain employees and vest over a period from one to three years subject to certain performance and market conditions being achieved. Vested LTIP Units may be converted into OP Units provided that such LTIP Units have been outstanding for at least two years from the date of grant.

Allocation of Profits and Losses

Profit of the Operating Partnership is allocated in the following order: (i) to the General Partner and the Limited Partners in proportion to and up to the amount of cash distributions made during the year, and (ii) to the General Partner and Limited Partners in accordance with their percentage interests. Losses and depreciation and amortization expenses, non-recourse liabilities are allocated to the General Partner and Limited Partners in accordance with their percentage interests. Losses allocated to the Limited Partners are capped to the extent that such an allocation would not cause a deficit in the Limited Partners’ capital account. Such losses are, therefore, allocated to the General Partner. If any Partner’s capital balance were to fall into a deficit, any income and gains are allocated to each Partner sufficient to eliminate its negative capital balance.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Commitments

Real Estate Under Development

The following summarizes the Company’s real estate commitments at March 31, 2017 (dollars in thousands):

	Number of Properties	Costs Incurred to Date (a)			Expected Costs to Complete			Average Ownership Stake
Wholly-owned — under development	2	$	393,837	(b)	$	314,663		100	%
Wholly-owned — redevelopment	1	3,699		(b)	5,801			100	%
Joint ventures:
Unconsolidated joint ventures	6	721,462			66,525		(c)	50	%
Participating loan investments	1	94,002		(d)	—		(e)	0	%
Preferred equity investments	2	42,013		(f)	—			49	%
Total		$	1,255,013		$	386,989

(a) Represents 100% of project costs incurred as of March 31, 2017.

(b) Costs incurred as of March 31, 2017 include $25.3 million and $0.7 million of accruedfixed assets for development and redevelopment, respectively.

(c) Represents UDR’s proportionate share of expected remaining costs to complete the developments.

(d) Represents the participating loan balance funded as of March 31, 2017.

(e) Represents UDR's remaining participating loan commitment for Steele Creek.

(f) Represents UDR's investment in the West Coast Development Joint Ventures for the properties under development as of March 31, 2017.

Contingencies

Litigation and Legal Matters

The Company is subject to various legal proceedings and claims arising in the ordinary course of business. The Company cannot determine the ultimate liability with respect to such legal proceedings and claims at this time. The Company believes that such liability, to the extent not provided for through insurance or otherwise, will not have a material adverse effect on our financial condition, results of operations or cash flow.

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Commitments and Contingencies (UNITED DOMINION REALTY, L.P.) Commitments and Contingencies (UNITED DOMINION REALTY, L.P.)

3 Months Ended

Mar. 31, 2017

Entity Information [Line Items]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Commitments

Real Estate Under Development

The following summarizes the Company’s real estate commitments at March 31, 2017 (dollars in thousands):

	Number of Properties	Costs Incurred to Date (a)			Expected Costs to Complete			Average Ownership Stake
Wholly-owned — under development	2	$	393,837	(b)	$	314,663		100	%
Wholly-owned — redevelopment	1	3,699		(b)	5,801			100	%
Joint ventures:
Unconsolidated joint ventures	6	721,462			66,525		(c)	50	%
Participating loan investments	1	94,002		(d)	—		(e)	0	%
Preferred equity investments	2	42,013		(f)	—			49	%
Total		$	1,255,013		$	386,989

(a) Represents 100% of project costs incurred as of March 31, 2017.

(b) Costs incurred as of March 31, 2017 include $25.3 million and $0.7 million of accruedfixed assets for development and redevelopment, respectively.

(c) Represents UDR’s proportionate share of expected remaining costs to complete the developments.

(d) Represents the participating loan balance funded as of March 31, 2017.

(e) Represents UDR's remaining participating loan commitment for Steele Creek.

(f) Represents UDR's investment in the West Coast Development Joint Ventures for the properties under development as of March 31, 2017.

Contingencies

Litigation and Legal Matters

The Company is subject to various legal proceedings and claims arising in the ordinary course of business. The Company cannot determine the ultimate liability with respect to such legal proceedings and claims at this time. The Company believes that such liability, to the extent not provided for through insurance or otherwise, will not have a material adverse effect on our financial condition, results of operations or cash flow.

United Dominion Reality L.P. [Member]

Entity Information [Line Items]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Contingencies

Litigation and Legal Matters

The Operating Partnership is subject to various legal proceedings and claims arising in the ordinary course of business. The Operating Partnership cannot determine the ultimate liability with respect to such legal proceedings and claims at this time. The General Partner believes that such liability, to the extent not provided for through insurance or otherwise, will not have a material adverse effect on the Operating Partnership’s financial condition, results of operations or cash flow.

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Reportable Segments

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

REPORTABLE SEGMENTS

REPORTABLE SEGMENTS

GAAP guidance requires that segment disclosures present the measure(s) used by the chief operating decision maker to decide how to allocate resources and for purposes of assessing such segments’ performance. UDR’s chief operating decision maker is comprised of several members of its executive management team who use several generally accepted industry financial measures to assess the performance of the business for our reportable operating segments.

UDR owns and operates multifamily apartment communities that generate rental and other property related income through the leasing of apartment homes to a diverse base of tenants. The primary financial measures for UDR’s apartment communities are rental income and net operating income (“NOI”). Rental income represents gross market rent less adjustments for concessions, vacancy loss and bad debt. NOI is defined as rental income less direct property rental expenses. Rental expenses include real estate taxes, insurance, personnel, utilities, repairs and maintenance, administrative and marketing. Excluded from NOI is property management expense, which is calculated as 2.75% of property revenue to cover the regional supervision and accounting costs related to consolidated property operations, and land rent. UDR’s chief operating decision maker utilizes NOI as the key measure of segment profit or loss.

UDR’s two reportable segments are Same-Store Communities and Non-Mature Communities/Other:

• Same-Store Communities represent those communities acquired, developed, and stabilized prior to January 1, 2016 and held as of March 31, 2017. A comparison of operating results from the prior year is meaningful as these communities were owned and had stabilized occupancy and operating expenses as of the beginning of the prior period, there is no plan to conduct substantial redevelopment activities, and the community is not held for disposition within the current year. A community is considered to have stabilized occupancy once it achieves 90% occupancy for at least three consecutive months.

• Non-Mature Communities/Other represent those communities that do not meet the criteria to be included in Same-Store Communities, including, but not limited to, recently acquired, developed and redeveloped communities, and the non-apartment components of mixed use properties.

Management evaluates the performance of each of our apartment communities on a Same-Store Community and Non-Mature Community/Other basis, as well as individually and geographically. This is consistent with the aggregation criteria under GAAP as each of our apartment communities generally has similar economic characteristics, facilities, services, and tenants. Therefore, the Company’s reportable segments have been aggregated by geography in a manner identical to that which is provided to the chief operating decision maker.

All revenues are from external customers and no single tenant or related group of tenants contributed 10% or more of UDR’s total revenues during the three months endedMarch 31, 2017 and 2016.

The following table details rental income and NOI for UDR’s reportable segments for the three months endedMarch 31, 2017 and 2016, and reconciles NOI to Net Income/(Loss) Attributable to UDR, Inc. in the Consolidated Statements of Operations (dollars in thousands):

	Three Months Ended
	March 31, (a)
	2017			2016
Reportable apartment home segment rental income
Same-Store Communities
West Region	$	82,220		$	78,409
Mid-Atlantic Region	52,109			50,154
Northeast Region	37,921			36,460
Southeast Region	28,657			27,137
Southwest Region	10,679			10,125
Non-Mature Communities/Other	29,685			29,672
Total segment and consolidated rental income	$	241,271		$	231,957
Reportable apartment home segment NOI
Same-Store Communities
West Region	$	61,895		$	59,146
Mid-Atlantic Region	36,315			33,729
Northeast Region	26,901			26,360
Southeast Region	19,661			18,797
Southwest Region	6,678			6,331
Non-Mature Communities/Other	20,033			19,771
Total segment and consolidated NOI	171,483			164,134
Reconciling items:
Joint venture management and other fees	2,570			2,858
Property management	(6,635		)	(6,379		)
Other operating expenses	(1,691		)	(1,752		)
Real estate depreciation and amortization	(105,032		)	(105,339		)
General and administrative	(13,075		)	(13,844		)
Casualty-related (charges)/recoveries, net	(502		)	—
Other depreciation and amortization	(1,608		)	(1,553		)
Income/(loss) from unconsolidated entities	11,198			679
Interest expense	(30,539		)	(31,104		)
Interest income and other income/(expense), net	427			431
Tax (provision)/benefit, net	(332		)	403
Gain/(loss) on sale of real estate owned, net of tax	2,132			3,070
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(2,338		)	(905		)
Net (income)/loss attributable to noncontrolling interests	(91		)	(306		)
Net income/(loss) attributable to UDR, Inc.	$	25,967		$	10,393

(a) Same-Store Community population consisted of 35,689 apartment homes.

The following table details the assets of UDR’s reportable segments as of March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Reportable apartment home segment assets:
Same-Store Communities:
West Region	$	2,944,437		$	2,938,073
Mid-Atlantic Region	2,221,312			2,216,067
Northeast Region	1,858,432			1,857,193
Southeast Region	750,147			746,762
Southwest Region	283,979			283,260
Non-Mature Communities/Other	1,729,262			1,574,398
Total segment assets	9,787,569			9,615,753
Accumulated depreciation	(3,026,660		)	(2,923,625		)
Total segment assets — net book value	6,760,909			6,692,128
Reconciling items:
Cash and cash equivalents	2,460			2,112
Restricted cash	19,757			19,994
Notes receivable, net	19,790			19,790
Investment in and advances to unconsolidated joint ventures, net	818,990			827,025
Other assets	114,005			118,535
Total consolidated assets	$	7,735,911		$	7,679,584

Capital expenditures related to our Same-Store Communities totaled $15.3 million and $12.9 million for the three months endedMarch 31, 2017 and 2016, respectively. Capital expenditures related to our Non-Mature Communities/Other totaled $0.8 million and $2.7 million for the three months endedMarch 31, 2017 and 2016, respectively.

Markets included in the above geographic segments are as follows:

i. West Region — San Francisco, Orange County, Seattle, Los Angeles, Monterey Peninsula, Other Southern California and Portland

ii. Mid-Atlantic Region — Metropolitan D.C., Richmond and Baltimore

iii. Northeast Region — New York and Boston

iv. Southeast Region — Orlando, Tampa, Nashville and Other Florida

v. Southwest Region — Dallas and Austin

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Reportable Segments (UNITED DOMINION REALTY, L.P.)

3 Months Ended

Mar. 31, 2017

Entity Information [Line Items]

REPORTABLE SEGMENTS

REPORTABLE SEGMENTS

GAAP guidance requires that segment disclosures present the measure(s) used by the chief operating decision maker to decide how to allocate resources and for purposes of assessing such segments’ performance. UDR’s chief operating decision maker is comprised of several members of its executive management team who use several generally accepted industry financial measures to assess the performance of the business for our reportable operating segments.

UDR owns and operates multifamily apartment communities that generate rental and other property related income through the leasing of apartment homes to a diverse base of tenants. The primary financial measures for UDR’s apartment communities are rental income and net operating income (“NOI”). Rental income represents gross market rent less adjustments for concessions, vacancy loss and bad debt. NOI is defined as rental income less direct property rental expenses. Rental expenses include real estate taxes, insurance, personnel, utilities, repairs and maintenance, administrative and marketing. Excluded from NOI is property management expense, which is calculated as 2.75% of property revenue to cover the regional supervision and accounting costs related to consolidated property operations, and land rent. UDR’s chief operating decision maker utilizes NOI as the key measure of segment profit or loss.

UDR’s two reportable segments are Same-Store Communities and Non-Mature Communities/Other:

• Same-Store Communities represent those communities acquired, developed, and stabilized prior to January 1, 2016 and held as of March 31, 2017. A comparison of operating results from the prior year is meaningful as these communities were owned and had stabilized occupancy and operating expenses as of the beginning of the prior period, there is no plan to conduct substantial redevelopment activities, and the community is not held for disposition within the current year. A community is considered to have stabilized occupancy once it achieves 90% occupancy for at least three consecutive months.

• Non-Mature Communities/Other represent those communities that do not meet the criteria to be included in Same-Store Communities, including, but not limited to, recently acquired, developed and redeveloped communities, and the non-apartment components of mixed use properties.

Management evaluates the performance of each of our apartment communities on a Same-Store Community and Non-Mature Community/Other basis, as well as individually and geographically. This is consistent with the aggregation criteria under GAAP as each of our apartment communities generally has similar economic characteristics, facilities, services, and tenants. Therefore, the Company’s reportable segments have been aggregated by geography in a manner identical to that which is provided to the chief operating decision maker.

All revenues are from external customers and no single tenant or related group of tenants contributed 10% or more of UDR’s total revenues during the three months endedMarch 31, 2017 and 2016.

The following table details rental income and NOI for UDR’s reportable segments for the three months endedMarch 31, 2017 and 2016, and reconciles NOI to Net Income/(Loss) Attributable to UDR, Inc. in the Consolidated Statements of Operations (dollars in thousands):

	Three Months Ended
	March 31, (a)
	2017			2016
Reportable apartment home segment rental income
Same-Store Communities
West Region	$	82,220		$	78,409
Mid-Atlantic Region	52,109			50,154
Northeast Region	37,921			36,460
Southeast Region	28,657			27,137
Southwest Region	10,679			10,125
Non-Mature Communities/Other	29,685			29,672
Total segment and consolidated rental income	$	241,271		$	231,957
Reportable apartment home segment NOI
Same-Store Communities
West Region	$	61,895		$	59,146
Mid-Atlantic Region	36,315			33,729
Northeast Region	26,901			26,360
Southeast Region	19,661			18,797
Southwest Region	6,678			6,331
Non-Mature Communities/Other	20,033			19,771
Total segment and consolidated NOI	171,483			164,134
Reconciling items:
Joint venture management and other fees	2,570			2,858
Property management	(6,635		)	(6,379		)
Other operating expenses	(1,691		)	(1,752		)
Real estate depreciation and amortization	(105,032		)	(105,339		)
General and administrative	(13,075		)	(13,844		)
Casualty-related (charges)/recoveries, net	(502		)	—
Other depreciation and amortization	(1,608		)	(1,553		)
Income/(loss) from unconsolidated entities	11,198			679
Interest expense	(30,539		)	(31,104		)
Interest income and other income/(expense), net	427			431
Tax (provision)/benefit, net	(332		)	403
Gain/(loss) on sale of real estate owned, net of tax	2,132			3,070
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(2,338		)	(905		)
Net (income)/loss attributable to noncontrolling interests	(91		)	(306		)
Net income/(loss) attributable to UDR, Inc.	$	25,967		$	10,393

(a) Same-Store Community population consisted of 35,689 apartment homes.

The following table details the assets of UDR’s reportable segments as of March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Reportable apartment home segment assets:
Same-Store Communities:
West Region	$	2,944,437		$	2,938,073
Mid-Atlantic Region	2,221,312			2,216,067
Northeast Region	1,858,432			1,857,193
Southeast Region	750,147			746,762
Southwest Region	283,979			283,260
Non-Mature Communities/Other	1,729,262			1,574,398
Total segment assets	9,787,569			9,615,753
Accumulated depreciation	(3,026,660		)	(2,923,625		)
Total segment assets — net book value	6,760,909			6,692,128
Reconciling items:
Cash and cash equivalents	2,460			2,112
Restricted cash	19,757			19,994
Notes receivable, net	19,790			19,790
Investment in and advances to unconsolidated joint ventures, net	818,990			827,025
Other assets	114,005			118,535
Total consolidated assets	$	7,735,911		$	7,679,584

Capital expenditures related to our Same-Store Communities totaled $15.3 million and $12.9 million for the three months endedMarch 31, 2017 and 2016, respectively. Capital expenditures related to our Non-Mature Communities/Other totaled $0.8 million and $2.7 million for the three months endedMarch 31, 2017 and 2016, respectively.

Markets included in the above geographic segments are as follows:

i. West Region — San Francisco, Orange County, Seattle, Los Angeles, Monterey Peninsula, Other Southern California and Portland

ii. Mid-Atlantic Region — Metropolitan D.C., Richmond and Baltimore

iii. Northeast Region — New York and Boston

iv. Southeast Region — Orlando, Tampa, Nashville and Other Florida

v. Southwest Region — Dallas and Austin

United Dominion Reality L.P. [Member]

Entity Information [Line Items]

REPORTABLE SEGMENTS

REPORTABLE SEGMENTS

GAAP guidance requires that segment disclosures present the measure(s) used by the chief operating decision maker to decide how to allocate resources and for purposes of assessing such segments’ performance. The Operating Partnership has the same chief operating decision maker as that of its parent, the General Partner. The chief operating decision maker consists of several members of UDR’s executive management team who use several generally accepted industry financial measures to assess the performance of the business for our reportable operating segments.

The Operating Partnership owns and operates multifamily apartment communities throughout the United States that generate rental and other property related income through the leasing of apartment homes to a diverse base of tenants. The primary financial measures of the Operating Partnership’s apartment communities are rental income and net operating income ("NOI"), and are included in the chief operating decision maker’s assessment of the Operating Partnership’s performance on a consolidated basis. Rental income represents gross market rent less adjustments for concessions, vacancy loss and bad debt. NOI is defined as total revenues less direct property operating expenses. Rental expenses include real estate taxes, insurance, personnel, utilities, repairs and maintenance, administrative and marketing. Excluded from NOI are property management costs, which are the Operating Partnership’s allocable share of costs incurred by the General Partner for shared services of corporate level property management employees and related support functions and costs. The chief operating decision maker of the General Partner utilizes NOI as the key measure of segment profit or loss.

The Operating Partnership’s two reportable segments are Same-Store Communities and Non-Mature Communities/Other:

• Same-Store Communities represent those communities acquired, developed, and stabilized prior to January 1, 2016 and held as of March 31, 2017. A comparison of operating results from the prior year is meaningful as these communities were owned and had stabilized occupancy and operating expenses as of the beginning of the prior period, there is no plan to conduct substantial redevelopment activities, and the community is not held for disposition within the current year. A community is considered to have stabilized occupancy once it achieves 90% occupancy for at least 3 consecutive months.

• Non-Mature Communities/Other represent those communities that do not meet the criteria to be included in Same-Store Communities, including, but not limited to, recently acquired, developed and redeveloped communities, and the non-apartment components of mixed use properties.

Management of the General Partner evaluates the performance of each of the Operating Partnership’s apartment communities on a Same-Store Community and Non-Mature Community/Other basis, as well as individually and geographically. This is consistent with the aggregation criteria under GAAP as each of our apartment communities generally has similar economic characteristics, facilities, services, and tenants. Therefore, the Operating Partnership’s reportable segments have been aggregated by geography in a manner identical to that which is provided to the chief operating decision maker.

All revenues are from external customers and no single tenant or related group of tenants contributed 10% or more of the Operating Partnership’s total revenues during the three months endedMarch 31, 2017 and 2016.

The following table details rental income and NOI for the Operating Partnership’s reportable segments for the three months endedMarch 31, 2017 and 2016, and reconciles NOI to Net income/(loss) attributable to OP unitholders in the Consolidated Statements of Operations (dollars in thousands):

	Three Months Ended
	March 31, (a)
	2017			2016
Reportable apartment home segment rental income
Same-Store Communities
West Region	$	50,482		$	47,636
Mid-Atlantic Region	14,748			14,167
Northeast Region	13,559			13,006
Southeast Region	12,271			11,696
Non-Mature Communities/Other	11,545			12,281
Total segment and consolidated rental income	$	102,605		$	98,786
Reportable apartment home segment NOI
Same-Store Communities
West Region	$	38,445		$	36,159
Mid-Atlantic Region	10,095			9,362
Northeast Region	10,131			10,057
Southeast Region	8,283			8,043
Non-Mature Communities/Other	8,109			8,931
Total segment and consolidated NOI	75,063			72,552
Reconciling items:
Property management	(2,822		)	(2,717		)
Other operating expenses	(1,548		)	(1,500		)
Real estate depreciation and amortization	(36,879		)	(36,791		)
General and administrative	(5,219		)	(5,421		)
Casualty-related recoveries/(charges), net	(553		)	—
Income/(loss) from unconsolidated entities	(5,424		)	(13,387		)
Interest expense	(8,611		)	(7,605		)
Net (income)/loss attributable to noncontrolling interests	(350		)	(344		)
Net income/(loss) attributable to OP unitholders	$	13,657		$	4,787

(a)Same-Store Community population consisted of 15,058 apartment homes.

The following table details the assets of the Operating Partnership’s reportable segments as of March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Reportable apartment home segment assets
Same-Store Communities
West Region	$	1,601,136		$	1,596,815
Mid-Atlantic Region	656,850			655,693
Northeast Region	675,407			674,928
Southeast Region	330,214			328,729
Non-Mature Communities/Other	422,727			418,539
Total segment assets	3,686,334			3,674,704
Accumulated depreciation	(1,445,528		)	(1,408,815		)
Total segment assets - net book value	2,240,806			2,265,889
Reconciling items:
Cash and cash equivalents	864			756
Restricted cash	12,141			11,694
Investment in unconsolidated entities	103,267			112,867
Other assets	21,475			24,329
Total consolidated assets	$	2,378,553		$	2,415,535

Capital expenditures related to the Operating Partnership’s Same-Store Communities totaled $8.0 million and $5.3 million for the three months endedMarch 31, 2017 and 2016, respectively. Capital expenditures related to the Operating Partnership’s Non-Mature Communities/Other totaled $0.4 million and $0.3 million for the three months endedMarch 31, 2017 and 2016, respectively.

Markets included in the above geographic segments are as follows:

i. West Region — San Francisco, Orange County, Seattle, Los Angeles, Monterey Peninsula, Other Southern California and Portland

ii. Mid-Atlantic Region — Metropolitan, D.C. and Baltimore

iii. Northeast Region — New York and Boston

iv. Southeast Region — Tampa, Nashville and Other Florida

XML

Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

Comprehensive Income, Policy [Policy Text Block]

Comprehensive Income/(Loss)

Comprehensive income/(loss), which is defined as the change in equity during each period from transactions and other events and circumstances from nonowner sources, including all changes in equity during a period except for those resulting from investments by or distributions to stockholders, is displayed in the accompanying Consolidated Statements of Comprehensive Income/(Loss). For the three months endedMarch 31, 2017 and 2016, the Company’s other comprehensive income/(loss) consisted of the gain/(loss) (effective portion) on derivative instruments that are designated as and qualify as cash flow hedges, (gain)/loss on derivative instruments reclassified from other comprehensive income/(loss) into earnings, and the allocation of other comprehensive income/(loss) to noncontrolling interests. The (gain)/loss on derivative instruments reclassified from other comprehensive income/(loss) is included in Interest expense on the Consolidated Statements of Operations. See Note 10, Derivatives and Hedging Activity, for further discussion.

New Accounting Pronouncements, Policy [Policy Text Block]

Recent Accounting Pronouncements

In January 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2017-01, Business Combinations (Topic 805), Clarifying the Definition of a Business. The ASU changes the definition of a business to assist entities with evaluating whether a set of transferred assets is a business. As a result, the accounting for acquisitions of real estate could be impacted. The updated standard will be effective for the Company on January 1, 2018; early adoption is permitted. The ASU will be applied prospectively to any transactions occurring within the period of adoption. The Company expects that the updated standard will result in fewer acquisitions of real estate meeting the definition of a business and fewer acquisition-related costs being expensed in the period incurred.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash. The ASU addresses the presentation of restricted cash and restricted cash equivalents in the statement of cash flows. The updated standard will be effective for the Company on January 1, 2018 and must be applied retrospectively to all periods presented; early adoption is permitted. The Company does not expect the updated standard to have a material impact on the consolidated financial statements and related disclosures.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230), Classification of Certain Cash Receipts and Cash Payments. The ASU addresses specific cash flow items with the objective of reducing existing diversity in practice, including the treatment of distributions received from equity method investees. The updated standard will be effective for the Company on January 1, 2018 and must be applied retrospectively to all periods presented; early adoption is permitted.

The Company elected to early adopt ASU 2016-15 in 2016 and elected to classify distributions received from equity method investees using the cumulative earnings approach. As a result, for the three months ended March 31, 2016, the following amounts classified under the adopted ASU as returns on investment in unconsolidated joint ventures were reclassified on the Consolidated Statements of Cash Flow (in thousands):

	Three Months Ended
	March 31, 2016
Return on investment in unconsolidated joint ventures - as previously presented	$	—
Return on investment in unconsolidated joint ventures	272
Return on investment in unconsolidated joint ventures - as presented herein	$	272
Distributions received from unconsolidated joint ventures - as previously presented	$	7,983
Return on investment in unconsolidated joint ventures	(272		)
Distributions received from unconsolidated joint ventures - as presented herein	$	7,711

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments. The standard requires entities to estimate a lifetime expected credit loss for most financial assets, including trade and other receivables, held-to-maturity debt securities, loans and other financial instruments, and to present the net amount of the financial instrument expected to be collected. The updated standard will be effective for the Company on January 1, 2020; early adoption is permitted on January 1, 2019. The Company is currently evaluating the effect that the updated standard will have on the consolidated financial statements and related disclosures.

In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718), Improvements to Employee Share-Based Payment Accounting. The ASU aims to simplify the accounting for share-based payments by amending the accounting for forfeitures, statutory tax withholding requirements, classification in the statements of cash flow and income taxes. The updated standard was effective for the Company on January 1, 2017, at which time the Company prospectively began accounting for forfeitures as incurred and began applying the updated rules for statutory withholdings. As a result of adopting the ASU, the Company recorded a one-time adjustment for existing estimated forfeitures of $0.6 million as of January 1, 2017 to Distributions in Excess of Net Income on January 1, 2017.

In February 2016, the FASB issued ASU No. 2016-02, Leases. The standard amends the existing lease accounting guidance and requires lessees to recognize a lease liability and a right-of-use asset for all leases (except for short-term leases that have a duration of one year or less) on their balance sheets. Lessees will continue to recognize lease expense in a manner similar to current accounting. For lessors, accounting for leases under the new guidance is substantially the same as in prior periods, but eliminates current real estate-specific provisions and changes the treatment of initial direct costs. Entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparable period presented, with an option to elect certain transition relief. Full retrospective application is prohibited. The standard will be effective for the Company on January 1, 2019, with early adoption permitted. While the Company is currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures, we expect to recognize right-of-use assets and related lease liabilities on our consolidated balance sheets related to ground leases on any communities where we are the lessee.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers. The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective, including industry-specific revenue guidance. The standard specifically excludes lease contracts. The ASU allows for the use of either the full or modified retrospective transition method and will be effective for the Company on January 1, 2018, at which time the Company expects to adopt the updated standard using the modified retrospective approach. However, as the majority of the Company’s revenue is from rental income related to leases, the Company does not expect the ASU to have a material impact on the consolidated financial statements and related disclosures.

Principles of Consolidation

The Company accounts for subsidiary partnerships, joint ventures and other similar entities in which it holds an ownership interest in accordance with the consolidation guidance. The Company first evaluates whether each entity is a variable interest entity ("VIE"). Under the VIE model, the Company consolidates an entity when it has control to direct the activities of the VIE and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. Under the voting model, the Company consolidates an entity when it controls the entity through ownership of a majority voting interest.

Discontinued Operations

In accordance with GAAP, a discontinued operation represents (1) a component of an entity or group of components that has been disposed of or is classified as held for sale in a single transaction and represents a strategic shift that has or will have a major effect on an entity’s financial results, or (2) an acquired business that is classified as held for sale on the date of acquisition. A strategic shift could include a disposal of (1) a separate major line of business, (2) a separate major geographic area of operations, (3) a major equity method investment, or (4) other major parts of an entity.

We record sales of real estate that do not meet the definition of a discontinued operation in Gain/(loss) on sale of real estate owned, net of taxon the Consolidated Statements of Operations.

Revenue and real estate sales gain recognition

Revenue and Real Estate Sales Gain Recognition

Rental income related to leases is recognized on an accrual basis when due from residents and tenants in accordance with GAAP. Rental payments are generally due on a monthly basis and recognized when earned. The Company recognizes interest income, management and other fees and incentives when earned, and the amounts are fixed and determinable.

For sale transactions meeting the requirements for full accrual profit recognition, we remove the related assets and liabilities from our Consolidated Balance Sheets and record the gain or loss in the period the transaction closes. For sale transactions that do not meet the full accrual sale criteria due to our continuing involvement, we evaluate the nature of the continuing involvement and account for the transaction under an alternate method of accounting. Unless certain limited criteria are met, non-monetary transactions, including property exchanges, are accounted for at fair value.

Sales to entities in which we retain or otherwise own an interest are accounted for as partial sales. If all other requirements for recognizing profit under the full accrual method have been satisfied and no other forms of continuing involvement are present, we recognize profit proportionate to the outside interest of the buyer and defer the gain on the interest we retain. The Company recognizes any deferred gain when the property is sold to a third party. In transactions accounted for by us as partial sales, we determine if the buyer of the majority equity interest in the venture was provided a preference as to cash flows in either an operating or a capital waterfall. If a cash flow preference has been provided, we recognize profit only to the extent that proceeds from the sale of the majority equity interest exceed costs related to the entire propert

Income Taxes

Income Taxes

Due to the structure of the Company as a REIT and the nature of the operations for the operating properties, no provision for federal income taxes has been provided for at UDR. Historically, the Company has generally incurred only state and local excise and franchise taxes. UDR has elected for certain consolidated subsidiaries to be treated as taxable REIT subsidiaries (“TRS”).

Income taxes for our TRS are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities from a change in tax rate is recognized in earnings in the period of the enactment date. The Company’s deferred tax assets are generally the result of differing depreciable lives on capitalized assets and timing of expense recognition for certain accrued liabilities. As of March 31, 2017 and December 31, 2016, UDR’s net deferred tax asset was $0.4 million and $0.6 million, respectively.

GAAP defines a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. GAAP also provides guidance on derecognition, classification, interest and penalties, accounting for interim periods, disclosure and transition.

The Company recognizes its tax positions and evaluates them using a two-step process. First, UDR determines whether a tax position is more likely than not (greater than 50 percent probability) to be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. Second, the Company will determine the amount of benefit to recognize and record the amount that is more likely than not to be realized upon ultimate settlement.

UDR had no material unrecognized tax benefit, accrued interest or penalties at March 31, 2017. UDR and its subsidiaries are subject to federal income tax as well as income tax of various state and local jurisdictions. The tax years 2013 through 2016 remain open to examination by tax jurisdictions to which we are subject. When applicable, UDR recognizes interest and/or penalties related to uncertain tax positions in Tax (provision)/benefit, net on the Consolidated Statements of Operations.

Policy Loans Receivable, Policy [Policy Text Block]

Notes Receivable

The following table summarizes our notes receivable, net as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	Interest rate at		Balance outstanding
	March 31, 2017		March 31, 2017		December 31, 2016
Note due February 2020 (a)	10.00	%	$	12,994	$	12,994
Note due July 2017 (b)	8.00	%	2,500		2,500
Note due October 2020 (c)	8.00	%	1,296		1,296
Note due April 2021 (d)	10.00	%	3,000		3,000
Total notes receivable, net			$	19,790	$	19,790

(a) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $13.0 million. Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $5.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the eighth anniversary of the date of the note (February 2020).

(b) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $2.5 million. Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $5.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (July 2017).

(c) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $2.0 million, of which, $1.3 million has been funded. Interest payments are due when the loan matures. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $10.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (October 2020).

(d) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $15.0 million, of which, $3.0 million has been funded. Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $25.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (April 2021).

The Company recognized $0.5 million and $0.4 million of interest income from notes receivable during the three months endedMarch 31, 2017 and 2016, respectively, none of which was related party interest income. Interest income is included in Interest income and other income/(expense), net on the Consolidated Statements of Operations.

XML

Significant Accounting Policies (UNITED DOMINION REALTY, L.P.) (Policies)

3 Months Ended

Mar. 31, 2017

Entity Information [Line Items]

New Accounting Pronouncements, Policy [Policy Text Block]

Recent Accounting Pronouncements

In January 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2017-01, Business Combinations (Topic 805), Clarifying the Definition of a Business. The ASU changes the definition of a business to assist entities with evaluating whether a set of transferred assets is a business. As a result, the accounting for acquisitions of real estate could be impacted. The updated standard will be effective for the Company on January 1, 2018; early adoption is permitted. The ASU will be applied prospectively to any transactions occurring within the period of adoption. The Company expects that the updated standard will result in fewer acquisitions of real estate meeting the definition of a business and fewer acquisition-related costs being expensed in the period incurred.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash. The ASU addresses the presentation of restricted cash and restricted cash equivalents in the statement of cash flows. The updated standard will be effective for the Company on January 1, 2018 and must be applied retrospectively to all periods presented; early adoption is permitted. The Company does not expect the updated standard to have a material impact on the consolidated financial statements and related disclosures.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230), Classification of Certain Cash Receipts and Cash Payments. The ASU addresses specific cash flow items with the objective of reducing existing diversity in practice, including the treatment of distributions received from equity method investees. The updated standard will be effective for the Company on January 1, 2018 and must be applied retrospectively to all periods presented; early adoption is permitted.

The Company elected to early adopt ASU 2016-15 in 2016 and elected to classify distributions received from equity method investees using the cumulative earnings approach. As a result, for the three months ended March 31, 2016, the following amounts classified under the adopted ASU as returns on investment in unconsolidated joint ventures were reclassified on the Consolidated Statements of Cash Flow (in thousands):

	Three Months Ended
	March 31, 2016
Return on investment in unconsolidated joint ventures - as previously presented	$	—
Return on investment in unconsolidated joint ventures	272
Return on investment in unconsolidated joint ventures - as presented herein	$	272
Distributions received from unconsolidated joint ventures - as previously presented	$	7,983
Return on investment in unconsolidated joint ventures	(272		)
Distributions received from unconsolidated joint ventures - as presented herein	$	7,711

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments. The standard requires entities to estimate a lifetime expected credit loss for most financial assets, including trade and other receivables, held-to-maturity debt securities, loans and other financial instruments, and to present the net amount of the financial instrument expected to be collected. The updated standard will be effective for the Company on January 1, 2020; early adoption is permitted on January 1, 2019. The Company is currently evaluating the effect that the updated standard will have on the consolidated financial statements and related disclosures.

In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718), Improvements to Employee Share-Based Payment Accounting. The ASU aims to simplify the accounting for share-based payments by amending the accounting for forfeitures, statutory tax withholding requirements, classification in the statements of cash flow and income taxes. The updated standard was effective for the Company on January 1, 2017, at which time the Company prospectively began accounting for forfeitures as incurred and began applying the updated rules for statutory withholdings. As a result of adopting the ASU, the Company recorded a one-time adjustment for existing estimated forfeitures of $0.6 million as of January 1, 2017 to Distributions in Excess of Net Income on January 1, 2017.

In February 2016, the FASB issued ASU No. 2016-02, Leases. The standard amends the existing lease accounting guidance and requires lessees to recognize a lease liability and a right-of-use asset for all leases (except for short-term leases that have a duration of one year or less) on their balance sheets. Lessees will continue to recognize lease expense in a manner similar to current accounting. For lessors, accounting for leases under the new guidance is substantially the same as in prior periods, but eliminates current real estate-specific provisions and changes the treatment of initial direct costs. Entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparable period presented, with an option to elect certain transition relief. Full retrospective application is prohibited. The standard will be effective for the Company on January 1, 2019, with early adoption permitted. While the Company is currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures, we expect to recognize right-of-use assets and related lease liabilities on our consolidated balance sheets related to ground leases on any communities where we are the lessee.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers. The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective, including industry-specific revenue guidance. The standard specifically excludes lease contracts. The ASU allows for the use of either the full or modified retrospective transition method and will be effective for the Company on January 1, 2018, at which time the Company expects to adopt the updated standard using the modified retrospective approach. However, as the majority of the Company’s revenue is from rental income related to leases, the Company does not expect the ASU to have a material impact on the consolidated financial statements and related disclosures.

Principles of Consolidation

The Company accounts for subsidiary partnerships, joint ventures and other similar entities in which it holds an ownership interest in accordance with the consolidation guidance. The Company first evaluates whether each entity is a variable interest entity ("VIE"). Under the VIE model, the Company consolidates an entity when it has control to direct the activities of the VIE and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. Under the voting model, the Company consolidates an entity when it controls the entity through ownership of a majority voting interest.

Discontinued Operations

In accordance with GAAP, a discontinued operation represents (1) a component of an entity or group of components that has been disposed of or is classified as held for sale in a single transaction and represents a strategic shift that has or will have a major effect on an entity’s financial results, or (2) an acquired business that is classified as held for sale on the date of acquisition. A strategic shift could include a disposal of (1) a separate major line of business, (2) a separate major geographic area of operations, (3) a major equity method investment, or (4) other major parts of an entity.

We record sales of real estate that do not meet the definition of a discontinued operation in Gain/(loss) on sale of real estate owned, net of taxon the Consolidated Statements of Operations.

Revenue and real estate sales gain recognition

Revenue and Real Estate Sales Gain Recognition

Rental income related to leases is recognized on an accrual basis when due from residents and tenants in accordance with GAAP. Rental payments are generally due on a monthly basis and recognized when earned. The Company recognizes interest income, management and other fees and incentives when earned, and the amounts are fixed and determinable.

For sale transactions meeting the requirements for full accrual profit recognition, we remove the related assets and liabilities from our Consolidated Balance Sheets and record the gain or loss in the period the transaction closes. For sale transactions that do not meet the full accrual sale criteria due to our continuing involvement, we evaluate the nature of the continuing involvement and account for the transaction under an alternate method of accounting. Unless certain limited criteria are met, non-monetary transactions, including property exchanges, are accounted for at fair value.

Sales to entities in which we retain or otherwise own an interest are accounted for as partial sales. If all other requirements for recognizing profit under the full accrual method have been satisfied and no other forms of continuing involvement are present, we recognize profit proportionate to the outside interest of the buyer and defer the gain on the interest we retain. The Company recognizes any deferred gain when the property is sold to a third party. In transactions accounted for by us as partial sales, we determine if the buyer of the majority equity interest in the venture was provided a preference as to cash flows in either an operating or a capital waterfall. If a cash flow preference has been provided, we recognize profit only to the extent that proceeds from the sale of the majority equity interest exceed costs related to the entire propert

Comprehensive Income, Policy [Policy Text Block]

Comprehensive Income/(Loss)

Comprehensive income/(loss), which is defined as the change in equity during each period from transactions and other events and circumstances from nonowner sources, including all changes in equity during a period except for those resulting from investments by or distributions to stockholders, is displayed in the accompanying Consolidated Statements of Comprehensive Income/(Loss). For the three months endedMarch 31, 2017 and 2016, the Company’s other comprehensive income/(loss) consisted of the gain/(loss) (effective portion) on derivative instruments that are designated as and qualify as cash flow hedges, (gain)/loss on derivative instruments reclassified from other comprehensive income/(loss) into earnings, and the allocation of other comprehensive income/(loss) to noncontrolling interests. The (gain)/loss on derivative instruments reclassified from other comprehensive income/(loss) is included in Interest expense on the Consolidated Statements of Operations. See Note 10, Derivatives and Hedging Activity, for further discussion.

Income taxes

Income Taxes

Due to the structure of the Company as a REIT and the nature of the operations for the operating properties, no provision for federal income taxes has been provided for at UDR. Historically, the Company has generally incurred only state and local excise and franchise taxes. UDR has elected for certain consolidated subsidiaries to be treated as taxable REIT subsidiaries (“TRS”).

Income taxes for our TRS are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities from a change in tax rate is recognized in earnings in the period of the enactment date. The Company’s deferred tax assets are generally the result of differing depreciable lives on capitalized assets and timing of expense recognition for certain accrued liabilities. As of March 31, 2017 and December 31, 2016, UDR’s net deferred tax asset was $0.4 million and $0.6 million, respectively.

GAAP defines a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. GAAP also provides guidance on derecognition, classification, interest and penalties, accounting for interim periods, disclosure and transition.

The Company recognizes its tax positions and evaluates them using a two-step process. First, UDR determines whether a tax position is more likely than not (greater than 50 percent probability) to be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. Second, the Company will determine the amount of benefit to recognize and record the amount that is more likely than not to be realized upon ultimate settlement.

UDR had no material unrecognized tax benefit, accrued interest or penalties at March 31, 2017. UDR and its subsidiaries are subject to federal income tax as well as income tax of various state and local jurisdictions. The tax years 2013 through 2016 remain open to examination by tax jurisdictions to which we are subject. When applicable, UDR recognizes interest and/or penalties related to uncertain tax positions in Tax (provision)/benefit, net on the Consolidated Statements of Operations.

United Dominion Reality L.P. [Member]

Entity Information [Line Items]

New Accounting Pronouncements, Policy [Policy Text Block]

Recent Accounting Pronouncements

In January 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2017-01, Business Combinations (Topic 805), Clarifying the Definition of a Business. The ASU changes the definition of a business to assist entities with evaluating whether a set of transferred assets is a business. As a result, the accounting for acquisitions of real estate could be impacted. The updated standard will be effective for the Operating Partnership on January 1, 2018; early adoption is permitted. The ASU will be applied prospectively to any transactions occurring within the period of adoption. The Operating Partnership expects that the updated standard will result in fewer acquisitions of real estate meeting the definition of a business and fewer acquisition-related costs being expensed in the period incurred.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash. The ASU addresses the presentation of restricted cash and restricted cash equivalents in the statement of cash flows. The updated standard will be effective for the Operating Partnership on January 1, 2018 and must be applied retrospectively to all periods presented; early adoption is permitted. The Operating Partnership does not expect the updated standard to have a material impact on the consolidated financial statements and related disclosures.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230), Classification of Certain Cash Receipts and Cash Payments. The ASU addresses specific cash flow items with the objective of reducing existing diversity in practice, including the treatment of distributions received from equity method investees. The updated standard will be effective for the Operating Partnership on January 1, 2018 and must be applied retrospectively to all periods presented; early adoption is permitted. The Operating Partnership elected to early adopt ASU 2016-15 in 2016. The adoption did not have an impact on the Operating Partnership's consolidated financial statements and related disclosures.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments. The standard requires entities to estimate a lifetime expected credit loss for most financial assets, including trade and other receivables, held-to-maturity debt securities, loans and other financial instruments, and to present the net amount of the financial instrument expected to be collected. The updated standard will be effective for the Operating Partnership on January 1, 2020; early adoption is permitted on January 1, 2019. The Operating Partnership is currently evaluating the effect that the updated standard will have on the consolidated financial statements and related disclosures.

In February 2016, the FASB issued ASU No. 2016-02, Leases. The standard amends the existing lease accounting guidance and requires lessees to recognize a lease liability and a right-of-use asset for all leases (except for short-term leases that have a duration of one year or less) on their balance sheets. Lessees will continue to recognize lease expense in a manner similar to current accounting. For lessors, accounting for leases under the new guidance is substantially the same as in prior periods, but eliminates current real estate-specific provisions and changes the treatment of initial direct costs. Entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparable period presented, with an option to elect certain transition relief. Full retrospective application is prohibited. The standard will be effective for the Operating Partnership on January 1, 2019, with early adoption permitted. While the Operating Partnership is currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures, we expect to recognize right-of-use assets and related lease liabilities on our consolidated balance sheets related to ground leases on any communities where we are the lessee.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers. The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective, including industry-specific revenue guidance. The standard specifically excludes lease contracts. The ASU allows for the use of either the full or modified retrospective transition method and will be effective for the Operating Partnership on January 1, 2018, at which time the Operating Partnership expects to adopt the updated standard using the modified retrospective approach. However, as the majority of the Operating Partnership's revenue is from rental income related to leases, the Operating Partnership does not expect the ASU to have a material impact on the consolidated financial statements and related disclosures.

Principles of Consolidation

The Operating Partnership accounts for subsidiary partnerships, joint ventures and other similar entities in which it holds an ownership interest in accordance with the amended consolidation guidance. The Operating Partnership first evaluates whether each entity is a variable interest entity ("VIE"). Under the VIE model, the Operating Partnership consolidates an entity when it has control to direct the activities of the VIE and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. Under the voting model, the Operating Partnership consolidates an entity when it controls the entity through ownership of a majority voting interest.

Discontinued Operations

In accordance with GAAP, a discontinued operation represents (1) a component of an entity or group of components that has been disposed of or is classified as held for sale in a single transaction and represents a strategic shift that has or will have a major effect on an entity’s financial results, or (2) an acquired business that is classified as held for sale on the date of acquisition. A strategic shift could include a disposal of (1) a separate major line of business, (2) a separate major geographic area of operations, (3) a major equity method investment, or (4) other major parts of an entity.

We record sales of real estate that do not meet the definition of a discontinued operation in Gain/(loss) on sale of real estate owned, net of taxon the Consolidated Statements of Operations.

Earnings Per Share, Policy [Policy Text Block]

Income/(Loss) Per Operating Partnership Unit

Basic income/(loss) per OP Unit is computed by dividing net income/(loss) attributable to the general and limited partner unitholders by the weighted average number of general and limited partner units outstanding during the year. Diluted income/(loss) per OP Unit reflects the potential dilution that could occur if securities or other contracts to issue OP Units were exercised or converted into OP Units or resulted in the issuance of OP Units and then shared in the income/(loss) of the Operating Partnership.

Revenue and real estate sales gain recognition

Revenue and Real Estate Sales Gain Recognition

Rental income related to leases is recognized on an accrual basis when due from residents and tenants in accordance with GAAP. Rental payments are generally due on a monthly basis and recognized when earned. The Operating Partnership recognizes interest income, fees and incentives when earned, fixed and determinable.

For sale transactions meeting the requirements for full accrual profit recognition, we remove the related assets and liabilities from our Consolidated Balance Sheets and record the gain or loss in the period the transaction closes. For sale transactions that do not meet the full accrual sale criteria due to our continuing involvement, we evaluate the nature of the continuing involvement and account for the transaction under an alternate method of accounting. Unless certain limited criteria are met, non-monetary transactions, including property exchanges, are accounted for at fair value.

Sales to entities in which we or our General Partner retain or otherwise own an interest are accounted for as partial sales. If all other requirements for recognizing profit under the full accrual method have been satisfied and no other forms of continuing involvement are present, we recognize profit proportionate to the outside interest in the buyer and defer the gain on the interest we or our General Partner retain. The Operating Partnership recognizes any deferred gain when the property is sold to a third party. In transactions accounted by us as partial sales, we determine if the buyer of the majority equity interest in the venture was provided a preference as to cash flows in either an operating or a capital waterfall. If a cash flow preference has been provided, we recognize profit only to the extent that proceeds from the sale of the majority equity interest exceed costs related to the entire property.

Comprehensive Income, Policy [Policy Text Block]

Comprehensive Income/(Loss)

Comprehensive income/(loss), which is defined as the change in equity during each period from transactions and other events and circumstances from nonowner sources, including all changes in equity during a period except for those resulting from investments by or distributions to unitholders, is displayed in the accompanying Consolidated Statements of Comprehensive Income/(Loss). For the three months endedMarch 31, 2017 and 2016, the Operating Partnership’s other comprehensive income/(loss) consisted of the gain/(loss) (effective portion) on derivative instruments that are designated as and qualify as cash flow hedges and (gain)/loss reclassified from other comprehensive income/(loss) into earnings. The (gain)/loss reclassified from other comprehensive income/(loss) is included in Interest expense on the Consolidated Statements of Operations. See Note 8, Derivatives and Hedging Activity, for further discussion.

Income taxes

Income Taxes

The taxable income or loss of the Operating Partnership is reported on the tax returns of the partners. Accordingly, no provision has been made in the accompanying financial statements for federal or state income taxes on income that is passed through to the partners. However, any state or local revenue, excise or franchise taxes that result from the operating activities of the Operating Partnership are recorded at the entity level. The Operating Partnership’s tax returns are subject to examination by federal and state taxing authorities. Net income for financial reporting purposes differs from the net income for income tax reporting purposes primarily due to temporary differences, principally real estate depreciation and the tax deferral of certain gains on property sales. The differences in depreciation result from differences in the book and tax basis of certain real estate assets and the differences in the methods of depreciation and lives of the real estate assets.

The Operating Partnership evaluates the accounting and disclosure of tax positions taken or expected to be taken in the course of preparing the Operating Partnership’s tax returns to determine whether the tax positions are “more-likely-than-not” of being sustained by the applicable tax authority. Tax positions not deemed to meet the more-likely-than-not threshold would be recorded as a tax benefit or expense in the current year. Management of the Operating Partnership is required to analyze all open tax years, as defined by the statute of limitations, for all major jurisdictions, which include federal and certain states. The Operating Partnership has no examinations in progress and none are expected at this time.

Management of the Operating Partnership has reviewed all open tax years (2013 through 2016) of tax jurisdictions and concluded there is no tax liability resulting from unrecognized tax benefits relating to uncertain income tax positions taken or expected to be taken in future tax returns.

XML

Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

Notes receivable

The following table summarizes our notes receivable, net as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	Interest rate at		Balance outstanding
	March 31, 2017		March 31, 2017		December 31, 2016
Note due February 2020 (a)	10.00	%	$	12,994	$	12,994
Note due July 2017 (b)	8.00	%	2,500		2,500
Note due October 2020 (c)	8.00	%	1,296		1,296
Note due April 2021 (d)	10.00	%	3,000		3,000
Total notes receivable, net			$	19,790	$	19,790

XML

Real Estate Owned (Tables)

3 Months Ended

Mar. 31, 2017

Real Estate [Abstract]

Summary of carrying amounts for real estate owned (at cost)

The following table summarizes the carrying amounts for our real estate owned (at cost) as of March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Land	$	1,812,797		$	1,801,576
Depreciable property — held and used:
Land improvements	180,837			178,701
Building, improvements, and furniture, fixtures and equipment	7,400,098			7,291,570
Under development:
Land and land improvements	111,028			111,028
Building, improvements, and furniture, fixtures and equipment	282,809			231,254
Real estate held for disposition:
Land and land improvements	—			1,104
Building, improvements, and furniture, fixtures and equipment	—			520
Real estate owned	9,787,569			9,615,753
Accumulated depreciation	(3,026,660		)	(2,923,625		)
Real estate owned, net	$	6,760,909		$	6,692,128

XML

Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Tables)

3 Months Ended

Mar. 31, 2017

Entity Information [Line Items]

Summary of carrying amounts for real estate owned (at cost)

The following table summarizes the carrying amounts for our real estate owned (at cost) as of March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Land	$	1,812,797		$	1,801,576
Depreciable property — held and used:
Land improvements	180,837			178,701
Building, improvements, and furniture, fixtures and equipment	7,400,098			7,291,570
Under development:
Land and land improvements	111,028			111,028
Building, improvements, and furniture, fixtures and equipment	282,809			231,254
Real estate held for disposition:
Land and land improvements	—			1,104
Building, improvements, and furniture, fixtures and equipment	—			520
Real estate owned	9,787,569			9,615,753
Accumulated depreciation	(3,026,660		)	(2,923,625		)
Real estate owned, net	$	6,760,909		$	6,692,128

United Dominion Reality L.P. [Member]

Entity Information [Line Items]

Summary of carrying amounts for real estate owned (at cost)

The following table summarizes the carrying amounts for our real estate owned (at cost) as of March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Land	$	837,945		$	836,644
Depreciable property — held and used:
Buildings, improvements, and furniture, fixtures and equipment	2,848,389			2,838,060
Real estate owned	3,686,334			3,674,704
Accumulated depreciation	(1,445,528		)	(1,408,815		)
Real estate owned, net	$	2,240,806		$	2,265,889

XML

Joint Ventures (Tables)

3 Months Ended

Mar. 31, 2017

Equity Method Investments and Joint Ventures [Abstract]

Combined Summary of Balance Sheets Relating to Unconsolidated Joint Ventures [Table Text Block]

We evaluate our investments in unconsolidated joint ventures and partnerships when events or changes in circumstances indicate that there may be an other-than-temporary decline in value. We consider various factors to determine if a decrease in the value of the investment is other-than-temporary. The Company did not recognize any other-than-temporary decreases in the value of its investments in unconsolidated joint ventures or partnerships during the three months endedMarch 31, 2017 and 2016.

Combined summary balance sheets relating to the unconsolidated joint ventures and partnerships (not just our proportionate share) are presented below as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	March 31, 2017		December 31, 2016
Total real estate, net	$	2,904,183	$	2,901,067
Cash and cash equivalents	28,676		32,503
Other assets	17,288		19,047
Total assets	$	2,950,147	$	2,952,617
Amount due to/(from) UDR	$	2,746	$	521
Third party debt, net	1,811,490		1,794,379
Accounts payable and accrued liabilities	55,471		66,391
Total liabilities	$	1,869,707	$	1,861,291
Total equity	$	1,080,440	$	1,091,326

Schedule of Equity Method Investments [Table Text Block]

The following table summarizes the Company’s investment in and advances to unconsolidated joint ventures and partnerships, net, which are accounted for under the equity method of accounting as of March 31, 2017 and December 31, 2016(dollars in thousands):

Joint Venture	Location of Properties	Number of Properties	Number of Apartment Homes	Investment at				UDR’s Ownership Interest
		March 31, 2017	March 31, 2017	March 31, 2017		December 31, 2016		March 31, 2017			December 31, 2016
Operating and development:
UDR/MetLife I	Los Angeles, CA	1 development community (a)	150	$	29,182	$	25,209	50.0		%	50.0		%
UDR/MetLife II (b)	Various	18 operating communities	4,059	309,409		311,282		50.0		%	50.0		%
Other UDR/MetLife Development Joint Ventures		1 operating community;
	Various	4 development communities (a)	1,437	156,096		160,979		50.6		%	50.6		%
UDR/MetLife Vitruvian Park®	Addison, TX	3 operating communities;
		1 development community (a);
		5 land parcels	1,513	73,154		72,414		50.0		%	50.0		%
UDR/KFH	Washington, D.C.	3 operating communities	660	11,801		12,835		30.0		%	30.0		%
Investment in and advances to unconsolidated joint ventures, net, before participating loan investment and preferred equity investment				$	579,642	$	582,719
								Income from investments for the three months ending March 31,
				Investment at
	Location	Rate	Years To Maturity	March 31, 2017		December 31, 2016		2017			2016
Participating loan investment:
Steele Creek	Denver, CO	6.5%	0.3	$	94,002	$	94,003	$	1,533		$	1,519
Preferred equity investment:
West Coast Development Joint Ventures (c)	Various	6.5% (c)	N/A	145,346		150,303		$	12,766		$	1,427
Total investment in and advances to unconsolidated joint ventures, net				$	818,990	$	827,025

(a) The number of apartment homes for the communities under development presented in the table above is based on the projected number of total homes upon completion of development. As of March 31, 2017, 1,018 apartment homes had been completed in Other UDR/MetLife Development Joint Ventures, and no apartment homes had been completed in UDR/MetLife I or in UDR/MetLife Vitruvian Park^®.

(b) In September 2015, the 717 Olympic community, which is owned by the UDR/MetLife II joint venture, experienced extensive water damage due to a ruptured water pipe. For the three months endedMarch 31, 2017 and 2016, the Company recorded casualty-related charges/(recoveries) of $0.9 million and $(1.1) million, respectively, representing its proportionate share of the total charges/(recoveries) recognized

Financial information relating to unconsolidated joint ventures operations

Combined summary financial information relating to the unconsolidated joint ventures’ and partnerships’ operations (not just our proportionate share) is presented below for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

	Three Months Ended
	March 31,
	2017			2016
Total revenues	$	58,524		$	55,037
Property operating expenses	(21,834		)	(23,413		)
Real estate depreciation and amortization	(23,333		)	(18,943		)
Operating income/(loss)	13,357			12,681
Interest expense	(17,690		)	(16,181		)
Net income/(loss)	$	(4,333	)	$	(3,500	)

Combined summary of balance sheets relating to unconsolidated joint ventures

JOINT VENTURES AND PARTNERSHIPS

UDR has entered into joint ventures and partnerships with unrelated third parties to acquire real estate assets that are either consolidated and included in Real estate owned on the Consolidated Balance Sheets or are accounted for under the equity method of accounting, and are included in Investment in and advances to unconsolidated joint ventures, net, on the Consolidated Balance Sheets. The Company consolidates the entities that we control as well as any variable interest entity where we are the primary beneficiary. In addition, the Company consolidates any joint venture or partnership in which we are the general partner or managing member and the third party does not have the ability to substantively participate in the decision-making process nor the ability to remove us as general partner or managing member without cause.

UDR’s joint ventures and partnerships are funded with a combination of debt and equity. Our losses are limited to our investment and except as noted below, the Company does not guarantee any debt, capital payout or other obligations associated with our joint ventures and partnerships.

The Company recognizes earnings or losses from our investments in unconsolidated joint ventures and partnerships consisting of our proportionate share of the net earnings or losses of the joint ventures and partnerships. In addition, we may earn fees for providing management services to the unconsolidated joint ventures and partnerships.

The following table summarizes the Company’s investment in and advances to unconsolidated joint ventures and partnerships, net, which are accounted for under the equity method of accounting as of March 31, 2017 and December 31, 2016(dollars in thousands):

Joint Venture	Location of Properties	Number of Properties	Number of Apartment Homes	Investment at				UDR’s Ownership Interest
		March 31, 2017	March 31, 2017	March 31, 2017		December 31, 2016		March 31, 2017			December 31, 2016
Operating and development:
UDR/MetLife I	Los Angeles, CA	1 development community (a)	150	$	29,182	$	25,209	50.0		%	50.0		%
UDR/MetLife II (b)	Various	18 operating communities	4,059	309,409		311,282		50.0		%	50.0		%
Other UDR/MetLife Development Joint Ventures		1 operating community;
	Various	4 development communities (a)	1,437	156,096		160,979		50.6		%	50.6		%
UDR/MetLife Vitruvian Park®	Addison, TX	3 operating communities;
		1 development community (a);
		5 land parcels	1,513	73,154		72,414		50.0		%	50.0		%
UDR/KFH	Washington, D.C.	3 operating communities	660	11,801		12,835		30.0		%	30.0		%
Investment in and advances to unconsolidated joint ventures, net, before participating loan investment and preferred equity investment				$	579,642	$	582,719
								Income from investments for the three months ending March 31,
				Investment at
	Location	Rate	Years To Maturity	March 31, 2017		December 31, 2016		2017			2016
Participating loan investment:
Steele Creek	Denver, CO	6.5%	0.3	$	94,002	$	94,003	$	1,533		$	1,519
Preferred equity investment:
West Coast Development Joint Ventures (c)	Various	6.5% (c)	N/A	145,346		150,303		$	12,766		$	1,427
Total investment in and advances to unconsolidated joint ventures, net				$	818,990	$	827,025

(a) The number of apartment homes for the communities under development presented in the table above is based on the projected number of total homes upon completion of development. As of March 31, 2017, 1,018 apartment homes had been completed in Other UDR/MetLife Development Joint Ventures, and no apartment homes had been completed in UDR/MetLife I or in UDR/MetLife Vitruvian Park^®.

(b) In September 2015, the 717 Olympic community, which is owned by the UDR/MetLife II joint venture, experienced extensive water damage due to a ruptured water pipe. For the three months endedMarch 31, 2017 and 2016, the Company recorded casualty-related charges/(recoveries) of $0.9 million and $(1.1) million, respectively, representing its proportionate share of the total charges/(recoveries) recognized.

(c) In May 2015, the Company entered into a joint venture agreement with an unaffiliated joint venture partner and agreed to pay $136.3 million for a 48% ownership interest in a portfolio of five communities that were under construction. The communities are located in three of the Company’s core, coastal markets: Seattle, Washington, Los Angeles and Orange County, California. UDR earns a 6.5% preferred return on its investment through each individual community’s date of stabilization, defined as when a community reaches 80% occupancy for 90 consecutive days, while the joint venture partner is allocated all operating income and expense during the pre-stabilization period. Upon stabilization, income and expense are shared based on each partner’s ownership percentage and the Company no longer receives a 6.5% preferred return on its investment in the stabilized community. The Company serves as property manager and earns a management fee during the lease-up phase and subsequent operation of each of the communities. The unaffiliated joint venture partner is the general partner of the joint venture and the developer of the communities.

At inception of the agreement, the Company had a fixed-price option to acquire the remaining interest in each community beginning one year after completion. If the options are exercised for all five communities, the Company’s total purchase price will be $597.4 million. In the event the Company does not exercise its options to purchase at least two communities, the unaffiliated joint venture partner will be entitled to earn a contingent disposition fee equal to a 6.5% return on its implied equity in the communities not acquired. The unaffiliated joint venture partner is providing certain guaranties and there are construction loans on all five communities.

During the three months endedMarch 31, 2017, the Company exercised its fixed-price option to purchase the joint venture partner’s ownership interest in one of the five communities, a 244 home operating community in Seattle, Washington, thereby increasing its ownership interest from 49% to 100%, for a cash purchase price of approximately $66.0 million. As a result, the Company consolidated the operating community and it is no longer accounted for as a preferred equity investment in an unconsolidated joint venture (see Note 4, Real Estate Owned). As a result of the consolidation, the Company recorded a gain on consolidation of $12.2 million, which is included in Income/(loss) from unconsolidated entities on the Consolidated Statements of Operations.

As of March 31, 2017, construction was completed on three of the four remaining communities. Two of the four remaining communities had achieved stabilization. The other two remaining communities have not achieved stabilization and the Company continues to receive a 6.5% preferred return on its investment in those communities.

In March 2017, the Company entered into an additional joint venture agreement with the unaffiliated joint venture partner and agreed to pay $15.5 million for a 49% ownership interest in a 155 home community that is currently under construction in Seattle, Washington (together with the May 2015 joint venture described above, the “West Coast Development Joint Ventures”). Consistent with the terms of the May 2015 joint venture agreement, UDR earns a 6.5% preferred return on its investment through the community’s date of stabilization, as defined above, while our joint venture partner is allocated all operating income and expense during the pre-stabilization period. Upon stabilization, income and expense will be shared based on each partner’s ownership percentage and the Company will no longer receive a 6.5% preferred return on its investment in the stabilized community. The Company will serve as property manager and will earn a management fee during the lease-up phase and subsequent operation of the community. The unaffiliated joint venture partner is the general partner and the developer of the community. The Company has concluded it does not control the joint venture and accounts for it under the equity method of accounting.

The Company has a fixed-price option to acquire the remaining interest in the community beginning one year after completion for a total price of $61.3 million. The unaffiliated joint venture partner is providing certain guaranties and there is a construction loan on the community.

The Company's recorded equity investment in the West Coast Development Joint Ventures at March 31, 2017 and December 31, 2016 of $145.3 million and $150.3 million, respectively, is inclusive of outside basis costs and our accrued but unpaid preferred return.

As of March 31, 2017 and December 31, 2016, the Company had deferred fees and deferred profit of $9.7 million and $9.5 million, respectively, which will be recognized through earnings over the weighted average life of the related properties, upon the disposition of the properties to a third party, or upon completion of certain development obligations.

The Company recognized management fees of $2.6 million and $2.8 million for the three months endedMarch 31, 2017 and 2016, respectively, for our management of the communities held by the joint ventures and partnerships. The management fees are included in Joint venture management and other fees on the Consolidated Statements of Operations.

The Company may, in the future, make additional capital contributions to certain of our joint ventures and partnerships should additional capital contributions be necessary to fund acquisitions or operations.

We evaluate our investments in unconsolidated joint ventures and partnerships when events or changes in circumstances indicate that there may be an other-than-temporary decline in value. We consider various factors to determine if a decrease in the value of the investment is other-than-temporary. The Company did not recognize any other-than-temporary decreases in the value of its investments in unconsolidated joint ventures or partnerships during the three months endedMarch 31, 2017 and 2016.

Combined summary balance sheets relating to the unconsolidated joint ventures and partnerships (not just our proportionate share) are presented below as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	March 31, 2017		December 31, 2016
Total real estate, net	$	2,904,183	$	2,901,067
Cash and cash equivalents	28,676		32,503
Other assets	17,288		19,047
Total assets	$	2,950,147	$	2,952,617
Amount due to/(from) UDR	$	2,746	$	521
Third party debt, net	1,811,490		1,794,379
Accounts payable and accrued liabilities	55,471		66,391
Total liabilities	$	1,869,707	$	1,861,291
Total equity	$	1,080,440	$	1,091,326

Combined summary financial information relating to the unconsolidated joint ventures’ and partnerships’ operations (not just our proportionate share) is presented below for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

	Three Months Ended
	March 31,
	2017			2016
Total revenues	$	58,524		$	55,037
Property operating expenses	(21,834		)	(23,413		)
Real estate depreciation and amortization	(23,333		)	(18,943		)
Operating income/(loss)	13,357			12,681
Interest expense	(17,690		)	(16,181		)
Net income/(loss)	$	(4,333	)	$	(3,500	)

XML

Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) (Tables)

3 Months Ended

Mar. 31, 2017

Schedule of Equity Method Investments [Line Items]

Summarized Income Statement Relating to Unconsolidated Joint Ventures [Table Text Block]

Combined summary financial information relating to the unconsolidated joint ventures’ and partnerships’ operations (not just our proportionate share) is presented below for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

	Three Months Ended
	March 31,
	2017			2016
Total revenues	$	58,524		$	55,037
Property operating expenses	(21,834		)	(23,413		)
Real estate depreciation and amortization	(23,333		)	(18,943		)
Operating income/(loss)	13,357			12,681
Interest expense	(17,690		)	(16,181		)
Net income/(loss)	$	(4,333	)	$	(3,500	)

United Dominion Reality L.P. [Member]

Schedule of Equity Method Investments [Line Items]

Summarized Income Statement Relating to Unconsolidated Joint Ventures [Table Text Block]

Combined summary balance sheets relating to all of the DownREIT Partnership (not just our proportionate share) are presented below as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	March 31, 2017		December 31, 2016
Total real estate, net	$	1,400,046	$	1,413,983
Cash and cash equivalents	35		66
Note receivable from the General Partner	126,500		126,500
Other assets	4,498		4,843
Total assets	$	1,531,079	$	1,545,392
Secured debt, net	442,172		443,607
Other liabilities	23,976		27,571
Total liabilities	466,148		471,178
Total capital	1,064,931		1,074,214
Total liabilities and capital	$	1,531,079	$	1,545,392

Combined summary financial information relating to all of the DownREIT Partnership (not just our proportionate share) is presented below for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

	Three Months Ended
	March 31,
	2017			2016
Rental income	$	33,298		$	31,617
Property operating expenses	(13,976		)	(14,269		)
Real estate depreciation and amortization	(20,608		)	(30,053		)
Operating income/(loss)	(1,286		)	(12,705		)
Interest expense	(3,860		)	(3,741		)
Interest income on note receivable from the General Partner	1,166			1,180
Net income/(loss)	$	(3,980	)	$	(15,266	)

XML

Secured and Unsecured Debt (Tables)

3 Months Ended

Mar. 31, 2017

Short-term Debt [Line Items]

Schedule of Short-term Debt [Table Text Block]

The following is a summary of short-term bank borrowings under the unsecured commercial paper program at March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Total unsecured commercial paper program	$	500,000		$	—
Borrowings outstanding at end of period	220,000			—
Weighted average daily borrowings during the period ended	80,228			—
Maximum daily borrowings during the period ended	220,000			—
Weighted average interest rate during the period ended	1.2		%	—		%
Interest rate at end of the period	1.2		%	—		%

Secured debt instruments

The following is a summary of our secured and unsecured debt at March 31, 2017 and December 31, 2016 (dollars in thousands):

							Three Months Ended
	Principal Outstanding						March 31, 2017
	March 31, 2017			December 31, 2016			Weighted Average Interest Rate		Weighted Average Years to Maturity	Number of Communities Encumbered
Secured Debt:
Fixed Rate Debt
Mortgage notes payable (a)	$	401,135		$	402,996		4.04	%	6.1	7
Fannie Mae credit facilities (b)	355,836			355,836			5.06	%	2.6	10
Deferred financing costs	(2,482		)	(2,681		)
Total fixed rate secured debt, net	754,489			756,151			4.53	%	4.4	17
Variable Rate Debt
Tax-exempt secured notes payable (c)	94,700			94,700			1.42	%	5.9	2
Fannie Mae credit facilities (b)	182,606			280,946			2.05	%	1.3	5
Deferred financing costs	(288		)	(939		)
Total variable rate secured debt, net	277,018			374,707			1.84	%	2.9	7
Total Secured Debt, net	1,031,507			1,130,858			3.80	%	4.0	24
Unsecured Debt:
Variable Rate Debt
Borrowings outstanding under unsecured credit facility due January 2020 (d) (h)	—			—			—	%	2.8
Borrowings outstanding under unsecured commercial paper program due April 2017 (e) (h)	220,000			—			1.24	%	0.0
Borrowings outstanding under unsecured working capital credit facility due January 2019 (f)	36,140			21,350			1.88	%	1.8
Term Loan Facility due January 2021 (d) (h)	35,000			35,000			1.73	%	3.8
Fixed Rate Debt
4.25% Medium-Term Notes due June 2018 (net of discounts of $501 and $608, respectively) (h)	299,499			299,392			4.25	%	1.2
3.70% Medium-Term Notes due October 2020 (net of discounts of $28 and $30, respectively) (h)	299,972			299,970			3.70	%	3.5
2.34% Term Loan Facility due January 2021 (d) (h)	315,000			315,000			2.34	%	3.8
4.63% Medium-Term Notes due January 2022 (net of discounts of $1,715 and $1,805 respectively) (h)	398,285			398,195			4.63	%	4.8
3.75% Medium-Term Notes due July 2024 (net of discounts of $756 and $782, respectively) (h)	299,244			299,218			3.75	%	7.3
8.50% Debentures due September 2024	15,644			15,644			8.50	%	7.5
4.00% Medium-Term Notes due October 2025 (net of discounts of $585 and $602, respectively) (g) (h)	299,415			299,398			4.00	%	8.5
2.95% Medium-Term Notes due September 2026 (h)	300,000			300,000			2.95	%	9.4
Other	21			21
Deferred financing costs	(12,435		)	(12,568		)
Total Unsecured Debt, net	2,505,785			2,270,620			3.52	%	4.9
Total Debt, net	$	3,537,292		$	3,401,478		3.67	%	4.6

Secured credit facilities

Further information related to these credit facilities is as follows (dollars in thousands):

	March 31, 2017			December 31, 2016
Borrowings outstanding	$	538,442		$	636,782
Weighted average borrowings during the period ended	604,002			737,802
Maximum daily borrowings during the period ended	636,782			813,544
Weighted average interest rate during the period ended	3.9		%	3.9		%
Weighted average interest rate at the end of the period	4.0		%	3.8		%

Schedule of Maturities of Long-term Debt [Table Text Block]

The aggregate maturities, including amortizing principal payments of unsecured and secured debt, of total debt for the next ten calendar years subsequent to March 31, 2017 are as follows (dollars in thousands):

Year	Total Fixed Secured Debt		Total Variable Secured Debt			Total Secured Debt		Total Unsecured Debt			Total Debt
2017	$	3,310	$	46,568		$	49,878	$	220,000		$	269,878
2018	74,637		136,038			210,675		300,000			510,675
2019	249,395		67,700			317,095		36,140			353,235
2020	198,076		—			198,076		300,000			498,076
2021	1,117		—			1,117		350,000			351,117
2022	1,157		—			1,157		400,000			401,157
2023	41,245		—			41,245		—			41,245
2024	—		—			—		315,644			315,644
2025	127,600		—			127,600		300,000			427,600
2026	50,000		—			50,000		300,000			350,000
Thereafter	—		27,000			27,000		—			27,000
Subtotal	746,537		277,306			1,023,843		2,521,784			3,545,627
Non-cash (a)	7,952		(288		)	7,664		(15,999		)	(8,335		)
Total	$	754,489	$	277,018		$	1,031,507	$	2,505,785		$	3,537,292

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Debt (UNITED DOMINION REALTY, L.P.) (Tables)

3 Months Ended

Mar. 31, 2017

Entity Information [Line Items]

Secured debt instruments

The following is a summary of our secured and unsecured debt at March 31, 2017 and December 31, 2016 (dollars in thousands):

							Three Months Ended
	Principal Outstanding						March 31, 2017
	March 31, 2017			December 31, 2016			Weighted Average Interest Rate		Weighted Average Years to Maturity	Number of Communities Encumbered
Secured Debt:
Fixed Rate Debt
Mortgage notes payable (a)	$	401,135		$	402,996		4.04	%	6.1	7
Fannie Mae credit facilities (b)	355,836			355,836			5.06	%	2.6	10
Deferred financing costs	(2,482		)	(2,681		)
Total fixed rate secured debt, net	754,489			756,151			4.53	%	4.4	17
Variable Rate Debt
Tax-exempt secured notes payable (c)	94,700			94,700			1.42	%	5.9	2
Fannie Mae credit facilities (b)	182,606			280,946			2.05	%	1.3	5
Deferred financing costs	(288		)	(939		)
Total variable rate secured debt, net	277,018			374,707			1.84	%	2.9	7
Total Secured Debt, net	1,031,507			1,130,858			3.80	%	4.0	24
Unsecured Debt:
Variable Rate Debt
Borrowings outstanding under unsecured credit facility due January 2020 (d) (h)	—			—			—	%	2.8
Borrowings outstanding under unsecured commercial paper program due April 2017 (e) (h)	220,000			—			1.24	%	0.0
Borrowings outstanding under unsecured working capital credit facility due January 2019 (f)	36,140			21,350			1.88	%	1.8
Term Loan Facility due January 2021 (d) (h)	35,000			35,000			1.73	%	3.8
Fixed Rate Debt
4.25% Medium-Term Notes due June 2018 (net of discounts of $501 and $608, respectively) (h)	299,499			299,392			4.25	%	1.2
3.70% Medium-Term Notes due October 2020 (net of discounts of $28 and $30, respectively) (h)	299,972			299,970			3.70	%	3.5
2.34% Term Loan Facility due January 2021 (d) (h)	315,000			315,000			2.34	%	3.8
4.63% Medium-Term Notes due January 2022 (net of discounts of $1,715 and $1,805 respectively) (h)	398,285			398,195			4.63	%	4.8
3.75% Medium-Term Notes due July 2024 (net of discounts of $756 and $782, respectively) (h)	299,244			299,218			3.75	%	7.3
8.50% Debentures due September 2024	15,644			15,644			8.50	%	7.5
4.00% Medium-Term Notes due October 2025 (net of discounts of $585 and $602, respectively) (g) (h)	299,415			299,398			4.00	%	8.5
2.95% Medium-Term Notes due September 2026 (h)	300,000			300,000			2.95	%	9.4
Other	21			21
Deferred financing costs	(12,435		)	(12,568		)
Total Unsecured Debt, net	2,505,785			2,270,620			3.52	%	4.9
Total Debt, net	$	3,537,292		$	3,401,478		3.67	%	4.6

Secured credit facilities

Further information related to these credit facilities is as follows (dollars in thousands):

	March 31, 2017			December 31, 2016
Borrowings outstanding	$	538,442		$	636,782
Weighted average borrowings during the period ended	604,002			737,802
Maximum daily borrowings during the period ended	636,782			813,544
Weighted average interest rate during the period ended	3.9		%	3.9		%
Weighted average interest rate at the end of the period	4.0		%	3.8		%

Aggregate maturities of secured debt

The aggregate maturities, including amortizing principal payments of unsecured and secured debt, of total debt for the next ten calendar years subsequent to March 31, 2017 are as follows (dollars in thousands):

Year	Total Fixed Secured Debt		Total Variable Secured Debt			Total Secured Debt		Total Unsecured Debt			Total Debt
2017	$	3,310	$	46,568		$	49,878	$	220,000		$	269,878
2018	74,637		136,038			210,675		300,000			510,675
2019	249,395		67,700			317,095		36,140			353,235
2020	198,076		—			198,076		300,000			498,076
2021	1,117		—			1,117		350,000			351,117
2022	1,157		—			1,157		400,000			401,157
2023	41,245		—			41,245		—			41,245
2024	—		—			—		315,644			315,644
2025	127,600		—			127,600		300,000			427,600
2026	50,000		—			50,000		300,000			350,000
Thereafter	—		27,000			27,000		—			27,000
Subtotal	746,537		277,306			1,023,843		2,521,784			3,545,627
Non-cash (a)	7,952		(288		)	7,664		(15,999		)	(8,335		)
Total	$	754,489	$	277,018		$	1,031,507	$	2,505,785		$	3,537,292

United Dominion Reality L.P. [Member]

Entity Information [Line Items]

Secured debt instruments

Secured debt consists of the following as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	Principal Outstanding						For the Three Months Ended March 31, 2017
	March 31, 2017			December 31, 2016			Weighted Average Interest Rate		Weighted Average Years to Maturity	Number of Communities Encumbered
Fixed Rate Debt
Fannie Mae credit facilities	$	228,870		$	244,912		5.07	%	2.6	6
Deferred financing costs	(718		)	(1,070		)
Total fixed rate secured debt, net	228,152			243,842			5.07	%	2.6	6
Variable Rate Debt
Tax-exempt secured note payable	27,000			27,000			1.39	%	15.0	1
Fannie Mae credit facilities	81,339			163,637			2.34	%	1.7	2
Deferred financing costs	(251		)	(505		)
Total variable rate secured debt, net	108,088			190,132			2.10	%	5.0	3
Total Secured Debt, net	$	336,240		$	433,974		4.26	%	3.4	9

Secured credit facilities

The following information relates to the credit facilities owed by the Operating Partnership (dollars in thousands):

	March 31, 2017			December 31, 2016
Borrowings outstanding	$	310,209		$	408,549
Weighted average borrowings during the period ended	375,770			414,759
Maximum daily borrowings during the period ended	408,549			421,001
Weighted average interest rate during the period ended	4.1		%	3.9		%
Interest rate at the end of the period	4.4		%	4.0		%

Aggregate maturities of secured debt

The aggregate maturities of the Operating Partnership’s secured debt due during each of the next ten calendar years subsequent to March 31, 2017 are as follows (dollars in thousands):

	Fixed			Variable
Year	Secured Credit Facilities			Tax-Exempt Secured Notes Payable			Secured Credit Facilities			Total
2017	$	—		$	—		$	—		$	—
2018	41,854			—			81,339			123,193
2019	133,204			—			—			133,204
2020	53,812			—			—			53,812
2021	—			—			—			—
2022	—			—			—			—
2023	—			—			—			—
2024	—			—			—			—
2025	—			—			—			—
2026	—			—			—			—
Thereafter	—			27,000			—			27,000
Subtotal	228,870			27,000			81,339			337,209
Non-cash (a)	(718		)	(84		)	(167		)	(969		)
Total	$	228,152		$	26,916		$	81,172		$	336,240

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Income/(Loss) Per Share (Tables)

3 Months Ended

Mar. 31, 2017

Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following table sets forth the additional shares of common stock outstanding by equity instrument if converted to common stock for each of the three months endedMarch 31, 2017 and 2016(shares in thousands):

	Three Months Ended
	March 31,
	2017	2016
OP/DownREIT Units	24,962	25,191
Convertible preferred stock	3,028	3,028
Stock options, unvested LTIP Units and unvested restricted stock	1,898	1,829

(Loss)/earnings per share

The following table sets forth the computation of basic and diluted income/(loss) per share for the periods presented (dollars and shares in thousands, except per share data):

	Three Months Ended
	March 31,
	2017			2016
Numerator for income/(loss) per share:
Income/(loss) from continuing operations	$	26,264		$	8,534
Gain/(loss) on sale of real estate owned, net of tax	2,132			3,070
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(2,338		)	(905		)
Net (income)/loss attributable to noncontrolling interests	(91		)	(306		)
Net income/(loss) attributable to UDR, Inc.	25,967			10,393
Distributions to preferred stockholders — Series E (Convertible)	(929		)	(929		)
Income/(loss) attributable to common stockholders - basic and diluted	$	25,038		$	9,464
Denominator for income/(loss) per share:
Weighted average common shares outstanding	267,402			263,355
Non-vested restricted stock awards	(612		)	(899		)
Denominator for basic income/(loss) per share	266,790			262,456
Incremental shares issuable from assumed conversion of stock options, unvested LTIP Units and unvested restricted stock	1,898			1,829
Denominator for diluted income/(loss) per share	268,688			264,285
Income/(loss) per weighted average common share:
Basic	$	0.09		$	0.04
Diluted	$	0.09		$	0.04

XML

Noncontrolling Interests (Tables)

3 Months Ended

Mar. 31, 2017

Noncontrolling Interest [Abstract]

Redeemable noncontrolling interests in the Operating Partnership

The following table sets forth redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership for the following period (dollars in thousands):

Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership, December 31, 2016	$	909,482
Mark-to-market adjustment to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	281
Conversion of OP Units/DownREIT Units to Common Stock	(1,850		)
Net income/(loss) attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	2,338
Distributions to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(7,919		)
Vesting of Long-Term Incentive Plan Units	2,317
Allocation of other comprehensive income/(loss)	129
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership, March 31, 2017	$	904,778

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Fair Value of Derivatives and Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Estimated fair values

The estimated fair values of the Company’s financial instruments either recorded or disclosed on a recurring basis as of March 31, 2017 and December 31, 2016 are summarized as follows (dollars in thousands):

					Fair Value at March 31, 2017, Using
	Total Carrying Amount in Statement of Financial Position at March 31, 2017		Fair Value Estimate at March 31, 2017		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Description:
Notes receivable (a)	$	19,790	$	19,735	$	—	$	—	$	19,735
Derivatives - Interest rate contracts (b)	5,067		5,067		—		5,067		—
Total assets	$	24,857	$	24,802	$	—	$	5,067	$	19,735
Derivatives - Interest rate contracts (b)	$	9	$	9	$	—	$	9	$	—
Secured debt instruments - fixed rate: (c)
Mortgage notes payable	401,135		395,504		—		—		395,504
Fannie Mae credit facilities	355,836		365,391		—		—		365,391
Secured debt instruments - variable rate: (c)
Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
Fannie Mae credit facilities	182,606		182,606		—		—		182,606
Unsecured debt instruments: (c)
Working capital credit facility	36,140		36,140		—		—		36,140
Commercial paper program	220,000		220,000		—		—		220,000
Unsecured notes	2,262,059		2,302,863		—		—		2,302,863
Total liabilities	$	3,552,485	$	3,597,213	$	—	$	9	$	3,597,204
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (d)	$	904,778	$	904,778	$	—	$	904,778	$	—

					Fair Value at December 31, 2016, Using
	Total Carrying Amount in Statement of Financial Position at December 31, 2016		Fair Value Estimate at December 31, 2016		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Description:
Notes receivable (a)	$	19,790	$	19,645	$	—	$	—	$	19,645
Derivatives - Interest rate contracts (b)	4,360		4,360		—		4,360		—
Total assets	$	24,150	$	24,005	$	—	$	4,360	$	19,645
Derivatives- Interest rate contracts (b)	$	413	$	413	$	—	$	413	$	—
Secured debt instruments - fixed rate: (c)
Mortgage notes payable	402,996		396,045		—		—		396,045
Fannie Mae credit facilities	355,836		365,693		—		—		365,693
Secured debt instruments - variable rate: (c)
Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
Fannie Mae credit facilities	280,946		280,946		—		—		280,946
Unsecured debt instruments: (c)
Working capital credit facility	21,350		21,350		—		—		21,350
Unsecured notes	2,261,838		2,304,492		—		—		2,304,492
Total liabilities	$	3,418,079	$	3,463,639	$	—	$	413	$	3,463,226
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (d)	$	909,482	$	909,482	$	—	$	909,482	$	—

(a)See Note 2, Significant Accounting Policies.

(b)See Note 10, Derivatives and Hedging Activity.

(c)See Note 6, Secured Debt and Unsecured Debt, Net.

(d)See Note 8, Noncontrolling Interests.

XML

Fair Value of Derivatives and Financial Instruments (UNITED DOMINION REALTY, L.P.) (Tables)

3 Months Ended

Mar. 31, 2017

Entity Information [Line Items]

Estimated fair values

The estimated fair values of the Company’s financial instruments either recorded or disclosed on a recurring basis as of March 31, 2017 and December 31, 2016 are summarized as follows (dollars in thousands):

					Fair Value at March 31, 2017, Using
	Total Carrying Amount in Statement of Financial Position at March 31, 2017		Fair Value Estimate at March 31, 2017		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Description:
Notes receivable (a)	$	19,790	$	19,735	$	—	$	—	$	19,735
Derivatives - Interest rate contracts (b)	5,067		5,067		—		5,067		—
Total assets	$	24,857	$	24,802	$	—	$	5,067	$	19,735
Derivatives - Interest rate contracts (b)	$	9	$	9	$	—	$	9	$	—
Secured debt instruments - fixed rate: (c)
Mortgage notes payable	401,135		395,504		—		—		395,504
Fannie Mae credit facilities	355,836		365,391		—		—		365,391
Secured debt instruments - variable rate: (c)
Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
Fannie Mae credit facilities	182,606		182,606		—		—		182,606
Unsecured debt instruments: (c)
Working capital credit facility	36,140		36,140		—		—		36,140
Commercial paper program	220,000		220,000		—		—		220,000
Unsecured notes	2,262,059		2,302,863		—		—		2,302,863
Total liabilities	$	3,552,485	$	3,597,213	$	—	$	9	$	3,597,204
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (d)	$	904,778	$	904,778	$	—	$	904,778	$	—

					Fair Value at December 31, 2016, Using
	Total Carrying Amount in Statement of Financial Position at December 31, 2016		Fair Value Estimate at December 31, 2016		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Description:
Notes receivable (a)	$	19,790	$	19,645	$	—	$	—	$	19,645
Derivatives - Interest rate contracts (b)	4,360		4,360		—		4,360		—
Total assets	$	24,150	$	24,005	$	—	$	4,360	$	19,645
Derivatives- Interest rate contracts (b)	$	413	$	413	$	—	$	413	$	—
Secured debt instruments - fixed rate: (c)
Mortgage notes payable	402,996		396,045		—		—		396,045
Fannie Mae credit facilities	355,836		365,693		—		—		365,693
Secured debt instruments - variable rate: (c)
Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
Fannie Mae credit facilities	280,946		280,946		—		—		280,946
Unsecured debt instruments: (c)
Working capital credit facility	21,350		21,350		—		—		21,350
Unsecured notes	2,261,838		2,304,492		—		—		2,304,492
Total liabilities	$	3,418,079	$	3,463,639	$	—	$	413	$	3,463,226
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (d)	$	909,482	$	909,482	$	—	$	909,482	$	—

(a)See Note 2, Significant Accounting Policies.

(b)See Note 10, Derivatives and Hedging Activity.

(c)See Note 6, Secured Debt and Unsecured Debt, Net.

(d)See Note 8, Noncontrolling Interests.

United Dominion Reality L.P. [Member]

Entity Information [Line Items]

Estimated fair values

The estimated fair values of the Operating Partnership’s financial instruments either recorded or disclosed on a recurring basis as of March 31, 2017 and December 31, 2016 are summarized as follows (dollars in thousands):

					Fair Value at March 31, 2017, Using
	Total Carrying Amount in Statement of Financial Position at March 31, 2017		Fair Value Estimate at March 31, 2017		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Description:
Secured debt instruments - fixed rate: (a)
Fannie Mae credit facilities	$	228,870	$	235,159	$	—	$	—	$	235,159
Secured debt instruments - variable rate: (a)
Tax-exempt secured notes payable	27,000		27,000		—		—		27,000
Fannie Mae credit facilities	81,339		81,339		—		—		81,339
Total liabilities	$	337,209	$	343,498	$	—	$	—	$	343,498

					Fair Value at December 31, 2016, Using
	Total Carrying Amount in Statement of Financial Position at December 31, 2016		Fair Value Estimate at December 31, 2016		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Description:
Derivatives - Interest rate contracts (b)	$	1	$	1	$	—	$	1	$	—
Total assets	$	1	$	1	$	—	$	1	$	—
Secured debt instruments - fixed rate: (a)
Fannie Mae credit facilities	$	244,912	$	251,664	$	—	$	—	$	251,664
Secured debt instruments - variable rate: (a)
Tax-exempt secured notes payable	27,000		27,000		—		—		27,000
Fannie Mae credit facilities	163,637		163,637		—		—		163,637
Total liabilities	$	435,549	$	442,301	$	—	$	—	$	442,301

(a)See Note 5, Debt, Net.

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Derivatives and Hedging Activity (Tables)

3 Months Ended

Mar. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Outstanding interest rate derivatives

As of March 31, 2017, the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate swaps (a)	4	$	315,000
Interest rate caps	2	$	203,166

(a) Of the four interest rate swaps noted in the table above, two swaps with an aggregate notional value of $215.0 million mature in April 2017 and two swaps with an aggregate notional value of $100.0 million mature in January 2020. The Company has entered into two forward starting interest rate swaps with an aggregate notional value of $215.0 million and a maturity in January 2020, which are effective upon the expiration of the swaps maturing in April 2017.

Derivatives not designated as hedges are not speculative and are used to manage the Company’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in a loss of less than $0.1 million for the three months endedMarch 31, 2017 and 2016.

As of March 31, 2017, the Company had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate caps	3	$	133,107

Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet

The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	Asset Derivatives (included in Other assets)				Liability Derivatives (included in Other liabilities)
	Fair Value at:				Fair Value at:
	March 31, 2017		December 31, 2016		March 31, 2017		December 31, 2016
Derivatives designated as hedging instruments:
Interest rate products	$	5,067	$	4,359	$	9	$	413
Derivatives not designated as hedging instruments:
Interest rate products	$	—	$	1	$	—	$	—

Effect of Company's derivative financial instruments on Consolidated Statements of Operation

The tables below present the effect of the Company’s derivative financial instruments on the Consolidated Statements of Operations for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

Derivatives in Cash Flow Hedging Relationships	Unrealized holding gain/(loss) Recognized in OCI (Effective Portion)					Gain/(Loss) Reclassified from Accumulated OCI into Interest expense (Effective Portion)						Gain/(Loss) Recognized in Interest expense (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	2017		2016			2017			2016			2017			2016
Three Months Ended March 31,
Interest rate products	$	632	$	(811	)	$	(764	)	$	(935	)	$	(54	)	$	—

Effect of Company's derivatives not designated as hedging instruments on the Consolidated Statements of Operations

	Gain/(Loss) Recognized in Interest income and other income/(expense), net
Derivatives Not Designated as Hedging Instruments	2017			2016
Three Months Ended March 31,
Interest rate products	$	(1	)	$	—

Offsetting Assets [Table Text Block]

Offsetting of Derivative Assets
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Financial Instruments			Cash Collateral Received		Net Amount
March 31, 2017	$	5,067	$	—	$	5,067	$	(5	)	$	—	$	5,062
December 31, 2016	$	4,360	$	—	$	4,360	$	(221	)	$	—	$	4,139

(a) Amounts reconcile to the aggregate fair value of derivative assets in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

Offsetting Liabilities [Table Text Block]

Offsetting of Derivative Liabilities
	Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (a)		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Financial Instruments			Cash Collateral Posted		Net Amount
March 31, 2017	$	9	$	—	$	9	$	(5	)	$	—	$	4
December 31, 2016	$	413	$	—	$	413	$	(221	)	$	—	$	192

(a) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

XML

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Tables)

3 Months Ended

Mar. 31, 2017

Entity Information [Line Items]

Outstanding interest rate derivatives

As of March 31, 2017, the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate swaps (a)	4	$	315,000
Interest rate caps	2	$	203,166

(a) Of the four interest rate swaps noted in the table above, two swaps with an aggregate notional value of $215.0 million mature in April 2017 and two swaps with an aggregate notional value of $100.0 million mature in January 2020. The Company has entered into two forward starting interest rate swaps with an aggregate notional value of $215.0 million and a maturity in January 2020, which are effective upon the expiration of the swaps maturing in April 2017.

Derivatives not designated as hedges are not speculative and are used to manage the Company’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in a loss of less than $0.1 million for the three months endedMarch 31, 2017 and 2016.

As of March 31, 2017, the Company had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate caps	3	$	133,107

Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet

The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	Asset Derivatives (included in Other assets)				Liability Derivatives (included in Other liabilities)
	Fair Value at:				Fair Value at:
	March 31, 2017		December 31, 2016		March 31, 2017		December 31, 2016
Derivatives designated as hedging instruments:
Interest rate products	$	5,067	$	4,359	$	9	$	413
Derivatives not designated as hedging instruments:
Interest rate products	$	—	$	1	$	—	$	—

Effect of Company's derivative financial instruments on Consolidated Statements of Operation

The tables below present the effect of the Company’s derivative financial instruments on the Consolidated Statements of Operations for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

Derivatives in Cash Flow Hedging Relationships	Unrealized holding gain/(loss) Recognized in OCI (Effective Portion)					Gain/(Loss) Reclassified from Accumulated OCI into Interest expense (Effective Portion)						Gain/(Loss) Recognized in Interest expense (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	2017		2016			2017			2016			2017			2016
Three Months Ended March 31,
Interest rate products	$	632	$	(811	)	$	(764	)	$	(935	)	$	(54	)	$	—

Effect of Company's derivatives not designated as hedging instruments on the Consolidated Statements of Operations

	Gain/(Loss) Recognized in Interest income and other income/(expense), net
Derivatives Not Designated as Hedging Instruments	2017			2016
Three Months Ended March 31,
Interest rate products	$	(1	)	$	—

Offsetting Assets [Table Text Block]

Offsetting of Derivative Assets
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Financial Instruments			Cash Collateral Received		Net Amount
March 31, 2017	$	5,067	$	—	$	5,067	$	(5	)	$	—	$	5,062
December 31, 2016	$	4,360	$	—	$	4,360	$	(221	)	$	—	$	4,139

(a) Amounts reconcile to the aggregate fair value of derivative assets in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

Offsetting Liabilities [Table Text Block]

Offsetting of Derivative Liabilities
	Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (a)		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Financial Instruments			Cash Collateral Posted		Net Amount
March 31, 2017	$	9	$	—	$	9	$	(5	)	$	—	$	4
December 31, 2016	$	413	$	—	$	413	$	(221	)	$	—	$	192

(a) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

United Dominion Reality L.P. [Member]

Entity Information [Line Items]

Outstanding interest rate derivatives

As of March 31, 2017, the Operating Partnership had the following outstanding interest rate derivatives designated as cash flow hedges of interest rate risk (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate caps	1	$	82,494

Derivatives not designated as hedges are not speculative and are used to manage the Operating Partnership’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in an adjustment to earnings of less than $0.1 million for the three months endedMarch 31, 2017 and 2016.

As of March 31, 2017, we had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate caps	3	$	87,580

As of March 31, 2017, the Operating Partnership had the following outstanding interest rate derivatives designated as cash flow hedges of interest rate risk (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate caps	1	$	82,494

Derivatives not designated as hedges are not speculative and are used to manage the Operating Partnership’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in an adjustment to earnings of less than $0.1 million for the three months endedMarch 31, 2017 and 2016.

As of March 31, 2017, we had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships (dollars in thousands):

Product	Number of Instruments	Notional
Interest rate caps	3	$	87,580

Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet

The table below presents the fair value of the Operating Partnership’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of March 31, 2017 and December 31, 2016 (dollars in thousands):

	Asset Derivatives (included in Other assets)				Liability Derivatives (included in Other liabilities)
	Fair Value at:				Fair Value at:
	March 31, 2017		December 31, 2016		March 31, 2017		December 31, 2016
Derivatives designated as hedging instruments:
Interest rate products	$	—	$	—	$	—	$	—
Derivatives not designated as hedging instruments:
Interest rate products	$	—	$	1	$	—	$	—

Effect of Company's derivative financial instruments on Consolidated Statements of Operation

The tables below present the effect of the derivative financial instruments on the Consolidated Statements of Operations for the three months endedMarch 31, 2017 and 2016 (dollars in thousands):

	Unrealized holding gain/(loss) Recognized in OCI (Effective Portion)					Gain/(Loss) Reclassified from Accumulated OCI into Interest expense (Effective Portion)					Gain/(Loss) Recognized in Interest expense (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Derivatives in Cash Flow Hedging Relationships	2017		2016			2017		2016			2017			2016
Three Months Ended March 31,
Interest rate products	$	—	$	(2	)	$	—	$	(1	)	$	(54	)	$	—

Effect of Company's derivatives not designated as hedging instruments on the Consolidated Statements of Operations

	Gain/(Loss) Recognized in Interest income and other income/(expense), net
Derivatives Not Designated as Hedging Instruments	2017			2016
Three Months Ended March 31,
Interest rate products	$	(1	)	$	—

Offsetting Assets [Table Text Block]

The General Partner has elected not to offset derivative positions in the consolidated financial statements. The table below presents the effect on the Operating Partnership’s financial position had the General Partner made the election to offset its derivative positions as of March 31, 2017 and December 31, 2016:

Offsetting of Derivative Assets
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheets		Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)		Gross Amounts Not Offset in the Consolidated Balance Sheets
							Financial Instruments		Cash Collateral Received		Net Amount
March 31, 2017	$	—	$	—	$	—	$	—	$	—	$	—
December 31, 2016	$	1	$	—	$	1	$	—	$	—	$	1

(a) Amounts reconcile to the aggregate fair value of derivative assets in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

Offsetting Liabilities [Table Text Block]

Offsetting of Derivative Liabilities

Gross Amounts of Recognized Liabilities

Gross Amounts Offset in the Consolidated Balance Sheets

Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (a)

Gross Amounts Not Offset in the Consolidated Balance Sheets

Financial Instruments

Cash Collateral Posted

Net Amount

March 31, 2017

$

—

$

—

$

—

$

—

$

—

$

—

December 31, 2016

$

—

$

—

$

—

$

—

$

—

$

—

(a) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

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Capital Structure (UNITED DOMINION REALTY, L.P.) Capital Structure (UNITED DOMINION REALTY, L.P.) (Tables)

3 Months Ended

Mar. 31, 2017

United Dominion Reality L.P. [Member]

Limited Partners' Capital Account [Line Items]

Schedule of Limited Partners' Capital Account by Class [Table Text Block]

The following table shows OP Units outstanding and OP Unit activity as of and for the three months ended March 31, 2017:

	Class A Limited Partners			UDR, Inc.
		Limited Partners		Limited Partner	Class A Limited Partner	General Partner	Total
Ending balance at December 31, 2016	1,751,671	7,296,943		173,997,540	121,661	110,883	183,278,698
Vesting of LTIP Units	—	72,226		—		—	72,226
OP redemptions for UDR stock	—	(3,607	)	3,607	—	—	—
Ending balance at March 31, 2017	1,751,671	7,365,562		174,001,147	121,661	110,883	183,350,924

XML

Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Real estate commitments

The following summarizes the Company’s real estate commitments at March 31, 2017 (dollars in thousands):

	Number of Properties	Costs Incurred to Date (a)			Expected Costs to Complete			Average Ownership Stake
Wholly-owned — under development	2	$	393,837	(b)	$	314,663		100	%
Wholly-owned — redevelopment	1	3,699		(b)	5,801			100	%
Joint ventures:
Unconsolidated joint ventures	6	721,462			66,525		(c)	50	%
Participating loan investments	1	94,002		(d)	—		(e)	0	%
Preferred equity investments	2	42,013		(f)	—			49	%
Total		$	1,255,013		$	386,989

(a) Represents 100% of project costs incurred as of March 31, 2017.

(b) Costs incurred as of March 31, 2017 include $25.3 million and $0.7 million of accruedfixed assets for development and redevelopment, respectively.

(c) Represents UDR’s proportionate share of expected remaining costs to complete the developments.

(d) Represents the participating loan balance funded as of March 31, 2017.

(e) Represents UDR's remaining participating loan commitment for Steele Creek.

(f) Represents UDR's investment in the West Coast Development Joint Ventures for the properties under development as of March 31, 2017.

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Reportable Segment (Tables)

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations

The following table details rental income and NOI for UDR’s reportable segments for the three months endedMarch 31, 2017 and 2016, and reconciles NOI to Net Income/(Loss) Attributable to UDR, Inc. in the Consolidated Statements of Operations (dollars in thousands):

	Three Months Ended
	March 31, (a)
	2017			2016
Reportable apartment home segment rental income
Same-Store Communities
West Region	$	82,220		$	78,409
Mid-Atlantic Region	52,109			50,154
Northeast Region	37,921			36,460
Southeast Region	28,657			27,137
Southwest Region	10,679			10,125
Non-Mature Communities/Other	29,685			29,672
Total segment and consolidated rental income	$	241,271		$	231,957
Reportable apartment home segment NOI
Same-Store Communities
West Region	$	61,895		$	59,146
Mid-Atlantic Region	36,315			33,729
Northeast Region	26,901			26,360
Southeast Region	19,661			18,797
Southwest Region	6,678			6,331
Non-Mature Communities/Other	20,033			19,771
Total segment and consolidated NOI	171,483			164,134
Reconciling items:
Joint venture management and other fees	2,570			2,858
Property management	(6,635		)	(6,379		)
Other operating expenses	(1,691		)	(1,752		)
Real estate depreciation and amortization	(105,032		)	(105,339		)
General and administrative	(13,075		)	(13,844		)
Casualty-related (charges)/recoveries, net	(502		)	—
Other depreciation and amortization	(1,608		)	(1,553		)
Income/(loss) from unconsolidated entities	11,198			679
Interest expense	(30,539		)	(31,104		)
Interest income and other income/(expense), net	427			431
Tax (provision)/benefit, net	(332		)	403
Gain/(loss) on sale of real estate owned, net of tax	2,132			3,070
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(2,338		)	(905		)
Net (income)/loss attributable to noncontrolling interests	(91		)	(306		)
Net income/(loss) attributable to UDR, Inc.	$	25,967		$	10,393

(a) Same-Store Community population consisted of 35,689 apartment homes.

Details of assets of UDR's reportable segments

The following table details the assets of UDR’s reportable segments as of March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Reportable apartment home segment assets:
Same-Store Communities:
West Region	$	2,944,437		$	2,938,073
Mid-Atlantic Region	2,221,312			2,216,067
Northeast Region	1,858,432			1,857,193
Southeast Region	750,147			746,762
Southwest Region	283,979			283,260
Non-Mature Communities/Other	1,729,262			1,574,398
Total segment assets	9,787,569			9,615,753
Accumulated depreciation	(3,026,660		)	(2,923,625		)
Total segment assets — net book value	6,760,909			6,692,128
Reconciling items:
Cash and cash equivalents	2,460			2,112
Restricted cash	19,757			19,994
Notes receivable, net	19,790			19,790
Investment in and advances to unconsolidated joint ventures, net	818,990			827,025
Other assets	114,005			118,535
Total consolidated assets	$	7,735,911		$	7,679,584

XML

Reportable Segments (UNITED DOMINION REALTY, L.P.) (Tables)

3 Months Ended

Mar. 31, 2017

United Dominion Reality L.P. [Member]

Entity Information [Line Items]

Reportable segments information

The following table details rental income and NOI for the Operating Partnership’s reportable segments for the three months endedMarch 31, 2017 and 2016, and reconciles NOI to Net income/(loss) attributable to OP unitholders in the Consolidated Statements of Operations (dollars in thousands):

	Three Months Ended
	March 31, (a)
	2017			2016
Reportable apartment home segment rental income
Same-Store Communities
West Region	$	50,482		$	47,636
Mid-Atlantic Region	14,748			14,167
Northeast Region	13,559			13,006
Southeast Region	12,271			11,696
Non-Mature Communities/Other	11,545			12,281
Total segment and consolidated rental income	$	102,605		$	98,786
Reportable apartment home segment NOI
Same-Store Communities
West Region	$	38,445		$	36,159
Mid-Atlantic Region	10,095			9,362
Northeast Region	10,131			10,057
Southeast Region	8,283			8,043
Non-Mature Communities/Other	8,109			8,931
Total segment and consolidated NOI	75,063			72,552
Reconciling items:
Property management	(2,822		)	(2,717		)
Other operating expenses	(1,548		)	(1,500		)
Real estate depreciation and amortization	(36,879		)	(36,791		)
General and administrative	(5,219		)	(5,421		)
Casualty-related recoveries/(charges), net	(553		)	—
Income/(loss) from unconsolidated entities	(5,424		)	(13,387		)
Interest expense	(8,611		)	(7,605		)
Net (income)/loss attributable to noncontrolling interests	(350		)	(344		)
Net income/(loss) attributable to OP unitholders	$	13,657		$	4,787

(a)Same-Store Community population consisted of 15,058 apartment homes.

The following table details the assets of the Operating Partnership’s reportable segments as of March 31, 2017 and December 31, 2016(dollars in thousands):

	March 31, 2017			December 31, 2016
Reportable apartment home segment assets
Same-Store Communities
West Region	$	1,601,136		$	1,596,815
Mid-Atlantic Region	656,850			655,693
Northeast Region	675,407			674,928
Southeast Region	330,214			328,729
Non-Mature Communities/Other	422,727			418,539
Total segment assets	3,686,334			3,674,704
Accumulated depreciation	(1,445,528		)	(1,408,815		)
Total segment assets - net book value	2,240,806			2,265,889
Reconciling items:
Cash and cash equivalents	864			756
Restricted cash	12,141			11,694
Investment in unconsolidated entities	103,267			112,867
Other assets	21,475			24,329
Total consolidated assets	$	2,378,553		$	2,415,535

XML

Consolidation and Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Other Interest and Dividend Income	$ 0.5	$ 0.4
Limited partnership units owned	183,350,924		183,278,698
Deferred Tax Assets, Net	$ 0.4		$ 0.6
UDR Lighthouse DownREIT L.P. [Member]
Operating Partnership outstanding units	32,367,380
United Dominion Reality L.P. [Member] | UDR Lighthouse DownREIT L.P. [Member]
Operating Partnership outstanding units	13,470,651
Percentage of units outstanding in Heritage OP	41.60%
Limited Partner [Member] | UDR Lighthouse DownREIT L.P. [Member]
Operating Partnership outstanding units	15,835,284
Percentage of units outstanding in Heritage OP	48.92359%
General Partner [Member] | UDR Lighthouse DownREIT L.P. [Member]
Operating Partnership outstanding units	16,532,096
General Partners Capital Account Units Owned Percentage	51.07641%
Non-affiliated Partners [Member]
Limited partnership units owned	7,365,562		7,296,943

XML

Consolidation and Basis of Presentation (UNITED DOMINION REALTY, L.P.) (Details)	3 Months Ended
	Mar. 31, 2017 Communities Apartment_Homes Markets shares	Mar. 31, 2016	Dec. 31, 2016 shares
Entity Information [Line Items]
Number of Real Estate Properties | Communities	128
Number of apartments owned (in apartments homes) | Apartment_Homes	39,698
OP units outstanding related to limited partner	183,350,924		183,278,698
United Dominion Reality L.P. [Member]
Entity Information [Line Items]
Rental revenues percent of General Partner's consolidated rental revenues	43.00%	42.60%
Number of Real Estate Properties | Communities	54
Number of markets operating within (in markets) | Markets	14
Number of apartments owned (in apartments homes) | Apartment_Homes	16,698
Operating Partnership outstanding units	183,350,924
OP units outstanding related to general partner	110,883		110,883
OP units outstanding related to limited partner	183,240,041		183,167,815
Limited Partner [Member] | United Dominion Reality L.P. [Member]
Entity Information [Line Items]
OP units outstanding related to limited partner	174,233,691
Percentage of units outstanding in Heritage OP	95.00%
Non-affiliated Partners [Member]
Entity Information [Line Items]
OP units outstanding related to limited partner	7,365,562		7,296,943
Non-affiliated Partners [Member] | United Dominion Reality L.P. [Member]
Entity Information [Line Items]
OP units outstanding related to limited partner	9,117,233		9,048,614
Percentage of units outstanding in Heritage OP	5.00%		4.90%

XML

Significant Accounting Policies (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Accounting Policies [Line Items]
Return on investment in unconsolidated joint ventures	$ 1,455,000	$ 272,000
Distributions received from unconsolidated entities	(9,711,000)	(7,711,000)
Notes receivable, net	19,790,000		$ 19,790,000
Current Income Tax Expense (Benefit)	0
Deferred Tax Assets, Net	400,000		600,000
Significant Accounting Policies (Textual) [Abstract]
Note maturity public capital threshold	5,000,000
Note receivable interest income	$ 500,000	400,000
Recognition and evaluation of tax position, whether a tax position is more likely	not (greater than 50 percent probability)
Unrecognized tax benefit, accrued interest or penalties due to examination	$ 0
Interest Income, Related Party	$ 0
Note due February 2017 [Member]
Accounting Policies [Line Items]
Note Receivable Interest Rate	10.00%
Notes receivable, net			12,994,000
Significant Accounting Policies (Textual) [Abstract]
Notes receivable	$ 12,994,000
Note maturity public capital threshold	$ 5,000,000
Other [Member]
Accounting Policies [Line Items]
Note Receivable Interest Rate	8.00%
Notes receivable, net	$ 2,500,000		2,500,000
Significant Accounting Policies (Textual) [Abstract]
Notes receivable	$ 2,500,000
Note due October 2020 [Member]
Accounting Policies [Line Items]
Note Receivable Interest Rate	8.00%
Notes receivable, net	$ 1,296,000		1,296,000
Significant Accounting Policies (Textual) [Abstract]
Notes receivable	2,000,000
Note maturity public capital threshold	$ 10,000,000
Note Due April 2021 [Member]
Accounting Policies [Line Items]
Note Receivable Interest Rate	10.00%
Notes receivable, net	$ 3,000,000		3,000,000
Significant Accounting Policies (Textual) [Abstract]
Notes receivable	15,000,000
Note maturity public capital threshold	25,000,000
RedeemableNoncontrollingInterest [Member]
Accounting Policies [Line Items]
Comprehensive (loss)/income attributable to non-controlling interests	129,000	(500,000)
Accounting Standards Update 2016-09 [Member]
Accounting Policies [Line Items]
Cumulative effect upon adoption of ASU 2016-09	0
Accumulated Distributions in Excess of Net Income [Member] | Accounting Standards Update 2016-09 [Member]
Accounting Policies [Line Items]
Cumulative effect upon adoption of ASU 2016-09	(558,000)
Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Accounting Policies [Line Items]
Notes receivable, net	$ 19,790,000		$ 19,790,000
Scenario, Previously Reported [Member]
Accounting Policies [Line Items]
Return on investment in unconsolidated joint ventures		0
Distributions received from unconsolidated entities		(7,983,000)
Adjustments for New Accounting Principle, Early Adoption [Member]
Accounting Policies [Line Items]
Distributions received from unconsolidated entities		$ (272,000)

XML

Real Estate Owned (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Land	$ 1,812,797	$ 1,801,576
Land Improvements	180,837	178,701
Depreciable property - held and used:
Building, Improvements, and Furniture, Fixtures and Equipment	7,400,098	7,291,570
Under development:
Real estate under development (net of accumulated depreciation of $0 and $0, respectively)	393,837	342,282
Real estate owned	9,787,569	9,615,753
Real Estates Owned Accumulated Depreciation	3,026,660	2,923,625
Real Estate Investments, Net	6,760,909	6,692,128
Land [Member]
Under development:
Real estate under development (net of accumulated depreciation of $0 and $0, respectively)	111,028	111,028
Real Estate Held-for-sale	0	1,104
Construction in progress [Member]
Under development:
Real estate under development (net of accumulated depreciation of $0 and $0, respectively)	282,809	231,254
Building and Building Improvements [Member]
Under development:
Real Estate Held-for-sale	$ 0	$ 520

XML

Real Estate Owned (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Communities Apartment_Homes States	Mar. 31, 2016 USD ($)	Dec. 31, 2016
Real Estate Properties [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	$ 97,000
Number of Apartment Homes Acquired	155
Investment in unconsolidated joint ventures	$ 24,193	$ 13,262
Real Estate Owned (Textual) [Abstract]
Number of states in which there are owned and consolidated communities	10
Number of apartment homes owned and consolidated by the Company | Apartment_Homes	39,698
Number of Real Estate Properties | Communities	128
Development costs excluding direct costs and capitlized interest	$ 2,800	2,000
Interest capitalized during period	4,700	4,200
Other Cost and Expense, Operating	1,691	1,752
Proceeds from Sale of Property, Plant, and Equipment	3,500
Payments for (Proceeds from) Investments	3,300
Gain/(loss) on sale of real estate owned, net of tax	2,132	3,070
Casualty-related (recoveries)/charges, net	$ 502	0
CityLine [Member]
Real Estate Properties [Line Items]
Number of Apartment Homes Acquired	244
Investment in unconsolidated joint ventures	$ 66,000
United Dominion Reality L.P. [Member]
Real Estate Owned (Textual) [Abstract]
Number of states in which there are owned and consolidated communities | States	8
Number of apartment homes owned and consolidated by the Company | Apartment_Homes	16,698
Number of Real Estate Properties | Communities	54
Development costs excluding direct costs and capitlized interest	$ 300	300
Interest capitalized during period	100	100
Other Cost and Expense, Operating	1,548	1,500
Casualty-related (recoveries)/charges, net	$ 553	$ 0
Operating Community [Member] | Unconsolidated Joint Venture Vitruvian Park [Member]
Real Estate Properties [Line Items]
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Real Estate Owned (Textual) [Abstract]
Number of Real Estate Properties	3
Operating Community [Member] | Unconsolidated Joint Venture UDR MetLife II Partnership [Member]
Real Estate Properties [Line Items]
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Real Estate Owned (Textual) [Abstract]
Number of Real Estate Properties	18
Development Community [Member] | Unconsolidated Joint Venture Vitruvian Park [Member]
Real Estate Owned (Textual) [Abstract]
Number of Real Estate Properties	1
Land, Buildings and Improvements [Member] | Unconsolidated Joint Venture UDR MetLife II Partnership [Member]
Real Estate Properties [Line Items]
Property, Plant and Equipment, Additions	$ 12,200
Subsequent Investment [Member] | CityLine [Member]
Real Estate Properties [Line Items]
Equity Method Investment, Ownership Percentage	100.00%
Initial Investment [Member] | CityLine [Member]
Real Estate Properties [Line Items]
Equity Method Investment, Ownership Percentage	49.00%

XML

Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Land	$ 1,812,797	$ 1,801,576
Under development:
Real estate under development (net of accumulated depreciation of $0 and $0, respectively)	393,837	342,282
Real estate owned	9,787,569	9,615,753
Real Estates Owned Accumulated Depreciation	(3,026,660)	(2,923,625)
Real estate owned, net	6,760,909	6,692,128
Land [Member]
Under development:
Real estate under development (net of accumulated depreciation of $0 and $0, respectively)	111,028	111,028
Real Estate Held-for-sale	0	1,104
Construction in progress [Member]
Under development:
Real estate under development (net of accumulated depreciation of $0 and $0, respectively)	282,809	231,254
Building and Building Improvements [Member]
Under development:
Real Estate Held-for-sale	0	520
United Dominion Reality L.P. [Member]
Property, Plant and Equipment [Line Items]
Land	837,945	836,644
Depreciable property - held and used:
Building, improvements, and furniture, fixture and equipment	2,848,389	2,838,060
Under development:
Real estate owned	3,686,334	3,674,704
Real Estates Owned Accumulated Depreciation	(1,445,528)
Real estate owned, net	$ 2,240,806	$ 2,265,889

XML

Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Communities Apartment_Homes States	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Real Estate Owned (Textual) [Abstract]
Number of communities owned (in communities) | Communities	128
Number of states operating within (in states)	10
Number of apartments owned (in apartments homes) | Apartment_Homes	39,698
Number of communities acquired apartment homes are within | Communities	0
Development costs excluding direct costs and capitlized interest	$ 2,800	$ 2,000
Interest capitalized during period	4,700	4,200
Other Cost and Expense, Operating	1,691	1,752
Proceeds from Sale of Property, Plant, and Equipment	3,500
Deferred profit from the sale of properties	9,700		$ 9,500
Casualty-related (recoveries)/charges, net	502	0
Payments for (Proceeds from) Investments	$ 3,300
United Dominion Reality L.P. [Member]
Real Estate Owned (Textual) [Abstract]
Number of communities owned (in communities) | Communities	54
Number of states operating within (in states) | States	8
Number of apartments owned (in apartments homes) | Apartment_Homes	16,698
Development costs excluding direct costs and capitlized interest	$ 300	300
Interest capitalized during period	100	100
Other Cost and Expense, Operating	1,548	1,500
Casualty-related (recoveries)/charges, net	$ 553	$ 0

XML

Joint Ventures (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Communities	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Financial information relating to unconsolidated joint ventures operations
Income/(loss) from unconsolidated entities	$ 11,198	$ 679
Combined summary of balance sheets relating to unconsolidated joint ventures
Investment in unconsolidated entities	818,990		$ 827,025
Deferred gains on the sale of depreciable property	$ 9,700		9,500
Number of Real Estate Properties | Communities	128
Investments in and advances to unconsolidated joint ventures, net	$ 818,990		827,025
Unconsolidated Joint Ventures [Member]
Financial information relating to unconsolidated joint ventures operations
Total revenues	58,524	55,037
Equity Method Investment Summarized Financial Information Property Operating Expense	(21,834)	(23,413)
Real estate depreciation and amortization	(23,333)	(18,943)
Net income /(loss)	(4,333)	(3,500)
Combined summary of balance sheets relating to unconsolidated joint ventures
Total real estate, net	2,904,183		2,901,067
Equity Method Investment Summarized Financial Information Cash and cash equivalents	28,676		32,503
Equity Method Investment Summarized Financial Information Other assets	17,288		19,047
Total assets	2,950,147		2,952,617
Amount due to UDR	2,746		521
Third party debt	1,811,490		1,794,379
Equity Method Investment Summarized Financial Information Accounts payable and accrued liabilities	55,471		66,391
Total liabilities	1,869,707		1,861,291
Total equity	1,080,440		1,091,326
Investment in unconsolidated entities	579,642		582,719
Equity Method of Investment Summarized Financial Information Operating income/(loss)	13,357	12,681
Equity Method Investment Summarized Financial Information Interest expense	$ (17,690)	(16,181)
Preferred Equity Investment West Coast Development JV [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Equity Method Investment, Ownership Percentage	48.00%
Equity Method Investment, Preferred Return		12,766
Number of Real Estate Properties	5
Operating Community [Member] | Unconsolidated Joint Venture UDR Met Life I Partnership [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Investment in unconsolidated entities	$ 29,182		$ 25,209
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Number of apartment homes	150
Operating Community [Member] | Unconsolidated Joint Venture UDR MetLife II Partnership [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Investment in unconsolidated entities	$ 309,409		$ 311,282
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Number of apartment homes	4,059
Number of Real Estate Properties	18
Operating Community [Member] | Unconsolidated Joint Venture Vitruvian Park [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Investment in unconsolidated entities	$ 73,154		$ 72,414
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Number of apartment homes	1,513
Number of Real Estate Properties	3
Operating Community [Member] | Unconsolidated Joint Venture Three [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Investment in unconsolidated entities	$ 11,801		$ 12,835
Equity Method Investment, Ownership Percentage	30.00%		30.00%
Number of apartment homes	660
Number of Real Estate Properties	3
Operating Community [Member] | Unconsolidated Joint Venture Other MetLife [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Investment in unconsolidated entities	$ 156,096		$ 160,979
Equity Method Investment, Ownership Percentage	50.60%		50.60%
Number of apartment homes	1,437
Number of Real Estate Properties	1
Land Parcel [Member] | Unconsolidated Joint Venture UDR Met Life I Partnership [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Number of Real Estate Properties	1
Land Parcel [Member] | Unconsolidated Joint Venture Vitruvian Park [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Number of Real Estate Properties	5
Development Community [Member] | Unconsolidated Joint Venture Vitruvian Park [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Number of Real Estate Properties	1
Development Community [Member] | Unconsolidated Joint Venture Other MetLife [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Number of Real Estate Properties	4
Development Community [Member] | Participating Loan Investment Steele Creek Denver Colorado [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Investment in unconsolidated entities	$ 94,002		$ 94,003
Income from Participating Loan	$ 1,533	1,519
Participating Loan, Interest Rate, Stated Percentage	6.50%
Participating Loan Years to Maturity	4 months
Development Community [Member] | Preferred Equity Investment West Coast Development JV [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Investment in unconsolidated entities	$ 145,346		$ 150,303
Equity Method Investment, Preferred Return		$ 1,427
Participating Loan, Interest Rate, Stated Percentage	6.50%

XML

Joint Ventures (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Communities	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Casualty-related (recoveries)/charges, net	$ 502	$ 0
Proceeds from Sale of Property, Plant, and Equipment	3,500
Gain/(loss) on sale of real estate owned	$ 2,132	$ 3,070
Number of Real Estate Properties | Communities	128
Community Threshold, Period Above Occupancy Threshold	3 months	3 months
Secured Debt	$ 1,031,507		$ 1,130,858
Joint Ventures
Real Estate Owned Gross	9,787,569		9,615,753
Unamortized discount	10,400		11,200
First installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture	269,878
Second installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture	510,675
Interest expense	(30,539)	$ (31,104)
Investment in unconsolidated entities	818,990		827,025
Deferred profit from the sale of properties	9,700		9,500
Investment in unconsolidated joint ventures	24,193	13,262
Management fees for our involvement in the joint ventures	$ 2,600	2,800
Condition for Community considered to have stabilized occupancy	0.9
Number of Apartment Homes Acquired	155
717 Olympic [Member]
Schedule of Equity Method Investments [Line Items]
Casualty-related (recoveries)/charges, net	$ 900	(1,100)
Unconsolidated Joint Venture UDR Met Life I Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Number of apartments of development community	0
Unconsolidated Joint Venture 399 Fremont [Member]
Schedule of Equity Method Investments [Line Items]
Number of apartments of development community	1,018
Preferred Equity Investment West Coast Development JV [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment Cost of Ownership Interest	$ 136,300
Number of Real Estate Properties	5
Total Fixed Price Option Sales Price	$ 597,400
Community Threshold, Period Above Occupancy Threshold	90 days
Joint Ventures
Equity Method Investment, Preferred Return		12,766
Equity Method Investment, Ownership Percentage	48.00%
Number of Completed Communities	3
Number of Remaining Communities	4
Number of Stabilized Communities	2
Number of Non Stabilized Communities	2
Condition for Community considered to have stabilized occupancy	0.8
CityLine [Member]
Joint Ventures
Investment in unconsolidated joint ventures	$ 66,000
Number of Apartment Homes Acquired	244
Preferred Equity Method Investment West Coast Development JV Cityline II [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment Cost of Ownership Interest	$ 15,500
Total Fixed Price Option Sales Price	$ 61,300
Joint Ventures
Equity Method Investment, Ownership Percentage	49.00%
Hold Period	1 year
Operating Community [Member] | Unconsolidated Joint Venture Vitruvian Park [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	3
Number of apartment homes	1,513
Joint Ventures
Investment in unconsolidated entities	$ 73,154		$ 72,414
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Operating Community [Member] | Unconsolidated Joint Venture UDR Met Life I Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Number of apartment homes	150
Joint Ventures
Investment in unconsolidated entities	$ 29,182		$ 25,209
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Operating Community [Member] | Unconsolidated Joint Venture UDR MetLife II Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	18
Number of apartment homes	4,059
Joint Ventures
Investment in unconsolidated entities	$ 309,409		$ 311,282
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Operating Community [Member] | Unconsolidated Joint Venture Three Washington DC [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	3
Number of apartment homes	660
Joint Ventures
Investment in unconsolidated entities	$ 11,801		$ 12,835
Equity Method Investment, Ownership Percentage	30.00%		30.00%
Operating Community [Member] | Unconsolidated Joint Venture Other MetLife [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	1
Number of apartment homes	1,437
Joint Ventures
Investment in unconsolidated entities	$ 156,096		$ 160,979
Equity Method Investment, Ownership Percentage	50.60%		50.60%
Development Community [Member] | Unconsolidated Joint Venture Vitruvian Park [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	1
Development Community [Member] | Unconsolidated Joint Venture Other MetLife [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	4
Development Community [Member] | Preferred Equity Investment West Coast Development JV [Member]
Joint Ventures
Investment in unconsolidated entities	$ 145,346		$ 150,303
Equity Method Investment, Preferred Return		$ 1,427
Participating Loan, Interest Rate, Stated Percentage	6.50%
Development Community [Member] | Preferred Equity Method Investment West Coast Development JV Cityline II [Member]
Joint Ventures
Participating Loan, Interest Rate, Stated Percentage	6.50%
Subsequent Investment [Member] | CityLine [Member]
Joint Ventures
Equity Method Investment, Ownership Percentage	100.00%
Initial Investment [Member] | CityLine [Member]
Joint Ventures
Equity Method Investment, Ownership Percentage	49.00%

XML

Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Equity Method Investments	$ 818,990		$ 827,025
Income/(loss) from unconsolidated entities	11,198	$ 679
United Dominion Reality L.P. [Member]
Equity Method Investment Summarized Financial Information Real Estate, Net	1,400,046		1,413,983
Equity Method Investment Summarized Financial Information Cash and cash equivalents	35		66
Equity Method Investment Summarized Financial Information Other assets	4,498		4,843
Equity Method Investment, Summarized Financial Information, Assets	1,531,079		1,545,392
Equity Method Investment Summarized Financial Information Accounts payable and accrued liabilities	23,976		27,571
Equity Method Investment, Summarized Financial Information, Liabilities	466,148		471,178
Equity Method Investment Summarized Financial Information, Equity	1,064,931		1,074,214
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	1,531,079		1,545,392
Equity Method Investments	103,267		112,867
Income/(loss) from unconsolidated entities	(5,424)	(13,387)
UDR Lighthouse DownREIT L.P. [Member] | United Dominion Reality L.P. [Member]
Equity Method Investment Summarized Financial Instrument, Note Receivable	126,500		126,500
Equity Method Investment Summarized Financial Information, Secured Debt, Net	442,172		$ 443,607
Equity Method Investment, Summarized Financial Information, Revenue	33,298	31,617
Equity Method Investment Summarized Financial Information Property Operating Expense	(13,976)	(14,269)
Equity Method Investment Summarized Financial Information Depreciation Amortization	(20,608)	(30,053)
Equity Method of Investment Summarized Financial Information Operating income/(loss)	(1,286)	(12,705)
Equity Method Investment Summarized Financial Information Interest expense	(3,860)	(3,741)
Equity Method Investment Summarized Financial Information Other income/(expense)	1,166	1,180
Net income /(loss)	$ (3,980)	$ (15,266)

XML

Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) (Details Textual) $ in Thousands	Mar. 31, 2017 USD ($) Communities Apartment_Homes	Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties | Communities	128
Number of apartment homes owned and consolidated by the Company | Apartment_Homes	39,698
Equity Method Investments | $	$ 818,990	$ 827,025
United Dominion Reality L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties | Communities	54
Number of apartment homes owned and consolidated by the Company | Apartment_Homes	16,698
Equity Method Investments | $	$ 103,267	$ 112,867
United Dominion Reality L.P. [Member] | UDR Lighthouse DownREIT L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties | Communities	13
Number of apartment homes owned and consolidated by the Company | Apartment_Homes	6,261

XML

Secured and Unsecured Debt (Details)	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016	Dec. 31, 2016 USD ($)
Secured debt instruments
Weighted average interest rate	3.67%
Long-term Debt	$ 3,537,292,000		$ 3,401,478,000
Unsecured Debt	$ 2,505,785,000		2,270,620,000
Weighted Average Years to Maturity	4 years 7 months 23 days
Commercial Paper, at Carrying Value	$ 220,000,000		0
Line of Credit Facility, Amount Outstanding	$ 2,900,000		2,900,000
Commercial Paper [Member]
Secured debt instruments
Weighted average interest rate	1.24%	0.00%
Weighted Average Years to Maturity	18 days
Fixed Rate Debt [Member]
Secured debt instruments
Principal outstanding	$ 754,489,000		756,151,000
Weighted average interest rate	4.53%
Weighted Average Years to Maturity	4 years 4 months 24 days
Number of Communities Encumbered	17
Variable Rate Debt [Member]
Secured debt instruments
Principal outstanding	$ 277,018,000		374,707,000
Weighted average interest rate	1.84%
Weighted Average Years to Maturity	2 years 10 months 9 days
Number of Communities Encumbered	7
Mortgages Notes Payable [Member] | Fixed Rate Debt [Member]
Secured debt instruments
Weighted average interest rate	4.04%
Weighted Average Years to Maturity	6 years 21 days
Number of Communities Encumbered	7
Tax-exempt secured notes payable [Member] | Variable Rate Debt [Member]
Secured debt instruments
Weighted average interest rate	1.42%
Weighted Average Years to Maturity	5 years 11 months 8 days
Number of Communities Encumbered	2
Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
Secured debt instruments
Weighted average interest rate	5.06%
Weighted Average Years to Maturity	2 years 6 months 25 days
Number of Communities Encumbered	10
Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
Secured debt instruments
Weighted average interest rate	2.05%
Weighted Average Years to Maturity	1 year 3 months 5 days
Number of Communities Encumbered	5
Secured Debt [Member]
Secured debt instruments
Principal outstanding	$ 1,031,507,000		1,130,858,000
Weighted average interest rate	3.80%
Long-term Debt	$ 1,031,507,000
Weighted Average Years to Maturity	3 years 11 months 24 days
Number of Communities Encumbered	24
Secured Debt [Member] | Fixed Rate Debt [Member]
Secured debt instruments
Long-term Debt	$ 754,489,000
Secured Debt [Member] | Variable Rate Debt [Member]
Secured debt instruments
Long-term Debt	$ 277,018,000
Unsecured Revolving Credit Facility due October 2015 [Member]
Secured debt instruments
Weighted average interest rate	0.00%
Weighted Average Years to Maturity	2 years 10 months
Line of Credit Facility, Amount Outstanding	$ 0		0
Unsecured Working Capital Credit Facility due January 2019 [Member]
Secured debt instruments
Weighted average interest rate	1.88%
Weighted Average Years to Maturity	1 year 9 months 1 day
Line of Credit Facility, Amount Outstanding	$ 36,140,000		21,350,000
1.21% Term Loan Facility due January 2021 [Member]
Secured debt instruments
Weighted average interest rate	1.73%
Senior Notes	$ 35,000,000		35,000,000
Weighted Average Years to Maturity	3 years 9 months 29 days
ThreePointSevenTermNotesDueOctober2020 [Member]
Secured debt instruments
Senior Notes	$ 299,972,000		299,970,000
Weighted Average Years to Maturity	3 years 6 months 1 day
2.23% Term Loan Facility due January 2021 [Member]
Secured debt instruments
Weighted average interest rate	2.34%
Senior Notes	$ 315,000,000		315,000,000
Weighted Average Years to Maturity	3 years 9 months 29 days
Four Point Six Three Percent Term Medium Notes Due January Two Thousand Twenty-Two [Member]
Secured debt instruments
Weighted average interest rate	4.63%
Senior Notes	$ 398,285,000		398,195,000
Weighted Average Years to Maturity	4 years 9 months 10 days
3.75 MTN Due July 2024 [Member]
Secured debt instruments
Weighted average interest rate	3.75%
Senior Notes	$ 299,244,000		299,218,000
Weighted Average Years to Maturity	7 years 3 months 1 day
Three point seven percent medium term note due October 2020 [Member]
Secured debt instruments
Weighted average interest rate	3.70%
Eight Point Five Zero Percent, Debentures, Due September 2024 [Member]
Secured debt instruments
Weighted average interest rate	8.50%
Senior Notes	$ 15,644,000		15,644,000
Weighted Average Years to Maturity	7 years 5 months 15 days
4.00% Medium-Term Note due October 2025 [Member]
Secured debt instruments
Weighted average interest rate	4.00%
Senior Notes	$ 299,415,000		299,398,000
Weighted Average Years to Maturity	8 years 6 months 1 day
2.95% Medium-Term Note due September 2026 [Member]
Secured debt instruments
Weighted average interest rate	2.95%
Senior Notes	$ 300,000,000		300,000,000
Weighted Average Years to Maturity	9 years 5 months 1 day
Four Point Two Five Percentage Medium-Term Notes due June 2018 [Member]
Secured debt instruments
Weighted average interest rate	4.25%
Senior Notes	$ 299,499,000		299,392,000
Weighted Average Years to Maturity	1 year 2 months 1 day
Other [Member]
Secured debt instruments
Senior Notes	$ 21,000		21,000
Unsecured Debt [Member]
Secured debt instruments
Weighted average interest rate	3.52%
Long-term Debt	$ 2,505,785,000
Unsecured Debt	$ 2,505,785,000		2,270,620,000
Weighted Average Years to Maturity	4 years 11 months 1 day
Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mortgages Notes Payable [Member] | Mortgages Notes Payable [Member] | Fixed Rate Debt [Member]
Secured debt instruments
Principal outstanding	$ 401,135,000		402,996,000
Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fannie Mae credit facilities [Member] | Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
Secured debt instruments
Principal outstanding	355,836,000		355,836,000
Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fannie Mae credit facilities [Member] | Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
Secured debt instruments
Principal outstanding	182,606,000		280,946,000
Unsecured Debt [Member]
Secured debt instruments
Deferred Finance Costs, Net	(12,435,000)		(12,568,000)
Secured Debt [Member] | Variable Rate Debt [Member]
Secured debt instruments
Deferred Finance Costs, Net	(288,000)		(939,000)
Secured Debt [Member] | Fixed Rate Debt [Member]
Secured debt instruments
Deferred Finance Costs, Net	$ (2,482,000)		$ (2,681,000)

XML

Secured and Unsecured Debt (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Line of Credit Facility [Line Items]
Unamortized discount	$ 10,400		$ 11,200
Secured credit facilities
Borrowings outstanding	$ 2,900		2,900
Debt Instrument Weighted Average Years to Maturity	4 years 7 months 23 days
Fannie Mae [Member]
Secured credit facilities
Borrowings outstanding	$ 538,442		$ 636,782
Weighted average daily borrowings during the period ended	604,002	$ 737,802
Maximum daily borrowings during the period ended	$ 636,782	$ 813,544
Weighted average interest rate during the period ended	3.89%	3.90%
Interest rate at the end of the period	4.04%		3.80%
Four Point Two Five Percentage Medium-Term Notes due June 2018 [Member]
Line of Credit Facility [Line Items]
Unamortized discount	$ 501		$ 608
Secured credit facilities
Debt Instrument Weighted Average Years to Maturity	1 year 2 months 1 day
Three point seven percent medium term note due October 2020 [Member]
Line of Credit Facility [Line Items]
Unamortized discount	$ 28		30
Four Point Six Three Percent Term Medium Notes Due January Two Thousand Twenty-Two [Member]
Line of Credit Facility [Line Items]
Unamortized discount	$ 1,715		1,805
Secured credit facilities
Debt Instrument Weighted Average Years to Maturity	4 years 9 months 10 days
3.75 MTN Due July 2024 [Member]
Line of Credit Facility [Line Items]
Unamortized discount	$ 756		$ 782
Secured credit facilities
Debt Instrument Weighted Average Years to Maturity	7 years 3 months 1 day
Variable Rate Debt [Member]
Secured credit facilities
Debt Instrument Weighted Average Years to Maturity	2 years 10 months 9 days

XML

Secured and Unsecured Debt (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Secured Debt, Encumbers Real Estate Owned, Amount	$ 1,900,000
Secured Debt, Encumbers Real Estate Owned, Percent	19.70%
Debt Instrument Weighted Average Years to Maturity	4 years 7 months 23 days
Unamortized discount	$ 10,400	$ 11,200
Aggregate maturities of secured debt
2014	269,878
2015	510,675
2016	353,235
2017	498,076
2018	351,117
Total	1,031,507	1,130,858
Secured Debt, Unencumbered Real Estate Owned, Amount	$ 7,900,000
Secured Debt, Unencumbered Real Estate Owned, Percent	80.30%
Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	4 years 4 months 24 days
Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	2 years 10 months 9 days
ThreePointSevenTermNotesDueOctober2020 [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	3 years 6 months 1 day
Four Point Six Three Percent Term Medium Notes Due January Two Thousand Twenty-Two [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	4 years 9 months 10 days
Unamortized discount	$ 1,715	1,805
Mortgages Notes Payable [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	6 years 21 days
Tax Exempt Notes Payable [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	5 years 11 months 8 days
Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	2 years 6 months 25 days
Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	1 year 3 months 5 days
3.75 MTN Due July 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	7 years 3 months 1 day
Unamortized discount	$ 756	$ 782

XML

Secured and Unsecured Debt (Details 3) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Summary of unsecured debt
Unsecured Debt, Total	$ 2,505,785	$ 2,270,620
Unamortized discount	10,400	11,200
4.63% Medium-Term Notes due January 2022 [Member]
Summary of unsecured debt
Senior Unsecured Notes	398,285	398,195
Unamortized discount	1,715	1,805
8.50% Debentures due September 2024 [Member]
Summary of unsecured debt
Senior Unsecured Notes	15,644	15,644
4.25% Medium-Term Notes due June 2018 [Member]
Summary of unsecured debt
Senior Unsecured Notes	299,499	299,392
Unamortized discount	501	608
Other [Member]
Summary of unsecured debt
Senior Unsecured Notes	$ 21	$ 21

XML

Secured and Unsecured Debt (Details 4) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Borrowings outstanding at end of period	$ 2,900
Unsecured Commercial Bank Credit Facility [Member]
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Total revolving credit facility	2,000,000		$ 1,100,000
Weighted average daily borrowings during the period ended	9,222	$ 161,505
Maximum daily borrowings during the period ended	$ 120,000	$ 340,000
Weighted average interest rate during the period ended	1.60%	1.40%
Interest rate at the end of the period	0.00%		0.00%
Unsecured Working Capital Credit Facility due January 2019 [Member]
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Total revolving credit facility	$ 75,000		$ 75,000
Borrowings outstanding at end of period	36,140
Weighted average daily borrowings during the period ended	26,714	$ 21,936
Maximum daily borrowings during the period ended	$ 67,799	$ 69,633
Weighted average interest rate during the period ended	1.70%	1.40%
Interest rate at the end of the period	1.90%		1.70%

XML

Secured and Unsecured Debt Secured and Unsecured Debt (Details 5) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Short-term Debt [Line Items]
Commercial Paper, Maximum Borrowing Amount	$ 500,000,000		$ 0
Commercial Paper, at Carrying Value	$ 220,000,000		$ 0
Weighted average interest rate	3.67%
Commercial Paper [Member]
Short-term Debt [Line Items]
Short-term Debt, Average Outstanding Amount	$ 80,228,000	$ 0
Short-term Debt, Maximum Amount Outstanding During Period	$ 220,000,000	$ 0
Short-term Debt, Weighted Average Interest Rate	1.153%		0.00%
Weighted average interest rate	1.24%	0.00%

XML

Secured and Unsecured Debt (Details 6) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 3,545,627
Debt Instrument, Unamortized Discount (Premium), Net	(8,335)
Aggregate maturities of unsecured debt
2014	269,878
2015	510,675
2016	353,235
2017	498,076
2018	351,117
Unsecured Debt, Total	2,505,785	$ 2,270,620
Long-term Debt	3,537,292	3,401,478
Long-Term Debt, Maturities, Repayment of Principle in Year Six	401,157
Long-Term Debt, Maturities, Repayment of Principle in Year Seven	41,245
Long-Term Debt, Maturities, Repayment of Principle in Year Eight	315,644
Long-Term Debt, Maturities, Repayment of Principle in Year Nine	427,600
Long-Term Debt, Maturities, Repayment of Principle in Year Ten	350,000
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	27,000
Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	1,023,843
Debt Instrument, Unamortized Discount (Premium), Net	7,664
Aggregate maturities of unsecured debt
2014	49,878
2015	210,675
2016	317,095
2017	198,076
2018	1,117
Long-term Debt	1,031,507
Long-Term Debt, Maturities, Repayment of Principle in Year Six	1,157
Long-Term Debt, Maturities, Repayment of Principle in Year Seven	41,245
Long-Term Debt, Maturities, Repayment of Principle in Year Eight	0
Long-Term Debt, Maturities, Repayment of Principle in Year Nine	127,600
Long-Term Debt, Maturities, Repayment of Principle in Year Ten	50,000
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	27,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	2,521,784
Debt Instrument, Unamortized Discount (Premium), Net	(15,999)
Aggregate maturities of unsecured debt
2014	220,000
2015	300,000
2016	36,140
2017	300,000
2018	350,000
Unsecured Debt, Total	2,505,785	$ 2,270,620
Long-term Debt	2,505,785
Long-Term Debt, Maturities, Repayment of Principle in Year Six	400,000
Long-Term Debt, Maturities, Repayment of Principle in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principle in Year Eight	315,644
Long-Term Debt, Maturities, Repayment of Principle in Year Nine	300,000
Long-Term Debt, Maturities, Repayment of Principle in Year Ten	300,000
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	0
Fixed Rate Debt [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	746,537
Debt Instrument, Unamortized Discount (Premium), Net	7,952
Aggregate maturities of unsecured debt
2014	3,310
2015	74,637
2016	249,395
2017	198,076
2018	1,117
Long-term Debt	754,489
Long-Term Debt, Maturities, Repayment of Principle in Year Six	1,157
Long-Term Debt, Maturities, Repayment of Principle in Year Seven	41,245
Long-Term Debt, Maturities, Repayment of Principle in Year Eight	0
Long-Term Debt, Maturities, Repayment of Principle in Year Nine	127,600
Long-Term Debt, Maturities, Repayment of Principle in Year Ten	50,000
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	0
Variable Rate Debt [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	277,306
Debt Instrument, Unamortized Discount (Premium), Net	(288)
Aggregate maturities of unsecured debt
2014	46,568
2015	136,038
2016	67,700
2017	0
2018	0
Long-term Debt	277,018
Long-Term Debt, Maturities, Repayment of Principle in Year Six	0
Long-Term Debt, Maturities, Repayment of Principle in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principle in Year Eight	0
Long-Term Debt, Maturities, Repayment of Principle in Year Nine	0
Long-Term Debt, Maturities, Repayment of Principle in Year Ten	0
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	$ 27,000

XML

Secured and Unsecured Debt (Details Textual) $ in Thousands		3 Months Ended
	Jun. 27, 2014	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Amortization of Financing Costs		$ 1,100	$ 1,300
Secured Debt (Textual) [Abstract]
Secured debt amount which encumbers real estate owned based upon book value		$ 1,900,000
Percentage of secured debt which encumbers real estate owned based upon book value		19.70%
Secured debt amount of real estate owned which is unencumbered		$ 7,900,000
Percentage of secured debt of real estate owned which is unencumbered		80.30%
Weighted average interest rate		3.67%
Unamortized fair market adjustment		$ 10,400		$ 11,200
Borrowings outstanding		2,900		2,900
Long-term Commercial Paper		500,000
Secured Debt		1,031,507		1,130,858
Repayments of Secured Debt		99,463	2,205
Fixed Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Secured debt including debt on real estate held for sale		$ 754,489		756,151
Weighted average interest rate		4.53%
Variable Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Secured debt including debt on real estate held for sale		$ 277,018		374,707
Weighted average interest rate		1.84%
Repayments of Secured Debt		$ 98,300
Unsecured Debt [Member]
Secured Debt (Textual) [Abstract]
Weighted average interest rate		3.52%
Line of Credit Facility, Interest Rate Description		95
Line of Credit Facility, Description Range Low		90
Line of Credit Facility, Description Range High		175
Unsecured Working Capital Credit Facility due January 2019 [Member]
Secured Debt (Textual) [Abstract]
Credit facilities with aggregate commitment		$ 75,000		75,000
Weighted average interest rate		1.88%
Borrowings outstanding		$ 36,140		21,350
Line of Credit Facility, Interest Rate Description		90
Line of Credit Facility, Description Range Low		85
Line of Credit Facility, Description Range High		155
3.75 MTN Due July 2024 [Member]
Secured Debt (Textual) [Abstract]
Weighted average interest rate		3.75%
Unamortized fair market adjustment		$ 756		782
Debt Instrument, Maturity Date	Jul. 01, 2024
Senior Notes		$ 299,244		299,218
Mortgages Notes Payable [Member] | Fixed Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Weighted average interest rate		4.04%
Debt Instrument, Maturity Date Range, Start		May 01, 2019
Debt instrument, maturity date range, end		Nov. 05, 2026
Notes payable minimum interest rates range		3.15%
Notes payable maximum interest rates range		5.86%
Debt Assumed As Part of Acquisition [Member]
Secured Debt (Textual) [Abstract]
Amortization of Debt Discount (Premium)		$ 700	$ 800
Tax Exempt Notes Payable [Member] | Variable Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Weighted average interest rate		1.42%
Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Weighted average interest rate		5.06%
Debt Instrument, Maturity Date Range, Start		May 01, 2017
Debt instrument, maturity date range, end		Jul. 01, 2020
Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Weighted average interest rate		2.05%
Tax Exempt Secured Notes Payable [Member] | Variable Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Debt Instrument, Maturity Date Range, Start		Aug. 01, 2019
Debt instrument, maturity date range, end		Mar. 20, 2032
Notes payable minimum interest rates range		1.39%
Notes payable maximum interest rates range		1.44%
Fannie Mae [Member]
Secured Debt (Textual) [Abstract]
Borrowings outstanding		$ 538,442		636,782
Revolving Credit Facility [Member]
Secured Debt (Textual) [Abstract]
Line of Credit Facility, Interest Rate Description		90
Line of Credit Facility, Description Range Low		85
Line of Credit Facility, Description Range High		155
Line of Credit Facility, Commitment Fee Description Range Low		12.5
Line of Credit Facility, Commitment Fee Description Range High		30
Line of Credit Facility, Commitment Fee Description		15
4.00% Medium-Term Note due October 2025 [Member]
Secured Debt (Textual) [Abstract]
Weighted average interest rate		4.00%
Portion of Medium Term Note subject to Interest Rate Swaps		$ 200,000
Long-term Debt, Weighted Average Interest Rate		4.55%
Senior Notes		$ 299,415		299,398
2.95% Medium-Term Note due September 2026 [Member]
Secured Debt (Textual) [Abstract]
Weighted average interest rate		2.95%
Senior Notes		$ 300,000		300,000
UDR Bank Credit Facility [Member]
Secured Debt (Textual) [Abstract]
Credit facilities with aggregate commitment		$ 2,000,000		1,100,000
Number of Extensions of loan		2
Extension period of option on loan		6 months
Debt Instrument, Maturity Date		Jan. 31, 2020
UDR Bank Credit Facility [Member] | Unsecured Debt [Member]
Secured Debt (Textual) [Abstract]
Credit facilities with aggregate commitment		$ 350,000
Debt Instrument, Maturity Date		Jan. 29, 2021
UDR Bank Credit Facility [Member] | Revolving Credit Facility [Member]
Secured Debt (Textual) [Abstract]
Credit facilities with aggregate commitment		$ 1,100,000
Unsecured Working Capital Credit Facility due January 2019 [Member]
Secured Debt (Textual) [Abstract]
Credit facilities with aggregate commitment		75,000
Fannie Mae credit facilities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Secured debt including debt on real estate held for sale		355,836		355,836
Fannie Mae credit facilities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Secured debt including debt on real estate held for sale		182,606		280,946
Mortgages Notes Payable [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Mortgages Notes Payable [Member] | Fixed Rate Debt [Member]
Secured Debt (Textual) [Abstract]
Secured debt including debt on real estate held for sale		$ 401,135		$ 402,996

XML

Secured and Unsecured Debt (Details Textual 1) - USD ($) $ in Thousands		3 Months Ended
	Sep. 26, 2013	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Amortization of Financing Costs		$ 1,100	$ 1,300
Unsecured Debt (Textual) [Abstract]
Line of Credit Facility, Amount Outstanding		2,900		$ 2,900
Unamortized discount		$ 10,400		11,200
Debt Instrument, Interest Rate During Period		3.67%
ThreePointSevenTermNotesDueOctober2020 [Member]
Unsecured Debt (Textual) [Abstract]
Debt Instrument, Maturity Date	Oct. 31, 2020
Senior Notes		$ 299,972		299,970
4.63% Medium-Term Notes due January 2022 [Member]
Unsecured Debt (Textual) [Abstract]
Unamortized discount		1,715		1,805
Senior Notes		$ 398,285		398,195
Debt Instrument, Interest Rate During Period		4.63%
UDR Bank Credit Facility [Member]
Unsecured Debt (Textual) [Abstract]
Total revolving credit facility		$ 2,000,000		$ 1,100,000
Interest rate		0.00%		0.00%
Debt Instrument, Maturity Date		Jan. 31, 2020

XML

Debt (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Communities	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Weighted average interest rate	3.67%
Debt Instrument Weighted Average Years to Maturity	4 years 7 months 23 days
Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 754,489	$ 756,151
Weighted average interest rate	4.53%
Debt Instrument Weighted Average Years to Maturity	4 years 4 months 24 days
Number of Communities Encumbered (in communities)	17
Fixed Rate Debt [Member] | Mortgages Notes Payable [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.04%
Debt Instrument Weighted Average Years to Maturity	6 years 21 days
Number of Communities Encumbered (in communities)	7
Fixed Rate Debt [Member] | Fannie Mae credit facilities [Member]
Debt Instrument [Line Items]
Weighted average interest rate	5.06%
Debt Instrument Weighted Average Years to Maturity	2 years 6 months 25 days
Number of Communities Encumbered (in communities)	10
Variable Rate Debt [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 277,018	374,707
Weighted average interest rate	1.84%
Debt Instrument Weighted Average Years to Maturity	2 years 10 months 9 days
Number of Communities Encumbered (in communities)	7
Variable Rate Debt [Member] | Fannie Mae credit facilities [Member]
Debt Instrument [Line Items]
Weighted average interest rate	2.05%
Debt Instrument Weighted Average Years to Maturity	1 year 3 months 5 days
Number of Communities Encumbered (in communities)	5
Variable Rate Debt [Member] | Tax Exempt Notes Payable [Member]
Debt Instrument [Line Items]
Weighted average interest rate	1.42%
Debt Instrument Weighted Average Years to Maturity	5 years 11 months 8 days
Number of Communities Encumbered (in communities)	2
United Dominion Reality L.P. [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 336,240	433,974
Weighted average interest rate	4.26%
Debt Instrument Weighted Average Years to Maturity	3 years 4 months 14 days
Number of Communities Encumbered (in communities) | Communities	9
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 228,152	243,842
Weighted average interest rate	5.07%
Debt Instrument Weighted Average Years to Maturity	2 years 6 months 27 days
Number of Communities Encumbered (in communities) | Communities	6
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member] | Fannie Mae credit facilities [Member]
Debt Instrument [Line Items]
Weighted average interest rate	5.07%
Debt Instrument Weighted Average Years to Maturity	2 years 6 months 27 days
Number of Communities Encumbered (in communities) | Communities	6
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 108,088	190,132
Weighted average interest rate	2.10%
Debt Instrument Weighted Average Years to Maturity	5 years
Number of Communities Encumbered (in communities) | Communities	3
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member] | Fannie Mae credit facilities [Member]
Debt Instrument [Line Items]
Weighted average interest rate	2.34%
Debt Instrument Weighted Average Years to Maturity	1 year 8 months 1 day
Number of Communities Encumbered (in communities) | Communities	2
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member] | Tax Exempt Notes Payable [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 27,000	27,000
Weighted average interest rate	1.39%
Debt Instrument Weighted Average Years to Maturity	14 years 11 months 19 days
Number of Communities Encumbered (in communities) | Communities	1
Fannie Mae credit facilities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Fixed Rate Debt [Member] | Fannie Mae credit facilities [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 355,836	355,836
Fannie Mae credit facilities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | Variable Rate Debt [Member] | Fannie Mae credit facilities [Member]
Debt Instrument [Line Items]
Principal outstanding	182,606	280,946
Fannie Mae credit facilities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member] | Fannie Mae credit facilities [Member]
Debt Instrument [Line Items]
Principal outstanding	228,870	244,912
Fannie Mae credit facilities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member] | United Dominion Reality L.P. [Member] | Variable Rate Debt [Member] | Fannie Mae credit facilities [Member]
Debt Instrument [Line Items]
Principal outstanding	81,339	163,637
Secured Debt [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Deferred Finance Costs, Net	(288)	(939)
Secured Debt [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Deferred Finance Costs, Net	(2,482)	(2,681)
Secured Debt [Member] | United Dominion Reality L.P. [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Deferred Finance Costs, Net	(251)	(505)
Secured Debt [Member] | United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Deferred Finance Costs, Net	$ (718)	$ (1,070)

XML

Debt (UNITED DOMINION REALTY, L.P.) (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	4 years 7 months 23 days
Borrowings outstanding	$ 2,900		$ 2,900
Fannie Mae [Member]
Debt Instrument [Line Items]
Borrowings outstanding	538,442		$ 636,782
Weighted average daily borrowings during the period ended	604,002	$ 737,802
Maximum daily borrowings during the period ended	$ 636,782	$ 813,544
Weighted average interest rate during the period ended	3.89%	3.90%
Interest rate at the end of the period	4.04%		3.80%
United Dominion Reality L.P. [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	3 years 4 months 14 days
United Dominion Reality L.P. [Member] | Fannie Mae [Member]
Debt Instrument [Line Items]
Borrowings outstanding	$ 310,209		$ 408,549
Weighted average daily borrowings during the period ended	375,770	$ 414,759
Maximum daily borrowings during the period ended	$ 408,549	$ 421,001
Weighted average interest rate during the period ended	4.10%	3.90%
Interest rate at the end of the period	4.40%		4.00%
Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	4 years 4 months 24 days
Fixed Rate Debt [Member] | Mortgages [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	6 years 21 days
Fixed Rate Debt [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	2 years 6 months 25 days
Fixed Rate Debt [Member] | United Dominion Reality L.P. [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	2 years 6 months 27 days
Fixed Rate Debt [Member] | United Dominion Reality L.P. [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	2 years 6 months 27 days
Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	2 years 10 months 9 days
Variable Rate Debt [Member] | Tax Exempt Notes Payable [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	5 years 11 months 8 days
Variable Rate Debt [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	1 year 3 months 5 days
Variable Rate Debt [Member] | United Dominion Reality L.P. [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	5 years
Variable Rate Debt [Member] | United Dominion Reality L.P. [Member] | Tax Exempt Notes Payable [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	14 years 11 months 19 days
Variable Rate Debt [Member] | United Dominion Reality L.P. [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity	1 year 8 months 1 day

XML

Debt (UNITED DOMINION REALTY, L.P.) (Details 2) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
2014	$ 269,878
2015	510,675
2016	353,235
2017	498,076
2018	351,117
Long-term Debt, Gross	3,545,627
Debt Instrument, Unamortized Discount (Premium), Net	(8,335)
Total	1,031,507	$ 1,130,858
Long-Term Debt, Maturities, Repayment of Principle in Year Six	401,157
Long-Term Debt, Maturities, Repayment of Principle in Year Seven	41,245
Long-Term Debt, Maturities, Repayment of Principle in Year Eight	315,644
Long-Term Debt, Maturities, Repayment of Principle in Year Nine	427,600
Long-Term Debt, Maturities, Repayment of Principle in Year Ten	350,000
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	27,000
United Dominion Reality L.P. [Member]
Debt Instrument [Line Items]
2014	0
2015	123,193
2016	133,204
2017	53,812
2018	0
Thereafter	27,000
Long-term Debt, Gross	337,209
Debt Instrument, Unamortized Discount (Premium), Net	(969)
Total	336,240	$ 433,974
Long-Term Debt, Maturities, Repayment of Principle in Year Six	0
Long-Term Debt, Maturities, Repayment of Principle in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principle in Year Eight	0
Long-Term Debt, Maturities, Repayment of Principle in Year Nine	0
Long-Term Debt, Maturities, Repayment of Principle in Year Ten	0
United Dominion Reality L.P. [Member] | Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
2014	0
2015	41,854
2016	133,204
2017	53,812
2018	0
Long-term Debt, Gross	228,870
Debt Instrument, Unamortized Discount (Premium), Net	(718)
Total	228,152
Long-Term Debt, Maturities, Repayment of Principle in Year Six	0
Long-Term Debt, Maturities, Repayment of Principle in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principle in Year Eight	0
Long-Term Debt, Maturities, Repayment of Principle in Year Nine	0
Long-Term Debt, Maturities, Repayment of Principle in Year Ten	0
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	0
United Dominion Reality L.P. [Member] | Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
2014	0
2015	81,339
2016	0
2017	0
2018	0
Long-term Debt, Gross	81,339
Debt Instrument, Unamortized Discount (Premium), Net	(167)
Total	81,172
Long-Term Debt, Maturities, Repayment of Principle in Year Six	0
Long-Term Debt, Maturities, Repayment of Principle in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principle in Year Eight	0
Long-Term Debt, Maturities, Repayment of Principle in Year Nine	0
Long-Term Debt, Maturities, Repayment of Principle in Year Ten	0
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	0
United Dominion Reality L.P. [Member] | Tax Exempt Notes Payable [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
2014	0
2015	0
2016	0
2017	0
2018	0
Long-term Debt, Gross	27,000
Debt Instrument, Unamortized Discount (Premium), Net	(84)
Total	26,916
Long-Term Debt, Maturities, Repayment of Principle in Year Six	0
Long-Term Debt, Maturities, Repayment of Principle in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principle in Year Eight	0
Long-Term Debt, Maturities, Repayment of Principle in Year Nine	0
Long-Term Debt, Maturities, Repayment of Principle in Year Ten	0
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	$ 27,000

XML

Debt (UNITED DOMINION REALTY, L.P.) (Details Textual) - USD ($)			3 Months Ended
	Jun. 27, 2014	Sep. 26, 2013	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			4 years 7 months 23 days
Amortization of Financing Costs			$ 1,100,000	$ 1,300,000
Long-term Commercial Paper			500,000,000
Borrowings outstanding			$ 2,900,000		$ 2,900,000
Weighted average interest rate			3.67%
Unamortized fair market adjustment			$ 10,400,000		11,200,000
Commercial Paper, at Carrying Value			220,000,000		0
UDR Bank Credit Facility [Member]
Debt Instrument [Line Items]
Total revolving credit facility			$ 2,000,000,000		1,100,000,000
Debt Instrument, Maturity Date			Jan. 31, 2020
Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			4 years 4 months 24 days
Secured debt including debt on real estate held for sale			$ 754,489,000		756,151,000
Weighted average interest rate			4.53%
Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			2 years 10 months 9 days
Secured debt including debt on real estate held for sale			$ 277,018,000		374,707,000
Weighted average interest rate			1.84%
Fannie Mae [Member]
Debt Instrument [Line Items]
Borrowings outstanding			$ 538,442,000		636,782,000
Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			2 years 6 months 25 days
Debt Instrument, Maturity Date Range, Start			May 01, 2017
Weighted average interest rate			5.06%
Debt Instrument, Maturity Date Range, End			Jul. 01, 2020
Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			1 year 3 months 5 days
Weighted average interest rate			2.05%
Mortgages [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			6 years 21 days
Debt Instrument, Maturity Date Range, Start			May 01, 2019
Weighted average interest rate			4.04%
Notes payable minimum interest rates range			3.15%
Notes payable maximum interest rates range			5.86%
Debt Instrument, Maturity Date Range, End			Nov. 05, 2026
Tax Exempt Notes Payable [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			5 years 11 months 8 days
Weighted average interest rate			1.42%
Unsecured Revolving Credit Facility due October 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			2 years 10 months
Borrowings outstanding			$ 0		0
Weighted average interest rate			0.00%
4.25% Medium-Term Notes due June 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			1 year 2 months 1 day
Weighted average interest rate			4.25%
Unamortized fair market adjustment			$ 501,000		608,000
Debt Instrument, Maturity Date		Jun. 01, 2018
Three point seven percent medium term note due October 2020 [Member]
Debt Instrument [Line Items]
Weighted average interest rate			3.70%
Unamortized fair market adjustment			$ 28,000		30,000
ThreePointSevenTermNotesDueOctober2020 [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			3 years 6 months 1 day
Debt Instrument, Maturity Date		Oct. 31, 2020
2.23% Term Loan Facility due January 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			3 years 9 months 29 days
Weighted average interest rate			2.34%
4.63% Medium-Term Notes due January 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			4 years 9 months 10 days
Weighted average interest rate			4.63%
Unamortized fair market adjustment			$ 1,715,000		1,805,000
3.75 MTN Due July 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			7 years 3 months 1 day
Weighted average interest rate			3.75%
Unamortized fair market adjustment			$ 756,000		782,000
Debt Instrument, Maturity Date	Jul. 01, 2024
4.00% Medium-Term Note due October 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			8 years 6 months 1 day
Weighted average interest rate			4.00%
2.95% Medium-Term Note due September 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			9 years 5 months 1 day
Weighted average interest rate			2.95%
United Dominion Reality L.P. [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			3 years 4 months 14 days
Amortization of Financing Costs			$ 100,000	$ 200,000
Secured debt including debt on real estate held for sale			$ 336,240,000		433,974,000
Weighted average interest rate			4.26%
United Dominion Reality L.P. [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			2 years 6 months 27 days
Secured debt including debt on real estate held for sale			$ 228,152,000		243,842,000
Weighted average interest rate			5.07%
United Dominion Reality L.P. [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			5 years
Secured debt including debt on real estate held for sale			$ 108,088,000		190,132,000
Weighted average interest rate			2.10%
United Dominion Reality L.P. [Member] | Fannie Mae [Member]
Debt Instrument [Line Items]
Borrowings outstanding			$ 310,209,000		408,549,000
United Dominion Reality L.P. [Member] | Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			2 years 6 months 27 days
Debt Instrument, Maturity Date Range, Start			Dec. 01, 2018
Weighted average interest rate			5.07%
United Dominion Reality L.P. [Member] | Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			1 year 8 months 1 day
Weighted average interest rate			2.34%
United Dominion Reality L.P. [Member] | Tax Exempt Notes Payable [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Weighted Average Years to Maturity			14 years 11 months 19 days
Secured debt including debt on real estate held for sale			$ 27,000,000		27,000,000
Weighted average interest rate			1.39%
Debt Instrument, Maturity Date Range, End			Mar. 01, 2032
United Dominion Reality L.P. [Member] | 4.25% Medium-Term Notes due June 2018 [Member] | Financial Guarantee [Member]
Debt Instrument [Line Items]
Guarantor borrowing capacity			$ 300,000,000
United Dominion Reality L.P. [Member] | Three point seven percent medium term note due October 2020 [Member] | Financial Guarantee [Member]
Debt Instrument [Line Items]
Guarantor borrowing capacity			$ 300,000,000
United Dominion Reality L.P. [Member] | 2.23% Term Loan Facility due January 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, End			Jan. 01, 2021
United Dominion Reality L.P. [Member] | 2.23% Term Loan Facility due January 2021 [Member] | Financial Guarantee [Member]
Debt Instrument [Line Items]
Guarantor borrowing capacity			$ 350,000,000
United Dominion Reality L.P. [Member] | 4.63% Medium-Term Notes due January 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, End			Jan. 01, 2022
United Dominion Reality L.P. [Member] | 4.63% Medium-Term Notes due January 2022 [Member] | Financial Guarantee [Member]
Debt Instrument [Line Items]
Guarantor borrowing capacity			$ 400,000,000
United Dominion Reality L.P. [Member] | 3.75 MTN Due July 2024 [Member] | Financial Guarantee [Member]
Debt Instrument [Line Items]
Guarantor borrowing capacity			$ 300,000,000
United Dominion Reality L.P. [Member] | 4.00% Medium-Term Note due October 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, End			Oct. 01, 2025
United Dominion Reality L.P. [Member] | 4.00% Medium-Term Note due October 2025 [Member] | Financial Guarantee [Member]
Debt Instrument [Line Items]
Guarantor borrowing capacity			$ 300,000,000
United Dominion Reality L.P. [Member] | 2.95% Medium-Term Note due September 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, End			Sep. 01, 2026
United Dominion Reality L.P. [Member] | 2.95% Medium-Term Note due September 2026 [Member] | Financial Guarantee [Member]
Debt Instrument [Line Items]
Guarantor borrowing capacity			$ 300,000,000
Mortgages [Member] | Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mortgages [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Secured debt including debt on real estate held for sale			401,135,000		402,996,000
Fannie Mae credit facilities [Member] | Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Secured debt including debt on real estate held for sale			355,836,000		355,836,000
Fannie Mae credit facilities [Member] | Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Secured debt including debt on real estate held for sale			182,606,000		280,946,000
Fannie Mae credit facilities [Member] | Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member]
Debt Instrument [Line Items]
Variable Rate Secured Debt Instruments Fair Value			81,339,000		163,637,000
Fixed Rate Secured Debt Instruments Fair Value			228,870,000		244,912,000
Fannie Mae credit facilities [Member] | Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Fannie Mae credit facilities [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Secured debt including debt on real estate held for sale			228,870,000		244,912,000
Fannie Mae credit facilities [Member] | Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Fannie Mae credit facilities [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Secured debt including debt on real estate held for sale			$ 81,339,000		$ 163,637,000

XML

Income/(Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income/(loss) from continuing operations	$ 26,264	$ 8,534
Net Income (Loss) Attributable to Noncontrolling Interest	91	306
Income/(loss) from continuing operations attributable to UDR, Inc.	25,967	10,393
Distributions to preferred stockholders - Series E (Convertible)	(929)	(929)
Income/(loss) from continuing operations operations attributable to common stockholders	25,038	9,464
Net income/(loss)	28,396	11,604
Net (income)/loss attributable to noncontrolling interests	(101)
Net (income)/loss attributable to redeemable non-controlling interests in Operating Partnership	2,338	905
Net income/(loss) attributable to common stockholders	$ 25,038	$ 9,464
Denominator for earnings per share - basic and diluted:
Weighted average common shares outstanding	267,402	263,355
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights	(612)	(899)
Weighted average number of common shares outstanding — basic	266,790	262,456
Incremental shares issuable for assumed conversion of: Stock options and unvested restricted stock	(1,898)	(1,829)
Weighted average number of common shares outstanding — diluted	268,688	264,285
Net income/(loss) attributable to common stockholders	$ 0.09	$ 0.04
Net income/(loss) attributable to common stockholders	$ 0.09	$ 0.04
OP Units [Member]
Denominator for earnings per share - basic and diluted:
Antidilutive securities	24,962	25,191
Convertible Preferred Stock [Member]
Denominator for earnings per share - basic and diluted:
Antidilutive securities	3,028	3,028
Stock options and unvested restricted stock [Member]
Denominator for earnings per share - basic and diluted:
Antidilutive securities	1,898	1,829
RedeemableNoncontrollingInterest [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
(Income)/loss from continuing operations attributable to noncontrolling interest	$ (2,338)	$ (905)

XML

Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interest	$ 91	$ 306
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	904,778		$ 909,482
Net Income (Loss) Available to Common Stockholders, Basic	25,038	9,464
Long Term Incentive Plan Operating Partnership Unit Vesting, Value	2,317
Redeemable noncontrolling interests in the Operating Partnership
Mark to market adjustment to redeemable noncontrolling interests in the Operating Partnership	281
Conversion of Stock, Amount Issued	1,850
Adjustment for conversion of noncontrolling interest of unitholders in Operating Partnership	(1,850)	0
Net (income)/loss attributable to redeemable non-controlling interests in Operating Partnership	2,338	$ 905
Distributions to redeemable noncontrolling interests in the Operating Partnership	(7,919)
Redeemable non-controlling interests in operating partnership	904,778
Net income attributable to non-controlling interests	$ 101

XML

Related Party Transactions (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Limited partnership units owned	183,350,924		183,278,698
Related party management fees	$ 3,600	$ 3,600
United Dominion Reality L.P. [Member]
Related Party Transaction [Line Items]
Limited partnership units owned	183,240,041		183,167,815
Interest Expense, Related Party	$ 3,053	3,053
Notes payable due to General Partner	$ 273,334		$ 273,334
United Dominion Reality L.P. [Member] | Taxable REIT Subsidiaries [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Management Fee Percentage	2.75%
United Dominion Reality L.P. [Member] | UDR, Inc. [Member]
Related Party Transaction [Line Items]
General and administrative expenses allocated to the Operating Partnership by UDR	$ 4,500	$ 4,600
United Dominion Reality L.P. [Member] | UDR, Inc. [Member] | Bottom Dollar Guaranty [Member]
Related Party Transaction [Line Items]
Notes payable due to General Partner			$ 273,300
Note for 83.2 million [Member] | United Dominion Reality L.P. [Member] | UDR, Inc. [Member] | Guaranty Related To Community Acquisition [Member]
Related Party Transaction [Line Items]
Related party guaranty note payable interest rate	4.12%
Debt Instrument, Maturity Date Range, End	Aug. 31, 2021
Note for 5 million [Member] | United Dominion Reality L.P. [Member] | UDR, Inc. [Member] | Guaranty Related To Community Acquisition [Member]
Related Party Transaction [Line Items]
Related party guaranty note payable interest rate	5.34%
Debt Instrument, Maturity Date Range, End	Dec. 31, 2023
Note for 184.6 million [Member] | United Dominion Reality L.P. [Member] | UDR, Inc. [Member] | Guaranty Related To Community Acquisition [Member]
Related Party Transaction [Line Items]
Debt Instrument, Maturity Date Range, End	Apr. 01, 2026

XML

Fair Value of Derivatives and Financial Instruments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes receivable, net	$ 19,790,000	$ 19,790,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset	5,067,000	4,360,000
Derivative Liability	9,000	413,000
Secured debt instruments - variable rate
Borrowings outstanding	2,900,000	2,900,000
Unsecured debt instruments
Redeemable Noncontrolling Interest, Equity, Carrying Amount	904,778,000
Redeemable noncontrolling interests in the Operating Partnership (d)	904,778,000	909,482,000
Commercial Paper, at Carrying Value	220,000,000	0
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes receivable, net	19,790,000	19,790,000
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	24,857,000	24,150,000
Unsecured debt instruments
Total liabilities	3,552,485,000	3,418,079,000
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Liability		413,000
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Senior Unsecured Notes [Member] | Fair Value, Measurements, Recurring [Member]
Unsecured debt instruments
Unsecured debt instruments (c)	2,262,059,000	2,261,838,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Notes receivable (a)	19,735,000	19,645,000
Total assets	24,802,000	24,005,000
Unsecured debt instruments
Total liabilities	3,597,213,000	3,463,639,000
Redeemable noncontrolling interests in the Operating Partnership (d)	904,778,000	909,482,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivatives - Interest rate contracts	5,067,000	4,360,000
Derivatives - Interest rate contracts (b)	9,000	413,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	395,504,000	396,045,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - variable rate
Secured debt instruments - variable rate	94,700,000	94,700,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Paper Instruments Fair Value	220,000,000
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	365,391,000	365,693,000
Secured debt instruments - variable rate
Secured debt instruments - variable rate	182,606,000	280,946,000
Unsecured debt instruments
Unsecured debt instruments (c)	36,140,000	21,350,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Senior Unsecured Notes [Member] | Fair Value, Measurements, Recurring [Member]
Unsecured debt instruments
Unsecured debt instruments (c)	2,302,863,000	2,304,492,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Notes receivable (a)	0	0
Total assets	0	0
Unsecured debt instruments
Total liabilities	0	0
Redeemable noncontrolling interests in the Operating Partnership (d)	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivatives - Interest rate contracts	0	0
Derivatives - Interest rate contracts (b)	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Commercial bank [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Paper Instruments Fair Value	0
Unsecured debt instruments
Unsecured debt instruments (c)	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Senior Unsecured Notes [Member] | Fair Value, Measurements, Recurring [Member]
Unsecured debt instruments
Unsecured debt instruments (c)	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Notes receivable (a)	0	0
Total assets	5,067,000	4,360,000
Unsecured debt instruments
Total liabilities	9,000	413,000
Redeemable noncontrolling interests in the Operating Partnership (d)	904,778,000	909,482,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivatives - Interest rate contracts	5,067,000	4,360,000
Derivatives - Interest rate contracts (b)	9,000	413,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Commercial bank [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Paper Instruments Fair Value	0
Unsecured debt instruments
Unsecured debt instruments (c)	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Senior Unsecured Notes [Member] | Fair Value, Measurements, Recurring [Member]
Unsecured debt instruments
Unsecured debt instruments (c)	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Notes receivable (a)	19,735,000	19,645,000
Total assets	19,735,000	19,645,000
Unsecured debt instruments
Total liabilities	3,597,204,000	3,463,226,000
Redeemable noncontrolling interests in the Operating Partnership (d)	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivatives - Interest rate contracts	0	0
Derivatives - Interest rate contracts (b)	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	395,504,000	396,045,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - variable rate
Secured debt instruments - variable rate	94,700,000	94,700,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	365,391,000	365,693,000
Secured debt instruments - variable rate
Secured debt instruments - variable rate	182,606,000	280,946,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Commercial bank [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Paper Instruments Fair Value	220,000,000
Unsecured debt instruments
Unsecured debt instruments (c)	36,140,000	21,350,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Senior Unsecured Notes [Member] | Fair Value, Measurements, Recurring [Member]
Unsecured debt instruments
Unsecured debt instruments (c)	2,302,863,000	2,304,492,000
Unsecured Revolving Credit Facility due October 2015 [Member]
Secured debt instruments - variable rate
Borrowings outstanding	0	0
Variable Rate Debt [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured debt including debt on real estate held for sale	277,018,000	374,707,000
Variable Rate Debt [Member] | Tax Exempt Notes Payable [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured debt including debt on real estate held for sale	94,700,000	94,700,000
Variable Rate Debt [Member] | Line of Credit [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured debt including debt on real estate held for sale	182,606,000	280,946,000
Fixed Rate Debt [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured debt including debt on real estate held for sale	754,489,000	756,151,000
Fixed Rate Debt [Member] | Line of Credit [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured debt including debt on real estate held for sale	355,836,000	355,836,000
Fixed Rate Debt [Member] | Mortgages Notes Payable [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured debt including debt on real estate held for sale	$ 401,135,000	$ 402,996,000

XML

Fair Value of Derivatives and Financial Instruments (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
United Dominion Reality L.P. [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivatives - Interest rate contracts	$ 0	$ 1
Derivative Liability Designated as Hedging Instrument, Fair Value	0	0
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	24,857	24,150
Secured debt instruments - variable rate
Total liabilities	3,552,485	3,418,079
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets		1
Secured debt instruments - variable rate
Total liabilities	337,209	435,549
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivatives - Interest rate contracts		1
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - variable rate
Secured debt instruments - variable rate	27,000	27,000
Carrying (Reported) Amount, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	228,870	244,912
Secured debt instruments - variable rate
Secured debt instruments - variable rate	81,339	163,637
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	24,802	24,005
Secured debt instruments - variable rate
Total liabilities	3,597,213	3,463,639
Estimate of Fair Value, Fair Value Disclosure [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivatives - Interest rate contracts	5,067	4,360
Derivative Liability Designated as Hedging Instrument, Fair Value	9	413
Estimate of Fair Value, Fair Value Disclosure [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	395,504	396,045
Estimate of Fair Value, Fair Value Disclosure [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - variable rate
Secured debt instruments - variable rate	94,700	94,700
Estimate of Fair Value, Fair Value Disclosure [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	365,391	365,693
Secured debt instruments - variable rate
Secured debt instruments - variable rate	182,606	280,946
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	0	0
Secured debt instruments - variable rate
Total liabilities	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivatives - Interest rate contracts	0	0
Derivative Liability Designated as Hedging Instrument, Fair Value	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	5,067	4,360
Secured debt instruments - variable rate
Total liabilities	9	413
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivatives - Interest rate contracts	5,067	4,360
Derivative Liability Designated as Hedging Instrument, Fair Value	9	413
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	19,735	19,645
Secured debt instruments - variable rate
Total liabilities	3,597,204	3,463,226
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivatives - Interest rate contracts	0	0
Derivative Liability Designated as Hedging Instrument, Fair Value	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Mortgages Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	395,504	396,045
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - variable rate
Secured debt instruments - variable rate	94,700	94,700
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	365,391	365,693
Secured debt instruments - variable rate
Secured debt instruments - variable rate	182,606	280,946
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets		1
Secured debt instruments - variable rate
Total liabilities	343,498	442,301
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivatives - Interest rate contracts		1
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - variable rate
Secured debt instruments - variable rate	27,000	27,000
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	235,159	251,664
Secured debt instruments - variable rate
Secured debt instruments - variable rate	81,339	163,637
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets		0
Secured debt instruments - variable rate
Total liabilities	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 1 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivatives - Interest rate contracts		0
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 1 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 1 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets		1
Secured debt instruments - variable rate
Total liabilities	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 2 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivatives - Interest rate contracts		1
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 2 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 2 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets		0
Secured debt instruments - variable rate
Total liabilities	343,498	442,301
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 3 [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivatives - Interest rate contracts		0
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 3 [Member] | Tax Exempt Notes Payable [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - variable rate
Secured debt instruments - variable rate	27,000	27,000
Estimate of Fair Value, Fair Value Disclosure [Member] | United Dominion Reality L.P. [Member] | Level 3 [Member] | Line of Credit [Member] | Fair Value, Measurements, Recurring [Member]
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	235,159	251,664
Secured debt instruments - variable rate
Secured debt instruments - variable rate	$ 81,339	$ 163,637

XML

Derivatives and Hedging Activity (Details) $ in Thousands	Mar. 31, 2017 USD ($) instruments
Designated as Hedging Instrument [Member] | Interest rate swaps [Member]
Derivative [Line Items]
Number instruments	4
Notional	$ 315,000
Designated as Hedging Instrument [Member] | Interest rate caps [Member]
Derivative [Line Items]
Number instruments	2
Notional	$ 203,166
Not Designated as Hedging Instrument [Member] | Interest rate caps [Member]
Derivative [Line Items]
Number instruments | instruments	3
Notional	$ 133,107

XML

Derivatives and Hedging Activity (Details 1) $ in Thousands	Mar. 31, 2017 USD ($) instruments	Dec. 31, 2016 USD ($)
Interest Rate Products [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet
Derivative Asset Designated as Hedging Instrument, Fair Value	$ 5,067	$ 4,359
Interest Rate Products [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet
Derivative Asset Not Designated as Hedging Instrument, Fair Value	0	1
Interest Rate Products [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet
Derivative Liability Designated as Hedging Instrument, Fair Value	9	413
Interest Rate Products [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet
Derivative Liability Not Designated as Hedging Instrument, Fair Value	$ 0	$ 0
Interest rate caps [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Number of Interest Rate Derivatives Held	2
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet
Notional	$ 203,166
Interest rate caps [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Number of Interest Rate Derivatives Held | instruments	3
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet
Notional	$ 133,107

XML

Derivatives and Hedging Activity (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Effect of derivative instruments on the Consolidated Statements of Operations
Unrealized holding gain/(loss)	$ 632	$ (811)
Amount of Gain or (Loss) Recognized in Income on Derivative	(1)	0
Interest Rate Products [Member] | Interest Expense [Member] | Cash Flow Hedging [Member]
Effect of derivative instruments on the Consolidated Statements of Operations
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(764)	(935)
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	$ (54)	$ 0

XML

Derivatives and Hedging Activity (Details 3) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Offsetting Derivative Assets [Abstract]
Gross Amounts Offset in the Consolidated Balance Sheets	$ 0	$ 0
Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)	5,067	4,360
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	(5)	(221)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0	0
Net Amount	5,062	4,139
Offsetting Derivative Liabilities [Abstract]
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b)	9	413
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	(5)	(221)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0	0
Net Amount	$ 4	192
Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Interest Rate Contracts [Member]
Offsetting Derivative Liabilities [Abstract]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b)		$ 413

XML

Derivatives and Hedging Activity (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative, Collateral, Obligation to Return Cash	$ 0		$ 0
Derivatives And Hedging Activity (Textual) [Abstract]
Ineffectiveness on Interest Rate Fair Value Hedges is Immaterial	0
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense	$ 500,000
Derivative instruments not designated as hedging instruments, gain (loss), net	(1,000)	$ 0
Payment required to pay for contract termination	4,900,000
Other Income Expense [Member] | Interest Rate Contracts [Member]
Derivatives And Hedging Activity (Textual) [Abstract]
Derivative instruments not designated as hedging instruments, gain (loss), net	100,000	100,000
Cash Flow Hedging [Member] | Interest Expense [Member] | Interest Rate Contracts [Member]
Derivatives And Hedging Activity (Textual) [Abstract]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	54,000	0
Interest rate swaps [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional	315,000,000
United Dominion Reality L.P. [Member]
Derivatives, Fair Value [Line Items]
Derivative, Collateral, Obligation to Return Cash	$ 0		$ 0
Derivatives And Hedging Activity (Textual) [Abstract]
Ineffectiveness on Interest Rate Fair Value Hedges is Immaterial	0
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense	$ 100,000
Derivative instruments not designated as hedging instruments, gain (loss), net	100,000	0
Fair value of derivatives in a net liability position	0
United Dominion Reality L.P. [Member] | Other Income Expense [Member] | Interest Rate Contracts [Member]
Derivatives And Hedging Activity (Textual) [Abstract]
Derivative instruments not designated as hedging instruments, gain (loss), net	(1,000)	0
United Dominion Reality L.P. [Member] | Cash Flow Hedging [Member] | Interest Expense [Member] | Interest Rate Contracts [Member]
Derivatives And Hedging Activity (Textual) [Abstract]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ 54,000	$ 0

XML

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands	Mar. 31, 2017 USD ($) instruments
Designated as Hedging Instrument [Member] | Interest rate swaps [Member]
Derivative [Line Items]
Number instruments	4
Outstanding interest rate derivatives not designated as hedging instrument
Notional	$ 315,000
Designated as Hedging Instrument [Member] | Interest rate caps [Member]
Derivative [Line Items]
Number instruments	2
Outstanding interest rate derivatives not designated as hedging instrument
Notional	$ 203,166
Not Designated as Hedging Instrument [Member] | Interest rate caps [Member]
Derivative [Line Items]
Number instruments | instruments	3
Outstanding interest rate derivatives not designated as hedging instrument
Notional	$ 133,107
United Dominion Reality L.P. [Member] | Designated as Hedging Instrument [Member] | Interest rate caps [Member]
Derivative [Line Items]
Number instruments	1
Outstanding interest rate derivatives not designated as hedging instrument
Notional	$ 82,494
United Dominion Reality L.P. [Member] | Not Designated as Hedging Instrument [Member] | Interest rate caps [Member]
Derivative [Line Items]
Number instruments | instruments	3
Outstanding interest rate derivatives not designated as hedging instrument
Notional	$ 87,580

XML

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 1) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Interest Rate Products [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset Designated as Hedging Instrument, Fair Value	$ 5,067	$ 4,359
Interest Rate Products [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset Not Designated as Hedging Instrument, Fair Value	0	1
Interest Rate Products [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Liability Designated as Hedging Instrument, Fair Value	9	413
Interest Rate Products [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Liability Not Designated as Hedging Instrument, Fair Value	0	0
United Dominion Reality L.P. [Member]
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset Designated as Hedging Instrument, Fair Value	0	1
Derivative Liability Designated as Hedging Instrument, Fair Value	0	0
United Dominion Reality L.P. [Member] | Interest Rate Products [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset Designated as Hedging Instrument, Fair Value	0	0
United Dominion Reality L.P. [Member] | Interest Rate Products [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset Not Designated as Hedging Instrument, Fair Value	0	1
United Dominion Reality L.P. [Member] | Interest Rate Products [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Liability Designated as Hedging Instrument, Fair Value	0	0
United Dominion Reality L.P. [Member] | Interest Rate Products [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Liability Not Designated as Hedging Instrument, Fair Value	$ 0	$ 0

XML

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 2) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized holding gain/(loss)	$ 632,000	$ (811,000)
Amount of Gain or (Loss) Recognized in Income on Derivative	(1,000)	0
Interest Rate Products [Member] | Other Income Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	100,000	100,000
Interest Rate Products [Member] | Interest Expense [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(764,000)	(935,000)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	(54,000)	0
United Dominion Reality L.P. [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized holding gain/(loss)	0	(2,000)
Amount of Gain or (Loss) Recognized in Income on Derivative	100,000	0
United Dominion Reality L.P. [Member] | Interest Rate Products [Member] | Other Income Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	(1,000)	0
United Dominion Reality L.P. [Member] | Interest Rate Products [Member] | Interest Expense [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	0	(1,000)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ (54,000)	$ 0

XML

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 3) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Offsetting Derivative Assets [Abstract]
Gross Amounts Offset in the Consolidated Balance Sheets	$ 0	$ 0
Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)	5,067	4,360
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	5	221
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0	0
Net Amount	5,062	4,139
Offsetting Derivative Liabilities [Abstract]
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b)	9	413
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	5	221
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0	0
Net Amount	4	192
United Dominion Reality L.P. [Member]
Offsetting Derivative Assets [Abstract]
Derivative Asset Designated as Hedging Instrument, Fair Value	0	1
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)	0	1
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0	0
Net Amount	0	1
Offsetting Derivative Liabilities [Abstract]
Derivative Liability Designated as Hedging Instrument, Fair Value	0	0
Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b)	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0	0
Net Amount	$ 0	$ 0

XML

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Entity Information [Line Items]
Ineffectiveness on Interest Rate Fair Value Hedges is Immaterial	0
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense	$ 500,000
Losses in the fair value of derivatives not designated in hedging relationships	1,000	$ 0
Payment required to pay for contract termination	4,900,000
Derivative, Collateral, Obligation to Return Cash	$ 0		$ 0
United Dominion Reality L.P. [Member]
Entity Information [Line Items]
Ineffectiveness on Interest Rate Fair Value Hedges is Immaterial	0
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense	$ 100,000
Losses in the fair value of derivatives not designated in hedging relationships	(100,000)	0
Fair value of derivatives in a net liability position	0
Derivative, Collateral, Obligation to Return Cash	0		$ 0
Interest Expense [Member] | Interest Rate Contracts [Member] | Cash Flow Hedging [Member]
Entity Information [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	54,000	0
Interest Expense [Member] | Interest Rate Contracts [Member] | Cash Flow Hedging [Member] | United Dominion Reality L.P. [Member]
Entity Information [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ 54,000	$ 0

XML

Stock Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Stock Based Compensation (Textual) [Abstract]
Stock based compensation expense	$ 3.4	$ 3.9

XML

Capital Structure (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) $ / Units shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2014 shares
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	183,350,924	183,278,698
Long Term Incentive Plan Operating Partnership Units Vesting, Shares	72,226
Partners' Capital Account, Units, Redeemed	0
Redeemable Noncontrolling Interest, Equity, Carrying Amount | $	$ 904,778
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership | $	$ 904,778	$ 909,482
United Dominion Reality L.P. [Member]
Limited Partners' Capital Account [Line Items]
General Partnership units outstanding	110,883	110,883
Limited partnership units owned	183,240,041	183,167,815
Limited Partners' Capital Account, Required Period To Be Outstanding Before Unit is Redeemable	1 year
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership | $	$ 330,600	$ 330,100
UDR, Inc. [Member]
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	174,122,808	174,119,201
Percentage of units	95.00%	95.10%
Class A Limited Partner [Member]
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	1,751,671
Cumulative, annual, non-compounded preferred return on Class A Partnership units	8.00%
Value of Class A Partnership units (in dollars per unit) | $ / Units	16.61
Class A Limited Partner [Member] | United Dominion Reality L.P. [Member]
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	1,873,332
Class A Limited Partner [Member] | UDR, Inc. [Member]
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	121,661	121,661	121,661
Non-affiliated Partners [Member]
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	7,365,562	7,296,943
Long Term Incentive Plan Operating Partnership Units Vesting, Shares	72,226
Partners' Capital Account, Units, Redeemed	(3,607)
Non-affiliated Partners [Member] | United Dominion Reality L.P. [Member]
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	9,117,233	9,048,614
Percentage of units	5.00%	4.90%
Non-affiliated Partners [Member] | Class A Limited Partner [Member]
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	1,751,671	1,751,671
Long Term Incentive Plan Operating Partnership Units Vesting, Shares	0
Partners' Capital Account, Units, Redeemed	0
Limited Partner [Member] | United Dominion Reality L.P. [Member]
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	174,233,691
Percentage of units	95.00%
Limited Partner [Member] | UDR, Inc. [Member]
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	174,001,147	173,997,540
Long Term Incentive Plan Operating Partnership Units Vesting, Shares	0
Partners' Capital Account, Units, Redeemed	3,607
General Partner [Member] | UDR, Inc. [Member]
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	110,883	110,883
Long Term Incentive Plan Operating Partnership Units Vesting, Shares	0
Partners' Capital Account, Units, Redeemed	0
Class A Limited Partner [Member] | UDR, Inc. [Member]
Limited Partners' Capital Account [Line Items]
Partners' Capital Account, Units, Redeemed	0

XML

Commitments and Contingencies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Communities	Mar. 31, 2016 USD ($)
Real Estate Properties [Line Items]
Development costs and capital expenditures incurred but not yet paid	$ 34,336	$ 21,220
Number of communities owned (in communities) | Communities	128
Costs Incurred to Date	$ 1,255,013
Expected Costs to Complete	386,989
Wholly owned — under development [Member]
Real Estate Properties [Line Items]
Development costs and capital expenditures incurred but not yet paid	$ 25,300
Number of communities owned (in communities)	2
Costs Incurred to Date	$ 393,837
Expected Costs to Complete	$ 314,663
Average Ownership Stake	100.00%
Wholly owned — redevelopment [Member]
Real Estate Properties [Line Items]
Development costs and capital expenditures incurred but not yet paid	$ 700
Number of communities owned (in communities)	1
Costs Incurred to Date	$ 3,699
Expected Costs to Complete	$ 5,801
Average Ownership Stake	100.00%
Unconsolidated joint ventures [Member]
Real Estate Properties [Line Items]
Number of communities owned (in communities)	6
Costs Incurred to Date	$ 721,462
Expected Costs to Complete	$ 66,525
Average Ownership Stake	50.00%
Participating Loan Investment Steele Creek Denver Colorado [Member]
Real Estate Properties [Line Items]
Number of communities owned (in communities)	1
Costs Incurred to Date	$ 94,002
Expected Costs to Complete	$ 0
Average Ownership Stake	0.00%
Preferred Equity Investment West Coast Development JV [Member]
Real Estate Properties [Line Items]
Number of communities owned (in communities)	2
Costs Incurred to Date	$ 42,013
Expected Costs to Complete	$ 0
Average Ownership Stake	49.00%

XML

Commitments and Contingencies (UNITED DOMINION REALTY, L.P.) Commitments and Contingencies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Communities	Mar. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Development costs and capital expenditures incurred but not yet paid	$ 34,336	$ 21,220
Number of communities owned (in communities) | Communities	128
Cost Incurred to Date	$ 1,255,013
Expected Costs to Complete	386,989
United Dominion Reality L.P. [Member]
Loss Contingencies [Line Items]
Development costs and capital expenditures incurred but not yet paid	$ 4,816	$ 4,505
Number of communities owned (in communities) | Communities	54
Wholly owned — redevelopment [Member]
Loss Contingencies [Line Items]
Development costs and capital expenditures incurred but not yet paid	$ 700
Number of communities owned (in communities)	1
Cost Incurred to Date	$ 3,699
Expected Costs to Complete	5,801
Wholly owned — under development [Member]
Loss Contingencies [Line Items]
Development costs and capital expenditures incurred but not yet paid	$ 25,300
Number of communities owned (in communities)	2
Cost Incurred to Date	$ 393,837
Expected Costs to Complete	$ 314,663

XML

Reportable Segments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Segments	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Same Store Communities	35,689
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment NOI	$ 171,483	$ 164,134
Reconciling items:
Joint venture management and other fees	2,570	2,858
Property management	(6,635)	(6,379)
Other operating expenses	(1,691)	(1,752)
Segment Reporting Reconciling Items Cost of Services Depreciation and Amortization	(105,032)	(105,339)
General and administrative	(13,075)	(13,844)
Casualty-related (recoveries)/charges, net	(502)	0
Other depreciation and amortization	(1,608)	(1,553)
Income/(loss) from unconsolidated entities	11,198	679
Interest expense	30,539	31,104
Interest and other income/(expense), net	427	431
Tax benefit, net	(332)	403
Gain Loss on the Sale of Real Estate, Including Discontinued Operations	2,132	3,070
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(2,338)	(905)
Net (income)/loss attributable to noncontrolling interests	(91)	(306)
Net income/(loss) attributable to UDR, Inc.	25,967	10,393
Reportable apartment home segment assets:
Total segment assets	9,787,569		$ 9,615,753
Accumulated depreciation	(3,026,660)		(2,923,625)
Total segment asset - net book value	6,760,909		6,692,128
Reconciling items:
Cash and cash equivalents	2,460	$ 3,668	2,112	$ 6,742
Restricted cash	19,757		19,994
Notes receivable, net	19,790		19,790
Investments in and advances to unconsolidated joint ventures, net	818,990		827,025
Other assets	114,005		118,535
Total consolidated assets	$ 7,735,911		7,679,584
Reportable Segment (Textual) [Abstract]
Number of reportable segments | Segments	2
Condition for Community considered to have stabilized occupancy	0.9
Number of Tenants or related group of tenants that contributed 10% or more of company total revenue	0	0
Same Communities [Member]
Reportable Segment (Textual) [Abstract]
SEC Schedule III, Real Estate, Improvements	$ 15,300	$ 12,900
Same Store Communities Western Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	82,220	78,409
Reportable apartment home segment NOI	61,895	59,146
Reportable apartment home segment assets:
Total segment assets	2,944,437		2,938,073
Same Store Communities Mid-Atlantic Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	52,109	50,154
Reportable apartment home segment NOI	36,315	33,729
Reportable apartment home segment assets:
Total segment assets	2,221,312		2,216,067
Same Store Communities Northeast Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	37,921	36,460
Reportable apartment home segment NOI	26,901	26,360
Reportable apartment home segment assets:
Total segment assets	1,858,432		1,857,193
Same Store Communities Southeastern Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	28,657	27,137
Reportable apartment home segment NOI	19,661	18,797
Reportable apartment home segment assets:
Total segment assets	750,147		746,762
Same Store Communities Southwestern Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	10,679	10,125
Reportable apartment home segment NOI	6,678	6,331
Reportable apartment home segment assets:
Total segment assets	283,979		283,260
Non-Mature communities/Other [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	29,685	29,672
Reportable apartment home segment NOI	20,033	19,771
Reportable apartment home segment assets:
Total segment assets	1,729,262		1,574,398
Reportable Segment (Textual) [Abstract]
SEC Schedule III, Real Estate, Improvements	800	2,700
Total Communities [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	$ 241,271	231,957
United Dominion Reality L.P. [Member]
Segment Reporting Information [Line Items]
Same Store Communities	15,058
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment NOI	$ 75,063	72,552
Reconciling items:
Property management	(2,822)	(2,717)
Other operating expenses	(1,548)	(1,500)
Segment Reporting Reconciling Items Cost of Services Depreciation and Amortization	(36,879)	(36,791)
General and administrative	(5,219)	(5,421)
Casualty-related (recoveries)/charges, net	(553)	0
Income/(loss) from unconsolidated entities	(5,424)	(13,387)
Interest expense	8,611	7,605
Net (income)/loss attributable to noncontrolling interests	(350)	(344)
Net income/(loss) attributable to UDR, Inc.	13,657	4,787
Reportable apartment home segment assets:
Total segment assets	3,686,334		3,674,704
Accumulated depreciation	(1,445,528)
Total segment asset - net book value	2,240,806		2,265,889
Reconciling items:
Cash and cash equivalents	864	$ 1,102	756	$ 3,103
Restricted cash	12,141		11,694
Other assets	21,475		24,329
Total consolidated assets	$ 2,378,553		2,415,535
Reportable Segment (Textual) [Abstract]
Number of reportable segments | Segments	2
Number of Tenants or related group of tenants that contributed 10% or more of company total revenue	0	0
United Dominion Reality L.P. [Member] | Same-Store [Member]
Reportable Segment (Textual) [Abstract]
SEC Schedule III, Real Estate, Improvements	$ 8,000	$ 5,300
United Dominion Reality L.P. [Member] | Same Store Communities Western Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	50,482	47,636
Reportable apartment home segment NOI	38,445	36,159
Reportable apartment home segment assets:
Total segment assets	1,601,136		1,596,815
United Dominion Reality L.P. [Member] | Same Store Communities Mid-Atlantic Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	14,748	14,167
Reportable apartment home segment NOI	10,095	9,362
Reportable apartment home segment assets:
Total segment assets	656,850		655,693
United Dominion Reality L.P. [Member] | Same Store Communities Northeast Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	13,559	13,006
Reportable apartment home segment NOI	10,131	10,057
Reportable apartment home segment assets:
Total segment assets	675,407		674,928
United Dominion Reality L.P. [Member] | Same Store Communities Southeastern Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	12,271	11,696
Reportable apartment home segment NOI	8,283	8,043
Reportable apartment home segment assets:
Total segment assets	330,214		328,729
United Dominion Reality L.P. [Member] | Non-Mature communities/Other [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	11,545	12,281
Reportable apartment home segment NOI	8,109	8,931
Reportable apartment home segment assets:
Total segment assets	422,727		$ 418,539
Reportable Segment (Textual) [Abstract]
SEC Schedule III, Real Estate, Improvements	400	300
United Dominion Reality L.P. [Member] | Total Communities [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	$ 102,605	$ 98,786
Taxable REIT Subsidiaries [Member] | United Dominion Reality L.P. [Member]
Reportable Segment (Textual) [Abstract]
Related Party Transaction, Management Fee Percentage	2.75%

XML

Reportable Segments (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Segments	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Equity Method Investments	$ 818,990		$ 827,025
Same Store Communities	35,689
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment NOI	$ (171,483)	$ (164,134)
Reconciling items:
Property management	(6,635)	(6,379)
Other operating expenses	(1,691)	(1,752)
General and administrative	(13,075)	(13,844)
Casualty-related (recoveries)/charges, net	(502)	0
Income/(loss) from unconsolidated entities	11,198	679
Interest expense	30,539	31,104
Net (income)/loss attributable to noncontrolling interests	(91)	(306)
Net income/(loss) attributable to OP unitholders	25,967	10,393
Reportable apartment home segment assets:
Total segment assets	9,787,569		9,615,753
Real Estate Investment Property, Accumulated Depreciation	3,026,660		2,923,072
Accumulated depreciation	(3,026,660)		(2,923,625)
Total segment asset - net book value	6,760,909		6,692,128
Reconciling items:
Cash and cash equivalents	2,460	$ 3,668	2,112	$ 6,742
Restricted cash	19,757		19,994
Other assets	114,005		118,535
Total assets	$ 7,735,911		7,679,584
Reportable Segment (Textual) [Abstract]
Number of reportable segments | Segments	2
Condition for Community considered to have stabilized occupancy	0.9
Time to maintain percent occupancy to be considered a community	3 months	3 months
Number of Tenants or related group of tenants that contributed 10% or more of company total revenue	0	0
Same Store Communities Western Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	$ 82,220	$ 78,409
Reportable apartment home segment NOI	(61,895)	(59,146)
Reportable apartment home segment assets:
Total segment assets	2,944,437		2,938,073
Same Store Communities Mid-Atlantic Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	52,109	50,154
Reportable apartment home segment NOI	(36,315)	(33,729)
Reportable apartment home segment assets:
Total segment assets	2,221,312		2,216,067
Same Store Communities Northeast Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	37,921	36,460
Reportable apartment home segment NOI	(26,901)	(26,360)
Reportable apartment home segment assets:
Total segment assets	1,858,432		1,857,193
Same Store Communities Southeastern Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	28,657	27,137
Reportable apartment home segment NOI	(19,661)	(18,797)
Reportable apartment home segment assets:
Total segment assets	750,147		746,762
Same Store Communities Southwestern Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	10,679	10,125
Reportable apartment home segment NOI	(6,678)	(6,331)
Reportable apartment home segment assets:
Total segment assets	283,979		283,260
Non-Mature communities/Other [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	29,685	29,672
Reportable apartment home segment NOI	(20,033)	(19,771)
Reportable apartment home segment assets:
Total segment assets	1,729,262		1,574,398
Reportable Segment (Textual) [Abstract]
SEC Schedule III, Real Estate, Improvements	800	2,700
Total Communities [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	241,271	231,957
United Dominion Reality L.P. [Member]
Segment Reporting Information [Line Items]
Equity Method Investments	$ 103,267		112,867
Same Store Communities	15,058
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment NOI	$ (75,063)	(72,552)
Reconciling items:
Property management	(2,822)	(2,717)
Other operating expenses	(1,548)	(1,500)
General and administrative	(5,219)	(5,421)
Casualty-related (recoveries)/charges, net	(553)	0
Income/(loss) from unconsolidated entities	(5,424)	(13,387)
Interest expense	8,611	7,605
Net (income)/loss attributable to noncontrolling interests	(350)	(344)
Net income/(loss) attributable to OP unitholders	13,657	4,787
Reportable apartment home segment assets:
Total segment assets	3,686,334		3,674,704
Real Estate Investment Property, Accumulated Depreciation	1,445,528		1,408,815
Accumulated depreciation	(1,445,528)
Total segment asset - net book value	2,240,806		2,265,889
Reconciling items:
Cash and cash equivalents	864	$ 1,102	756	$ 3,103
Restricted cash	12,141		11,694
Other assets	21,475		24,329
Total assets	$ 2,378,553		2,415,535
Reportable Segment (Textual) [Abstract]
Number of reportable segments | Segments	2
Number of Tenants or related group of tenants that contributed 10% or more of company total revenue	0	0
United Dominion Reality L.P. [Member] | Same-Store [Member]
Reportable Segment (Textual) [Abstract]
SEC Schedule III, Real Estate, Improvements	$ 8,000	$ 5,300
United Dominion Reality L.P. [Member] | Same Store Communities Western Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	50,482	47,636
Reportable apartment home segment NOI	(38,445)	(36,159)
Reportable apartment home segment assets:
Total segment assets	1,601,136		1,596,815
United Dominion Reality L.P. [Member] | Same Store Communities Mid-Atlantic Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	14,748	14,167
Reportable apartment home segment NOI	(10,095)	(9,362)
Reportable apartment home segment assets:
Total segment assets	656,850		655,693
United Dominion Reality L.P. [Member] | Same Store Communities Northeast Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	13,559	13,006
Reportable apartment home segment NOI	(10,131)	(10,057)
Reportable apartment home segment assets:
Total segment assets	675,407		674,928
United Dominion Reality L.P. [Member] | Same Store Communities Southeastern Region [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	12,271	11,696
Reportable apartment home segment NOI	(8,283)	(8,043)
Reportable apartment home segment assets:
Total segment assets	330,214		328,729
United Dominion Reality L.P. [Member] | Non-Mature communities/Other [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	11,545	12,281
Reportable apartment home segment NOI	(8,109)	(8,931)
Reportable apartment home segment assets:
Total segment assets	422,727		$ 418,539
Reportable Segment (Textual) [Abstract]
SEC Schedule III, Real Estate, Improvements	400	300
United Dominion Reality L.P. [Member] | Total Communities [Member]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations
Reportable apartment home segment rental income	$ 102,605	$ 98,786