10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

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

For the quarterly period ended September 30, 2016

OR

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

Commission File Number 1-9317

EQUITY COMMONWEALTH

(Exact Name of Registrant as Specified in Its Charter)

Maryland	04-6558834
(State or Other Jurisdiction of Incorporation or Organization)	(IRS Employer Identification No.)

Two North Riverside Plaza, Suite 2100, Chicago, IL	60606
(Address of Principal Executive Offices)	(Zip Code)

(312) 646-2800

(Registrant’s Telephone Number, Including Area Code)

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

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

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

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

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

Number of registrant’s common shares of beneficial interest, $0.01 par value per share, outstanding as of October 27, 2016:  125,532,523.

EQUITY COMMONWEALTH

FORM 10-Q

September 30, 2016

INDEX

		Page
PART I	Financial Information
Item 1.	Financial Statements (unaudited)
	Condensed Consolidated Balance Sheets	1
	Condensed Consolidated Statements of Operations	2
	Condensed Consolidated Statements of Comprehensive Income	3
	Condensed Consolidated Statements of Cash Flows	4
	Notes to Condensed Consolidated Financial Statements	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	20
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	35
Item 4.	Controls and Procedures	37
PART II	Other Information
Item 1.	Legal Proceedings	38
Item 1A.	Risk Factors	38
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	38
Item 3.	Defaults Upon Senior Securities	38
Item 4.	Mine Safety Disclosures	38
Item 5.	Other Information	38
Item 6.	Exhibits	39
	Signatures	40

EXPLANATORY NOTE

References in this Quarterly Report on Form 10-Q to the Company, EQC, we, us or our, refer to Equity Commonwealth and its consolidated subsidiaries as of September 30, 2016, unless the context indicates otherwise.

i

PART I.Financial Information

Item 1.Financial Statements.

EQUITY COMMONWEALTH

CONDENSED CONSOLIDATED BALANCE SHEETS

(amounts in thousands, except share data)

(unaudited)

	September 30, 2016			December 31, 2015
				(audited)
ASSETS
Real estate properties:
Land	$	293,225		$	389,410
Buildings and improvements	2,642,588			3,497,942
	2,935,813			3,887,352
Accumulated depreciation	(751,882		)	(898,939		)
	2,183,931			2,988,413
Properties held for sale	13,463			—
Acquired real estate leases, net	52,017			88,760
Cash and cash equivalents	2,405,174			1,802,729
Restricted cash	36,755			32,245
Rents receivable, net of allowance for doubtful accounts of $4,515 and $7,715, respectively	150,728			174,676
Other assets, net	123,699			144,341
Total assets	$	4,965,767		$	5,231,164
LIABILITIES AND SHAREHOLDERS’ EQUITY
Senior unsecured debt, net	$	1,313,267		$	1,450,606
Mortgage notes payable, net	243,993			246,510
Liabilities related to properties held for sale	667			—
Accounts payable and accrued expenses	87,003			123,587
Assumed real estate lease obligations, net	2,140			4,296
Rent collected in advance	21,529			27,340
Security deposits	8,128			10,338
Total liabilities	1,676,727			1,862,677
Shareholders’ equity:
Preferred shares of beneficial interest, $0.01 par value: 50,000,000 shares authorized;
Series D preferred shares; 6 1/2% cumulative convertible; 4,915,196 shares issued and outstanding, aggregate liquidation preference of $122,880	119,263			119,263
Series E preferred shares; 7 1/4% cumulative redeemable on or after May 15, 2016; 0 and 11,000,000 shares issued and outstanding, respectively, aggregate liquidation preference $0 and $275,000, respectively	—			265,391
Common shares of beneficial interest, $0.01 par value: 350,000,000 shares authorized; 125,532,523 and 126,349,914 shares issued and outstanding, respectively	1,255			1,263
Additional paid in capital	4,402,927			4,414,611
Cumulative net income	2,554,343			2,333,709
Cumulative other comprehensive loss	(1,117		)	(3,687		)
Cumulative common distributions	(3,111,868		)	(3,111,868		)
Cumulative preferred distributions	(675,763		)	(650,195		)
Total shareholders’ equity	3,289,040			3,368,487
Total liabilities and shareholders’ equity	$	4,965,767		$	5,231,164

See accompanying notes.

1

EQUITY COMMONWEALTH

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(amounts in thousands, except per share data)

(unaudited)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Revenues:
Rental income	$	92,722		$	125,459		$	324,345		$	457,128
Tenant reimbursements and other income	21,910			33,749			72,789			118,829
Total revenues	114,632			159,208			397,134			575,957
Expenses:
Operating expenses	49,313			73,571			157,964			261,128
Depreciation and amortization	29,184			40,522			102,766			156,858
General and administrative	13,277			16,249			38,766			43,718
Loss on asset impairment	—			—			43,736			17,162
Total expenses	91,774			130,342			343,232			478,866
Operating income	22,858			28,866			53,902			97,091
Interest and other income	3,013			637			7,184			4,813
Interest expense (including net amortization of debt discounts, premiums and deferred financing fees of $948, $171, $2,880 and $23, respectively)	(21,427		)	(25,111		)	(65,074		)	(82,926		)
(Loss) gain on early extinguishment of debt	—			(3,887		)	(118		)	6,111
Foreign currency exchange loss	—			(9,809		)	(5		)	(8,953		)
Gain on sale of properties	82,169			39,793			225,210			42,953
Income before income taxes	86,613			30,489			221,099			59,089
Income tax expense	(225		)	(23		)	(465		)	(2,377		)
Net income	86,388			30,466			220,634			56,712
Preferred distributions	(1,997		)	(6,981		)	(15,959		)	(20,943		)
Excess fair value of consideration paid over carrying value of preferred shares	—			—			(9,609		)	—
Net income attributable to Equity Commonwealth common shareholders	$	84,391		$	23,485		$	195,066		$	35,769
Weighted average common shares outstanding — basic	125,533			128,739			125,627			129,386
Weighted average common shares outstanding — diluted	126,568			129,878			127,009			130,093
Earnings per common share attributable to Equity Commonwealth common shareholders:
Basic	$	0.67		$	0.18		$	1.55		$	0.28
Diluted	$	0.67		$	0.18		$	1.54		$	0.27

See accompanying notes.

2

EQUITY COMMONWEALTH

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(amounts in thousands)

(unaudited)

	Three Months Ended   September 30,				Nine Months Ended   September 30,
	2016		2015		2016		2015
Net income	$	86,388	$	30,466	$	220,634	$	56,712
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on derivative instruments and other assets	1,117		821		2,570		(843		)
Foreign currency translation adjustments	—		—		—		48,917
Total comprehensive income	$	87,505	$	31,287	$	223,204	$	104,786

See accompanying notes.

3

EQUITY COMMONWEALTH

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(amounts in thousands)

(unaudited)

	Nine Months Ended September 30,
	2016			2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	220,634		$	56,712
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	79,128			117,239
Net amortization of debt discounts, premiums and deferred financing fees	2,880			23
Straight line rental income	(12,384		)	(3,512		)
Amortization of acquired real estate leases	18,289			28,386
Other amortization	11,219			17,224
Share-based compensation	13,871			11,765
Loss on asset impairment	43,736			17,162
Loss (gain) on early extinguishment of debt	118			(6,111		)
Foreign currency exchange loss	5			8,953
Net gain on sale of properties	(225,210		)	(42,953		)
Change in assets and liabilities:
Restricted cash	(6,119		)	(6,275		)
Rents receivable and other assets	(20,474		)	(46,607		)
Accounts payable and accrued expenses	(5,303		)	(5,769		)
Rent collected in advance	(3,912		)	(6,112		)
Security deposits	234			1,298
Cash provided by operating activities	116,712			141,423
CASH FLOWS FROM INVESTING ACTIVITIES:
Real estate improvements	(92,106		)	(43,396		)
Principal payments received from direct financing lease	—			5,717
Proceeds from sale of properties, net	1,034,403			1,425,590
Proceeds from sale of securities	—			27,068
Decrease (increase) in restricted cash	1,609			(3,238		)
Cash provided by investing activities	943,906			1,411,741
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase and retirement of common shares	(25,563		)	(87,983		)
Redemption of preferred shares	(275,000		)	—
Payments on borrowings	(141,591		)	(142,868		)
Deferred financing fees	(52		)	(7,143		)
Distributions to preferred shareholders	(15,959		)	(20,943		)
Cash used in financing activities	(458,165		)	(258,937		)
Effect of exchange rate changes on cash	(8		)	(9,581		)
Increase in cash and cash equivalents	602,445			1,284,646
Cash and cash equivalents at beginning of period	1,802,729			364,516
Cash and cash equivalents at end of period	$	2,405,174		$	1,649,162

See accompanying notes.

4

EQUITY COMMONWEALTH

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (CONTINUED)

(amounts in thousands)

(unaudited)

	Nine Months Ended September 30,
	2016		2015
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	$	69,373	$	93,598
Taxes paid	103		5,853
NON-CASH INVESTING ACTIVITIES:
Increase (decrease) in capital expenditures recorded as liabilities	$	3,191	$	(9,753	)

See accompanying notes.

5

EQUITY COMMONWEALTH

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Note 1.  Basis of Presentation

The accompanying condensed consolidated financial statements of EQC have been prepared without audit.  Certain information and footnote disclosures required by U.S. generally accepted accounting principles, or GAAP, for complete financial statements have been condensed or omitted.  We believe the disclosures made are adequate to make the information presented not misleading.  However, the accompanying condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes contained in our Annual Report on Form 10-K (Annual Report) for the year ended December 31, 2015.  Capitalized terms used, but not defined in this Quarterly Report, have the same meanings as in our Annual Report.

In the opinion of our management, all adjustments, which include only normal recurring adjustments considered necessary for a fair presentation, have been included.  All intercompany transactions and balances with or among our subsidiaries have been eliminated.  Operating results for interim periods are not necessarily indicative of the results that may be expected for the full year.  Reclassifications have been made to the prior years’ financial statements to conform to the current year’s presentation.

The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect reported amounts.  Actual results could differ from those estimates.  Significant estimates in the condensed consolidated financial statements include the allowance for doubtful accounts, purchase price allocations, useful lives of fixed assets and impairment of real estate and intangible assets.

Share amounts are presented in whole numbers, except where noted.

Note 2.  Recent Accounting Pronouncements

In August 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. This update is effective for fiscal years beginning after December 15, 2017, and for interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. We are currently in the process of evaluating the impact, if any, the adoption of this ASU will have on our condensed consolidated financial statements.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which requires more timely recognition of credit losses associated with financial assets. This update is effective for fiscal years beginning after December 15, 2019, and for interim periods within those fiscal years. Early adoption is permitted for fiscal years, and interim periods within those years, beginning after December 15, 2018. We are currently in the process of evaluating the impact, if any, the adoption of this ASU will have on our condensed consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which simplifies several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. This update is effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods, but early adoption is permitted. We are currently in the process of evaluating the impact the adoption of this ASU will have on our condensed consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases, which amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets. The ASU also requires lessees or lessors to capitalize only initial direct costs of leases. This update is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, but early adoption is permitted. We are currently in the process of evaluating the impact the adoption of this ASU will have on our condensed consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which provides guidance for revenue recognition. This update is effective for interim and annual reporting periods beginning after December 15, 2017.  We

6

EQUITY COMMONWEALTH

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

are currently in the process of evaluating the impact, if any, the adoption of this ASU will have on our condensed consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs. This standard amends existing guidance to require the presentation of debt issuance costs in the balance sheet as a deduction from the carrying amount of the related debt liability instead of as a deferred charge. It is effective for annual reporting periods beginning after December 15, 2015, but early adoption is permitted. We adopted this standard on January 1, 2016 and made the following reclassifications to the prior years' consolidated balance sheet to conform to the current year's presentation (in thousands):

Balance Sheet as of December 31, 2015	Originally Reported	Effect of Change		As Adjusted
Other assets, net	157,549	(13,208	)	144,341
Senior unsecured debt, net	1,460,592	(9,986	)	1,450,606
Mortgage notes payable, net	249,732	(3,222	)	246,510

In April 2014, the FASB issued ASU No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, or ASU 2014-08.  ASU 2014-08 changes the criteria for reporting a discontinued operation.  Under the new pronouncement, a disposal of a part of an organization that has a major effect on its operations and financial results is a discontinued operation.  We adopted ASU 2014-08 on January 1, 2015, and determined that our 2016 dispositions, 2015 dispositions and properties held for sale as of September 30, 2016 do not individually represent a strategic shift, as defined by the standard, that has or will have a major effect on our operations and financial results. As a result, the 2016 and 2015 dispositions and properties held for sale have not been presented as discontinued operations in the statements of operations.

Note 3.  Real Estate Properties

During the nine months ended September 30, 2016 and 2015, we made improvements, excluding tenant-funded improvements, to our properties totaling $88.5 million and $46.7 million, respectively.

Properties Held For Sale:

We classify all properties that meet the criteria outlined in the Property, Plant and Equipment Topic of the FASB Accounting Standards Codification (Codification) as held for sale on our condensed consolidated balance sheets.  As of December 31, 2015, we had no properties classified as held for sale. As of September 30, 2016, we classified the following property as held for sale (dollars in thousands):

Asset	Date Sold	Number of Properties	Number of Buildings	Square Footage	Gross Sales Price
7800 Shoal Creek Boulevard	October 2016	1	4	151,917	$	29,210

Summarized balance sheet information for the property classified as held for sale is as follows (in thousands):

	September 30, 2016
Real estate properties	$	12,952
Other assets, net	511
Properties held for sale	$	13,463
Accounts payable and accrued expenses	$	337
Rent collected in advance	19
Security deposits	311
Liabilities related to properties held for sale	$	667

7

EQUITY COMMONWEALTH

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

Property Dispositions:

During the nine months ended September 30, 2016, we sold the following properties (dollars in thousands):

Asset	Date Sold	Number of Properties	Number of Buildings	Square Footage	Gross Sales Price		Gain (Loss) on Sale
Properties
Executive Park	February 2016	1	9	427,443	$	50,865	$	16,531
3330 N Washington Boulevard	March 2016	1	1	55,719	11,250		5,455
111 East Kilbourn Avenue	March 2016	1	1	373,669	60,500		14,677
1525 Locust Street	April 2016	1	1	98,009	17,700		8,956
633 Ahua Street	April 2016	1	1	93,141	29,000		15,963
Lakewood on the Park	May 2016	1	2	180,558	37,100		13,616
Leased Land	June 2016	1	7	—	48,450		15,914
9110 East Nichols Avenue	June 2016	1	1	143,958	17,200		642
111 River Street(1)	July 2016	1	1	566,215	235,000		78,240
Sky Park Centre	July 2016	1	2	63,485	13,700		4,745
Raintree Industrial Park	July 2016	1	12	563,182	11,500		(653		)
8701 N Mopac	August 2016	1	1	121,901	21,500		8,394
Portfolios of properties
812 San Antonio Street	May 2016	1	1	59,321
1601 Rio Grande Street	May 2016	1	1	56,219
Downtown Austin portfolio		2	2	115,540	$	32,600	$	20,584
785 Schilinger Road South	June 2016	1	1	72,000
401 Vine Street	June 2016	1	1	53,980
633 Frazier Drive	June 2016	1	1	150,000
9840 Gateway Boulevard North	June 2016	1	1	72,000
3003 South Expressway 281	June 2016	1	1	150,000
1331 North Center Parkway	June 2016	1	1	53,980
Movie theater portfolio		6	6	551,960	$	109,100	$	30,595
128 Crews Drive	July 2016	1	1	185,600
111 Southchase Boulevard	July 2016	1	1	168,087
1043 Global Avenue	July 2016	1	1	450,000
South Carolina industrial portfolio		3	3	803,687	$	30,000	$	7,244
100 East Wisconsin Avenue	August 2016	1	1	435,067
111 Monument Circle	August 2016	1	2	1,121,764
101-115 W. Washington Street	August 2016	1	1	634,058
North Point Office Complex	August 2016	1	2	873,335
Midwest portfolio		4	6	3,064,224	$	416,900	$	(15,808	)
		27	56	7,222,691	$	1,142,365	$	225,095

(1) Property sale represented a leasehold interest. 

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EQUITY COMMONWEALTH

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

During the year ended December 31, 2015, we disposed of 91 properties (135 buildings) and one land parcel with a combined 18.9 million square feet for an aggregate gross sales price of $2.0 billion, excluding closing costs.

Note 4.  Real Estate Mortgages Receivable

As of September 30, 2016 and December 31, 2015, we had total real estate mortgages receivable with an aggregate carrying value of $8.1 million included in other assets in our condensed consolidated balance sheets.  We provided mortgage financing totaling $7.7 million at 6.0% per annum in connection with our sale of three suburban office and industrial properties (18 buildings) in January 2013 in Dearborn, MI; this real estate mortgage requires monthly interest payments and matures on January 24, 2023.  We also provided mortgage financing totaling $0.4 million at 6.0% per annum in connection with our sale of a suburban office property in Salina, NY in April 2012. This real estate mortgage requires monthly interest payments and matures on April 30, 2019.

We monitor the payment history of the borrowers and have determined that no allowance for losses related to these real estate mortgages receivable was necessary at September 30, 2016, and December 31, 2015. 

Note 5.  Indebtedness

Unsecured Revolving Credit Facility and Term Loan:

We are party to a credit agreement pursuant to which the lenders agreed to provide a $750.0 million unsecured revolving credit facility, a $200.0 million5-year term loan facility, and a $200.0 million7-year term loan facility. The revolving credit facility has a scheduled maturity date of January 28, 2019, which maturity date may be extended for up to two additional periods of six months at our option subject to satisfaction of certain conditions and the payment of an extension fee of 0.075% of the aggregate amount available under the revolving credit facility. The 5-year term loan and the 7-year term loan have scheduled maturity dates of January 28, 2020 and January 28, 2022, respectively.

The credit agreement permits us to utilize up to $100.0 million of the revolving credit facility for the issuance of letters of credit. Amounts outstanding under the credit agreement generally may be prepaid at any time without premium or penalty, subject to certain exceptions. We have the right to request increases in the aggregate maximum amount of borrowings available under the revolving credit facility and term loans up to an additional $1.15 billion, subject to certain conditions.

Borrowings under the 5-year term loan and 7-year term loan will, subject to certain exceptions, bear interest at a LIBOR rate plus a margin of 90 to 180 basis points for the 5-year term loan and 140 to 235 basis points for the 7-year term loan, in each case depending on our credit rating. Borrowings under the revolving credit facility will, subject to certain exceptions, bear interest at a rate equal to, at our option, either a LIBOR rate or a base rate plus a margin of 87.5 to 155 basis points for LIBOR rate advances and 0 to 55 basis points for base rate advances, in each case depending on our credit rating. In addition, we are required to pay a facility fee of 12.5 to 30 basis points, depending on our credit rating, on the borrowings available under the revolving credit facility, whether or not utilized.

Borrowings under our revolving credit facility currently bear interest at LIBOR plus a spread, which was 125 basis points as of September 30, 2016.  As of September 30, 2016, the interest rate payable on borrowings under our revolving credit facility was 1.78%.  As of September 30, 2016, we had no balance outstanding and $750.0 million available under our revolving credit facility and the facility fee as of September 30, 2016 was 0.25%. Our term loans currently bear interest at a rate of LIBOR plus a spread, which was 140 and 180 basis points for the 5-year and 7-year term loan, respectively, as of September 30, 2016.  As of September 30, 2016, the interest rates for the amounts outstanding under our 5-year term loan and 7-year term loan were 1.93% and 2.33%, respectively.  As of September 30, 2016, we had $200.0 million outstanding under each of our 5-year and 7-year term loans.

Debt Covenants:

Our public debt indenture and related supplements and our credit agreement contain a number of financial and other covenants, including covenants that restrict our ability to incur indebtedness or to make distributions under certain circumstances and require us to maintain financial ratios and a minimum net worth.  At September 30, 2016, we believe we

9

EQUITY COMMONWEALTH

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

were in compliance with all of our respective covenants under our public debt indenture and related supplements and our credit agreement.

Senior Unsecured Notes:

At September 30, 2016, we had senior unsecured notes of $925.0 million (excluding net discounts and unamortized deferred financing fees) maturing from 2017 through 2042.

On February 16, 2016, we redeemed at par $139.1 million of our 6.25% senior unsecured notes due 2016 and recognized a loss on early extinguishment of debt of $0.1 million from the write-off of an unamortized discount and unamortized deferred financing fees for the nine months ended September 30, 2016.

Mortgage Notes Payable:

At September 30, 2016, five of our properties (8 buildings) with an aggregate net book value of $293.3 million had secured mortgage notes totaling $244.0 million (including net premiums and unamortized deferred financing fees) maturing from 2017 through 2026.

Note 6.  Shareholders’ Equity

Common Share Issuances:

See Note 10 for information regarding equity issuances related to share-based compensation.

Common Share Repurchases:

On August 24, 2015, our Board of Trustees approved a common share repurchase plan, which authorizes the repurchase of up to $100.0 million of our outstanding common shares over the twelve month period following the date of authorization. On September 14, 2015, our Board of Trustees authorized the repurchase of up to an additional $100.0 million of our outstanding common shares over the twelve month period following the date of authorization. On March 17, 2016, our Board of Trustees authorized the repurchase of up to an additional $150.0 million of our outstanding common shares over the twelve month period following the date of authorization. During the nine months ended September 30, 2016, we purchased and retired 983,789 of our common shares at a weighted average price of $25.94 per share, for a total of $25.5 million. Since the inception of the common share repurchase plan through September 30, 2016, we have purchased and retired a total of 4,394,089 of our common shares at a weighted average price of $25.80 per share, for a total of $113.4 million. In August and September 2016, the first two share repurchase authorizations, of which $86.6 million was not utilized, expired. The $150.0 million of remaining authorization available under our share repurchase program as of September 30, 2016 is scheduled to expire in March 2017.

Preferred Share Redemption:

On May 15, 2016, we redeemed all of our 11,000,000 outstanding series E preferred shares at a price of $25.00 per share, for a total of $275.0 million, plus any accrued and unpaid dividends. The redemption payment occurred on May 16, 2016 (the first business day following the redemption date). We recorded $9.6 million related to the excess fair value of consideration paid over the carrying value of the preferred shares as a reduction to net income attributable to common shareholders for the nine months ended September 30, 2016.

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EQUITY COMMONWEALTH

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

Preferred Share Distributions:

In 2016, our Board of Trustees declared distributions on our series D preferred shares and series E cumulative redeemable preferred shares to date as follows:

Declaration Date	Record Date	Payment Date	Series D Dividend Per Share		Series E Dividend Per Share
January 26, 2016	February 5, 2016	February 16, 2016	$	0.40625	$	0.453125
April 15, 2016	April 25, 2016	May 16, 2016	$	0.40625	$	0.453125
July 11, 2016	July 29, 2016	August 15, 2016	$	0.40625	$	—
October 10, 2016	October 28, 2016	November 15, 2016	$	0.40625	$	—

Note 7.  Cumulative Other Comprehensive Loss

The following tables present the amounts recognized in cumulative other comprehensive loss for the three and nine months ended September 30, 2016 (in thousands):

	Unrealized Loss on Derivative Instruments
Balance as of July 1, 2016	$	(2,234	)
Other comprehensive income before reclassifications	23
Amounts reclassified from cumulative other comprehensive loss to net income	1,094
Net current period other comprehensive income	1,117
Balance as of September 30, 2016	$	(1,117	)

	Unrealized Loss on Derivative Instruments
Balance as of January 1, 2016	$	(3,687	)
Other comprehensive loss before reclassifications	(748		)
Amounts reclassified from cumulative other comprehensive loss to net income	3,318
Net current period other comprehensive income	2,570
Balance as of September 30, 2016	$	(1,117	)

The following table presents reclassifications out of cumulative other comprehensive loss for the three and nine months ended September 30, 2016 (in thousands):

	Amounts Reclassified from Cumulative Other Comprehensive Loss to Net Income
Details about Cumulative Other Comprehensive Loss Components	Three Months Ended September 30, 2016		Nine Months Ended September 30, 2016		Affected Line Items in the Statement of Operations
Interest rate swap contracts	$	1,094	$	3,318	Interest expense

Note 8.  Income Taxes

We have elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended, and are generally not subject to federal and state income taxes provided we distribute a sufficient amount of our taxable income to our shareholders and meet other requirements for qualifying as a REIT.  We are also subject to certain state and local taxes without regard to our REIT status. In prior periods, we were subject to Australian taxes. 

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NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

Our provision for income taxes consists of the following (in thousands):

	Three Months Ended September 30,					Nine Months Ended September 30,
	2016		2015			2016		2015
Current:
State	$	225	$	90		$	465	$	270
Federal	—		—			—		525
Foreign	—		(67		)	—		2,337
	225		23			465		3,132
Deferred:
Foreign	—		—			—		(755		)
	—		—			—		(755		)
Income tax expense	$	225	$	23		$	465	$	2,377

Note 9.  Derivative Instruments

Risk Management Objective of Using Derivatives

We are exposed to certain risks relating to our ongoing business operations, including the effect of changes in interest rates.  The only risk we currently manage by using derivative instruments is related to our interest rate risk. 

We may use derivative financial instruments, including interest rate swaps, caps, options, floors and other interest rate derivative contracts, to hedge all or a portion of the interest rate risk associated with our borrowings. The principal objective of such arrangements is to minimize the risks and/or costs associated with our operating and financial structure as well as to hedge specific anticipated transactions. We do not intend to utilize derivatives for speculative or other purposes other than interest rate risk management. The use of derivative financial instruments carries certain risks, including the risk that the counterparties to these contractual arrangements are not able to perform under the agreements. To mitigate this risk, we only enter into derivative financial instruments with counterparties with high credit ratings or with major financial institutions with which we and our affiliates may also have other financial relationships. We do not anticipate that any of the counterparties will fail to meet their obligations.

Cash Flow Hedges of Interest Rate Risk

Our objectives in using interest rate derivatives are to add stability to interest expense and to manage our exposure to interest rate movements. To accomplish this objective, we periodically use interest rate swaps, caps, or other similar instruments as part of our 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 us making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in cumulative other comprehensive loss and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During 2016, such derivatives were used to hedge the variable cash flows associated with variable-rate debt. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings.

Amounts reported in cumulative other comprehensive loss related to derivatives will be reclassified to interest expense as interest payments are made on our variable-rate debt. During the next twelve months, we estimate that an additional $0.7 million will be reclassified from cumulative other comprehensive loss as an increase to interest expense.

We have interest rate swap agreements to manage our interest rate risk exposure on $168.1 million of mortgage debt due 2019, which require interest at a spread over LIBOR.  The interest rate swap agreements utilized by us qualify as cash flow hedges and effectively modify our exposure to interest rate risk by converting our floating interest rate debt to a fixed interest rate basis for this loan through December 1, 2016, thus reducing the impact of interest rate changes on future interest expense. 

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EQUITY COMMONWEALTH

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

On March 4, 2016, we purchased an interest rate cap with a LIBOR strike price of 2.50%. The interest rate cap, effective April 1, 2016, has a notional amount of $400.0 million and a maturity date of March 1, 2019.

As of September 30, 2016, we had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk:

Interest Rate Derivative	Number of Instruments	Notional Amount (in thousands)
Interest rate swap	2	$	168,103
Interest rate cap	1	$	400,000

The table below presents the fair value of our derivative financial instruments as well as their classification on the condensed consolidated balance sheets as of September 30, 2016 and December 31, 2015 (amounts in thousands):

		Fair Value as of
Interest Rate Derivative Designated as Hedging Instrument	Balance Sheet Location	September 30, 2016			December 31, 2015
Pay-fixed swaps	Accounts payable and accrued expenses	$	(707	)	$	(3,687	)
Interest rate cap	Other assets	$	112		$	—

The table below details the location in the financial statements of the gain or loss recognized on interest rate derivatives designated as cash flow hedges for the three and nine months ended September 30, 2016 and 2015 (amounts in thousands):

	Three Months Ended September 30,					Nine Months Ended September 30,
	2016		2015			2016			2015
Amount of gain (loss) recognized in cumulative other comprehensive loss	$	23	$	(418	)	$	(748	)	$	(1,378	)
Amount of loss reclassified from cumulative other comprehensive loss into interest expense	1,094		1,239			3,318			3,698

Credit-risk-related Contingent Features

Our agreements with each of our derivative counterparties contain a provision providing that if we default or are capable of being declared in default on any of our indebtedness, we could also be declared in default on our derivative obligations.

As of September 30, 2016, the fair value of derivatives in a net liability position including accrued interest but excluding any adjustment for nonperformance risk related to these agreements was $1.1 million. As of September 30, 2016, we have not posted any collateral related to these agreements and were not in breach of any agreement provisions. If we had breached any of these provisions, we could have been required to settle our obligations under the agreements at their aggregate termination value of $1.1 million at September 30, 2016.

Note 10. Share-Based Compensation

Equity Commonwealth 2015 Omnibus Incentive Plan

On January 26, 2016, the Board of Trustees approved an amendment to the 2015 Omnibus Incentive Plan (as amended, the 2015 Incentive Plan) to allow the Compensation Committee (Committee) to authorize in an award agreement a transfer of all or a part of certain equity awards not for value to a “family member” (as defined in the 2015 Incentive Plan).

Recipients of the Company’s restricted shares have the same voting rights as any other common shareholder. During the period of restriction, the Company’s unvested restricted shareholders are eligible to receive dividend payments on their shares at the same rate and on the same date as any other common shareholder. Recipients of the Company’s restricted stock units (RSUs) are entitled to receive dividends with respect to the common shares underlying the RSUs if and when the RSUs are earned, at which time the recipient will be entitled to receive an amount in cash equal to the aggregate amount of cash dividends that would have been paid in respect of the common shares underlying the recipient’s earned RSUs had such common

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NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

shares been issued to the recipient on the first day of the performance period. To the extent that an award does not vest, the dividends will be forfeited.

2016 Equity Award Activity

On June 16, 2016, in accordance with the Company’s compensation plan for independent Trustees, the Committee awarded each of the nine independent Trustees $0.1 million in restricted shares as part of their compensation for the 2016-2017 year of service on the Board of Trustees. These awards equated to 3,463 shares per Trustee, for a total of 31,167 shares, valued at $28.88 per share, the closing price of our common shares on the New York Stock Exchange (NYSE) on that day. These shares vest one year after the date of the award.

On January 26, 2016, the Committee approved a grant of 136,623 restricted common shares and 277,386 RSUs at target to the Company’s officers, certain employees and to Mr. Zell, the Chairman of our Board of Trustees, as part of their compensation for fiscal year 2015.  

The restricted shares are service based awards and vest over a four-year period. The restricted shares were granted on January 26, 2016 and were valued at $26.93 per share, the closing price of our common shares on the NYSE on that day.

The RSUs are market based awards with a service condition and recipients may earn the RSU grants based on the Company’s total shareholder return (TSR) relative to the TSR's for the constituent REITs that comprise the NAREIT Office Index for the performance period of January 26, 2016 - January 26, 2019. Following the end of the performance period on January 26, 2019, the number of earned awards will be determined. The earned awards vest in two tranches with 50% of the earned award vesting on January 26, 2019 and the remaining 50% of the earned award vesting on January 26, 2020, subject to the grant recipient’s continued employment. Compensation expense for the RSU awards was determined using a Monte Carlo simulation model and is being recognized ratably from the grant date to the vesting date of each tranche.

During the nine months ended September 30, 2016, due to employee departures, 539 restricted shares were forfeited with an average price per share value at grant date of $26.82, and 1,094 RSUs were forfeited with an average per share fair value at grant date of $38.72.

2015 Equity Award Activity

On June 16, 2015, in accordance with the Company’s compensation plan for independent Trustees, the Committee awarded each of the nine independent Trustees $0.1 million in restricted shares as part of their compensation for the 2015-2016 year of service on the Board of Trustees. These awards equated to 3,843 shares per Trustee, for a total of 34,587 shares, valued at $26.02 per share, the closing price of our common shares on the NYSE on that day. These shares vested one year after the date of the award.

On January 28, 2015, the Committee approved a grant of 126,319 restricted common shares and 256,467 RSUs at target to the Company’s officers, certain employees and to Mr. Zell, the Chairman of our Board of Trustees, as part of their compensation for fiscal year 2014.  

The restricted shares are service based awards and vest over a four-year period. The restricted shares were granted on January 28, 2015 and were valued at $26.58 per share, the closing price of our common shares on the NYSE on that day.

The RSUs are market based awards with a service condition and recipients may earn the RSU grants based on the Company’s total shareholder return (TSR) relative to the TSR's for the constituent REITs that comprise the NAREIT Office Index for the performance period of January 28, 2015 - January 28, 2018. Following the end of the performance period on January 28, 2018, the number of earned awards will be determined. The earned awards vest in two tranches with 50% of the earned award vesting on January 28, 2018 and the remaining 50% of the earned award vesting on January 28, 2019, subject to the grant recipient’s continued employment. Compensation expense for the RSU awards was determined using a Monte Carlo simulation model and is being recognized ratably from the grant date to the vesting date of each tranche.

During the nine months ended September 30, 2015, 8,115 restricted shares were forfeited with an average per share fair value at grant date of $26.64, and 16,475 RSUs were forfeited with an average per share fair value at grant date of $20.50.

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EQUITY COMMONWEALTH

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

Outstanding Equity Awards

As of September 30, 2016, the estimated future compensation expense for all unvested restricted share grants was $14.1 million. Compensation expense for the restricted share awards is being recognized on a straight-line basis over the requisite service period for each separately vesting portion of the award. The weighted average period over which the future compensation expense will be recorded for the restricted shares is approximately 2.3 years.

As of September 30, 2016, the estimated future compensation expense for all unvested RSUs was $22.2 million. The weighted average period over which the future compensation expense will be recorded for the RSUs is approximately 2.2 years.

The assumptions and fair values for the RSUs granted for the nine months ended September 30, 2016 are included in the following table on a per share basis.

	2016
Fair value of RSUs granted	$	38.80
Expected term (years)	4
Expected volatility	—
Expected dividend yield	1.86		%
Risk-free rate	1.07		%

During the three months ended September 30, 2016 and 2015, we recorded $4.9 million and $3.7 million, respectively, and during the nine months ended September 30, 2016 and 2015, we recorded $13.9 million and $11.8 million, respectively, of compensation expense, net of forfeitures, in general and administrative expense for grants to our Board of Trustees and the Company's employees related to our Plan. At September 30, 2016, 2,358,464 common shares remain available for issuance under the Plan.

Note 11.  Fair Value of Assets and Liabilities

The table below presents certain of our assets and liabilities measured at fair value during 2016, categorized by the level of inputs used in the valuation of each asset and liability (dollars in thousands):

				Fair Value at September 30, 2016 Using
				Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs			Significant Unobservable Inputs
Description	Total			(Level 1)		(Level 2)			(Level 3)
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	$	(707	)	$	—	$	(707	)	$	—
Effective portion of interest rate cap contract	112			—		112			—

Effective Portion of Interest Rate Swap and Cap Contracts

The fair value of our interest rate swap and cap contracts is determined using the net discounted cash flows of each derivative based on the market based interest rate curve (level 2 inputs) and adjusted for our credit spread and the actual and estimated credit spreads of the counterparties (level 3 inputs).  Although we have determined that the majority of the inputs used to value our derivatives fall within level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize level 3 inputs, such as estimates of current credit spreads, to evaluate the likelihood of default by us and the counterparties.  As of September 30, 2016, we have assessed the significance of the impact of the credit valuation adjustments on the overall valuation of our derivative positions and have determined that the credit valuation adjustments are not significant to the overall valuation of our derivatives.  As a result, we have determined that our derivative valuations in their entirety are classified as level 2 inputs in the fair value hierarchy.

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EQUITY COMMONWEALTH

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

Derivative Liability

On July 31, 2014, our shareholders voted to approve the reimbursement of verified expenses incurred by Related Fund Management, LLC and Corvex Management LP (Related/Corvex) (see Note 14 for additional information). Approximately $16.7 million was paid during the year ended December 31, 2014. Up to $8.4 million was to be reimbursed only if the average closing price of our common shares was at least $26.00 (as adjusted for any share splits or share dividends) during the one year period after the date on which the reimbursement was approved by shareholders, and up to $8.4 million was to be reimbursed only if the average closing price of our common shares was at least $26.00 (as adjusted for any share splits or share dividends) during the one year period between the first and second anniversaries of the date on which the reimbursement was approved by shareholders. The average closing price of our common shares was at least $26.00 during both the first and second one year periods after the date on which the reimbursement was approved by shareholders, and as a result, in August 2016 and 2015 we paid an $8.2 million final payment and $8.4 million, respectively, to Related/Corvex.

Prior to the payment of the reimbursement in August 2016, the potential future reimbursement of $8.4 million for the second one year period represented a derivative instrument as codified in ASC 815 Derivatives and Hedging which required the potential future reimbursement to be recorded at fair value at each reporting date. The fair value of the derivative liability as of September 30, 2016 and December 31, 2015 was $0 and $7.2 million, respectively. We recognized (income) expense of $(0.1) million and $1.0 million for the three and nine months ended September 30, 2016, respectively, which was recorded in general and administrative expenses in our condensed consolidated statement of operations for such periods.

Properties Held and Used

As part of our disposition plan, and pursuant to our accounting policy, in 2016, we evaluated the recoverability of the carrying values of each of the real estate assets that comprised our portfolio and determined that due to the shortening of the expected periods of ownership as a result of the disposition plan and current estimates of market value, it was necessary to reduce the net book value of a portion of the real estate assets in our portfolio to their estimated fair values. We anticipate the potential disposition of certain properties prior to the end of their remaining useful lives. As a result, in the second quarter, we recorded an impairment charge related to 111 Monument Circle, 101-115 W. Washington Street and 100 East Wisconsin Avenue of $43.7 million for the nine months ended September 30, 2016 in accordance with our impairment analysis procedures. We determined these impairments based on third party offer prices and independent third party broker information, which are level 2 inputs according to the fair value hierarchy established in ASC 820. We reduced the aggregate carrying value of these properties from $308.6 million to their estimated fair value of $264.9 million. These properties were sold in August 2016 (see Note 3 for additional information). We evaluated each of our properties and determined there were no additional valuation adjustments necessary at September 30, 2016.

Financial Instruments

In addition to the assets and liabilities described in the above table, our financial instruments include our cash and cash equivalents, real estate mortgages receivable, restricted cash, senior unsecured debt and mortgage notes payable.  At September 30, 2016 and December 31, 2015, the fair value of these additional financial instruments were not materially different from their carrying values, except as follows (in thousands):

	September 30, 2016				December 31, 2015
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Senior unsecured debt and mortgage notes payable, net	$	1,557,260	$	1,618,274	$	1,697,116	$	1,749,211

The fair values of our senior notes and mortgage notes payable are based on estimates using discounted cash flow analyses and currently prevailing interest rates adjusted by credit risk spreads (level 3 inputs).

Our cash and cash equivalents consists of cash maintained in time deposits, depository accounts and money market accounts.  From time-to-time we may also invest in various U.S. government securities.  We continually monitor the credit ratings of the financial institutions holding our deposits to minimize our exposure to credit risk.  Throughout the year, we have cash balances in excess of federally insured limits deposited with various financial institutions. We do not believe we are exposed to any significant credit risk on cash and cash equivalents.

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EQUITY COMMONWEALTH

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

Other financial instruments that potentially subject us to concentrations of credit risk consist principally of rents receivable; however, as of September 30, 2016, no single tenant of ours is responsible for more than 5.5% of our total annualized rents.

Our derivative financial instruments, including interest rate swaps and cap, are entered with major financial institutions and we monitor the amount of credit exposure to any one counterparty.

Note 12.  Earnings Per Common Share

The following table sets forth the computation of basic and diluted earnings per share (amounts in thousands except per share amounts):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Numerator for earnings per common share - basic and diluted:
Net income	$	86,388		$	30,466		$	220,634		$	56,712
Preferred distributions	(1,997		)	(6,981		)	(15,959		)	(20,943		)
Excess fair value of consideration paid over carrying value of preferred shares	—			—			(9,609		)	—
Numerator for net income per share	$	84,391		$	23,485		$	195,066		$	35,769
Denominator for earnings per common share - basic and diluted:
Weighted average number of common shares outstanding - basic	125,533			128,739			125,627			129,386
Weighted average number of common shares outstanding - diluted(1)	126,568			129,878			127,009			130,093
Net income per common share attributable to Equity Commonwealth common shareholders:
Basic	$	0.67		$	0.18		$	1.55		$	0.28
Diluted	$	0.67		$	0.18		$	1.54		$	0.27
Anti-dilutive securities:
Effect of Series D preferred shares; 6 1/2% cumulative convertible(2)	2,363			2,363			2,363			2,363

(1) As of September 30, 2016, we had granted RSUs to certain employees, officers, and the chairman of the Board of Trustees.  The RSUs contain both service and market-based vesting components.  None of the RSUs have vested. If the market-based vesting component was measured as of September 30, 2016, and 2015, 1,035 and 1,139 common shares would be issued to the RSU holders, respectively. Using a weighted average basis, 1,035 and 1,139 common shares are reflected in diluted earnings per share for the three months ended September 30, 2016 and 2015, respectively and 1,382 and 707 common shares are reflected in diluted earnings per share for the nine months ended September 30, 2016 and 2015, respectively.

(2) The Series D preferred shares are excluded from the diluted earnings per share calculation because including the Series D preferred shares would also require that the preferred distributions be added back to net income, resulting in anti-dilution during the periods presented.

Note 13.  Segment Information

Our primary business is the ownership and operation of office properties, and we currently have one reportable segment.  Due to significant dispositions, during the fourth quarter of 2015, we changed the composition of our operating segments from two reportable segments (central business district properties and suburban properties) to one reportable segment.  This change

17

EQUITY COMMONWEALTH

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

was made based on the financial information reviewed and used by the chief operating decision maker to make operating decisions, assess performance, develop strategy and allocate capital resources. More than 95% of our revenues for the nine months ended September 30, 2016 are from office properties. 

Note 14.  Related Person Transactions

The following discussion includes a description of our related person transactions for the nine months ended September 30, 2016 and 2015.

Related Person Transactions Following the Special Meeting:

Equity Group Investments and associated entities: We have a lease with Two North Riverside Plaza Joint Venture Limited Partnership, an entity associated with Mr. Zell, our Chairman, to occupy office space on the twentieth and twenty-first floors of Two North Riverside Plaza in Chicago, Illinois (20th/21st Floor Office Lease). The initial term of the lease is approximately five years, with one5-year renewal option. We recently completed improvements to the office space utilizing the $0.7 million tenant improvement allowance provided for by the lease. In connection with the 20th/21st Floor Office Lease, we also have a lease with Two North Riverside Plaza Joint Venture Limited Partnership for storage space in the basement of Two North Riverside Plaza. The lease expires December 31, 2020, however each party has the right to terminate on 30 days' prior written notice. During the three and nine months ended September 30, 2016, we recognized expense of $0.2 million and $0.6 million, respectively, pursuant to the 20^th/21^st Floor Office Lease and the related storage space.

We had a license agreement with Equity Group Investments, a private investment firm (Equity Group), to use office space on the sixth floor at Two North Riverside Plaza. The license fee included the non-exclusive use of additional areas on the sixth floor (such as conference rooms and common areas), certain administrative services (such as mail room services and reception desk staffing), office equipment, office furniture, supplies, licensee’s share of building operating expenses and real estate taxes and access to one parking space. Mr. Zell, our Chairman, is the Chairman and Chief Executive Officer of Equity Group, and Mr. Helfand, our President and Chief Executive Officer, is the Co-President of Equity Group. The license agreement was terminated as of December 30, 2015. During the three and nine months ended September 30, 2015, we recognized expense of $46,000 and $0.1 million, respectively, pursuant to the license agreement.

We had a sublease with Equity Residential Management, L.L.C. to occupy office space on the tenth floor of Two North Riverside Plaza. Equity Residential Management, L.L.C. leases the space from Two North Riverside Plaza Joint Venture Limited Partnership. The sublease agreement was terminated as of December 30, 2015. During the three and nine months ended September 30, 2015, we recognized expense of $0.1 million and $0.3 million, respectively, pursuant to the tenth floor office sublease.

Related/Corvex: On July 31, 2014, at the reconvened session of our 2014 annual meeting of shareholders, our shareholders voted to approve the reimbursement of approximately $33.5 million of verified expenses incurred by Related/Corvex since February 2013 in connection with their consent solicitations to remove our former Trustees and elect the new Board of Trustees and to engage in related litigation. Approximately $16.7 million was paid during the year ended December 31, 2014.  Up to $8.4 million was to be reimbursed only if the average closing price of our common shares was at least $26.00 (as adjusted for any share splits or share dividends) during the one year period after the date on which the reimbursement was approved by shareholders, and up to $8.4 million was to be reimbursed only if the average closing price of our common shares was at least $26.00 (as adjusted for any share splits or share dividends) during the one year period between the first and second anniversaries of the date on which the reimbursement was approved by shareholders. The average closing price of our common shares was at least $26.00 during both the first and second one year periods after the date on which the reimbursement was approved by shareholders, and as a result, in August 2016 and 2015 we paid an $8.2 million final payment and $8.4 million, respectively, to Related/Corvex.

Transactions with Prior Related Persons:

Certain related person transactions, and their approvals, relate to Reit Management & Research LLC (RMR) and RMR Australia Asset Management Pty Ltd (together, Former Manager) or occurred prior to the election of our new Board of Trustees at the special meeting of shareholders held on May 23, 2014 (Special Meeting) and the appointment of our current executive officers following the Special Meeting, as described below.

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EQUITY COMMONWEALTH

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

Termination and Cooperation Agreement: On September 30, 2014, we entered into a termination and cooperation agreement (Cooperation Agreement) with Former Manager. Under the terms of the agreement, the existing business and property management agreements with RMR terminated effective September 30, 2014.

Pursuant to the Cooperation Agreement, through February 28, 2015, Former Manager agreed to use best efforts to assist us in the transition of our management and operations. We paid Former Manager $1.2 million per month for transition services from October 1, 2014 to February 28, 2015, which included continued management and other services for the Australian assets pursuant to the Australian Management Agreement. Beginning March 1, 2015, we agreed to pay Former Manager $0.1 million per month until we no longer required such services or until the Australia Management Agreement was terminated, which was terminated in the third quarter of 2015, effective October 31, 2015. There is no future obligation to pay any fees to Former Manager.

Note 15.  Subsequent Events

In October 2016, we sold one property (four buildings), with 151,917 square feet for $29.2 million, excluding closing costs.  This property was classified as held for sale as of September 30, 2016 (see Note 3).

In October 2016, we purchased a parcel of land adjacent to our Research Park property in Austin, Texas for $2.8 million.

On November 1, 2016, we delivered notice of our intent to redeem at par our $250 million6.25% senior unsecured notes due 2017 on December 15, 2016.  The notes will be redeemed for cash at a price equal to 100% of the principal amount of the notes plus any accrued and unpaid interest up to, but excluding, the redemption date.

19

Item 2.  Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion should be read in conjunction with our consolidated financial statements and accompanying notes included in this Quarterly Report, and in our Annual Report.

FORWARD-LOOKING STATEMENTS

Some of the statements contained in this Quarterly Report constitute forward-looking statements within the meaning of the federal securities laws. Any forward-looking statements contained in this Quarterly Report are intended to be made pursuant to the safe harbor provisions of Section 27A of the Securities Act of 1933, as amended, or the Securities Act, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act. Forward-looking statements relate to expectations, beliefs, projections, future plans and strategies, anticipated events or trends and similar expressions concerning matters that are not historical facts. In particular, statements pertaining to our capital resources, portfolio performance and results of operations contain forward-looking statements. Likewise, all of our statements regarding anticipated growth in market conditions are forward-looking statements. In some cases, you can identify forward-looking statements by the use of forward-looking terminology such as “may,” “will,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” or “potential” or the negative of these words and phrases or similar words or phrases which are predictions of or indicate future events or trends and which do not relate solely to historical matters. You can also identify forward-looking statements by discussions of strategy, plans or intentions.

The forward-looking statements contained in this Quarterly Report reflect our current views about future events and are subject to numerous known and unknown risks, uncertainties, assumptions and changes in circumstances that may cause our actual results to differ significantly from those expressed in any forward-looking statement. We do not guarantee that the transactions and events described will happen as described (or that they will happen at all). We disclaim any obligation to publicly update or revise any forward-looking statement to reflect changes in underlying assumptions or factors, of new information, data or methods, future events or other changes. For a further discussion of these and other factors that could cause our future results to differ materially from any forward-looking statements, see the section entitled “Risk Factors” in our Annual Report on Form 10-K.

OVERVIEW

We are an internally managed and self-advised REIT engaged in the ownership and operation primarily of office buildings throughout the United States. We were formed in 1986 under Maryland law.

At September 30, 2016, our portfolio, excluding properties held for sale, included 37 properties (67 buildings) with a combined 16.7 million square feet for a total investment of $2.9 billion at cost and a depreciated book value of $2.2 billion.

As of September 30, 2016, our overall portfolio was 91.2% leased. During the three months ended September 30, 2016, we entered into leases for 237,000 square feet, including lease renewals for 46,000 square feet and new leases for 191,000 square feet.  Renewal leases entered into during the three months ended September 30, 2016 had weighted average cash and GAAP rental rates that were approximately 14.6% higher and 24.2% higher, respectively, as compared to prior rental rates for the same space, and new leases entered into during the three months ended September 30, 2016 had weighted average cash and GAAP rental rates that were approximately 12.6% lower and 3.4% higher, respectively, than prior rental rates for the same space.  The change in GAAP rents is different than the change in cash rents due to differences in the amount of rent abatements, the magnitude and timing of contractual rent increases over the lease term, and the years of term for the newly executed leases compared to the prior leases.

Throughout 2016, our management team has continued to focus on executing our plan to reshape our portfolio in order to create long-term value for shareholders. We are continuing to dispose of properties that do not meet our long-term goals. Specifically, we continue to implement the strategy adopted by our Board of Trustees to consider disposing of assets that have one or more of the following attributes:

• assets that do not offer an opportunity to create a competitive advantage;

• assets that are less than 150,000 square feet;

• assets that are not office buildings;

• assets that are not located in the U.S.; or

• assets that produce a low cash yield or require significant capital expenditures.

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We are in the process of executing this strategy and, depending on market conditions, will likely sell additional properties. During the year ended December 31, 2015, we disposed of 91 properties (135 buildings) and one land parcel with a combined 18.9 million square feet for an aggregate gross sales price of $2.0 billion, excluding closing costs.

During the nine months ended September 30, 2016, we sold 27 properties (56 buildings) with a combined 7.2 million square feet for an aggregate gross sales price of $1.1 billion, excluding closing costs. In October 2016, we sold one property (four buildings), with 151,917 square feet for $29.2 million, excluding closing costs. This property was classified as held for sale as of September 30, 2016. For more information regarding this transaction, see Notes 3 and 15 to the notes to our condensed consolidated financial statements included in Part I, Item 1 of this Quarterly Report.

We have generated significant proceeds from our dispositions to date and have a cash balance of $2.4 billion as of September 30, 2016. We expect to reinvest the capital received from dispositions to purchase new properties, repay debt, buy back common shares or make other investments or distributions that further our long-term strategic goals. However, we may not be able to make suitable acquisitions or other investments with the proceeds from the dispositions. In addition, as our real estate investments have decreased, our income from operations has also declined.

As part of the disposition plan noted above, and pursuant to our accounting policy, in 2016, we evaluated the recoverability of the carrying values of each of the real estate assets that comprised our portfolio and determined that due to the shortening of the expected periods of ownership as a result of the disposition plan and current estimates of market value, it was necessary to reduce the net book value of a portion of the real estate assets in our portfolio to their estimated fair values. As a result, we recorded an impairment charge of $43.7 million for the nine months ended September 30, 2016 in accordance with our impairment analysis procedures.

The Board of Trustees intends to make a decision about declaring a dividend on our common shares of beneficial ownership after evaluation of the Company's taxable income, including gains or losses from asset sales. The Board of Trustees has regularly reviewed our dividend policy and will continue to do so, at least annually.

We have engaged CBRE, Inc. (CBRE) to provide property management services for our properties. We pay CBRE a property-by-property management fee and may engage CBRE from time-to-time to perform project management services, such as coordinating and overseeing the completion of tenant improvements and other capital projects at the properties. We reimburse CBRE for certain expenses incurred in the performance of its duties, including certain personnel and equipment costs.

For the three months ended September 30, 2016 and 2015, we incurred expenses of $6.3 million and $9.8 million, respectively, and for the nine months ended September 30, 2016 and 2015, we incurred expenses of $20.6 million and $34.6 million, respectively, related to our property management agreement with CBRE, for property management fees, typically calculated as a portion of the properties' revenues, and salary and benefits reimbursements for property personnel, such as property managers, engineers and maintenance staff.  As of September 30, 2016 and December 31, 2015, we had amounts payable pursuant to these services of $3.5 million.

Property Operations

Leased occupancy data for 2016 and 2015 are as follows (square feet in thousands):

	All Properties(1)				Comparable Properties(2)
	As of September 30,				As of September 30,
	2016		2015		2016		2015
Total properties	37		67		37		37
Total square feet	16,710		25,258		16,710		16,635
Percent leased(3)	91.2	%	91.9	%	91.2	%	92.5	%

(1) Excludes properties sold or classified as held for sale in the period. 

(2) Based on properties owned continuously from January 1, 2015 through September 30, 2016, and excludes properties sold or classified as held for sale during the period.

(3) Percent leased includes (i) space being fitted out for occupancy pursuant to existing leases and (ii) space which is leased but is not occupied or is being offered for sublease by tenants.

21

The weighted average lease term based on square feet for leases entered into during the three months ended September 30, 2016 was 7.4 years.  Commitments made for leasing expenditures and concessions, such as tenant improvements and leasing commissions, for leases entered into during the three months ended September 30, 2016 totaled $11.0 million, or $47.06 per square foot on average (approximately $6.37 per square foot per year of the lease term).

As of September 30, 2016, approximately 1.5% of our leased square feet and 0.6% of our annualized rental revenue, determined as set forth below, are included in leases scheduled to expire through December 31, 2016.  Renewed and new leases and rental rates at which available space may be relet in the future will depend on prevailing market conditions at the times these leases are negotiated.  We believe that the in-place cash rents for leases expiring for the remainder of 2016 are slightly above market. Lease expirations by year, as of September 30, 2016, are as follows (square feet and dollars in thousands):

Year	Number of Tenants Expiring	Leased Square  Feet Expiring(1)	% of Leased Square Feet Expiring(1)		Cumulative % of Leased Square Feet Expiring(1)		Annualized Rental Revenue Expiring(2)		% of Annualized Rental Revenue Expiring		Cumulative % of Annualized Rental Revenue Expiring
2016	42	221	1.5	%	1.5	%	$	2,448	0.6	%	0.6	%
2017	88	974	6.4	%	7.9	%	26,180		6.9	%	7.5	%
2018	79	1,117	7.3	%	15.2	%	34,152		9.1	%	16.6	%
2019	89	1,269	8.3	%	23.5	%	31,916		8.5	%	25.1	%
2020	80	3,313	21.7	%	45.2	%	63,570		16.9	%	42.0	%
2021	71	1,641	10.8	%	56.0	%	46,947		12.4	%	54.4	%
2022	37	755	5.0	%	61.0	%	26,668		7.1	%	61.5	%
2023	46	1,602	10.5	%	71.5	%	45,963		12.2	%	73.7	%
2024	19	601	3.9	%	75.4	%	10,932		2.9	%	76.6	%
2025	18	729	4.8	%	80.2	%	20,039		5.3	%	81.9	%
Thereafter	44	3,011	19.8	%	100.0	%	68,227		18.1	%	100.0	%
	613	15,233	100.0	%			$	377,042	100.0	%
Weighted average remaining lease term (in years):		5.8					5.6

(1) Square footage is pursuant to existing leases as of September 30, 2016, excluding leases related to properties classified as held for sale, and includes (i) space being fitted out for occupancy and (ii) space which is leased but is not occupied or is being offered for sublease. 

(2) Annualized rental revenue is annualized contractual rents from our tenants pursuant to leases which have commenced as of September 30, 2016, plus estimated recurring expense reimbursements; includes triple net lease rents and excludes lease value amortization, straight line rent adjustments, abated ("free") rent periods and parking revenue. We calculate annualized rental revenue by aggregating the recurring billings outlined above for the most recent month during the quarter reported, adding abated rent, and multiplying the sum by 12 to provide an estimation of near-term potentially-recurring revenues.  Annualized rental revenue is a forward-looking non-GAAP measure.  Annualized rental revenue cannot be reconciled to a comparable GAAP measure without unreasonable efforts, primarily due to the fact that it is calculated from the billings of tenants in the most recent month at the most recent rental rates during the quarter reported, whereas historical GAAP measures include billings from a potentially different group of tenants over multiple months at potentially different rental rates.

22

A principal source of funds for our operations is rents from tenants at our properties.  Rents are generally received from our tenants monthly in advance, except from our government tenants, who usually pay rents monthly in arrears.  As of September 30, 2016, tenants representing 1% or more of our total annualized rental revenue were as follows (square feet in thousands):

Tenant(1)		Square Feet(2)	% of Total Square Feet(2)		% of Annualized Rental Revenue(3)		Weighted Average Remaining Lease Term
1.	Expedia, Inc.	427	2.8	%	5.3	%	3.2
2.	Office Depot, Inc.	640	4.2	%	4.4	%	7.1
3.	PNC Financial Services Group	368	2.4	%	3.2	%	4.7
4.	Groupon, Inc. (4)	376	2.5	%	3.1	%	9.3
5.	Flextronics International Ltd.	1,051	6.9	%	2.9	%	3.2
6.	University of Pennsylvania Health System	267	1.8	%	2.2	%	9.1
7.	Ballard Spahr LLP	217	1.4	%	2.1	%	13.4
8.	RE/MAX Holdings, Inc.	248	1.6	%	2.0	%	11.6
9.	Exelon Corporation	183	1.2	%	1.8	%	1.7
10.	Georgetown University	240	1.6	%	1.7	%	3.0
11.	Towers Watson & Co	251	1.6	%	1.7	%	3.5
12.	M&T Bank Corporation	211	1.4	%	1.6	%	2.0
13.	Wm. Wrigley Jr. Company	150	1.0	%	1.5	%	5.3
14.	West Corporation	336	2.2	%	1.4	%	12.4
15.	Truven Health Analytics	179	1.2	%	1.3	%	0.4
16.	TheraCom, LLC	156	1.0	%	1.2	%	6.3
17.	Baxalta, Inc.	260	1.7	%	1.2	%	11.8
18.	Level 3 Communications, Inc.	95	0.6	%	1.1	%	9.3
19.	Capital One Financial Corp.	241	1.6	%	1.1	%	2.3
20.	The United States Government	107	1.6	%	1.1	%	0.9
21.	ProQuest, LLC	131	0.9	%	1.1	%	4.6
	Total	6,134	41.2	%	43.0	%	5.9

(1) Tenants located in properties classified as held for sale are excluded.

(2) Square footage is pursuant to existing leases as of September 30, 2016, and includes (i) space being fitted out for occupancy and (ii) space which is leased but is not occupied or is being offered for sublease. 

(3) Annualized rental revenue is annualized contractual rents from our tenants pursuant to leases which have commenced as of September 30, 2016, plus estimated recurring expense reimbursements; includes triple net lease rents and excludes lease value amortization, straight line rent adjustments, abated ("free") rent periods and parking revenue. We calculate annualized rental revenue by aggregating the recurring billings outlined above for the most recent month during the quarter reported, adding abated rent, and multiplying the sum by 12 to provide an estimation of near-term potentially-recurring revenues.  Annualized rental revenue is a forward-looking non-GAAP measure.  Annualized rental revenue cannot be reconciled to a comparable GAAP measure without unreasonable efforts, primarily due to the fact that it is calculated from the billings of tenants in the most recent month at the most recent rental rates during the quarter reported, whereas historical GAAP measures include billings from a potentially different group of tenants over multiple months at potentially different rental rates.

(4) Groupon, Inc. statistics include 207,536 square feet that are sublet from Bankers Life and Casualty Company.

Financing Activities

On May 15, 2016, we redeemed all of our 11,000,000 outstanding series E preferred shares at a price of $25.00 per share, for a total of $275.0 million, plus any accrued and unpaid dividends. The redemption payment occurred on May 16, 2016 (the first business day following the redemption date).

On February 16, 2016, we redeemed at par $139.1 million of our 6.25% senior unsecured notes due 2016 and recognized a loss on early extinguishment of debt of $0.1 million from the write-off of an unamortized discount and unamortized deferred financing fees for the nine months ended September 30, 2016.

23

On March 4, 2016, we purchased an interest rate cap with a LIBOR strike price of 2.50%. The interest rate cap, effective April 1, 2016, has a notional amount of $400.0 million and a maturity date of March 1, 2019.

For more information regarding our financing sources and activities, please see the section captioned “Liquidity and Capital Resources—Our Investment and Financing Liquidity and Resources” below.

24

RESULTS OF OPERATIONS

Three Months Ended September 30, 2016, Compared to Three Months Ended September 30, 2015

	Comparable Properties Results(1)											Other Properties Results(2)						Consolidated Results
	Three Months Ended September 30,
	2016			2015			$ Change			% Change		2016			2015			2016			2015			$ Change			% Change
	(in thousands)
Rental income	$	81,574		$	77,465		$	4,109		5.3	%	$	11,148		$	47,994		$	92,722		$	125,459		$	(32,737	)	(26.1	)%
Tenant reimbursements and other income	18,783			20,777			(1,994		)	(9.6	)%	3,127			12,972			21,910			33,749			(11,839		)	(35.1	)%
Operating expenses	(42,408		)	(42,230		)	(178		)	0.4	%	(6,905		)	(31,341		)	(49,313		)	(73,571		)	24,258			(33.0	)%
Net operating income(3)	$	57,949		$	56,012		$	1,937		3.5	%	$	7,370		$	29,625		65,319			85,637			(20,318		)	(23.7	)%
Other expenses:
Depreciation and amortization																		29,184			40,522			(11,338		)	(28.0	)%
General and administrative																		13,277			16,249			(2,972		)	(18.3	)%
Total other expenses																		42,461			56,771			(14,310		)	(25.2	)%
Operating income																		22,858			28,866			(6,008		)	(20.8	)%
Interest and other income																		3,013			637			2,376			373.0	%
Interest expense																		(21,427		)	(25,111		)	3,684			(14.7	)%
Loss on early extinguishment of debt																		—			(3,887		)	3,887			(100.0	)%
Foreign currency exchange loss																		—			(9,809		)	9,809			(100.0	)%
Gain on sale of properties																		82,169			39,793			42,376			106.5	%
Income before income taxes																		86,613			30,489			56,124			184.1	%
Income tax expense																		(225		)	(23		)	(202		)	878.3	%
Net income																		86,388			30,466			55,922			183.6	%
Preferred distributions																		(1,997		)	(6,981		)	4,984			(71.4	)%
Net income attributable to Equity Commonwealth common shareholders																		$	84,391		$	23,485		$	60,906		259.3	%

(1) Comparable properties consist of 37 properties (67 buildings) we owned continuously from July 1, 2015 to September 30, 2016.

(2) Other properties consist of properties sold and classified as held for sale.

(3) We calculate net operating income, or NOI, as shown above.  We define NOI as income from our real estate including lease termination fees received from tenants less our property operating expenses.  NOI excludes amortization of capitalized tenant improvement costs and leasing commissions.  We consider NOI to be an appropriate supplemental measure to net income because it may help both investors and management to understand the operations of our properties.  We use NOI internally to evaluate property level performance, and we believe that NOI provides useful information to investors regarding our results of operations because it reflects only those income and expense items that are incurred at the property level and may facilitate comparisons of our operating performance between periods and with other REITs.  NOI does not represent cash generated by operating activities in accordance with GAAP and should not be considered as an alternative to net income, net income attributable to Equity Commonwealth common shareholders, operating income or cash flow from operating activities, determined in accordance with GAAP, or as an indicator of our financial performance or liquidity, nor is this measure necessarily indicative of sufficient cash flow to fund all of our needs.  This measure should be considered in conjunction with net income, net income attributable to Equity Commonwealth common shareholders, operating income and cash flow from operating activities as presented in our consolidated statements of operations, consolidated statements of comprehensive income and consolidated statements of cash flows.  Other REITs and real estate companies may calculate NOI differently than we do.

We refer to the 37 properties (67 buildings) we owned continuously from July 1, 2015 to September 30, 2016, as comparable properties.  We refer to the sold properties and properties classified as held for sale as other properties.  Our condensed consolidated statements of operations for the three months ended September 30, 2016 and 2015 include the operating results of 37 properties for the entire periods, as we owned these properties as of July 1, 2015. 

Rental income.Rental income decreased $32.7 million, or 26.1%, in the 2016 period, compared to the 2015 period, primarily due to the properties sold in 2015 and 2016, partially offset by an increase of 5.3% in rental income at the comparable properties. The increase in rental income at the comparable properties is primarily due to charges against revenue of $2.8 million recognized during the three months ended September 30, 2015 related to a one-time parking tax matter and a tenant lease termination at 600 West Chicago Avenue in the 2015 period.

25

Rental income includes increases for straight line rent adjustments totaling $3.0 million in the 2016 period and $1.9 million in the 2015 period, and net reductions for amortization of acquired real estate leases and assumed real estate lease obligations totaling $0.9 million in the 2016 period and $2.8 million in the 2015 period. Rental income also includes the recognition of lease termination fees totaling $1.8 million in the 2016 period and $1.8 million in the 2015 period.

Tenant reimbursements and other income. Tenant reimbursements and other income decreased $11.8 million, or 35.1%, in the 2016 period, compared to the 2015 period primarily due to the properties sold in 2016 and 2015. Tenant reimbursements and other income decreased $2.0 million, or 9.6%, at our comparable properties primarily due to a decrease in real estate tax reimbursements.

Operating expenses. The $24.3 million, or 33.0%, decrease in operating expenses during the 2016 period as compared to the 2015 period is due to the properties sold in 2016 and 2015. Operating expenses increased $0.2 million, or 0.4%, at the comparable properties primarily due to increases in maintenance and repairs, partially offset by a decrease in real estate tax expense.

Depreciation and amortization. The $11.3 million, or 28.0%, decrease in depreciation and amortization expense during the 2016 period as compared to the 2015 period primarily relates to properties sold in 2016 and 2015.

General and administrative. The $3.0 million, or 18.3%, decrease in general and administrative expenses primarily relates to a $5.8 million decrease in shareholder litigation and transition-related expenses, partially offset by $1.7 million of compensation expenses in the 2016 period related to a staffing reduction, and a $1.0 million increase in share-based compensation expense.

Operating income. The decrease of $6.0 million, or 20.8%, in operating income is primarily due to lower net operating income as a result of our smaller size portfolio of assets, partially offset by lower depreciation expense as a result of our smaller size portfolio of assets.

Interest and other income. The increase of $2.4 million of interest and other income in the 2016 period as compared to the 2015 period primarily reflects additional interest received on higher cash balances in the current year.

Interest expense. The decrease of $3.7 million, or 14.7%, in interest expense primarily reflects the defeasance of the outstanding $141.4 million balance of the mortgage debt secured by 111 East Wacker Drive, one of the buildings included in the Illinois Center disposition, in August 2015, the repayment of the $116.0 mortgage debt at 111 Monument Circle in December 2015 and the prepayment of $139.1 million of our 6.25% senior unsecured notes in February 2016, partially offset by a decrease in amortization of net mortgage debt premiums.

Loss on early extinguishment of debt. The loss on early extinguishment of debt in the 2015 period reflects a $3.9 million loss related to the defeasance of the mortgage loan secured by 111 East Wacker Drive, one of the buildings included in the Illinois Center disposition.

Foreign currency exchange loss. The foreign currency exchange loss for the three months ended September 30, 2015 relates to the translation of the proceeds from the sale of the Australian portfolio that were held in an Australian bank account.

Gain on sale of properties. Gain on sale of properties increased $42.4 million in the 2016 period as compared to the 2015 period due to gains in 2016 of $78.2 million, $4.7 million, $8.4 million, and $7.2 million related to the sales of 111 River Street, Sky Park Centre, 8701 N Mopac and the South Carolina industrial portfolio, respectively. These gains were partially offset by losses in the third quarter of 2016 of $0.7 million and $15.8 million related to the sales of Raintree Industrial Park and the Midwest portfolio, respectively.

In the third quarter of 2015, we recorded gains of $26.9 million, $17.6 million and $7.9 million related to the sales of Illinois Center, 185 Asylum Street and 16th and Race Street, respectively. These gains were partially offset by a loss in the third quarter of $12.5 million related to the sale of a portfolio in upstate New York.

Income tax expense. The $0.2 million increase in income tax expense primarily relates to an increase in state taxes due to the sale of properties in the state of South Carolina.

Preferred distributions. The $5.0 million decrease in preferred distributions relates to the redemption of all of our 11,000,000 outstanding series E preferred shares on May 15, 2016.

26

RESULTS OF OPERATIONS

Nine Months EndedSeptember 30, 2016, Compared to Nine Months EndedSeptember 30, 2015

	Comparable Properties Results(1)											Other Properties Results(2)						Consolidated Results
	Nine Months Ended September 30,
	2016			2015			$ Change			% Change		2016			2015			2016			2015			$ Change			% Change
	(in thousands)
Rental income	$	243,917		$	234,785		$	9,132		3.9	%	$	80,428		$	222,343		$	324,345		$	457,128		$	(132,783	)	(29.0	)%
Tenant reimbursements and other income	55,944			61,619			(5,675		)	(9.2	)%	16,845			57,210			72,789			118,829			(46,040		)	(38.7	)%
Operating expenses	(120,484		)	(122,070		)	1,586			(1.3	)%	(37,480		)	(139,058		)	(157,964		)	(261,128		)	103,164			(39.5	)%
Net operating income(3)	$	179,377		$	174,334		$	5,043		2.9	%	$	59,793		$	140,495		239,170			314,829			(75,659		)	(24.0	)%
Other expenses:
Depreciation and amortization																		102,766			156,858			(54,092		)	(34.5	)%
General and administrative																		38,766			43,718			(4,952		)	(11.3	)%
Loss on asset impairment																		43,736			17,162			26,574			154.8	%
Total other expenses																		185,268			217,738			(32,470		)	(14.9	)%
Operating income																		53,902			97,091			(43,189		)	(44.5	)%
Interest and other income																		7,184			4,813			2,371			49.3	%
Interest expense																		(65,074		)	(82,926		)	17,852			(21.5	)%
(Loss) gain on early extinguishment of debt																		(118		)	6,111			(6,229		)	(101.9	)%
Foreign currency exchange loss																		(5		)	(8,953		)	8,948			(99.9	)%
Gain on sale of properties																		225,210			42,953			182,257			424.3	%
Income before income taxes																		221,099			59,089			162,010			274.2	%
Income tax expense																		(465		)	(2,377		)	1,912			(80.4	)%
Net income																		220,634			56,712			163,922			289.0	%
Preferred distributions																		(15,959		)	(20,943		)	4,984			(23.8	)%
Excess fair value of consideration paid over carrying value of preferred shares																		(9,609		)	—			(9,609		)	(100.0	)%
Net income attributable to Equity Commonwealth common shareholders																		$	195,066		$	35,769		$	159,297		445.3	%

(1) Comparable properties consist of 37 properties (67 buildings) we owned continuously from January 1, 2015 to September 30, 2016.

(2) Other properties consist of properties sold and classified as held for sale.

(3) See Note 3 on page 25 for further information regarding NOI.

We refer to the 37 properties (67 buildings) we owned continuously from January 1, 2015 to September 30, 2016, as comparable properties.  We refer to the sold properties and properties classified as held for sale as other properties.  Our condensed consolidated statements of operations for the nine months ended September 30, 2016 and 2015 include the operating results of 37 properties for the entire periods, as we owned these properties as of January 1, 2015. 

Rental income.Rental income decreased $132.8 million, or 29.0%, in the 2016 period, compared to the 2015 period, primarily due to the properties sold in 2015 and 2016, partially offset by an increase of 3.9% in rental income at the comparable properties. The increase in rental income at the comparable properties is due to leasing activity in 2015 at a particular building where one tenant vacated its space and two tenants shortened their remaining lease terms. In connection with these leasing transactions, the corresponding deferred rent receivable balances were written off or amortized over the shorter term, resulting in a decrease in rental income in the 2015 period. The increase in rental income at the comparable properties is also due to charges against revenue of $2.7 million recognized during the nine months ended September 30, 2015 related to a one-time parking tax matter and a tenant lease termination at 600 West Chicago Avenue in the 2015 period.

Rental income includes increases for straight line rent adjustments totaling $12.4 million in the 2016 period and $3.6 million in the 2015 period, and net reductions for amortization of acquired real estate leases and assumed real estate lease obligations totaling $5.9 million in the 2016 period and $6.0 million in the 2015 period. Rental income also includes the recognition of lease termination fees totaling $19.6 million in the 2016 period, which includes the $18.0 million lease termination fee received at 111 Monument Circle, and $7.9 million in the 2015 period.

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Tenant reimbursements and other income. Tenant reimbursements and other income decreased $46.0 million, or 38.7%, in the 2016 period, compared to the 2015 period primarily due to the properties sold in 2016 and 2015. Tenant reimbursements and other income decreased $5.7 million, or 9.2%, at our comparable properties primarily due to a decrease in utility reimbursements as a result of the milder winter in 2016, a decrease in real estate tax reimbursements and a bankruptcy settlement received in the prior year.

Operating expenses. The $103.2 million, or 39.5%, decrease in operating expenses during the 2016 period as compared to the 2015 period is due to the properties sold in 2016 and 2015. Operating expenses decreased $1.6 million, or 1.3%, at our comparable properties primarily due to a decrease in utility expense as a result of the milder winter in 2016, a decrease in real estate tax expense and a decrease in bad debt expense, partially offset by increases in maintenance and repairs.

Depreciation and amortization. The $54.1 million, or 34.5%, decrease in depreciation and amortization expense during the 2016 period as compared to the 2015 period primarily relates to properties sold in 2015 and 2016.

General and administrative. The decrease of $5.0 million, or 11.3%, in general and administrative expenses primarily relates to a $5.9 million decrease related to the shareholder approved reimbursement of expenses incurred by Related/Corvex in connection with their consent solicitation to remove our former Trustees, a decrease of $2.6 million of expenses related to the termination and cooperation agreement with RMR, and a $1.7 million decrease in litigation costs, partially offset by an increase of $1.9 million for share-based compensation expense, $1.7 million of compensation expenses in the 2016 period related to a staffing reduction, an increase of $0.8 million in legal costs, and a $0.6 million increase in technology expenses due to a software upgrade.

Loss on asset impairment. The increase of $26.6 million in loss on asset impairment is due to additional charges that we incurred in the nine months ended September 30, 2016 as compared to the 2015 period. We recorded impairment charges of $43.7 million in the 2016 period related to 111 Monument Circle, 101-115 W. Washington Street and 100 East Wisconsin Avenue, based upon the shortening of our expected periods of ownership as a result of our disposition plan and updated market information in accordance with our impairment analysis procedures. During the nine months ended September 30, 2015, we recorded impairment charges of $17.2 million related to 12655 Olive Boulevard, 1285 Fern Ridge Parkway and portfolios of properties located in Georgia and New York, based upon updated market information in accordance with our impairment analysis procedures.

Operating income. The decrease of $43.2 million, or 44.5%, in operating income is primarily due to lower net operating income as a result of our smaller size portfolio of assets and an increase in the loss on asset impairment. These decreases in operating income were partially offset by a lease termination fee of $18.0 million received at 111 Monument Circle in the 2016 period and lower depreciation expense as a result of our smaller size portfolio of assets.

Interest and other income. The increase of $2.4 million of interest and other income in the 2016 period primarily reflects interest received on higher cash balances in the current year. Interest and other income in the 2015 period primarily reflects a $3.1 million gain on the sale of securities in the first quarter of 2015.

Interest expense. The decrease of $17.9 million, or 21.5%, in interest expense primarily reflects the prepayment of $138.8 million of our 5.75% senior unsecured notes in May 2015, the foreclosure of the $40.1 million mortgage debt balance secured by 225 Water Street in May 2015, the defeasance of the outstanding $141.4 million balance of the mortgage debt secured by 111 East Wacker Drive, one of the buildings included in the Illinois Center disposition, in August 2015, the repayment of the $116.0 mortgage debt at 111 Monument Circle in December 2015 and the prepayment of $139.1 million of our 6.25% senior unsecured notes in February 2016, partially offset by a decrease in amortization of net mortgage debt premiums.

(Loss) gain on early extinguishment of debt. We had a loss on early extinguishment of debt of $0.1 million during the nine months ended September 30, 2016 compared to a gain on early extinguishment of debt of $6.1 million during the nine months ended September 30, 2015. The loss on early extinguishment in the 2016 period reflects the write-off of an unamortized discount and unamortized deferred financing fees related to our redemption of $139.1 million of our 6.25% senior unsecured notes due 2016. The gain on early extinguishment of debt in the 2015 period reflects a $17.3 million gain related to the 225 Water Street foreclosure, partially offset by a $6.2 million loss related to the defeasance of the mortgage loan secured by 1320 Main Street, a $3.9 million loss related to the defeasance of the mortgage loan secured by 111 East Wacker Drive, one of the buildings included in the Illinois Center disposition, a $0.6 million loss related to the prepayment of mortgage debt at 2501 20th Place South, a $0.1 million loss related to the redemption of $138.8 million of our 5.75% senior unsecured notes due 2015 and a $0.4 million loss related to the termination of our prior credit agreement.

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Foreign currency exchange loss. The foreign currency exchange loss for the nine months ended September 30, 2015 relates to the translation of proceeds from the sale of the Australian portfolio that were held in an Australian bank account.

Gain on sale of properties. Gain on sale of properties increased $182.3 million in the 2016 period as compared to the 2015 period due to a $16.5 million gain on the sale of Executive Park, a $5.5 million gain on the sale of 3330 N Washington Boulevard, a $14.7 million gain on the sale of 111 East Kilbourn Avenue, a $9.0 million gain on the sale of 1525 Locust Street, a $16.0 million gain on the sale of 633 Ahua Street, a $13.6 million gain on the sale of Lakewood on the Park, a $15.9 million gain on the sale of leased land, a $20.6 million gain on the sale of the downtown Austin portfolio, a $30.6 million gain on the sale of the movie theater portfolio and a $0.6 million gain on the sale of 9110 East Nichols Avenue. In the third quarter of 2016 we recorded gains of $78.2 million, $4.7 million, $8.4 million, and $7.2 million related to the sales of 111 River Street, Sky Park Centre, 8701 N Mopac and the South Carolina industrial portfolio, respectively. These gains were partially offset by losses in the third quarter of 2016 of $0.7 million and $15.8 million related to the sales of Raintree Industrial Park and the Midwest portfolio, respectively.

In the first quarter of 2015, we sold two properties and recorded a $5.9 million gain on sale of properties. In the second quarter of 2015, we recorded gains of $41.6 million and $11.9 million related to the sales of an office portfolio in AL, LA, NC, SC and Sorrento Valley Business Park, respectively. In the third quarter of 2015, we recorded gains of $26.9 million, $17.6 million and $7.9 million related to the sales of Illinois Center, 185 Asylum Street and 16th and Race Street, respectively. These gains were partially offset by a loss in the second quarter on the sale of properties in Australia of $47.9 million, which is net of the write off of approximately $63.2 million of foreign currency translation adjustments previously recorded in accumulated other comprehensive loss. We also recognized losses in the second quarter of $8.1 million and $2.3 million related to sales of a portfolio of small office and industrial properties and two properties in St. Louis, respectively, and a loss in the third quarter of $12.5 million related to the sale of a portfolio in upstate New York.

Income tax expense. The $1.9 million decrease in income tax expense primarily relates to a decrease in foreign tax expense due to the sale of the Australian assets in 2015 and federal income tax expense incurred in 2015 as a result of a taxable built-in gain triggered by the sale of a property that was previously owned by a C corporation.

Preferred distributions. The $5.0 million decrease in preferred distributions relates to the redemption of all of our 11,000,000 outstanding series E preferred shares on May 15, 2016.

Excess fair value of consideration paid over carrying value of preferred shares. On May 15, 2016, we redeemed all of our 11,000,000 outstanding series E preferred shares at a price of $25.00 per share and recorded $9.6 million related to the excess fair value of consideration paid over the carrying value of the preferred shares as a reduction to net income attributable to common shareholders for the nine months ended September 30, 2016.

LIQUIDITY AND CAPITAL RESOURCES

Our Operating Liquidity and Resources

As of September 30, 2016, we had $2.4 billion of cash and cash equivalents.  We expect to use our cash balances, cash flow from our operations and proceeds of future property sales to fund our operations, repay debt, make distributions, purchase our common shares, acquire assets, fund tenant improvements and leasing costs and for other general business purposes.  We believe our cash balances and the cash flow from our operations will be sufficient to fund our ordinary course activities.

Our future cash flows from operating activities will depend primarily upon our:

•ability to maintain or improve the occupancy of, and the rental rates at, our properties;

•ability to control operating and financing cost increases at our properties; and

• ability to purchase additional properties which produce rents, less property operating expenses, in excess of our costs of acquisition capital.

Volatility in energy costs and real estate taxes may cause our future operating costs to fluctuate; however, the impact of these fluctuations is expected to be partially offset by the pass through of operating costs to our tenants pursuant to lease terms,

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although there can be no assurance that we will be able to successfully offset these costs or that doing so would not negatively impact our competitive position or business. 

Cash flows provided by (used in) operating, investing and financing activities were $116.7 million, $943.9 million and $(458.2) million, respectively, for the nine months ended September 30, 2016, and $141.4 million, $1,411.7 million and $(258.9) million, respectively, for the nine months ended September 30, 2015.  Changes in these three categories of our cash flows between 2016 and 2015 are primarily related to real estate improvements, our dispositions of properties, our purchase of our common shares and our redemption of our preferred shares.

Our Investment and Financing Liquidity and Resources

In order to maintain financial flexibility, to fund acquisitions and to meet cash needs that may result from timing differences between our receipt of rents and our desire or need to make distributions and investments or pay operating or capital expenses, we maintain an unsecured revolving credit facility with a group of institutional lenders. Our credit agreement provides us with (i) a $750.0 million unsecured revolving credit facility, (ii) a $200.0 million 5-year term loan facility and (iii) a $200.0 million 7-year term loan facility. The revolving credit facility has a scheduled maturity date of January 28, 2019, which maturity date may be extended for up to two additional periods of six months at our option subject to satisfaction of certain conditions and the payment of an extension fee of 0.075% of the aggregate amount available under the revolving credit facility. The 5-year term loan and the 7-year term loan have scheduled maturity dates of January 28, 2020 and January 28, 2022, respectively. We used the proceeds of borrowings under the credit agreement to repay all amounts outstanding and due under the previous term loan agreement.

Borrowings under our revolving credit facility currently bear interest at LIBOR plus a spread, which was 125 basis points as of September 30, 2016.  We also pay a facility fee of 25 basis points per annum on the total amount of lending commitments under our revolving credit facility.  Both the interest rate spread and the facility fee are subject to adjustment based upon changes to our credit ratings.  We are allowed to borrow, repay and reborrow funds available under our revolving credit facility until maturity, and no principal repayment is due until maturity.  As of September 30, 2016, the interest rate payable on borrowings under our revolving credit facility was 1.78%.  As of September 30, 2016, we had no balance outstanding under our revolving credit facility.

Our term loans currently bear interest at a rate of LIBOR plus a spread, which was 140 and 180 basis points for the 5-year and 7-year term loan, respectively, as of September 30, 2016.  The interest rate spread is subject to adjustment based upon changes to our credit ratings.  As of September 30, 2016, the interest rate for the amounts outstanding under our term loan was 1.93% and 2.33% for the 5-year and 7-year term loan, respectively. As of September 30, 2016, our 5-year and 7-year term loans each had outstanding balances of $200.0 million.

On February 16, 2016, we redeemed at par $139.1 million of our 6.25% senior unsecured notes due 2016.

During the nine months ended September 30, 2016, we paid an aggregate of $16.0 million of distributions on our series D and series E preferred shares.  On May 15, 2016, we redeemed all of our 11,000,000 outstanding series E preferred shares at a price of $25.00 per share, for a total of $275.0 million, plus any accrued and unpaid dividends. The redemption payment occurred on May 16, 2016 (the first business day following the redemption date). On October 10, 2016, we announced that our Board of Trustees declared a dividend of $0.40625 per series D preferred share, which is expected to be paid on November 15, 2016 to shareholders of record on October 28, 2016.

On March 17, 2016, our Board of Trustees authorized the repurchase of up to an additional $150.0 million of our outstanding common shares over the twelve month period following the date of authorization. This is in addition to the $200.0 million previously authorized by our Board of Trustees in 2015. During the nine months ended September 30, 2016, we purchased and retired 983,789 of our common shares at a weighted average price of $25.94 per share for a total investment of $25.5 million. Since the inception of the common share repurchase plan through September 30, 2016, we have purchased and retired a total of 4,394,089 of our common shares at a weighted average price of $25.80 per share, for a total of $113.4 million. In August and September 2016, the first two share repurchase authorizations, of which $86.6 million was not utilized, expired. The $150.0 million of remaining authorization available under our share repurchase program as of September 30, 2016 is scheduled to expire in March 2017.

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Our outstanding debt maturities and weighted average interest rates as of September 30, 2016, were as follows (dollars in thousands):

	Scheduled Principal Payments During Period
Year	Unsecured Floating Rate Debt		Unsecured Fixed Rate Debt			Secured Fixed Rate Debt			Total(1)		Weighted Average Interest Rate(2)
2016	$	—	$	—		$	860		$	860	5.8	%
2017	—		250,000		(3)	44,865			294,865		6.2	%
2018	—		250,000			3,847			253,847		6.6	%
2019	—		—			164,613		(4)	164,613		5.7	%
2020	200,000		250,000			1,674			451,674		4.1	%
2021	—		—			25,982			25,982		5.7	%
2022	200,000		—			799			200,799		2.3	%
2023	—		—			702			702		5.7	%
2024	—		—			743			743		5.7	%
2025	—		—			787			787		5.7	%
Thereafter	—		175,000		(5)	204			175,204		5.7	%
	$	400,000	$	925,000		$	245,076		$	1,570,076	5.1	%

(1) Total debt outstanding as of September 30, 2016, including net unamortized premiums and discounts and net unamortized deferred financing costs, equals $1,557,260.

(2) Weighted based on current contractual interest rates.

(3) On November 1, 2016, we delivered notice of our intent to redeem at par our $250 million 6.25% senior unsecured notes due 2017 on December 15, 2016.  The notes will be redeemed for cash at a price equal to 100% of the principal amount of the notes plus any accrued and unpaid interest up to, but excluding, the redemption date.

(4) We have a mortgage loan with an aggregate outstanding principal balance as of September 30, 2016 of $168,103 secured by 1735 Market Street that matures in 2019. Interest on this loan is payable at a rate equal to a spread over LIBOR, but the interest rate has been fixed by a cash flow hedge which sets the rate at approximately 5.66% per year until December 1, 2016.

(5) The 5.75% senior unsecured notes due 2042 are callable at par on or after August 1, 2017.

For a description of our financing activities since January 1, 2016, see “Financing Activities” above.  Also, for further information about our indebtedness, see Note 5 to the notes to our condensed consolidated financial statements included in Part I, Item 1 of this Quarterly Report.

When significant amounts are outstanding under our revolving credit facility, or as the maturity dates of our revolving credit facility and term debts approach, we explore alternatives to repay amounts due. Such alternatives may include incurring additional debt and issuing new equity securities, extending the maturity of our revolving credit facility and entering into a new revolving credit facility. We have an effective shelf registration statement that allows us to issue public securities on an expedited basis, but it does not assure that there will be buyers for such securities.

We believe that we will have access to various types of financings, including debt or equity offerings, to fund our future acquisitions and to pay our debts and other obligations as they become due. The completion and the costs of our future debt transactions will depend primarily upon market conditions and our credit ratings. We have no control over market conditions. Our credit ratings depend upon evaluations by credit rating agencies of our business practices and plans and, in particular, whether we appear to have the ability to maintain our earnings, to space our debt maturities and to balance our use of debt and equity capital so that our financial performance and leverage ratios afford us flexibility to withstand any reasonably foreseeable adverse changes. We intend to conduct our business activities in a manner which will continue to afford us reasonable access to capital for investment and financing activities. However, there can be no assurance regarding our credit ratings or our ability to complete any debt or equity offerings or that our cost of any future public or private financings will not increase.

During the nine months ended September 30, 2016, we sold 27 properties (56 buildings) with a combined 7,222,691 square feet for an aggregate sales price of $1.1 billion, excluding closing costs. In October 2016, we sold one property (four buildings), with 151,917 square feet for $29.2 million, excluding closing costs. This property was classified as held for sale as

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of September 30, 2016. For more information regarding this transaction, see Notes 3 and 15 to the notes to our condensed consolidated financial statements included in Part I, Item 1 of this Quarterly Report.

During the three and nine months ended September 30, 2016 and 2015, amounts capitalized at our properties, including properties sold, for tenant improvements, leasing costs and building improvements were as follows (amounts in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Tenant improvements(1)	$	20,411	$	13,497	$	65,339	$	33,398
Leasing costs(2)	2,292		14,166		22,666		34,732
Building improvements(3)	8,942		5,327		23,196		13,252

(1) Tenant improvements include capital expenditures to improve tenants’ spaces.

(2) Leasing costs primarily include brokerage commissions and legal expenses.

(3) Building improvements generally include expenditures to replace obsolete building components and expenditures that extend the useful life of existing assets. Tenant-funded capital expenditures are excluded.

During the three months ended September 30, 2016, commitments made for expenditures in connection with leasing space at our properties were as follows (dollar and square foot measures in thousands):

	New Leases		Renewals		Total
Rentable square feet leased during the period	191		46		237
Tenant improvements and leasing commissions	$	9,887	$	1,110	$	10,997
Tenant improvements and leasing commissions per rentable square foot	$	52.53	$	24.26	$	47.06
Weighted average lease term by square foot (years)	8.0		4.9		7.4
Total tenant improvements and leasing commissions per rentable square foot per year	$	6.59	$	4.93	$	6.37

Debt Covenants

Our unsecured debt obligations at September 30, 2016 were our term loans and our publicly issued senior unsecured notes. Our public debt indenture and related supplements, our revolving credit facility and our term loan agreement contain a number of financial ratio covenants which generally restrict our ability to incur debts, in excess of calculated amounts, restrict our ability to make distributions under certain circumstances and require us to maintain other financial ratios.  At September 30, 2016, we believe we were in compliance with all covenants under both our indenture and related supplements, and under our revolving credit facility and our term loan agreement.  In addition to our unsecured debt obligations, we had $244.0 million (including net unamortized premiums and discounts and net unamortized deferred financing costs) of mortgage notes outstanding at September 30, 2016.

None of our indenture and related supplements, our revolving credit facility and term loan agreement, or our mortgage notes contain provisions for acceleration or require us to provide collateral security which could be triggered by our debt ratings.  However, our senior debt rating is used to determine the interest rate and the fees payable under our revolving credit facility and our term loan agreement.

Off Balance Sheet Arrangements

As of September 30, 2016, we had no off balance sheet arrangements that have had or that we expect would be reasonably likely to have a future material effect on our financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources.  We had no swaps or hedges as of September 30, 2016, other than the cash flow hedges associated with our $168.1 million of mortgage debt and $400.0 million of our floating rate debt described in Note 9 to the notes to our condensed consolidated financial statements, under “Our Investment and Financing Liquidity and Resources” above in Part I, Item 2 and under “Quantitative and Qualitative Disclosures About Market Risk” included in Part I, Item 3 of this Quarterly Report.

Funds from Operations (FFO) and Normalized FFO

We compute FFO in accordance with standards established by the National Association of Real Estate Investment Trusts (NAREIT). NAREIT defines FFO as net income (loss), calculated in accordance with GAAP, excluding real estate depreciation

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and amortization, gains (or losses) from sales of depreciable property, impairment of depreciable real estate, and our portion of these items related to equity investees and non-controlling interests.  Our calculation of Normalized FFO differs from NAREIT’s definition of FFO because we exclude certain items that we view as nonrecurring or impacting comparability from period to period.  We consider FFO and Normalized FFO to be appropriate measures of operating performance for a REIT, along with net income, net income attributable to Equity Commonwealth common shareholders, operating income and cash flow from operating activities.

We believe that FFO and Normalized FFO provide useful information to investors because by excluding the effects of certain historical amounts, such as depreciation expense, FFO and Normalized FFO may facilitate a comparison of our operating performance between periods and with other REITs.  FFO and Normalized FFO do not represent cash generated by operating activities in accordance with GAAP and should not be considered as alternatives to net income, net income attributable to Equity Commonwealth common shareholders, operating income or cash flow from operating activities, determined in accordance with GAAP, or as indicators of our financial performance or liquidity, nor are these measures necessarily indicative of sufficient cash flow to fund all of our needs.  These measures should be considered in conjunction with net income, net income attributable to Equity Commonwealth common shareholders, operating income and cash flow from operating activities as presented in our condensed consolidated statements of operations, condensed consolidated statements of comprehensive income and condensed consolidated statements of cash flows.  Other REITs and real estate companies may calculate FFO and Normalized FFO differently than we do.

The following table provides a reconciliation of net income to FFO attributable to Equity Commonwealth common shareholders and a calculation to Normalized FFO attributable to Equity Commonwealth common shareholders (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Reconciliation to FFO:
Net income	$	86,388		$	30,466		$	220,634		$	56,712
Real estate depreciation and amortization	28,907			40,522			102,015			156,858
Loss on asset impairment	—			—			43,736			17,162
Gain on sale of properties	(82,169		)	(39,793		)	(225,210		)	(42,953		)
FFO attributable to Equity Commonwealth	33,126			31,195			141,175			187,779
Preferred distributions	(1,997		)	(6,981		)	(15,959		)	(20,943		)
Excess fair value of consideration paid over carrying value of preferred shares	—			—			(9,609		)	—
FFO attributable to Equity Commonwealth common shareholders	$	31,129		$	24,214		$	115,607		$	166,836
Reconciliation to Normalized FFO:
FFO available for Equity Commonwealth common shareholders	$	31,129		$	24,214		$	115,607		$	166,836
Lease value amortization	882			2,766			5,870			6,033
Straight line rent adjustments	(2,954		)	(1,901		)	(12,384		)	(3,584		)
Loss (gain) on early extinguishment of debt	—			3,887			118			(6,111		)
Minimum cash rent from direct financing lease	—			2,032			—			6,096
Interest earned from direct financing lease	—			(96		)	—			(356		)
Shareholder litigation costs and transition-related expenses	(138		)	5,474			999			8,731
Transition services fee	—			198			—			2,613
Gain on sale of securities	—			—			—			(3,080		)
Foreign currency exchange loss	—			9,809			5			8,953
Excess fair value of consideration paid over carrying value of preferred shares	—			—			9,609			—
Normalized FFO attributable to Equity Commonwealth common shareholders	$	28,919		$	46,383		$	119,824		$	186,131

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Property Net Operating Income (NOI)

We use property net operating income, or NOI, to evaluate the performance of our properties. We define NOI as income from our real estate including lease termination fees received from tenants less our property operating expenses. NOI excludes amortization of capitalized tenant improvement costs and leasing commissions and corporate level expenses.

The following table includes the reconciliation of NOI to net income, the most directly comparable financial measure under GAAP reported in our consolidated financial statements.  We consider NOI to be an appropriate supplemental measure to net income because we believe it helps to understand the operations of our properties.  We use NOI internally to evaluate property level performance, and we believe that NOI provides useful information to investors regarding our results of operations because it reflects only those income and expense items that are incurred at the property level and may facilitate comparisons of our operating performance between periods and with other REITs.  NOI does not represent cash generated by operating activities in accordance with GAAP and should not be considered as an alternative to net income, net income attributable to Equity Commonwealth common shareholders, operating income or cash flow from operating activities, determined in accordance with GAAP, or as an indicator of our financial performance or liquidity, nor is this measure necessarily indicative of sufficient cash flow to fund all of our needs.  This measure should be considered in conjunction with net income, net income attributable to Equity Commonwealth common shareholders, operating income and cash flow from operating activities as presented in our consolidated statements of operations, consolidated statements of comprehensive income and consolidated statements of cash flows.  Other REITs and real estate companies may calculate NOI differently than we do. 

A reconciliation of NOI to net income for the three and nine months ended September 30, 2016 and 2015, is as follows (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Rental income	$	92,722		$	125,459		$	324,345		$	457,128
Tenant reimbursements and other income	21,910			33,749			72,789			118,829
Operating expenses	(49,313		)	(73,571		)	(157,964		)	(261,128		)
NOI	$	65,319		$	85,637		$	239,170		$	314,829
NOI	$	65,319		$	85,637		$	239,170		$	314,829
Depreciation and amortization	(29,184		)	(40,522		)	(102,766		)	(156,858		)
General and administrative	(13,277		)	(16,249		)	(38,766		)	(43,718		)
Loss on asset impairment	—			—			(43,736		)	(17,162		)
Operating income	22,858			28,866			53,902			97,091
Interest and other income	3,013			637			7,184			4,813
Interest expense	(21,427		)	(25,111		)	(65,074		)	(82,926		)
(Loss) gain on early extinguishment of debt	—			(3,887		)	(118		)	6,111
Foreign currency exchange loss	—			(9,809		)	(5		)	(8,953		)
Gain on sale of properties	82,169			39,793			225,210			42,953
Income from continuing operations before income taxes	86,613			30,489			221,099			59,089
Income tax expense	(225		)	(23		)	(465		)	(2,377		)
Net income	$	86,388		$	30,466		$	220,634		$	56,712

Related Person Transactions

For information about our related person transactions, see Note 14 to the notes to our condensed consolidated financial statements included in Part I, Item 1 of this Quarterly Report. In addition, for more information about these transactions and relationships and about the risks that may arise as a result of these and other related person transactions and relationships, please see Note 11 to the notes to our condensed consolidated financial statements included in Part I, Item 1 of this Quarterly Report and under “Results of Operations” included in Part I, Item 2 of this Quarterly Report.

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Item 3.  Quantitative and Qualitative Disclosures About Market Risk.

We are exposed to risks associated with market changes in interest rates, as set forth below.

Interest Rate Risk

We manage our exposure to interest rate risk by monitoring available financing alternatives. Other than as described below, we do not currently foresee any significant changes in our exposure to fluctuations in interest rates or in how we manage this exposure in the near future.

At September 30, 2016, our outstanding fixed rate debt consisted of the following senior unsecured notes and secured mortgage notes (dollars in thousands):

Senior Unsecured Notes:

Debt	Principal Balance(1)		Annual Interest Rate(1)		Annual Interest Expense(1)		Maturity	Open at Par Date
6.250% senior unsecured notes due 2017(2)	$	250,000	6.25	%	$	15,625	6/15/2017	12/15/2016
6.650% senior unsecured notes due 2018	250,000		6.65	%	16,625		1/15/2018	7/15/2017
5.875% senior unsecured notes due 2020	250,000		5.88	%	14,688		9/15/2020	3/15/2020
5.750% senior unsecured notes due 2042	175,000		5.75	%	10,063		8/1/2042	8/1/2017
	$	925,000			$	57,001

(1) The principal balance, annual interest rate and annual interest expense are the amounts stated in the applicable contracts.  In accordance with GAAP, our carrying values and recorded interest expense may differ from these amounts because of market conditions and issuance costs at the time we issued these debts.  For more information, see Note 5 to the notes to our condensed consolidated financial statements included in Part I, Item I of this Quarterly Report.

(2) On November 1, 2016, we delivered notice of our intent to redeem at par our $250 million 6.25% senior unsecured notes due 2017 on December 15, 2016.  The notes will be redeemed for cash at a price equal to 100% of the principal amount of the notes plus any accrued and unpaid interest up to, but excluding, the redemption date.

No principal repayments are due under our senior unsecured notes until maturity.

Secured Mortgage Notes:

Debt	Principal Balance(1)		Annual Interest Rate(1)		Annual Interest Expense(1)		Maturity	Open at Par Date
Parkshore Plaza	$	41,275	5.67	%	$	2,373	5/1/2017	12/1/2016
1735 Market Street(2)	168,103		5.66	%	9,650		12/2/2019	12/1/2016
206 East 9th Street	27,164		5.69	%	1,601		1/5/2021	7/5/2020
33 Stiles Lane	2,510		6.75	%	201		3/1/2022	12/1/2021
97 Newberry Road	6,024		5.71	%	378		3/1/2026	None
	$	245,076			$	14,203

(1) The principal balance, annual interest rate and annual interest expense are the amounts stated in the applicable contracts.  In accordance with GAAP, our carrying values and recorded interest expense may differ from these amounts because of market conditions and issuance costs at the time we assumed or issued these debts.  For more information, see Note 5 to the notes to our condensed consolidated financial statements included in Part I, Item I of this Quarterly Report.

(2) Interest on this loan is payable at a rate equal to a spread over LIBOR, but the interest rate has been fixed by a cash flow hedge which sets the rate at approximately 5.66% until December 1, 2016.  The floating interest rate at September 30, 2016 was 3.16%. The open at par date in the table above reflects the swap expiration date, as the debt at 1735 Market Street is otherwise open for repayment.

35

Some of our secured notes require principal and interest payments through maturity pursuant to amortization schedules, and one of our secured notes require interest only payments through maturity.

Swap Agreements

We have interest rate swap agreements to manage our interest rate risk exposure on $168.1 million of mortgage notes due 2019, which require us to pay interest at a rate equal to a spread over LIBOR.  These interest rate swap agreements effectively modify our exposure to interest rate risk arising from this floating rate mortgage loan by converting this floating rate debt to a fixed rate through December 1, 2016, thus reducing the impact of interest rate changes on future interest expense.  These agreements involve the receipt of floating rate amounts in exchange for fixed rate interest payments over the life of the agreements.  Approximately 10.8% ($168.1 million) of our total outstanding debt had interest payments designated as hedged transactions to interest rate swap agreements at September 30, 2016.  As of September 30, 2016, the fair value of our derivative instruments included in accounts payable and accrued expenses and cumulative other comprehensive loss in our condensed consolidated balance sheet totaled $0.7 million.

Cap Agreement

We entered into an interest rate cap agreement on March 4, 2016, effective April 1, 2016, to manage our interest rate risk exposure on $400.0 million of floating rate debt, which requires us to pay interest at a rate equal to a spread over LIBOR. The interest rate cap has a maturity date of March 1, 2019. From and after the effective date, this interest rate cap agreement reduces our exposure to variability in expected future cash outflows attributable to changes in LIBOR, relating to a portion of our outstanding floating rate debt, by protecting us from increases in the hedged cash flows on our floating rate debt attributable to changes in LIBOR above the strike rate of the interest rate cap. As of September 30, 2016, the fair value of our derivative instruments included in other assets and cumulative other comprehensive loss in our condensed consolidated balance sheet totaled $0.1 million.

Fixed Rate Debt

Because our fixed rate unsecured and secured notes bear interest at fixed rates, changes in market interest rates during the term of these debts will not affect our interest obligations.  If all of these notes were refinanced at interest rates which are 100 basis points higher or lower than shown above, our per annum interest cost would increase or decrease, respectively, by approximately $11.7 million.

Each of our fixed rate unsecured debt arrangements and some of our secured debt arrangements allow us to make repayments earlier than the stated maturity date.  In some cases, we are not allowed to make early repayment prior to a cutoff date, and we are generally allowed to make prepayments only at a premium equal to a make whole amount, as defined, which is generally designed to preserve a stated yield to the note holder.  Also, we have repurchased and retired some of our outstanding debts and we may do so again in the future.  These prepayment rights and our ability to repurchase and retire outstanding debt may afford us opportunities to mitigate the risk of refinancing our debts at maturity at higher rates by refinancing prior to maturity.

Floating Rate Debt

At September 30, 2016, our outstanding floating rate debt consisted of our term loans.  Our $200.0 million 5-year term loan matures in January 2020 and our $200.0 million 7-year term loan matures in January 2022.  Borrowings under our revolving credit facility and term loan are in U.S. dollars and bear interest at LIBOR plus spreads that are subject to adjustment based upon changes to our credit ratings, but as of September 30, 2016, we had no balance outstanding and $750.0 million available under our revolving credit facility.  Accordingly, we are vulnerable to changes in U.S. dollar based short term rates, specifically LIBOR.  Effective April 1, 2016, we entered into an interest rate cap agreement with respect to $400.0 million of floating rate debt, as described above under “Cap Agreement.” In addition, upon renewal or refinancing of our revolving credit facility or term loan, we are vulnerable to increases in interest rates due to market conditions or our perceived credit risk.  Generally, a change in market interest rates would not affect the value of these floating rate debts, but would affect our operating results. 

36

The following table presents the impact a 100 basis point increase in interest rates, including the impact of the interest rate cap, would have on our floating rate interest expense as of September 30, 2016 (dollars in thousands):

	Impact of Changes in Interest Rates
				Total Interest
	Interest Rate Per Year(1)	Outstanding Debt		Expense Per Year
Term loans at September 30, 2016	1.93%/2.33%	$	400,000	$	8,524
100 basis point increase	2.93%/3.33%	$	400,000	$	12,524

(1) Based on the interest rates and outstanding borrowings of our floating rate debt as of September 30, 2016.

Foreign Currency Risk

Prior to the sale of our Australian portfolio, there was a risk that our financial results were affected by changes in currency exchange rates.  As a result of the sale of our Australian portfolio, our primary exposure to foreign currency exchange rates subsequent to the June 2015 disposition related to the translation of the cash and cash equivalent balance at our Australian subsidiary from Australian dollars into U.S. dollars.  As of September 30, 2016, we no longer have any foreign currency risk.

Item 4.  Controls and Procedures.

As of the end of the period covered by this report, our management carried out an evaluation, under the supervision and with the participation of our President and Chief Executive Officer and our Executive Vice President, Chief Financial Officer and Treasurer, of the effectiveness of our disclosure controls and procedures pursuant to the Securities Exchange Act of 1934, or the Exchange Act, Rules 13a-15 and 15d-15. Based upon that evaluation, our President and Chief Executive Officer and our Executive Vice President, Chief Financial Officer and Treasurer concluded that our disclosure controls and procedures are effective.

There have been no changes in our internal control over financial reporting during the quarter ended September 30, 2016 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

37

PART II.  Other Information

Item 1. Legal Proceedings.

We are or may be a party to various legal proceedings that arise in the ordinary course of business. We are not currently involved in any litigation nor, to our knowledge, is any litigation threatened against us where the outcome would, in our judgment based on information currently available to us, have a material adverse effect on our consolidated financial position or consolidated results of operations.

Item 1A. Risk Factors.

There have been no material changes to the risk factors relating to the Company disclosed in our Form 10-K for the year ended December 31, 2015.

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

Not applicable.

Item 3. Defaults Upon Senior Securities.

Not applicable.

Item 4. Mine Safety Disclosures.

Not applicable.

Item 5. Other Information.

Not applicable.

38

Item 6.  Exhibits.

Exhibit  Number	Description
3.1	Articles of Amendment and Restatement of Declaration of Trust of the Company, dated July 1, 1994, as amended to date. (Incorporated by reference to the Company’s Current Report on Form 8-K filed August 1, 2014.)
3.2	Articles Supplementary, dated October 10, 2006. (Incorporated by reference to the Company’s Current Report on Form 8-K filed October 11, 2006.)
3.3	Articles Supplementary, dated May 31, 2011. (Incorporated by reference to the Company’s Current Report on Form 8-K filed May 31, 2011.)
3.4	Second Amended and Restated Bylaws of the Company, adopted July 31, 2014. (Incorporated by reference to the Company’s Current Report on Form 8-K filed August 1, 2014.)
4.1	Form of Common Share Certificate. (Incorporated by reference to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2014.)
4.2	Form of 61/2% Series D Cumulative Convertible Preferred Share Certificate. (Incorporated by reference to the Company’s Annual Report on Form 10-K for the year ended December 31, 2012.)
4.3	Indenture, dated as of July 9, 1997, between the Company and State Street Bank and Trust Company, as Trustee. (Incorporated by reference to the Company’s Annual Report on Form 10-K for the year ended December 31, 1997, File Number 001-09317.)
4.4	Supplemental Indenture No. 17, dated as of June 25, 2007, between the Company and U.S. Bank, relating to the Company’s 6.25% Senior Notes due 2017, including form thereof. (Incorporated by reference to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2007, File Number 001-09317.)
4.5	Supplemental Indenture No. 18, dated as of September 18, 2007, between the Company and U.S. Bank, relating to the Company’s 6.65% Senior Notes due 2018, including form thereof. (Incorporated by reference to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2007, File Number 001-09317.)
4.6	Supplemental Indenture No. 20, dated as of September 17, 2010, between the Company and U.S. Bank, relating to the Company’s 5.875% Senior Notes due 2020, including form thereof. (Incorporated by reference to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2010.)
4.7	Supplemental Indenture No. 21, dated as of July 25, 2012, between the Company and U.S. Bank, relating to the Company’s 5.75% Senior Notes due 2042, including form thereof. (Incorporated by reference to the Company’s Registration Statement on Form 8-A dated July 25, 2012.)
31.1	Rule 13a-14(a) Certification. (Filed herewith.)
31.2	Rule 13a-14(a) Certification. (Filed herewith.)
32.1	Section 1350 Certification. (Furnished herewith.)
101.1	The following materials from the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2016, formatted in XBRL (eXtensible Business Reporting Language): (i) the Condensed Consolidated Balance Sheets, (ii) the Condensed Consolidated Statements of Operations, (iii) the Condensed Consolidated Statements of Comprehensive Income, (iv) the Condensed Consolidated Statements of Cash Flows and (v) related notes to these condensed consolidated financial statements, tagged as blocks of text and in detail. (Filed herewith.)

39

SIGNATURES

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

EQUITY COMMONWEALTH
By:	/s/ David A. Helfand
	David A. Helfand
	President and Chief Executive Officer
	Dated:  November 3, 2016
By:	/s/ Adam S. Markman
	Adam S. Markman
	Executive Vice President, Chief Financial Officer and Treasurer
	Dated:  November 3, 2016

40

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO EXCHANGE ACT RULES 13a-14(a) AND 15d-14(a)

I, David A. Helfand, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Equity Commonwealth;

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:	November 3, 2016	/s/ David A. Helfand
		David A. Helfand
		President and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATION PURSUANT TO EXCHANGE ACT RULES 13a-14(a) AND 15d-14(a)

I, Adam S. Markman, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Equity Commonwealth;

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:	November 3, 2016	/s/Adam S. Markman
		Adam S. Markman
		Executive Vice President, Chief
		Financial Officer and Treasurer

EX-32.1

Exhibit 32.1

Certification Pursuant to 18 U.S.C. Sec. 1350

In connection with the filing by Equity Commonwealth (the “Company”) of the Quarterly Report on Form 10-Q for the period ended September 30, 2016 (the “Report”), each of the undersigned hereby certifies, to the best of his knowledge:

1) The Report fully complies with the requirements of Section 13(a) or 15(d) 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.

/s/ David A. Helfand	/s/ Adam S. Markman
David A. Helfand	Adam S. Markman
President and Chief Executive Officer	Executive Vice President, Chief Financial Officer
	and Treasurer
Date:  November 3, 2016

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 27, 2016
Document and Entity Information
Entity Registrant Name	Equity Commonwealth
Entity Central Index Key	0000803649
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		125,532,523
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Real estate properties:
Land	$ 293,225	$ 389,410
Buildings and improvements	2,642,588	3,497,942
Total real estate properties, at cost, gross	2,935,813	3,887,352
Accumulated depreciation	(751,882)	(898,939)
Total real estate properties, at cost, net	2,183,931	2,988,413
Properties held for sale	13,463	0
Acquired real estate leases, net	52,017	88,760
Cash and cash equivalents	2,405,174	1,802,729
Restricted cash	36,755	32,245
Rents receivable, net of allowance for doubtful accounts of $4,515 and $7,715, respectively	150,728	174,676
Other assets, net	123,699	144,341
Total assets	4,965,767	5,231,164
LIABILITIES AND SHAREHOLDERS’ EQUITY
Senior unsecured debt, net	1,313,267	1,450,606
Mortgage notes payable, net	243,993	246,510
Liabilities related to properties held for sale	667	0
Accounts payable and accrued expenses	87,003	123,587
Assumed real estate lease obligations, net	2,140	4,296
Rent collected in advance	21,529	27,340
Security deposits	8,128	10,338
Total liabilities	1,676,727	1,862,677
Preferred shares of beneficial interest, $0.01 par value: 50,000,000 shares authorized;
Series D preferred shares; 6 1/2% cumulative convertible; 4,915,196 shares issued and outstanding, aggregate liquidation preference of $122,880	119,263	119,263
Series E preferred shares; 7 1/4% cumulative redeemable on or after May 15, 2016; 0 and 11,000,000 shares issued and outstanding, respectively, aggregate liquidation preference $0 and $275,000, respectively	0	265,391
Common shares of beneficial interest, $0.01 par value: 350,000,000 shares authorized; 125,532,523 and 126,349,914 shares issued and outstanding, respectively	1,255	1,263
Additional paid in capital	4,402,927	4,414,611
Cumulative net income	2,554,343	2,333,709
Cumulative other comprehensive loss	(1,117)	(3,687)
Cumulative common distributions	(3,111,868)	(3,111,868)
Cumulative preferred distributions	(675,763)	(650,195)
Total shareholders’ equity	3,289,040	3,368,487
Total liabilities and shareholders’ equity	$ 4,965,767	$ 5,231,164

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Rents receivable, allowance for doubtful accounts	$ 4,515	$ 4,515	$ 7,715
Common shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common shares of beneficial interest, shares authorized (in shares)	350,000,000	350,000,000	350,000,000
Common shares of beneficial interest, shares issued (in shares)	125,532,523	125,532,523	126,349,914
Common shares of beneficial interest, shares outstanding (in shares)	125,532,523	125,532,523	126,349,914
Series D
Preferred shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Preferred shares of beneficial interest, shares authorized (in shares)	50,000,000	50,000,000	50,000,000
Preferred shares, dividend yield	6.50%	6.50%	6.50%
Preferred shares of beneficial interest, shares issued (in shares)	4,915,196	4,915,196	4,915,196
Preferred shares, of beneficial interest, shares outstanding (in shares)	4,915,196	4,915,196	4,915,196
Preferred shares, aggregate liquidation preference	$ 122,880	$ 122,880	$ 122,880
Series E
Preferred shares of beneficial interest, par value (in dollars per share)	$ 0	$ 0	$ 0.01
Preferred shares of beneficial interest, shares authorized (in shares)	0	0	50,000,000
Preferred shares, dividend yield		0.00%	7.25%
Preferred shares of beneficial interest, shares issued (in shares)	0	0	11,000,000
Preferred shares, of beneficial interest, shares outstanding (in shares)	0	0	11,000,000
Preferred shares, aggregate liquidation preference	$ 0	$ 0	$ 275,000

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Rental income	$ 92,722	$ 125,459	$ 324,345	$ 457,128
Tenant reimbursements and other income	21,910	33,749	72,789	118,829
Total revenues	114,632	159,208	397,134	575,957
Expenses:
Operating expenses	49,313	73,571	157,964	261,128
Depreciation and amortization	29,184	40,522	102,766	156,858
General and administrative	13,277	16,249	38,766	43,718
Loss on asset impairment	0	0	43,736	17,162
Total expenses	91,774	130,342	343,232	478,866
Operating income	22,858	28,866	53,902	97,091
Interest and other income	3,013	637	7,184	4,813
Interest expense (including net amortization of debt discounts, premiums and deferred financing fees of $948, $171, $2,880 and $23, respectively)	(21,427)	(25,111)	(65,074)	(82,926)
(Loss) gain on early extinguishment of debt	0	(3,887)	(118)	6,111
Foreign currency exchange loss	0	(9,809)	(5)	(8,953)
Gain on sale of properties	82,169	39,793	225,210	42,953
Income before income taxes	86,613	30,489	221,099	59,089
Income tax expense	(225)	(23)	(465)	(2,377)
Net income	86,388	30,466	220,634	56,712
Preferred distributions	(1,997)	(6,981)	(15,959)	(20,943)
Excess fair value of consideration paid over carrying value of preferred shares	0	0	(9,609)	0
Net income attributable to Equity Commonwealth common shareholders	$ 84,391	$ 23,485	$ 195,066	$ 35,769
Weighted average common shares outstanding — basic (in shares)	125,533	128,739	125,627	129,386
Weighted average common shares outstanding — diluted (in shares)	126,568	129,878	127,009	130,093
Earnings per common share attributable to Equity Commonwealth common shareholders:
Basic (in USD per share)	$ 0.67	$ 0.18	$ 1.55	$ 0.28
Diluted (in USD per share)	$ 0.67	$ 0.18	$ 1.54	$ 0.27

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Amortization of debt discounts, premiums and deferred financing fees	$ 948	$ 171	$ 2,880	$ 23

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 86,388	$ 30,466	$ 220,634	$ 56,712
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on derivative instruments and other assets	1,117	821	2,570	(843)
Foreign currency translation adjustments	0	0	0	48,917
Total comprehensive income	$ 87,505	$ 31,287	$ 223,204	$ 104,786

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 220,634	$ 56,712
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	79,128	117,239
Net amortization of debt discounts, premiums and deferred financing fees	2,880	23
Straight line rental income	(12,384)	(3,512)
Amortization of acquired real estate leases	18,289	28,386
Other amortization	11,219	17,224
Share-based compensation	13,871	11,765
Loss on asset impairment	43,736	17,162
Loss (gain) on early extinguishment of debt	118	(6,111)
Foreign currency exchange loss	5	8,953
Net gain on sale of properties	(225,210)	(42,953)
Change in assets and liabilities:
Restricted cash	(6,119)	(6,275)
Rents receivable and other assets	(20,474)	(46,607)
Accounts payable and accrued expenses	(5,303)	(5,769)
Rent collected in advance	(3,912)	(6,112)
Security deposits	234	1,298
Cash provided by operating activities	116,712	141,423
CASH FLOWS FROM INVESTING ACTIVITIES:
Real estate improvements	(92,106)	(43,396)
Principal payments received from direct financing lease	0	5,717
Proceeds from sale of properties, net	1,034,403	1,425,590
Proceeds from sale of securities	0	27,068
Decrease (increase) in restricted cash	1,609	(3,238)
Cash provided by investing activities	943,906	1,411,741
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase and retirement of common shares	(25,563)	(87,983)
Redemption of preferred shares	(275,000)	0
Payments on borrowings	(141,591)	(142,868)
Deferred financing fees	(52)	(7,143)
Distributions to preferred shareholders	(15,959)	(20,943)
Cash used in financing activities	(458,165)	(258,937)
Effect of exchange rate changes on cash	(8)	(9,581)
Increase in cash and cash equivalents	602,445	1,284,646
Cash and cash equivalents at beginning of period	1,802,729	364,516
Cash and cash equivalents at end of period	2,405,174	1,649,162
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	69,373	93,598
Taxes paid	103	5,853
NON-CASH INVESTING ACTIVITIES:
Increase (decrease) in capital expenditures recorded as liabilities	$ 3,191	$ (9,753)

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Basis of Presentation

9 Months Ended

Sep. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying condensed consolidated financial statements of EQC have been prepared without audit.  Certain information and footnote disclosures required by U.S. generally accepted accounting principles, or GAAP, for complete financial statements have been condensed or omitted.  We believe the disclosures made are adequate to make the information presented not misleading.  However, the accompanying condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes contained in our Annual Report on Form 10-K (Annual Report) for the year ended December 31, 2015.  Capitalized terms used, but not defined in this Quarterly Report, have the same meanings as in our Annual Report.

In the opinion of our management, all adjustments, which include only normal recurring adjustments considered necessary for a fair presentation, have been included.  All intercompany transactions and balances with or among our subsidiaries have been eliminated.  Operating results for interim periods are not necessarily indicative of the results that may be expected for the full year.  Reclassifications have been made to the prior years’ financial statements to conform to the current year’s presentation.

The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect reported amounts.  Actual results could differ from those estimates.  Significant estimates in the condensed consolidated financial statements include the allowance for doubtful accounts, purchase price allocations, useful lives of fixed assets and impairment of real estate and intangible assets.

Share amounts are presented in whole numbers, except where noted.

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Recent Accounting Pronouncements

9 Months Ended

Sep. 30, 2016

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In August 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. This update is effective for fiscal years beginning after December 15, 2017, and for interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. We are currently in the process of evaluating the impact, if any, the adoption of this ASU will have on our condensed consolidated financial statements.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which requires more timely recognition of credit losses associated with financial assets. This update is effective for fiscal years beginning after December 15, 2019, and for interim periods within those fiscal years. Early adoption is permitted for fiscal years, and interim periods within those years, beginning after December 15, 2018. We are currently in the process of evaluating the impact, if any, the adoption of this ASU will have on our condensed consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which simplifies several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. This update is effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods, but early adoption is permitted. We are currently in the process of evaluating the impact the adoption of this ASU will have on our condensed consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases, which amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets. The ASU also requires lessees or lessors to capitalize only initial direct costs of leases. This update is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, but early adoption is permitted. We are currently in the process of evaluating the impact the adoption of this ASU will have on our condensed consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which provides guidance for revenue recognition. This update is effective for interim and annual reporting periods beginning after December 15, 2017.  We are currently in the process of evaluating the impact, if any, the adoption of this ASU will have on our condensed consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs. This standard amends existing guidance to require the presentation of debt issuance costs in the balance sheet as a deduction from the carrying amount of the related debt liability instead of as a deferred charge. It is effective for annual reporting periods beginning after December 15, 2015, but early adoption is permitted. We adopted this standard on January 1, 2016 and made the following reclassifications to the prior years' consolidated balance sheet to conform to the current year's presentation (in thousands):

Balance Sheet as of December 31, 2015	Originally Reported	Effect of Change		As Adjusted
Other assets, net	157,549	(13,208	)	144,341
Senior unsecured debt, net	1,460,592	(9,986	)	1,450,606
Mortgage notes payable, net	249,732	(3,222	)	246,510

In April 2014, the FASB issued ASU No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, or ASU 2014-08.  ASU 2014-08 changes the criteria for reporting a discontinued operation.  Under the new pronouncement, a disposal of a part of an organization that has a major effect on its operations and financial results is a discontinued operation.  We adopted ASU 2014-08 on January 1, 2015, and determined that our 2016 dispositions, 2015 dispositions and properties held for sale as of September 30, 2016 do not individually represent a strategic shift, as defined by the standard, that has or will have a major effect on our operations and financial results. As a result, the 2016 and 2015 dispositions and properties held for sale have not been presented as discontinued operations in the statements of operations.

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Real Estate Properties

9 Months Ended

Sep. 30, 2016

Real Estate [Abstract]

Real Estate Properties

Real Estate Properties

During the nine months ended September 30, 2016 and 2015, we made improvements, excluding tenant-funded improvements, to our properties totaling $88.5 million and $46.7 million, respectively.

Properties Held For Sale:

We classify all properties that meet the criteria outlined in the Property, Plant and Equipment Topic of the FASB Accounting Standards Codification (Codification) as held for sale on our condensed consolidated balance sheets.  As of December 31, 2015, we had no properties classified as held for sale. As of September 30, 2016, we classified the following property as held for sale (dollars in thousands):

Asset	Date Sold	Number of Properties	Number of Buildings	Square Footage	Gross Sales Price
7800 Shoal Creek Boulevard	October 2016	1	4	151,917	$	29,210

Summarized balance sheet information for the property classified as held for sale is as follows (in thousands):

	September 30, 2016
Real estate properties	$	12,952
Other assets, net	511
Properties held for sale	$	13,463
Accounts payable and accrued expenses	$	337
Rent collected in advance	19
Security deposits	311
Liabilities related to properties held for sale	$	667

Property Dispositions:

During the nine months ended September 30, 2016, we sold the following properties (dollars in thousands):

Asset	Date Sold	Number of Properties	Number of Buildings	Square Footage	Gross Sales Price		Gain (Loss) on Sale
Properties
Executive Park	February 2016	1	9	427,443	$	50,865	$	16,531
3330 N Washington Boulevard	March 2016	1	1	55,719	11,250		5,455
111 East Kilbourn Avenue	March 2016	1	1	373,669	60,500		14,677
1525 Locust Street	April 2016	1	1	98,009	17,700		8,956
633 Ahua Street	April 2016	1	1	93,141	29,000		15,963
Lakewood on the Park	May 2016	1	2	180,558	37,100		13,616
Leased Land	June 2016	1	7	—	48,450		15,914
9110 East Nichols Avenue	June 2016	1	1	143,958	17,200		642
111 River Street(1)	July 2016	1	1	566,215	235,000		78,240
Sky Park Centre	July 2016	1	2	63,485	13,700		4,745
Raintree Industrial Park	July 2016	1	12	563,182	11,500		(653		)
8701 N Mopac	August 2016	1	1	121,901	21,500		8,394
Portfolios of properties
812 San Antonio Street	May 2016	1	1	59,321
1601 Rio Grande Street	May 2016	1	1	56,219
Downtown Austin portfolio		2	2	115,540	$	32,600	$	20,584
785 Schilinger Road South	June 2016	1	1	72,000
401 Vine Street	June 2016	1	1	53,980
633 Frazier Drive	June 2016	1	1	150,000
9840 Gateway Boulevard North	June 2016	1	1	72,000
3003 South Expressway 281	June 2016	1	1	150,000
1331 North Center Parkway	June 2016	1	1	53,980
Movie theater portfolio		6	6	551,960	$	109,100	$	30,595
128 Crews Drive	July 2016	1	1	185,600
111 Southchase Boulevard	July 2016	1	1	168,087
1043 Global Avenue	July 2016	1	1	450,000
South Carolina industrial portfolio		3	3	803,687	$	30,000	$	7,244
100 East Wisconsin Avenue	August 2016	1	1	435,067
111 Monument Circle	August 2016	1	2	1,121,764
101-115 W. Washington Street	August 2016	1	1	634,058
North Point Office Complex	August 2016	1	2	873,335
Midwest portfolio		4	6	3,064,224	$	416,900	$	(15,808	)
		27	56	7,222,691	$	1,142,365	$	225,095

(1) Property sale represented a leasehold interest. 

During the year ended December 31, 2015, we disposed of 91 properties (135 buildings) and one land parcel with a combined 18.9 million square feet for an aggregate gross sales price of $2.0 billion, excluding closing costs.

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Real Estate Mortgages Receivable

9 Months Ended

Sep. 30, 2016

Mortgage Loans on Real Estate [Abstract]

Real Estate Mortgages Receivable

Real Estate Mortgages Receivable

As of September 30, 2016 and December 31, 2015, we had total real estate mortgages receivable with an aggregate carrying value of $8.1 million included in other assets in our condensed consolidated balance sheets.  We provided mortgage financing totaling $7.7 million at 6.0% per annum in connection with our sale of three suburban office and industrial properties (18 buildings) in January 2013 in Dearborn, MI; this real estate mortgage requires monthly interest payments and matures on January 24, 2023.  We also provided mortgage financing totaling $0.4 million at 6.0% per annum in connection with our sale of a suburban office property in Salina, NY in April 2012. This real estate mortgage requires monthly interest payments and matures on April 30, 2019.

We monitor the payment history of the borrowers and have determined that no allowance for losses related to these real estate mortgages receivable was necessary at September 30, 2016, and December 31, 2015.

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Indebtedness

9 Months Ended

Sep. 30, 2016

Debt Disclosure [Abstract]

Indebtedness

Indebtedness

Unsecured Revolving Credit Facility and Term Loan:

We are party to a credit agreement pursuant to which the lenders agreed to provide a $750.0 million unsecured revolving credit facility, a $200.0 million5-year term loan facility, and a $200.0 million7-year term loan facility. The revolving credit facility has a scheduled maturity date of January 28, 2019, which maturity date may be extended for up to two additional periods of six months at our option subject to satisfaction of certain conditions and the payment of an extension fee of 0.075% of the aggregate amount available under the revolving credit facility. The 5-year term loan and the 7-year term loan have scheduled maturity dates of January 28, 2020 and January 28, 2022, respectively.

The credit agreement permits us to utilize up to $100.0 million of the revolving credit facility for the issuance of letters of credit. Amounts outstanding under the credit agreement generally may be prepaid at any time without premium or penalty, subject to certain exceptions. We have the right to request increases in the aggregate maximum amount of borrowings available under the revolving credit facility and term loans up to an additional $1.15 billion, subject to certain conditions.

Borrowings under the 5-year term loan and 7-year term loan will, subject to certain exceptions, bear interest at a LIBOR rate plus a margin of 90 to 180 basis points for the 5-year term loan and 140 to 235 basis points for the 7-year term loan, in each case depending on our credit rating. Borrowings under the revolving credit facility will, subject to certain exceptions, bear interest at a rate equal to, at our option, either a LIBOR rate or a base rate plus a margin of 87.5 to 155 basis points for LIBOR rate advances and 0 to 55 basis points for base rate advances, in each case depending on our credit rating. In addition, we are required to pay a facility fee of 12.5 to 30 basis points, depending on our credit rating, on the borrowings available under the revolving credit facility, whether or not utilized.

Borrowings under our revolving credit facility currently bear interest at LIBOR plus a spread, which was 125 basis points as of September 30, 2016.  As of September 30, 2016, the interest rate payable on borrowings under our revolving credit facility was 1.78%.  As of September 30, 2016, we had no balance outstanding and $750.0 million available under our revolving credit facility and the facility fee as of September 30, 2016 was 0.25%. Our term loans currently bear interest at a rate of LIBOR plus a spread, which was 140 and 180 basis points for the 5-year and 7-year term loan, respectively, as of September 30, 2016.  As of September 30, 2016, the interest rates for the amounts outstanding under our 5-year term loan and 7-year term loan were 1.93% and 2.33%, respectively.  As of September 30, 2016, we had $200.0 million outstanding under each of our 5-year and 7-year term loans.

Debt Covenants:

Our public debt indenture and related supplements and our credit agreement contain a number of financial and other covenants, including covenants that restrict our ability to incur indebtedness or to make distributions under certain circumstances and require us to maintain financial ratios and a minimum net worth.  At September 30, 2016, we believe we were in compliance with all of our respective covenants under our public debt indenture and related supplements and our credit agreement.

Senior Unsecured Notes:

At September 30, 2016, we had senior unsecured notes of $925.0 million (excluding net discounts and unamortized deferred financing fees) maturing from 2017 through 2042.

On February 16, 2016, we redeemed at par $139.1 million of our 6.25% senior unsecured notes due 2016 and recognized a loss on early extinguishment of debt of $0.1 million from the write-off of an unamortized discount and unamortized deferred financing fees for the nine months ended September 30, 2016.

Mortgage Notes Payable:

At September 30, 2016, five of our properties (8 buildings) with an aggregate net book value of $293.3 million had secured mortgage notes totaling $244.0 million (including net premiums and unamortized deferred financing fees) maturing from 2017 through 2026.

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Shareholders' Equity

9 Months Ended

Sep. 30, 2016

Stockholders' Equity Note [Abstract]

Shareholders' Equity

Shareholders’ Equity

Common Share Issuances:

See Note 10 for information regarding equity issuances related to share-based compensation.

Common Share Repurchases:

On August 24, 2015, our Board of Trustees approved a common share repurchase plan, which authorizes the repurchase of up to $100.0 million of our outstanding common shares over the twelve month period following the date of authorization. On September 14, 2015, our Board of Trustees authorized the repurchase of up to an additional $100.0 million of our outstanding common shares over the twelve month period following the date of authorization. On March 17, 2016, our Board of Trustees authorized the repurchase of up to an additional $150.0 million of our outstanding common shares over the twelve month period following the date of authorization. During the nine months ended September 30, 2016, we purchased and retired 983,789 of our common shares at a weighted average price of $25.94 per share, for a total of $25.5 million. Since the inception of the common share repurchase plan through September 30, 2016, we have purchased and retired a total of 4,394,089 of our common shares at a weighted average price of $25.80 per share, for a total of $113.4 million. In August and September 2016, the first two share repurchase authorizations, of which $86.6 million was not utilized, expired. The $150.0 million of remaining authorization available under our share repurchase program as of September 30, 2016 is scheduled to expire in March 2017.

Preferred Share Redemption:

On May 15, 2016, we redeemed all of our 11,000,000 outstanding series E preferred shares at a price of $25.00 per share, for a total of $275.0 million, plus any accrued and unpaid dividends. The redemption payment occurred on May 16, 2016 (the first business day following the redemption date). We recorded $9.6 million related to the excess fair value of consideration paid over the carrying value of the preferred shares as a reduction to net income attributable to common shareholders for the nine months ended September 30, 2016.

Preferred Share Distributions:

In 2016, our Board of Trustees declared distributions on our series D preferred shares and series E cumulative redeemable preferred shares to date as follows:

Declaration Date	Record Date	Payment Date	Series D Dividend Per Share		Series E Dividend Per Share
January 26, 2016	February 5, 2016	February 16, 2016	$	0.40625	$	0.453125
April 15, 2016	April 25, 2016	May 16, 2016	$	0.40625	$	0.453125
July 11, 2016	July 29, 2016	August 15, 2016	$	0.40625	$	—
October 10, 2016	October 28, 2016	November 15, 2016	$	0.40625	$	—

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Cumulative Other Comprehensive Loss

9 Months Ended

Sep. 30, 2016

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Cumulative Other Comprehensive Loss

Cumulative Other Comprehensive Loss

The following tables present the amounts recognized in cumulative other comprehensive loss for the three and nine months ended September 30, 2016 (in thousands):

	Unrealized Loss on Derivative Instruments
Balance as of July 1, 2016	$	(2,234	)
Other comprehensive income before reclassifications	23
Amounts reclassified from cumulative other comprehensive loss to net income	1,094
Net current period other comprehensive income	1,117
Balance as of September 30, 2016	$	(1,117	)

	Unrealized Loss on Derivative Instruments
Balance as of January 1, 2016	$	(3,687	)
Other comprehensive loss before reclassifications	(748		)
Amounts reclassified from cumulative other comprehensive loss to net income	3,318
Net current period other comprehensive income	2,570
Balance as of September 30, 2016	$	(1,117	)

The following table presents reclassifications out of cumulative other comprehensive loss for the three and nine months ended September 30, 2016 (in thousands):

	Amounts Reclassified from Cumulative Other Comprehensive Loss to Net Income
Details about Cumulative Other Comprehensive Loss Components	Three Months Ended September 30, 2016		Nine Months Ended September 30, 2016		Affected Line Items in the Statement of Operations
Interest rate swap contracts	$	1,094	$	3,318	Interest expense

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Income Taxes

9 Months Ended

Sep. 30, 2016

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

We have elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended, and are generally not subject to federal and state income taxes provided we distribute a sufficient amount of our taxable income to our shareholders and meet other requirements for qualifying as a REIT.  We are also subject to certain state and local taxes without regard to our REIT status. In prior periods, we were subject to Australian taxes. 

Our provision for income taxes consists of the following (in thousands):

	Three Months Ended September 30,					Nine Months Ended September 30,
	2016		2015			2016		2015
Current:
State	$	225	$	90		$	465	$	270
Federal	—		—			—		525
Foreign	—		(67		)	—		2,337
	225		23			465		3,132
Deferred:
Foreign	—		—			—		(755		)
	—		—			—		(755		)
Income tax expense	$	225	$	23		$	465	$	2,377

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Derivative Instruments

9 Months Ended

Sep. 30, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

Derivative Instruments

Risk Management Objective of Using Derivatives

We are exposed to certain risks relating to our ongoing business operations, including the effect of changes in interest rates.  The only risk we currently manage by using derivative instruments is related to our interest rate risk. 

We may use derivative financial instruments, including interest rate swaps, caps, options, floors and other interest rate derivative contracts, to hedge all or a portion of the interest rate risk associated with our borrowings. The principal objective of such arrangements is to minimize the risks and/or costs associated with our operating and financial structure as well as to hedge specific anticipated transactions. We do not intend to utilize derivatives for speculative or other purposes other than interest rate risk management. The use of derivative financial instruments carries certain risks, including the risk that the counterparties to these contractual arrangements are not able to perform under the agreements. To mitigate this risk, we only enter into derivative financial instruments with counterparties with high credit ratings or with major financial institutions with which we and our affiliates may also have other financial relationships. We do not anticipate that any of the counterparties will fail to meet their obligations.

Cash Flow Hedges of Interest Rate Risk

Our objectives in using interest rate derivatives are to add stability to interest expense and to manage our exposure to interest rate movements. To accomplish this objective, we periodically use interest rate swaps, caps, or other similar instruments as part of our 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 us making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in cumulative other comprehensive loss and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During 2016, such derivatives were used to hedge the variable cash flows associated with variable-rate debt. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings.

Amounts reported in cumulative other comprehensive loss related to derivatives will be reclassified to interest expense as interest payments are made on our variable-rate debt. During the next twelve months, we estimate that an additional $0.7 million will be reclassified from cumulative other comprehensive loss as an increase to interest expense.

We have interest rate swap agreements to manage our interest rate risk exposure on $168.1 million of mortgage debt due 2019, which require interest at a spread over LIBOR.  The interest rate swap agreements utilized by us qualify as cash flow hedges and effectively modify our exposure to interest rate risk by converting our floating interest rate debt to a fixed interest rate basis for this loan through December 1, 2016, thus reducing the impact of interest rate changes on future interest expense. 

On March 4, 2016, we purchased an interest rate cap with a LIBOR strike price of 2.50%. The interest rate cap, effective April 1, 2016, has a notional amount of $400.0 million and a maturity date of March 1, 2019.

As of September 30, 2016, we had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk:

Interest Rate Derivative	Number of Instruments	Notional Amount (in thousands)
Interest rate swap	2	$	168,103
Interest rate cap	1	$	400,000

The table below presents the fair value of our derivative financial instruments as well as their classification on the condensed consolidated balance sheets as of September 30, 2016 and December 31, 2015 (amounts in thousands):

		Fair Value as of
Interest Rate Derivative Designated as Hedging Instrument	Balance Sheet Location	September 30, 2016			December 31, 2015
Pay-fixed swaps	Accounts payable and accrued expenses	$	(707	)	$	(3,687	)
Interest rate cap	Other assets	$	112		$	—

The table below details the location in the financial statements of the gain or loss recognized on interest rate derivatives designated as cash flow hedges for the three and nine months ended September 30, 2016 and 2015 (amounts in thousands):

	Three Months Ended September 30,					Nine Months Ended September 30,
	2016		2015			2016			2015
Amount of gain (loss) recognized in cumulative other comprehensive loss	$	23	$	(418	)	$	(748	)	$	(1,378	)
Amount of loss reclassified from cumulative other comprehensive loss into interest expense	1,094		1,239			3,318			3,698

Credit-risk-related Contingent Features

Our agreements with each of our derivative counterparties contain a provision providing that if we default or are capable of being declared in default on any of our indebtedness, we could also be declared in default on our derivative obligations.

As of September 30, 2016, the fair value of derivatives in a net liability position including accrued interest but excluding any adjustment for nonperformance risk related to these agreements was $1.1 million. As of September 30, 2016, we have not posted any collateral related to these agreements and were not in breach of any agreement provisions. If we had breached any of these provisions, we could have been required to settle our obligations under the agreements at their aggregate termination value of $1.1 million at September 30, 2016.

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Share-Based Compensation

9 Months Ended

Sep. 30, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation

Share-Based Compensation

Equity Commonwealth 2015 Omnibus Incentive Plan

On January 26, 2016, the Board of Trustees approved an amendment to the 2015 Omnibus Incentive Plan (as amended, the 2015 Incentive Plan) to allow the Compensation Committee (Committee) to authorize in an award agreement a transfer of all or a part of certain equity awards not for value to a “family member” (as defined in the 2015 Incentive Plan).

Recipients of the Company’s restricted shares have the same voting rights as any other common shareholder. During the period of restriction, the Company’s unvested restricted shareholders are eligible to receive dividend payments on their shares at the same rate and on the same date as any other common shareholder. Recipients of the Company’s restricted stock units (RSUs) are entitled to receive dividends with respect to the common shares underlying the RSUs if and when the RSUs are earned, at which time the recipient will be entitled to receive an amount in cash equal to the aggregate amount of cash dividends that would have been paid in respect of the common shares underlying the recipient’s earned RSUs had such common shares been issued to the recipient on the first day of the performance period. To the extent that an award does not vest, the dividends will be forfeited.

2016 Equity Award Activity

On June 16, 2016, in accordance with the Company’s compensation plan for independent Trustees, the Committee awarded each of the nine independent Trustees $0.1 million in restricted shares as part of their compensation for the 2016-2017 year of service on the Board of Trustees. These awards equated to 3,463 shares per Trustee, for a total of 31,167 shares, valued at $28.88 per share, the closing price of our common shares on the New York Stock Exchange (NYSE) on that day. These shares vest one year after the date of the award.

On January 26, 2016, the Committee approved a grant of 136,623 restricted common shares and 277,386 RSUs at target to the Company’s officers, certain employees and to Mr. Zell, the Chairman of our Board of Trustees, as part of their compensation for fiscal year 2015.  

The restricted shares are service based awards and vest over a four-year period. The restricted shares were granted on January 26, 2016 and were valued at $26.93 per share, the closing price of our common shares on the NYSE on that day.

The RSUs are market based awards with a service condition and recipients may earn the RSU grants based on the Company’s total shareholder return (TSR) relative to the TSR's for the constituent REITs that comprise the NAREIT Office Index for the performance period of January 26, 2016 - January 26, 2019. Following the end of the performance period on January 26, 2019, the number of earned awards will be determined. The earned awards vest in two tranches with 50% of the earned award vesting on January 26, 2019 and the remaining 50% of the earned award vesting on January 26, 2020, subject to the grant recipient’s continued employment. Compensation expense for the RSU awards was determined using a Monte Carlo simulation model and is being recognized ratably from the grant date to the vesting date of each tranche.

During the nine months ended September 30, 2016, due to employee departures, 539 restricted shares were forfeited with an average price per share value at grant date of $26.82, and 1,094 RSUs were forfeited with an average per share fair value at grant date of $38.72.

2015 Equity Award Activity

On June 16, 2015, in accordance with the Company’s compensation plan for independent Trustees, the Committee awarded each of the nine independent Trustees $0.1 million in restricted shares as part of their compensation for the 2015-2016 year of service on the Board of Trustees. These awards equated to 3,843 shares per Trustee, for a total of 34,587 shares, valued at $26.02 per share, the closing price of our common shares on the NYSE on that day. These shares vested one year after the date of the award.

On January 28, 2015, the Committee approved a grant of 126,319 restricted common shares and 256,467 RSUs at target to the Company’s officers, certain employees and to Mr. Zell, the Chairman of our Board of Trustees, as part of their compensation for fiscal year 2014.  

The restricted shares are service based awards and vest over a four-year period. The restricted shares were granted on January 28, 2015 and were valued at $26.58 per share, the closing price of our common shares on the NYSE on that day.

The RSUs are market based awards with a service condition and recipients may earn the RSU grants based on the Company’s total shareholder return (TSR) relative to the TSR's for the constituent REITs that comprise the NAREIT Office Index for the performance period of January 28, 2015 - January 28, 2018. Following the end of the performance period on January 28, 2018, the number of earned awards will be determined. The earned awards vest in two tranches with 50% of the earned award vesting on January 28, 2018 and the remaining 50% of the earned award vesting on January 28, 2019, subject to the grant recipient’s continued employment. Compensation expense for the RSU awards was determined using a Monte Carlo simulation model and is being recognized ratably from the grant date to the vesting date of each tranche.

During the nine months ended September 30, 2015, 8,115 restricted shares were forfeited with an average per share fair value at grant date of $26.64, and 16,475 RSUs were forfeited with an average per share fair value at grant date of $20.50.

Outstanding Equity Awards

As of September 30, 2016, the estimated future compensation expense for all unvested restricted share grants was $14.1 million. Compensation expense for the restricted share awards is being recognized on a straight-line basis over the requisite service period for each separately vesting portion of the award. The weighted average period over which the future compensation expense will be recorded for the restricted shares is approximately 2.3 years.

As of September 30, 2016, the estimated future compensation expense for all unvested RSUs was $22.2 million. The weighted average period over which the future compensation expense will be recorded for the RSUs is approximately 2.2 years.

The assumptions and fair values for the RSUs granted for the nine months ended September 30, 2016 are included in the following table on a per share basis.

	2016
Fair value of RSUs granted	$	38.80
Expected term (years)	4
Expected volatility	—
Expected dividend yield	1.86		%
Risk-free rate	1.07		%

During the three months ended September 30, 2016 and 2015, we recorded $4.9 million and $3.7 million, respectively, and during the nine months ended September 30, 2016 and 2015, we recorded $13.9 million and $11.8 million, respectively, of compensation expense, net of forfeitures, in general and administrative expense for grants to our Board of Trustees and the Company's employees related to our Plan. At September 30, 2016, 2,358,464 common shares remain available for issuance under the Plan.

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Fair Value of Assets and Liabilities

9 Months Ended

Sep. 30, 2016

Fair Value Disclosures [Abstract]

Fair Value of Assets and Liabilities

Fair Value of Assets and Liabilities

The table below presents certain of our assets and liabilities measured at fair value during 2016, categorized by the level of inputs used in the valuation of each asset and liability (dollars in thousands):

				Fair Value at September 30, 2016 Using
				Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs			Significant Unobservable Inputs
Description	Total			(Level 1)		(Level 2)			(Level 3)
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	$	(707	)	$	—	$	(707	)	$	—
Effective portion of interest rate cap contract	112			—		112			—

Effective Portion of Interest Rate Swap and Cap Contracts

The fair value of our interest rate swap and cap contracts is determined using the net discounted cash flows of each derivative based on the market based interest rate curve (level 2 inputs) and adjusted for our credit spread and the actual and estimated credit spreads of the counterparties (level 3 inputs).  Although we have determined that the majority of the inputs used to value our derivatives fall within level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize level 3 inputs, such as estimates of current credit spreads, to evaluate the likelihood of default by us and the counterparties.  As of September 30, 2016, we have assessed the significance of the impact of the credit valuation adjustments on the overall valuation of our derivative positions and have determined that the credit valuation adjustments are not significant to the overall valuation of our derivatives.  As a result, we have determined that our derivative valuations in their entirety are classified as level 2 inputs in the fair value hierarchy.

Derivative Liability

On July 31, 2014, our shareholders voted to approve the reimbursement of verified expenses incurred by Related Fund Management, LLC and Corvex Management LP (Related/Corvex) (see Note 14 for additional information). Approximately $16.7 million was paid during the year ended December 31, 2014. Up to $8.4 million was to be reimbursed only if the average closing price of our common shares was at least $26.00 (as adjusted for any share splits or share dividends) during the one year period after the date on which the reimbursement was approved by shareholders, and up to $8.4 million was to be reimbursed only if the average closing price of our common shares was at least $26.00 (as adjusted for any share splits or share dividends) during the one year period between the first and second anniversaries of the date on which the reimbursement was approved by shareholders. The average closing price of our common shares was at least $26.00 during both the first and second one year periods after the date on which the reimbursement was approved by shareholders, and as a result, in August 2016 and 2015 we paid an $8.2 million final payment and $8.4 million, respectively, to Related/Corvex.

Prior to the payment of the reimbursement in August 2016, the potential future reimbursement of $8.4 million for the second one year period represented a derivative instrument as codified in ASC 815 Derivatives and Hedging which required the potential future reimbursement to be recorded at fair value at each reporting date. The fair value of the derivative liability as of September 30, 2016 and December 31, 2015 was $0 and $7.2 million, respectively. We recognized (income) expense of $(0.1) million and $1.0 million for the three and nine months ended September 30, 2016, respectively, which was recorded in general and administrative expenses in our condensed consolidated statement of operations for such periods.

Properties Held and Used

As part of our disposition plan, and pursuant to our accounting policy, in 2016, we evaluated the recoverability of the carrying values of each of the real estate assets that comprised our portfolio and determined that due to the shortening of the expected periods of ownership as a result of the disposition plan and current estimates of market value, it was necessary to reduce the net book value of a portion of the real estate assets in our portfolio to their estimated fair values. We anticipate the potential disposition of certain properties prior to the end of their remaining useful lives. As a result, in the second quarter, we recorded an impairment charge related to 111 Monument Circle, 101-115 W. Washington Street and 100 East Wisconsin Avenue of $43.7 million for the nine months ended September 30, 2016 in accordance with our impairment analysis procedures. We determined these impairments based on third party offer prices and independent third party broker information, which are level 2 inputs according to the fair value hierarchy established in ASC 820. We reduced the aggregate carrying value of these properties from $308.6 million to their estimated fair value of $264.9 million. These properties were sold in August 2016 (see Note 3 for additional information). We evaluated each of our properties and determined there were no additional valuation adjustments necessary at September 30, 2016.

Financial Instruments

In addition to the assets and liabilities described in the above table, our financial instruments include our cash and cash equivalents, real estate mortgages receivable, restricted cash, senior unsecured debt and mortgage notes payable.  At September 30, 2016 and December 31, 2015, the fair value of these additional financial instruments were not materially different from their carrying values, except as follows (in thousands):

	September 30, 2016				December 31, 2015
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Senior unsecured debt and mortgage notes payable, net	$	1,557,260	$	1,618,274	$	1,697,116	$	1,749,211

The fair values of our senior notes and mortgage notes payable are based on estimates using discounted cash flow analyses and currently prevailing interest rates adjusted by credit risk spreads (level 3 inputs).

Our cash and cash equivalents consists of cash maintained in time deposits, depository accounts and money market accounts.  From time-to-time we may also invest in various U.S. government securities.  We continually monitor the credit ratings of the financial institutions holding our deposits to minimize our exposure to credit risk.  Throughout the year, we have cash balances in excess of federally insured limits deposited with various financial institutions. We do not believe we are exposed to any significant credit risk on cash and cash equivalents.

Other financial instruments that potentially subject us to concentrations of credit risk consist principally of rents receivable; however, as of September 30, 2016, no single tenant of ours is responsible for more than 5.5% of our total annualized rents.

Our derivative financial instruments, including interest rate swaps and cap, are entered with major financial institutions and we monitor the amount of credit exposure to any one counterparty.

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Earnings Per Common Share

9 Months Ended

Sep. 30, 2016

Earnings Per Share [Abstract]

Earnings Per Common Share

Earnings Per Common Share

The following table sets forth the computation of basic and diluted earnings per share (amounts in thousands except per share amounts):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Numerator for earnings per common share - basic and diluted:
Net income	$	86,388		$	30,466		$	220,634		$	56,712
Preferred distributions	(1,997		)	(6,981		)	(15,959		)	(20,943		)
Excess fair value of consideration paid over carrying value of preferred shares	—			—			(9,609		)	—
Numerator for net income per share	$	84,391		$	23,485		$	195,066		$	35,769
Denominator for earnings per common share - basic and diluted:
Weighted average number of common shares outstanding - basic	125,533			128,739			125,627			129,386
Weighted average number of common shares outstanding - diluted(1)	126,568			129,878			127,009			130,093
Net income per common share attributable to Equity Commonwealth common shareholders:
Basic	$	0.67		$	0.18		$	1.55		$	0.28
Diluted	$	0.67		$	0.18		$	1.54		$	0.27
Anti-dilutive securities:
Effect of Series D preferred shares; 6 1/2% cumulative convertible(2)	2,363			2,363			2,363			2,363

(1) As of September 30, 2016, we had granted RSUs to certain employees, officers, and the chairman of the Board of Trustees.  The RSUs contain both service and market-based vesting components.  None of the RSUs have vested. If the market-based vesting component was measured as of September 30, 2016, and 2015, 1,035 and 1,139 common shares would be issued to the RSU holders, respectively. Using a weighted average basis, 1,035 and 1,139 common shares are reflected in diluted earnings per share for the three months ended September 30, 2016 and 2015, respectively and 1,382 and 707 common shares are reflected in diluted earnings per share for the nine months ended September 30, 2016 and 2015, respectively.

(2) The Series D preferred shares are excluded from the diluted earnings per share calculation because including the Series D preferred shares would also require that the preferred distributions be added back to net income, resulting in anti-dilution during the periods presented.

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Segment Information

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

Segment Information

Segment Information

Our primary business is the ownership and operation of office properties, and we currently have one reportable segment.  Due to significant dispositions, during the fourth quarter of 2015, we changed the composition of our operating segments from two reportable segments (central business district properties and suburban properties) to one reportable segment.  This change was made based on the financial information reviewed and used by the chief operating decision maker to make operating decisions, assess performance, develop strategy and allocate capital resources. More than 95% of our revenues for the nine months ended September 30, 2016 are from office properties.

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Related Person Transactions

9 Months Ended

Sep. 30, 2016

Related Party Transactions [Abstract]

Related Person Transactions

Related Person Transactions

The following discussion includes a description of our related person transactions for the nine months ended September 30, 2016 and 2015.

Related Person Transactions Following the Special Meeting:

Equity Group Investments and associated entities: We have a lease with Two North Riverside Plaza Joint Venture Limited Partnership, an entity associated with Mr. Zell, our Chairman, to occupy office space on the twentieth and twenty-first floors of Two North Riverside Plaza in Chicago, Illinois (20th/21st Floor Office Lease). The initial term of the lease is approximately five years, with one5-year renewal option. We recently completed improvements to the office space utilizing the $0.7 million tenant improvement allowance provided for by the lease. In connection with the 20th/21st Floor Office Lease, we also have a lease with Two North Riverside Plaza Joint Venture Limited Partnership for storage space in the basement of Two North Riverside Plaza. The lease expires December 31, 2020, however each party has the right to terminate on 30 days' prior written notice. During the three and nine months ended September 30, 2016, we recognized expense of $0.2 million and $0.6 million, respectively, pursuant to the 20^th/21^st Floor Office Lease and the related storage space.

We had a license agreement with Equity Group Investments, a private investment firm (Equity Group), to use office space on the sixth floor at Two North Riverside Plaza. The license fee included the non-exclusive use of additional areas on the sixth floor (such as conference rooms and common areas), certain administrative services (such as mail room services and reception desk staffing), office equipment, office furniture, supplies, licensee’s share of building operating expenses and real estate taxes and access to one parking space. Mr. Zell, our Chairman, is the Chairman and Chief Executive Officer of Equity Group, and Mr. Helfand, our President and Chief Executive Officer, is the Co-President of Equity Group. The license agreement was terminated as of December 30, 2015. During the three and nine months ended September 30, 2015, we recognized expense of $46,000 and $0.1 million, respectively, pursuant to the license agreement.

We had a sublease with Equity Residential Management, L.L.C. to occupy office space on the tenth floor of Two North Riverside Plaza. Equity Residential Management, L.L.C. leases the space from Two North Riverside Plaza Joint Venture Limited Partnership. The sublease agreement was terminated as of December 30, 2015. During the three and nine months ended September 30, 2015, we recognized expense of $0.1 million and $0.3 million, respectively, pursuant to the tenth floor office sublease.

Related/Corvex: On July 31, 2014, at the reconvened session of our 2014 annual meeting of shareholders, our shareholders voted to approve the reimbursement of approximately $33.5 million of verified expenses incurred by Related/Corvex since February 2013 in connection with their consent solicitations to remove our former Trustees and elect the new Board of Trustees and to engage in related litigation. Approximately $16.7 million was paid during the year ended December 31, 2014.  Up to $8.4 million was to be reimbursed only if the average closing price of our common shares was at least $26.00 (as adjusted for any share splits or share dividends) during the one year period after the date on which the reimbursement was approved by shareholders, and up to $8.4 million was to be reimbursed only if the average closing price of our common shares was at least $26.00 (as adjusted for any share splits or share dividends) during the one year period between the first and second anniversaries of the date on which the reimbursement was approved by shareholders. The average closing price of our common shares was at least $26.00 during both the first and second one year periods after the date on which the reimbursement was approved by shareholders, and as a result, in August 2016 and 2015 we paid an $8.2 million final payment and $8.4 million, respectively, to Related/Corvex.

Transactions with Prior Related Persons:

Certain related person transactions, and their approvals, relate to Reit Management & Research LLC (RMR) and RMR Australia Asset Management Pty Ltd (together, Former Manager) or occurred prior to the election of our new Board of Trustees at the special meeting of shareholders held on May 23, 2014 (Special Meeting) and the appointment of our current executive officers following the Special Meeting, as described below.

Termination and Cooperation Agreement: On September 30, 2014, we entered into a termination and cooperation agreement (Cooperation Agreement) with Former Manager. Under the terms of the agreement, the existing business and property management agreements with RMR terminated effective September 30, 2014.

Pursuant to the Cooperation Agreement, through February 28, 2015, Former Manager agreed to use best efforts to assist us in the transition of our management and operations. We paid Former Manager $1.2 million per month for transition services from October 1, 2014 to February 28, 2015, which included continued management and other services for the Australian assets pursuant to the Australian Management Agreement. Beginning March 1, 2015, we agreed to pay Former Manager $0.1 million per month until we no longer required such services or until the Australia Management Agreement was terminated, which was terminated in the third quarter of 2015, effective October 31, 2015. There is no future obligation to pay any fees to Former Manager.

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Subsequent Events

9 Months Ended

Sep. 30, 2016

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

In October 2016, we sold one property (four buildings), with 151,917 square feet for $29.2 million, excluding closing costs.  This property was classified as held for sale as of September 30, 2016 (see Note 3).

In October 2016, we purchased a parcel of land adjacent to our Research Park property in Austin, Texas for $2.8 million.

On November 1, 2016, we delivered notice of our intent to redeem at par our $250 million6.25% senior unsecured notes due 2017 on December 15, 2016.  The notes will be redeemed for cash at a price equal to 100% of the principal amount of the notes plus any accrued and unpaid interest up to, but excluding, the redemption date.

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Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying condensed consolidated financial statements of EQC have been prepared without audit.  Certain information and footnote disclosures required by U.S. generally accepted accounting principles, or GAAP, for complete financial statements have been condensed or omitted.  We believe the disclosures made are adequate to make the information presented not misleading.  However, the accompanying condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes contained in our Annual Report on Form 10-K (Annual Report) for the year ended December 31, 2015.  Capitalized terms used, but not defined in this Quarterly Report, have the same meanings as in our Annual Report.

In the opinion of our management, all adjustments, which include only normal recurring adjustments considered necessary for a fair presentation, have been included.  All intercompany transactions and balances with or among our subsidiaries have been eliminated.  Operating results for interim periods are not necessarily indicative of the results that may be expected for the full year.  Reclassifications have been made to the prior years’ financial statements to conform to the current year’s presentation.

The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect reported amounts.  Actual results could differ from those estimates.  Significant estimates in the condensed consolidated financial statements include the allowance for doubtful accounts, purchase price allocations, useful lives of fixed assets and impairment of real estate and intangible assets.

Share amounts are presented in whole numbers, except where noted.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In August 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. This update is effective for fiscal years beginning after December 15, 2017, and for interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. We are currently in the process of evaluating the impact, if any, the adoption of this ASU will have on our condensed consolidated financial statements.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which requires more timely recognition of credit losses associated with financial assets. This update is effective for fiscal years beginning after December 15, 2019, and for interim periods within those fiscal years. Early adoption is permitted for fiscal years, and interim periods within those years, beginning after December 15, 2018. We are currently in the process of evaluating the impact, if any, the adoption of this ASU will have on our condensed consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which simplifies several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. This update is effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods, but early adoption is permitted. We are currently in the process of evaluating the impact the adoption of this ASU will have on our condensed consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases, which amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets. The ASU also requires lessees or lessors to capitalize only initial direct costs of leases. This update is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, but early adoption is permitted. We are currently in the process of evaluating the impact the adoption of this ASU will have on our condensed consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which provides guidance for revenue recognition. This update is effective for interim and annual reporting periods beginning after December 15, 2017.  We are currently in the process of evaluating the impact, if any, the adoption of this ASU will have on our condensed consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs. This standard amends existing guidance to require the presentation of debt issuance costs in the balance sheet as a deduction from the carrying amount of the related debt liability instead of as a deferred charge. It is effective for annual reporting periods beginning after December 15, 2015, but early adoption is permitted. We adopted this standard on January 1, 2016 and made the following reclassifications to the prior years' consolidated balance sheet to conform to the current year's presentation (in thousands):

Balance Sheet as of December 31, 2015	Originally Reported	Effect of Change		As Adjusted
Other assets, net	157,549	(13,208	)	144,341
Senior unsecured debt, net	1,460,592	(9,986	)	1,450,606
Mortgage notes payable, net	249,732	(3,222	)	246,510

In April 2014, the FASB issued ASU No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, or ASU 2014-08.  ASU 2014-08 changes the criteria for reporting a discontinued operation.  Under the new pronouncement, a disposal of a part of an organization that has a major effect on its operations and financial results is a discontinued operation.  We adopted ASU 2014-08 on January 1, 2015, and determined that our 2016 dispositions, 2015 dispositions and properties held for sale as of September 30, 2016 do not individually represent a strategic shift, as defined by the standard, that has or will have a major effect on our operations and financial results. As a result, the 2016 and 2015 dispositions and properties held for sale have not been presented as discontinued operations in the statements of operations.

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Recent Accounting Pronouncements (Tables)

9 Months Ended

Sep. 30, 2016

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

New Accounting Pronouncement

We adopted this standard on January 1, 2016 and made the following reclassifications to the prior years' consolidated balance sheet to conform to the current year's presentation (in thousands):

Balance Sheet as of December 31, 2015	Originally Reported	Effect of Change		As Adjusted
Other assets, net	157,549	(13,208	)	144,341
Senior unsecured debt, net	1,460,592	(9,986	)	1,450,606
Mortgage notes payable, net	249,732	(3,222	)	246,510

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Real Estate Properties (Tables)

9 Months Ended

Sep. 30, 2016

Real Estate [Abstract]

Summary of Properties Held for Sale and Balance Sheet Information for all Properties Classified as Held for sale

As of September 30, 2016, we classified the following property as held for sale (dollars in thousands):

Asset	Date Sold	Number of Properties	Number of Buildings	Square Footage	Gross Sales Price
7800 Shoal Creek Boulevard	October 2016	1	4	151,917	$	29,210

Summarized balance sheet information for the property classified as held for sale is as follows (in thousands):

	September 30, 2016
Real estate properties	$	12,952
Other assets, net	511
Properties held for sale	$	13,463
Accounts payable and accrued expenses	$	337
Rent collected in advance	19
Security deposits	311
Liabilities related to properties held for sale	$	667

Summary of Properties Sold and Income Statement Information for Properties Disposed of

During the nine months ended September 30, 2016, we sold the following properties (dollars in thousands):

Asset	Date Sold	Number of Properties	Number of Buildings	Square Footage	Gross Sales Price		Gain (Loss) on Sale
Properties
Executive Park	February 2016	1	9	427,443	$	50,865	$	16,531
3330 N Washington Boulevard	March 2016	1	1	55,719	11,250		5,455
111 East Kilbourn Avenue	March 2016	1	1	373,669	60,500		14,677
1525 Locust Street	April 2016	1	1	98,009	17,700		8,956
633 Ahua Street	April 2016	1	1	93,141	29,000		15,963
Lakewood on the Park	May 2016	1	2	180,558	37,100		13,616
Leased Land	June 2016	1	7	—	48,450		15,914
9110 East Nichols Avenue	June 2016	1	1	143,958	17,200		642
111 River Street(1)	July 2016	1	1	566,215	235,000		78,240
Sky Park Centre	July 2016	1	2	63,485	13,700		4,745
Raintree Industrial Park	July 2016	1	12	563,182	11,500		(653		)
8701 N Mopac	August 2016	1	1	121,901	21,500		8,394
Portfolios of properties
812 San Antonio Street	May 2016	1	1	59,321
1601 Rio Grande Street	May 2016	1	1	56,219
Downtown Austin portfolio		2	2	115,540	$	32,600	$	20,584
785 Schilinger Road South	June 2016	1	1	72,000
401 Vine Street	June 2016	1	1	53,980
633 Frazier Drive	June 2016	1	1	150,000
9840 Gateway Boulevard North	June 2016	1	1	72,000
3003 South Expressway 281	June 2016	1	1	150,000
1331 North Center Parkway	June 2016	1	1	53,980
Movie theater portfolio		6	6	551,960	$	109,100	$	30,595
128 Crews Drive	July 2016	1	1	185,600
111 Southchase Boulevard	July 2016	1	1	168,087
1043 Global Avenue	July 2016	1	1	450,000
South Carolina industrial portfolio		3	3	803,687	$	30,000	$	7,244
100 East Wisconsin Avenue	August 2016	1	1	435,067
111 Monument Circle	August 2016	1	2	1,121,764
101-115 W. Washington Street	August 2016	1	1	634,058
North Point Office Complex	August 2016	1	2	873,335
Midwest portfolio		4	6	3,064,224	$	416,900	$	(15,808	)
		27	56	7,222,691	$	1,142,365	$	225,095

(1) Property sale represented a leasehold interest.

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Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2016

Stockholders' Equity Note [Abstract]

Schedule of Declared Distributions

In 2016, our Board of Trustees declared distributions on our series D preferred shares and series E cumulative redeemable preferred shares to date as follows:

Declaration Date	Record Date	Payment Date	Series D Dividend Per Share		Series E Dividend Per Share
January 26, 2016	February 5, 2016	February 16, 2016	$	0.40625	$	0.453125
April 15, 2016	April 25, 2016	May 16, 2016	$	0.40625	$	0.453125
July 11, 2016	July 29, 2016	August 15, 2016	$	0.40625	$	—
October 10, 2016	October 28, 2016	November 15, 2016	$	0.40625	$	—

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Cumulative Other Comprehensive Loss (Tables)

9 Months Ended

Sep. 30, 2016

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Amounts Recognized in Cumulative Other Comprehensive Loss

The following tables present the amounts recognized in cumulative other comprehensive loss for the three and nine months ended September 30, 2016 (in thousands):

	Unrealized Loss on Derivative Instruments
Balance as of July 1, 2016	$	(2,234	)
Other comprehensive income before reclassifications	23
Amounts reclassified from cumulative other comprehensive loss to net income	1,094
Net current period other comprehensive income	1,117
Balance as of September 30, 2016	$	(1,117	)

	Unrealized Loss on Derivative Instruments
Balance as of January 1, 2016	$	(3,687	)
Other comprehensive loss before reclassifications	(748		)
Amounts reclassified from cumulative other comprehensive loss to net income	3,318
Net current period other comprehensive income	2,570
Balance as of September 30, 2016	$	(1,117	)

Schedule of Reclassifications Out of Cumulative Other Comprehensive Loss

The following table presents reclassifications out of cumulative other comprehensive loss for the three and nine months ended September 30, 2016 (in thousands):

	Amounts Reclassified from Cumulative Other Comprehensive Loss to Net Income
Details about Cumulative Other Comprehensive Loss Components	Three Months Ended September 30, 2016		Nine Months Ended September 30, 2016		Affected Line Items in the Statement of Operations
Interest rate swap contracts	$	1,094	$	3,318	Interest expense

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Income Taxes (Tables)

9 Months Ended

Sep. 30, 2016

Income Tax Disclosure [Abstract]

Schedule of Provision for Income Taxes

Our provision for income taxes consists of the following (in thousands):

	Three Months Ended September 30,					Nine Months Ended September 30,
	2016		2015			2016		2015
Current:
State	$	225	$	90		$	465	$	270
Federal	—		—			—		525
Foreign	—		(67		)	—		2,337
	225		23			465		3,132
Deferred:
Foreign	—		—			—		(755		)
	—		—			—		(755		)
Income tax expense	$	225	$	23		$	465	$	2,377

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Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Outstanding Interest Rate Derivatives Designated as Cash Flow Hedges of Interest Rate Risk

As of September 30, 2016, we had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk:

Interest Rate Derivative	Number of Instruments	Notional Amount (in thousands)
Interest rate swap	2	$	168,103
Interest rate cap	1	$	400,000

Schedule of Fair Value of Derivative Financial Instruments

The table below presents the fair value of our derivative financial instruments as well as their classification on the condensed consolidated balance sheets as of September 30, 2016 and December 31, 2015 (amounts in thousands):

		Fair Value as of
Interest Rate Derivative Designated as Hedging Instrument	Balance Sheet Location	September 30, 2016			December 31, 2015
Pay-fixed swaps	Accounts payable and accrued expenses	$	(707	)	$	(3,687	)
Interest rate cap	Other assets	$	112		$	—

Schedule of Gain or Loss Recognized on Interest Rate Derivatives Designated as Cash Flow Hedges

The table below details the location in the financial statements of the gain or loss recognized on interest rate derivatives designated as cash flow hedges for the three and nine months ended September 30, 2016 and 2015 (amounts in thousands):

	Three Months Ended September 30,					Nine Months Ended September 30,
	2016		2015			2016			2015
Amount of gain (loss) recognized in cumulative other comprehensive loss	$	23	$	(418	)	$	(748	)	$	(1,378	)
Amount of loss reclassified from cumulative other comprehensive loss into interest expense	1,094		1,239			3,318			3,698

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Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

Restricted stock units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Assumptions and Fair Values for Restricted Stock Units Granted in the Period

The assumptions and fair values for the RSUs granted for the nine months ended September 30, 2016 are included in the following table on a per share basis.

	2016
Fair value of RSUs granted	$	38.80
Expected term (years)	4
Expected volatility	—
Expected dividend yield	1.86		%
Risk-free rate	1.07		%

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Fair Value of Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 2016

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value

The table below presents certain of our assets and liabilities measured at fair value during 2016, categorized by the level of inputs used in the valuation of each asset and liability (dollars in thousands):

				Fair Value at September 30, 2016 Using
				Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs			Significant Unobservable Inputs
Description	Total			(Level 1)		(Level 2)			(Level 3)
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	$	(707	)	$	—	$	(707	)	$	—
Effective portion of interest rate cap contract	112			—		112			—

Schedule of Fair Value and Carrying Value of Financial Instruments

At September 30, 2016 and December 31, 2015, the fair value of these additional financial instruments were not materially different from their carrying values, except as follows (in thousands):

	September 30, 2016				December 31, 2015
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Senior unsecured debt and mortgage notes payable, net	$	1,557,260	$	1,618,274	$	1,697,116	$	1,749,211

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Earnings Per Common Share (Tables)

9 Months Ended

Sep. 30, 2016

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share (amounts in thousands except per share amounts):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Numerator for earnings per common share - basic and diluted:
Net income	$	86,388		$	30,466		$	220,634		$	56,712
Preferred distributions	(1,997		)	(6,981		)	(15,959		)	(20,943		)
Excess fair value of consideration paid over carrying value of preferred shares	—			—			(9,609		)	—
Numerator for net income per share	$	84,391		$	23,485		$	195,066		$	35,769
Denominator for earnings per common share - basic and diluted:
Weighted average number of common shares outstanding - basic	125,533			128,739			125,627			129,386
Weighted average number of common shares outstanding - diluted(1)	126,568			129,878			127,009			130,093
Net income per common share attributable to Equity Commonwealth common shareholders:
Basic	$	0.67		$	0.18		$	1.55		$	0.28
Diluted	$	0.67		$	0.18		$	1.54		$	0.27
Anti-dilutive securities:
Effect of Series D preferred shares; 6 1/2% cumulative convertible(2)	2,363			2,363			2,363			2,363

(1) As of September 30, 2016, we had granted RSUs to certain employees, officers, and the chairman of the Board of Trustees.  The RSUs contain both service and market-based vesting components.  None of the RSUs have vested. If the market-based vesting component was measured as of September 30, 2016, and 2015, 1,035 and 1,139 common shares would be issued to the RSU holders, respectively. Using a weighted average basis, 1,035 and 1,139 common shares are reflected in diluted earnings per share for the three months ended September 30, 2016 and 2015, respectively and 1,382 and 707 common shares are reflected in diluted earnings per share for the nine months ended September 30, 2016 and 2015, respectively.

(2) The Series D preferred shares are excluded from the diluted earnings per share calculation because including the Series D preferred shares would also require that the preferred distributions be added back to net income, resulting in anti-dilution during the periods presented.

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Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets, net	$ 123,699	$ 144,341
Senior unsecured notes, net	925,000
Mortgage notes payable, net	$ 243,993	246,510
ASU 2015-03
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets, net		144,341
Senior unsecured notes, net		1,450,606
Mortgage notes payable, net		246,510
ASU 2015-03 | Originally Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets, net		157,549
Senior unsecured notes, net		1,460,592
Mortgage notes payable, net		249,732
ASU 2015-03 | Effect of Change
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets, net		(13,208)
Senior unsecured notes, net		(9,986)
Mortgage notes payable, net		$ (3,222)

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Real Estate Properties - Narrative (Details) $ in Thousands	1 Months Ended	9 Months Ended		12 Months Ended
	Jan. 31, 2013 building	Sep. 30, 2016 USD ($) ft² building	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) ft² land_parcel building property
Real Estate Properties [Line Items]
Real estate improvements | $		$ 88,500	$ 46,700
Number of properties held for sale | property				0
Number of buildings sold | building	18
Disposed of by Sale
Real Estate Properties [Line Items]
Number of properties sold | property				91
Number of buildings sold | building		56		135
Number of land parcels | land_parcel				1
Square Footage (in sqft) | ft²		7,222,691		18,900,000
Gross sales price | $		$ 1,142,365		$ 2,000,000

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Real Estate Properties - Summary of Properties Held for Sale (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) ft² building property	Dec. 31, 2015 property
Real Estate Properties [Line Items]
Number of Properties		0
Held-for-sale | 7800 Shoal Creek Boulevard
Real Estate Properties [Line Items]
Number of Properties	1
Number of Buildings | building	4
Square Footage (in sqft) | ft²	151,917
Gross Sales Price | $	$ 29,210

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Real Estate Properties - Summary of Balance Sheet Information for all Properties Classified as Held for sale (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Liabilities related to properties held for sale	$ 667	$ 0
Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate properties	12,952
Other assets, net	511
Properties held for sale	13,463
Accounts payable and accrued expenses	337
Rent collected in advance	19
Security deposits	311
Liabilities related to properties held for sale	$ 667

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Real Estate Properties - Summary of Properties Sold (Details) $ in Thousands	1 Months Ended								3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2016 USD ($) ft² building property	Jul. 31, 2016 USD ($) ft² building property	Jun. 30, 2016 USD ($) ft² building property	May 31, 2016 USD ($) ft² building property	Apr. 30, 2016 USD ($) ft² building property	Mar. 31, 2016 USD ($) ft² building property	Feb. 29, 2016 USD ($) ft² building property	Jan. 31, 2013 building property	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) ft² building property	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) ft² building
Real Estate Properties [Line Items]
Number of Properties | property								3
Number of Buildings | building								18
Gain (Loss) on Sale									$ 82,169	$ 39,793	$ 225,210	$ 42,953
Disposed of by Sale
Real Estate Properties [Line Items]
Number of Properties | property											27
Number of Buildings | building											56		135
Square Footage (in sqft) | ft²											7,222,691		18,900,000
Gross Sales Price											$ 1,142,365		$ 2,000,000
Gain (Loss) on Sale											$ 225,095
Disposed of by Sale | Executive Park
Real Estate Properties [Line Items]
Number of Properties | property							1
Number of Buildings | building							9
Square Footage (in sqft) | ft²							427,443
Gross Sales Price							$ 50,865
Gain (Loss) on Sale							$ 16,531
Disposed of by Sale | 3330 N Washington Boulevard
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings | building						1
Square Footage (in sqft) | ft²						55,719
Gross Sales Price						$ 11,250
Gain (Loss) on Sale						$ 5,455
Disposed of by Sale | 111 East Kilbourn Avenue
Real Estate Properties [Line Items]
Number of Properties | property						1
Number of Buildings | building						1
Square Footage (in sqft) | ft²						373,669
Gross Sales Price						$ 60,500
Gain (Loss) on Sale						$ 14,677
Disposed of by Sale | 1525 Locust Street
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings | building					1
Square Footage (in sqft) | ft²					98,009
Gross Sales Price					$ 17,700
Gain (Loss) on Sale					$ 8,956
Disposed of by Sale | 633 Ahua Street
Real Estate Properties [Line Items]
Number of Properties | property					1
Number of Buildings | building					1
Square Footage (in sqft) | ft²					93,141
Gross Sales Price					$ 29,000
Gain (Loss) on Sale					$ 15,963
Disposed of by Sale | Lakewood on the Park
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings | building				2
Square Footage (in sqft) | ft²				180,558
Gross Sales Price				$ 37,100
Gain (Loss) on Sale				$ 13,616
Disposed of by Sale | Leased Land
Real Estate Properties [Line Items]
Number of Properties | property			1
Number of Buildings | building			7
Square Footage (in sqft) | ft²			0
Gross Sales Price			$ 48,450
Gain (Loss) on Sale			$ 15,914
Disposed of by Sale | 9110 East Nichols Avenue
Real Estate Properties [Line Items]
Number of Properties | property			1
Number of Buildings | building			1
Square Footage (in sqft) | ft²			143,958
Gross Sales Price			$ 17,200
Gain (Loss) on Sale			$ 642
Disposed of by Sale | 111 River Street(1)
Real Estate Properties [Line Items]
Number of Properties | property		1
Number of Buildings | building		1
Square Footage (in sqft) | ft²		566,215
Gross Sales Price		$ 235,000
Gain (Loss) on Sale		$ 78,240
Disposed of by Sale | Sky Park Centre
Real Estate Properties [Line Items]
Number of Properties | property		1
Number of Buildings | building		2
Square Footage (in sqft) | ft²		63,485
Gross Sales Price		$ 13,700
Gain (Loss) on Sale		$ 4,745
Disposed of by Sale | Raintree Industrial Park
Real Estate Properties [Line Items]
Number of Properties | property		1
Number of Buildings | building		12
Square Footage (in sqft) | ft²		563,182
Gross Sales Price		$ 11,500
Gain (Loss) on Sale		$ (653)
Disposed of by Sale | 8701 N Mopac
Real Estate Properties [Line Items]
Number of Properties | property	1
Number of Buildings | building	1
Square Footage (in sqft) | ft²	121,901
Gross Sales Price	$ 21,500
Gain (Loss) on Sale	$ 8,394
Disposed of by Sale | 812 San Antonio Street
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings | building				1
Square Footage (in sqft) | ft²				59,321
Disposed of by Sale | 1601 Rio Grande Street
Real Estate Properties [Line Items]
Number of Properties | property				1
Number of Buildings | building				1
Square Footage (in sqft) | ft²				56,219
Disposed of by Sale | Downtown Austin portfolio
Real Estate Properties [Line Items]
Number of Properties | property				2
Number of Buildings | building				2
Square Footage (in sqft) | ft²				115,540
Gross Sales Price				$ 32,600
Gain (Loss) on Sale				$ 20,584
Disposed of by Sale | 785 Schilinger Road South
Real Estate Properties [Line Items]
Number of Properties | property			1
Number of Buildings | building			1
Square Footage (in sqft) | ft²			72,000
Disposed of by Sale | 401 Vine Street
Real Estate Properties [Line Items]
Number of Properties | property			1
Number of Buildings | building			1
Square Footage (in sqft) | ft²			53,980
Disposed of by Sale | 633 Frazier Drive
Real Estate Properties [Line Items]
Number of Properties | property			1
Number of Buildings | building			1
Square Footage (in sqft) | ft²			150,000
Disposed of by Sale | 9840 Gateway Boulevard North
Real Estate Properties [Line Items]
Number of Properties | property			1
Number of Buildings | building			1
Square Footage (in sqft) | ft²			72,000
Disposed of by Sale | 3003 South Expressway 281
Real Estate Properties [Line Items]
Number of Properties | property			1
Number of Buildings | building			1
Square Footage (in sqft) | ft²			150,000
Disposed of by Sale | 1331 North Center Parkway
Real Estate Properties [Line Items]
Number of Properties | property			1
Number of Buildings | building			1
Square Footage (in sqft) | ft²			53,980
Disposed of by Sale | Movie theater portfolio
Real Estate Properties [Line Items]
Number of Properties | property			6
Number of Buildings | building			6
Square Footage (in sqft) | ft²			551,960
Gross Sales Price			$ 109,100
Gain (Loss) on Sale			$ 30,595
Disposed of by Sale | 128 Crews Drive
Real Estate Properties [Line Items]
Number of Properties | property		1
Number of Buildings | building		1
Square Footage (in sqft) | ft²		185,600
Disposed of by Sale | 111 Southchase Boulevard
Real Estate Properties [Line Items]
Number of Properties | property		1
Number of Buildings | building		1
Square Footage (in sqft) | ft²		168,087
Disposed of by Sale | 1043 Global Avenue
Real Estate Properties [Line Items]
Number of Properties | property		1
Number of Buildings | building		1
Square Footage (in sqft) | ft²		450,000
Disposed of by Sale | South Carolina industrial portfolio
Real Estate Properties [Line Items]
Number of Properties | property		3
Number of Buildings | building		3
Square Footage (in sqft) | ft²		803,687
Gross Sales Price		$ 30,000
Gain (Loss) on Sale		$ 7,244
Disposed of by Sale | 100 East Wisconsin Avenue
Real Estate Properties [Line Items]
Number of Properties | property	1
Number of Buildings | building	1
Square Footage (in sqft) | ft²	435,067
Disposed of by Sale | 111 Monument Circle
Real Estate Properties [Line Items]
Number of Properties | property	1
Number of Buildings | building	2
Square Footage (in sqft) | ft²	1,121,764
Disposed of by Sale | 101-115 W. Washington Street
Real Estate Properties [Line Items]
Number of Properties | property	1
Number of Buildings | building	1
Square Footage (in sqft) | ft²	634,058
Disposed of by Sale | North Point Office Complex
Real Estate Properties [Line Items]
Number of Properties | property	1
Number of Buildings | building	2
Square Footage (in sqft) | ft²	873,335
Disposed of by Sale | Midwest portfolio
Real Estate Properties [Line Items]
Number of Properties | property	4
Number of Buildings | building	6
Square Footage (in sqft) | ft²	3,064,224
Gross Sales Price	$ 416,900
Gain (Loss) on Sale	$ (15,808)

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Real Estate Mortgages Receivable - Narrative (Details)	1 Months Ended
	Jan. 31, 2013 USD ($) building property	Apr. 30, 2012 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Mortgage Loans on Real Estate [Abstract]
Total real estate mortgage receivable included in other assets, carrying value			$ 8,100,000	$ 8,100,000
Mortgage financing related to sale of suburban property	$ 7,700,000	$ 400,000
Interest rate on real estate mortgage receivable, percent	6.00%	6.00%
Number of properties sold or agreed to be sold | property	3
Number of buildings sold | building	18
Allowance for mortgage receivables			$ 0	$ 0

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Indebtedness - Narrative (Details)			3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) building property	Feb. 16, 2016 USD ($)	Sep. 30, 2016 USD ($) building property	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) option building property	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Senior unsecured notes, net	$ 925,000,000		$ 925,000,000		$ 925,000,000
Loss on early extinguishment of debt			0	$ (3,887,000)	(118,000)	$ 6,111,000
Real estate properties, net	2,183,931,000		2,183,931,000		2,183,931,000		$ 2,988,413,000
Mortgage notes payable, net	243,993,000		243,993,000		$ 243,993,000		$ 246,510,000
Revolving credit facility
Debt Instrument [Line Items]
Interest rate payable percentage					1.78%
Amount outstanding	0		0		$ 0
Revolving credit facility | Minimum
Debt Instrument [Line Items]
Commitment fee percentage					0.125%
Revolving credit facility | Maximum
Debt Instrument [Line Items]
Commitment fee percentage					0.30%
Revolving credit facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate					1.25%
Revolving credit facility | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate					0.875%
Revolving credit facility | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate					1.55%
Revolving credit facility | Base rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate					0.00%
Revolving credit facility | Base rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate					0.55%
Unsecured revolving credit facility | Revolving credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity	750,000,000.0		750,000,000.0		$ 750,000,000.0
Debt instrument, number of extension options | option					2
Debt instrument, extension option term					6 months
Debt instrument, extension option fee, percent					0.075%
Amount available for borrowing	$ 750,000,000.0		750,000,000.0		$ 750,000,000.0
Commitment fee percentage	0.25%
Unsecured revolving credit facility | Letter of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 100,000,000.0		100,000,000.0		100,000,000.0
Loan facility, 5-year term
Debt Instrument [Line Items]
Term loan amount outstanding	200,000,000.0		200,000,000.0		$ 200,000,000.0
Interest accrual rate					1.93%
Loan facility, 5-year term | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate					1.40%
Loan facility, 5-year term | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate					0.90%
Loan facility, 5-year term | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate					1.80%
Loan facility, 5-year term | Revolving credit facility
Debt Instrument [Line Items]
Debt instrument, term					5 years
Loan facility, 7-year term
Debt Instrument [Line Items]
Term loan amount outstanding	200,000,000		200,000,000		$ 200,000,000
Interest accrual rate					2.33%
Loan facility, 7-year term | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate					1.80%
Loan facility, 7-year term | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate					1.40%
Loan facility, 7-year term | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate					2.35%
Loan facility, 7-year term | Revolving credit facility
Debt Instrument [Line Items]
Debt instrument, term					7 years
Senior Notes 6.25% Due 2016
Debt Instrument [Line Items]
Amount of debt, redeemed, defeased, or prepaid		$ 139,100,000
Interest rate stated percentage		6.25%
Loss on early extinguishment of debt					$ (100,000)
Revolving credit facility and term loans
Debt Instrument [Line Items]
Additional increases in maximum amount of borrowings available	$ 1,150,000,000.00		$ 1,150,000,000.00		$ 1,150,000,000.00
Mortgage notes
Debt Instrument [Line Items]
Number of real estate properties secured by mortgage | property	5		5		5
Number of buildings secured by mortgage | building	8		8		8
Real estate properties, net	$ 293,300,000		$ 293,300,000		$ 293,300,000
Mortgage notes payable, net	$ 244,000,000		$ 244,000,000		$ 244,000,000

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Shareholders' Equity - Narrative (Details)		2 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	May 15, 2016 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) authorization	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) $ / shares shares	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) $ / shares shares	Mar. 17, 2016 USD ($)	Sep. 14, 2015 USD ($)	Aug. 24, 2015 USD ($)
Class of Stock [Line Items]
Number of expired stock repurchase programs | authorization		2
Stock repurchase program, amount not utilized		$ 86,600,000	$ 86,600,000		$ 86,600,000		$ 86,600,000
Excess fair value of consideration paid over carrying value of preferred shares			0	$ 0	$ 9,609,000	$ 0
Common Shares
Class of Stock [Line Items]
Stock repurchase program, authorized amount (up to)										$ 100,000,000.0
Stock repurchase program, additional authorized amount (up to)								$ 150,000,000	$ 100,000,000.0
Number of shares repurchased (in shares) | shares					983,789		4,394,089
Treasury stock acquired, average cost per share (in USD per share) | $ / shares					$ 25.94		$ 25.80
Stock repurchased and retired during period, value					$ 25,500,000		$ 113,400,000
Remaining authorized repurchase amount		$ 150,000,000	$ 150,000,000		$ 150,000,000		$ 150,000,000
Series E
Class of Stock [Line Items]
Stock repurchased during period, shares | shares	11,000,000
Redemption price per share (in USD per share) | $ / shares	$ 25.00
Preferred stock, redemption amount	$ 275,000,000

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Shareholders' Equity - Schedule of Declared Distributions (Details) - $ / shares	Nov. 15, 2016	Oct. 10, 2016	Aug. 15, 2016	Jul. 11, 2016	May 16, 2016	Apr. 15, 2016	Feb. 16, 2016	Jan. 26, 2016
Series D
Class of Stock [Line Items]
Dividend declared (in USD per share)				$ 0.40625		$ 0.40625		$ 0.40625
Dividend paid (in USD per share)			$ 0.40625		$ 0.40625		$ 0.40625
Series E
Class of Stock [Line Items]
Dividend declared (in USD per share)				$ 0		$ 0.453125		$ 0.453125
Dividend paid (in USD per share)			$ 0		$ 0.453125		$ 0.453125
Subsequent event | Series D
Class of Stock [Line Items]
Dividend declared (in USD per share)		$ 0.40625
Dividend paid (in USD per share)	$ 0.40625
Subsequent event | Series E
Class of Stock [Line Items]
Dividend declared (in USD per share)		$ 0
Dividend paid (in USD per share)	$ 0

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Cumulative Other Comprehensive Loss - Schedule of Amounts Recognized in Cumulative Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016
Amounts recognized in cumulative other comprehensive income (Loss) by component
Balance as of Beginning of Period		$ (3,687)
Balance as of End of Period	$ (1,117)	(1,117)
Unrealized Loss on Derivative Instruments
Amounts recognized in cumulative other comprehensive income (Loss) by component
Balance as of Beginning of Period	(2,234)	(3,687)
Other comprehensive income (loss) before reclassifications	23	(748)
Amounts reclassified from cumulative other comprehensive loss to net income	1,094	3,318
Net current period other comprehensive income	1,117	2,570
Balance as of End of Period	$ (1,117)	$ (1,117)

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Cumulative Other Comprehensive Loss - Schedule of Reclassifications Out of Cumulative Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassifications out of cumulative other comprehensive income (Loss)
Interest expense	$ 21,427	$ 25,111	$ 65,074	$ 82,926
Amounts Reclassified from Cumulative Other Comprehensive Loss to Net Income | Interest rate swap contracts
Reclassifications out of cumulative other comprehensive income (Loss)
Interest expense	$ 1,094		$ 3,318

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Income Taxes - Schedule of Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Current:
State	$ 225	$ 90	$ 465	$ 270
Federal	0	0	0	525
Foreign	0	(67)	0	2,337
Current income tax expense (benefit)	225	23	465	3,132
Deferred:
Foreign	0	0	0	(755)
Deferred income tax expense (benefit)	0	0	0	(755)
Income tax expense	$ 225	$ 23	$ 465	$ 2,377

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Derivative Instruments - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Mar. 04, 2016
Derivative [Line Items]
Aggregate termination value	$ 1,100
Interest rate swap
Derivative [Line Items]
Fair value of derivatives in a net liability position	1,100
Interest rate cap | LIBOR
Derivative [Line Items]
Derivative, cap interest rate, percent		2.50%
Cash flow hedging | Designated as hedging instrument
Derivative [Line Items]
Estimated gain (loss) reclassification from OCI to income	(700)
Cash flow hedging | Designated as hedging instrument | Interest rate swap
Derivative [Line Items]
Amount of hedged item	$ 168,100
Derivative, variable interest rate	LIBOR
Notional amount	$ 168,103
Cash flow hedging | Designated as hedging instrument | Interest rate cap
Derivative [Line Items]
Notional amount	$ 400,000

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Derivative Instruments - Schedule of Outstanding Interest Rate Derivatives Designated as Cash Flow Hedges of Interest Rate Risk (Details) - Cash flow hedging - Designated as hedging instrument $ in Thousands	Sep. 30, 2016 USD ($) financial_instrument
Interest rate swap
Derivative [Line Items]
Number of Instruments | financial_instrument	2
Notional Amount (in thousands) | $	$ 168,103
Interest rate cap
Derivative [Line Items]
Number of Instruments | financial_instrument	1
Notional Amount (in thousands) | $	$ 400,000

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Derivative Instruments - Schedule of Fair Value of Derivative Financial Instruments (Details) - Cash flow hedging - Designated as hedging instrument - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Interest rate swap | Accounts payable and accrued expenses
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Designated as Hedging Instrument	$ (707)	$ (3,687)
Interest rate cap | Other Assets
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Designated as Hedging Instrument	$ 112	$ 0

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Derivative Instruments - Schedule of Gain or Loss Recognized on Interest Rate Derivatives Designated as Cash Flow Hedges (Details) - Cash flow hedging - Designated as hedging instrument - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in cumulative other comprehensive loss	$ 23	$ (418)	$ (748)	$ (1,378)
Amount of loss reclassified from cumulative other comprehensive loss into interest expense	$ 1,094	$ 1,239	$ 3,318	$ 3,698

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Share-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions					3 Months Ended		9 Months Ended
	Jun. 16, 2016 USD ($) trustee $ / shares shares	Jan. 26, 2016 $ / shares shares	Jun. 16, 2015 USD ($) trustee $ / shares shares	Jan. 28, 2015 $ / shares shares	Sep. 30, 2016 USD ($) shares	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) tranche $ / shares shares	Sep. 30, 2015 USD ($) $ / shares shares
Share award plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares available for issuance (in shares)					2,358,464		2,358,464
Share award plan | General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense | $					$ 4.9	$ 3.7	$ 13.9	$ 11.8
Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity awards granted (in shares)		136,623		126,319
Vesting period					4 years
Granted shares value (in dollars per share) | $ / shares		$ 26.93		$ 26.58
Shares forfeited in period							539	8,115
Weighted average grant date fair value (in USD per share) | $ / shares							$ 26.82	$ 26.64
Estimated future compensation expense for unvested shares | $					$ 14.1		$ 14.1
Weighted average period over which compensation expense will be recorded							2 years 3 months 18 days
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity awards granted (in shares)		277,386		256,467
Granted shares value (in dollars per share) | $ / shares							$ 38.80
Number of tranches | tranche							2
Shares forfeited in period							1,094	16,475
Weighted average grant date fair value (in USD per share) | $ / shares							$ 38.72	$ 20.50
Estimated future compensation expense for unvested shares | $					$ 22.2		$ 22.2
Weighted average period over which compensation expense will be recorded							2 years 2 months 12 days
Restricted stock units | Vesting in three years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent							50.00%
Restricted stock units | Vesting in four years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent							50.00%
Independent Trustee | Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of trustees to whom common shares granted | trustee	9		9
Stock issued during period, value, share-based compensation, gross | $	$ 0.1		$ 0.1
Grants in period per employee (in shares)	3,463		3,843
Number of equity awards granted (in shares)	31,167		34,587
Vesting period	1 year		1 year
Granted shares value (in dollars per share) | $ / shares	$ 28.88		$ 26.02

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Share-Based Compensation - Summary of Assumptions and Fair Values for Restricted Stock Units Granted in the Period (Details) - Restricted stock units	9 Months Ended
	Sep. 30, 2016 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair value of RSUs granted (in dollars per share)	$ 38.80
Expected term (years)	4 years
Expected volatility	0.00%
Expected dividend yield	1.86%
Risk-free rate	1.07%

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Fair Value of Assets and Liabilities - Schedule of Assets and Liabilities Measure at Fair Value (Details) - Recurring $ in Thousands	Sep. 30, 2016 USD ($)
Interest rate swap
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	$ (707)
Interest rate swap | Level 1
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	0
Interest rate swap | Level 2
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	(707)
Interest rate swap | Level 3
Recurring Fair Value Measurements:
Effective portion of interest rate swap contracts	0
Interest rate cap
Recurring Fair Value Measurements:
Effective portion of interest rate cap contract	112
Interest rate cap | Level 1
Recurring Fair Value Measurements:
Effective portion of interest rate cap contract	0
Interest rate cap | Level 2
Recurring Fair Value Measurements:
Effective portion of interest rate cap contract	112
Interest rate cap | Level 3
Recurring Fair Value Measurements:
Effective portion of interest rate cap contract	$ 0

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Fair Value of Assets and Liabilities - Narrative (Details)	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2016 USD ($)	Aug. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Tenant	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Jul. 31, 2014 USD ($) $ / shares
Fair value of assets and liabilities
Loss on asset impairment			$ 0	$ 0	$ 43,736,000	$ 17,162,000
Number of tenants responsible for more than 4% of total annualized rents | Tenant					0
Real estate properties, net			2,183,931,000		$ 2,183,931,000			$ 2,988,413,000
Total rents | Credit concentration
Fair value of assets and liabilities
Concentration risk, percent					5.50%
General and Administrative Expense
Fair value of assets and liabilities
Change in fair value of derivatives			(100,000)		$ 1,000,000
Market Approach Valuation Technique | Real Estate Held-for-sale | Level 2
Fair value of assets and liabilities
Assets, fair value disclosure			264,900,000		264,900,000
Disposition Plan | Carrying Amount | Fair Value, Measurements, Nonrecurring
Fair value of assets and liabilities
Real estate properties, net			308,600,000		308,600,000
Derivative liability | Level 3
Fair value of assets and liabilities
Derivative liability			0		0			$ 7,200,000
Minimum
Fair value of assets and liabilities
Average closing price per common share during one year period after date (in dollars per share) | $ / shares									$ 26.00
Related/Corvex
Fair value of assets and liabilities
Amount of reimbursements payable to related party upon the approval of shareholders	$ 8,200,000	$ 8,400,000					$ 16,700,000
Amount of reimbursements payable to related party if specified minimum common share price maintain during the one year period after the date on which the reimbursement is approved by shareholders (up to)									$ 8,400,000
Amount of reimbursements payable to related party if specified minimum common share price maintain during the one year period between the first and second anniversaries of the date on which the reimbursement is approved by shareholders (up to)									$ 8,400,000
Derivative liability, potential reimbursement to related party contingent on stock price			$ 8,400,000		$ 8,400,000
Related/Corvex | Minimum
Fair value of assets and liabilities
Average closing price per common share during one year period after date (in dollars per share) | $ / shares									$ 26.00
Average closing price per common share during first and second year after date (in dollars per share) | $ / shares									$ 26.00

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Fair Value of Assets and Liabilities - Schedule of Fair Value and Carrying Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Carrying Amount
Fair value of financial instruments
Senior unsecured debt and mortgage notes payable, net	$ 1,557,260	$ 1,697,116
Fair Value
Fair value of financial instruments
Senior unsecured debt and mortgage notes payable, net	$ 1,618,274	$ 1,749,211

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Earnings Per Common Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Numerator for earnings per common share - basic and diluted:
Net income	$ 86,388	$ 30,466	$ 220,634	$ 56,712
Preferred distributions	(1,997)	(6,981)	(15,959)	(20,943)
Excess fair value of consideration paid over carrying value of preferred shares	0	0	(9,609)	0
Net income attributable to Equity Commonwealth common shareholders	$ 84,391	$ 23,485	$ 195,066	$ 35,769
Denominator for earnings per common share - basic and diluted:
Weighted average number of common shares outstanding — basic (in shares)	125,533	128,739	125,627	129,386
Weighted average number of common shares outstanding — diluted (in shares)	126,568	129,878	127,009	130,093
Net income per common share attributable to Equity Commonwealth common shareholders:
Basic (in USD per share)	$ 0.67	$ 0.18	$ 1.55	$ 0.28
Diluted (in USD per share)	$ 0.67	$ 0.18	$ 1.54	$ 0.27
Effect of Series D preferred shares; 6 1/2% cumulative convertible
Anti-dilutive securities:
Effect of Series D preferred shares; 6 1/2% cumulative convertible (in shares)	2,363	2,363	2,363	2,363
Effect of Series D preferred shares; 6 1/2% cumulative convertible
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Preferred shares, dividend yield	6.50%	6.50%	6.50%	6.50%	6.50%

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Earnings Per Common Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Footnote) (Details) - Restricted stock units - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
RSUs vested (in shares)			0
Common shares issued (in shares)	1,035,000	1,139,000	1,035,000	1,139,000
Weighted average common shares outstanding — diluted (in shares)	1,035,000	1,139,000	1,382,000	707,000

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Segment Information - Narrative (Details) - segment	3 Months Ended	9 Months Ended
	Dec. 31, 2015	Sep. 30, 2016
Segment Reporting [Abstract]
Number of reportable segments	2	1
Percentage of revenue from office properties (more than)		95.00%

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Related Person Transactions - Narrative (Details) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended		5 Months Ended	9 Months Ended		12 Months Ended
	Mar. 01, 2015 USD ($)	Aug. 31, 2016 USD ($)	Aug. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Feb. 28, 2015 USD ($)	Sep. 30, 2016 USD ($) option	Sep. 30, 2015 USD ($)	Dec. 31, 2015 parking_space	Dec. 31, 2014 USD ($)	Jul. 31, 2014 USD ($) $ / shares
Minimum
Related Party Transaction [Line Items]
Average closing price per common share during one year period after date (at least) (in dollars per share) | $ / shares											$ 26.00
Two North Riverside Plaza Joint Venture Limited Partnership
Related Party Transaction [Line Items]
Lease term							5 years
Number of renewal options of lease arrangement | option							1
Renewal term of lease arrangement							5 years
Tenant Improvements				$ 700			$ 700
Lease termination period duration							30 days
Expenses from transactions with related party				$ 200			$ 600
Equity Group Investments and associated entities
Related Party Transaction [Line Items]
Expenses from transactions with related party					$ 46			$ 100
Number of parking spaces | parking_space									1
Equity Residential Management, L.L.C.
Related Party Transaction [Line Items]
Expenses from transactions with related party					$ 100			$ 300
Related/Corvex
Related Party Transaction [Line Items]
Due to related persons											$ 33,500
Amount of reimbursements payable to related party upon the approval of shareholders		$ 8,200	$ 8,400							$ 16,700
Amount of reimbursements payable to related party if specified minimum common share price maintain during the one year period after the date on which the reimbursement is approved by shareholders (up to)											8,400
Amount of reimbursements payable to related party if specified minimum common share price maintain during the one year period between the first and second anniversaries of the date on which the reimbursement is approved by shareholders (up to)											$ 8,400
Related/Corvex | Minimum
Related Party Transaction [Line Items]
Average closing price per common share during one year period after date (at least) (in dollars per share) | $ / shares											$ 26.00
Average closing price per common share during first and second year after date (in dollars per share) | $ / shares											$ 26.00
RMR and RMR Australia
Related Party Transaction [Line Items]
Monthly management transition fee	$ 100					$ 1,200

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Subsequent Events - Narrative (Details) $ in Thousands		1 Months Ended		9 Months Ended	12 Months Ended
	Nov. 01, 2016 USD ($)	Oct. 31, 2016 USD ($) ft² building property	Jan. 31, 2013 building	Sep. 30, 2016 USD ($) ft² building	Dec. 31, 2015 USD ($) ft² building property
Subsequent Event [Line Items]
Number of buildings sold | building			18
Disposed of by Sale
Subsequent Event [Line Items]
Number of properties sold | property					91
Number of buildings sold | building				56	135
Property square feet | ft²				7,222,691	18,900,000
Gross sales price				$ 1,142,365	$ 2,000,000
Subsequent event | Senior notes 6.25% due 2017
Subsequent Event [Line Items]
Amount of debt intended to be redeemed	$ 250,000
Interest rate stated percentage	6.25%
Percentage of principal amount redeemed	100.00%
Subsequent event | Austin, Texas
Subsequent Event [Line Items]
Payments to acquire land		$ 2,800
Subsequent event | Disposed of by Sale
Subsequent Event [Line Items]
Number of properties sold | property		1
Number of buildings sold | building		4
Property square feet | ft²		151,917
Gross sales price		$ 29,200