Rexford Industrial Realty (REXR) 10-Q 1 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 29, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	REXR
Entity Registrant Name	Rexford Industrial Realty, Inc.
Entity Central Index Key	1,571,283
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding (in shares)		92,791,920

CONSOLIDATED BALANCE SHEETS (Un

CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
ASSETS
Land	$ 1,218,386	$ 997,588
Buildings and improvements	1,253,935	1,079,746
Tenant improvements	54,808	49,692
Furniture, fixtures and equipment	151	167
Construction in progress	50,367	34,772
Total real estate held for investment	2,577,647	2,161,965
Accumulated depreciation	(214,680)	(173,541)
Investments in real estate, net	2,362,967	1,988,424
Cash and cash equivalents	183,904	6,620
Restricted cash	0	250
Rents and other receivables, net	5,042	3,664
Deferred rent receivable, net	20,770	15,826
Deferred leasing costs, net	13,446	12,014
Deferred loan costs, net	1,467	1,930
Acquired lease intangible assets, net	53,402	49,239
Acquired indefinite-lived intangible	5,156	5,156
Interest rate swap asset	13,851	7,193
Other assets	7,508	6,146
Acquisition related deposits	1,325	2,475
Assets associated with real estate held for sale	0	12,436
Total Assets	2,668,838	2,111,373
Liabilities
Notes payable	757,218	668,941
Interest rate swap liability	0	219
Accounts payable, accrued expenses and other liabilities	30,411	21,134
Dividends payable	15,214	11,727
Acquired lease intangible liabilities, net	52,289	18,067
Tenant security deposits	21,888	19,521
Prepaid rents	6,424	6,267
Liabilities associated with real estate held for sale	0	243
Total Liabilities	883,444	746,119
Rexford Industrial Realty, Inc. stockholders’ equity
Common Stock, $0.01 par value per share, 490,000,000 authorized and 92,706,880 and 78,495,882 shares outstanding at September 30, 2018 and December 31, 2017, respectively	924	782
Additional paid in capital	1,666,339	1,239,810
Cumulative distributions in excess of earnings	(85,358)	(67,058)
Accumulated other comprehensive income	13,558	6,799
Total stockholders’ equity	1,754,557	1,340,046
Noncontrolling interests	30,837	25,208
Total Equity	1,785,394	1,365,254
Total Liabilities and Equity	2,668,838	2,111,373
5.875% series A cumulative redeemable preferred stock, 3,600,000 shares outstanding at September 30, 2018 and December 31, 2017 ($90,000 liquidation preference)
Rexford Industrial Realty, Inc. stockholders’ equity
Preferred stock, $0.01 par value per share, 10,000,000 shares authorized,	86,651	86,651
5.875% series B cumulative redeemable preferred stock, 3,000,000 shares outstanding at September 30, 2018 and December 31, 2017 ($75,000 liquidation preference)
Rexford Industrial Realty, Inc. stockholders’ equity
Preferred stock, $0.01 par value per share, 10,000,000 shares authorized,	$ 72,443	$ 73,062

CONSOLIDATED BALANCE SHEETS (_2

CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000	10,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	490,000,000	490,000,000	490,000,000
Common stock, shares outstanding (in shares)	92,706,880	92,706,880	78,495,882
Series A Preferred Stock
Preferred Stock, Dividend Rate, Percentage	5.875%	5.875%	5.875%
Preferred stock, shares outstanding (in shares)	3,600,000	3,600,000	3,600,000
Preferred Stock, Liquidation Preference, Value	$ 90,000,000	$ 90,000,000	$ 90,000,000
Series B Preferred Stock
Preferred Stock, Dividend Rate, Percentage	5.875%	5.875%	5.875%
Preferred stock, shares outstanding (in shares)	3,000,000	3,000,000	3,000,000
Preferred Stock, Liquidation Preference, Value	$ 75,000,000	$ 75,000,000	$ 75,000,000

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
RENTAL REVENUES
Rental income	$ 45,661	$ 36,748	$ 130,139	$ 97,494
Tenant reimbursements	8,508	6,279	23,733	16,606
Other income	300	203	646	550
TOTAL RENTAL REVENUES	54,469	43,230	154,518	114,650
Management, leasing and development services	116	109	359	380
Interest income	609	0	609	445
TOTAL REVENUES	55,194	43,339	155,486	115,475
OPERATING EXPENSES
Property expenses	13,294	11,229	38,029	29,987
General and administrative	6,229	5,843	18,897	16,052
Depreciation and amortization	20,144	17,971	59,371	46,085
TOTAL OPERATING EXPENSES	39,667	35,043	116,297	92,124
OTHER EXPENSES
Acquisition expenses	106	16	152	421
Interest expense	6,456	6,271	18,760	14,571
TOTAL OTHER EXPENSES	6,562	6,287	18,912	14,992
TOTAL EXPENSES	46,229	41,330	135,209	107,116
Equity in income from unconsolidated real estate entities	0	0	0	11
Loss on extinguishment of debt	0	0	0	(22)
Gains on sale of real estate	0	0	11,591	19,237
NET INCOME	8,965	2,009	31,868	27,585
Less: net income attributable to noncontrolling interest	(141)	(21)	(588)	(684)
NET INCOME ATTRIBUTABLE TO REXFORD INDUSTRIAL REALTY, INC.	8,824	1,988	31,280	26,901
Less: preferred stock dividends	(2,423)	(1,322)	(7,270)	(3,966)
Less: earnings allocated to participating securities	(94)	(80)	(285)	(327)
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ 6,307	$ 586	$ 23,725	$ 22,608
Net income attributable to common stockholders - basic (in dollars per share)	$ 0.07	$ 0.01	$ 0.28	$ 0.33
Net income attributable to common stockholders - diluted (in dollars per share)	$ 0.07	$ 0.01	$ 0.28	$ 0.33
Weighted average shares of common stock outstanding - basic (in shares)	91,463,594	72,621,219	84,407,429	68,984,047
Weighted average shares of common stock outstanding - diluted (in shares)	91,945,206	73,068,081	84,925,472	69,364,855
Dividends declared per common share (in dollars per share)	$ 0.160	$ 0.145	$ 0.480	$ 0.435

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 8,965	$ 2,009	$ 31,868	$ 27,585
Other comprehensive income (loss): cash flow hedge adjustment	815	662	6,877	418
Comprehensive income	9,780	2,671	38,745	28,003
Comprehensive income attributable to noncontrolling interests	(151)	(29)	(706)	(677)
Comprehensive income attributable to Rexford Industrial Realty, Inc.	$ 9,629	$ 2,642	$ 38,039	$ 27,326

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Total Stockholders’ Equity	Preferred Stock	Common Stock	Additional Paid-in Capital	Cumulative Distributions in Excess of Earnings	Accumulated Other Comprehensive Income	Noncontrolling Interests
Beginning Balance at Dec. 31, 2016	$ 962,140	$ 939,315	$ 86,651	$ 662	$ 907,834	$ (59,277)	$ 3,445	$ 22,825
Beginning Balance (in shares) at Dec. 31, 2016				66,454,375
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)				11,043,880
Issuance of common stock	309,104	309,104		$ 110	308,994
Offering costs	(5,236)	(5,236)	0		(5,236)
Share-based compensation (in shares)				67,132
Share-based compensation	4,190	1,712		$ 1	1,711			2,478
Shares acquired to satisfy employee tax withholding requirements on vesting restricted stock (in shares)				(31,403)
Shares acquired to satisfy employee tax withholding requirements on vesting restricted stock	(798)	(798)			(798)
Conversion of units to common stock (in shares)				61,256
Conversion of units to common stock		618			618			(618)
Net income	27,585	26,901	3,966			22,935		684
Other comprehensive income	418	425					425	(7)
Preferred stock dividends	(3,966)	(3,966)	(3,966)
Common stock dividends	(31,236)	(31,236)				(31,236)
Distributions	(998)							(998)
Ending Balance at Sep. 30, 2017	1,261,203	1,236,839	86,651	$ 773	1,213,123	(67,578)	3,870	24,364
Ending Balance (in shares) at Sep. 30, 2017				77,595,240
Beginning Balance at Dec. 31, 2017	$ 1,365,254	1,340,046	159,713	$ 782	1,239,810	(67,058)	6,799	25,208
Beginning Balance (in shares) at Dec. 31, 2017	78,495,882			78,495,882
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)				14,081,074
Issuance of common stock	$ 432,263	432,263		$ 141	432,122
Offering costs	(7,026)	(7,026)	(32)		(6,994)
Share-based compensation (in shares)				90,412
Share-based compensation	8,049	1,415		$ 1	1,414			6,634
Shares acquired to satisfy employee tax withholding requirements on vesting restricted stock (in shares)				(20,663)
Shares acquired to satisfy employee tax withholding requirements on vesting restricted stock	(573)	(573)			(573)
Conversion of units to common stock (in shares)				60,175
Conversion of units to common stock	600	560			560			(560)
Net income	31,868	31,280	7,270			24,010		588
Other comprehensive income	6,877	6,759					6,759	118
Preferred stock dividends	(7,857)	(7,857)	(7,857)
Common stock dividends	(42,310)	(42,310)				(42,310)
Distributions	(1,151)							(1,151)
Ending Balance at Sep. 30, 2018	$ 1,785,394	$ 1,754,557	$ 159,094	$ 924	$ 1,666,339	$ (85,358)	$ 13,558	$ 30,837
Ending Balance (in shares) at Sep. 30, 2018	92,706,880			92,706,880

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 31,868	$ 27,585
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in income from unconsolidated real estate entities	0	(11)
Provision for doubtful accounts	804	863
Depreciation and amortization	59,371	46,085
Amortization of (below) above market lease intangibles, net	(4,354)	(1,203)
Accretion of loan origination fees	0	(150)
Deferred interest income on notes receivable	0	84
Loss on extinguishment of debt	0	22
Gain on sale of real estate	(11,591)	(19,237)
Amortization of debt issuance costs	987	853
Amortization of discount (premium) on notes payable	4	(131)
Equity based compensation expense	7,866	4,070
Straight-line rent	(4,985)	(3,259)
Change in working capital components:
Rents and other receivables	(2,151)	(1,154)
Deferred leasing costs	(4,494)	(3,612)
Other assets	(1,880)	(2,301)
Accounts payable, accrued expenses and other liabilities	8,310	6,227
Tenant security deposits	1,844	2,054
Prepaid rents	(654)	1,344
Net cash provided by operating activities	80,945	58,129
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of investments in real estate	(363,542)	(532,108)
Capital expenditures	(41,278)	(29,182)
Acquisition related deposits	1,150	(1,075)
Distributions from unconsolidated real estate entities	0	11
Principal repayments of note receivable	0	6,000
Proceeds from sale of real estate	35,177	64,406
Net cash used in investing activities	(368,493)	(491,948)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of stock, net	425,237	303,868
Proceeds from notes payable	401,000	552,000
Repayment of notes payable	(311,503)	(387,497)
Debt issuance costs	(1,748)	(2,266)
Debt extinguishment costs	0	(193)
Dividends paid to preferred stockholders	(7,857)	(3,966)
Dividends paid to common stockholders	(38,859)	(28,955)
Distributions paid to common unitholders	(1,115)	(981)
Repurchase of common shares to satisfy employee tax withholding requirements	573	798
Net cash provided by financing activities	464,582	431,212
Increase (decrease) in cash, cash equivalents and restricted cash	177,034	(2,607)
Cash, cash equivalents and restricted cash, beginning of period	6,870	15,525
Cash, cash equivalents and restricted cash, end of period	183,904	12,918
Supplemental disclosure of cash flow information:
Cash paid for interest (net of capitalized interest of $1,585 and $1,311 for the nine months ended September 30, 2018 and 2017, respectively)	18,477	14,105
Supplemental disclosure of noncash investing and financing transactions:
(Decrease) increase in capital expenditure accrual	1,598	1,659
Accrual of dividends	$ 15,214	$ 11,580

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Cash Flows [Abstract]
Capitalized interest, net	$ 700	$ 400	$ 1,585	$ 1,311

Organization

Organization	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Rexford Industrial Realty, Inc. is a self-administered and self-managed full-service real estate investment trust (“REIT”) focused on owning and operating industrial properties in Southern California infill markets. We were formed as a Maryland corporation on January 18, 2013, and Rexford Industrial Realty, L.P. (the “Operating Partnership”), of which we are the sole general partner, was formed as a Maryland limited partnership on January 18, 2013. Through our controlling interest in our Operating Partnership and its subsidiaries, we own, manage, lease, acquire and develop industrial real estate principally located in Southern California infill markets, and, from time to time, acquire or provide mortgage debt secured by industrial property. As of September 30, 2018 , our consolidated portfolio consisted of 167 properties with approximately 20.5 million rentable square feet. In addition, we currently manage 20 properties with approximately 1.2 million rentable square feet. The terms “us,” “we,” “our,” and the “Company” as used in these financial statements refer to Rexford Industrial Realty, Inc. and its subsidiaries (including our Operating Partnership).

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation and Principles of Consolidation As of September 30, 2018 , and December 31, 2017 , and for the three and nine months ended September 30, 2018 and 2017 , the financial statements presented are the consolidated financial statements of Rexford Industrial Realty, Inc. and its subsidiaries, including our Operating Partnership. All significant intercompany balances and transactions have been eliminated in the consolidated financial statements. Under consolidation guidance, we have determined that our Operating Partnership is a variable interest entity because the holders of limited partnership interests do not have substantive kick-out rights or participating rights. Furthermore, we are the primary beneficiary of the Operating Partnership because we have the obligation to absorb losses and the right to receive benefits from the Operating Partnership and the exclusive power to direct the activities of the Operating Partnership. As of September 30, 2018 and December 31, 2017 , the assets and liabilities of the Company and the Operating Partnership are substantially the same, as the Company does not have any significant assets other than its investment in the Operating Partnership. The accompanying unaudited interim financial statements have been prepared pursuant to the rules and regulations of the United States Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in the financial statements prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) may have been condensed or omitted pursuant to SEC rules and regulations, although we believe that the disclosures are adequate to make their presentation not misleading. The accompanying unaudited financial statements include, in our opinion, all adjustments, consisting of normal recurring adjustments, necessary to present fairly the financial information set forth therein. The results of operations for the interim periods are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 . The interim financial statements should be read in conjunction with the consolidated financial statements in our 2017 Annual Report on Form 10-K and the notes thereto. Any references to the number of properties and square footage are unaudited and outside the scope of our independent registered public accounting firm’s review of our financial statements in accordance with the standards of the United States Public Company Accounting Oversight Board. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Cash and Cash Equivalents Cash and cash equivalents include all cash and liquid investments with an initial maturity of three months or less. The carrying amount approximates fair value due to the short-term maturity of these investments. Restricted Cash Restricted cash is generally comprised of cash proceeds from property sales that are being held by qualified intermediaries for purposes of facilitating tax-deferred like-kind exchanges under Section 1031 of the Internal Revenue Code (“1031 Exchange”). As of September 30, 2018 , we did not have a balance in restricted cash. As of December 31, 2017 , the $250,000 included in restricted cash was related to a non-refundable deposit we received in connection with the execution of a contract to sell our property located at 700 Allen Avenue. Restricted cash balances are included with cash and cash equivalents balances as of the beginning and ending of each period presented in the consolidated statements of cash flows. The following table provides a reconciliation of our cash and cash equivalents and restricted cash as of September 30, 2018 and December 31, 2017 (in thousands): September 30, 2018 December 31, 2017 Cash and cash equivalents $ 183,904 $ 6,620 Restricted cash — 250 Cash, cash equivalents and restricted cash $ 183,904 $ 6,870 Investments in Real Estate Acquisitions Effective January 1, 2017, we adopted Accounting Standards Update (“ASU”) 2017-01, Business Combinations - Clarifying the Definition of a Business (“ASU 2017-01’), which provides a new framework for determining whether transactions should be accounted for as acquisitions of assets or businesses. ASU 2017-01 clarifies that when substantially all of the fair value of the gross assets acquired or disposed of is concentrated in a single identifiable asset or a group of similar assets, the set of assets and activities is not a business. ASU 2017-01 also revises the definition of a business to include, at a minimum, an input and a substantive process that together significantly contribute to the ability to create an output. We evaluated the acquisitions that we completed during the nine months ended September 30, 2018 and determined that under this framework these transactions should be accounted for as asset acquisitions. We expect that most of our property acquisitions will generally not meet the revised definition of a business because substantially all of the fair value is concentrated in a single identifiable asset or group of similar identifiable assets or because the acquisition does not include a substantive process. For acquisitions that are accounted for as asset acquisitions, because they do not meet the business combination accounting criteria, we allocate the cost of the acquisition, which includes the purchase price and associated acquisition transaction costs, to the individual assets acquired and liabilities assumed on a relative fair value basis. These individual assets and liabilities typically include land, building and improvements, tenant improvements, intangible assets and liabilities related to above and below market leases, intangible assets related to in-place leases, and from time to time, assumed debt. As there is no measurement period concept for an asset acquisition, the allocated cost of the acquired assets is finalized in the period in which the acquisition occurs. We determine the fair value of the tangible assets of an acquired property by valuing the property as if it were vacant. This “as-if vacant” value is estimated using an income, or discounted cash flow, approach that relies upon Level 3 inputs, which are unobservable inputs based on the Company’s assumptions about the assumptions a market participant would use. These Level 3 inputs include discount rates, capitalization rates, market rents and comparable sales data for similar properties. Estimates of future cash flows are based on a number of factors including historical operating results, known and anticipated trends, and market and economic conditions. In determining the “as-if-vacant” value for the properties we acquired during the nine months ended September 30, 2018 , we used discount rates ranging from 5.50% to 7.25% and capitalization rates ranging from 4.25% to 6.25% . In determining the fair value of intangible lease assets or liabilities, we also consider Level 3 inputs. Acquired above- and below-market leases are valued based on the present value of the difference between prevailing market rates and the in-place rates measured over a period equal to the remaining term of the lease for above-market leases and the initial term plus the term of any below-market fixed rate renewal options for below-market leases, if applicable. The estimated fair value of acquired in-place at-market tenant leases are the costs that would have been incurred to lease the property to the occupancy level of the property at the date of acquisition. Such estimates include the value associated with leasing commissions, legal and other costs, as well as the estimated period necessary to lease such property to its occupancy level at the time of its acquisition. In determining the fair value of acquisitions completed during the nine months ended September 30, 2018 , we used an estimated average lease-up period ranging from six to 12 months. The difference between the fair value and the face value of debt assumed in connection with an acquisition is recorded as a premium or discount and amortized to “interest expense” over the life of the debt assumed. The valuation of assumed liabilities is based on our estimate of the current market rates for similar liabilities in effect at the acquisition date. Capitalization of Costs We capitalize direct costs incurred in developing, renovating, rehabilitating and improving real estate assets as part of the investment basis. This includes certain general and administrative costs, including payroll, bonus and non-cash equity compensation of the personnel performing development, renovations and rehabilitation if such costs are identifiable to a specific activity to get the real estate asset ready for its intended use. During the development and construction periods of a project, we also capitalize interest, real estate taxes and insurance costs. We cease capitalization of costs upon substantial completion of the project, but no later than one year from cessation of major construction activity. If some portions of a project are substantially complete and ready for use and other portions have not yet reached that stage, we cease capitalizing costs on the completed portion of the project but continue to capitalize for the incomplete portion of the project. Costs incurred in making repairs and maintaining real estate assets are expensed as incurred. We capitalized interest costs of $0.7 million and $0.4 million during the three months ended September 30, 2018 and 2017 , respectively, and $1.6 million and $1.3 million during the nine months ended September 30, 2018 and 2017 , respectively. We capitalized real estate taxes and insurance costs aggregating $0.2 million and $0.3 million during the three months ended September 30, 2018 and 2017 , respectively, and $0.7 million and $0.9 million during the nine months ended September 30, 2018 and 2017 , respectively. We capitalized compensation costs for employees who provide construction services of $0.6 million and $0.5 million during the three months ended September 30, 2018 and 2017 , respectively, and $1.6 million and $1.3 million during the nine months ended September 30, 2018 and 2017 , respectively. Depreciation and Amortization Real estate, including land, building and land improvements, tenant improvements, furniture, fixtures and equipment and intangible lease assets and liabilities are stated at historical cost less accumulated depreciation and amortization, unless circumstances indicate that the cost cannot be recovered, in which case, the carrying value of the property is reduced to estimated fair value as discussed below in our policy with regards to impairment of long-lived assets. We estimate the depreciable portion of our real estate assets and related useful lives in order to record depreciation expense. The values allocated to buildings, site improvements, in-place lease intangibles and tenant improvements are depreciated on a straight-line basis using an estimated remaining life of 10 - 30 years for buildings, 5 - 20 years for site improvements, and the shorter of the estimated useful life or respective lease term for in-place lease intangibles and tenant improvements. As discussed above in— Investments in Real Estate—Acquisitions , in connection with property acquisitions, we may acquire leases with rental rates above or below the market rental rates. Such differences are recorded as an acquired lease intangible asset or liability and amortized to “rental income” over the remaining term of the related leases. Our estimate of the useful life of our assets is evaluated upon acquisition and when circumstances indicate a change in the useful life has occurred, which requires significant judgment regarding the economic obsolescence of tangible and intangible assets. Assets Held for Sale We classify a property as held for sale when all of the criteria set forth in ASC Topic 360: Property, Plant and Equipment (“ASC 360”) have been met. The criteria are as follows: (i) management, having the authority to approve the action, commits to a plan to sell the property; (ii) the property is available for immediate sale in its present condition, subject only to terms that are usual and customary; (iii) an active program to locate a buyer and other actions required to complete the plan to sell have been initiated; (iv) the sale of the property is probable and is expected to be completed within one year; (v) the property is being actively marketed for sale at a price that is reasonable in relation to its current fair value; and (vi) actions necessary to complete the plan of sale indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. At the time we classify a property as held for sale, we cease recording depreciation and amortization. A property classified as held for sale is measured and reported at the lower of its carrying amount or its estimated fair value less cost to sell. See Note 11. Deferred Leasing Costs We capitalize costs directly related to the successful origination of a lease. These costs include leasing commissions paid to third parties for new leases or lease renewals, as well as an allocation of compensation costs, including payroll, bonus and non-cash equity compensation of employees who spend time on lease origination activities. In determining the amount of compensation costs to be capitalized for these employees, allocations are made based on estimates of the actual amount of time spent working on successful leases in comparison to time spent on unsuccessful origination efforts. We capitalized compensation costs for these employees of $0.3 million and $0.3 million during the three months ended September 30, 2018 and 2017 , respectively, and $0.7 million and $0.8 million during the nine months ended September 30, 2018 and 2017 , respectively. Impairment of Long-Lived Assets In accordance with the provisions of the Impairment or Disposal of Long-Lived Assets Subsections of ASC Topic 360: Property, Plant, and Equipment, we assess the carrying values of our respective long-lived assets, including goodwill, whenever events or changes in circumstances indicate that the carrying amounts of these assets may not be fully recoverable. Recoverability of real estate assets is measured by comparison of the carrying amount of the asset to the estimated future undiscounted cash flows. In order to review real estate assets for recoverability, we consider current market conditions as well as our intent with respect to holding or disposing of the asset. The intent with regards to the underlying assets might change as market conditions and other factors change. Fair value is determined through various valuation techniques; including discounted cash flow models, applying a capitalization rate to estimated net operating income of a property, quoted market values and third-party appraisals, where considered necessary. The use of projected future cash flows is based on assumptions that are consistent with estimates of future expectations and the strategic plan used to manage our underlying business. If our analysis indicates that the carrying value of the real estate asset is not recoverable on an undiscounted cash flow basis, we will recognize an impairment charge for the amount by which the carrying value exceeds the current estimated fair value of the real estate property. Assumptions and estimates used in the recoverability analyses for future cash flows, discount rates and capitalization rates are complex and subjective. Changes in economic and operating conditions or our intent with respect to our investment that occur subsequent to our impairment analyses could impact these assumptions and result in future impairment of our real estate properties. Investment in Unconsolidated Real Estate Entities Investment in unconsolidated real estate entities in which we have the ability to exercise significant influence (but not control) are accounted for under the equity method of investment. Under the equity method, we initially record our investment at cost, and subsequently adjust for equity in earnings or losses and cash contributions and distributions. Any difference between the carrying amount of these investments on the balance sheet and the underlying equity in net assets is amortized as an adjustment to equity in income (loss) from unconsolidated real estate entities over the life of the related asset. Under the equity method of accounting, our net equity investment is reflected within the consolidated balance sheets, and our share of net income or loss from the joint venture is included within the consolidated statements of operations. Furthermore, distributions received from equity method investments are classified as either operating cash inflows or investing cash inflows in the consolidated statements of cash flows using the “nature of the distribution approach,” in which each distribution is evaluated on the basis of the source of the payment. Income Taxes We have elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (the “Code”) commencing with our initial taxable year ended December 31, 2013. To qualify as a REIT, we are required (among other things) to distribute at least 90% of our REIT taxable income to our stockholders and meet the various other requirements imposed by the Code relating to matters such as operating results, asset holdings, distribution levels and diversity of stock ownership. Provided we qualify for taxation as a REIT, we are generally not subject to corporate-level income tax on the earnings distributed currently to our stockholders. If we fail to qualify as a REIT in any taxable year, and were unable to avail ourselves of certain savings provisions set forth in the Code, all of our taxable income would be subject to federal income tax at regular corporate rates, including any applicable alternative minimum tax. In addition, we are subject to taxation by various state and local jurisdictions, including those in which we transact business or reside. Our non-taxable REIT subsidiaries, including our Operating Partnership, are either partnerships or disregarded entities for federal income tax purposes. Under applicable federal and state income tax rules, the allocated share of net income or loss from disregarded entities and flow-through entities such as partnerships is reportable in the income tax returns of the respective equity holders. Accordingly, no income tax provision is included in the accompanying consolidated financial statements for the nine months ended September 30, 2018 and 2017 . We periodically evaluate our tax positions to determine whether it is more likely than not that such positions would be sustained upon examination by a tax authority for all open tax years, as defined by the statute of limitations, based on their technical merits. As of September 30, 2018 , and December 31, 2017 , we have not established a liability for uncertain tax positions. Derivative Instruments and Hedging Activities FASB ASC Topic 815: Derivatives and Hedging (“ASC 815”), provides the disclosure requirements for derivatives and hedging activities with the intent to provide users of financial statements with an enhanced understanding of: (a) how and why an entity uses derivative instruments, (b) how the entity accounts for derivative instruments and related hedged items, and (c) how derivative instruments and related hedged items affect an entity’s financial position, financial performance, and cash flows. Further, qualitative disclosures are required that explain the Company’s objectives and strategies for using derivatives, as well as quantitative disclosures about the fair value of and gains and losses on derivative instruments, and disclosures about credit-risk-related contingent features in derivative instruments. As required by ASC 815, we record all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, and whether we have elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. We may enter into derivative contracts that are intended to economically hedge certain risks, even though hedge accounting does not apply or we elect not to apply hedge accounting. See Note 7. Revenue Recognition Our primary sources of revenue are rental income, tenant reimbursements, other income, management, leasing and development services and gains on sale of real estate. Rental Income Minimum annual rental revenues are recognized in rental income on a straight-line basis over the term of the related lease, regardless of when payments are contractually due. Rental revenue recognition commences when the tenant takes possession or controls the physical use of the leased space. Lease termination fees, which are included in rental income, are recognized when the related lease is canceled and we have no continuing obligation to provide services to such former tenant. Tenant Reimbursements Our lease agreements with tenants generally contain provisions that require tenants to reimburse us for certain property expenses. Estimated reimbursements from tenants for real estate taxes, common area maintenance and other recoverable operating expenses are recognized as revenues in the period that the expenses are incurred. Subsequent to year-end, we perform final reconciliations on a lease-by-lease basis and bill or credit each tenant for any cumulative annual adjustments. Other Income Other income primarily consists of late payment fees and other miscellaneous tenant related revenues. Management, leasing and development services We provide property management services and leasing services to related party and third-party property owners, the customer, in exchange for fees and commissions. Property management services include performing property inspections, monitoring repairs and maintenance, negotiating vendor contracts, maintaining tenant relations and providing financial and accounting oversight. For these services, we earn monthly management fees, which are based on a fixed percentage of each managed property’s monthly tenant cash receipts. We have determined that control over the services is passed to the customer simultaneously as performance occurs. Accordingly, management fee revenue is earned as the services are provided to our customers. Leasing commissions are earned when we provide leasing services that result in an executed lease with a tenant. We have determined that control over the services is transferred to the customer upon execution of each lease agreement. We earn leasing commissions based on a fixed percentage of rental income generated for each executed lease agreement and there is no variable income component. Gain or Loss on Sale of Real Estate We account for dispositions of real estate properties, which are considered nonfinancial assets, in accordance with ASC 610-20: Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets and recognize a gain or loss on sale of real estate upon transferring control of the nonfinancial asset to the purchaser, which is generally satisfied at the time of sale. If we were to conduct a partial sale of real estate by transferring a controlling interest in a nonfinancial asset, while retaining a noncontrolling ownership interest, we would measure any noncontrolling interest received or retained at fair value, and recognize a full gain or loss. If we receive consideration before transferring control of a nonfinancial asset, we recognize a contract liability. If we transfer control of the asset before consideration is received, we recognize a contract asset. Valuation of Receivables We may be subject to tenant defaults and bankruptcies that could affect the collection of outstanding receivables. In order to mitigate these risks, we perform credit reviews and analyses on prospective tenants before significant leases are executed and on existing tenants before properties are acquired. We specifically analyze aged receivables, customer credit-worthiness, historical bad debts and current economic trends when evaluating the adequacy of the allowance for doubtful accounts. As a result of our periodic analysis, we maintain an allowance for estimated losses that may result from the inability of our tenants to make required payments. This estimate requires significant judgment related to the lessees’ ability to fulfill their obligations under the leases. We believe our allowance for doubtful accounts is adequate for our outstanding receivables for the periods presented. If a tenant is insolvent or files for bankruptcy protection and fails to make contractual payments beyond any allowance, we may recognize additional bad debt expense in future periods equal to the net outstanding balances, which include amounts recognized as straight-line revenue not realizable until future periods. Rents and other receivables, net and deferred rent receivable, net consisted of the following as of September 30, 2018 and December 31, 2017 (in thousands): September 30, 2018 December 31, 2017 Rents and other receivables $ 6,882 $ 5,369 Allowance for doubtful accounts (1,840 ) (1,705 ) Rents and other receivables, net $ 5,042 $ 3,664 Deferred rent receivable $ 20,877 $ 15,912 Allowance for doubtful accounts (107 ) (86 ) Deferred rent receivable, net $ 20,770 $ 15,826 We recorded the following provision for doubtful accounts, including amounts related to deferred rents, as a reduction to rental revenues in our consolidated statements of operations for the three and nine months ended September 30, 2018 and 2017 (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Provision for doubtful accounts $ 481 $ 231 $ 824 $ 897 Equity Based Compensation We account for equity based compensation in accordance with ASC Topic 718 Compensation - Stock Compensation . Total compensation cost for all share-based awards is based on the estimated fair market value on the grant date. For share-based awards that vest based solely on a service condition, we recognize compensation cost on a straight-line basis over the total requisite service period for the entire award. For share-based awards that vest based on a market or performance condition, we recognize compensation cost on a straight-line basis over the requisite service period of each separately vesting tranche. Forfeitures are recognized in the period in which they occur. See Note 12. Equity Offering Costs Underwriting commissions and offering costs related to our common stock issuances have been reflected as a reduction of additional paid-in capital. Underwriting commissions and offering costs related to our preferred stock issuances have been reflected as a direct reduction of the preferred stock balance. Earnings Per Share We calculate earnings per share (“EPS”) in accordance with ASC 260 - Earnings Per Share (“ASC 260”). Under ASC 260, nonvested share-based payment awards that contain non-forfeitable rights to dividends are participating securities and, therefore, are included in the computation of basic EPS pursuant to the two-class method. The two-class method determines EPS for each class of common stock and participating securities according to dividends declared (or accumulated) and their respective participation rights in undistributed earnings. Basic EPS is calculated by dividing the net income (loss) attributable to common stockholders by the weighted average number of shares of common stock outstanding for the period. Diluted EPS is calculated by dividing the net income (loss) attributable to common stockholders by the weighted average number of shares of common stock outstanding determined for the basic EPS computation plus the effect of any dilutive securities. We include unvested shares of restricted stock and unvested LTIP units in the computation of diluted EPS by using the more dilutive of the two-class method or treasury stock method. We include unvested performance units as contingently issuable shares in the computation of diluted EPS once the market criteria are met, assuming that the end of the reporting period is the end of the contingency period. Any anti-dilutive securities are excluded from the diluted EPS calculation. See Note 13. Segment Reporting Management views the Company as a single reportable segment based on its method of internal reporting in addition to its allocation of capital and resources. Adoption of New Accounting Pronouncements Revenue Recognition On May 28, 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), and subsequently issued additional ASUs which provide practical expedients, technical corrections and clarification of the new standard (collectively “ASC 606”). ASC 606 establishes principles for reporting the nature, amount, timing and uncertainty of revenues and cash flows arising from an entity’s contracts with customers. The core principle of the new standard is that an entity recognizes revenue to represent the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Effective January 1, 2018, we adopted ASC 606 using the modified retrospective approach. We evaluated each of our revenue streams to determine the sources of revenue that are impacted by ASC 606 and concluded that management services and leasing services fall within the scope of ASC 606. We evaluated the impact of ASC 606 on the timing and pattern of revenue recognition for our management and leasing services contracts and determined there was no change in the timing or pattern of revenue recognition for these contracts as compared to prior accounting practice. Accordingly, the adoption of ASC 606 did not have an impact on our consolidated financial statements. See “Revenue Recognition” above for further details. Derecognition of Non-Financial Assets On February 22, 2017, the FASB issued ASU 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets (“ASU 2017-05). ASU 2017-05 clarifies the scope of asset derecognition and adds further guidance for recognizing gains and losses from the transfer of nonfinancial assets in contracts with non-customers. Effective January 1, 2018, we adopted ASU 2017-05 using the modified retrospective approach. There was no cumulative effect adjustment recorded to retained earnings as of January 1, 2018 as a result of the adoption of ASU 2017-05. Derivatives On August 28, 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”). ASU 2017-12 simplifies hedge accounting by eliminating the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. For cash flow hedges, ASU 2017-12 requires all changes in the fair value of the hedging instrument to be deferred in other comprehensive income and recognized in earnings at the same time that the hedged item affects earnings. ASU 2017-12 also eases certain documentation and assessment requirements and

Investments in Real Estate

Investments in Real Estate	9 Months Ended
	Sep. 30, 2018
Investments, All Other Investments [Abstract]
Investments in Real Estate	Investments in Real Estate Acquisitions The following table summarizes the wholly-owned industrial properties we acquired during the nine months ended September 30, 2018 : Property Submarket Date of Acquisition Rentable Square Feet Number of Buildings Contractual Purchase Price (1) (in thousands) 13971 Norton Avenue (2) Inland Empire - West 1/17/2018 103,208 1 $ 11,364 Ontario Airport Commerce Center (3) Inland Empire - West 2/23/2018 213,603 3 24,122 16010 Shoemaker Avenue (4) Los Angeles - Mid-Counties 3/13/2018 115,600 1 17,218 4039 Calle Platino (5) Oceanside 4/4/2018 143,274 1 20,000 851 Lawrence Drive (6) Thousand Oaks 4/5/2018 49,976 1 6,600 1581 North Main Street (6) Orange 4/6/2018 39,661 1 7,150 1580 West Carson Street (7) Long Beach 4/26/2018 43,787 1 7,500 660 & 664 North Twin Oaks Valley Road (6) San Marcos 4/26/2018 96,993 2 14,000 1190 Stanford Court (6) North Orange County 5/8/2018 34,494 1 6,080 5300 Sheila Street (6) Central LA 5/9/2018 695,120 1 121,000 15777 Gateway Circle (4) OC Airport 5/17/2018 37,592 1 8,050 1998 Surveyor Avenue (4)(8) Ventura 5/18/2018 — (8) — (8) 5,821 3100 Fujita Street (4) South Bay 5/31/2018 91,516 1 14,037 4416 Azusa Canyon Road (4) San Gabriel Valley 6/8/2018 70,510 1 12,000 1420 Mckinley Avenue (4) South Bay 6/12/2018 136,685 1 30,000 12154 Montague Street (4) Greater San Fernando Valley 6/29/2018 122,868 1 22,525 10747 Norwalk Boulevard (4) Los Angeles - Mid-Counties 7/18/2018 52,691 1 10,835 29003 Avenue Sherman (4) Greater San Fernando Valley 7/19/2018 68,123 1 9,500 16121 Carmenita Road (4) Los Angeles - Mid-Counties 8/14/2018 108,500 1 13,300 Total 2018 Wholly-Owned Property Acquisitions 2,224,201 21 $ 361,102 (1) Represents the gross contractual purchase price before prorations, closing costs and other acquisition related costs. (2) This acquisition was partially funded through a 1031 Exchange using $10.7 million of net cash proceeds from the sale of our property located at 8900-8980 Benson Avenue and 5637 Arrow Highway and borrowings under our unsecured revolving credit facility. (3) The Ontario Airport Commerce Center is an industrial park which includes two properties located at 1900 Proforma Avenue and 1910-1920 Archibald Avenue. This acquisition was partially funded through a 1031 Exchange using $10.3 million of net cash proceeds from the sale of our property located at 700 Allen Avenue and 1851 Flower Street, borrowings under our unsecured revolving credit facility and available cash on hand. On May 9, 2018, we sold the property located at 1910-1920 Archibald Avenue (see Note 11). (4) This acquisition was funded with available cash on hand. (5) This acquisition was partially funded through a 1031 Exchange using $4.2 million of net cash proceeds from the sale of our property located at 200-220 South Grand Avenue and borrowings under our unsecured revolving credit facility. (6) This acquisition was funded with available cash on hand and borrowings under our unsecured revolving credit facility. (7) This acquisition was partially funded through a 1031 Exchange using $1.6 million of net cash proceeds from the sale of our property located at 6770 Central Avenue—Building B and borrowings under our unsecured revolving credit facility. (8) We acquired 1998 Surveyor Avenue as an under-construction building for a cost of $5.8 million and the assumption of the seller’s fixed-price construction contracts with approximately $4.4 million of remaining costs. At completion, the property will be one single-tenant building containing 56,306 rentable square feet. The following table summarizes the fair value of amounts allocated to each major class of asset and liability for the acquisitions noted in the table above, as of the date of each acquisition (in thousands): 2018 Acquisitions Assets: Land $ 229,331 Buildings and improvements 154,096 Tenant improvements 1,533 Acquired lease intangible assets (1) 19,406 Other acquired assets (2) 103 Total assets acquired 404,469 Liabilities: Acquired lease intangible liabilities (3) 39,467 Other assumed liabilities (2) 1,460 Total liabilities assumed 40,927 Net assets acquired $ 363,542 (1) Acquired lease intangible assets is comprised of $19.3 million of in-place lease intangibles with a weighted average amortization period of 18.3 years and $0.1 million of above-market lease intangibles with a weighted average amortization period of 3.7 years. (2) Includes other working capital assets acquired and liabilities assumed, at the time of acquisition. (3) Represents below-market lease intangibles with a weighted average amortization period of 27.6 years.

Intangible Assets

Intangible Assets	9 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible Assets The following table summarizes our acquired lease intangible assets, including the value of in-place leases and above-market tenant leases, and our acquired lease intangible liabilities, including below-market tenant leases and above-market ground leases (in thousands): September 30, 2018 December 31, 2017 Acquired Lease Intangible Assets: In-place lease intangibles $ 113,505 $ 95,750 Accumulated amortization (64,556 ) (51,735 ) In-place lease intangibles, net $ 48,949 $ 44,015 Above-market tenant leases $ 10,704 $ 10,718 Accumulated amortization (6,251 ) (5,494 ) Above-market tenant leases, net $ 4,453 $ 5,224 Acquired lease intangible assets, net $ 53,402 $ 49,239 Acquired Lease Intangible Liabilities: Below-market tenant leases $ (64,078 ) $ (24,843 ) Accumulated accretion 11,914 6,925 Below-market tenant leases, net $ (52,164 ) $ (17,918 ) Above-market ground lease $ (290 ) $ (290 ) Accumulated accretion 165 141 Above-market ground lease, net $ (125 ) $ (149 ) Acquired lease intangible liabilities, net $ (52,289 ) $ (18,067 ) The following table summarizes the amortization related to our acquired lease intangible assets and liabilities for the reported periods noted below (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 In-place lease intangibles (1) $ 4,115 $ 4,708 $ 13,982 $ 10,812 Net below-market tenant leases (2) $ (1,615 ) $ (877 ) $ (4,330 ) $ (1,179 ) Above-market ground lease (3) $ (8 ) $ (8 ) $ (24 ) $ (24 ) (1) The amortization of in-place lease intangibles is recorded to depreciation and amortization expense in the consolidated statements of operations for the periods presented. (2) The amortization of net below-market tenant leases is recorded as an increase to rental revenues in the consolidated statements of operations for the periods presented. (3) The accretion of the above-market ground lease is recorded as a decrease to property expenses in the consolidated statements of operations for the periods presented.

Notes Payable

Notes Payable	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Notes Payable	Notes Payable The following table summarizes the balance of our indebtedness as of September 30, 2018 and December 31, 2017 (in thousands): September 30, 2018 December 31, 2017 Principal amount $ 761,154 $ 671,658 Less: unamortized discount and debt issuance costs (1) (3,936 ) (2,717 ) Carrying value $ 757,218 $ 668,941 (1) Excludes unamortized debt issuance costs related to our unsecured revolving credit facility, which are presented in the line item “Deferred loan costs, net” in the consolidated balance sheets. The following table summarizes the components and significant terms of our indebtedness as of September 30, 2018 , and December 31, 2017 (dollars in thousands): September 30, 2018 December 31, 2017 Principal Amount Unamortized Discount and Debt Issuance Costs Principal Amount Unamortized Discount and Debt Issuance Costs Contractual Maturity Date Stated Interest Rate (1) Effective Interest Rate (2) Secured Debt $60M Term Loan (3) $ 58,499 $ (242 ) $ 58,891 $ (125 ) 8/1/2023 (4) LIBOR+1.70% 3.70 % Gilbert/La Palma (5) 2,655 (131 ) 2,767 (138 ) 3/1/2031 5.125 % 5.44 % Unsecured Debt $100M Term Loan Facility 100,000 (280 ) 100,000 (343 ) 2/14/2022 LIBOR+1.20% (6) 3.18 % (7) Revolving Credit Facility — — 60,000 — 2/12/2021 (8) LIBOR+1.10% (6)(9) 3.36 % $225M Term Loan Facility 225,000 (1,569 ) 225,000 (1,398 ) 1/14/2023 LIBOR+1.20% (6) 2.74 % (10) $150M Term Loan Facility 150,000 (1,069 ) — — 5/22/2025 LIBOR+1.50% (6) 3.87 % $100M Notes 100,000 (519 ) 100,000 (576 ) 8/6/2025 4.290 % 4.37 % $125M Notes 125,000 (126 ) 125,000 (137 ) 7/13/2027 3.930 % 3.94 % Total $ 761,154 $ (3,936 ) $ 671,658 $ (2,717 ) (1) Reflects the contractual interest rate under the terms of the loan, as of September 30, 2018 . (2) Reflects the effective interest rate as of September 30, 2018 , which includes the effect of the amortization of discounts and debt issuance costs and the effect of interest rate swaps that are effective as of September 30, 2018 . (3) This term loan was modified on June 27, 2018, as further described below under “Modification of $60 Million Term Loan”. This term loan is secured by six properties. As of September 30, 2018 , the interest rate on this variable-rate term loan has been effectively fixed through the use of two interest rate swaps. See Note 7 for details. (4) One 24 -month extension available at the borrower’s option. (5) Monthly payments of interest and principal are based on a 20 -year amortization table. (6) The LIBOR margin will range from 1.20% to 1.70% per annum for the $100.0 million term loan facility, 1.10% to 1.50% per annum for the unsecured revolving credit facility, 1.20% to 1.70% per annum for the $225.0 million term loan facility and 1.50% to 2.20% per annum for the $150.0 million term loan facility, depending on the ratio of our outstanding consolidated indebtedness to the value of our consolidated gross asset value, or leverage ratio, which is measured on a quarterly basis. (7) As of September 30, 2018 , interest on the $100.0 million term loan facility has been effectively fixed through the use of two interest rate swaps. See Note 7 for details. (8) Two additional six -month extensions are available at the borrower’s option. (9) The unsecured revolving credit facility is subject to an applicable facility fee which is calculated as a percentage of the total lenders’ commitment amount, regardless of usage. The applicable facility fee will range from 0.15% to 0.30% per annum depending upon our leverage ratio. (10) As of September 30, 2018 , interest on the $225.0 million term loan facility has been effectively fixed through the use of two interest rate swaps. See Note 7 for details. The following table summarizes the contractual debt maturities and scheduled amortization payments, excluding debt discounts and debt issuance costs, as of September 30, 2018 , and does not consider extension options available to us as noted in the table above (in thousands): October 1, 2018 - December 31, 2018 $ 38 2019 158 2020 166 2021 566 2022 100,967 Thereafter 659,259 Total $ 761,154 Fourth Amendment to Credit Agreement On January 16, 2018, we entered into the Fourth Amendment to Credit Agreement (the “Fourth Amendment”) to amend our Credit Agreement, dated as of January 14, 2016 (as amended from time to time) for our $225.0 million unsecured term loan facility (the “$225 Million Term Loan Facility”). Amounts outstanding under the $225 Million Term Loan Facility bear interest at a rate equal to, at our option, either (i) LIBOR plus an applicable margin that is based upon our leverage ratio or (ii) the Base Rate, as defined in the $225 Million Term Loan Facility, plus an applicable margin that is based on our leverage ratio. The Fourth Amendment decreases the applicable margin for LIBOR-based borrowings from a range of 1.50% to 2.25% per annum to a range of 1.20% to 1.70% per annum and decreases the applicable margin for Base Rate-based borrowings from a range of 0.50% to 1.25% per annum to a range of 0.20% to 0.70% per annum. If we obtain one additional investment grade rating by one or more of Standard & Poor's Financial Services (“S&P”) or Moody's Investor Services (“Moody’s”) to complement our current investment grade Fitch rating, we may elect to convert the pricing structure under the $225 Million Term Loan Facility to be based on such rating. Under this pricing structure, the Fourth Amendment decreases the applicable margin for LIBOR-based borrowings from a range of 1.40% to 2.35% per annum to a range of 0.90% to 1.75% per annum and decreases the applicable margin for Base Rate-based borrowings from a range of 0.40% to 1.35% per annum to a range of 0.00% to 0.75% per annum. $150 Million Term Loan Facility On May 22, 2018, we entered into a credit agreement for a senior unsecured term loan facility (the “$150 Million Term Loan Facility”) that initially permits aggregate borrowings of up to $150.0 million , the total of which we borrowed the same day at closing. Under the terms of the $150 Million Term Loan Facility, we may request additional incremental term loans in an aggregate amount not to exceed $100.0 million . Any increase in borrowings is subject to the satisfaction of specified conditions and the identification of lenders willing to make available such additional amounts. The maturity date of the $150 Million Term Loan Facility is May 22, 2025. Interest on the $150 Million Term Loan Facility is generally to be paid based upon, at our option, either (i) LIBOR plus an applicable Eurodollar rate margin or (ii) the Base Rate (which is defined as the highest of (a) the federal funds rate plus 0.50% , (b) the administrative agent’s prime rate or (c) the Eurodollar Rate plus 1.00% ), plus an applicable base rate margin. The applicable Eurodollar rate margin will range from 1.50% to 2.20% per annum for LIBOR-based borrowings and the applicable base rate margin will range from 0.50% to 1.20% per annum for Base Rate-based loans, depending on our leverage ratio. If we obtain one additional investment grade rating from one or more of S&P or Moody's to complement our current investment grade Fitch rating, we may elect to convert the pricing structure under the $150 Million Term Loan Facility to be based on such rating. Under this pricing structure, the applicable Eurodollar rate margin will range from 1.40% to 2.35% per annum and the applicable base rate margin will range from 0.40% to 1.35% per annum. We have the option to voluntarily prepay any amounts borrowed under the $150 Million Term Loan Facility in whole or in part at any time, subject to certain notice requirements. To the extent that we prepay all or any portion of a loan prior to May 22, 2020, we will pay a prepayment premium equal to (i) if such prepayment occurs prior to May 22, 2019, 2.00% of the principal amount so prepaid, and (ii) if such prepayment occurs on or after May 22, 2019, but prior to May 22, 2020, 1.00% of the principal amount so prepaid. Amounts borrowed under the $150 Million Term Loan Facility and repaid or prepaid may not be reborrowed. The $150 Million Term Loan Facility contains usual and customary events of default including defaults in the payment of principal, interest or fees, defaults in compliance with the covenants set forth in the credit agreement and other loan documentation, cross-defaults to certain other indebtedness, and bankruptcy and other insolvency defaults. If an event of default occurs and is continuing under the $150 Million Term Loan Facility, all outstanding principal amounts, together with all accrued unpaid interest and other amounts owing in respect thereof, may be declared immediately due and payable. Modification of $60 Million Term Loan On June 27, 2018, we entered into the Second Modification Agreement (the “Modification Agreement”) to amend our Term Loan Agreement, dated as of July 24, 2013 (as amended from time to time) for our $60.0 million term loan (the “$60 Million Term Loan”) The Modification Agreement, among other things, (i) extends the maturity date of the $60 Million Term Loan from August 1, 2019, to August 1, 2023, (ii) decreases the interest rate from LIBOR plus 1.90% per annum to LIBOR plus 1.70% per annum, (iii) provides for one 24-month extension option, subject to certain terms and conditions, and (iv) amends the repayment schedule of the $60 Million Term Loan by adding 36 months of interest only payments, followed by equal monthly payments of principal ($65,250 ), plus accrued interest until maturity. Credit Facility We have a $450.0 million senior unsecured credit facility (the “Credit Facility”), comprised of a $350.0 million unsecured revolving credit facility (the “Revolver”) and a $100.0 million unsecured term loan facility (the “$100 Million Term Loan Facility”). The Revolver is scheduled to mature on February 12, 2021 , and has two six-month extension options available, and the $100 Million Term Loan Facility is scheduled to mature on February 14, 2022 . Under the terms of the Credit Facility, we may request additional lender commitments up to an additional aggregate $550.0 million , which may be comprised of additional revolving commitments under the Revolver, an increase to the $100 Million Term Loan Facility, additional term loan tranches or any combination of the foregoing. Interest on the Credit Facility is generally to be paid based upon, at our option, either (i) LIBOR plus an applicable margin that is based upon our leverage ratio or (ii) the Base Rate (which is defined as the highest of (a) the federal funds rate plus 0.50% , (b) the administrative agent’s prime rate or (c) the Eurodollar Rate plus 1.00% ) plus an applicable margin that is based on our leverage ratio. The margins for the Revolver range in amount from 1.10% to 1.50% per annum for LIBOR-based loans and 0.10% to 0.50% per annum for Base Rate-based loans, depending on our leverage ratio. The margins for the $100 Million Term Facility range in amount from 1.20% to 1.70% per annum for LIBOR-based loans and 0.20% to 0.70% per annum for Base Rate-based loans, depending on our leverage ratio. If we attain one additional investment grade rating by one or more of S&P or Moody’s to complement our current investment grade Fitch rating, we may elect to convert the pricing structure under the Credit Facility to be based on such rating. In that event, the margins for the Revolver will range in amount from 0.825% to 1.55% per annum for LIBOR-based loans and 0.00% to 0.55% per annum for Base Rate-based loans, depending on such rating, and the margins for the $100 Million Term Loan Facility will range in amount from 0.90% to 1.75% per annum for LIBOR-based loans and 0.00% to 0.75% per annum for Base Rate-based loans, depending on such rating. In addition to the interest payable on amounts outstanding under the Revolver, we are required to pay an applicable facility fee, based upon our leverage ratio, on each lender's commitment amount under the Revolver, regardless of usage. The applicable facility fee will range in amount from 0.15% to 0.30% per annum, depending on our leverage ratio. In the event that we convert the pricing structure to be based on an investment-grade rating, the applicable facility fee will range in amount from 0.125% to 0.30% per annum, depending on such rating. The Credit Facility is guaranteed by the Company and by substantially all of the current and to-be-formed subsidiaries of the Operating Partnership that own an unencumbered property. The Credit Facility is not secured by the Company’s properties or by equity interests in the subsidiaries that hold such properties. The Revolver and the $100 Million Term Loan Facility may be voluntarily prepaid in whole or in part at any time without premium or penalty. Amounts borrowed under the $100 Million Term Loan Facility and repaid or prepaid may not be reborrowed. The Credit Facility contains usual and customary events of default including defaults in the payment of principal, interest or fees, defaults in compliance with the covenants set forth in the Credit Facility and other loan documentation, cross-defaults to certain other indebtedness, and bankruptcy and other insolvency defaults. If an event of default occurs and is continuing under the Credit Facility, the unpaid principal amount of all outstanding loans, together with all accrued unpaid interest and other amounts owing in respect thereof, may be declared immediately due and payable. On September 30, 2018 , we did not have any borrowings outstanding under the Revolver, leaving $350.0 million available for future borrowings. Debt Covenants The Credit Facility, the $225 Million Term Loan Facility, the $150 Million Term Loan Facility, the $100 million unsecured guaranteed senior notes (the “$100 Million Notes”) and the $125 million unsecured guaranteed senior notes (the “$125 Million Notes”) all include a series of financial and other covenants that we must comply with, including the following covenants which are tested on a quarterly basis: • Maintaining a ratio of total indebtedness to total asset value of not more than 60% ; • For the Credit Facility, the $225 Million Term Loan Facility and the $150 Million Term Loan Facility, maintaining a ratio of secured debt to total asset value of not more than 45% ; • For the $100 Million Notes and the $125 Million Notes, maintaining a ratio of secured debt to total asset value of not more than 40% ; • Maintaining a ratio of total secured recourse debt to total asset value of not more than 15% ; • Maintaining a minimum tangible net worth of at least the sum of (i) $760,740,750 , and (ii) an amount equal to at least 75% of the net equity proceeds received by the Company after September 30, 2016; • Maintaining a ratio of adjusted EBITDA (as defined in each of the loan agreements) to fixed charges of at least 1.5 to 1.0 ; • Maintaining a ratio of total unsecured debt to total unencumbered asset value of not more than 60% ; and • Maintaining a ratio of unencumbered NOI (as defined in each of the loan agreements) to unsecured interest expense of at least 1.75 to 1.00 . The Credit Facility, the $225 Million Term Loan Facility, the $150 Million Term Loan Facility, the $100 Million Notes and the $125 Million Notes also provide that our distributions may not exceed the greater of (i) 95.0% of our funds from operations or (ii) the amount required for us to qualify and maintain our status as a REIT and avoid the payment of federal or state income or excise tax in any 12-month period. Additionally, subject to the terms of the $100 Million Notes and the $125 Million Notes (together the “Notes”), upon certain events of default, including, but not limited to, (i) a default in the payment of any principal, make-whole payment amount, or interest under the Notes, (ii) a default in the payment of certain of our other indebtedness, (iii) a default in compliance with the covenants set forth in the Notes agreement, and (iv) bankruptcy and other insolvency defaults, the principal and accrued and unpaid interest and the make-whole payment amount on the outstanding Notes will become due and payable at the option of the purchasers. The $60 Million Term Loan contains a financial covenant that is tested on a quarterly basis, which requires us to maintain a minimum Debt Service Coverage Ratio (as defined in the term loan agreement) of at least 1.10 to 1.00. We were in compliance with all of our required quarterly debt covenants as of September 30, 2018 .

Operating Leases

Operating Leases	9 Months Ended
	Sep. 30, 2018
Leases, Operating [Abstract]
Operating Leases	Operating Leases We lease space to tenants primarily under non-cancelable operating leases that generally contain provisions for a base rent plus reimbursement for certain operating expenses. Operating expense reimbursements are reflected in the consolidated statements of operations as tenant reimbursements. Future minimum base rent under operating leases as of September 30, 2018 , is summarized as follows (in thousands): Twelve months ended September 30: 2019 $ 168,276 2020 145,541 2021 111,805 2022 77,779 2023 58,081 Thereafter 210,050 Total $ 771,532 The future minimum base rent in the table above excludes tenant reimbursements, amortization of adjustments for deferred rent receivables and the amortization of above/below-market lease intangibles.

Interest Rate Swaps

Interest Rate Swaps	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Interest Rate Swaps	Interest Rate Swaps Risk Management Objective of Using Derivatives We are exposed to certain risks arising from both our business operations and economic conditions. We principally manage our exposures to a wide variety of business and operational risks through management of our core business activities. We manage economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources and duration of our debt funding and through the use of derivative financial instruments. Specifically, we enter into derivative financial instruments to manage exposures that arise from business activities that result in the payment of future known and uncertain cash amounts, the value of which are determined by interest rates. Our derivative financial instruments are used to manage differences in the amount, timing and duration of our known or expected cash payments principally related to our borrowings. Derivative Instruments Our objectives in using interest rate derivatives are to add stability to interest expense and to manage exposure to interest rate movements. To accomplish this objective, we primarily use interest rate swaps as part of our interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for us making fixed-rate payments over the life of the agreements without exchange of the underlying notional value. We do not use derivatives for trading or speculative purposes. The change in fair value of derivatives designated and qualifying as cash flow hedges is initially recorded in accumulated other comprehensive income/(loss) (“AOCI”) and is subsequently reclassified from AOCI into earnings in the period that the hedged forecasted transaction affects earnings. The following table sets forth a summary of our interest rate swaps at September 30, 2018 and December 31, 2017 (dollars in thousands): Current Notional Value (1) Fair Value of Interest Rate Derivative Assets /(Derivative Liabilities) (2) Derivative Instrument Effective Date Maturity Date LIBOR Interest Strike Rate September 30, 2018 December 31, 2017 September 30, 2018 December 31, 2017 Interest Rate Swap 1/15/2015 2/15/2019 1.826 % $ 30,000 $ 30,000 $ 61 $ (11 ) Interest Rate Swap 7/15/2015 2/15/2019 2.010 % $ 28,304 $ 28,891 $ 37 $ (70 ) Interest Rate Swap 8/14/2015 12/14/2018 1.790 % $ 50,000 $ 50,000 $ 49 $ (18 ) Interest Rate Swap 2/16/2016 12/14/2018 2.005 % $ 50,000 $ 50,000 $ 27 $ (120 ) Interest Rate Swap 2/14/2018 1/14/2022 1.349 % $ 125,000 $ — $ 6,037 $ 3,582 Interest Rate Swap 8/14/2018 1/14/2022 1.406 % $ 100,000 $ — $ 4,673 $ 2,521 Interest Rate Swap 12/14/2018 8/14/2021 1.764 % $ — $ — $ 2,967 $ 1,090 (1) Represents the notional value of swaps that are effective as of the balance sheet date presented. (2) The fair value of derivative assets are included in the line item “Interest rate swap asset” in the accompanying consolidated balance sheets and the fair value of (derivative liabilities) are included in the line item “Interest rate swap liability” in the accompanying consolidated balance sheets. The following table sets forth the impact of our interest rate swaps on our consolidated statements of operations for the periods presented (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Interest Rate Swaps in Cash Flow Hedging Relationships: Amount of gain (loss) recognized in AOCI on derivatives $ 1,212 $ 382 $ 7,382 $ (672 ) Amount of gain (loss) reclassified from AOCI into earnings under “Interest expense” $ 397 $ (280 ) $ 505 $ (1,090 ) Total interest expense presented in the Consolidated Statement of Operations in which the effects of cash flow hedges are recorded (line item “Interest expense”) $ 6,456 $ 6,271 $ 18,760 $ 14,571 During the next twelve months, we estimate that an additional $3.7 million will be reclassified from AOCI into earnings as a decrease to interest expense. Offsetting Derivatives We enter into master netting arrangements, which reduce credit risk by permitting net settlement of transactions with the same counterparty. Derivative instruments that are subject to master netting arrangements and qualify for net presentation in the consolidated balance sheets are presented on a gross basis in the consolidated balance sheets as of September 30, 2018 and December 31, 2017 . The following tables present information about the potential effects of netting if we were to offset our interest rate swap assets and interest rate swap liabilities in the accompanying consolidated balance sheets as of September 30, 2018 and December 31, 2017 (in thousands). Gross Amounts Not Offset in the Balance Sheet Offsetting of Derivative Assets Gross Amounts of Recognized Assets Gross Amounts Offset in the Balance Sheet Net Amounts of Assets Presented in the Balance Sheet Financial Instruments Cash Collateral Received Net Amount September 30, 2018 Interest rate swaps 13,851 — 13,851 — — 13,851 December 31, 2017 Interest rate swaps 7,193 — 7,193 (219 ) — 6,974 Gross Amounts Not Offset in the Balance Sheet Offsetting of Derivative Liabilities Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Balance Sheet Net Amounts of Assets Presented in the Balance Sheet Financial Instruments Cash Collateral Received Net Amount September 30, 2018 Interest rate swaps — — — — — — December 31, 2017 Interest rate swaps 219 — 219 (219 ) — — Credit-risk-related Contingent Features Certain of our agreements with our derivative counterparties contain a provision where if we default on any of our indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender within a specified time period, then we could also be declared in default on its derivative obligations. Certain of our agreements with our derivative counterparties contain provisions where if a merger or acquisition occurs that materially changes our creditworthiness in an adverse manner, we may be required to fully collateralize our obligations under the derivative instrument.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements We have adopted FASB Accounting Standards Codification Topic 820: Fair Value Measurements and Disclosure (“ASC 820”). ASC 820 defines fair value, establishes a framework for measuring fair value, and expands disclosures about fair value measurements. ASC 820 applies to reported balances that are required or permitted to be measured at fair value under existing accounting pronouncements; accordingly, the standard does not require any new fair value measurements of reported balances. ASC 820 emphasizes that fair value is a market-based measurement, not an entity-specific measurement. Therefore, a fair value measurement should be determined based on the assumptions that market participants would use in pricing the asset or liability. As a basis for considering market participant assumptions in fair value measurements, ASC 820 establishes a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within Levels 1 and 2 of the hierarchy) and the reporting entity’s own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy). Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access. Level 2 inputs are inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs may include quoted prices for similar assets and liabilities in active markets, as well as inputs that are observable for the asset or liability (other than quoted prices), such as interest rates and yield curves that are observable at commonly quoted intervals. Level 3 inputs are unobservable inputs for the asset or liability, which are typically based on an entity’s own assumptions, as there is little, if any, related market activity. In instances where the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. Recurring Measurements – Interest Rate Swaps Currently, we use interest rate swap agreements to manage our interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. To comply with the provisions of ASC 820, we incorporate credit valuation adjustments to appropriately reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of our derivative contracts for the effect of nonperformance risk, we have considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees. 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 ourselves and our counterparties. However, as of September 30, 2018 , 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 its derivatives. As a result, we have determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. The table below sets forth the estimated fair value of our interest rate swaps as of September 30, 2018 and December 31, 2017 , which we measure on a recurring basis by level within the fair value hierarchy (in thousands). Fair Value Measurement Using Total Fair Value Quoted Price in Active Markets for Identical Assets and Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) September 30, 2018 Interest Rate Swap Asset $ 13,851 $ — $ 13,851 $ — Interest Rate Swap Liability $ — $ — $ — $ — December 31, 2017 Interest Rate Swap Asset $ 7,193 $ — $ 7,193 $ — Interest Rate Swap Liability $ (219 ) $ — $ (219 ) $ — Financial Instruments Disclosed at Fair Value The carrying amounts of cash and cash equivalents, rents and other receivables, other assets, accounts payable, accrued expenses and other liabilities, and tenant security deposits approximate fair value because of their short-term nature. The fair value of our notes payable was estimated by calculating the present value of principal and interest payments, using discount rates that best reflect current market rates for financings with similar characteristics and credit quality, and assuming each loan is outstanding through its respective contractual maturity date. The table below sets forth the carrying value and the estimated fair value of our notes payable as of September 30, 2018 and December 31, 2017 (in thousands): Fair Value Measurement Using Liabilities Total Fair Value Quoted Price in Active Markets for Identical Assets and Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Carrying Value Notes Payable at: September 30, 2018 $ 752,722 $ — $ — $ 752,722 $ 757,218 December 31, 2017 $ 673,377 $ — $ — $ 673,377 $ 668,941

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Howard Schwimmer We engage in transactions with Howard Schwimmer, our Co-Chief Executive Officer, earning management fees and leasing commissions from entities controlled individually by Mr. Schwimmer. Fees and commissions earned from these entities are included in “Management, leasing and development services” in the consolidated statements of operations. We recorded $0.1 million and $0.1 million for the three months ended September 30, 2018 and 2017 , respectively, and $0.3 million and $0.3 million for the nine months ended September 30, 2018 and 2017 , respectively, in management, leasing and development services revenue.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal From time to time, we are party to various lawsuits, claims and legal proceedings that arise in the ordinary course of business. We are not currently a party to any legal proceedings that we believe would reasonably be expected to have a material adverse effect on our business, financial condition or results of operations. Environmental We generally will perform environmental site assessments at properties we are considering acquiring. After the acquisition of such properties, we continue to monitor the properties for the presence of hazardous or toxic substances. From time to time, we acquire properties with known adverse environmental conditions. If at the time of acquisition, losses associated with environmental remediation obligations are probable and can be reasonably estimated, we record a liability. On February 25, 2014, we acquired the property located at West 228th Street. Before purchasing the property during the due diligence phase, we engaged a third party environmental consultant to perform various environmental site assessments to determine the presence of any environmental contaminants that might warrant remediation efforts. Based on their investigation, they determined that hazardous substances existed at the property and that additional assessment and remediation work would likely be required to satisfy regulatory requirements. The total remediation costs were estimated to be $1.3 million , which includes remediation, processing and oversight costs. To address the estimated costs associated with the environmental issues at the West 228t h Street property, we entered into an Environmental Holdback Escrow Agreement (the “Holdback Agreement”) with the former owner, whereby $1.4 million was placed into an escrow account to be used to pay remediation costs. To fund the $1.4 million , the escrow holder withheld $1.3 million of the purchase price, which would have otherwise been paid to the seller at closing, and the Company funded an additional $0.1 million . According to the Holdback Agreement, the seller has no liability or responsibility to pay for remediation costs in excess of $1.3 million . As of September 30, 2018 , and December 31, 2017 , we had a $1.1 million and $1.1 million contingent liability recorded in our consolidated balance sheets included in the line item “Accounts payable and accrued expenses,” reflecting the estimated remaining cost to remediate environmental liabilities at West 228t h Street that existed prior to the acquisition date. As of September 30, 2018 , and December 31, 2017 , we also had a $1.1 million and $1.1 million corresponding indemnification asset recorded in our consolidated balance sheets included in the line item “Other assets,” reflecting the estimated costs we expect the former owner to cover pursuant to the Holdback Agreement. We expect that the resolution of the environmental matters relating to the above will not have a material impact on our consolidated financial condition, results of operations or cash flows. However, we cannot assure you that we have identified all environmental liabilities at our properties, that all necessary remediation actions have been or will be undertaken at our properties or that we will be indemnified, in full or at all, in the event that such environmental liabilities arise. Furthermore, we cannot assure you that future changes to environmental laws or regulations and their application will not give rise to loss contingencies for future environmental remediation. Rent Expense As of September 30, 2018 , we lease a parcel of land that is currently being sub-leased to a tenant for a parking lot. The ground lease is scheduled to expire on June 1, 2062 . We recognized rental expense for our ground lease in the amount of $36 thousand and $36 thousand for the three months ended September 30, 2018 and 2017 , respectively, and $0.1 million and $0.1 million for the nine months ended September 30, 2018 and 2017 , respectively. As part of conducting our day-to-day business, we also lease office space under operating leases. We recognized rental expense for our office space leases in the amount of $0.2 million and $0.1 million for the three months ended September 30, 2018 and 2017 , respectively, and $0.5 million and $0.3 million for the nine months ended September 30, 2018 and 2017 , respectively. The future minimum commitment under our ground lease and office space leases as of September 30, 2018 , is as follows (in thousands): Office Leases Ground Lease October 1, 2018 - December 31, 2018 $ 223 $ 36 2019 660 144 2020 257 144 2021 167 144 2022 — 144 Thereafter — 5,676 Total $ 1,307 $ 6,288 Tenant and Construction Related Commitments As of September 30, 2018 , we had commitments of approximately $25.5 million for tenant improvement and construction work under the terms of leases with certain of our tenants and contractual agreements with our construction vendors. Concentrations of Credit Risk We have deposited cash with financial institutions that are insured by the Federal Deposit Insurance Corporation up to $250,000 per institution. Although we have deposits at institutions in excess of federally insured limits as of September 30, 2018 , we do not believe we are exposed to significant credit risk due to the financial position of the institutions in which those deposits are held. As of September 30, 2018 , all of our properties are located in the Southern California infill markets. The ability of the tenants to honor the terms of their respective leases is dependent upon the economic, regulatory and social factors affecting the markets in which the tenants operate. During the nine months ended September 30, 2018 , no single tenant accounted for more than 5% of our total consolidated rental revenues.

Dispositions and Real Estate He

Dispositions and Real Estate Held For Sale	9 Months Ended
	Sep. 30, 2018
Discontinued Operations and Disposal Groups [Abstract]
Dispositions and Real Estate Held For Sale	Dispositions and Real Estate Held for Sale Dispositions The following table summarizes the properties we sold during the nine months ended September 30, 2018 : Property Submarket Date of Disposition Rentable Square Feet Contractual Sales Price (1) (in thousands) Gain Recorded (in thousands) 8900-8980 Benson Avenue and 5637 Arrow Highway Inland Empire West 1/2/2018 88,016 $ 11,440 $ 4,029 700 Allen Avenue and 1851 Flower Street Los Angeles - San Fernando Valley 1/17/2018 25,168 $ 10,900 $ 4,753 200-220 South Grand Avenue Orange County - Airport 3/7/2018 27,200 $ 4,515 $ 1,201 6770 Central Avenue—Building B Inland Empire West 4/9/2018 11,808 $ 1,676 $ 1,113 1910-1920 Archibald Avenue Inland Empire West 5/9/2018 78,243 $ 9,050 $ 495 Total 230,435 $ 37,581 $ 11,591 (1) Represents the gross contractual sales price before commissions, prorations and other closing costs. Real Estate Held for Sale As of December 31, 2017, our properties located at (i) 700 Allen Avenue and 1830 Flower Street and (ii) 8900-8980 Benson Avenue and 5637 Arrow Highway were classified as held for sale. We did not have any properties classified as held for sale as of September 30, 2018 . The following table summarizes the major classes of assets and liabilities associated with real estate properties classified as held for sale (in thousands): December 31, 2017 Land $ 5,671 Buildings and improvements 7,180 Tenant improvements 429 Construction in progress 16 Real estate held for sale 13,296 Accumulated depreciation (1,609 ) Real estate held for sale, net 11,687 Acquired lease intangible assets, net 71 Other assets associated with real estate held for sale 678 Total assets associated with real estate held for sale, net $ 12,436 Tenant security deposits $ 193 Other liabilities associated with real estate held for sale 50 Total liabilities associated with real estate held for sale $ 243

Equity

Equity	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Equity	Equity Common Stock On June 13, 2018, we established a new at-the-market equity offering program (the “$400 Million ATM Program”) pursuant to which we may sell from time to time up to an aggregate of $400.0 million of our common stock through sales agents. The $400 Million ATM Program replaces our previous $300 million at-the-market equity offering program which was established on September 21, 2017 (the “Prior ATM Program”). All $300.0 million of shares of our common stock under the Prior ATM Program were sold prior to establishing the $400 Million ATM Program. During the nine months ended September 30, 2018 , we sold a total of 14,081,074 shares of our common stock under the $400 Million ATM Program and the Prior ATM Program, at a weighted average price of $30.70 per share, for gross proceeds of $432.3 million , and net proceeds of $425.8 million , after deducting the sales agents’ fee. As of September 30, 2018 , we had the capacity to issue up to an additional $196.8 million of common stock under the $400 Million ATM Program. Actual sales going forward, if any, will depend on a variety of factors, including among others, market conditions, the trading price of our common stock, determinations by us of the appropriate sources of funding for us and potential uses of funding available to us. Noncontrolling Interests Noncontrolling interests in our Operating Partnership relate to interests in the Operating Partnership that are not owned by us. As of September 30, 2018 , noncontrolling interests consisted of 1,845,565 OP Units and 157,539 fully-vested LTIP units and represented approximately 2.1% of our Operating Partnership. OP Units and shares of our common stock have essentially the same economic characteristics, as they share equally in the total net income or loss and distributions of our Operating Partnership. Investors who own OP Units have the right to cause our Operating Partnership to redeem any or all of their units in our Operating Partnership for an amount of cash per unit equal to the then current market value of one share of common stock, or, at our election, shares of our common stock on a one-for-one basis. During the nine months ended September 30, 2018 , 60,175 OP Units were converted into an equivalent number of shares of common stock, resulting in the reclassification of $0.6 million of noncontrolling interest to Rexford Industrial Realty, Inc.’s stockholders’ equity. Amended and Restated 2013 Incentive Award Plan On June 11, 2018, our stockholders approved the Amended and Restated Rexford Industrial Realty, Inc. and Rexford Industrial Realty, L.P. 2013 Incentive Award Plan (the “Plan”), superseding and replacing the Rexford Industrial Realty, Inc. and Rexford Industrial Realty, L.P. 2013 Incentive Award Plan (the “Prior Plan”). Pursuant to the Plan, we may continue to make grants of stock options, restricted stock, dividend equivalents, stock payments, restricted stock units, performance shares, LTIP units of partnership interest in our Operating Partnership (“LTIP units”), performance units in our Operating Partnership (“Performance Units”), and other stock based and cash awards to our non-employee directors, employees and consultants. The aggregate number of shares of our common stock, LTIP units and Performance Units that may be issued or transferred pursuant to the Plan is 1,770,000 , plus any shares that have not been issued under the Prior Plan, including shares subject to outstanding awards under the Prior Plan that are not issued or delivered to a participant for any reason or that are forfeited by a participant prior to vesting. As of September 30, 2018 , a total of 2,162,877 shares of common stock, LTIP units and Performance Units remain available for issuance. Shares of our restricted common stock generally may not be sold, pledged, assigned or transferred in any manner other than by will or the laws of descent and distribution or, subject to the consent of the administrator of the Plan, a domestic relations order, unless and until all restrictions applicable to such shares have lapsed. Such restrictions generally expire upon vesting. Shares of our restricted common stock are participating securities and have full voting rights and nonforfeitable rights to dividends. LTIP units and Performance Units are each a class of limited partnership units in the Operating Partnership. Initially, LTIP units and Performance Units do not have full parity with OP Units with respect to liquidating distributions. However, upon the occurrence of certain events described in the Operating Partnership’s partnership agreement, the LTIP units and Performance Units can over time achieve full parity with the OP Units for all purposes. If such parity is reached, vested LTIP units and Performance Units may be converted into an equal number of OP Units, and, upon conversion, enjoy all rights of OP Units. LTIP Units, whether vested or not, receive the same quarterly per-unit distributions as OP Units, which equal the per-share distributions on shares of our common stock. Performance Units that have not vested receive a quarterly per-unit distribution equal to 10% of the distributions paid on OP Units. The following table sets forth our share-based award activity for the nine months ended September 30, 2018 : Unvested Awards Restricted Common Stock LTIP Units Performance Units Balance at January 1, 2018 190,695 293,485 703,248 Granted 103,443 57,443 — Forfeited (13,031 ) — — Vested (1) (71,893 ) (45,034 ) — Balance at September 30, 2018 209,214 305,894 703,248 (1) During the nine months ended September 30, 2018 , 20,663 shares of the Company’s common stock were tendered in accordance with the terms of the Plan to satisfy minimum statutory tax withholding requirements associated with the vesting of restricted shares of common stock. The following table sets forth the vesting schedule of all unvested share-based awards outstanding as of September 30, 2018 : Unvested Awards Restricted LTIP Units Performance Units (1) October 1, 2018 - December 31, 2018 9,933 111,721 315,998 2019 82,678 114,818 199,000 2020 55,622 73,151 188,250 2021 39,409 3,102 — 2022 21,572 3,102 — Total 209,214 305,894 703,248 (1) Represents the maximum number of Performance Units that would become earned and vested on December 14, 2018, December 28, 2019 and December 14, 2020, in the event that the specified maximum total shareholder return (“TSR”) goals are achieved over the three-year performance period from December 15, 2015 through December 14, 2018, the three-year performance period from December 29, 2016 through December 28, 2019, and the three-year performance period from December 15, 2017 through December 14, 2020, respectively. The number of Performance Units that ultimately vest will be based on both the Company’s absolute TSR and the Company’s TSR performance relative to a peer group over each three-year performance period. The maximum number of Performance Units will be earned only if the Company both (i) achieves 50% or higher absolute TSR, inclusive of all dividends paid, over each three-year performance period with respect to the awards vesting on December 14, 2018 and December 28, 2019, and achieves 36% or higher absolute TSR, inclusive of all dividends paid, over the three-year performance period with respect to the awards vesting on December 14, 2020, and (ii) finishes in the 75 th or greater percentile of the peer group for TSR over each three-year performance period. The following table sets forth the amounts expensed and capitalized for all share-based awards for the reported periods presented below (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Expensed share-based compensation (1) $ 2,243 $ 1,329 $ 7,866 $ 4,070 Capitalized share-based compensation (2) 73 7 183 120 Total share-based compensation $ 2,316 $ 1,336 $ 8,049 $ 4,190 (1) Amounts expensed are included in “General and administrative” and “Property expenses” in the accompanying consolidated statements of operations. (2) Amounts capitalized, which relate to employees who provide construction and leasing services, are included in “Building and improvements” and “Deferred leasing costs, net” in the consolidated balance sheets. As of September 30, 2018 , total unrecognized compensation cost related to all unvested share-based awards was $9.8 million and is expected to be recognized over a weighted average remaining period of 25 months . Changes in Accumulated Other Comprehensive Income The following table summarizes the changes in our AOCI balance for the nine months ended September 30, 2018 and 2017 , which consists solely of adjustments related to our cash flow hedges (in thousands): Nine Months Ended September 30, 2018 2017 Accumulated other comprehensive income - beginning balance $ 6,799 $ 3,445 Other comprehensive income (loss) before reclassifications 7,382 (672 ) Amounts reclassified from accumulated other comprehensive income to interest expense (505 ) 1,090 Net current period other comprehensive income (loss) 6,877 418 Less other comprehensive (income) loss attributable to noncontrolling interests (118 ) 7 Other comprehensive income (loss) attributable to common stockholders 6,759 425 Accumulated other comprehensive income - ending balance $ 13,558 $ 3,870

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table sets forth the computation of basic and diluted earnings per share (in thousands, except share and per share amounts): Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Numerator: Net income $ 8,965 $ 2,009 $ 31,868 $ 27,585 Less: Preferred stock dividends (2,423 ) (1,322 ) (7,270 ) (3,966 ) Less: Net income attributable to noncontrolling interests (141 ) (21 ) (588 ) (684 ) Less: Net income attributable to participating securities (94 ) (80 ) (285 ) (327 ) Net income attributable to common stockholders $ 6,307 $ 586 $ 23,725 $ 22,608 Denominator: Weighted average shares of common stock outstanding – basic 91,463,594 72,621,219 84,407,429 68,984,047 Effect of dilutive securities - performance units 481,612 446,862 518,043 380,808 Weighted average shares of common stock outstanding – diluted 91,945,206 73,068,081 84,925,472 69,364,855 Earnings per share — Basic Net income attributable to common stockholders $ 0.07 $ 0.01 $ 0.28 $ 0.33 Earnings per share — Diluted Net income attributable to common stockholders $ 0.07 $ 0.01 $ 0.28 $ 0.33 Unvested share-based payment awards that contain non-forfeitable rights to dividends, whether paid or unpaid, are accounted for as participating securities. As such, unvested shares of restricted stock, unvested LTIP Units and unvested Performance Units are considered participating securities. Participating securities are included in the computation of basic EPS pursuant to the two-class method. The two-class method determines EPS for each class of common stock and each participating security according to dividends declared (or accumulated) and their respective participation rights in undistributed earnings. Participating securities are also included in the computation of diluted EPS using the more dilutive of the two-class method or treasury stock method for unvested shares of restricted stock and LTIP Units, and by determining if certain market conditions have been met at the reporting date for unvested Performance Units. The effect of including unvested shares of restricted stock and unvested LTIP Units using the treasury stock method was excluded from our calculation of weighted average shares of common stock outstanding – diluted, as their inclusion would have been anti-dilutive. Performance Units, which are subject to vesting based on the Company achieving certain TSR levels over a three -year performance period, are included as contingently issuable shares in the calculation of diluted EPS when TSR has been achieved at or above the threshold levels specified in the award agreements, assuming the reporting period is the end of the performance period, and the effect is dilutive. We also consider the effect of other potentially dilutive securities, including OP Units, which may be redeemed for shares of our common stock under certain circumstances, and include them in our computation of diluted EPS when their inclusion is dilutive.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Acquisitions On October 17, 2018 , we acquired the property located at 1332-1340 Rocky Point Drive in Oceanside , California for a contract price of $10.2 million . The property consists of one single-tenant building with 73,747 rentable square feet. Dividends Declared On October 29, 2018 , our board of directors declared a quarterly cash dividend of $0.16 per share of common stock and a quarterly cash distribution of $0.16 per OP Unit, to be paid on January 15, 2019 , to holders of record as of December 31, 2018 . Also, on October 29, 2018 , our board of directors declared a quarterly cash dividend of $0.367188 per share of our 5.875% Series A Cumulative Redeemable Preferred Stock and $0.367188 per share of our 5.875% Series B Cumulative Redeemable Preferred Stock, to be paid on December 31, 2018 , to preferred stockholders of record as of December 14, 2018 .

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation As of September 30, 2018 , and December 31, 2017 , and for the three and nine months ended September 30, 2018 and 2017 , the financial statements presented are the consolidated financial statements of Rexford Industrial Realty, Inc. and its subsidiaries, including our Operating Partnership. All significant intercompany balances and transactions have been eliminated in the consolidated financial statements. Under consolidation guidance, we have determined that our Operating Partnership is a variable interest entity because the holders of limited partnership interests do not have substantive kick-out rights or participating rights. Furthermore, we are the primary beneficiary of the Operating Partnership because we have the obligation to absorb losses and the right to receive benefits from the Operating Partnership and the exclusive power to direct the activities of the Operating Partnership. As of September 30, 2018 and December 31, 2017 , the assets and liabilities of the Company and the Operating Partnership are substantially the same, as the Company does not have any significant assets other than its investment in the Operating Partnership. The accompanying unaudited interim financial statements have been prepared pursuant to the rules and regulations of the United States Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in the financial statements prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) may have been condensed or omitted pursuant to SEC rules and regulations, although we believe that the disclosures are adequate to make their presentation not misleading. The accompanying unaudited financial statements include, in our opinion, all adjustments, consisting of normal recurring adjustments, necessary to present fairly the financial information set forth therein. The results of operations for the interim periods are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 . The interim financial statements should be read in conjunction with the consolidated financial statements in our 2017 Annual Report on Form 10-K and the notes thereto. Any references to the number of properties and square footage are unaudited and outside the scope of our independent registered public accounting firm’s review of our financial statements in accordance with the standards of the United States Public Company Accounting Oversight Board.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include all cash and liquid investments with an initial maturity of three months or less. The carrying amount approximates fair value due to the short-term maturity of these investments.
Restricted Cash	Restricted Cash Restricted cash is generally comprised of cash proceeds from property sales that are being held by qualified intermediaries for purposes of facilitating tax-deferred like-kind exchanges under Section 1031 of the Internal Revenue Code (“1031 Exchange”). As of September 30, 2018 , we did not have a balance in restricted cash. As of December 31, 2017 , the $250,000 included in restricted cash was related to a non-refundable deposit we received in connection with the execution of a contract to sell our property located at 700 Allen Avenue.
Investments in Real Estate	Investments in Real Estate Acquisitions Effective January 1, 2017, we adopted Accounting Standards Update (“ASU”) 2017-01, Business Combinations - Clarifying the Definition of a Business (“ASU 2017-01’), which provides a new framework for determining whether transactions should be accounted for as acquisitions of assets or businesses. ASU 2017-01 clarifies that when substantially all of the fair value of the gross assets acquired or disposed of is concentrated in a single identifiable asset or a group of similar assets, the set of assets and activities is not a business. ASU 2017-01 also revises the definition of a business to include, at a minimum, an input and a substantive process that together significantly contribute to the ability to create an output. We evaluated the acquisitions that we completed during the nine months ended September 30, 2018 and determined that under this framework these transactions should be accounted for as asset acquisitions. We expect that most of our property acquisitions will generally not meet the revised definition of a business because substantially all of the fair value is concentrated in a single identifiable asset or group of similar identifiable assets or because the acquisition does not include a substantive process. For acquisitions that are accounted for as asset acquisitions, because they do not meet the business combination accounting criteria, we allocate the cost of the acquisition, which includes the purchase price and associated acquisition transaction costs, to the individual assets acquired and liabilities assumed on a relative fair value basis. These individual assets and liabilities typically include land, building and improvements, tenant improvements, intangible assets and liabilities related to above and below market leases, intangible assets related to in-place leases, and from time to time, assumed debt. As there is no measurement period concept for an asset acquisition, the allocated cost of the acquired assets is finalized in the period in which the acquisition occurs. We determine the fair value of the tangible assets of an acquired property by valuing the property as if it were vacant. This “as-if vacant” value is estimated using an income, or discounted cash flow, approach that relies upon Level 3 inputs, which are unobservable inputs based on the Company’s assumptions about the assumptions a market participant would use. These Level 3 inputs include discount rates, capitalization rates, market rents and comparable sales data for similar properties. Estimates of future cash flows are based on a number of factors including historical operating results, known and anticipated trends, and market and economic conditions. In determining the “as-if-vacant” value for the properties we acquired during the nine months ended September 30, 2018 , we used discount rates ranging from 5.50% to 7.25% and capitalization rates ranging from 4.25% to 6.25% . In determining the fair value of intangible lease assets or liabilities, we also consider Level 3 inputs. Acquired above- and below-market leases are valued based on the present value of the difference between prevailing market rates and the in-place rates measured over a period equal to the remaining term of the lease for above-market leases and the initial term plus the term of any below-market fixed rate renewal options for below-market leases, if applicable. The estimated fair value of acquired in-place at-market tenant leases are the costs that would have been incurred to lease the property to the occupancy level of the property at the date of acquisition. Such estimates include the value associated with leasing commissions, legal and other costs, as well as the estimated period necessary to lease such property to its occupancy level at the time of its acquisition. In determining the fair value of acquisitions completed during the nine months ended September 30, 2018 , we used an estimated average lease-up period ranging from six to 12 months. The difference between the fair value and the face value of debt assumed in connection with an acquisition is recorded as a premium or discount and amortized to “interest expense” over the life of the debt assumed. The valuation of assumed liabilities is based on our estimate of the current market rates for similar liabilities in effect at the acquisition date. Capitalization of Costs We capitalize direct costs incurred in developing, renovating, rehabilitating and improving real estate assets as part of the investment basis. This includes certain general and administrative costs, including payroll, bonus and non-cash equity compensation of the personnel performing development, renovations and rehabilitation if such costs are identifiable to a specific activity to get the real estate asset ready for its intended use. During the development and construction periods of a project, we also capitalize interest, real estate taxes and insurance costs. We cease capitalization of costs upon substantial completion of the project, but no later than one year from cessation of major construction activity. If some portions of a project are substantially complete and ready for use and other portions have not yet reached that stage, we cease capitalizing costs on the completed portion of the project but continue to capitalize for the incomplete portion of the project. Costs incurred in making repairs and maintaining real estate assets are expensed as incurred. We capitalized interest costs of $0.7 million and $0.4 million during the three months ended September 30, 2018 and 2017 , respectively, and $1.6 million and $1.3 million during the nine months ended September 30, 2018 and 2017 , respectively. We capitalized real estate taxes and insurance costs aggregating $0.2 million and $0.3 million during the three months ended September 30, 2018 and 2017 , respectively, and $0.7 million and $0.9 million during the nine months ended September 30, 2018 and 2017 , respectively. We capitalized compensation costs for employees who provide construction services of $0.6 million and $0.5 million during the three months ended September 30, 2018 and 2017 , respectively, and $1.6 million and $1.3 million during the nine months ended September 30, 2018 and 2017 , respectively. Depreciation and Amortization Real estate, including land, building and land improvements, tenant improvements, furniture, fixtures and equipment and intangible lease assets and liabilities are stated at historical cost less accumulated depreciation and amortization, unless circumstances indicate that the cost cannot be recovered, in which case, the carrying value of the property is reduced to estimated fair value as discussed below in our policy with regards to impairment of long-lived assets. We estimate the depreciable portion of our real estate assets and related useful lives in order to record depreciation expense. The values allocated to buildings, site improvements, in-place lease intangibles and tenant improvements are depreciated on a straight-line basis using an estimated remaining life of 10 - 30 years for buildings, 5 - 20 years for site improvements, and the shorter of the estimated useful life or respective lease term for in-place lease intangibles and tenant improvements. As discussed above in— Investments in Real Estate—Acquisitions , in connection with property acquisitions, we may acquire leases with rental rates above or below the market rental rates. Such differences are recorded as an acquired lease intangible asset or liability and amortized to “rental income” over the remaining term of the related leases. Our estimate of the useful life of our assets is evaluated upon acquisition and when circumstances indicate a change in the useful life has occurred, which requires significant judgment regarding the economic obsolescence of tangible and intangible assets.
Assets Held for Sale	Assets Held for Sale We classify a property as held for sale when all of the criteria set forth in ASC Topic 360: Property, Plant and Equipment (“ASC 360”) have been met. The criteria are as follows: (i) management, having the authority to approve the action, commits to a plan to sell the property; (ii) the property is available for immediate sale in its present condition, subject only to terms that are usual and customary; (iii) an active program to locate a buyer and other actions required to complete the plan to sell have been initiated; (iv) the sale of the property is probable and is expected to be completed within one year; (v) the property is being actively marketed for sale at a price that is reasonable in relation to its current fair value; and (vi) actions necessary to complete the plan of sale indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. At the time we classify a property as held for sale, we cease recording depreciation and amortization. A property classified as held for sale is measured and reported at the lower of its carrying amount or its estimated fair value less cost to sell. See Note 11.
Deferred Leasing Costs	Deferred Leasing Costs We capitalize costs directly related to the successful origination of a lease. These costs include leasing commissions paid to third parties for new leases or lease renewals, as well as an allocation of compensation costs, including payroll, bonus and non-cash equity compensation of employees who spend time on lease origination activities. In determining the amount of compensation costs to be capitalized for these employees, allocations are made based on estimates of the actual amount of time spent working on successful leases in comparison to time spent on unsuccessful origination efforts.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets In accordance with the provisions of the Impairment or Disposal of Long-Lived Assets Subsections of ASC Topic 360: Property, Plant, and Equipment, we assess the carrying values of our respective long-lived assets, including goodwill, whenever events or changes in circumstances indicate that the carrying amounts of these assets may not be fully recoverable. Recoverability of real estate assets is measured by comparison of the carrying amount of the asset to the estimated future undiscounted cash flows. In order to review real estate assets for recoverability, we consider current market conditions as well as our intent with respect to holding or disposing of the asset. The intent with regards to the underlying assets might change as market conditions and other factors change. Fair value is determined through various valuation techniques; including discounted cash flow models, applying a capitalization rate to estimated net operating income of a property, quoted market values and third-party appraisals, where considered necessary. The use of projected future cash flows is based on assumptions that are consistent with estimates of future expectations and the strategic plan used to manage our underlying business. If our analysis indicates that the carrying value of the real estate asset is not recoverable on an undiscounted cash flow basis, we will recognize an impairment charge for the amount by which the carrying value exceeds the current estimated fair value of the real estate property. Assumptions and estimates used in the recoverability analyses for future cash flows, discount rates and capitalization rates are complex and subjective. Changes in economic and operating conditions or our intent with respect to our investment that occur subsequent to our impairment analyses could impact these assumptions and result in future impairment of our real estate properties.
Investment in Unconsolidated Real Estate Entities	Investment in Unconsolidated Real Estate Entities Investment in unconsolidated real estate entities in which we have the ability to exercise significant influence (but not control) are accounted for under the equity method of investment. Under the equity method, we initially record our investment at cost, and subsequently adjust for equity in earnings or losses and cash contributions and distributions. Any difference between the carrying amount of these investments on the balance sheet and the underlying equity in net assets is amortized as an adjustment to equity in income (loss) from unconsolidated real estate entities over the life of the related asset. Under the equity method of accounting, our net equity investment is reflected within the consolidated balance sheets, and our share of net income or loss from the joint venture is included within the consolidated statements of operations. Furthermore, distributions received from equity method investments are classified as either operating cash inflows or investing cash inflows in the consolidated statements of cash flows using the “nature of the distribution approach,” in which each distribution is evaluated on the basis of the source of the payment.
Income Taxes	Income Taxes We have elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (the “Code”) commencing with our initial taxable year ended December 31, 2013. To qualify as a REIT, we are required (among other things) to distribute at least 90% of our REIT taxable income to our stockholders and meet the various other requirements imposed by the Code relating to matters such as operating results, asset holdings, distribution levels and diversity of stock ownership. Provided we qualify for taxation as a REIT, we are generally not subject to corporate-level income tax on the earnings distributed currently to our stockholders. If we fail to qualify as a REIT in any taxable year, and were unable to avail ourselves of certain savings provisions set forth in the Code, all of our taxable income would be subject to federal income tax at regular corporate rates, including any applicable alternative minimum tax. In addition, we are subject to taxation by various state and local jurisdictions, including those in which we transact business or reside. Our non-taxable REIT subsidiaries, including our Operating Partnership, are either partnerships or disregarded entities for federal income tax purposes. Under applicable federal and state income tax rules, the allocated share of net income or loss from disregarded entities and flow-through entities such as partnerships is reportable in the income tax returns of the respective equity holders. Accordingly, no income tax provision is included in the accompanying consolidated financial statements for the nine months ended September 30, 2018 and 2017 . We periodically evaluate our tax positions to determine whether it is more likely than not that such positions would be sustained upon examination by a tax authority for all open tax years, as defined by the statute of limitations, based on their technical merits. As of September 30, 2018 , and December 31, 2017 , we have not established a liability for uncertain tax positions.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities FASB ASC Topic 815: Derivatives and Hedging (“ASC 815”), provides the disclosure requirements for derivatives and hedging activities with the intent to provide users of financial statements with an enhanced understanding of: (a) how and why an entity uses derivative instruments, (b) how the entity accounts for derivative instruments and related hedged items, and (c) how derivative instruments and related hedged items affect an entity’s financial position, financial performance, and cash flows. Further, qualitative disclosures are required that explain the Company’s objectives and strategies for using derivatives, as well as quantitative disclosures about the fair value of and gains and losses on derivative instruments, and disclosures about credit-risk-related contingent features in derivative instruments. As required by ASC 815, we record all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, and whether we have elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. We may enter into derivative contracts that are intended to economically hedge certain risks, even though hedge accounting does not apply or we elect not to apply hedge accounting. See Note 7.
Revenue Recognition	Revenue Recognition Our primary sources of revenue are rental income, tenant reimbursements, other income, management, leasing and development services and gains on sale of real estate. Rental Income Minimum annual rental revenues are recognized in rental income on a straight-line basis over the term of the related lease, regardless of when payments are contractually due. Rental revenue recognition commences when the tenant takes possession or controls the physical use of the leased space. Lease termination fees, which are included in rental income, are recognized when the related lease is canceled and we have no continuing obligation to provide services to such former tenant. Tenant Reimbursements Our lease agreements with tenants generally contain provisions that require tenants to reimburse us for certain property expenses. Estimated reimbursements from tenants for real estate taxes, common area maintenance and other recoverable operating expenses are recognized as revenues in the period that the expenses are incurred. Subsequent to year-end, we perform final reconciliations on a lease-by-lease basis and bill or credit each tenant for any cumulative annual adjustments. Other Income Other income primarily consists of late payment fees and other miscellaneous tenant related revenues. Management, leasing and development services We provide property management services and leasing services to related party and third-party property owners, the customer, in exchange for fees and commissions. Property management services include performing property inspections, monitoring repairs and maintenance, negotiating vendor contracts, maintaining tenant relations and providing financial and accounting oversight. For these services, we earn monthly management fees, which are based on a fixed percentage of each managed property’s monthly tenant cash receipts. We have determined that control over the services is passed to the customer simultaneously as performance occurs. Accordingly, management fee revenue is earned as the services are provided to our customers. Leasing commissions are earned when we provide leasing services that result in an executed lease with a tenant. We have determined that control over the services is transferred to the customer upon execution of each lease agreement. We earn leasing commissions based on a fixed percentage of rental income generated for each executed lease agreement and there is no variable income component. Gain or Loss on Sale of Real Estate We account for dispositions of real estate properties, which are considered nonfinancial assets, in accordance with ASC 610-20: Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets and recognize a gain or loss on sale of real estate upon transferring control of the nonfinancial asset to the purchaser, which is generally satisfied at the time of sale. If we were to conduct a partial sale of real estate by transferring a controlling interest in a nonfinancial asset, while retaining a noncontrolling ownership interest, we would measure any noncontrolling interest received or retained at fair value, and recognize a full gain or loss. If we receive consideration before transferring control of a nonfinancial asset, we recognize a contract liability. If we transfer control of the asset before consideration is received, we recognize a contract asset.
Valuation of Receivables	Valuation of Receivables We may be subject to tenant defaults and bankruptcies that could affect the collection of outstanding receivables. In order to mitigate these risks, we perform credit reviews and analyses on prospective tenants before significant leases are executed and on existing tenants before properties are acquired. We specifically analyze aged receivables, customer credit-worthiness, historical bad debts and current economic trends when evaluating the adequacy of the allowance for doubtful accounts. As a result of our periodic analysis, we maintain an allowance for estimated losses that may result from the inability of our tenants to make required payments. This estimate requires significant judgment related to the lessees’ ability to fulfill their obligations under the leases. We believe our allowance for doubtful accounts is adequate for our outstanding receivables for the periods presented. If a tenant is insolvent or files for bankruptcy protection and fails to make contractual payments beyond any allowance, we may recognize additional bad debt expense in future periods equal to the net outstanding balances, which include amounts recognized as straight-line revenue not realizable until future periods.
Equity Based Compensation	Equity Based Compensation We account for equity based compensation in accordance with ASC Topic 718 Compensation - Stock Compensation . Total compensation cost for all share-based awards is based on the estimated fair market value on the grant date. For share-based awards that vest based solely on a service condition, we recognize compensation cost on a straight-line basis over the total requisite service period for the entire award. For share-based awards that vest based on a market or performance condition, we recognize compensation cost on a straight-line basis over the requisite service period of each separately vesting tranche. Forfeitures are recognized in the period in which they occur. See Note 12.
Equity Offering Costs	Equity Offering Costs Underwriting commissions and offering costs related to our common stock issuances have been reflected as a reduction of additional paid-in capital. Underwriting commissions and offering costs related to our preferred stock issuances have been reflected as a direct reduction of the preferred stock balance.
Earnings Per Share	Earnings Per Share We calculate earnings per share (“EPS”) in accordance with ASC 260 - Earnings Per Share (“ASC 260”). Under ASC 260, nonvested share-based payment awards that contain non-forfeitable rights to dividends are participating securities and, therefore, are included in the computation of basic EPS pursuant to the two-class method. The two-class method determines EPS for each class of common stock and participating securities according to dividends declared (or accumulated) and their respective participation rights in undistributed earnings. Basic EPS is calculated by dividing the net income (loss) attributable to common stockholders by the weighted average number of shares of common stock outstanding for the period. Diluted EPS is calculated by dividing the net income (loss) attributable to common stockholders by the weighted average number of shares of common stock outstanding determined for the basic EPS computation plus the effect of any dilutive securities. We include unvested shares of restricted stock and unvested LTIP units in the computation of diluted EPS by using the more dilutive of the two-class method or treasury stock method. We include unvested performance units as contingently issuable shares in the computation of diluted EPS once the market criteria are met, assuming that the end of the reporting period is the end of the contingency period. Any anti-dilutive securities are excluded from the diluted EPS calculation. See Note 13.
Segment Reporting	Segment Reporting Management views the Company as a single reportable segment based on its method of internal reporting in addition to its allocation of capital and resources.
Adoption of New Accounting Pronouncements and Recently Issued Accounting Pronouncements	Adoption of New Accounting Pronouncements Revenue Recognition On May 28, 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), and subsequently issued additional ASUs which provide practical expedients, technical corrections and clarification of the new standard (collectively “ASC 606”). ASC 606 establishes principles for reporting the nature, amount, timing and uncertainty of revenues and cash flows arising from an entity’s contracts with customers. The core principle of the new standard is that an entity recognizes revenue to represent the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Effective January 1, 2018, we adopted ASC 606 using the modified retrospective approach. We evaluated each of our revenue streams to determine the sources of revenue that are impacted by ASC 606 and concluded that management services and leasing services fall within the scope of ASC 606. We evaluated the impact of ASC 606 on the timing and pattern of revenue recognition for our management and leasing services contracts and determined there was no change in the timing or pattern of revenue recognition for these contracts as compared to prior accounting practice. Accordingly, the adoption of ASC 606 did not have an impact on our consolidated financial statements. See “Revenue Recognition” above for further details. Derecognition of Non-Financial Assets On February 22, 2017, the FASB issued ASU 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets (“ASU 2017-05). ASU 2017-05 clarifies the scope of asset derecognition and adds further guidance for recognizing gains and losses from the transfer of nonfinancial assets in contracts with non-customers. Effective January 1, 2018, we adopted ASU 2017-05 using the modified retrospective approach. There was no cumulative effect adjustment recorded to retained earnings as of January 1, 2018 as a result of the adoption of ASU 2017-05. Derivatives On August 28, 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”). ASU 2017-12 simplifies hedge accounting by eliminating the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. For cash flow hedges, ASU 2017-12 requires all changes in the fair value of the hedging instrument to be deferred in other comprehensive income and recognized in earnings at the same time that the hedged item affects earnings. ASU 2017-12 also eases certain documentation and assessment requirements and modifies the accounting for components excluded from the assessment of hedge effectiveness. ASU 2017-12 is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted. Effective January 1, 2018, we early adopted ASU 2017-12 using the modified retrospective approach. We did not record a cumulative effect adjustment to eliminate ineffectiveness amounts as we did not have any ineffectiveness in our historical consolidated financial statements. In addition, certain provisions of ASU 2017-12 require modifications to existing presentation and disclosure requirements on a prospective basis. See Note 7 for disclosures relating to our derivative instruments. Stock Compensation On May 10, 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting (“ASU 2017-09”), which clarifies the scope of modification accounting for share-based compensation arrangements by providing guidance on the types of changes to the terms and conditions of share-based compensation awards to which an entity would be required to apply modification accounting under ASC 718. ASU 2017-09 is effective for annual periods beginning after December 15, 2017, with early adoption permitted. Effective January 1, 2018, we early adopted ASU 2017-09. There was no change to our consolidated financial statements or notes to our consolidated financial statements as a result of the adoption of ASU 2017-09. Recently Issued Accounting Pronouncements Changes to GAAP are established by the FASB in the form of ASUs to the FASB’s Accounting Standards Codification. We consider the applicability and impact of all ASUs. Leases On February 25, 2016, the FASB issued ASU 2016-02, Leases (“ASC 842”), which sets out the principals for the recognition, measurement, presentation and disclosure of leases for both lessees and lessors. ASC 842 requires lessees to recognize the following for all leases (with the exception of short-term leases) at the commencement date: (1) a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and (2) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. ASC 842 also requires lessees to classify leases as either finance or operating leases based on whether or not the lease is effectively a financed purchase of the leased asset by the lessee. This classification is used to evaluate whether the lease expense should be recognized based on an effective interest method or on a straight-line basis over the term of the lease. As of September 30, 2018 , we are the lessee on one ground lease and multiple office space leases. Upon the adoption of ASC 842, we will be required to record a lease liability and a right-of-use asset for these leases on our consolidated balance sheets. See Note 10 for a summary of rent expense and remaining contractual payments under our ground lease and office space leases. ASC 842 requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases, and operating leases. ASC 842 specifies that payments for certain lease-related services (for example, maintenance services, including common area maintenance), which are often included in lease agreements, represent “non-lease” components that will become subject to the guidance in ASC 606 when ASC 842 becomes effective. In July 2018, the FASB issued ASU 2018-11, Leases: Targeted Improvements (“ASU 2018-11”), which provides lessors with an optional practical expedient to not separate lease and non-lease components if both of the following criteria are met: (1) the timing and pattern of transfer of the lease and non-lease component(s) are the same and (2) the lease component would be classified as an operating lease, if it were accounted for separately. We anticipate the majority of our leases will qualify for the practical expedient and as such, we plan to adopt the practical expedient. Additionally, ASC 842 requires lessors to capitalize, as initial direct costs, only those costs that are incurred due to the execution of a lease. As a result, compensation costs related to employees who spend time on lease origination activities, regardless of whether their time leads to a successful lease, will no longer be capitalized as initial direct costs and instead will be expensed as incurred. See “Deferred Leasing Costs” above for a summary of employee related compensation costs capitalized during the three and nine months ended September 30, 2018 and 2017 . ASC 842 is effective for annual periods beginning after December 15, 2018, which for us is January 1, 2019, and early adoption is permitted. ASC 842 requires the use of a modified retrospective transition approach for all leases existing at, or entered into after, the beginning of the earliest period presented in the consolidated financial statements, with certain practical expedients available. ASU 2018-11 provides for an optional transition method (the “effective date method”) which would allow an entity to apply the transition provisions as of the effective date by recognizing its cumulative adjustment to the opening balance sheet of retained earnings in the period of adoption rather than in the earliest comparative period presented. In this case, an entity would continue to apply the legacy guidance in current GAAP (ASC 840), including its disclosure requirements, in the comparative periods presented in the financial statements. We plan to adopt ASC 842 using the effective date method and are currently completing our assessment of the impact of the guidance on our consolidated financial statements and notes to our consolidated financial statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Schedule of Cash and Cash Equivalents and Restricted Cash	The following table provides a reconciliation of our cash and cash equivalents and restricted cash as of September 30, 2018 and December 31, 2017 (in thousands): September 30, 2018 December 31, 2017 Cash and cash equivalents $ 183,904 $ 6,620 Restricted cash — 250 Cash, cash equivalents and restricted cash $ 183,904 $ 6,870
Schedule of Accounts, Notes, Loans and Financing Receivable	Rents and other receivables, net and deferred rent receivable, net consisted of the following as of September 30, 2018 and December 31, 2017 (in thousands): September 30, 2018 December 31, 2017 Rents and other receivables $ 6,882 $ 5,369 Allowance for doubtful accounts (1,840 ) (1,705 ) Rents and other receivables, net $ 5,042 $ 3,664 Deferred rent receivable $ 20,877 $ 15,912 Allowance for doubtful accounts (107 ) (86 ) Deferred rent receivable, net $ 20,770 $ 15,826 We recorded the following provision for doubtful accounts, including amounts related to deferred rents, as a reduction to rental revenues in our consolidated statements of operations for the three and nine months ended September 30, 2018 and 2017 (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Provision for doubtful accounts $ 481 $ 231 $ 824 $ 897

Investments in Real Estate (Tab

Investments in Real Estate (Tables)	9 Months Ended
	Sep. 30, 2018
Investments, All Other Investments [Abstract]
Summary of Acquired Wholly Owned Property Acquisitions	The following table summarizes the wholly-owned industrial properties we acquired during the nine months ended September 30, 2018 : Property Submarket Date of Acquisition Rentable Square Feet Number of Buildings Contractual Purchase Price (1) (in thousands) 13971 Norton Avenue (2) Inland Empire - West 1/17/2018 103,208 1 $ 11,364 Ontario Airport Commerce Center (3) Inland Empire - West 2/23/2018 213,603 3 24,122 16010 Shoemaker Avenue (4) Los Angeles - Mid-Counties 3/13/2018 115,600 1 17,218 4039 Calle Platino (5) Oceanside 4/4/2018 143,274 1 20,000 851 Lawrence Drive (6) Thousand Oaks 4/5/2018 49,976 1 6,600 1581 North Main Street (6) Orange 4/6/2018 39,661 1 7,150 1580 West Carson Street (7) Long Beach 4/26/2018 43,787 1 7,500 660 & 664 North Twin Oaks Valley Road (6) San Marcos 4/26/2018 96,993 2 14,000 1190 Stanford Court (6) North Orange County 5/8/2018 34,494 1 6,080 5300 Sheila Street (6) Central LA 5/9/2018 695,120 1 121,000 15777 Gateway Circle (4) OC Airport 5/17/2018 37,592 1 8,050 1998 Surveyor Avenue (4)(8) Ventura 5/18/2018 — (8) — (8) 5,821 3100 Fujita Street (4) South Bay 5/31/2018 91,516 1 14,037 4416 Azusa Canyon Road (4) San Gabriel Valley 6/8/2018 70,510 1 12,000 1420 Mckinley Avenue (4) South Bay 6/12/2018 136,685 1 30,000 12154 Montague Street (4) Greater San Fernando Valley 6/29/2018 122,868 1 22,525 10747 Norwalk Boulevard (4) Los Angeles - Mid-Counties 7/18/2018 52,691 1 10,835 29003 Avenue Sherman (4) Greater San Fernando Valley 7/19/2018 68,123 1 9,500 16121 Carmenita Road (4) Los Angeles - Mid-Counties 8/14/2018 108,500 1 13,300 Total 2018 Wholly-Owned Property Acquisitions 2,224,201 21 $ 361,102 (1) Represents the gross contractual purchase price before prorations, closing costs and other acquisition related costs. (2) This acquisition was partially funded through a 1031 Exchange using $10.7 million of net cash proceeds from the sale of our property located at 8900-8980 Benson Avenue and 5637 Arrow Highway and borrowings under our unsecured revolving credit facility. (3) The Ontario Airport Commerce Center is an industrial park which includes two properties located at 1900 Proforma Avenue and 1910-1920 Archibald Avenue. This acquisition was partially funded through a 1031 Exchange using $10.3 million of net cash proceeds from the sale of our property located at 700 Allen Avenue and 1851 Flower Street, borrowings under our unsecured revolving credit facility and available cash on hand. On May 9, 2018, we sold the property located at 1910-1920 Archibald Avenue (see Note 11). (4) This acquisition was funded with available cash on hand. (5) This acquisition was partially funded through a 1031 Exchange using $4.2 million of net cash proceeds from the sale of our property located at 200-220 South Grand Avenue and borrowings under our unsecured revolving credit facility. (6) This acquisition was funded with available cash on hand and borrowings under our unsecured revolving credit facility. (7) This acquisition was partially funded through a 1031 Exchange using $1.6 million of net cash proceeds from the sale of our property located at 6770 Central Avenue—Building B and borrowings under our unsecured revolving credit facility. (8) We acquired 1998 Surveyor Avenue as an under-construction building for a cost of $5.8 million and the assumption of the seller’s fixed-price construction contracts with approximately $4.4 million of remaining costs. At completion, the property will be one single-tenant building containing 56,306 rentable square feet.
Summary of Fair Value of Amounts Recognized	The following table summarizes the fair value of amounts allocated to each major class of asset and liability for the acquisitions noted in the table above, as of the date of each acquisition (in thousands): 2018 Acquisitions Assets: Land $ 229,331 Buildings and improvements 154,096 Tenant improvements 1,533 Acquired lease intangible assets (1) 19,406 Other acquired assets (2) 103 Total assets acquired 404,469 Liabilities: Acquired lease intangible liabilities (3) 39,467 Other assumed liabilities (2) 1,460 Total liabilities assumed 40,927 Net assets acquired $ 363,542 (1) Acquired lease intangible assets is comprised of $19.3 million of in-place lease intangibles with a weighted average amortization period of 18.3 years and $0.1 million of above-market lease intangibles with a weighted average amortization period of 3.7 years. (2) Includes other working capital assets acquired and liabilities assumed, at the time of acquisition. (3) Represents below-market lease intangibles with a weighted average amortization period of 27.6 years.

Intangible Assets (Tables)

Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Acquired Lease Intangible Assets and Liabilities	The following table summarizes our acquired lease intangible assets, including the value of in-place leases and above-market tenant leases, and our acquired lease intangible liabilities, including below-market tenant leases and above-market ground leases (in thousands): September 30, 2018 December 31, 2017 Acquired Lease Intangible Assets: In-place lease intangibles $ 113,505 $ 95,750 Accumulated amortization (64,556 ) (51,735 ) In-place lease intangibles, net $ 48,949 $ 44,015 Above-market tenant leases $ 10,704 $ 10,718 Accumulated amortization (6,251 ) (5,494 ) Above-market tenant leases, net $ 4,453 $ 5,224 Acquired lease intangible assets, net $ 53,402 $ 49,239 Acquired Lease Intangible Liabilities: Below-market tenant leases $ (64,078 ) $ (24,843 ) Accumulated accretion 11,914 6,925 Below-market tenant leases, net $ (52,164 ) $ (17,918 ) Above-market ground lease $ (290 ) $ (290 ) Accumulated accretion 165 141 Above-market ground lease, net $ (125 ) $ (149 ) Acquired lease intangible liabilities, net $ (52,289 ) $ (18,067 )
Summary of Amortization or Accretion Recorded During the Period Related to Acquired Lease Intangibles	The following table summarizes the amortization related to our acquired lease intangible assets and liabilities for the reported periods noted below (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 In-place lease intangibles (1) $ 4,115 $ 4,708 $ 13,982 $ 10,812 Net below-market tenant leases (2) $ (1,615 ) $ (877 ) $ (4,330 ) $ (1,179 ) Above-market ground lease (3) $ (8 ) $ (8 ) $ (24 ) $ (24 ) (1) The amortization of in-place lease intangibles is recorded to depreciation and amortization expense in the consolidated statements of operations for the periods presented. (2) The amortization of net below-market tenant leases is recorded as an increase to rental revenues in the consolidated statements of operations for the periods presented. (3) The accretion of the above-market ground lease is recorded as a decrease to property expenses in the consolidated statements of operations for the periods presented.

Notes Payable (Tables)

Notes Payable (Tables)	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Summary of Components and Significant Terms of Our Indebtedness	The following table summarizes the components and significant terms of our indebtedness as of September 30, 2018 , and December 31, 2017 (dollars in thousands): September 30, 2018 December 31, 2017 Principal Amount Unamortized Discount and Debt Issuance Costs Principal Amount Unamortized Discount and Debt Issuance Costs Contractual Maturity Date Stated Interest Rate (1) Effective Interest Rate (2) Secured Debt $60M Term Loan (3) $ 58,499 $ (242 ) $ 58,891 $ (125 ) 8/1/2023 (4) LIBOR+1.70% 3.70 % Gilbert/La Palma (5) 2,655 (131 ) 2,767 (138 ) 3/1/2031 5.125 % 5.44 % Unsecured Debt $100M Term Loan Facility 100,000 (280 ) 100,000 (343 ) 2/14/2022 LIBOR+1.20% (6) 3.18 % (7) Revolving Credit Facility — — 60,000 — 2/12/2021 (8) LIBOR+1.10% (6)(9) 3.36 % $225M Term Loan Facility 225,000 (1,569 ) 225,000 (1,398 ) 1/14/2023 LIBOR+1.20% (6) 2.74 % (10) $150M Term Loan Facility 150,000 (1,069 ) — — 5/22/2025 LIBOR+1.50% (6) 3.87 % $100M Notes 100,000 (519 ) 100,000 (576 ) 8/6/2025 4.290 % 4.37 % $125M Notes 125,000 (126 ) 125,000 (137 ) 7/13/2027 3.930 % 3.94 % Total $ 761,154 $ (3,936 ) $ 671,658 $ (2,717 ) (1) Reflects the contractual interest rate under the terms of the loan, as of September 30, 2018 . (2) Reflects the effective interest rate as of September 30, 2018 , which includes the effect of the amortization of discounts and debt issuance costs and the effect of interest rate swaps that are effective as of September 30, 2018 . (3) This term loan was modified on June 27, 2018, as further described below under “Modification of $60 Million Term Loan”. This term loan is secured by six properties. As of September 30, 2018 , the interest rate on this variable-rate term loan has been effectively fixed through the use of two interest rate swaps. See Note 7 for details. (4) One 24 -month extension available at the borrower’s option. (5) Monthly payments of interest and principal are based on a 20 -year amortization table. (6) The LIBOR margin will range from 1.20% to 1.70% per annum for the $100.0 million term loan facility, 1.10% to 1.50% per annum for the unsecured revolving credit facility, 1.20% to 1.70% per annum for the $225.0 million term loan facility and 1.50% to 2.20% per annum for the $150.0 million term loan facility, depending on the ratio of our outstanding consolidated indebtedness to the value of our consolidated gross asset value, or leverage ratio, which is measured on a quarterly basis. (7) As of September 30, 2018 , interest on the $100.0 million term loan facility has been effectively fixed through the use of two interest rate swaps. See Note 7 for details. (8) Two additional six -month extensions are available at the borrower’s option. (9) The unsecured revolving credit facility is subject to an applicable facility fee which is calculated as a percentage of the total lenders’ commitment amount, regardless of usage. The applicable facility fee will range from 0.15% to 0.30% per annum depending upon our leverage ratio. (10) As of September 30, 2018 , interest on the $225.0 million term loan facility has been effectively fixed through the use of two interest rate swaps. See Note 7 for details. The following table summarizes the balance of our indebtedness as of September 30, 2018 and December 31, 2017 (in thousands): September 30, 2018 December 31, 2017 Principal amount $ 761,154 $ 671,658 Less: unamortized discount and debt issuance costs (1) (3,936 ) (2,717 ) Carrying value $ 757,218 $ 668,941 (1) Excludes unamortized debt issuance costs related to our unsecured revolving credit facility, which are presented in the line item “Deferred loan costs, net” in the consolidated balance sheets.
Summary of Aggregate Future Minimum Payments of Debt	The following table summarizes the contractual debt maturities and scheduled amortization payments, excluding debt discounts and debt issuance costs, as of September 30, 2018 , and does not consider extension options available to us as noted in the table above (in thousands): October 1, 2018 - December 31, 2018 $ 38 2019 158 2020 166 2021 566 2022 100,967 Thereafter 659,259 Total $ 761,154

Operating Leases (Tables)

Operating Leases (Tables)	9 Months Ended
	Sep. 30, 2018
Leases, Operating [Abstract]
Future Minimum Base Rent Under Non-cancelable Operating Leases	Future minimum base rent under operating leases as of September 30, 2018 , is summarized as follows (in thousands): Twelve months ended September 30: 2019 $ 168,276 2020 145,541 2021 111,805 2022 77,779 2023 58,081 Thereafter 210,050 Total $ 771,532

Interest Rate Swaps (Tables)

Interest Rate Swaps (Tables)	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Interest Rate Swap Agreement	The following table sets forth a summary of our interest rate swaps at September 30, 2018 and December 31, 2017 (dollars in thousands): Current Notional Value (1) Fair Value of Interest Rate Derivative Assets /(Derivative Liabilities) (2) Derivative Instrument Effective Date Maturity Date LIBOR Interest Strike Rate September 30, 2018 December 31, 2017 September 30, 2018 December 31, 2017 Interest Rate Swap 1/15/2015 2/15/2019 1.826 % $ 30,000 $ 30,000 $ 61 $ (11 ) Interest Rate Swap 7/15/2015 2/15/2019 2.010 % $ 28,304 $ 28,891 $ 37 $ (70 ) Interest Rate Swap 8/14/2015 12/14/2018 1.790 % $ 50,000 $ 50,000 $ 49 $ (18 ) Interest Rate Swap 2/16/2016 12/14/2018 2.005 % $ 50,000 $ 50,000 $ 27 $ (120 ) Interest Rate Swap 2/14/2018 1/14/2022 1.349 % $ 125,000 $ — $ 6,037 $ 3,582 Interest Rate Swap 8/14/2018 1/14/2022 1.406 % $ 100,000 $ — $ 4,673 $ 2,521 Interest Rate Swap 12/14/2018 8/14/2021 1.764 % $ — $ — $ 2,967 $ 1,090 (1) Represents the notional value of swaps that are effective as of the balance sheet date presented. (2) The fair value of derivative assets are included in the line item “Interest rate swap asset” in the accompanying consolidated balance sheets and the fair value of (derivative liabilities) are included in the line item “Interest rate swap liability” in the accompanying consolidated balance sheets.
Summary of Impact of Interest Rate Swaps on Consolidated Financial Statements	The following table sets forth the impact of our interest rate swaps on our consolidated statements of operations for the periods presented (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Interest Rate Swaps in Cash Flow Hedging Relationships: Amount of gain (loss) recognized in AOCI on derivatives $ 1,212 $ 382 $ 7,382 $ (672 ) Amount of gain (loss) reclassified from AOCI into earnings under “Interest expense” $ 397 $ (280 ) $ 505 $ (1,090 ) Total interest expense presented in the Consolidated Statement of Operations in which the effects of cash flow hedges are recorded (line item “Interest expense”) $ 6,456 $ 6,271 $ 18,760 $ 14,571
Offsetting Assets	The following tables present information about the potential effects of netting if we were to offset our interest rate swap assets and interest rate swap liabilities in the accompanying consolidated balance sheets as of September 30, 2018 and December 31, 2017 (in thousands). Gross Amounts Not Offset in the Balance Sheet Offsetting of Derivative Assets Gross Amounts of Recognized Assets Gross Amounts Offset in the Balance Sheet Net Amounts of Assets Presented in the Balance Sheet Financial Instruments Cash Collateral Received Net Amount September 30, 2018 Interest rate swaps 13,851 — 13,851 — — 13,851 December 31, 2017 Interest rate swaps 7,193 — 7,193 (219 ) — 6,974
Offsetting Liabilities	Gross Amounts Not Offset in the Balance Sheet Offsetting of Derivative Liabilities Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Balance Sheet Net Amounts of Assets Presented in the Balance Sheet Financial Instruments Cash Collateral Received Net Amount September 30, 2018 Interest rate swaps — — — — — — December 31, 2017 Interest rate swaps 219 — 219 (219 ) — —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Assets Measures at Fair Vale on a Recurring Basis by Level within Fair Value Hierarchy	The table below sets forth the estimated fair value of our interest rate swaps as of September 30, 2018 and December 31, 2017 , which we measure on a recurring basis by level within the fair value hierarchy (in thousands). Fair Value Measurement Using Total Fair Value Quoted Price in Active Markets for Identical Assets and Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) September 30, 2018 Interest Rate Swap Asset $ 13,851 $ — $ 13,851 $ — Interest Rate Swap Liability $ — $ — $ — $ — December 31, 2017 Interest Rate Swap Asset $ 7,193 $ — $ 7,193 $ — Interest Rate Swap Liability $ (219 ) $ — $ (219 ) $ —
Carrying Value and Estimated Fair Value of Notes Payable	The table below sets forth the carrying value and the estimated fair value of our notes payable as of September 30, 2018 and December 31, 2017 (in thousands): Fair Value Measurement Using Liabilities Total Fair Value Quoted Price in Active Markets for Identical Assets and Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Carrying Value Notes Payable at: September 30, 2018 $ 752,722 $ — $ — $ 752,722 $ 757,218 December 31, 2017 $ 673,377 $ — $ — $ 673,377 $ 668,941

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Commitment Under Ground Lease and Corporate Office Lease	The future minimum commitment under our ground lease and office space leases as of September 30, 2018 , is as follows (in thousands): Office Leases Ground Lease October 1, 2018 - December 31, 2018 $ 223 $ 36 2019 660 144 2020 257 144 2021 167 144 2022 — 144 Thereafter — 5,676 Total $ 1,307 $ 6,288

Dispositions and Real Estate _2

Dispositions and Real Estate Held For Sale (Tables)	9 Months Ended
	Sep. 30, 2018
Discontinued Operations and Disposal Groups [Abstract]
Summary of Disposed Properties	The following table summarizes the properties we sold during the nine months ended September 30, 2018 : Property Submarket Date of Disposition Rentable Square Feet Contractual Sales Price (1) (in thousands) Gain Recorded (in thousands) 8900-8980 Benson Avenue and 5637 Arrow Highway Inland Empire West 1/2/2018 88,016 $ 11,440 $ 4,029 700 Allen Avenue and 1851 Flower Street Los Angeles - San Fernando Valley 1/17/2018 25,168 $ 10,900 $ 4,753 200-220 South Grand Avenue Orange County - Airport 3/7/2018 27,200 $ 4,515 $ 1,201 6770 Central Avenue—Building B Inland Empire West 4/9/2018 11,808 $ 1,676 $ 1,113 1910-1920 Archibald Avenue Inland Empire West 5/9/2018 78,243 $ 9,050 $ 495 Total 230,435 $ 37,581 $ 11,591 (1) Represents the gross contractual sales price before commissions, prorations and other closing costs.
Disclosure of Long Lived Assets Held-for-sale [Table Text Block]	The following table summarizes the major classes of assets and liabilities associated with real estate properties classified as held for sale (in thousands): December 31, 2017 Land $ 5,671 Buildings and improvements 7,180 Tenant improvements 429 Construction in progress 16 Real estate held for sale 13,296 Accumulated depreciation (1,609 ) Real estate held for sale, net 11,687 Acquired lease intangible assets, net 71 Other assets associated with real estate held for sale 678 Total assets associated with real estate held for sale, net $ 12,436 Tenant security deposits $ 193 Other liabilities associated with real estate held for sale 50 Total liabilities associated with real estate held for sale $ 243

Equity (Tables)

Equity (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Schedule of Unvested Restricted Stock Activity	The following table sets forth our share-based award activity for the nine months ended September 30, 2018 : Unvested Awards Restricted Common Stock LTIP Units Performance Units Balance at January 1, 2018 190,695 293,485 703,248 Granted 103,443 57,443 — Forfeited (13,031 ) — — Vested (1) (71,893 ) (45,034 ) — Balance at September 30, 2018 209,214 305,894 703,248 (1) During the nine months ended September 30, 2018 , 20,663 shares of the Company’s common stock were tendered in accordance with the terms of the Plan to satisfy minimum statutory tax withholding requirements associated with the vesting of restricted shares of common stock.
Vesting Schedule of the Unvested Shares of Restricted Stock Outstanding	The following table sets forth the vesting schedule of all unvested share-based awards outstanding as of September 30, 2018 : Unvested Awards Restricted LTIP Units Performance Units (1) October 1, 2018 - December 31, 2018 9,933 111,721 315,998 2019 82,678 114,818 199,000 2020 55,622 73,151 188,250 2021 39,409 3,102 — 2022 21,572 3,102 — Total 209,214 305,894 703,248 (1) Represents the maximum number of Performance Units that would become earned and vested on December 14, 2018, December 28, 2019 and December 14, 2020, in the event that the specified maximum total shareholder return (“TSR”) goals are achieved over the three-year performance period from December 15, 2015 through December 14, 2018, the three-year performance period from December 29, 2016 through December 28, 2019, and the three-year performance period from December 15, 2017 through December 14, 2020, respectively. The number of Performance Units that ultimately vest will be based on both the Company’s absolute TSR and the Company’s TSR performance relative to a peer group over each three-year performance period. The maximum number of Performance Units will be earned only if the Company both (i) achieves 50% or higher absolute TSR, inclusive of all dividends paid, over each three-year performance period with respect to the awards vesting on December 14, 2018 and December 28, 2019, and achieves 36% or higher absolute TSR, inclusive of all dividends paid, over the three-year performance period with respect to the awards vesting on December 14, 2020, and (ii) finishes in the 75 th or greater percentile of the peer group for TSR over each three-year performance period.
Shareholders' Equity and Share-based Payments	The following table sets forth the amounts expensed and capitalized for all share-based awards for the reported periods presented below (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Expensed share-based compensation (1) $ 2,243 $ 1,329 $ 7,866 $ 4,070 Capitalized share-based compensation (2) 73 7 183 120 Total share-based compensation $ 2,316 $ 1,336 $ 8,049 $ 4,190 (1) Amounts expensed are included in “General and administrative” and “Property expenses” in the accompanying consolidated statements of operations. (2) Amounts capitalized, which relate to employees who provide construction and leasing services, are included in “Building and improvements” and “Deferred leasing costs, net” in the consolidated balance sheets.
Summary of the Components of Changes in Accumulated Other Comprehensive Loss	The following table summarizes the changes in our AOCI balance for the nine months ended September 30, 2018 and 2017 , which consists solely of adjustments related to our cash flow hedges (in thousands): Nine Months Ended September 30, 2018 2017 Accumulated other comprehensive income - beginning balance $ 6,799 $ 3,445 Other comprehensive income (loss) before reclassifications 7,382 (672 ) Amounts reclassified from accumulated other comprehensive income to interest expense (505 ) 1,090 Net current period other comprehensive income (loss) 6,877 418 Less other comprehensive (income) loss attributable to noncontrolling interests (118 ) 7 Other comprehensive income (loss) attributable to common stockholders 6,759 425 Accumulated other comprehensive income - ending balance $ 13,558 $ 3,870

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Share	The following table sets forth the computation of basic and diluted earnings per share (in thousands, except share and per share amounts): Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Numerator: Net income $ 8,965 $ 2,009 $ 31,868 $ 27,585 Less: Preferred stock dividends (2,423 ) (1,322 ) (7,270 ) (3,966 ) Less: Net income attributable to noncontrolling interests (141 ) (21 ) (588 ) (684 ) Less: Net income attributable to participating securities (94 ) (80 ) (285 ) (327 ) Net income attributable to common stockholders $ 6,307 $ 586 $ 23,725 $ 22,608 Denominator: Weighted average shares of common stock outstanding – basic 91,463,594 72,621,219 84,407,429 68,984,047 Effect of dilutive securities - performance units 481,612 446,862 518,043 380,808 Weighted average shares of common stock outstanding – diluted 91,945,206 73,068,081 84,925,472 69,364,855 Earnings per share — Basic Net income attributable to common stockholders $ 0.07 $ 0.01 $ 0.28 $ 0.33 Earnings per share — Diluted Net income attributable to common stockholders $ 0.07 $ 0.01 $ 0.28 $ 0.33

Organization (Detail)

Organization (Detail) ft² in Millions	Sep. 30, 2018ft²property
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of real estate properties | property	167
Area of real estate property (square feet) | ft²	20.5
Number of real estate properties additionally managed | property	20
Area of real estate property additionally managed | ft²	1.2

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items]
Restricted cash	$ 0		$ 0		$ 250,000
Cash and cash equivalents	183,904,000		183,904,000		6,620,000
Cash, cash equivalents and restricted cash	183,904,000	$ 12,918,000	183,904,000	$ 12,918,000	6,870,000	$ 15,525,000
Interest capitalized	700,000	400,000	1,585,000	1,311,000
Real estate taxes and insurance costs capitalized	200,000	300,000	$ 700,000	900,000
REIT annual taxable income distribution requirement percentage			90.00%
Income tax provision			$ 0	0
Rents and other receivables	6,882,000		6,882,000		5,369,000
Allowance for doubtful accounts	(1,840,000)		(1,840,000)		(1,705,000)
Rents and other receivables, net	5,042,000		5,042,000		3,664,000
Deferred rent receivable	20,877,000		20,877,000		15,912,000
Allowance for doubtful accounts	(107,000)		(107,000)		(86,000)
Deferred rent receivable, net	20,770,000		20,770,000		15,826,000
Provision for doubtful accounts	481,000	231,000	824,000	897,000
Construction Employees
Summary Of Significant Accounting Policies [Line Items]
Compensation costs capitalized	600,000	500,000	1,600,000	1,300,000
Leasing Employees
Summary Of Significant Accounting Policies [Line Items]
Compensation costs capitalized	$ 300,000	$ 300,000	$ 700,000	$ 800,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Fair value inputs, discount rate			5.50%
Fair value inputs, capitalization rate			4.25%
Estimated average lease-up period			6 months
Minimum | Building
Summary Of Significant Accounting Policies [Line Items]
Estimated remaining life			10 years
Minimum | Site Improvements
Summary Of Significant Accounting Policies [Line Items]
Estimated remaining life			5 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Fair value inputs, discount rate			7.25%
Fair value inputs, capitalization rate			6.25%
Estimated average lease-up period			12 months
Maximum | Building
Summary Of Significant Accounting Policies [Line Items]
Estimated remaining life			30 years
Maximum | Site Improvements
Summary Of Significant Accounting Policies [Line Items]
Estimated remaining life			20 years
700 Allen Avenue
Summary Of Significant Accounting Policies [Line Items]
Restricted cash					$ 250,000

Investments in Real Estate - Su

Investments in Real Estate - Summary of Acquired Wholly Owned Industrial Properties (Detail) $ in Thousands	Apr. 26, 2018USD ($)	Apr. 04, 2018USD ($)	Feb. 23, 2018USD ($)	Jan. 17, 2018USD ($)	Sep. 30, 2018USD ($)ft²building	Sep. 30, 2017USD ($)	May 18, 2018USD ($)
Business Acquisition [Line Items]
Rentable Square Feet | ft²					2,224,201
Number of Buildings | building					21
Purchase price					$ 361,102
Payments to acquire real estate					$ 363,542	$ 532,108
13971 Norton Avenue
Business Acquisition [Line Items]
Date of Acquisition					Jan. 17, 2018
Rentable Square Feet | ft²					103,208
Number of Buildings | building					1
Purchase price					$ 11,364
Ontario Airport Commerce Center
Business Acquisition [Line Items]
Date of Acquisition					Feb. 23, 2018
Rentable Square Feet | ft²					213,603
Number of Buildings | building					3
Purchase price					$ 24,122
1900 Proforma Avenue And 1910-1920 Archibald Avenue
Business Acquisition [Line Items]
Number of Buildings | building					2
16010 Shoemaker Avenue
Business Acquisition [Line Items]
Date of Acquisition					Mar. 13, 2018
Rentable Square Feet | ft²					115,600
Number of Buildings | building					1
Purchase price					$ 17,218
4039 Calle Platino
Business Acquisition [Line Items]
Date of Acquisition					Apr. 4, 2018
Rentable Square Feet | ft²					143,274
Number of Buildings | building					1
Purchase price					$ 20,000
851 Lawrence Drive, Thousand Oaks, California
Business Acquisition [Line Items]
Date of Acquisition					Apr. 5, 2018
Rentable Square Feet | ft²					49,976
Number of Buildings | building					1
Purchase price					$ 6,600
1581 Main Street, Orange County, California
Business Acquisition [Line Items]
Date of Acquisition					Apr. 6, 2018
Rentable Square Feet | ft²					39,661
Number of Buildings | building					1
Purchase price					$ 7,150
1580 Carson Street, Long Beach, California
Business Acquisition [Line Items]
Date of Acquisition					Apr. 26, 2018
Rentable Square Feet | ft²					43,787
Number of Buildings | building					1
Purchase price					$ 7,500
660 & 664 Twin Oaks, San Marcos, California
Business Acquisition [Line Items]
Date of Acquisition					Apr. 26, 2018
Rentable Square Feet | ft²					96,993
Number of Buildings | building					2
Purchase price					$ 14,000
1190 Stanford Court
Business Acquisition [Line Items]
Date of Acquisition					May 8, 2018
Rentable Square Feet | ft²					34,494
Number of Buildings | building					1
Purchase price					$ 6,080
5300 Sheila Street
Business Acquisition [Line Items]
Date of Acquisition					May 9, 2018
Rentable Square Feet | ft²					695,120
Number of Buildings | building					1
Purchase price					$ 121,000
15777 Gateway Circle
Business Acquisition [Line Items]
Date of Acquisition					May 17, 2018
Rentable Square Feet | ft²					37,592
Number of Buildings | building					1
Purchase price					$ 8,050
1998 Surveyor Avenue
Business Acquisition [Line Items]
Date of Acquisition					May 18, 2018
Rentable Square Feet | ft²					0
Number of Buildings | building					0
Purchase price					$ 5,821
Assumed Construction Contract							$ 4,400
3100 Fujita Street
Business Acquisition [Line Items]
Date of Acquisition					May 31, 2018
Rentable Square Feet | ft²					91,516
Number of Buildings | building					1
Purchase price					$ 14,037
4416 Azusa Canyon Road
Business Acquisition [Line Items]
Date of Acquisition					Jun. 8, 2018
Rentable Square Feet | ft²					70,510
Number of Buildings | building					1
Purchase price					$ 12,000
1420 Mckinley Avenue
Business Acquisition [Line Items]
Date of Acquisition					Jun. 12, 2018
Rentable Square Feet | ft²					136,685
Number of Buildings | building					1
Purchase price					$ 30,000
12154 Montague Street
Business Acquisition [Line Items]
Date of Acquisition					Jun. 29, 2018
Rentable Square Feet | ft²					122,868
Number of Buildings | building					1
Purchase price					$ 22,525
10747 Norwalk Boulevard [Member]
Business Acquisition [Line Items]
Date of Acquisition					Jul. 18, 2018
Rentable Square Feet | ft²					52,691
Number of Buildings | building					1
Purchase price					$ 10,835
29003 Avenue Sherman [Member]
Business Acquisition [Line Items]
Date of Acquisition					Jul. 19, 2018
Rentable Square Feet | ft²					68,123
Number of Buildings | building					1
Purchase price					$ 9,500
16121 Carmenita [Member]
Business Acquisition [Line Items]
Date of Acquisition					Aug. 14, 2018
Rentable Square Feet | ft²					108,500
Number of Buildings | building					1
Purchase price					$ 13,300
Like Kind Exchange, Qualified Under IRS Section 1031 | 8900-8980 Benson Avenue and 5637 Arrow Highway
Business Acquisition [Line Items]
Payments to acquire real estate				$ 10,700
Like Kind Exchange, Qualified Under IRS Section 1031 | 700 Allen Avenue and 1851 Flower Street
Business Acquisition [Line Items]
Payments to acquire real estate			$ 10,300
Like Kind Exchange, Qualified Under IRS Section 1031 | 200-220 South Grand Avenue
Business Acquisition [Line Items]
Payments to acquire real estate		$ 4,200
Like Kind Exchange, Qualified Under IRS Section 1031 | 6770 Central Ave, Unit B, Riverside, California
Business Acquisition [Line Items]
Payments to acquire real estate	$ 1,600
Construction in progress | 1998 Surveyor Avenue
Business Acquisition [Line Items]
Rentable Square Feet | ft²					56,306
Number of Buildings | building					1

Investments in Real Estate - _2

Investments in Real Estate - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)
ASSETS
Land	$ 229,331
Buildings and improvements	154,096
Tenant improvements	1,533
Acquired lease intangible assets	19,406
Other acquired assets	103
Total assets acquired	404,469
Liabilities
Acquired lease intangible liabilities	39,467
Other assumed liabilities	1,460
Total liabilities assumed	40,927
Net assets acquired	363,542
Intangible Assets [Abstract]
In-place lease intangibles	19,300
Above-market lease intangibles	$ 100
Weighted average amortization period	27 years 7 months 6 days
In-place lease intangibles
Intangible Assets [Abstract]
Weighted average amortization period	18 years 3 months 19 days
Above Market Leases
Intangible Assets [Abstract]
Weighted average amortization period	3 years 8 months 12 days

Intangible Assets - Summary of

Intangible Assets - Summary of Acquired Lease Intangible Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Acquired Finite Lived Intangible Assets [Line Items]
Acquired lease intangible assets, net	$ 53,402	$ 49,239
Acquired lease intangible liabilities, net	(52,289)	(18,067)
In-place lease intangibles
Acquired Finite Lived Intangible Assets [Line Items]
Acquired lease intangible assets, gross	113,505	95,750
Accumulated amortization	(64,556)	(51,735)
Acquired lease intangible assets, net	48,949	44,015
Above Market Leases
Acquired Finite Lived Intangible Assets [Line Items]
Acquired lease intangible assets, gross	10,704	10,718
Accumulated amortization	(6,251)	(5,494)
Acquired lease intangible assets, net	4,453	5,224
Below Market Tenant Leases
Acquired Finite Lived Intangible Assets [Line Items]
Acquired lease intangible liabilities, gross	(64,078)	(24,843)
Accumulated accretion	11,914	6,925
Acquired lease intangible liabilities, net	(52,164)	(17,918)
Above-market ground lease
Acquired Finite Lived Intangible Assets [Line Items]
Acquired lease intangible liabilities, gross	(290)	(290)
Accumulated accretion	165	141
Acquired lease intangible liabilities, net	$ (125)	$ (149)

Intangible Assets - Summary o_2

Intangible Assets - Summary of Amortization or Accretion Recorded During the Period Related to Acquired Lease Intangibles (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Acquired Finite Lived Intangible Assets [Line Items]
Amortization of (below) above market lease intangibles, net			$ (4,354)	$ (1,203)
In-place lease intangibles
Acquired Finite Lived Intangible Assets [Line Items]
Amortization of in-place lease intangibles	$ 4,115	$ 4,708	13,982	10,812
Net below market tenant leases
Acquired Finite Lived Intangible Assets [Line Items]
Amortization of (below) above market lease intangibles, net	(1,615)	(877)	(4,330)	(1,179)
Above-market ground lease
Acquired Finite Lived Intangible Assets [Line Items]
Accretion of above-market ground lease intangibles	$ (8)	$ (8)	$ (24)	$ (24)

Notes Payable - Summary of Debt

Notes Payable - Summary of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Principal amount	$ 761,154	$ 671,658
Less: unamortized discount and deferred loan costs	(3,936)	(2,717)
Carrying value	$ 757,218	$ 668,941

Notes Payable - Summary of Comp

Notes Payable - Summary of Components and Significant Terms of Our Indebtedness (Detail) $ in Thousands	Jun. 27, 2018USD ($)extension	May 22, 2018USD ($)	Jan. 16, 2018USD ($)	Feb. 14, 2017	Jul. 24, 2013	Sep. 30, 2018USD ($)swap	Sep. 30, 2018USD ($)propertyswapextension	Dec. 31, 2017USD ($)
Debt Instrument [Line Items]
Principal amount						$ 761,154	$ 761,154	$ 671,658
Less: unamortized discount and deferred loan costs						(3,936)	(3,936)	(2,717)
Senior notes
Debt Instrument [Line Items]
Principal amount						100,000	100,000
Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Principal amount						0	0	60,000
Less: unamortized discount and deferred loan costs						$ 0	$ 0	0
Contractual Maturity Date							Feb. 12, 2021
Description of variable rate basis						LIBOR
Basis spread on variable rate						1.10%
Effective Interest Rate						3.36%	3.36%
Number of extensions | extension							2
Extension period							6 months
Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment fee percentage							0.15%
Revolving Credit Facility | Minimum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate							1.10%
Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Commitment fee percentage							0.30%
Revolving Credit Facility | Maximum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate							1.50%
Gilbert/La Palma | Fixed Rate Debt
Debt Instrument [Line Items]
Principal amount						$ 2,655	$ 2,655	2,767
Less: unamortized discount and deferred loan costs						$ (131)	$ (131)	(138)
Contractual Maturity Date							Mar. 1, 2031
Stated Interest Rate						5.125%	5.125%
Effective Interest Rate						5.44%	5.44%
Amortization period							20 years
$60M Term Loan
Debt Instrument [Line Items]
Principal amount	$ 60,000
Number of extensions | extension	1
Extension period	24 months
$60M Term Loan | LIBOR
Debt Instrument [Line Items]
Principal amount						$ 58,499	$ 58,499	58,891
Less: unamortized discount and deferred loan costs						$ (242)	$ (242)	(125)
Contractual Maturity Date							Aug. 1, 2023
Description of variable rate basis						LIBOR
Basis spread on variable rate	1.70%				1.90%	1.70%
Effective Interest Rate						3.70%	3.70%
Number of extensions | extension							1
Extension period							24 months
$60M Term Loan | Fixed Rate Debt | LIBOR
Debt Instrument [Line Items]
Number of properties securing loan | property							6
Number of derivative instruments | swap						2	2
$100M Term Loan Facility | LIBOR
Debt Instrument [Line Items]
Principal amount						$ 100,000	$ 100,000	100,000
Less: unamortized discount and deferred loan costs						$ (280)	$ (280)	(343)
Contractual Maturity Date							Feb. 14, 2022
Description of variable rate basis						LIBOR
Basis spread on variable rate						1.20%
Effective Interest Rate						3.18%	3.18%
$100M Term Loan Facility | Minimum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate				1.20%			1.20%
Number of derivative instruments | swap						2	2
$100M Term Loan Facility | Maximum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate				1.70%			1.70%
$225M Term Loan Facility
Debt Instrument [Line Items]
Principal amount			$ 225,000
$225M Term Loan Facility | LIBOR
Debt Instrument [Line Items]
Principal amount						$ 225,000	$ 225,000	225,000
Less: unamortized discount and deferred loan costs						$ (1,569)	$ (1,569)	$ (1,398)
Contractual Maturity Date							Jan. 14, 2023
Description of variable rate basis						LIBOR
Basis spread on variable rate						1.20%
Effective Interest Rate						2.74%	2.74%
$225M Term Loan Facility | Minimum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.20%				1.20%	1.50%
Number of derivative instruments | swap						2	2
$225M Term Loan Facility | Maximum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.70%				1.70%	2.25%
$150 Million Term Loan Facility
Debt Instrument [Line Items]
Principal amount		$ 150,000
$150 Million Term Loan Facility | LIBOR
Debt Instrument [Line Items]
Principal amount						$ 150,000	$ 150,000	$ 0
Less: unamortized discount and deferred loan costs						$ (1,069)	$ (1,069)	0
Contractual Maturity Date							May 22, 2025
Description of variable rate basis						LIBOR
Basis spread on variable rate						1.50%
Effective Interest Rate						3.87%	3.87%
$150 Million Term Loan Facility | Minimum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
$150 Million Term Loan Facility | Maximum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		2.20%
$100 Million Notes | Senior notes
Debt Instrument [Line Items]
Principal amount						$ 100,000	$ 100,000	100,000
Less: unamortized discount and deferred loan costs						$ (519)	$ (519)	(576)
Contractual Maturity Date							Aug. 6, 2025
Stated Interest Rate						4.29%	4.29%
Effective Interest Rate						4.37%	4.37%
$125 Million Notes | Senior notes
Debt Instrument [Line Items]
Principal amount						$ 125,000	$ 125,000	125,000
Less: unamortized discount and deferred loan costs						$ (126)	$ (126)	$ (137)
Contractual Maturity Date							Jul. 13, 2027
Stated Interest Rate						3.93%	3.93%
Effective Interest Rate						3.94%	3.94%

Notes Payable - Summary of Aggr

Notes Payable - Summary of Aggregate Future Minimum Payments of Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
October 1, 2018 - December 31, 2018	$ 38
2,019	158
2,020	166
2,021	566
2,022	100,967
Thereafter	659,259
Total	$ 761,154	$ 671,658

Notes Payable - Additional Info

Notes Payable - Additional Information (Detail)	May 22, 2020	May 22, 2019	Jun. 27, 2018USD ($)extension	May 22, 2018USD ($)	Jan. 16, 2018USD ($)	Feb. 14, 2017USD ($)	Jul. 24, 2013	Sep. 30, 2018USD ($)extension	Sep. 30, 2018USD ($)extension	Dec. 31, 2017USD ($)
Debt Instrument [Line Items]
Principal amount								$ 761,154,000	$ 761,154,000	$ 671,658,000
Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate						0.50%
Eurodollar
Debt Instrument [Line Items]
Basis spread on variable rate						1.00%
Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Number of extensions | extension								2
Extension period								6 months
Unsecured Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment fee percentage if pricing structure is converted to be based on an investment-grade rating						0.125%
Unsecured Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Commitment fee percentage if pricing structure is converted to be based on an investment-grade rating						0.30%
Unsecured Revolving Credit Facility | Thirty-day LIBOR plus | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate						1.10%
Basis spread on variable rate if additional investment grade rating attained						0.825%
Unsecured Revolving Credit Facility | Thirty-day LIBOR plus | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate						1.50%
Basis spread on variable rate if additional investment grade rating attained						1.55%
Unsecured Revolving Credit Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate						0.10%
Basis spread on variable rate if additional investment grade rating attained						0.00%
Unsecured Revolving Credit Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate						0.50%
Basis spread on variable rate if additional investment grade rating attained						0.55%
$100M Term Loan Facility | Thirty-day LIBOR plus
Debt Instrument [Line Items]
Principal amount								$ 100,000,000	$ 100,000,000	100,000,000
Basis spread on variable rate								1.20%
$100M Term Loan Facility | Thirty-day LIBOR plus | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate						1.20%			1.20%
Basis spread on variable rate if additional investment grade rating attained						0.90%
$100M Term Loan Facility | Thirty-day LIBOR plus | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate						1.70%			1.70%
Basis spread on variable rate if additional investment grade rating attained						1.75%
$100M Term Loan Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate						0.20%
Basis spread on variable rate if additional investment grade rating attained						0.00%
$100M Term Loan Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate						0.70%
Basis spread on variable rate if additional investment grade rating attained						0.75%
$225M Term Loan Facility
Debt Instrument [Line Items]
Principal amount					$ 225,000,000
$225M Term Loan Facility | Thirty-day LIBOR plus
Debt Instrument [Line Items]
Principal amount								$ 225,000,000	$ 225,000,000	$ 225,000,000
Basis spread on variable rate								1.20%
$225M Term Loan Facility | Thirty-day LIBOR plus | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate					1.20%				1.20%	1.50%
$225M Term Loan Facility | Thirty-day LIBOR plus | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate					1.70%				1.70%	2.25%
$225M Term Loan Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate					0.20%					0.50%
$225M Term Loan Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate					0.70%					1.25%
$150 Million Term Loan Facility
Debt Instrument [Line Items]
Principal amount				$ 150,000,000
Debt instrument - contingent additional borrowings				$ 100,000,000
$150 Million Term Loan Facility | Thirty-day LIBOR plus
Debt Instrument [Line Items]
Principal amount								$ 150,000,000	$ 150,000,000	$ 0
Basis spread on variable rate								1.50%
$150 Million Term Loan Facility | Thirty-day LIBOR plus | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate				1.50%
Basis spread on variable rate if additional investment grade rating attained				1.40%
$150 Million Term Loan Facility | Thirty-day LIBOR plus | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate				2.20%
Basis spread on variable rate if additional investment grade rating attained				2.35%
$150 Million Term Loan Facility | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate				0.50%
$150 Million Term Loan Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate				0.50%
Basis spread on variable rate if additional investment grade rating attained				0.40%
$150 Million Term Loan Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate				1.20%
Basis spread on variable rate if additional investment grade rating attained				1.35%
$150 Million Term Loan Facility | Eurodollar | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate				1.00%
$60M Term Loan
Debt Instrument [Line Items]
Principal amount			$ 60,000,000
Number of extensions | extension			1
Extension period			24 months
Interest payment extension period			36 months
Principal payment			$ 65,250,000
$60M Term Loan | Thirty-day LIBOR plus
Debt Instrument [Line Items]
Principal amount								$ 58,499,000	$ 58,499,000	58,891,000
Basis spread on variable rate			1.70%				1.90%	1.70%
Number of extensions | extension									1
Extension period									24 months
Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment fee percentage									0.15%
Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Commitment fee percentage									0.30%
Revolving Credit Facility | Thirty-day LIBOR plus
Debt Instrument [Line Items]
Principal amount								$ 0	$ 0	$ 60,000,000
Basis spread on variable rate								1.10%
Number of extensions | extension									2
Extension period									6 months
Revolving Credit Facility | Thirty-day LIBOR plus | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate									1.10%
Revolving Credit Facility | Thirty-day LIBOR plus | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate									1.50%
$100M Senior notes
Debt Instrument [Line Items]
Principal amount								$ 100,000,000	$ 100,000,000
Senior Notes, 100 and 125 Million
Debt Instrument [Line Items]
Maximum ratio of secured debt to total asset value								40.00%	40.00%
Senior Notes, 100 and 125 Million | Credit Facility And Term Loan Facility, 225 and 150 Million
Debt Instrument [Line Items]
Maximum ratio of total indebtedness to total asset value								60.00%	60.00%
Maximum ratio of recourse debt to total asset								15.00%	15.00%
Minimum tangible net worth required								$ 760,740,750	$ 760,740,750
Minimum percentage of equity proceeds to be used in minimum tangible net worth calculation								75.00%	75.00%
Minimum ratio of EBITDA to fixed charges								1.50	1.50
Maximum ratio of unsecured debt to the value of the unencumbered asset pool								60.00%	60.00%
Minimum ratio of NOI unsecured interest expense								1.75	1.75
Funds from operations percentage									95.00%
$125M senior notes
Debt Instrument [Line Items]
Principal amount								$ 125,000,000	$ 125,000,000
Line of Credit | Unsecured Credit Facility | 450 Million Senior Credit Facility
Debt Instrument [Line Items]
Debt instrument - contingent additional borrowings						$ 550,000,000
Credit facility maximum future borrowing capacity						450,000,000
Line of Credit | Term Loan | $100M Term Loan Facility
Debt Instrument [Line Items]
Credit facility maximum future borrowing capacity						100,000,000
Line of Credit | Term Loan | $225M Term Loan Facility | Thirty-day LIBOR plus
Debt Instrument [Line Items]
Maximum ratio of secured debt to total asset value								45.00%	45.00%
Line of Credit | Revolving Credit Facility | Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility maximum future borrowing capacity						$ 350,000,000
Fixed Rate Debt | $60M Term Loan
Debt Instrument [Line Items]
Debt service coverage ratio								110.00%
Unsecured Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Additional availability								$ 350,000,000	$ 350,000,000
Additional Investment Grade Rating | $225M Term Loan Facility | Thirty-day LIBOR plus | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate					0.90%				1.40%
Additional Investment Grade Rating | $225M Term Loan Facility | Thirty-day LIBOR plus | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate					1.75%				2.35%
Additional Investment Grade Rating | $225M Term Loan Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate					0.00%				0.40%
Additional Investment Grade Rating | $225M Term Loan Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate					0.75%				1.35%
Scenario, Forecast | $150 Million Term Loan Facility
Debt Instrument [Line Items]
Prepayment premium, percent	1.00%	2.00%

Operating Leases - Future Minim

Operating Leases - Future Minimum Base Rate for Predecessor Under Operating Leases (Detail) $ in Thousands	Sep. 30, 2018USD ($)
Operating Leases, Future Minimum Payments Receivable [Abstract]
2,019	$ 168,276
2,020	145,541
2,021	111,805
2,022	77,779
2,023	58,081
Thereafter	210,050
Total	$ 771,532

Interest Rate Swaps - Summary o

Interest Rate Swaps - Summary of Interest Rate Swap Agreements (Detail) - USD ($)	3 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Interest Rate Swap 1
Derivative [Line Items]
Interest rate swap agreement, effective date	Jan. 15, 2015
Interest rate swap agreement, maturity date	Feb. 15, 2019
Interest Strike Rate	1.826%
Current Notional Value	$ 30,000,000	$ 30,000,000
Fair Value	$ 61,000	(11,000)
Interest Rate Swap 2
Derivative [Line Items]
Interest rate swap agreement, effective date	Jul. 15, 2015
Interest rate swap agreement, maturity date	Feb. 15, 2019
Interest Strike Rate	2.01%
Current Notional Value	$ 28,304,000	28,891,000
Fair Value	$ 37,000	(70,000)
Interest Rate Swap 3
Derivative [Line Items]
Interest rate swap agreement, effective date	Aug. 14, 2015
Interest rate swap agreement, maturity date	Dec. 14, 2018
Interest Strike Rate	1.79%
Current Notional Value	$ 50,000,000	50,000,000
Fair Value	$ 49,000	(18,000)
Interest Rate Swap 4
Derivative [Line Items]
Interest rate swap agreement, effective date	Feb. 16, 2016
Interest rate swap agreement, maturity date	Dec. 14, 2018
Interest Strike Rate	2.005%
Current Notional Value	$ 50,000,000	50,000,000
Fair Value	$ 27,000	(120,000)
Interest Rate Swap 5
Derivative [Line Items]
Interest rate swap agreement, effective date	Feb. 14, 2018
Interest rate swap agreement, maturity date	Jan. 14, 2022
Interest Strike Rate	1.349%
Current Notional Value	$ 125,000,000	0
Fair Value	$ 6,037,000	3,582,000
Interest Rate Swap 6
Derivative [Line Items]
Interest rate swap agreement, effective date	Aug. 14, 2018
Interest rate swap agreement, maturity date	Jan. 14, 2022
Interest Strike Rate	1.406%
Current Notional Value	$ 100,000,000	0
Fair Value	$ 4,673,000	2,521,000
Interest Rate Swap 7
Derivative [Line Items]
Interest rate swap agreement, effective date	Dec. 14, 2018
Interest rate swap agreement, maturity date	Aug. 14, 2021
Interest Strike Rate	1.764%
Current Notional Value	$ 0	0
Fair Value	$ 2,967,000	$ 1,090,000

Interest Rate Swaps - Impact of

Interest Rate Swaps - Impact of Interest Rate Swaps on Consolidated Statements of Operations - (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative [Line Items]
Total interest expense presented in the Consolidated Statement of Operations in which the effects of cash flow hedges are recorded (line item “Interest expense”)	$ 6,456	$ 6,271	$ 18,760	$ 14,571
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Derivative [Line Items]
Amount of gain (loss) recognized in AOCI on derivatives	1,212	382	7,382	(672)
Amount of gain (loss) reclassified from AOCI into earnings under “Interest expense”	$ 397	$ (280)	$ 505	$ (1,090)

Interest Rate Swaps - Addition

Interest Rate Swaps - Additional Information (Detail) $ in Millions	Sep. 30, 2018USD ($)
Derivative Instrument Detail [Abstract]
Amount estimated to be reclassified during next 12 months from AOCI into earnings as a decrease to interest expense	$ 3.7

Interest Rate Swaps - Offsettin

Interest Rate Swaps - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Offsetting Derivative Assets [Abstract]
Gross Amounts of Recognized Assets	$ 13,851	$ 7,193
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	13,851	7,193
Financial Instruments	0	(219)
Cash Collateral Received	0	0
Net Amount	13,851	6,974
Offsetting Derivative Liabilities [Abstract]
Gross Amounts of Recognized Liabilities	0	219
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	0	219
Financial Instruments	0	(219)
Cash Collateral Received	0	0
Net Amount	$ 0	$ 0

Fair Value Measurements - Asset

Fair Value Measurements - Assets Measures at Fair Value on a Recurring Basis by Level within Fair Value Hierarchy (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Interest rate swap asset	$ 13,851	$ 7,193
Interest Rate Swap Liability	0	(219)
Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Interest rate swap asset	13,851	7,193
Interest Rate Swap Liability	$ 0	$ (219)

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Value and Estimated Fair Value of Notes Payable (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Notes payable, fair value	$ 752,722	$ 673,377
Carrying value	757,218	668,941
Significant Unobservable Inputs (Level 3)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Notes payable, fair value	$ 752,722	$ 673,377

Related Party Transactions (Det

Related Party Transactions (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Chief Executive Officer
Related Party Transaction [Line Items]
Revenue from management and leasing services	$ 0.1	$ 0.1	$ 0.3	$ 0.3

Commitments and Contingencies_2

Commitments and Contingencies (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)tenant	Sep. 30, 2017USD ($)	Dec. 31, 2017USD ($)	Feb. 25, 2014USD ($)
Commitments And Contingencies [Line Items]
Estimated remediation, processing and oversight costs						$ 1,300,000
Holdback Escrow total funded						1,400,000
Holdback Escrow seller funded						1,300,000
Holdback Escrow buyer funded						100,000
Maximum seller liability remediation costs						$ 1,300,000
Contingent liability	$ 1,100,000		$ 1,100,000		$ 1,100,000
Indemnification asset	1,100,000		$ 1,100,000		$ 1,100,000
Ground Lease Expiration Date			Jun. 1, 2062
Other commitments	25,500,000		$ 25,500,000
Cash, FDIC Insured Amount	250,000		$ 250,000
Customer Concentration Risk | Base Rent
Commitments And Contingencies [Line Items]
Number of major tenants | tenant			0
Customer Concentration Risk | Total Rental Revenues
Commitments And Contingencies [Line Items]
Concentration risk, percentage			5.00%
Ground Lease
Commitments And Contingencies [Line Items]
Rent expense	36,000	$ 36,000	$ 100,000	$ 100,000
Office Leases
Commitments And Contingencies [Line Items]
Rent expense	$ 200,000	$ 100,000	$ 500,000	$ 300,000

Commitments and Contingencies -

Commitments and Contingencies - Future Minimum Commitment (Detail) $ in Thousands	Sep. 30, 2018USD ($)
Office Leases
Operating Leased Assets [Line Items]
October 1, 2018 - December 31, 2018	$ 223
2,019	660
2,020	257
2,021	167
2,022	0
Thereafter	0
Total	1,307
Ground Lease
Operating Leased Assets [Line Items]
October 1, 2018 - December 31, 2018	36
2,019	144
2,020	144
2,021	144
2,022	144
Thereafter	5,676
Total	$ 6,288

Dispositions and Real Estate _3

Dispositions and Real Estate Held For Sale - Dispositions (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)ft²	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)ft²	Sep. 30, 2017USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable square feet | ft²	2,224,201		2,224,201
Gains on sale of real estate	$ 0	$ 0	$ 11,591	$ 19,237
Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rentable square feet | ft²	230,435		230,435
Disposition Sales Price	$ 37,581		$ 37,581
Gains on sale of real estate			$ 11,591
8900-8980 Benson Avenue and 5637 Arrow Highway | Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date of Disposition			Jan. 2, 2018
Rentable square feet | ft²	88,016		88,016
Disposition Sales Price	$ 11,440		$ 11,440
Gains on sale of real estate			$ 4,029
700 Allen Avenue and 1851 Flower Street | Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date of Disposition			Jan. 17, 2018
Rentable square feet | ft²	25,168		25,168
Disposition Sales Price	$ 10,900		$ 10,900
Gains on sale of real estate			$ 4,753
200-220 South Grand Avenue | Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date of Disposition			Mar. 7, 2018
Rentable square feet | ft²	27,200		27,200
Disposition Sales Price	$ 4,515		$ 4,515
Gains on sale of real estate			$ 1,201
6770 Central Avenue—Building B | Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date of Disposition			Apr. 9, 2018
Rentable square feet | ft²	11,808		11,808
Disposition Sales Price	$ 1,676		$ 1,676
Gains on sale of real estate			$ 1,113
1910-1920 Archibald Avenue | Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date of Disposition			May 9, 2018
Rentable square feet | ft²	78,243		78,243
Disposition Sales Price	$ 9,050		$ 9,050
Gains on sale of real estate			$ 495

Dispositions and Real Estate _4

Dispositions and Real Estate Held For Sale - Real Estate Held For Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Long Lived Assets Held-for-sale [Line Items]
Real estate held for sale		$ 13,296
Accumulated depreciation		(1,609)
Real estate held for sale, net		11,687
Acquired lease intangible assets, net		71
Other assets associated with real estate held for sale		678
Total assets associated with real estate held for sale, net	$ 0	12,436
Tenant security deposits		193
Other liabilities associated with real estate held for sale		50
Total liabilities associated with real estate held for sale	$ 0	243
Land
Long Lived Assets Held-for-sale [Line Items]
Real estate held for sale		5,671
Buildings and improvements
Long Lived Assets Held-for-sale [Line Items]
Real estate held for sale		7,180
Tenant improvements
Long Lived Assets Held-for-sale [Line Items]
Real estate held for sale		429
Construction in progress
Long Lived Assets Held-for-sale [Line Items]
Real estate held for sale		$ 16

Equity - Common Stock (Details)

Equity - Common Stock (Details) - USD ($)	Jun. 13, 2018	Sep. 30, 2018	Jun. 12, 2018
Class of Stock [Line Items]
Common stock share price (in dollars per share)		$ 30.70
At-The-Market Equity Offering Program $400M
Class of Stock [Line Items]
Maximum aggregate offering amount	$ 400,000,000
Shares available under ATM (in shares)		$ 196,800,000
At-The-Market Equity Offering Program $300M
Class of Stock [Line Items]
Gross proceeds from the issuance of common stock			$ 300,000,000
At The Market Equity Offering Program, 400 And 300 Million [Member]
Class of Stock [Line Items]
Gross proceeds from the issuance of common stock		$ 432,300,000
Issuance of common stock (in shares)		14,081,074
Net proceeds from issuance of common stock		$ 425,800,000

Equity - Noncontrolling Interes

Equity - Noncontrolling Interests (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Class of Stock [Line Items]
Conversion of units to common stock	$ 600
Noncontrolling Interests
Class of Stock [Line Items]
Conversion of units to common stock	$ (560)	$ (618)
Common Stock
Class of Stock [Line Items]
Conversion of units to common stock (in shares)	60,175	61,256
Partnership Interest | Equity | Noncontrolling Interests
Class of Stock [Line Items]
Noncontrolling interest percentage ownership in Operating Partnership	2.10%
Partnership Interest | Equity | Noncontrolling Interests | Operating Partnership Units
Class of Stock [Line Items]
Operating partnership units outstanding	1,845,565
Partnership Interest | Equity | Noncontrolling Interests | Vested LTIP Units
Class of Stock [Line Items]
Operating partnership units outstanding	157,539

Equity - 2013 Incentive Award P

Equity - 2013 Incentive Award Plan (Details) - shares	9 Months Ended
	Sep. 30, 2018	Jun. 11, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Performance Unit Distribution Sharing Percentage	10.00%
Amended and Restated Two Thousand Thirteen Incentive Award Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares that may be issued (in shares)		1,770,000
Common stock, shares reserved for future issuance	2,162,877

Equity - Schedule of Nonvested

Equity - Schedule of Nonvested Restricted Stock Activity (Detail) - shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
June 30, 2018 (in shares)	209,214
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares tendered in accordance with terms of plan to satisfy tax withholding (in shares)	20,663	31,403
Restricted Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance at January 1, 2018 (in shares)	190,695
Granted (in shares)	103,443
Forfeited (in shares)	(13,031)
Vested (in shares)	(71,893)
June 30, 2018 (in shares)	209,214
LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance at January 1, 2018 (in shares)	293,485
Granted (in shares)	57,443
Forfeited (in shares)	0
Vested (in shares)	(45,034)
June 30, 2018 (in shares)	305,894
Performance Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance at January 1, 2018 (in shares)	703,248
Granted (in shares)	0
Forfeited (in shares)	0
Vested (in shares)	0
June 30, 2018 (in shares)	703,248

Equity - Vesting Schedule of th

Equity - Vesting Schedule of the Nonvested Shares of Restricted Stock Outstanding (Detail) - shares	Dec. 15, 2017	Dec. 29, 2016	Dec. 15, 2015	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				209,214	209,214
TSR Target Percentage					50.00%
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Designated Absolute Total Shareholder Return Base Units, Company TSR Percentage					36.00%
Restricted Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				209,214	209,214	190,695
Restricted Common Stock | 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				21,572	21,572
LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				305,894	305,894	293,485
LTIP Units | October 1, 2018 - December 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				111,721	111,721
LTIP Units | 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				114,818	114,818
LTIP Units | 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				73,151	73,151
LTIP Units | 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				3,102	3,102
LTIP Units | 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				3,102	3,102
Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				703,248	703,248	703,248
Performance period				3 years	3 years
TSR performance percentage relative to peer group, maximum				75.00%	75.00%
Performance Units | October 1, 2018 - December 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				315,998	315,998
Performance Units | 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				199,000	199,000
Performance Units | 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				188,250	188,250
Performance Units | 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				0	0
Performance Units | 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				0	0
Unvested Shares Of Restricted Stock Expected To Vest In Two Thousand Eighteen | Restricted Common Stock | October 1, 2018 - December 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				9,933	9,933
Unvested Shares Of Restricted Stock Expected To Vest In Two Thousand Nineteen | Restricted Common Stock | 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				82,678	82,678
Unvested Shares Of Restricted Stock Expected To Vest In Two Thousand Twenty | Restricted Common Stock | 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				55,622	55,622
Amended 2013 Incentive Award Plan | Performance Units | Absolute TSR Vesting Percentage Range Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Designated Absolute Total Shareholder Return Base Units, Company TSR Percentage	36.00%	50.00%	50.00%
Amended 2013 Incentive Award Plan | Performance Units | Relative TSR Vesting Percentage Range Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Designated Absolute Total Shareholder Return Base Units, Peer Group Relative Performance	75.00%	75.00%	75.00%
Unvested Shares Of Restricted Stock Expected To Vest In Two Thousand Twenty One | Restricted Common Stock | 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares				39,409	39,409
Executive Officer | Amended 2013 Incentive Award Plan | Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years	3 years	3 years

Equity - Share-based Awards Exp

Equity - Share-based Awards Expensed & Capitalized Amounts (Details) - Amended 2013 Incentive Award Plan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expensed share-based compensation	$ 2,243	$ 1,329	$ 7,866	$ 4,070
Capitalized share-based compensation	73	7	183	120
Total share-based compensation	2,316	$ 1,336	8,049	$ 4,190
Unrecognized compensation expense related to non-vested shares	$ 9,800		$ 9,800
Weighted average remaining vesting period	25 months

Equity - Summary of the Compone

Equity - Summary of the Components of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			$ 1,365,254	$ 962,140
Other comprehensive income (loss) before reclassifications			7,382	(672)
Amounts reclassified from accumulated other comprehensive income to interest expense			505	(1,090)
Other comprehensive income (loss): cash flow hedge adjustment	$ 815	$ 662	6,877	418
Less other comprehensive (income) loss attributable to noncontrolling interests			(118)	7
Ending Balance	1,785,394	1,261,203	1,785,394	1,261,203
Accumulated Other Comprehensive Income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			6,799	3,445
Other comprehensive income (loss): cash flow hedge adjustment			6,759	425
Other comprehensive income (loss) attributable to common stockholders			6,759	425
Ending Balance	$ 13,558	$ 3,870	$ 13,558	$ 3,870

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income	$ 8,965	$ 2,009	$ 31,868	$ 27,585
Less: Preferred stock dividends	(2,423)	(1,322)	(7,270)	(3,966)
Less: net income attributable to noncontrolling interest	(141)	(21)	(588)	(684)
Less: Net income attributable to participating securities	(94)	(80)	(285)	(327)
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ 6,307	$ 586	$ 23,725	$ 22,608
Denominator:
Weighted average shares of common stock outstanding - basic (in shares)	91,463,594	72,621,219	84,407,429	68,984,047
Effect of dilutive securities - performance units (in shares)	481,612	446,862	518,043	380,808
Weighted average shares of common stock outstanding - diluted (in shares)	91,945,206	73,068,081	84,925,472	69,364,855
Earnings per share — Basic
Net income attributable to common stockholders - basic (in dollars per share)	$ 0.07	$ 0.01	$ 0.28	$ 0.33
Earnings per share — Diluted
Net income attributable to common stockholders - diluted (in dollars per share)	$ 0.07	$ 0.01	$ 0.28	$ 0.33

Earnings Per Share - TSR Perfor

Earnings Per Share - TSR Performance Percentile (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years	3 years

Subsequent Events (Detail)

Subsequent Events (Detail) $ / shares in Units, $ in Thousands	Oct. 29, 2018$ / shares	Sep. 30, 2018USD ($)ft²$ / shares	Sep. 30, 2017$ / shares	Sep. 30, 2018USD ($)ft²$ / shares	Sep. 30, 2017$ / shares	Dec. 31, 2017	Oct. 17, 2018USD ($)ft²
Subsequent Event [Line Items]
Dividends declared per common share (in dollars per share)		$ 0.160	$ 0.145	$ 0.480	$ 0.435
Purchase price | $		$ 361,102		$ 361,102
Rentable square feet | ft²		2,224,201		2,224,201
Series A Preferred Stock
Subsequent Event [Line Items]
Dividend percentage		5.875%		5.875%		5.875%
Series B Preferred Stock
Subsequent Event [Line Items]
Dividend percentage		5.875%		5.875%		5.875%
Subsequent Event | Common Stock
Subsequent Event [Line Items]
Dividends declared per common share (in dollars per share)	$ 0.16
Subsequent Event | Operating Partnership Units
Subsequent Event [Line Items]
Distributions declared (in dollars per share)	0.16
1332-1340 Rocky Point | Subsequent Event
Subsequent Event [Line Items]
Purchase price | $							$ 10,200
Rentable square feet | ft²							73,747
Series B Preferred Stock | Subsequent Event | Series B Preferred Stock
Subsequent Event [Line Items]
Dividends per share, declared (in dollars per share)	0.367188
Series A Preferred Stock | Subsequent Event | Series A Preferred Stock
Subsequent Event [Line Items]
Dividends per share, declared (in dollars per share)	$ 0.367188