PS Business Parks (PSBXP) 10-K 24 Feb 17 2016 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 20, 2017	Jun. 30, 2016
Document And Entity Information [Abstract]
Document Type	10-K
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Registrant Name	PS BUSINESS PARKS INC/CA
Entity Central Index Key	866,368
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		27,138,138
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 2,082,893,848

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 128,629	$ 188,912
Real estate facilities, at cost:
Land	789,531	793,569
Buildings and improvements	2,226,881	2,215,515
Gross real estate investment property	3,016,412	3,009,084
Accumulated depreciation	(1,159,808)	(1,082,603)
Net real estate investment property	1,856,604	1,926,481
Land and building held for development	27,028	6,081
Total real estate investments	1,883,632	1,932,562
Investment in and advances to unconsolidated joint venture	67,190	26,736
Rent receivable, net	1,945	2,234
Deferred rent receivable, net	29,770	28,327
Other assets	8,205	7,887
Total assets	2,119,371	2,186,658
LIABILITIES AND EQUITY
Accrued and other liabilities	78,657	76,059
Preferred stock called for redemption	230,000
Mortgage note payable		250,000
Total liabilities	308,657	326,059
Commitments and contingencies
PS Business Parks, Inc.'s shareholders' equity:
Preferred stock, $0.01 par value, 50,000,000 shares authorized,35,190 and 36,800 shares issued and outstanding at December 31, 2016 and December 31, 2015, respectively	879,750	920,000
Common stock, $0.01 par value, 100,000,000 shares authorized, 27,138,138 and 27,034,073 shares issued and outstanding at December 31, 2016 and December 31, 2015, respectively	271	269
Paid-in capital	733,671	722,009
Cumulative net income	1,502,643	1,375,421
Cumulative distributions	(1,503,076)	(1,357,203)
Total PS Business Parks, Inc.'s shareholders' equity	1,613,259	1,660,496
Noncontrolling interests:
Common units	197,455	200,103
Total noncontrolling interests	197,455	200,103
Total equity	1,810,714	1,860,599
Total liabilities and equity	$ 2,119,371	$ 2,186,658

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Consolidated Balance Sheets [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	35,190	36,800
Preferred stock, shares outstanding	35,190	36,800
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	27,138,138	27,034,073
Common stock, shares outstanding	27,138,138	27,034,073

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues:
Rental income	$ 386,871	$ 373,135	$ 376,255
Facility management fees	518	540	660
Total operating revenues	387,389	373,675	376,915
Expenses:
Cost of operations	123,108	121,224	127,371
Depreciation and amortization	99,486	105,394	110,357
General and administrative	14,862	13,582	13,639
Total operating expenses	237,456	240,200	251,367
Other income and (expenses):
Interest and other income	715	590	372
Interest and other expenses	(5,664)	(13,330)	(13,593)
Total other income and (expenses)	(4,949)	(12,740)	(13,221)
Gain on sale of real estate facilities		28,235	92,373
Net income	144,984	148,970	204,700
Net income allocable to noncontrolling interests:
Noncontrolling interests - common units	16,955	18,495	30,729
Total net income allocable to noncontrolling interests	16,955	18,495	30,729
Net income allocable to PS Business Parks, Inc.:
Preferred shareholders	64,588	61,885	60,488
Restricted stock unit holders	569	299	329
Common shareholders	62,872	68,291	113,154
Total net income allocable to PS Business Parks, Inc.	128,029	130,475	173,971
Net income	$ 144,984	$ 148,970	$ 204,700
Net income per common share:
Basic	$ 2.32	$ 2.53	$ 4.21
Diluted	$ 2.31	$ 2.52	$ 4.19
Weighted average common shares outstanding:
Basic	27,089	26,973	26,899
Diluted	27,179	27,051	27,000

Consolidated Statement Of Equit

Consolidated Statement Of Equity - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Paid-In Capital [Member]	Cumulative Net Income [Member]	Cumulative Distributions [Member]	Total PS Business Parks, Inc.'s Shareholders' Equity [Member]	Noncontrolling Interests [Member]	Total
Balances, value at Dec. 31, 2013	$ 995,000	$ 267	$ 699,314	$ 1,070,975	$ (1,047,615)	$ 1,717,941	$ 196,699	$ 1,914,640
Balances, shares at Dec. 31, 2013	39,800	26,849,822
Issuance of common stock in connection with stock-based compensation		$ 1	3,053			3,054		3,054
Issuance of common stock in connection with stock-based compensation, shares		69,339
Stock compensation, net			8,842			8,842		8,842
Net income								204,700
Total net income allocable to PS Business Parks, Inc				173,971		173,971		173,971
Total net income allocable to noncontrolling interests							30,729	30,729
Distributions:
Preferred stock					(60,488)	(60,488)		(60,488)
Common stock					(127,838)	(127,838)		(127,838)
Noncontrolling interests							(34,701)	(34,701)
Adjustment to noncontrolling interests in underlying operating partnership			(2,201)			(2,201)	2,201
Balances, value at Dec. 31, 2014	$ 995,000	$ 268	709,008	1,244,946	(1,235,941)	1,713,281	194,928	1,908,209
Balances, shares at Dec. 31, 2014	39,800	26,919,161
Redemption of preferred stock, net of issuance costs, value	$ (75,000)		2,487		(2,487)	(75,000)		(75,000)
Redemption of preferred stock, net of issuance costs, shares	(3,000)
Issuance of common stock in connection with stock-based compensation		$ 1	5,088			5,089		5,089
Issuance of common stock in connection with stock-based compensation, shares		114,912
Stock compensation, net			8,178			8,178		8,178
Net income								148,970
Total net income allocable to PS Business Parks, Inc				130,475		130,475		130,475
Total net income allocable to noncontrolling interests							18,495	18,495
Distributions:
Preferred stock					(59,398)	(59,398)		(59,398)
Common stock					(59,377)	(59,377)		(59,377)
Noncontrolling interests							(16,072)	(16,072)
Adjustment to noncontrolling interests in underlying operating partnership			(2,752)			(2,752)	2,752
Balances, value at Dec. 31, 2015	$ 920,000	$ 269	722,009	1,375,421	(1,357,203)	1,660,496	200,103	1,860,599
Balances, shares at Dec. 31, 2015	36,800	27,034,073
Cumulative effect of a change in accounting principle (Note 11)			807	(807)
Issuance of preferred stock, net of issuance costs, value	$ 189,750		(6,434)			183,316		183,316
Issuance of preferred stock, net of issuance costs, shares	7,590
Redemption of preferred stock, net of issuance costs, value	$ (230,000)		7,312		(7,312)	(230,000)		(230,000)
Redemption of preferred stock, net of issuance costs, shares	(9,200)
Issuance of common stock in connection with stock-based compensation		$ 2	3,886			3,888		3,888
Issuance of common stock in connection with stock-based compensation, shares		104,065
Stock compensation, net			8,404			8,404		8,404
Net income								144,984
Total net income allocable to PS Business Parks, Inc				128,029		128,029		128,029
Total net income allocable to noncontrolling interests							16,955	16,955
Distributions:
Preferred stock					(57,276)	(57,276)		(57,276)
Common stock					(81,285)	(81,285)		(81,285)
Noncontrolling interests							(21,916)	(21,916)
Adjustment to noncontrolling interests in underlying operating partnership			(2,313)			(2,313)	2,313
Balances, value at Dec. 31, 2016	$ 879,750	$ 271	$ 733,671	$ 1,502,643	$ (1,503,076)	$ 1,613,259	$ 197,455	$ 1,810,714
Balances, shares at Dec. 31, 2016	35,190	27,138,138

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	$ 144,984	$ 148,970	$ 204,700
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	99,486	105,394	110,357
In-place lease adjustment	(520)	(1,251)	(901)
Tenant improvement reimbursements, net of lease incentives	(1,666)	(1,861)	(1,580)
Gain on sale of real estate facilities		(28,235)	(92,373)
Stock compensation	10,913	9,245	9,580
Decrease (increase) in receivables and other assets	(2,022)	(989)	792
Increase (decrease) in accrued and other liabilities	(668)	7,566	(2,395)
Total adjustments	105,523	89,869	23,480
Net cash provided by operating activities	250,507	238,839	228,180
Cash flows from investing activities:
Capital expenditures to real estate facilities	(31,877)	(43,654)	(51,786)
Capital expenditures to land and building held for development	(49)	(2,809)	(2,189)
Investment in and advances to unconsolidated joint venture	(40,454)	(5,566)
Acquisition of real estate facilities	(12,628)		(45,021)
Proceeds from sale of real estate facilities		55,160	212,184
Net cash (used in) provided by investing activities	(85,008)	3,131	113,188
Cash flows from financing activities:
Proceeds from the exercise of stock options	3,888	5,089	3,054
Redemption of preferred stock		(75,000)
Cash paid for taxes in lieu of shares upon vesting of restricted stock units	(1,940)	(767)	(409)
Cash paid to restricted stock unit holders	(569)
Distributions paid to preferred shareholders	(57,276)	(59,398)	(60,488)
Distributions paid to common shareholders	(81,285)	(59,377)	(127,838)
Distributions paid to noncontrolling interests	(21,916)	(16,072)	(34,701)
Borrowings on credit facility	116,000
Repayment of borrowings on credit facility	(116,000)
Repayment of mortgage note payable	(250,000)
Net proceeds from the issuance of preferred stock	183,316
Net cash used in financing activities	(225,782)	(205,525)	(220,382)
Net (decrease) increase in cash and cash equivalents	(60,283)	36,445	120,986
Cash and cash equivalents at the beginning of the period	188,912	152,467	31,481
Cash and cash equivalents at the end of the period	128,629	188,912	152,467
Supplemental disclosures:
Interest paid	7,395	14,197	14,200
Adjustment to noncontrolling interests in underlying operating partnership:
Noncontrolling interests - common units	2,313	2,752	2,201
Paid-in capital	(2,313)	(2,752)	$ (2,201)
Non-cash distributions related to the redemption of preferred stock:
Paid-in capital	7,312	2,487
Cumulative distributions	(7,312)	(2,487)
Preferred stock called for redemption:
Preferred stock called for redemption and reclassified to liabilities	230,000
Preferred stock called for redemption and reclassified from equity	(230,000)
Transfer to land and building held for development:
Land	(9,676)
Buildings and improvements	(19,092)
Accumulated depreciation	7,870
Land and building held for development	20,898
Cumulative effect of a change in accounting principle (Note 11):
Paid-in capital	807
Cumulative net income	$ (807)
Transfer to investment in and advances to unconsolidated joint venture:
Land and building held for development		(21,170)
Investment in and advances to unconsolidated joint venture		$ 21,170

Organization And Description Of

Organization And Description Of Business	12 Months Ended
	Dec. 31, 2016
Organization And Description Of Business [Abstract]
Organization And Description Of Business	1. Organization and description of business  Organization  PS Business Parks, Inc. (“PSB”) was incorporated in the state of California in 1990. As of December 31, 2016 , PSB owned 77.9 % of the common partnership units (the “common partnership units”) of PS Business Parks, L.P. (the “Operating Partnership”). The remaining common partnership units are owned by Public Storage (“PS”). PSB, as the sole general partner of the Operating Partnership, has full, exclusive and complete responsibility and discretion in managing and controlling the Operating Partnership. PSB and its subsidiaries, including the Operating Partnership , are collectively referred to as the “Company.” Assuming issuance of the Company’s common stock upon redemption of its common partnership units, PS would own 42. 0 % (or 14.5 million shares) of the outstanding shares of the Company’s common stock.  Description of business  The Company is a fully-integrated, self-advised and self-managed real estate investment trust (“REIT”) that owns, operates, acquires and develops commercial properties, primarily multi-tenant flex, office and industrial space. As of December 31, 2016 , the Company owned and operated 28.1 million rentable square feet of commercial space in six states. The Company also manages 684,000 rentable square feet on behalf of PS.  References to the number of properties or square footage are unaudited and outside the scope of the Company’s independent registered public accounting firm's audit of the Company’s financial statements in accordance with the standards of the Public Company Accounting Oversight Board (United States).

Summary Of Significant Accounti

Summary Of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
Summary Of Significant Accounting Policies [Abstract]
Summary Of Significant Accounting Policies	2. Summary of significant accounting policies  Basis of presentation  The accompanying consolidated financial statements include the accounts of PSB and the Operating Partnership. All significant inter-company balances and transactions have been eliminated in the consolidated financial statements. The financial statements are presented on an accrual basis in accordance with U.S. generally accepted accounting principles (“GAAP”).  Consolidation and Equity Method of Accounting  The Company accounts for its investment in a joint venture that it has significant influence over, but does not control, using the equity method of accounting eliminating intra-entity profits and losses as if the joint venture were a consolidated subsidiary.  The Company consolidates all variable interest entities (each a “VIE”) for which it is the primary beneficiary. Generally, a VIE is a legal entity in which the equity investors do not have the characteristics of a controlling financial interest or the equity investors lack sufficient equity at risk for the entity to finance its activities without additional subordinated financial support. A limited partnership may be considered a VIE if the limited partners do not participate in operating decisions. Under this criteria, the Operating Partnership is considered a VIE. The Company’s significant asset is its investment in the Operating Partnership, and consequently, substantially all of the Company’s assets and liabilities represent those assets and liabilities of the Operating Partnership. All of the Company’s debt is an obligation of the Operating Partnership.  Noncontrolling interests  The Company's noncontrolling interests are reported as a component of equity separate from the parent’s equity. Purchases or sales of equity interests that do not result in a change in control are accounted for as equity transactions. In addition, net income attributable to the noncontrolling interests is included in net income on the face of the income statement and, upon a gain or loss of control, the interests purchased or sold, as well as any interests retained, are recorded at fair value with any gain or loss recognized in earnings. At the end of each reporting period, the Company determines the amount of equity (book value of net assets) which is allocable to the noncontrolling interests based upon the ownership interest, and an adjustment is made to the noncontrolling interests, with a corresponding adjustment to paid-in capital, to reflect the noncontrolling interests’ equity interest in the Company.  Use of estimates  The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from these estimates.  Allowance for doubtful accounts  The Company monitors the collectability of its receivable balances including the deferred rent receivable on an ongoing basis. Based on these reviews, the Company maintains an allowance for doubtful accounts for estimated losses resulting from the possible inability of tenants to make contractual rent payments to the Company. A provision for doubtful accounts is recorded during each period. The allowance for doubtful accounts is netted against tenant and other receivables on the consolidated balance sheets. Tenant receivables are net of an allowance for uncollectible accounts totaling $ 400,000 at December 31, 2016 and 2015 . Deferred rent receivable is net of an allowance for uncollectible accounts totaling $916,000 and $909,000 at December 31, 2016 and 2015 , respectively.  Financial instruments  The methods and assumptions used to estimate the fair value of financial instruments are described below. The Company has estimated the fair value of financial instruments using available market information and appropriate valuation methodologies. Considerable judgment is required in interpreting market data to develop estimates of market value. Accordingly, estimated fair values are not necessarily indicative of the amounts that could be realized in current market exchanges. The Company determines the estimated fair value of financial assets and liabilities utilizing a hierarchy of valuation techniques based on whether the inputs to a fair value measurement are considered to be observable or unobservable in a marketplace. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect market assumptions. This hierarchy requires the use of observable market data when available. The following is the fair value hierarchy:  · Level 1 —quoted prices for identical instruments in active markets;  · Level 2 —quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which significant inputs and significant value drivers are observable in active markets; and  · Level 3 —fair value measurements derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.  Financial assets that are exposed to credit risk consist primarily of cash and cash equivalents and receivables. The Company considers all highly liquid investments with a remaining maturity of three months or less at the date of purchase to be cash equivalents. Cash and cash equivalents, which consist primarily of money market investments, are only invested in entities with an investment grade rating. Receivables are comprised of balances due from a large number of customers. Balances that the Company expects to become uncollectible are reserved for or written off. Due to the short period to maturity of the Company’s cash and cash equivalents, accounts receivable, other assets and accrued and other liabilities, the carrying values as presented on the consolidated balance sheets are reasonable estimates of fair value.  Carrying values of the Company’s mortgage note payable and unsecured Credit Facility (as defined on page 62) approximate fair value. The characteristics of these financial instruments, market data and other comparative metrics utilized in determining these fair values are “Level 2” inputs. Real estate facilities  Real estate facilities are recorded at cost. Costs related to the renovation or improvement of the properties are capitalized. Expenditures for repairs and maintenance are expensed as incurred. Expenditures that are expected to benefit a period greater than two years and exceed $ 2,000 are capitalized and depreciated over their estimated useful life. Buildings and improvements are depreciated using the straight-line method over their estimated useful lives, which generally range from five to 30 years. Transaction costs, which include tenant improvements and lease commissions, of $ 1,000 or more for leases with terms greater than one year are capitalized and depreciated over their estimated useful lives. Transaction costs less than $ 1,000 or for leases of one year or less are expensed as incurred.  Land and building held for development  Property taxes, insurance, interest and costs essential to the development of property for its intended use are capitalized during the period of development. Upon classification of an asset as held for development, depreciation of the asset is ceased.  Properties held for disposition  An asset is classified as an asset held for disposition when it meets certain requirements, which include, among other criteria, the approval of the sale of the asset, the marketing of the asset for sale and the expectation by the Company that the sale will likely occur within the next 12 months. Upon classification of an asset as held for disposition, depreciation of the asset is ceased, and the net book value of the asset is included on the balance sheet as properties held for disposition.  Intangible assets/liabilities  Intangible assets and liabilities include above-market and below-market in-place lease values of acquired properties based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place leases and (ii) management’s estimate of fair market lease rates for the corresponding in-place leases, measured over a period equal to the remaining non-cancelable term of the lease. The capitalized above-market and below-market lease values (included in other assets and accrued liabilities in the accompanying consolidated balance sheets) are amortized to rental income over the remaining non-cancelable terms of the respective leases.  As of December 31, 2016 , the value of in-place leases resulted in net intangible assets of $ 1. 1 million, net of $ 9.2 million of accumulated amortization with a weighted average amortization period of 9.3 years and net intangible liabilities of $784,000 , net of $ 10. 0 million of accumulated amortization with a weighted average amortization period of 6.6 years. As of December 31, 2015 , the value of in-place leases resulted in net intangible assets of $ 1.7 million, net of $ 8.6 million of accumulated amortization and net intangible liabilities of $ 1.8 million, net of $ 9.0 million of accumulated amortization.  The Company recorded a net increase in rental income of $520,000 , $1.3 million and $901,000 during the years end ed December 31, 2016 , 2015 and 2014 , respectively, related to the amortization of net intangible liabilities resulting from the above-market and below-market lease value s.  Evaluation of asset impairment  The Company evaluates its assets used in operations for impairment by identifying indicators of impairment and by comparing the sum of the estimated undiscounted future cash flows for each asset to the asset’s carrying value. When indicators of impairment are present and the sum of the estimated undiscounted future cash flows is less than the carrying value of such asset, an impairment loss is recorded equal to the difference between the asset’s current carrying value and its value based on discounting its estimated future cash flows. In addition, the Company evaluates its assets held for disposition for impairment. Assets held for disposition are reported at the lower of their carrying value or fair value, less cost of disposition. At December 31, 2016 , the Company did not consider any assets to be impaired.  Asset impairment due to casualty loss  It is the Company’s policy to record as a casualty loss or gain, in the period the casualty occurs, the differential between (a) the book value of assets destroyed and (b) any insurance proceeds that the Company expects to receive in accordance with its insurance contracts. Potential proceeds from insurance that are subject to any uncertainties, such as interpretation of deductible provisions of the governing agreements, the estimation of costs of restoration, or other such items, are treated as contingent proceeds and not recorded until the uncertainties are satisfied.  For the years ended December 31, 2016 , 2015 and 2014 no material casualty losses were incurred.  Stock compensation  All share-based payments to employees, including grants of employee stock options, are recognized as stock compensation in the Company’s income statement based on their grant date fair values. See Note 1 1 .  Revenue and expense recognition  The Company must meet four basic criteria before revenue can be recognized: persuasive evidence of an arrangement exists; the delivery has occurred or services have been rendered; the fee is fixed or determinable; and collectability is reasonably assured. All leases are classified as operating leases. Rental income is recognized on a straight-line basis over the terms of the leases. Straight-line rent is recognized for all tenants with contractual fixed increases in rent that are not included on the Company’s credit watch list. Deferred rent receivable represents rental revenue recognized on a straight-line basis in excess of billed rents. Reimbursements from tenants for real estate taxes and other recoverable operating expenses are recognized as rental income in the period the applicable costs are incurred. Property management fees are recognized in the period earned.  Costs incurred in connection with leasing (primarily tenant improvements and lease commissions) are capitalized and amortized over the lease period.  Gains from sales of real estate facilities  The Company recognizes gains from sales of real estate facilities at the time of sale using the full accrual method, provided that various criteria related to the terms of the transactions and any subsequent involvement by the Company with the properties sold are met. If the criteria are not met, the Company defers the gains and recognizes them when the criteria are met or uses the installment or cost recovery methods as appropriate under the circumstances.  General and administrative expenses  General and administrative expenses include executive and other compensation, office expenses, professional fees, acquisition transaction costs, state income taxes and other such administrative items.  Income taxes  The Company has qualified and intends to continue to qualify as a REIT, as defined in Section 856 of the Internal Revenue Code of 1986, as amended. As a REIT, the Company is not subject to federal income tax to the extent that it distributes its REIT taxable income to its shareholders. A REIT must distribute at least 90 % of its REIT taxable income each year. In addition, REITs are subject to a number of organizational and operating requirements. The Company may be subject to certain state and local taxes on its income and property and to federal income and excise taxes on its undistributed taxable income. The Company believes it met all organization and operating requirements to maintain its REIT status during 2016 , 2015 and 2014 and intends to continue to meet such requirements. Accordingly, no provision for income taxes has been made in the accompanying consolidated financial statements.  The Company can recognize a tax benefit only if it is “more likely than not” that a particular tax position will be sustained upon examination or audit. To the extent that the “more likely than not” standard has been satisfied, the benefit associated with a position is measured as the largest amount that is greater than 50 % likely of being recognized upon settlement. As of December 31, 2016 , the Company did not recognize any tax benefit for uncertain tax positions. Accounting for preferred equity issuance costs  The Company records issuance costs as a reduction to paid-in capital on its balance sheet at the time the preferred securities are issued and reflects the carrying value of the preferred equity at the stated value. Such issuance costs are recorded as non-cash preferred equity distributions at the time the Company notifies the holders of preferred stock of its intent to redeem such shares.  Net income allocation  Net income was allocated as follows for the years ended December 31, (in thousands) :     2016 2015 2014  Net income allocable to noncontrolling interests:  Noncontrolling interests — common units $ 16,955 $ 18,495 $ 30,729  Total net income allocable to noncontrolling interests 16,955 18,495 30,729  Net income allocable to PS Business Parks, Inc.:  Preferred shareholders  Distributions to preferred shareholders 57,276 59,398 60,488  Non-cash distributions related to the redemption of  preferred stock 7,312 2,487 —  Total net income allocable to preferred shareholders 64,588 61,885 60,488  Restricted stock unit holders 569 299 329  Common shareholders 62,872 68,291 113,154  Total net income allocable to PS Business Parks, Inc. 128,029 130,475 173,971  Net income $ 144,984 $ 148,970 $ 204,700  Net income per common share  Per share amounts are computed using the number of weighted average common shares outstanding. “Diluted” weighted average common shares outstanding includes the dilutive effect of stock options and restricted stock units under the treasury stock method. “Basic” weighted average common shares outstanding excludes such effect. The Company's restricted stock units are participating securities and are included in the computation of basic and diluted weighted average common shares outstanding. The Company’s restricted stock unit holders are paid non-forfeitable dividends in excess of the expense recorded which results in a reduction in net income allocable to common shareholders and unit holders.  Earnings per share has been calculated as follows for the years ended December 31, (in thousands, except per share amounts):     2016 2015 2014  Net income allocable to common shareholders $ 62,872 $ 68,291 $ 113,154  Weighted average common shares outstanding:  Basic weighted average common shares outstanding 27,089 26,973 26,899  Net effect of dilutive stock compensation — based on  treasury stock method using average market price 90 78 101  Diluted weighted average common shares outstanding 27,179 27,051 27,000  Net income per common share — Basic $ 2.32 $ 2.53 $ 4.21  Net income per common share — Diluted $ 2.31 $ 2.52 $ 4.19  Options to purchase 25,000 , 32,000 and 16,000 shares for the years ended December 31, 2016 , 2015 and 2014 , respectively, were not included in the computation of diluted net income per share because such options were considered anti-dilutive. Segment reporting  The Company views its operations as one segment.  Reclassifications  Certain reclassifications have been made to the consolidated financial statements for 2015 and 2014 in order to conform to the 2016 presentation.  Recently issued accounting standards  In May, 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers, which amended the existing accounting standards for revenue recognition. The core principle underlying this guidance is that entities will recognize revenue upon the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled for such exchange. The guidance also provides a model for the measurement and recognition of gains and losses on the sale of certain nonfinancial assets, such as property and equipment, including real estate. This guidance is currently effective for the Company’s fiscal year beginning January 1, 2018. Early adoption is permitted for the Company’s fiscal year beginning January 1, 2017. ASU 2014-09 allows for full retrospective adoption applied to all periods presented or modified retrospective adoption with the cumulative effect of initially applying the standard recognized at the date of initial application. The Company intends to adopt the guidance using the modified retrospective approach for the fiscal year beginning January 1, 2018. The Company anticipates no impact upon adoption of the new accounting guidance on its consolidated financial statements relating to the Company’s facility management fees for property management services provided to PS or the recognition of gains and losses on the sale of real estate assets as the Company’s current acco unting for such transactions is consistent with the new guidance’s core principle. Rental income from leasing arrangements are a substantial portion of the Company’s revenue and is specifically excluded from ASU 2014-09 and will be governed by the applicable lease codification (ASU 2016-02, Leases) . In conjunction with the adoption of the leasing guidance, the Company is currently in the process of evaluating certain variable payment terms included in these lease arrangements which are governed by ASU 2014-09.  In February, 2016, the FASB issued ASU 2016-02, Leases , which amends the existing accounting standards for lease accounting. The accounting applied by a lessor is largely unchanged under this guidance. However, the guidance requires lessees to classify leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee. The classification will determine whether the lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. A lessee is al so required to record a right-of-use asset and related liability for most leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating leases today. The new guidance is expected to result in the recognition of a right-of -use asset and related liability to account for our future obligations under our ground lease arrangements for which we are the lessee. As of December 31, 2016, the remaining contractual payments under our ground lease agreements aggregated $381,000 . Additionally, the new guidance will require that lessees and lessors capitalize, as initial direct costs, only those costs that are incurred due to the execution of a lease. This guidance is effective for annual periods beginning after December 15, 2018 and interim periods within annual periods beginning after December 15, 2018. Early adoption is permitted. The guidance must be adopted using a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. The Company is currently in the process of evaluating the impact of adoption of the new accounting guidance on its consolidated financial statements.  In August, 2014, the FASB issued ASU 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern , which is intended to define management’s responsibility to evaluate whether there is substantial doubt about an organization’s ability to continue as a going concern for a period of one year after the date that the financial statements are issued. This guidance is effective for annual periods ending after December 15, 2016 and interim periods within annual periods beginning after December 15, 2016. The Company adopted the new guidance during the fourth quarter of 2016 and the adoption did not require any disclosures about the Company’s ability to continue as a going concern.  In February, 2015, the FASB issued ASU 2015-02, Consolidation – Amendments to the Consolidation Analysis , which amended the existing accounting standards for consolidation under both the variable interest model and the voting model. On January 1, 2016, the Company adopted this guidance and as the Operating Partnership is already consolidated in the balance sheets of the Company, the identification of this entity as a VIE has no impact on the consolidated financial statements of the Company. Additionally, the Company’s accounting for its investment in its joint venture was not impacted by the adoption of this guidance.  In March, 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting , to amend the accounting guidance for share-based payment accounting. The Company early adopted this standard effective October 1, 2016. Under this standard, a share-based payment related to the tax liability paid on behalf of employees in lieu of shares received is classified as a financing activity on the statement of cash flows, rather than as an operating activity as the Company had previously presented such amounts. The Company applied this provision retrospectively. On our consolidated statement s of cash flows for the years ended Decemb er 31, 2015 and 2014, the Company reclassified $ 767,000 and $ 409,000 , respectively, for share-based payment s related to tax liability paid on behalf of employees in lieu of shares received upon vesting of restricted stock units as a reduction from financing activities. The Company previously reflected these amounts as a reduction from operating activities. The standard also allows an employer to make a policy election to account for forfeitures of share-based payments as they occur or estimate forfeitures and adjust the estimate when it is likely to change, as is currently required. The Company elected to recognize forfeitures of share-based payments as they occur, rather than estimating them in advance, effective October 1, 2016, under the modified retrospective transition method. The Company recorded a cumulative-effect adjustment of $807,000 to decrease cumulative net income and increase paid-in capital as of October 1, 2016, representing the impact of estimated forfeitures on our cumulative share-based compensation expense recorded through September 30, 2016. See Note 11.

Real Estate Facilities

Real Estate Facilities	12 Months Ended
	Dec. 31, 2016
Real Estate Facilities [Abstract]
Real Estate Facilities	 3. Real estate facilities  The activity in real estate facilities for the years ended December 31, 2016 , 2015 and 2014 is as follows (in thousands) :     Buildings and Accumulated  Land Improvements Depreciation Total  Balances at December 31, 2013 $ 772,161 $ 2,115,987 $ (896,189) $ 1,991,959  Acquisition of real estate facilities 21,408 24,890 — 46,298  Capital expenditures — 54,462 — 54,462  Disposals — (10,587) 10,587 —  Depreciation and amortization — — (110,357) (110,357)  Transfer to properties sold — (1,759) 4,462 2,703  Balances at December 31, 2014 793,569 2,182,993 (991,497) 1,985,065  Capital expenditures — 46,777 — 46,777  Disposals — (13,990) 13,990 —  Depreciation and amortization — — (105,394) (105,394)  Transfer to properties sold — (265) 298 33  Balances at December 31, 2015 793,569 2,215,515 (1,082,603) 1,926,481  Acquisition of real estate facilities 5,638 7,637 — 13,275  Capital expenditures — 37,232 — 37,232  Disposals — (14,411) 14,411 —  Depreciation and amortization — — (99,486) (99,486)  Transfer to land and building held for development (9,676) (19,092) 7,870 (20,898)  Balances at December 31, 2016 $ 789,531 $ 2,226,881 $ (1,159,808) $ 1,856,604   The unaudited basis of real estate facilities for federal income tax purposes was approximately $1. 9 billion at December 31, 2016 .  The purchase price of acquired properties is recorded to land, buildings and improvements (including tenant improvements, unamortized lease commissions, acquired in-place lease values, and tenant relationships, if any) and intangible assets and liabilities associated with the value of above-market and below-market leases based on their respective estimated fair values. Acquisition-related costs are expensed as incurred.  In determining the fair value of the tangible assets of the acquired properties, management considers the value of the properties as if vacant as of the acquisition date. Management must make significant assumptions in determining the value of assets acquired and liabilities assumed. Using different assumptions in the recording of the purchase cost of the acquired properties would affect the timing of recognition of the related revenue and expenses. Amounts recorded to land are derived from comparable sales of land within the same region. Amounts recorded to buildings and improvements, tenant improvements and unamortized lease commissions are based on current market replacement costs and other market information. The amount recorded to acquired in-place leases is determined based on management’s assessment of current market conditions and the estimated lease-up periods for the respective spaces.  On September 28, 2016 , the Company acquired two multi-tenant office buildings aggregating 226,000 square feet in Rockville, Maryland, for a purchase price of $13.3 million. The buildings are located within Shady Grove Executive Park, where the Company owns three other buildings aggregating 352,000 square feet. The Company incurred and expensed acquisition transaction costs of $328,000 for the year ended December 31, 2016.  On December 30, 2014 , the Company acquired Charcot Business Park II, an eight -building, 119,000 square foot multi-tenant flex park in San Jose, California, for $ 16.0 million. The park is contiguous to the Company’s existing 164,000 square foot Charcot Business Park. On November 3, 2014 , the Company acquired a 246,000 square foot multi-tenant industrial building in Austin, Texas, for a purchase price of $ 10.6 million. On August 21, 2014 , the Company acquired a 145,000 square foot multi-tenant flex park consisting of six single-story buildings located in Dallas, Texas, for a purchase price of $ 5.1 million. On July 28, 2014 , the Company acquired a 19,000 square foot building in Dallas, Texas, for $ 1.1 million. The flex building is located in the Company’s 389,000 square foot Arapaho Business Park. On July 24, 2014 , the Company acquired a 149,000 square foot building in Miami, Florida, for $ 12.7 million. The building is located within the Company’s 3.3 million square foot Miami Industrial Commerce Center. The Company incurred and expensed acquisition transaction costs of $ 350,000 for the year ended December 31, 2014.  The Company did no t acquire any assets or assume any liabilities during the year ended December 31, 2015.  The following table summarizes the assets acquired and liabilities assumed for the years ended December 31, (in thousands) :     2016 2015 2014  Land $ 5,638 $ — $ 21,408  Buildings and improvements 7,637 — 24,890  Below-market in-place lease value (25) — (666)  Total purchase price 13,250 — 45,632  Net operating assets acquired and liabilities assumed (622) — (611)  Total cash paid $ 12,628 $ — $ 45,021  As of November 1, 2016, the Company transferred a 123,000 square foot building located within The Mile in Tysons, Virginia to land and building held for development , as the Company is pursuing entitlements to develop an additional multi-family complex on this site. The scope and timing of any future development will be subject to a variety of approvals and contingencies. Prior to being classified as land and building held for development, the building was occupied by a single user.  During 2015, the Company sold four business parks, aggregating 492,000 square feet, in non-strategic markets for net proceeds of $41.2 million, which resulted in a gain of $23.4 million. Additionally, as part of an eminent domain process, the Company sold five buildings, aggregating 82,000 square feet, at the Company’s Overlake Business Park located in Redmond, Washington, for $13.9 million, which resulted in a gain of $4.8 million. During 2014, the Company sold five business parks aggregating 1.9 million square feet and 11.5 acres of land in non-strategic markets, including Portland, Oregon and Phoenix, Arizona, for net proceeds of $212.2 million, which resulted in a gain of $92.4 million. With these sales the Company has completed its stated objective of exiting non-strategic markets in Sacramento, California, Oregon and Arizona. 

Investment In And Advances To U

Investment In And Advances To Unconsolidated Joint Venture	12 Months Ended
	Dec. 31, 2016
Investment In And Advances To Unconsolidated Joint Venture [Abstract]
Investment In And Advances To Unconsolidated Joint Venture	4 . Investment in and advances to unconsolidated joint venture  In 2013, the Company entered into a joint venture known as Amherst JV LLC (the “Joint Venture”) with an unrelated real estate development company (the “JV Partner”) for the purpose of developing a 395 -unit multi-family building on a five -acre site within The Mile in Tysons, Virginia (the “Project”). PSB holds a 95.0% interest in the Joint Venture with the remaining 5.0% held by the JV Partner. The JV Partner is responsible for the development and construction of the Project and through an affiliate will oversee the leasing and management of the Project as it is completed. The Project is expected to deliver its first completed units in the spring of 2017, with final completion of the Project expected in early 2018.  On October 5, 2015 (the “Contribution Date”), the Company contributed the site, along with capitalized improvements, to the Joint Venture. Subsequent to the Contribution date, demolition, site preparation and construction commenced. The JV partner serves as the managing member, with mutual consent from both the Company and the managing member required for all significant decisions. As such, the Company accounts for its investment in the Joint Venture using the equity method. Along with the equity capital the Company has committed to the Joint Venture, the Company has also agreed to provide the Joint Venture with a construction loan in the amount of $75.0 million. The Joint Venture will pay interest under the construction loan at a rate equal to the London Interbank Offered Rate (“LIBOR”) plus 2.25% . The loan will mature on April 5, 2019 with two one -year extension options . The Company has reflected the aggregate value of the contributed site, its’ equity contributions, capitalized interest and loan advances to date as investment in and advances to unconsolidated joint venture. The aggregate amount of development costs are estimated to be $105.6 million (excluding unrealized land appreciation), of which the Company is committed to funding $75.0 million through a construction loan in addition to capital contributions of $28.5 million , which includes a land basis of $15.3 million, to the Joint Venture.  The Company’s investment in and advances to unconsolidated joint venture was $ 67.2 million and $ 26.7 million at December 31, 2016 and 2015, respectively . For the year ended December 31, 2016, the Company made loan advances of $33.9 million, capital contributions of $5.7 million and capitalized $885,000 of interest.  Prior to Contribution Date, the Company capitalized $2.8 million to the Project , of which $813,000 was related to capitalized interest f r om January 1, 2015 through October 5, 2015 . Subsequent to the Contribution Date, the Company made cash contributions of $5.2 million and capitalized $346,000 of interest on its investment in the Joint Venture from October 6, 2015 through December 31, 2015. The Company made no loan advances to the Joint Venture in 2015 .  At December 31, 2014, the land and capitalized development costs were $18.4 million for the Project. For the year ended December 31, 2014, the Company capitalized $2.2 million to the Project, of which $944,000 was related to capitalized interest.

Leasing Activity

Leasing Activity	12 Months Ended
	Dec. 31, 2016
Leasing Activity [Abstract]
Leasing Activity	 5 . Leasing activity  The Company leases space in its real estate facilities to tenants primarily under non-cancelable leases generally ranging from one to 10 years. Future minimum rental revenues, excluding recovery of operating expenses under these leases, are as follows as of December 31, 2016 (in thousands) :     2017 $ 274,275  2018 211,707  2019 145,187  2020 94,697  2021 63,185  Thereafter 114,628  Total $ 903,679  In addition to minimum rental payments, certain tenants reimburse the Company for their pro rata share of specified operating expenses. Such reimbursements amounted to $ 82.6 million, $ 78. 9 million and $80. 7 million for the years ended December 31, 2016 , 2015 and 2014 , respectively. These amounts are included as rental income in the accompanying consolidated statements of income.  Leases accounting for 3.6 % of total leased square footage are subject to termination options, of which 2.3 % of total leased square footage have termination options exercisable through December 31, 2017 (unaudited). In general, these leases provide for termination payments should the termination options be exercised. The future minimum rental revenues in the above table assume such options are not exercised.

Bank Loans

Bank Loans	12 Months Ended
	Dec. 31, 2016
Bank Loans [Abstract]
Bank Loans	6 . Bank loans  The Company has a line of credit (the “Credit Facility”) with Wells Fargo Bank, Natio nal Association (“Wells Fargo”) with a borrowing limit of $ 250.0 million . Subsequent to December 31, 2016, the Company modified and extended the terms of its Credit Facility and the Company’s related guaranty. The expiration date was extended from May 1, 2019 to January 10 , 2022 . The rate of interest charged on borrowings was modified to a rate ranging from the LIBOR plus 0.80% to LIBOR plus 1.55% , depending on the Company’s credit ratings. Currently, the Company’s rate under the Credit Facility is LIBOR plus 0.825% , down from the previous rate of 0.875% . In addition, the Company is required to pay an annual facility fee ranging from 0.1 0 % to 0.30 % of the borrowing limit depending on the Company’s credit ratings (currently 0.1 25 %). The Company had no balance outstanding on the Credit Facility at December 31, 2016 and 2015 . Subsequent to December 31, 2016, the Company had $ 85.0 million outstanding on the Credit Facility in conjunction to the redemption of its 6.45% Cumulative Preferred Stock, Series S. The Company had $ 539,000 and $ 769,000 of unamortized commitment fees as of December 31, 2016 and 2015 , respectively , which is included in other assets in the accompanying consolidated balance sheets . The Credit Facility requires the Company to meet certain covenants, all of which the Company was in compliance with at December 31, 2016 . Interest on outstanding borrowings is payable monthly . 

Mortgage Note Payable

Mortgage Note Payable	12 Months Ended
	Dec. 31, 2016
Mortgage Note Payable [Abstract]
Mortgage Note Payable	7 . Mortgage note payable  On June 1, 2016 , the Company repaid in full the $250.0 million mortgage note which had a fixed interest rate of 5.45% .

Noncontrolling Interests

Noncontrolling Interests	12 Months Ended
	Dec. 31, 2016
Noncontrolling Interests [Abstract]
Noncontrolling Interests	 8 . Noncontrolling interests  As described in Note 2, the Company reports noncontrolling interests within equity in the consolidated financial statements, but separate from the Company’s shareholders’ equity. In addition, net income allocable to noncontrolling interests is shown as a reduction from net income in calculating net income allocable to common shareholders.  Common partnership units  The Company presents the accounts of PSB and the Operating Partnership on a consolidated basis. Ownership interests in the Operating Partnership that can be redeemed for common stock, other than PSB’s interest, are classified as noncontrolling interests — common units in the consolidated financial statements. Net income allocable to noncontrolling interests — common units consists of the common units’ share of the consolidated operating results after allocation to preferred units and shares. Beginning one year from the date of admission as a limited partner (common units) and subject to certain limitations described below, each limited partner other than PSB has the right to require the redemption of its partnership interest.  A limited partner (common units) that exercises its redemption right will receive cash from the Operating Partnership in an amount equal to the market value (as defined in the Operating Partnership Agreement) of the partnership interests redeemed. In lieu of the Operating Partnership redeeming the common units for cash, PSB, as general partner, has the right to elect to acquire the partnership interest directly from a limited partner exercising its redemption right, in exchange for cash in the amount specified above or by issuance of one share of PSB common stock for each unit of limited partnership interest redeemed.  A limited partner (common units) cannot exercise its redemption right if delivery of shares of PSB common stock would be prohibited under the applicable articles of incorporation, or if the general partner believes that there is a risk that delivery of shares of common stock would cause the general partner to no longer qualify as a REIT, would cause a violation of the applicable securities laws, or would result in the Operating Partnership no longer being treated as a partnership for federal income tax purposes.  On December 30, 2014, the Company paid a one-time special cash dividend of $ 2.75 per share along with the fourth quarter regular dividend of $ 0.50 per share. Holders of the common partnership units received the same distribution.  At December 31, 2016 , there were 7,305,355 common units owned by PS, which are accounted for as noncontrolling interests. Combined with PS’s existing common stock ownership, on a fully converted basis, PS has a combined ownership of 42.0 % (or 14.5 million shares) of the Company’s common equity.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2016
Related Party Transactions [Abstract]
Related Party Transactions	9 . Related party transactions  The Operating Partnership manages industrial, office and retail facilities for PS. These facilities, all located in the United States, operate under the “Public Storage” or “PS Business Parks” names. The PS Business Parks name and logo are owned by PS and licensed to the Company under a non-exclusive, royalty-free license agreement. The license can be terminated by either party for any reason with six months written notice.  Under the property management contract with PS, the Operating Partnership is compensated based on a percentage of the gross revenues of the facilities managed. Under the supervision of the property owners, the Operating Partnership coordinates rental policies, rent collections, marketing activities, the purchase of equipment and supplies, maintenance activities, and the selection and engagement of vendors, suppliers and independent contractors. In addition, the Operating Partnership assists and advises the property owners in establishing policies for the hire, discharge and supervision of employees for the operation of these facilities, including property managers and leasing, billing and maintenance personnel.  The property management contract with PS is for a seven -year term with the agreement automatically extending for an additional one -year period upon each one-year anniversary of its commencement (unless cancelled by either party). Either party can give notice of its intent to cancel the agreement upon expiration of its current term. Management fee revenues under this contract were $ 518,000 , $540,000 and $660,000 for the years ended December 31, 2016 , 2015 and 2014 , respectively.  PS also provides property management services for the self-storage component of two assets owned by the Company. These self-storage facilities, located in Palm Beach County, Florida, operate under the “Public Storage” name.  Under the property management contract, PS is compensated based on a percentage of the gross revenues of th e facilities managed. Under the supervision of the Company, PS coordinates rental policies, rent collections, marketing activities, the purchase of equipment and supplies, maintenance activities, and the selection and engagement of vendors, suppliers and independent contractors. In addition, PS is responsible for establishing the policies for the hire, discharge and supervision of employees for the operation of these facilities, including on-site managers, assistant managers and associate managers.  Either the Company or PS can cancel the property management contract upon 60 days’ notice. Management fee expenses under the contract were $ 86,000 , $ 79,000 and $ 70,000 for the years ended December 31, 2016 , 2015 and 2014 , respectively.  Pursuant to a cost sharing and administrative services agreement, the Company shares costs with PS for certain administrative services and rental of corporate office space, which are allocated between the Company and PS in accordance with a methodology intended to fairly allocate those costs. C osts allocated to the Company totaled $493,000 , $469,000 and $451,000 for the years ended December 31, 2016 , 2015 and 2014 , respectively. Costs allocated to PS totaled $38,000 for the year ended December 31, 2016.  The Company had net amounts due from PS of $ 295,000 and $57,000 at December 31, 2016 and 2015 , respectively, for these contracts, as well as for certain operating expenses paid by the Company on behalf of PS.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2016
Shareholders' Equity [Abstract]
Shareholders' Equity	10 . Shareholders’ equity  Preferred stock  As of December 31, 2016 and 2015 , the Company had the following series of preferred stock outstanding:     December 31, 2016 December 31, 2015  Earliest Potential Dividend Shares Amount Shares Amount  Series Issuance Date Redemption Date Rate Outstanding (in thousands) Outstanding (in thousands)  Series T May, 2012 May, 2017 6.000% 14,000 $ 350,000 14,000 $ 350,000  Series U September, 2012 September, 2017 5.750% 9,200 230,000 9,200 230,000  Series V March, 2013 March, 2018 5.700% 4,400 110,000 4,400 110,000  Series W October, 2016 October, 2021 5.200% 7,590 189,750 — —  Series S January, 2012 January, 2017 6.450% — — 9,200 230,000  Total 35,190 $ 879,750 36,800 $ 920,000  On December 7, 2016 , the Company called for the redemption of its 6.45% Cumulative Preferred Stock, Series S, at its par value of $230.0 million and subsequently completed the redemption on January 18, 2017. The Company reported non-cash distributions of $7.3 million, representing the original issuance costs, as a reduction of net income allocable to common shareholders and unit holders for the year ended December 31, 2016. As of December 31, 2016, the Company reclassified the 6.45% Cumulative Preferred Stock, Series S, of $230.0 million from equity to liabilities as preferred stock called for redemption.  On October 20, 2016, the Company issued $189.8 million or 7,590,000 depositary shares, each representing 1/1 ,000 of a share of the 5.20% Cumulative Preferred Stock, Series W, at $25.00 per depositary share. The 5.20% Series W Cumulative Redeemable Preferred Units are non-callable for five years and have no mandatory redemption.  On October 15, 2015, the Company completed the redemption of its 6.875% Cumulative Preferred Stock, Series R, at its par value of $75.0 million. The Company reported non-cash distributions of $2.5 million, representing the original issuance costs, as a reduction of net income allocable to common shareholders and unit holders for the year ended December 31, 2015.  The Company recorded $64. 6 million, $61.9 million and $60.5 million in distributions to its preferred shareholders for the years ended December 31, 2016 , 2015 and 2014 , respectively.  Holders of the Company’s preferred stock will not be entitled to vote on most matters, except under certain conditions. In the event of a cumulative arrearage equal to six quarterly dividends, the holders of the preferred stock will have the right to elect two additional members to serve on the Company’s Board of Directors (the “Board”) until all events of default have been cured. At December 31, 2016 , there were no dividends in arrears.  Except under certain conditions relating to the Company’s qualification as a REIT, the preferred stock is not redeemable prior to the previously noted redemption dates. On or after the respective redemption dates, the respective series of preferred stock will be redeemable, at the option of the Company, in whole or in part, at $ 25.00 per depositary share, plus any accrued and unpaid dividends. The Company had $28.4 million and $ 29.3 million of deferred costs in connection with the issuance of preferred stock as of December 31, 2016 and 2015 , respectively, which the Company will report as additional non-cash distributions upon notice of its intent to redeem such shares.  Common stock  Subsequent to December 31, 2016, the Board increased its quarterly dividend from $0. 75 per common share to $0.85 per common share, increasing quarterly distributions by $3. 4 million per quarter.  During the three months ended March 31, 2016, the Board increased its quarterly dividend from $0.60 per common share to $0.75 per common share. During the three months ended September 30, 2015, the Board increased its quarterly dividend from $0.50 per common share to $0.60 per common share.  Dividends declared for the three months ended December 31, 2014 included a one-time special cash dividend of $ 2.75 per share (the “Special Cash Dividend”) along with the fourth quarter regular dividend of $ 0.50 per share. The Special Cash Dividend was declared to distribute a portion of the excess income attributable to gains on sales from asset dispositions during 2014, as discussed in Note 3 .  The Company paid $81.3 million ($ 3. 00 per common share), $59.4 million ($ 2.20 per common share) and $127.8 million ($ 4.75 per common share) in distributions to its common shareholders for the years ended December 31, 2016 , 2015 and 2014 , respectively. The portion of the distributions classified as ordinary income was 100.0% , 89.4% and 70.5% for the years ended December 31, 2016 , 2015 and 2014 , respectively. The portion of the distributions classified as long-term capital gain income was 0.0% , 10.6% and 29.5% for the years ended December 31, 2016 , 2015 and 2014 , respectively. The percentages in the two preceding sentences are unaudited.  No shares of common stock were repurchased under the board approved common stock repurchase program during the years ended December 31, 2016 , 2015 and 2014 .  Equity stock  In addition to common and preferred stock, the Company is authorized to issue 100.0 million shares of Equity Stock. The Articles of Incorporation provide that Equity Stock may be issued from time to time in one or more series and give the Board broad authority to fix the dividend and distribution rights, conversion and voting rights, redemption provisions and liquidation rights of each series of Equity Stock.

Stock Compensation

Stock Compensation	12 Months Ended
	Dec. 31, 2016
Stock Compensation [Abstract]
Stock Compensation	11. Stock compensation  PSB has a 2003 Stock Option and Incentive Plan (the “2003 Plan”) and a 2012 Equity and Performance-Based Incentive Compensation Plan (the “2012 Plan”) covering 1.5 million and 1.0 million shares of PSB’s common stock, respectively. Under the 2003 Plan and 2012 Plan, PSB has granted non-qualified options to certain directors, officers and key employees to purchase shares of PSB’s common stock at a price not less than the fair market value of the common stock at the date of grant. Additionally, under the 2003 Plan and 2012 Plan, PSB has granted restricted shares of common stock to certain directors and restricted stock units to officers and key employees.  Options under the 2003 Plan and 2012 Plan vest over a five -year period from the date of grant at the rate of one fifth per year and expire 10 years after the date of grant. Restricted stock units granted prior to 2016 are subject to a six -year vesting , none in year one and 20% for each of the next five years. Restricted stock units granted during 2016 are subject to a five -year vesting at the rate of 20% per year. The grantee of restricted stock units receives dividend equivalents for each outstanding award equal to the per-share dividends received by common shareholders and are recorded in additional paid-in capital. The Company expenses any dividend equivalents previously paid upon forfeiture of the related unvested restricted stock unit. Upon vesting, the grantee receives common shares equal to the number of vested awards, less common shares withheld in exchange for tax deposits made by the Company to satisfy the grantee’s statutory tax liabilities arising from the vesting.  As noted under “Recently issued accounting standards” in Note 2, the Company elected to early adopt ASU 2016-09, Improvements to Employee Share-Based Payment Accounting, and account for forfeitures of share-based payments as they occur. Accordingly , compensation cost previously recognized for an award that is forfeited because of a failure to satisfy a service or performance condition will be reversed in the period of the forfeiture. This election wa s made using a modified retrospective approach, with a cumulative-effect adjustment of $807,000 to decrease cumulative net income and increase paid-in capital representing the impact of estimated forfeitures on cumulative share-based compensation expense recorded through September 30, 2016 . The Company did not record any reserves on share-based compensation expense for the three months ended December 31, 2016.  The weighted average grant date fair value of options granted during the years ended December 31, 2016 , 2015 and 2014 was $ 9.05 per share, $ 8.49 per share and $ 10.95 per share, respectively. The Company has calculated the fair value of each option grant on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions used for grants during the years ended December 31, 2016 , 2015 and 2014 , respectively: a dividend yield of 2. 9 %, 2. 5 % and 2. 3 %; expected volatility of 15 .5 %, 1 6.1 % and 17. 7 %; expected life of five years; and risk-free interest rates of 1. 1 %, 1. 4 % and 1. 7 %. The weighted average grant date fair value of restricted stock units granted during the years ended December 31, 2016 , 2015 and 2014 was $ 8 7.45 , $ 8 2.78 and $ 81.47 , r espectively . The Company calculated the fair value of each restricted stock unit grant using the market value on the date of grant.  At December 31, 2016 , there was a combined total of 1. 2 million options and restricted stock units authorized to be granted.  In connection with the 2014 Special Cash Dividend discussed in Note 10, the number of options and exercise prices of all outstanding options as of December 31, 2014 were adjusted pursuant to the anti-dilution provisions of the applicable plans so that the option holders would be neither advantaged nor disadvantaged as a result of the Special Cash Dividend.  Information with respect to outstanding options and nonvested restricted stock units granted under the 2003 Plan and 2012 Plan is as follows :    Weighted Aggregate  Weighted Average Intrinsic  Number of Average Remaining Value  Options: Options Exercise Price Contract Life (in thousands)  Outstanding at December 31, 2013 380,773 $ 56.45  Granted 16,000 $ 82.84  Exercised (61,273) $ 49.84  Forfeited (4,000) $ 52.35  Special cash dividend adjustment (1) 10,352 $ N/A  Outstanding at December 31, 2014 341,852 $ 57.11  Granted 16,000 $ 80.13  Exercised (99,178) $ 51.31  Forfeited — $ —  Outstanding at December 31, 2015 258,674 $ 60.76  Granted 39,000 $ 102.58  Exercised (68,019) $ 57.17  Forfeited — $ —  Outstanding at December 31, 2016 229,655 $ 68.93 5.35 Years $ 10,930  Exercisable at December 31, 2016 153,432 $ 58.63 3.92 Years $ 8,882 ____________  (1) In accordance with the applicable equity award plan documents, the number and exercise price of outstanding options as of December 31, 2014 have been adjusted as a result of the Special Cash Dividend so that the option holder maintains their economic position with respect to the shareholders.      Weighted  Number of Average Grant  Restricted Stock Units: Units Date Fair Value  Nonvested at December 31, 2013 45,100 $ 60.07  Granted 6,800 $ 81.47  Vested (12,980) $ 53.65  Forfeited (3,750) $ 69.00  Nonvested at December 31, 2014 35,170 $ 65.62  Granted 75,606 $ 82.78  Vested (25,384) $ 74.19  Forfeited (6,740) $ 76.22  Nonvested at December 31, 2015 78,652 $ 78.44  Granted 119,950 $ 87.45  Vested (47,779) $ 80.45  Forfeited (6,130) $ 76.51  Nonvested at December 31, 2016 144,693 $ 58.56 Effective March, 2014, the Company entered into a performance-based restricted stock unit program, the Senior Management Long-Term Equity Incenti ve Program for 2014-2017 (“ LTEIP”), with certain employees of the Company. Under the LTEIP, the Company established three levels of targeted restricted stock unit awards for certain employees, which would be earned only if the Company achieved one of three defined targets duri ng 2014 to 2017. Under the LTEIP there is an annual award following the end of each of the four years in the program, with the award subject to and based on the achievement of total return targets during the previous year, as well as an award based on achieving total return targets during the cumulative four-year period 2014-2017. In the event the minimum defined target is not achieved for an annual award, the restricted stock units allocated to be awarded for such year are added to the restricted stock units that may be received if the four-year target is achieved. All restricted s tock unit awards under the LTEIP vest in four equal annual installments beginning from the date of award. Up to 99,150 restricted stock units would be awarded for each of the four years assuming achievement was met and up to 92,900 restricted stock units would be awarded for the cumulative four-year period assuming achievement was met. Compensation expense is recognized based on the restricted stock units expected to be awarded based on the target level that is expected to be achieved . Net compensation expense of $9. 8 million, $ 8. 2 million and $7.4 million related to the LTEIP was recognized for the years ended December 31, 2016 , 2015 and 2014 , respectively. Included in the 2016 amount, the Company recorded a net non-cash stock compensation charge of $2.0 million related to a change in senior management and the future issuance of restricted stock units our former Chief Executive Officer will receive under the Company’s LTEIP.  In connection with the LTEIP, targets for 2014 and 2015 were achieved at the threshold total return level. As such, 99,150 and 66,506 restricted stock units were granted during the years ended December 31, 2016 and 2015, respectively, at a weighted average grant date fair value of $ 83.59 and $8 3.47 , respectively .  Included in the Company’s consolidated statements of income for the years ended December 31, 2016 , 2015 and 2014 , was $282,000 , $261,000 and $ 1.1 million, respectively, in net compensation expense related to stock options. Included in the 2014 compensation expense relating to stock options was $ 644,000 of expense resulting from modifications made to outstanding stock options as a result of the Special Cash Dividend paid in Dec ember, 2014. Net compensation expense of $10.3 million, $8.7 million and $8.0 million related to restricted stock units was recognized during the years ended December 31, 2016, 2015 and 2014, respectively.  As of December 31, 2016 , there was $ 566,000 of unamortized compensation expense related to stock options expected to be recognized over a weighted average period of 3. 5 years. As of December 31, 2016 , there was $ 12.6 million of unamortized compensation expense related to restricted stock units expected to be recognized over a weighted average period of 3. 7 years.  Cash received from 68,019 stock options exercised during the year ended December 31, 2016 was $3.9 million. Cash received from 99,178 stock options exercised during the year ended December 31, 2015 was $ 5 . 1 million. Cash received from 61,273 stock options exercised during the year ended December 31, 2014 was $3.1 million. The aggregate intrinsic value of the stock options exercised was $ 3. 4 million, $ 2. 6 million and $ 2. 1 million during the years ended December 31, 2016 , 2015 and 2014 , respectively.  During the year ended December 31, 2016 , 47,779 restricted stock units vested; in settlement of these units, 28,046 shares were issued , net of 19,733 shares applied to payroll taxes. The aggregate fair value of the shares vested for the year ended December 31, 2016 was $ 4.7 million. During the year ended December 31, 2015 , 25,384 restricted stock units vested; in settlement of these units, 15,734 shares were issued, net of 9,650 shares applied to payroll taxes. The aggregate fair value of the shares vested for the year ended December 31, 2015 was $ 2.0 million. During the year ended December 31, 2014 , 12,980 restricted stock units vested; in settlement of these units, 8, 066 shares were issued, net of 4,914 shares applied to payroll taxes. The aggregate fair value of the shares vested for the year ended December 31, 2014 was $ 1. 1 million. In addition to the vesting of these shares, tax deposits totaling $1.9 million, $767,000 and $409,000 were made during the years ended December 31, 2016, 2015 and 2014 , respectively, on behalf of employees in exchange for common shares withheld upon vesting.  In April, 2015, the shareholders of the Compan y approved the issuance of up to 130,000 shares of common stock under the Retirement Plan for Non-Employee Directors (the “Director Plan”). Under the Director Plan, the Company grants 1,000 shares of common stock for each year served as a director up to a maximum of 8,000 shares issued upon retirement. The Company recognizes compensation expense over the requisite service period. As a result, included in the Company’s consolidated statements of income was $ 339,000 , $ 316,000 and $ 550,000 in compensation expense for the years ended December 31, 2016 , 2015 and 2014 , respectively. Included in the 2014 compensation expense relating to the retirement shares was $ 243,000 of expense resulting from the increase in maximum shares. As of December 31, 2016 , 2015 and 2014 , there was $ 887,000 , $ 1. 2 million and $ 1. 5 million, respectively, of unamortized compensation expense related to these shares. In April, 2016, the Company issued 8,000 shares to a director upon retirement with an aggregate fair value of $775,000 . No shares were issued during the years ended December 31, 2015 and 2014 .

Supplementary Quarterly Financi

Supplementary Quarterly Financial Data	12 Months Ended
	Dec. 31, 2016
Supplementary Quarterly Financial Data [Abstract]
Supplementary Quarterly Financial Data	12. Supplementary quarterly financial data (unaudited, in thousands, except per share data) :     Three Months Ended  March 31, 2016 June 30, 2016 September 30, 2016 December 31, 2016  Rental income $ 95,845 $ 96,087 $ 97,340 $ 97,599  Cost of operations $ 31,894 $ 29,750 $ 30,796 $ 30,668  Net income allocable to  common shareholders $ 14,569 $ 15,731 $ 19,718 $ 12,854  Net income per share:  Basic $ 0.54 $ 0.58 $ 0.73 $ 0.47  Diluted $ 0.54 $ 0.58 $ 0.72 $ 0.47    Three Months Ended  March 31, 2015 June 30, 2015 September 30, 2015 December 31, 2015  Rental income $ 92,315 $ 92,948 $ 93,322 $ 94,550  Cost of operations $ 31,746 $ 30,057 $ 30,448 $ 28,973  Net income allocable to  common shareholders $ 19,771 $ 11,129 $ 22,484 $ 14,906  Net income per share:  Basic $ 0.73 $ 0.41 $ 0.83 $ 0.55  Diluted $ 0.73 $ 0.41 $ 0.83 $ 0.55 

Commitments And Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2016
Commitments And Contingencies [Abstract]
Commitments And Contingencies	13 . Commitments and contingencies  The Company currently is neither subject to any other material litigation nor, to management’s knowledge, is any material litigation currently threatened against the Company other than routine litigation and administrative proceedings arising in the ordinary course of business. 

401(k) Plan

401(k) Plan	12 Months Ended
	Dec. 31, 2016
Stock Compensation [Abstract]
401(k) Plan	14 . 401(k) Plan  The Company has a 401(k) savings plan (the “ Plan”) in which all eligible employees may participate. The Plan provides for the Company to make matching contributions to all eligible employees up to 4 % of their annual salary dependent on the employee’s level of participation. For the years ended December 31, 2016 , 2015 and 2014 , $ 409,000 , $ 410,000 , and $ 417,000 , respectively, was charged as expense related to this plan. 

Real Estate And Accumulated Dep

Real Estate And Accumulated Depreciation	12 Months Ended
	Dec. 31, 2016
Real Estate And Accumulated Depreciation [Abstract]
Real Estate and Accumulated Depreciation	PS BUSINESS PARKS, INC. SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION DECEMBER 31, 2016 (IN THOUSANDS)      Cost  Capitalized  Subsequent to Gross Amount at Which Carried at  Initial Cost to Company Acquisition December 31, 2016  Buildings Buildings Buildings Depreciable  and and and Accumulated Lives  Description Location Square Feet Land Improvements Improvements Land Improvements Total Depreciation Year(s) Acquired (Years)  Buena Park Industrial Center Buena Park, CA 317 $ 3,245 $ 7,703 $ 2,715 $ 3,245 $ 10,418 $ 13,663 $ 7,047 1997 5- 30  Carson Carson, CA 77 990 2,496 1,537 990 4,033 5,023 2,867 1997 5- 30  Cerritos Business Center Cerritos, CA 395 4,218 10,273 4,139 4,218 14,412 18,630 9,960 1997 5- 30  Cerritos/Edwards Cerritos, CA 31 450 1,217 1,421 450 2,638 3,088 1,946 1997 5- 30  Concord Business Park Concord, CA 246 12,454 20,491 1,027 12,454 21,518 33,972 5,070 2011 5- 30  Culver City Culver City, CA 147 3,252 8,157 6,031 3,252 14,188 17,440 10,468 1997 5- 30  Bayview Business Park Fremont, CA 104 4,990 4,831 328 4,990 5,159 10,149 1,509 2011 5- 30  Christy Business Park Fremont, CA 334 11,451 16,254 1,586 11,451 17,840 29,291 5,030 2011 5- 30  Industrial Drive Distribution Center Fremont, CA 199 7,482 6,812 798 7,482 7,610 15,092 1,820 2011 5- 30  Bay Center Business Park Hayward, CA 463 19,052 50,501 3,702 19,052 54,203 73,255 12,659 2011 5- 30  Cabot Distribution Center Hayward, CA 249 5,859 10,811 374 5,859 11,185 17,044 2,528 2011 5- 30  Diablo Business Park Hayward, CA 271 9,102 15,721 863 9,102 16,584 25,686 3,978 2011 5- 30  Eden Landing Hayward, CA 83 3,275 6,174 131 3,275 6,305 9,580 1,569 2011 5- 30  Hayward Business Park Hayward, CA 1,091 28,256 54,418 2,807 28,256 57,225 85,481 13,205 2011 5- 30  Huntwood Business Park Hayward, CA 176 7,391 11,819 889 7,391 12,708 20,099 3,327 2011 5- 30  Parkway Commerce Hayward, CA 407 4,398 10,433 4,222 4,398 14,655 19,053 9,816 1997 5- 30  Corporate Pointe Irvine, CA 161 6,876 18,519 6,760 6,876 25,279 32,155 17,027 2000 5- 30  Laguna Hills Commerce Center Laguna Hills, CA 513 16,261 39,559 7,317 16,261 46,876 63,137 30,670 1997 5- 30  Plaza Del Lago Laguna Hills, CA 101 2,037 5,051 4,060 2,037 9,111 11,148 6,473 1997 5- 30  Ca ada Business Center Lake Forest, CA 297 5,508 13,785 6,031 5,508 19,816 25,324 13,319 1997 5- 30  Dixon Landing Business Park Milpitas, CA 505 26,301 21,121 3,244 26,301 24,365 50,666 6,953 2011 5- 30  Monterey/Calle Monterey, CA 12 288 706 337 288 1,043 1,331 763 1997 5- 30  Monterey Park Monterey Park, CA 199 3,078 7,862 1,586 3,078 9,448 12,526 6,611 1997 5- 30  Port of Oakland Oakland, CA 200 5,638 11,066 627 5,638 11,693 17,331 2,817 2011 5- 30  Orangewood Orange County, CA 107 2,637 12,291 3,873 2,637 16,164 18,801 9,072 2003 5- 30  Orange County Business Center Orange County, CA 437 9,405 35,746 18,507 9,405 54,253 63,658 40,977 2003 5- 30  Kearney Mesa San Diego, CA 164 2,894 7,089 2,890 2,894 9,979 12,873 6,920 1997 5- 30  Lusk San Diego, CA 371 5,711 14,049 5,623 5,711 19,672 25,383 13,645 1997 5- 30  Rose Canyon Business Park San Diego, CA 233 15,129 20,054 2,321 15,129 22,375 37,504 12,005 2005 5- 30  Charcot Business Park San Jose, CA 283 18,654 17,580 1,704 18,654 19,284 37,938 5,239 2011/2014 5- 30  Las Plumas San Jose, CA 214 4,379 12,889 6,716 4,379 19,605 23,984 14,446 1998 5- 30  Little Orchard Distribution Center San Jose, CA 213 7,725 3,846 84 7,725 3,930 11,655 1,241 2011 5- 30  Montague Industrial Park San Jose, CA 316 14,476 12,807 485 14,476 13,292 27,768 4,334 2011 5- 30  Oakland Road San Jose, CA 177 3,458 8,765 3,233 3,458 11,998 15,456 8,267 1997 5- 30  Rogers Ave San Jose, CA 67 3,540 4,896 630 3,540 5,526 9,066 2,659 2006 5- 30  Doolittle Business Park San Leandro, CA 113 3,929 6,231 413 3,929 6,644 10,573 1,775 2011 5- 30      Cost  Capitalized  Subsequent to Gross Amount at Which Carried at  Initial Cost to Company Acquisition December 31, 2016  Buildings Buildings Buildings Depreciable  and and and Accumulated Lives  Description Location Square Feet Land Improvements Improvements Land Improvements Total Depreciation Year(s) Acquired (Years)  Bayshore Corporate Center San Mateo, CA 340 25,108 36,891 6,202 25,108 43,093 68,201 10,038 2013 5- 30  San Ramon/Norris Canyon San Ramon, CA 52 1,486 3,642 1,348 1,486 4,990 6,476 3,385 1997 5- 30  Commerce Park Santa Clara, CA 251 17,218 21,914 3,733 17,218 25,647 42,865 15,900 2007 5- 30  Santa Clara Tech Park Santa Clara, CA 178 7,673 15,645 4,514 7,673 20,159 27,832 13,468 2000 5- 30  Walsh at Lafayette Santa Clara, CA 321 13,439 17,890 281 13,439 18,171 31,610 5,151 2011 5- 30  Signal Hill Signal Hill, CA 269 6,693 12,699 2,695 6,693 15,394 22,087 9,169 1997/2006 5- 30  Airport Boulevard So San Francisco, CA 52 899 2,387 745 899 3,132 4,031 2,131 1997 5- 30  South San Francisco/Produce So San Francisco, CA 41 776 1,886 553 776 2,439 3,215 1,632 1997 5- 30  Studio City/Ventura Studio City, CA 22 621 1,530 589 621 2,119 2,740 1,420 1997 5- 30  Kifer Industrial Park Sunnyvale, CA 287 13,227 37,874 1,369 13,227 39,243 52,470 9,001 2011 5- 30  Torrance Torrance, CA 147 2,318 6,069 3,263 2,318 9,332 11,650 6,636 1997 5- 30  Boca Commerce Boca Raton, FL 135 7,795 9,258 3,056 7,795 12,314 20,109 4,550 2006 5- 30  MICC Miami, FL 3,468 95,115 112,583 40,445 95,115 153,028 248,143 87,812 2003/2011/2014 5- 30  Wellington Wellington, FL 263 10,845 18,560 2,490 10,845 21,050 31,895 8,792 2006 5- 30  Ammendale Beltsville, MD 309 4,278 18,380 11,175 4,278 29,555 33,833 21,995 1998 5- 30  Gaithersburg/Christopher Gaithersburg, MD 29 475 1,203 632 475 1,835 2,310 1,323 1997 5- 30  Metro Park Rockville, MD 898 33,995 94,463 40,692 33,995 135,155 169,150 87,175 2001 5- 30  Parklawn Business Park Rockville, MD 232 3,387 19,628 3,783 3,387 23,411 26,798 8,552 2010 5- 30  Shady Grove Rockville, MD 578 11,010 58,364 8,860 11,010 67,224 78,234 20,086 2010/2016 5- 30  Westech Business Park Silver Spring, MD 532 25,261 74,572 17,232 25,261 91,804 117,065 53,912 2006 5- 30  Ben White Austin, TX 108 1,550 7,015 1,952 1,550 8,967 10,517 6,312 1998 5- 30  Lamar Business Park Austin, TX 198 2,528 6,596 6,043 2,528 12,639 15,167 9,498 1997 5- 30  McKalla Austin, TX 236 1,945 13,212 2,188 1,945 15,400 17,345 7,563 1998/2012 5- 30  McNeil Austin, TX 525 5,477 24,495 4,513 5,477 29,008 34,485 10,425 1999/2010/2012/2014 5- 30  Rutland Austin, TX 235 2,022 9,397 2,160 2,022 11,557 13,579 8,017 1998/1999 5- 30  Waterford Austin, TX 106 2,108 9,649 3,823 2,108 13,472 15,580 9,215 1999 5- 30  Braker Business Park Austin, TX 257 1,874 13,990 1,723 1,874 15,713 17,587 6,327 2010 5- 30  Mopac Business Park Austin, TX 117 719 3,579 694 719 4,273 4,992 1,661 2010 5- 30  Southpark Business Park Austin, TX 181 1,266 9,882 2,361 1,266 12,243 13,509 5,109 2010 5- 30  Valwood Business Center Carrolton, TX 356 2,510 13,859 1,916 2,510 15,775 18,285 4,060 2013 5- 30  Empire Commerce Dallas, TX 44 304 1,545 814 304 2,359 2,663 1,754 1998 5- 30  Northgate Dallas, TX 194 1,274 5,505 4,112 1,274 9,617 10,891 6,893 1998 5- 30  Northway Plaza Farmers Branch, TX 131 1,742 4,503 791 1,742 5,294 7,036 1,352 2013 5- 30  Springlake Business Center Farmers Branch, TX 206 2,607 5,715 1,861 2,607 7,576 10,183 2,020 2013/2014 5- 30  Westwood Business Park Farmers Branch, TX 112 941 6,884 2,289 941 9,173 10,114 5,486 2003 5- 30  Eastgate Garland, TX 36 480 1,203 479 480 1,682 2,162 1,212 1997 5- 30  Freeport Business Park Irving, TX 256 4,564 9,506 2,348 4,564 11,854 16,418 2,920 2013 5- 30  NFTZ (1) Irving, TX 231 1,517 6,499 3,506 1,517 10,005 11,522 6,997 1998 5- 30  Royal Tech Irving, TX 794 13,989 54,113 23,889 13,989 78,002 91,991 50,291 1998-2000/2011 5- 30  La Prada Mesquite, TX 56 495 1,235 594 495 1,829 2,324 1,355 1997 5- 30  The Summit Plano, TX 184 1,536 6,654 4,291 1,536 10,945 12,481 8,140 1998 5- 30  Arapaho Business Park Richardson, TX 408 5,226 10,661 3,394 5,226 14,055 19,281 4,371 2013/2014 5- 30  Richardson Business Park Richardson, TX 117 799 3,568 2,954 799 6,522 7,321 4,834 1998 5- 30  Bren Mar Alexandria, VA 113 2,197 5,380 3,832 2,197 9,212 11,409 6,754 1997 5- 30  Eisenhower Alexandria, VA 95 1,440 3,635 2,486 1,440 6,121 7,561 4,610 1997 5- 30  Beaumont Chantilly, VA 107 4,736 11,051 2,238 4,736 13,289 18,025 7,419 2006 5- 30  Dulles South/Sullyfield Chantilly, VA 99 1,373 6,810 3,135 1,373 9,945 11,318 6,756 1999 5- 30  Lafayette Chantilly, VA 197 1,680 13,398 5,381 1,680 18,779 20,459 12,790 1999/2000 5- 30      Cost  Capitalized  Subsequent to Gross Amount at Which Carried at  Initial Cost to Company Acquisition December 31, 2016  Buildings Buildings Buildings Depreciable  and and and Accumulated Lives  Description Location Square Feet Land Improvements Improvements Land Improvements Total Depreciation Year(s) Acquired (Years)  Park East Chantilly, VA 198 3,851 18,029 10,270 3,851 28,299 32,150 19,339 1999 5- 30  Fair Oaks Business Campus Fairfax, VA 290 13,598 36,232 8,132 13,598 44,364 57,962 25,358 2004/2007 5- 30  Monroe Herndon, VA 244 6,737 18,911 11,274 6,737 30,185 36,922 21,005 1997/1999 5- 30  Gunston Lorton, VA 247 4,146 17,872 11,221 4,146 29,093 33,239 16,313 1998 5- 30  The Mile McLean, VA 628 38,279 83,596 22,340 38,279 105,936 144,215 37,304 2010/2011 5- 30  Prosperity Business Campus Merrifield, VA 659 23,147 67,575 31,491 23,147 99,066 122,213 63,020 2001 5- 30  Alban Road Springfield, VA 150 1,935 4,736 5,050 1,935 9,786 11,721 7,410 1997 5- 30  I-95 Springfield, VA 210 3,535 15,672 12,142 3,535 27,814 31,349 20,528 2000 5- 30  Northpointe Sterling, VA 147 2,767 8,778 4,587 2,767 13,365 16,132 9,976 1997/1998 5- 30  Shaw Road Sterling, VA 149 2,969 10,008 4,476 2,969 14,484 17,453 10,828 1998 5- 30  Tysons Corporate Center Vienna, VA 270 9,885 25,302 9,333 9,885 34,635 44,520 13,426 2010 5- 30  Woodbridge Woodbridge, VA 114 1,350 3,398 1,908 1,350 5,306 6,656 3,935 1997 5- 30  212th Business Park Kent, WA 951 19,573 17,695 12,134 19,573 29,829 49,402 8,335 2012 5- 30  Overlake Redmond, WA 411 23,122 41,106 6,692 23,122 47,798 70,920 27,685 2007 5- 30  Renton Renton, WA 28 330 889 597 330 1,486 1,816 1,065 1997 5- 30  28,072 $ 789,531 $ 1,716,799 $ 510,082 $ 789,531 $ 2,226,881 $ 3,016,412 $ 1,159,808 ____________  (1) The Company owns two properties that are subject to ground leases in Las Colinas, Texas, expiring in 2019 and 2020 , each with one 10 -year extension option .

Summary Of Significant Accoun22

Summary Of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2016
Summary Of Significant Accounting Policies [Abstract]
Basis Of Presentation	Basis of presentation  The accompanying consolidated financial statements include the accounts of PSB and the Operating Partnership. All significant inter-company balances and transactions have been eliminated in the consolidated financial statements. The financial statements are presented on an accrual basis in accordance with U.S. generally accepted accounting principles (“GAAP”).
Consolidation And Equity Method Of Accounting	Consolidation and Equity Method of Accounting  The Company accounts for its investment in a joint venture that it has significant influence over, but does not control, using the equity method of accounting eliminating intra-entity profits and losses as if the joint venture were a consolidated subsidiary.  The Company consolidates all variable interest entities (each a “VIE”) for which it is the primary beneficiary. Generally, a VIE is a legal entity in which the equity investors do not have the characteristics of a controlling financial interest or the equity investors lack sufficient equity at risk for the entity to finance its activities without additional subordinated financial support. A limited partnership may be considered a VIE if the limited partners do not participate in operating decisions. Under this criteria, the Operating Partnership is considered a VIE. The Company’s significant asset is its investment in the Operating Partnership, and consequently, substantially all of the Company’s assets and liabilities represent those assets and liabilities of the Operating Partnership. All of the Company’s debt is an obligation of the Operating Partnership.
Noncontrolling Interests	Noncontrolling interests  The Company's noncontrolling interests are reported as a component of equity separate from the parent’s equity. Purchases or sales of equity interests that do not result in a change in control are accounted for as equity transactions. In addition, net income attributable to the noncontrolling interests is included in net income on the face of the income statement and, upon a gain or loss of control, the interests purchased or sold, as well as any interests retained, are recorded at fair value with any gain or loss recognized in earnings. At the end of each reporting period, the Company determines the amount of equity (book value of net assets) which is allocable to the noncontrolling interests based upon the ownership interest, and an adjustment is made to the noncontrolling interests, with a corresponding adjustment to paid-in capital, to reflect the noncontrolling interests’ equity interest in the Company.
Use Of Estimates	Use of estimates  The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from these estimates.
Allowance For Doubtful Accounts	Allowance for doubtful accounts  The Company monitors the collectability of its receivable balances including the deferred rent receivable on an ongoing basis. Based on these reviews, the Company maintains an allowance for doubtful accounts for estimated losses resulting from the possible inability of tenants to make contractual rent payments to the Company. A provision for doubtful accounts is recorded during each period. The allowance for doubtful accounts is netted against tenant and other receivables on the consolidated balance sheets. Tenant receivables are net of an allowance for uncollectible accounts totaling $ 400,000 at December 31, 2016 and 2015 . Deferred rent receivable is net of an allowance for uncollectible accounts totaling $916,000 and $909,000 at December 31, 2016 and 2015 , respectively.
Financial Instruments	Financial instruments  The methods and assumptions used to estimate the fair value of financial instruments are described below. The Company has estimated the fair value of financial instruments using available market information and appropriate valuation methodologies. Considerable judgment is required in interpreting market data to develop estimates of market value. Accordingly, estimated fair values are not necessarily indicative of the amounts that could be realized in current market exchanges. The Company determines the estimated fair value of financial assets and liabilities utilizing a hierarchy of valuation techniques based on whether the inputs to a fair value measurement are considered to be observable or unobservable in a marketplace. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect market assumptions. This hierarchy requires the use of observable market data when available. The following is the fair value hierarchy:  · Level 1 —quoted prices for identical instruments in active markets;  · Level 2 —quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which significant inputs and significant value drivers are observable in active markets; and  · Level 3 —fair value measurements derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.  Financial assets that are exposed to credit risk consist primarily of cash and cash equivalents and receivables. The Company considers all highly liquid investments with a remaining maturity of three months or less at the date of purchase to be cash equivalents. Cash and cash equivalents, which consist primarily of money market investments, are only invested in entities with an investment grade rating. Receivables are comprised of balances due from a large number of customers. Balances that the Company expects to become uncollectible are reserved for or written off. Due to the short period to maturity of the Company’s cash and cash equivalents, accounts receivable, other assets and accrued and other liabilities, the carrying values as presented on the consolidated balance sheets are reasonable estimates of fair value.  Carrying values of the Company’s mortgage note payable and unsecured Credit Facility (as defined on page 62) approximate fair value. The characteristics of these financial instruments, market data and other comparative metrics utilized in determining these fair values are “Level 2” inputs.
Real Estate Facilities	Real estate facilities  Real estate facilities are recorded at cost. Costs related to the renovation or improvement of the properties are capitalized. Expenditures for repairs and maintenance are expensed as incurred. Expenditures that are expected to benefit a period greater than two years and exceed $ 2,000 are capitalized and depreciated over their estimated useful life. Buildings and improvements are depreciated using the straight-line method over their estimated useful lives, which generally range from five to 30 years. Transaction costs, which include tenant improvements and lease commissions, of $ 1,000 or more for leases with terms greater than one year are capitalized and depreciated over their estimated useful lives. Transaction costs less than $ 1,000 or for leases of one year or less are expensed as incurred.
Land and building held for development	Land and building held for development  Property taxes, insurance, interest and costs essential to the development of property for its intended use are capitalized during the period of development. Upon classification of an asset as held for development, depreciation of the asset is ceased.
Properties Held For Disposition	Properties held for disposition  An asset is classified as an asset held for disposition when it meets certain requirements, which include, among other criteria, the approval of the sale of the asset, the marketing of the asset for sale and the expectation by the Company that the sale will likely occur within the next 12 months. Upon classification of an asset as held for disposition, depreciation of the asset is ceased, and the net book value of the asset is included on the balance sheet as properties held for disposition.
Intangible Assets/Liabilities	Intangible assets/liabilities  Intangible assets and liabilities include above-market and below-market in-place lease values of acquired properties based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place leases and (ii) management’s estimate of fair market lease rates for the corresponding in-place leases, measured over a period equal to the remaining non-cancelable term of the lease. The capitalized above-market and below-market lease values (included in other assets and accrued liabilities in the accompanying consolidated balance sheets) are amortized to rental income over the remaining non-cancelable terms of the respective leases.  As of December 31, 2016 , the value of in-place leases resulted in net intangible assets of $ 1. 1 million, net of $ 9.2 million of accumulated amortization with a weighted average amortization period of 9.3 years and net intangible liabilities of $784,000 , net of $ 10. 0 million of accumulated amortization with a weighted average amortization period of 6.6 years. As of December 31, 2015 , the value of in-place leases resulted in net intangible assets of $ 1.7 million, net of $ 8.6 million of accumulated amortization and net intangible liabilities of $ 1.8 million, net of $ 9.0 million of accumulated amortization.  The Company recorded a net increase in rental income of $520,000 , $1.3 million and $901,000 during the years end ed December 31, 2016 , 2015 and 2014 , respectively, related to the amortization of net intangible liabilities resulting from the above-market and below-market lease value s.
Evaluation Of Asset Impairment	Evaluation of asset impairment  The Company evaluates its assets used in operations for impairment by identifying indicators of impairment and by comparing the sum of the estimated undiscounted future cash flows for each asset to the asset’s carrying value. When indicators of impairment are present and the sum of the estimated undiscounted future cash flows is less than the carrying value of such asset, an impairment loss is recorded equal to the difference between the asset’s current carrying value and its value based on discounting its estimated future cash flows. In addition, the Company evaluates its assets held for disposition for impairment. Assets held for disposition are reported at the lower of their carrying value or fair value, less cost of disposition. At December 31, 2016 , the Company did not consider any assets to be impaired.
Asset Impairment Due to Casualty Loss	Asset impairment due to casualty loss  It is the Company’s policy to record as a casualty loss or gain, in the period the casualty occurs, the differential between (a) the book value of assets destroyed and (b) any insurance proceeds that the Company expects to receive in accordance with its insurance contracts. Potential proceeds from insurance that are subject to any uncertainties, such as interpretation of deductible provisions of the governing agreements, the estimation of costs of restoration, or other such items, are treated as contingent proceeds and not recorded until the uncertainties are satisfied.  For the years ended December 31, 2016 , 2015 and 2014 no material casualty losses were incurred.
Stock Compensation	Stock compensation  All share-based payments to employees, including grants of employee stock options, are recognized as stock compensation in the Company’s income statement based on their grant date fair values. See Note 1 1 .
Revenue And Expense Recognition	Revenue and expense recognition  The Company must meet four basic criteria before revenue can be recognized: persuasive evidence of an arrangement exists; the delivery has occurred or services have been rendered; the fee is fixed or determinable; and collectability is reasonably assured. All leases are classified as operating leases. Rental income is recognized on a straight-line basis over the terms of the leases. Straight-line rent is recognized for all tenants with contractual fixed increases in rent that are not included on the Company’s credit watch list. Deferred rent receivable represents rental revenue recognized on a straight-line basis in excess of billed rents. Reimbursements from tenants for real estate taxes and other recoverable operating expenses are recognized as rental income in the period the applicable costs are incurred. Property management fees are recognized in the period earned.  Costs incurred in connection with leasing (primarily tenant improvements and lease commissions) are capitalized and amortized over the lease period.
Gains From Sales Of Real Estate Facilities	Gains from sales of real estate facilities  The Company recognizes gains from sales of real estate facilities at the time of sale using the full accrual method, provided that various criteria related to the terms of the transactions and any subsequent involvement by the Company with the properties sold are met. If the criteria are not met, the Company defers the gains and recognizes them when the criteria are met or uses the installment or cost recovery methods as appropriate under the circumstances.
General And Administrative Expenses	General and administrative expenses  General and administrative expenses include executive and other compensation, office expenses, professional fees, acquisition transaction costs, state income taxes and other such administrative items.
Income Taxes	Income taxes  The Company has qualified and intends to continue to qualify as a REIT, as defined in Section 856 of the Internal Revenue Code of 1986, as amended. As a REIT, the Company is not subject to federal income tax to the extent that it distributes its REIT taxable income to its shareholders. A REIT must distribute at least 90 % of its REIT taxable income each year. In addition, REITs are subject to a number of organizational and operating requirements. The Company may be subject to certain state and local taxes on its income and property and to federal income and excise taxes on its undistributed taxable income. The Company believes it met all organization and operating requirements to maintain its REIT status during 2016 , 2015 and 2014 and intends to continue to meet such requirements. Accordingly, no provision for income taxes has been made in the accompanying consolidated financial statements.  The Company can recognize a tax benefit only if it is “more likely than not” that a particular tax position will be sustained upon examination or audit. To the extent that the “more likely than not” standard has been satisfied, the benefit associated with a position is measured as the largest amount that is greater than 50 % likely of being recognized upon settlement. As of December 31, 2016 , the Company did not recognize any tax benefit for uncertain tax positions.
Accounting For Preferred Equity Issuance Costs	Accounting for preferred equity issuance costs  The Company records issuance costs as a reduction to paid-in capital on its balance sheet at the time the preferred securities are issued and reflects the carrying value of the preferred equity at the stated value. Such issuance costs are recorded as non-cash preferred equity distributions at the time the Company notifies the holders of preferred stock of its intent to redeem such shares.
Net Income Allocation	Net income allocation  Net income was allocated as follows for the years ended December 31, (in thousands) :     2016 2015 2014  Net income allocable to noncontrolling interests:  Noncontrolling interests — common units $ 16,955 $ 18,495 $ 30,729  Total net income allocable to noncontrolling interests 16,955 18,495 30,729  Net income allocable to PS Business Parks, Inc.:  Preferred shareholders  Distributions to preferred shareholders 57,276 59,398 60,488  Non-cash distributions related to the redemption of  preferred stock 7,312 2,487 —  Total net income allocable to preferred shareholders 64,588 61,885 60,488  Restricted stock unit holders 569 299 329  Common shareholders 62,872 68,291 113,154  Total net income allocable to PS Business Parks, Inc. 128,029 130,475 173,971  Net income $ 144,984 $ 148,970 $ 204,700 
Net Income Per Common Share	Net income per common share  Per share amounts are computed using the number of weighted average common shares outstanding. “Diluted” weighted average common shares outstanding includes the dilutive effect of stock options and restricted stock units under the treasury stock method. “Basic” weighted average common shares outstanding excludes such effect. The Company's restricted stock units are participating securities and are included in the computation of basic and diluted weighted average common shares outstanding. The Company’s restricted stock unit holders are paid non-forfeitable dividends in excess of the expense recorded which results in a reduction in net income allocable to common shareholders and unit holders.  Earnings per share has been calculated as follows for the years ended December 31, (in thousands, except per share amounts):     2016 2015 2014  Net income allocable to common shareholders $ 62,872 $ 68,291 $ 113,154  Weighted average common shares outstanding:  Basic weighted average common shares outstanding 27,089 26,973 26,899  Net effect of dilutive stock compensation — based on  treasury stock method using average market price 90 78 101  Diluted weighted average common shares outstanding 27,179 27,051 27,000  Net income per common share — Basic $ 2.32 $ 2.53 $ 4.21  Net income per common share — Diluted $ 2.31 $ 2.52 $ 4.19  Options to purchase 25,000 , 32,000 and 16,000 shares for the years ended December 31, 2016 , 2015 and 2014 , respectively, were not included in the computation of diluted net income per share because such options were considered anti-dilutive.
Segment Reporting	Segment reporting  The Company views its operations as one segment.
Reclassifications	Reclassifications  Certain reclassifications have been made to the consolidated financial statements for 2015 and 2014 in order to conform to the 2016 presentation.
Recently Issued Accounting Standards	Recently issued accounting standards  In May, 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers, which amended the existing accounting standards for revenue recognition. The core principle underlying this guidance is that entities will recognize revenue upon the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled for such exchange. The guidance also provides a model for the measurement and recognition of gains and losses on the sale of certain nonfinancial assets, such as property and equipment, including real estate. This guidance is currently effective for the Company’s fiscal year beginning January 1, 2018. Early adoption is permitted for the Company’s fiscal year beginning January 1, 2017. ASU 2014-09 allows for full retrospective adoption applied to all periods presented or modified retrospective adoption with the cumulative effect of initially applying the standard recognized at the date of initial application. The Company intends to adopt the guidance using the modified retrospective approach for the fiscal year beginning January 1, 2018. The Company anticipates no impact upon adoption of the new accounting guidance on its consolidated financial statements relating to the Company’s facility management fees for property management services provided to PS or the recognition of gains and losses on the sale of real estate assets as the Company’s current acco unting for such transactions is consistent with the new guidance’s core principle. Rental income from leasing arrangements are a substantial portion of the Company’s revenue and is specifically excluded from ASU 2014-09 and will be governed by the applicable lease codification (ASU 2016-02, Leases) . In conjunction with the adoption of the leasing guidance, the Company is currently in the process of evaluating certain variable payment terms included in these lease arrangements which are governed by ASU 2014-09.  In February, 2016, the FASB issued ASU 2016-02, Leases , which amends the existing accounting standards for lease accounting. The accounting applied by a lessor is largely unchanged under this guidance. However, the guidance requires lessees to classify leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee. The classification will determine whether the lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. A lessee is al so required to record a right-of-use asset and related liability for most leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating leases today. The new guidance is expected to result in the recognition of a right-of -use asset and related liability to account for our future obligations under our ground lease arrangements for which we are the lessee. As of December 31, 2016, the remaining contractual payments under our ground lease agreements aggregated $381,000 . Additionally, the new guidance will require that lessees and lessors capitalize, as initial direct costs, only those costs that are incurred due to the execution of a lease. This guidance is effective for annual periods beginning after December 15, 2018 and interim periods within annual periods beginning after December 15, 2018. Early adoption is permitted. The guidance must be adopted using a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. The Company is currently in the process of evaluating the impact of adoption of the new accounting guidance on its consolidated financial statements.  In August, 2014, the FASB issued ASU 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern , which is intended to define management’s responsibility to evaluate whether there is substantial doubt about an organization’s ability to continue as a going concern for a period of one year after the date that the financial statements are issued. This guidance is effective for annual periods ending after December 15, 2016 and interim periods within annual periods beginning after December 15, 2016. The Company adopted the new guidance during the fourth quarter of 2016 and the adoption did not require any disclosures about the Company’s ability to continue as a going concern.  In February, 2015, the FASB issued ASU 2015-02, Consolidation – Amendments to the Consolidation Analysis , which amended the existing accounting standards for consolidation under both the variable interest model and the voting model. On January 1, 2016, the Company adopted this guidance and as the Operating Partnership is already consolidated in the balance sheets of the Company, the identification of this entity as a VIE has no impact on the consolidated financial statements of the Company. Additionally, the Company’s accounting for its investment in its joint venture was not impacted by the adoption of this guidance.  In March, 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting , to amend the accounting guidance for share-based payment accounting. The Company early adopted this standard effective October 1, 2016. Under this standard, a share-based payment related to the tax liability paid on behalf of employees in lieu of shares received is classified as a financing activity on the statement of cash flows, rather than as an operating activity as the Company had previously presented such amounts. The Company applied this provision retrospectively. On our consolidated statement s of cash flows for the years ended Decemb er 31, 2015 and 2014, the Company reclassified $ 767,000 and $ 409,000 , respectively, for share-based payment s related to tax liability paid on behalf of employees in lieu of shares received upon vesting of restricted stock units as a reduction from financing activities. The Company previously reflected these amounts as a reduction from operating activities. The standard also allows an employer to make a policy election to account for forfeitures of share-based payments as they occur or estimate forfeitures and adjust the estimate when it is likely to change, as is currently required. The Company elected to recognize forfeitures of share-based payments as they occur, rather than estimating them in advance, effective October 1, 2016, under the modified retrospective transition method. The Company recorded a cumulative-effect adjustment of $807,000 to decrease cumulative net income and increase paid-in capital as of October 1, 2016, representing the impact of estimated forfeitures on our cumulative share-based compensation expense recorded through September 30, 2016. See Note 11.

Summary Of Significant Accoun23

Summary Of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2016
Summary Of Significant Accounting Policies [Abstract]
Net Income Allocation	   2016 2015 2014  Net income allocable to noncontrolling interests:  Noncontrolling interests — common units $ 16,955 $ 18,495 $ 30,729  Total net income allocable to noncontrolling interests 16,955 18,495 30,729  Net income allocable to PS Business Parks, Inc.:  Preferred shareholders  Distributions to preferred shareholders 57,276 59,398 60,488  Non-cash distributions related to the redemption of  preferred stock 7,312 2,487 —  Total net income allocable to preferred shareholders 64,588 61,885 60,488  Restricted stock unit holders 569 299 329  Common shareholders 62,872 68,291 113,154  Total net income allocable to PS Business Parks, Inc. 128,029 130,475 173,971  Net income $ 144,984 $ 148,970 $ 204,700 
Calculation Of Earnings Per Share	   2016 2015 2014  Net income allocable to common shareholders $ 62,872 $ 68,291 $ 113,154  Weighted average common shares outstanding:  Basic weighted average common shares outstanding 27,089 26,973 26,899  Net effect of dilutive stock compensation — based on  treasury stock method using average market price 90 78 101  Diluted weighted average common shares outstanding 27,179 27,051 27,000  Net income per common share — Basic $ 2.32 $ 2.53 $ 4.21  Net income per common share — Diluted $ 2.31 $ 2.52 $ 4.19 

Real Estate Facilities (Tables)

Real Estate Facilities (Tables)	12 Months Ended
	Dec. 31, 2016
Real Estate Facilities [Abstract]
Activity In Real Estate Facilities	   Buildings and Accumulated  Land Improvements Depreciation Total  Balances at December 31, 2013 $ 772,161 $ 2,115,987 $ (896,189) $ 1,991,959  Acquisition of real estate facilities 21,408 24,890 — 46,298  Capital expenditures — 54,462 — 54,462  Disposals — (10,587) 10,587 —  Depreciation and amortization — — (110,357) (110,357)  Transfer to properties sold — (1,759) 4,462 2,703  Balances at December 31, 2014 793,569 2,182,993 (991,497) 1,985,065  Capital expenditures — 46,777 — 46,777  Disposals — (13,990) 13,990 —  Depreciation and amortization — — (105,394) (105,394)  Transfer to properties sold — (265) 298 33  Balances at December 31, 2015 793,569 2,215,515 (1,082,603) 1,926,481  Acquisition of real estate facilities 5,638 7,637 — 13,275  Capital expenditures — 37,232 — 37,232  Disposals — (14,411) 14,411 —  Depreciation and amortization — — (99,486) (99,486)  Transfer to land and building held for development (9,676) (19,092) 7,870 (20,898)  Balances at December 31, 2016 $ 789,531 $ 2,226,881 $ (1,159,808) $ 1,856,604 
Summary Of Real Estate Assets Acquired And Liabilities Assumed	   2016 2015 2014  Land $ 5,638 $ — $ 21,408  Buildings and improvements 7,637 — 24,890  Below-market in-place lease value (25) — (666)  Total purchase price 13,250 — 45,632  Net operating assets acquired and liabilities assumed (622) — (611)  Total cash paid $ 12,628 $ — $ 45,021 

Leasing Activity (Tables)

Leasing Activity (Tables)	12 Months Ended
	Dec. 31, 2016
Leasing Activity [Abstract]
Summary Of Future Minimum Rental Revenues Excluding Recovery Of Operating Expenses	   2017 $ 274,275  2018 211,707  2019 145,187  2020 94,697  2021 63,185  Thereafter 114,628  Total $ 903,679 

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2016
Shareholders' Equity [Abstract]
Schedule Of Preferred Stock Outstanding	   December 31, 2016 December 31, 2015  Earliest Potential Dividend Shares Amount Shares Amount  Series Issuance Date Redemption Date Rate Outstanding (in thousands) Outstanding (in thousands)  Series T May, 2012 May, 2017 6.000% 14,000 $ 350,000 14,000 $ 350,000  Series U September, 2012 September, 2017 5.750% 9,200 230,000 9,200 230,000  Series V March, 2013 March, 2018 5.700% 4,400 110,000 4,400 110,000  Series W October, 2016 October, 2021 5.200% 7,590 189,750 — —  Series S January, 2012 January, 2017 6.450% — — 9,200 230,000  Total 35,190 $ 879,750 36,800 $ 920,000 

Stock Compensation (Tables)

Stock Compensation (Tables)	12 Months Ended
	Dec. 31, 2016
Stock Compensation [Abstract]
Summary Of Stock Options Activity	   Weighted Aggregate  Weighted Average Intrinsic  Number of Average Remaining Value  Options: Options Exercise Price Contract Life (in thousands)  Outstanding at December 31, 2013 380,773 $ 56.45  Granted 16,000 $ 82.84  Exercised (61,273) $ 49.84  Forfeited (4,000) $ 52.35  Special cash dividend adjustment (1) 10,352 $ N/A  Outstanding at December 31, 2014 341,852 $ 57.11  Granted 16,000 $ 80.13  Exercised (99,178) $ 51.31  Forfeited — $ —  Outstanding at December 31, 2015 258,674 $ 60.76  Granted 39,000 $ 102.58  Exercised (68,019) $ 57.17  Forfeited — $ —  Outstanding at December 31, 2016 229,655 $ 68.93 5.35 Years $ 10,930  Exercisable at December 31, 2016 153,432 $ 58.63 3.92 Years $ 8,882 ____________  (1) In accordance with the applicable equity award plan documents, the number and exercise price of outstanding options as of December 31, 2014 have been adjusted as a result of the Special Cash Dividend so that the option holder maintains their economic position with respect to the shareholders. 
Nonvested Restricted Stock Units	   Weighted  Number of Average Grant  Restricted Stock Units: Units Date Fair Value  Nonvested at December 31, 2013 45,100 $ 60.07  Granted 6,800 $ 81.47  Vested (12,980) $ 53.65  Forfeited (3,750) $ 69.00  Nonvested at December 31, 2014 35,170 $ 65.62  Granted 75,606 $ 82.78  Vested (25,384) $ 74.19  Forfeited (6,740) $ 76.22  Nonvested at December 31, 2015 78,652 $ 78.44  Granted 119,950 $ 87.45  Vested (47,779) $ 80.45  Forfeited (6,130) $ 76.51  Nonvested at December 31, 2016 144,693 $ 58.56 

Supplementary Quarterly Finan28

Supplementary Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2016
Supplementary Quarterly Financial Data [Abstract]
Schedule Of Supplemental Quarterly Financial Data	   Three Months Ended  March 31, 2016 June 30, 2016 September 30, 2016 December 31, 2016  Rental income $ 95,845 $ 96,087 $ 97,340 $ 97,599  Cost of operations $ 31,894 $ 29,750 $ 30,796 $ 30,668  Net income allocable to  common shareholders $ 14,569 $ 15,731 $ 19,718 $ 12,854  Net income per share:  Basic $ 0.54 $ 0.58 $ 0.73 $ 0.47  Diluted $ 0.54 $ 0.58 $ 0.72 $ 0.47    Three Months Ended  March 31, 2015 June 30, 2015 September 30, 2015 December 31, 2015  Rental income $ 92,315 $ 92,948 $ 93,322 $ 94,550  Cost of operations $ 31,746 $ 30,057 $ 30,448 $ 28,973  Net income allocable to  common shareholders $ 19,771 $ 11,129 $ 22,484 $ 14,906  Net income per share:  Basic $ 0.73 $ 0.41 $ 0.83 $ 0.55  Diluted $ 0.73 $ 0.41 $ 0.83 $ 0.55 

Organization And Description 29

Organization And Description Of Business (Narrative) (Details) ft² in Thousands, shares in Millions	Dec. 31, 2016ft²stateshares
Organization And Description Of Business [Line Items]
The Company's ownership percentage of the limited partnership	77.90%
Owned and operated properties (in rentable square feet)	28,100
Number of states with rentable commercial space | state	6
Managed properties (in rentable square feet)	684
Public Storage Ownership [Member]
Organization And Description Of Business [Line Items]
Affiliate's percent ownership of the Company's common equity	42.00%
Shares owned by Public Storage | shares	14.5

Summary Of Significant Accoun30

Summary Of Significant Accounting Policies (Narrative) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)segmentshares	Dec. 31, 2015USD ($)shares	Dec. 31, 2014USD ($)shares
Property, Plant and Equipment [Line Items]
Allowance for uncollectible accounts		$ 400,000	$ 400,000
Allowance for uncollectable deferred rent receivables		$ 916,000	909,000
Cash and cash equivalents maximum benchmark (in months)		3 months
Minimum expenditure costs subject to capitalization and depreciation		$ 2,000
Minimum expected future benefit period on expenditures cost to be capitalized and depreciated (in years)		2 years
Minimum transaction cost subject to capitalization and depreciation		$ 1,000
Minimum expected future benefit period on transaction cost to be capitalized and depreciated (in years)		1 year
Maximum transaction costs subject to being expensed as incurred		$ 1,000
Maximum length of lease period for transaction costs to be expensed as incurred		1 year
Length of time criteria for expected sale of assets to be classified as properties held for disposition		12 months
Increase (decrease) in rental income due to amortization of net intangible assets or liabilities		$ 520,000	1,251,000	$ 901,000
Value of in-place leases resulting in a net intangible asset		1,100,000	1,700,000
Accumulated amortization - intangible assets		$ 9,200,000	8,600,000
Intangible assets, weighted average amortization period (in years)		9 years 3 months 18 days
Value of in-place leases resulting in a net intangible liability		$ 784,000	1,800,000
Accumulated amortization - intangible liabilities		$ 10,000,000	$ 9,000,000
Intangible liability, weighted average amortization period (in years)		6 years 7 months 6 days
Distribution of taxable income requirement		90.00%
Income tax provision		$ 0
Odds of a particular tax position will be sustained upon examination or audit		50.00%
Anti-dilutive share options to purchase | shares		25,000	32,000	16,000
Number of operating segments | segment		1
Minimum lease term requirement		12 months
Adjustments on cumulative share-based compensation expense		$ 1,940,000	$ 767,000	$ 409,000
Cumulative effect of a change in accounting principle (Note 11)	$ 807,000
Ground Lease Agreements [Member]
Property, Plant and Equipment [Line Items]
Aggregate amount of contractual payments remaining under ground lease agreements		$ 381,000
Maximum [Member] | Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)		30 years
Minimum [Member] | Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)		5 years

Summary Of Significant Accoun31

Summary Of Significant Accounting Policies (Net Income Allocation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary Of Significant Accounting Policies [Abstract]
Noncontrolling interests - common units									$ 16,955	$ 18,495	$ 30,729
Total net income allocable to noncontrolling interests									16,955	18,495	30,729
Distributions to preferred shareholders									57,276	59,398	60,488
Non-cash distributions related to the redemption of preferred stock									7,312	2,487
Total net income allocable to preferred shareholders									64,588	61,885	60,488
Restricted stock unit holders									569	299	329
Common shareholders	$ 12,854	$ 19,718	$ 15,731	$ 14,569	$ 14,906	$ 22,484	$ 11,129	$ 19,771	62,872	68,291	113,154
Total net income allocable to PS Business Parks, Inc.									128,029	130,475	173,971
Net income									$ 144,984	$ 148,970	$ 204,700

Summary Of Significant Accoun32

Summary Of Significant Accounting Policies (Calculation Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary Of Significant Accounting Policies [Abstract]
Net income allocable to common shareholders	$ 12,854	$ 19,718	$ 15,731	$ 14,569	$ 14,906	$ 22,484	$ 11,129	$ 19,771	$ 62,872	$ 68,291	$ 113,154
Basic weighted average common shares outstanding									27,089	26,973	26,899
Net effect of dilutive stock compensation - based on treasury stock method using average market price									90	78	101
Diluted weighted average common shares outstanding									27,179	27,051	27,000
Net income per common share - Basic	$ 0.47	$ 0.73	$ 0.58	$ 0.54	$ 0.55	$ 0.83	$ 0.41	$ 0.73	$ 2.32	$ 2.53	$ 4.21
Net income per common share - Diluted	$ 0.47	$ 0.72	$ 0.58	$ 0.54	$ 0.55	$ 0.83	$ 0.41	$ 0.73	$ 2.31	$ 2.52	$ 4.19

Real Estate Facilities (Narrati

Real Estate Facilities (Narrative) (Details) ft² in Thousands	2 Months Ended	12 Months Ended
	Dec. 31, 2016USD ($)ft²	Dec. 31, 2016USD ($)ft²property	Dec. 31, 2015USD ($)ft²item	Dec. 31, 2014USD ($)aft²item	Sep. 28, 2016USD ($)ft²property	Dec. 30, 2014USD ($)ft²item	Nov. 03, 2014USD ($)ft²	Aug. 21, 2014USD ($)ft²item	Jul. 28, 2014USD ($)ft²	Jul. 24, 2014USD ($)ft²
Real Estate Facilities [Line Items]
Federal income tax basis of real estate facilities	$ 1,900,000,000	$ 1,900,000,000
Assets acquired and liabilities assumed			$ 0
Purchase price	$ 13,250,000	13,250,000		$ 45,632,000
Acquisition transaction costs		$ 328,000		350,000
Square Footage of Real Estate Property | ft²	28,072	28,072
Proceeds from sale of real estate facilities			55,160,000	212,184,000
Gain on sale of real estate facilities			$ 28,235,000	$ 92,373,000
Charcot Business Park II [Member]
Real Estate Facilities [Line Items]
Acquisition date of real estate		Dec. 30, 2014
Number of buildings acquired | item						8
Purchase price						$ 16,000,000
Square Footage of Real Estate Property | ft²						119
Charcot Business Park [Member]
Real Estate Facilities [Line Items]
Square Footage of Real Estate Property | ft²	164	164
McNeil I [Member]
Real Estate Facilities [Line Items]
Acquisition date of real estate		Nov. 3, 2014
Purchase price							$ 10,600,000
Square Footage of Real Estate Property | ft²							246
MICC Center 23 [Member]
Real Estate Facilities [Line Items]
Acquisition date of real estate		Jul. 24, 2014
Purchase price										$ 12,700,000
Square Footage of Real Estate Property | ft²										149
MICC [Member]
Real Estate Facilities [Line Items]
Square Footage of Real Estate Property | ft²	3,300	3,300
Arapaho Business Park 9 [Member]
Real Estate Facilities [Line Items]
Acquisition date of real estate		Jul. 28, 2014
Purchase price									$ 1,100,000
Square Footage of Real Estate Property | ft²									19
Springlake Business Center II [Member]
Real Estate Facilities [Line Items]
Acquisition date of real estate		Aug. 21, 2014
Number of buildings acquired | item								6
Purchase price								$ 5,100,000
Square Footage of Real Estate Property | ft²								145
Arapaho Business Park [Member]
Real Estate Facilities [Line Items]
Square Footage of Real Estate Property | ft²	389	389
Non Strategic Markets [Member]
Real Estate Facilities [Line Items]
Number of acres | a				11.5
Number of business parks sold | item			4	5
Square Footage of Real Estate Property | ft²			492	1,900
Proceeds from sale of real estate facilities			$ 41,200,000	$ 212,200,000
Gain on sale of real estate facilities			$ 23,400,000	$ 92,400,000
Overlake Business Park [Member]
Real Estate Facilities [Line Items]
Number of buildings sold | item			5
Square Footage of Real Estate Property | ft²			82
Proceeds from sale of real estate facilities			$ 13,900,000
Gain on sale of real estate facilities			$ 4,800,000
Shady Grove [Member]
Real Estate Facilities [Line Items]
Business acquisition, date of acquisition agreement		Sep. 28, 2016
Number of buildings acquired | property					2
Purchase price					$ 13,300,000
Square Footage of Real Estate Property | ft²	578	578			226
Shady Grove Executive Park [Member]
Real Estate Facilities [Line Items]
Number of buildings owned | property		3
Square Footage of Real Estate Property | ft²	352	352
The Mile [Member]
Real Estate Facilities [Line Items]
Square Footage of Real Estate Property | ft²	628	628
Area of real estate property transferred | ft²	123

Real Estate Facilities (Activit

Real Estate Facilities (Activity In Real Estate Facilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Balances	$ 1,926,481	$ 1,985,065	$ 1,991,959
Accumulated Depreciation, Balances	(1,082,603)
Acquisition of real estate facilities	13,275		46,298
Capital expenditures	37,232	46,777	54,462
Depreciation and amortization	(99,486)	(105,394)	(110,357)
Transfer to properties sold		33	2,703
Transfer to land and building held for development	(20,898)
Accumulated Depreciation, Balances	(1,159,808)	(1,082,603)
Balances	1,856,604	1,926,481	1,985,065
Land [Member]
Property, Plant and Equipment [Line Items]
Balances	793,569	793,569	772,161
Acquisition of real estate facilities	5,638		21,408
Capital expenditures
Disposals
Depreciation and amortization
Transfer to properties sold
Transfer to land and building held for development	(9,676)
Balances	789,531	793,569	793,569
Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Balances	2,215,515	2,182,993	2,115,987
Acquisition of real estate facilities	7,637		24,890
Capital expenditures	37,232	46,777	54,462
Disposals	(14,411)	(13,990)	(10,587)
Transfer to properties sold		(265)	(1,759)
Transfer to land and building held for development	(19,092)
Balances	2,226,881	2,215,515	2,182,993
Accumulated Depreciation [Member]
Property, Plant and Equipment [Line Items]
Accumulated Depreciation, Balances	(1,082,603)	(991,497)	(896,189)
Disposals	14,411	13,990	10,587
Depreciation and amortization	(99,486)	(105,394)	(110,357)
Transfer to properties sold		298	4,462
Transfer to land and building held for development	7,870
Accumulated Depreciation, Balances	$ (1,159,808)	$ (1,082,603)	$ (991,497)

Real Estate Facilities (Summary

Real Estate Facilities (Summary Of Real Estate Assets Acquired And Liabilities Assumed) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2014
Real Estate Facilities [Abstract]
Land	$ 5,638	$ 21,408
Buildings and improvements	7,637	24,890
Below-market in-place lease value	(25)	(666)
Total purchase price	13,250	45,632
Net operating assets acquired and liabilities assumed	(622)	(611)
Total cash paid	$ 12,628	$ 45,021

Investment In And Advances To36

Investment In And Advances To Unconsolidated Joint Venture (Narrative) (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2015USD ($)	Dec. 31, 2016USD ($)apropertyitem	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Schedule of Equity Method Investments [Line Items]
Investment in and advances to unconsolidated joint venture	$ 26,736,000	$ 67,190,000	$ 26,736,000
Land and building held for development	6,081,000	27,028,000	6,081,000
Land	793,569,000	$ 789,531,000	793,569,000
Investment in and Advances to Unconsolidated Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Economic interest in joint venture, percentage		95.00%
Number of units to be developed | property		395
Area of land | a		5
Contribution date		Oct. 5, 2015
Number of extension options | item		2
Extension option period		1 year
Construction Loan Capacity		$ 75,000,000
Construction loan maturity date		Apr. 5, 2019
Equity and capital contributions	5,200,000	$ 5,700,000
Cumulative equity and capital contributions		28,500,000
Loan advances	0	33,900,000	0
Capitalized interest	$ 346,000	885,000
Estimated total development costs		105,600,000
Land		$ 15,300,000
Investment in and Advances to Unconsolidated Joint Venture [Member] | London Interbank Offered Rate (LIBOR) [Member]
Schedule of Equity Method Investments [Line Items]
Spread over LIBOR		2.25%
JV Partner [Member] | Investment in and Advances to Unconsolidated Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Economic interest in joint venture, percentage		5.00%
Northern Virginia Redeveloped Land [Member]
Schedule of Equity Method Investments [Line Items]
Capitalized cost			2,800,000	$ 2,200,000
Capitalized interest			$ 813,000	944,000
Land and building held for development				$ 18,400,000

Leasing Activity (Narrative) (D

Leasing Activity (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Leased Assets [Line Items]
Tenant reimbursements	$ 82.6	$ 78.9	$ 80.7
Percentage of leased asset subjected to termination options	3.60%
Percentage of leased asset exercisable in period	2.30%
Maximum [Member]
Operating Leased Assets [Line Items]
Non-cancelable leases term (in years)	10 years
Minimum [Member]
Operating Leased Assets [Line Items]
Non-cancelable leases term (in years)	1 year

Leasing Activity (Summary Of Fu

Leasing Activity (Summary Of Future Minimum Rental Revenues Excluding Recovery Of Operating Expenses) (Details) $ in Thousands	Dec. 31, 2016USD ($)
Leasing Activity [Abstract]
2,017	$ 274,275
2,018	211,707
2,019	145,187
2,020	94,697
2,021	63,185
Thereafter	114,628
Total	$ 903,679

Bank Loans (Details)

Bank Loans (Details) - USD ($)	Dec. 06, 2016	Jan. 31, 2017	Feb. 24, 2017	Dec. 31, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Credit Facility - repaid amount				$ 116,000,000
Series S [Member]
Line of Credit Facility [Line Items]
Cumulative preferred stock, dividend rate	6.45%			6.45%
Wells Fargo Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit, expiration date				May 1, 2019
Credit Facility, borrowing limit				$ 250,000,000
Credit Facility, frequency of interest payment				monthly
Spread over LIBOR				0.875%
Credit Facility, percentage of commitment fees				0.125%
Credit Facility, amount outstanding				$ 0	$ 0
Unamortized commitment fees				$ 539,000	$ 769,000
Wells Fargo Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Spread over LIBOR			0.825%
Credit Facility, amount outstanding			$ 85,000,000
Wells Fargo Credit Facility [Member] | Subsequent Event [Member] | Expiration Date Extension [Member]
Line of Credit Facility [Line Items]
Line of credit, expiration date		Jan. 10, 2022
Wells Fargo Credit Facility [Member] | Maximum [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Spread over LIBOR		1.55%
Credit Facility, percentage of commitment fees		0.30%
Wells Fargo Credit Facility [Member] | Minimum [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Spread over LIBOR		0.80%
Credit Facility, percentage of commitment fees		0.10%

Mortgage Note Payable (Narrativ

Mortgage Note Payable (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jun. 01, 2016
Debt Instrument [Line Items]
Mortgage note repayment amount	$ 250,000
5.45% Mortgage Note [Member]
Debt Instrument [Line Items]
Interest rate		5.45%
Repayment date	Jun. 1, 2016

Noncontrolling Interests (Narra

Noncontrolling Interests (Narrative) (Details) - $ / shares	Dec. 30, 2014	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2014	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Noncontrolling Interests [Line Items]
Number of years from date of admission as a limited partner for redemption of partnership interest							1 year
Number of common stock per unit of limited partnership interest redeemed		1					1
Dividends declared per common share		$ 0.75	$ 0.75	$ 0.50	$ 0.60	$ 0.50	$ 3	$ 2.20	$ 4.75
Special Cash Dividend Paid [Member]
Noncontrolling Interests [Line Items]
Dividends declared per common share	$ 2.75
Public Storage Ownership [Member]
Noncontrolling Interests [Line Items]
Common units owned by affiliate		7,305,355					7,305,355
Affiliate's percent ownership of the Company's common equity		42.00%					42.00%
Shares owned by Public Storage		14,500,000					14,500,000

Related Party Transactions (Nar

Related Party Transactions (Narrative) (Details)	12 Months Ended
	Dec. 31, 2016USD ($)item	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Related Party Transaction [Line Items]
Royalty-free license agreement written notice of termination period minimum (in months)	6 months
Property management contract term (in years)	7 years
Extended property management contract period (in years)	1 year
Management fee revenues	$ 518,000	$ 540,000	$ 660,000
Number of assets owned that are maintained by Public Storage | item	2
Property management contract written notice of termination period minimum (in days)	60 days
Management fee expenses	$ 86,000	79,000	70,000
Administrative services costs	493,000	469,000	$ 451,000
Due from related parties	295,000	$ 57,000
PS [Member]
Related Party Transaction [Line Items]
Costs allocated to PS	$ 38,000

Shareholders' Equity (Narrative

Shareholders' Equity (Narrative) (Details)	Dec. 06, 2016USD ($)	Oct. 20, 2016USD ($)$ / shares	Oct. 15, 2015USD ($)	Dec. 31, 2016USD ($)item$ / sharesshares	Dec. 31, 2015USD ($)shares	Dec. 31, 2014USD ($)
Class of Stock [Line Items]
Shares issued value				$ 879,750,000	$ 920,000,000
Depositary shares | shares				35,190	36,800
Redemption of preferred stock					$ 75,000,000
Non-cash distributions related to the redemption of preferred stock				$ 7,312,000	2,487,000
Distributions Recorded To Preferred Shareholders				$ 64,600,000	61,900,000	$ 60,500,000
Number of quarterly dividends in arrearage before preferred shareholders can elect additional board members | item				6
Number of additional board members the preferred shareholders can elect in the case of an excess arrearage of quarterly dividends | item				2
Dividends in arrears				$ 0
Redeemable preferred stock, redemption price per share | $ / shares				$ 25
Preferred stock, aggregate deferred issuance costs outstanding				$ 28,400,000	$ 29,300,000
Series S [Member]
Class of Stock [Line Items]
Shares issued value	$ 230,000,000
Depositary shares | shares					9,200
Cumulative preferred stock, dividend rate	6.45%			6.45%
Issuance Date				Jan. 1, 2012
Redemption date				Jan. 1, 2017
Series R [Member]
Class of Stock [Line Items]
Cumulative preferred stock, dividend rate			6.875%
Redemption of preferred stock			$ 75,000,000
Series W [Member]
Class of Stock [Line Items]
Shares issued value		$ 189,800,000
Depositary shares | shares				7,590
Depositary shares conversion ratio to preferred share		0.10%
Preferred stock issuance price per depositary share | $ / shares		$ 25
Cumulative preferred stock, dividend rate		5.20%		5.20%
Non-callable period for Preferred Units				5 years
Issuance Date				Oct. 1, 2016
Redemption date				Oct. 1, 2021

Shareholders' Equity (Common An

Shareholders' Equity (Common And Equity Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands	2 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	Feb. 24, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2014	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Shareholders' Equity [Line Items]
Increase in Distributions paid to common shareholders per quarter							$ 81,285	$ 59,377	$ 127,838
Dividends declared per common share		$ 0.75	$ 0.75	$ 0.50	$ 0.60	$ 0.50	$ 3	$ 2.20	$ 4.75
Percentage of distributions classified as ordinary income							100.00%	89.40%	70.50%
Percentage of distributions classified as long-term capital gain income							0.00%	10.60%	29.50%
Equity stock, shares authorized		100,000,000					100,000,000
Common Stock [Member]
Shareholders' Equity [Line Items]
Aggregate number of common stock repurchased in the period							0	0	0
Special Cash Dividend [Member]
Shareholders' Equity [Line Items]
Dividends declared per common share				$ 2.75
Subsequent Event [Member]
Shareholders' Equity [Line Items]
Increase in distributions per quarter	$ 3,400
Dividends declared per common share	$ 0.85

Shareholders' Equity (Schedule

Shareholders' Equity (Schedule Of Preferred Stock Outstanding) (Details) - USD ($) $ in Thousands	Dec. 06, 2016	Oct. 20, 2016	Dec. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Shares Outstanding			35,190	36,800
Amount			$ 879,750	$ 920,000
Series T [Member]
Class of Stock [Line Items]
Issuance Date			May 1, 2012
Earliest Potential Redemption Date			May 1, 2017
Dividend Rate			6.00%
Shares Outstanding			14,000	14,000
Amount			$ 350,000	$ 350,000
Series U [Member]
Class of Stock [Line Items]
Issuance Date			Sep. 1, 2012
Earliest Potential Redemption Date			Sep. 1, 2017
Dividend Rate			5.75%
Shares Outstanding			9,200	9,200
Amount			$ 230,000	$ 230,000
Series V [Member]
Class of Stock [Line Items]
Issuance Date			Mar. 1, 2013
Earliest Potential Redemption Date			Mar. 1, 2018
Dividend Rate			5.70%
Shares Outstanding			4,400	4,400
Amount			$ 110,000	$ 110,000
Series W [Member]
Class of Stock [Line Items]
Issuance Date			Oct. 1, 2016
Earliest Potential Redemption Date			Oct. 1, 2021
Dividend Rate		5.20%	5.20%
Shares Outstanding			7,590
Amount			$ 189,750
Series S [Member]
Class of Stock [Line Items]
Issuance Date			Jan. 1, 2012
Earliest Potential Redemption Date			Jan. 1, 2017
Dividend Rate	6.45%		6.45%
Shares Outstanding				9,200
Amount				$ 230,000

Stock Compensation (Narrative)

Stock Compensation (Narrative) (Details)	1 Months Ended	9 Months Ended	12 Months Ended
	Apr. 30, 2016USD ($)	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)item$ / sharesshares	Dec. 31, 2015USD ($)$ / sharesshares	Dec. 31, 2014USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative effect of a change in accounting principle | $		$ 807,000
Options and restricted stock units authorized to grant | shares			1,200,000
Proceeds from the exercise of stock options | $			$ 3,888,000	$ 5,089,000	$ 3,054,000
Tax deposits on behalf of employees in exchange for common shares withheld upon vesting | $			$ 1,940,000	$ 767,000	$ 409,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage, year one			20.00%
Vesting percentage, year two			20.00%
Vesting percentage, year three			20.00%
Vesting percentage, year four			20.00%
Vesting percentage, year five			20.00%
Weighted average grant date fair value of options granted | $ / shares			$ 9.05	$ 8.49	$ 10.95
Dividend yield			2.90%	2.50%	2.30%
Expected volatility			15.50%	16.10%	17.70%
Expected life (in years)			5 years	5 years	5 years
Risk-free interest rate			1.10%	1.40%	1.70%
Stock options expense | $			$ 282,000	$ 261,000	$ 1,100,000
Unamortized compensation expense | $			$ 566,000
Weighted average recognized period of unamortized compensation expenses (in years)			3 years 6 months
Exercise of stock options, shares | shares			68,019	99,178	61,273
Aggregate intrinsic value of the stock options exercised | $			$ 3,400,000	$ 2,600,000	$ 2,100,000
Number of Options, Exercised | shares			68,019	99,178	61,273
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			5 years
Vesting percentage, year one			20.00%
Vesting percentage, year two			20.00%
Vesting percentage, year three			20.00%
Vesting percentage, year four			20.00%
Vesting percentage, year five			20.00%
Restricted stock units granted | shares			119,950	75,606	6,800
Weighted average grant date fair value of stock granted | $ / shares			$ 87.45	$ 82.78	$ 81.47
Restricted stock units expense | $			$ 10,300,000	$ 8,700,000	$ 8,000,000
Unamortized compensation expense | $			$ 12,600,000
Weighted average recognized period of unamortized compensation expenses (in years)			3 years 8 months 12 days
Number of units issued | shares			28,046	15,734	8,066
Number of units vested | shares			47,779	25,384	12,980
Aggregate fair value of the shares vested | $			$ 4,700,000	$ 2,000,000	$ 1,100,000
Shares applied to payroll taxes | shares			19,733	9,650	4,914
Restricted Stock Granted Prior To 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			6 years
Vesting percentage, year one			0.00%
Vesting percentage, year two			20.00%
Vesting percentage, year three			20.00%
Vesting percentage, year four			20.00%
Vesting percentage, year five			20.00%
Vesting percentage, year six			20.00%
Special Cash Dividend [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options expense | $					$ 644,000
2003 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares covered under Stock Option and Incentive Plan | shares			1,500,000
Vesting period (in years)			5 years
Expiration period (in years)			10 years
2012 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares covered under Stock Option and Incentive Plan | shares			1,000,000
Vesting period (in years)			5 years
Expiration period (in years)			10 years
2014 Performance-Based Restricted Stock Unit Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted | shares			99,150	66,506
Weighted average grant date fair value of stock granted | $ / shares			$ 83.59	$ 83.47
Number of defined targets to achieve for restricted stock unit awards, maximum | item			3
Number of defined targets to achieve for restricted stock unit awards, minimum | item			1
Length of Restricted Stock Unit program (in years)			4 years
Number of annual vesting installments | item			4
Approximate number of restricted stock units granted per year, maximum | shares			99,150
Maximum shares for cumulative four-year period | shares			92,900
Compensation expense | $			$ 9,800,000	$ 8,200,000	7,400,000
2014 Performance-Based Restricted Stock Unit Program [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense | $			2,000,000
Retirement Plan For Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense | $			339,000	316,000	550,000
Unamortized compensation expense | $			$ 887,000	$ 1,200,000	$ 1,500,000
Number of units issued | shares			8,000	0	0
Share based compensation expense due to increase in maximum shares | $					$ 243,000
Shares approved for issuance | shares			130,000
Number of shares granted for each year served | shares			1,000
Maximum number of shares issued upon retirement | shares			8,000
Aggregate fair value of shares issued | $	$ 775,000

Stock Compensation (Summary Of

Stock Compensation (Summary Of Stock Options Activity) (Details) - Stock Options [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Outstanding beginning balance	258,674	341,852	380,773
Number of Options, Granted	39,000	16,000	16,000
Number of Options, Exercised	(68,019)	(99,178)	(61,273)
Number of Options, Forfeited			(4,000)
Number of options, Special dividend adjustment			10,352
Number of Options, Outstanding ending balance	229,655	258,674	341,852
Number of Options, Exercisable at December 31, 2016	153,432
Weighted Average Exercise Price, Outstanding beginning balance	$ 60.76	$ 57.11	$ 56.45
Weighted Average Exercise Price, Granted	102.58	80.13	82.84
Weighted Average Exercise Price, Exercised	57.17	51.31	49.84
Weighted Average Exercise Price, Forfeited			52.35
Weighted Average Exercise Price, Special dividend adjustment
Weighted Average Exercise Price, Outstanding ending balance	68.93	$ 60.76	$ 57.11
Weighted Average Exercise Price, Exercisable at December 31, 2016	$ 58.63
Weighted Average Remaining Contract Life, Outstanding at December 31, 2016	5 years 4 months 6 days
Weighted Average Remaining Contract Life, Exercisable at December 31, 2016	3 years 11 months 1 day
Aggregate Intrinsic Value, Outstanding at December 31, 2016	$ 10,930
Aggregate Intrinsic Value, Exercisable at December 31, 2016	$ 8,882

Stock Compensation (Nonvested R

Stock Compensation (Nonvested Restricted Stock Units) (Details) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Units, Nonvested beginning balance	78,652	35,170	45,100
Number of Units, Granted	119,950	75,606	6,800
Number of Units, Vested	(47,779)	(25,384)	(12,980)
Number of Units, Forfeited	(6,130)	(6,740)	(3,750)
Number of Units, Nonvested ending balance	144,693	78,652	35,170
Weighted Average Grant Date Fair Value, Nonvested beginning balance	$ 78.44	$ 65.62	$ 60.07
Weighted Average Grant Date Fair Value, Granted	87.45	82.78	81.47
Weighted Average Grant Date Fair Value, Vested	80.45	74.19	53.65
Weighted Average Grant Date Fair Value, Forfeited	76.51	76.22	69
Weighted Average Grant Date Fair Value, Nonvested ending balance	$ 58.56	$ 78.44	$ 65.62

Supplementary Quarterly Finan49

Supplementary Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplementary Quarterly Financial Data [Abstract]
Rental income	$ 97,599	$ 97,340	$ 96,087	$ 95,845	$ 94,550	$ 93,322	$ 92,948	$ 92,315	$ 386,871	$ 373,135	$ 376,255
Cost of operations	30,668	30,796	29,750	31,894	28,973	30,448	30,057	31,746	123,108	121,224	127,371
Net income allocable to common shareholders	$ 12,854	$ 19,718	$ 15,731	$ 14,569	$ 14,906	$ 22,484	$ 11,129	$ 19,771	$ 62,872	$ 68,291	$ 113,154
Net income per share: Basic	$ 0.47	$ 0.73	$ 0.58	$ 0.54	$ 0.55	$ 0.83	$ 0.41	$ 0.73	$ 2.32	$ 2.53	$ 4.21
Net income per share: Diluted	$ 0.47	$ 0.72	$ 0.58	$ 0.54	$ 0.55	$ 0.83	$ 0.41	$ 0.73	$ 2.31	$ 2.52	$ 4.19

401(k) Plan (Details)

401(k) Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock Compensation [Abstract]
Matching contributions by employer, percentage	4.00%
Expenses related to 401(k) savings plan	$ 409,000	$ 410,000	$ 417,000

Real Estate And Accumulated D51

Real Estate And Accumulated Depreciation (Real Estate And Accumulated Depreciation) (Details) ft² in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2016USD ($)ft²property	Sep. 28, 2016ft²
Real Estate and Accumulated Depreciation [Line Items]
Square Feet | ft²		28,072
Initial Cost to Company, Land		$ 789,531
Initial Cost to Company, Buildings and Improvements		1,716,799
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		510,082
Gross Amount at Which Carried at December 31, 2016, Land		789,531
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		2,226,881
Gross Amount at Which Carried at December 31, 2016, Total		3,016,412
Accumulated Depreciation		$ 1,159,808
Number of properties subject to ground leases | property		2
Las Colinas Lease Expiring In 2019 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ground leases expiration, extension option period (in years)		10 years
Las Colinas Lease Expiring In 2020 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ground leases expiration, extension option period (in years)		10 years
Buena Park Industrial Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Buena Park, CA
Square Feet | ft²		317
Initial Cost to Company, Land		$ 3,245
Initial Cost to Company, Buildings and Improvements		7,703
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		2,715
Gross Amount at Which Carried at December 31, 2016, Land		3,245
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		10,418
Gross Amount at Which Carried at December 31, 2016, Total		13,663
Accumulated Depreciation		$ 7,047
Year(s) Acquired		1,997
Carson [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Carson, CA
Square Feet | ft²		77
Initial Cost to Company, Land		$ 990
Initial Cost to Company, Buildings and Improvements		2,496
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		1,537
Gross Amount at Which Carried at December 31, 2016, Land		990
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		4,033
Gross Amount at Which Carried at December 31, 2016, Total		5,023
Accumulated Depreciation		$ 2,867
Year(s) Acquired		1,997
Cerritos Business Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Cerritos, CA
Square Feet | ft²		395
Initial Cost to Company, Land		$ 4,218
Initial Cost to Company, Buildings and Improvements		10,273
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		4,139
Gross Amount at Which Carried at December 31, 2016, Land		4,218
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		14,412
Gross Amount at Which Carried at December 31, 2016, Total		18,630
Accumulated Depreciation		$ 9,960
Year(s) Acquired		1,997
Cerritos/Edwards [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Cerritos, CA
Square Feet | ft²		31
Initial Cost to Company, Land		$ 450
Initial Cost to Company, Buildings and Improvements		1,217
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		1,421
Gross Amount at Which Carried at December 31, 2016, Land		450
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		2,638
Gross Amount at Which Carried at December 31, 2016, Total		3,088
Accumulated Depreciation		$ 1,946
Year(s) Acquired		1,997
Concord Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Concord, CA
Square Feet | ft²		246
Initial Cost to Company, Land		$ 12,454
Initial Cost to Company, Buildings and Improvements		20,491
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		1,027
Gross Amount at Which Carried at December 31, 2016, Land		12,454
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		21,518
Gross Amount at Which Carried at December 31, 2016, Total		33,972
Accumulated Depreciation		$ 5,070
Year(s) Acquired		2,011
Culver City [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Culver City, CA
Square Feet | ft²		147
Initial Cost to Company, Land		$ 3,252
Initial Cost to Company, Buildings and Improvements		8,157
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		6,031
Gross Amount at Which Carried at December 31, 2016, Land		3,252
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		14,188
Gross Amount at Which Carried at December 31, 2016, Total		17,440
Accumulated Depreciation		$ 10,468
Year(s) Acquired		1,997
Bayview Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Fremont, CA
Square Feet | ft²		104
Initial Cost to Company, Land		$ 4,990
Initial Cost to Company, Buildings and Improvements		4,831
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		328
Gross Amount at Which Carried at December 31, 2016, Land		4,990
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		5,159
Gross Amount at Which Carried at December 31, 2016, Total		10,149
Accumulated Depreciation		$ 1,509
Year(s) Acquired		2,011
Christy Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Fremont, CA
Square Feet | ft²		334
Initial Cost to Company, Land		$ 11,451
Initial Cost to Company, Buildings and Improvements		16,254
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		1,586
Gross Amount at Which Carried at December 31, 2016, Land		11,451
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		17,840
Gross Amount at Which Carried at December 31, 2016, Total		29,291
Accumulated Depreciation		$ 5,030
Year(s) Acquired		2,011
Industrial Drive Distribution Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Fremont, CA
Square Feet | ft²		199
Initial Cost to Company, Land		$ 7,482
Initial Cost to Company, Buildings and Improvements		6,812
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		798
Gross Amount at Which Carried at December 31, 2016, Land		7,482
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		7,610
Gross Amount at Which Carried at December 31, 2016, Total		15,092
Accumulated Depreciation		$ 1,820
Year(s) Acquired		2,011
Bay Center Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Hayward, CA
Square Feet | ft²		463
Initial Cost to Company, Land		$ 19,052
Initial Cost to Company, Buildings and Improvements		50,501
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		3,702
Gross Amount at Which Carried at December 31, 2016, Land		19,052
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		54,203
Gross Amount at Which Carried at December 31, 2016, Total		73,255
Accumulated Depreciation		$ 12,659
Year(s) Acquired		2,011
Cabot Distribution Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Hayward, CA
Square Feet | ft²		249
Initial Cost to Company, Land		$ 5,859
Initial Cost to Company, Buildings and Improvements		10,811
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		374
Gross Amount at Which Carried at December 31, 2016, Land		5,859
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		11,185
Gross Amount at Which Carried at December 31, 2016, Total		17,044
Accumulated Depreciation		$ 2,528
Year(s) Acquired		2,011
Diablo Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Hayward, CA
Square Feet | ft²		271
Initial Cost to Company, Land		$ 9,102
Initial Cost to Company, Buildings and Improvements		15,721
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		863
Gross Amount at Which Carried at December 31, 2016, Land		9,102
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		16,584
Gross Amount at Which Carried at December 31, 2016, Total		25,686
Accumulated Depreciation		$ 3,978
Year(s) Acquired		2,011
Eden Landing [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Hayward, CA
Square Feet | ft²		83
Initial Cost to Company, Land		$ 3,275
Initial Cost to Company, Buildings and Improvements		6,174
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		131
Gross Amount at Which Carried at December 31, 2016, Land		3,275
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		6,305
Gross Amount at Which Carried at December 31, 2016, Total		9,580
Accumulated Depreciation		$ 1,569
Year(s) Acquired		2,011
Hayward Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Hayward, CA
Square Feet | ft²		1,091
Initial Cost to Company, Land		$ 28,256
Initial Cost to Company, Buildings and Improvements		54,418
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		2,807
Gross Amount at Which Carried at December 31, 2016, Land		28,256
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		57,225
Gross Amount at Which Carried at December 31, 2016, Total		85,481
Accumulated Depreciation		$ 13,205
Year(s) Acquired		2,011
Huntwood Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Hayward, CA
Square Feet | ft²		176
Initial Cost to Company, Land		$ 7,391
Initial Cost to Company, Buildings and Improvements		11,819
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		889
Gross Amount at Which Carried at December 31, 2016, Land		7,391
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		12,708
Gross Amount at Which Carried at December 31, 2016, Total		20,099
Accumulated Depreciation		$ 3,327
Year(s) Acquired		2,011
Parkway Commerce [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Hayward, CA
Square Feet | ft²		407
Initial Cost to Company, Land		$ 4,398
Initial Cost to Company, Buildings and Improvements		10,433
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		4,222
Gross Amount at Which Carried at December 31, 2016, Land		4,398
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		14,655
Gross Amount at Which Carried at December 31, 2016, Total		19,053
Accumulated Depreciation		$ 9,816
Year(s) Acquired		1,997
Corporate Pointe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Irvine, CA
Square Feet | ft²		161
Initial Cost to Company, Land		$ 6,876
Initial Cost to Company, Buildings and Improvements		18,519
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		6,760
Gross Amount at Which Carried at December 31, 2016, Land		6,876
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		25,279
Gross Amount at Which Carried at December 31, 2016, Total		32,155
Accumulated Depreciation		$ 17,027
Year(s) Acquired		2,000
Laguna Hills Commerce Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Laguna Hills, CA
Square Feet | ft²		513
Initial Cost to Company, Land		$ 16,261
Initial Cost to Company, Buildings and Improvements		39,559
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		7,317
Gross Amount at Which Carried at December 31, 2016, Land		16,261
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		46,876
Gross Amount at Which Carried at December 31, 2016, Total		63,137
Accumulated Depreciation		$ 30,670
Year(s) Acquired		1,997
Plaza Del Lago [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Laguna Hills, CA
Square Feet | ft²		101
Initial Cost to Company, Land		$ 2,037
Initial Cost to Company, Buildings and Improvements		5,051
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		4,060
Gross Amount at Which Carried at December 31, 2016, Land		2,037
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		9,111
Gross Amount at Which Carried at December 31, 2016, Total		11,148
Accumulated Depreciation		$ 6,473
Year(s) Acquired		1,997
Canada Business Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Lake Forest, CA
Square Feet | ft²		297
Initial Cost to Company, Land		$ 5,508
Initial Cost to Company, Buildings and Improvements		13,785
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		6,031
Gross Amount at Which Carried at December 31, 2016, Land		5,508
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		19,816
Gross Amount at Which Carried at December 31, 2016, Total		25,324
Accumulated Depreciation		$ 13,319
Year(s) Acquired		1,997
Dixon Landing Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Milpitas, CA
Square Feet | ft²		505
Initial Cost to Company, Land		$ 26,301
Initial Cost to Company, Buildings and Improvements		21,121
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		3,244
Gross Amount at Which Carried at December 31, 2016, Land		26,301
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		24,365
Gross Amount at Which Carried at December 31, 2016, Total		50,666
Accumulated Depreciation		$ 6,953
Year(s) Acquired		2,011
Monterey/Calle [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Monterey, CA
Square Feet | ft²		12
Initial Cost to Company, Land		$ 288
Initial Cost to Company, Buildings and Improvements		706
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		337
Gross Amount at Which Carried at December 31, 2016, Land		288
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		1,043
Gross Amount at Which Carried at December 31, 2016, Total		1,331
Accumulated Depreciation		$ 763
Year(s) Acquired		1,997
Monterey Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Monterey Park, CA
Square Feet | ft²		199
Initial Cost to Company, Land		$ 3,078
Initial Cost to Company, Buildings and Improvements		7,862
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		1,586
Gross Amount at Which Carried at December 31, 2016, Land		3,078
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		9,448
Gross Amount at Which Carried at December 31, 2016, Total		12,526
Accumulated Depreciation		$ 6,611
Year(s) Acquired		1,997
Port Of Oakland [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Oakland, CA
Square Feet | ft²		200
Initial Cost to Company, Land		$ 5,638
Initial Cost to Company, Buildings and Improvements		11,066
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		627
Gross Amount at Which Carried at December 31, 2016, Land		5,638
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		11,693
Gross Amount at Which Carried at December 31, 2016, Total		17,331
Accumulated Depreciation		$ 2,817
Year(s) Acquired		2,011
Orangewood [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Orange County, CA
Square Feet | ft²		107
Initial Cost to Company, Land		$ 2,637
Initial Cost to Company, Buildings and Improvements		12,291
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		3,873
Gross Amount at Which Carried at December 31, 2016, Land		2,637
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		16,164
Gross Amount at Which Carried at December 31, 2016, Total		18,801
Accumulated Depreciation		$ 9,072
Year(s) Acquired		2,003
Orange County Business Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Orange County, CA
Square Feet | ft²		437
Initial Cost to Company, Land		$ 9,405
Initial Cost to Company, Buildings and Improvements		35,746
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		18,507
Gross Amount at Which Carried at December 31, 2016, Land		9,405
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		54,253
Gross Amount at Which Carried at December 31, 2016, Total		63,658
Accumulated Depreciation		$ 40,977
Year(s) Acquired		2,003
Kearney Mesa [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		San Diego, CA
Square Feet | ft²		164
Initial Cost to Company, Land		$ 2,894
Initial Cost to Company, Buildings and Improvements		7,089
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		2,890
Gross Amount at Which Carried at December 31, 2016, Land		2,894
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		9,979
Gross Amount at Which Carried at December 31, 2016, Total		12,873
Accumulated Depreciation		$ 6,920
Year(s) Acquired		1,997
Lusk [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		San Diego, CA
Square Feet | ft²		371
Initial Cost to Company, Land		$ 5,711
Initial Cost to Company, Buildings and Improvements		14,049
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		5,623
Gross Amount at Which Carried at December 31, 2016, Land		5,711
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		19,672
Gross Amount at Which Carried at December 31, 2016, Total		25,383
Accumulated Depreciation		$ 13,645
Year(s) Acquired		1,997
Rose Canyon Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		San Diego, CA
Square Feet | ft²		233
Initial Cost to Company, Land		$ 15,129
Initial Cost to Company, Buildings and Improvements		20,054
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		2,321
Gross Amount at Which Carried at December 31, 2016, Land		15,129
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		22,375
Gross Amount at Which Carried at December 31, 2016, Total		37,504
Accumulated Depreciation		$ 12,005
Year(s) Acquired		2,005
Charcot Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		San Jose, CA
Square Feet | ft²		283
Initial Cost to Company, Land		$ 18,654
Initial Cost to Company, Buildings and Improvements		17,580
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		1,704
Gross Amount at Which Carried at December 31, 2016, Land		18,654
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		19,284
Gross Amount at Which Carried at December 31, 2016, Total		37,938
Accumulated Depreciation		$ 5,239
Year(s) Acquired		2011/2014
Las Plumas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		San Jose, CA
Square Feet | ft²		214
Initial Cost to Company, Land		$ 4,379
Initial Cost to Company, Buildings and Improvements		12,889
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		6,716
Gross Amount at Which Carried at December 31, 2016, Land		4,379
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		19,605
Gross Amount at Which Carried at December 31, 2016, Total		23,984
Accumulated Depreciation		$ 14,446
Year(s) Acquired		1,998
Little Orchard Distribution Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		San Jose, CA
Square Feet | ft²		213
Initial Cost to Company, Land		$ 7,725
Initial Cost to Company, Buildings and Improvements		3,846
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		84
Gross Amount at Which Carried at December 31, 2016, Land		7,725
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		3,930
Gross Amount at Which Carried at December 31, 2016, Total		11,655
Accumulated Depreciation		$ 1,241
Year(s) Acquired		2,011
Montague Industrial Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		San Jose, CA
Square Feet | ft²		316
Initial Cost to Company, Land		$ 14,476
Initial Cost to Company, Buildings and Improvements		12,807
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		485
Gross Amount at Which Carried at December 31, 2016, Land		14,476
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		13,292
Gross Amount at Which Carried at December 31, 2016, Total		27,768
Accumulated Depreciation		$ 4,334
Year(s) Acquired		2,011
Oakland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		San Jose, CA
Square Feet | ft²		177
Initial Cost to Company, Land		$ 3,458
Initial Cost to Company, Buildings and Improvements		8,765
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		3,233
Gross Amount at Which Carried at December 31, 2016, Land		3,458
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		11,998
Gross Amount at Which Carried at December 31, 2016, Total		15,456
Accumulated Depreciation		$ 8,267
Year(s) Acquired		1,997
Rogers Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		San Jose, CA
Square Feet | ft²		67
Initial Cost to Company, Land		$ 3,540
Initial Cost to Company, Buildings and Improvements		4,896
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		630
Gross Amount at Which Carried at December 31, 2016, Land		3,540
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		5,526
Gross Amount at Which Carried at December 31, 2016, Total		9,066
Accumulated Depreciation		$ 2,659
Year(s) Acquired		2,006
Doolittle Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		San Leandro, CA
Square Feet | ft²		113
Initial Cost to Company, Land		$ 3,929
Initial Cost to Company, Buildings and Improvements		6,231
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		413
Gross Amount at Which Carried at December 31, 2016, Land		3,929
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		6,644
Gross Amount at Which Carried at December 31, 2016, Total		10,573
Accumulated Depreciation		$ 1,775
Year(s) Acquired		2,011
Bayshore Corporate Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		San Mateo, CA
Square Feet | ft²		340
Initial Cost to Company, Land		$ 25,108
Initial Cost to Company, Buildings and Improvements		36,891
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		6,202
Gross Amount at Which Carried at December 31, 2016, Land		25,108
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		43,093
Gross Amount at Which Carried at December 31, 2016, Total		68,201
Accumulated Depreciation		$ 10,038
Year(s) Acquired		2,013
San Ramon/Norris Canyon [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		San Ramon, CA
Square Feet | ft²		52
Initial Cost to Company, Land		$ 1,486
Initial Cost to Company, Buildings and Improvements		3,642
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		1,348
Gross Amount at Which Carried at December 31, 2016, Land		1,486
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		4,990
Gross Amount at Which Carried at December 31, 2016, Total		6,476
Accumulated Depreciation		$ 3,385
Year(s) Acquired		1,997
Commerce Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Santa Clara, CA
Square Feet | ft²		251
Initial Cost to Company, Land		$ 17,218
Initial Cost to Company, Buildings and Improvements		21,914
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		3,733
Gross Amount at Which Carried at December 31, 2016, Land		17,218
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		25,647
Gross Amount at Which Carried at December 31, 2016, Total		42,865
Accumulated Depreciation		$ 15,900
Year(s) Acquired		2,007
Santa Clara Tech Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Santa Clara, CA
Square Feet | ft²		178
Initial Cost to Company, Land		$ 7,673
Initial Cost to Company, Buildings and Improvements		15,645
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		4,514
Gross Amount at Which Carried at December 31, 2016, Land		7,673
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		20,159
Gross Amount at Which Carried at December 31, 2016, Total		27,832
Accumulated Depreciation		$ 13,468
Year(s) Acquired		2,000
Walsh At Lafayette [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Santa Clara, CA
Square Feet | ft²		321
Initial Cost to Company, Land		$ 13,439
Initial Cost to Company, Buildings and Improvements		17,890
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		281
Gross Amount at Which Carried at December 31, 2016, Land		13,439
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		18,171
Gross Amount at Which Carried at December 31, 2016, Total		31,610
Accumulated Depreciation		$ 5,151
Year(s) Acquired		2,011
Signal Hill [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Signal Hill, CA
Square Feet | ft²		269
Initial Cost to Company, Land		$ 6,693
Initial Cost to Company, Buildings and Improvements		12,699
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		2,695
Gross Amount at Which Carried at December 31, 2016, Land		6,693
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		15,394
Gross Amount at Which Carried at December 31, 2016, Total		22,087
Accumulated Depreciation		$ 9,169
Year(s) Acquired		1997/2006
Airport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		So San Francisco, CA
Square Feet | ft²		52
Initial Cost to Company, Land		$ 899
Initial Cost to Company, Buildings and Improvements		2,387
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		745
Gross Amount at Which Carried at December 31, 2016, Land		899
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		3,132
Gross Amount at Which Carried at December 31, 2016, Total		4,031
Accumulated Depreciation		$ 2,131
Year(s) Acquired		1,997
South San Francisco/Produce [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		So San Francisco, CA
Square Feet | ft²		41
Initial Cost to Company, Land		$ 776
Initial Cost to Company, Buildings and Improvements		1,886
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		553
Gross Amount at Which Carried at December 31, 2016, Land		776
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		2,439
Gross Amount at Which Carried at December 31, 2016, Total		3,215
Accumulated Depreciation		$ 1,632
Year(s) Acquired		1,997
Studio City/Ventura [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Studio City, CA
Square Feet | ft²		22
Initial Cost to Company, Land		$ 621
Initial Cost to Company, Buildings and Improvements		1,530
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		589
Gross Amount at Which Carried at December 31, 2016, Land		621
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		2,119
Gross Amount at Which Carried at December 31, 2016, Total		2,740
Accumulated Depreciation		$ 1,420
Year(s) Acquired		1,997
Kifer Industrial Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Sunnyvale, CA
Square Feet | ft²		287
Initial Cost to Company, Land		$ 13,227
Initial Cost to Company, Buildings and Improvements		37,874
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		1,369
Gross Amount at Which Carried at December 31, 2016, Land		13,227
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		39,243
Gross Amount at Which Carried at December 31, 2016, Total		52,470
Accumulated Depreciation		$ 9,001
Year(s) Acquired		2,011
Torrance [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Torrance, CA
Square Feet | ft²		147
Initial Cost to Company, Land		$ 2,318
Initial Cost to Company, Buildings and Improvements		6,069
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		3,263
Gross Amount at Which Carried at December 31, 2016, Land		2,318
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		9,332
Gross Amount at Which Carried at December 31, 2016, Total		11,650
Accumulated Depreciation		$ 6,636
Year(s) Acquired		1,997
Boca Commerce [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Boca Raton, FL
Square Feet | ft²		135
Initial Cost to Company, Land		$ 7,795
Initial Cost to Company, Buildings and Improvements		9,258
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		3,056
Gross Amount at Which Carried at December 31, 2016, Land		7,795
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		12,314
Gross Amount at Which Carried at December 31, 2016, Total		20,109
Accumulated Depreciation		$ 4,550
Year(s) Acquired		2,006
MICC [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Miami, FL
Square Feet | ft²		3,468
Initial Cost to Company, Land		$ 95,115
Initial Cost to Company, Buildings and Improvements		112,583
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		40,445
Gross Amount at Which Carried at December 31, 2016, Land		95,115
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		153,028
Gross Amount at Which Carried at December 31, 2016, Total		248,143
Accumulated Depreciation		$ 87,812
Year(s) Acquired		2003/2011/2014
Wellington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Wellington, FL
Square Feet | ft²		263
Initial Cost to Company, Land		$ 10,845
Initial Cost to Company, Buildings and Improvements		18,560
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		2,490
Gross Amount at Which Carried at December 31, 2016, Land		10,845
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		21,050
Gross Amount at Which Carried at December 31, 2016, Total		31,895
Accumulated Depreciation		$ 8,792
Year(s) Acquired		2,006
Ammendale [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Beltsville, MD
Square Feet | ft²		309
Initial Cost to Company, Land		$ 4,278
Initial Cost to Company, Buildings and Improvements		18,380
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		11,175
Gross Amount at Which Carried at December 31, 2016, Land		4,278
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		29,555
Gross Amount at Which Carried at December 31, 2016, Total		33,833
Accumulated Depreciation		$ 21,995
Year(s) Acquired		1,998
Gaithersburgh/Christopher [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Gaithersburg, MD
Square Feet | ft²		29
Initial Cost to Company, Land		$ 475
Initial Cost to Company, Buildings and Improvements		1,203
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		632
Gross Amount at Which Carried at December 31, 2016, Land		475
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		1,835
Gross Amount at Which Carried at December 31, 2016, Total		2,310
Accumulated Depreciation		$ 1,323
Year(s) Acquired		1,997
Metro Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Rockville, MD
Square Feet | ft²		898
Initial Cost to Company, Land		$ 33,995
Initial Cost to Company, Buildings and Improvements		94,463
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		40,692
Gross Amount at Which Carried at December 31, 2016, Land		33,995
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		135,155
Gross Amount at Which Carried at December 31, 2016, Total		169,150
Accumulated Depreciation		$ 87,175
Year(s) Acquired		2,001
Parklawn Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Rockville, MD
Square Feet | ft²		232
Initial Cost to Company, Land		$ 3,387
Initial Cost to Company, Buildings and Improvements		19,628
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		3,783
Gross Amount at Which Carried at December 31, 2016, Land		3,387
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		23,411
Gross Amount at Which Carried at December 31, 2016, Total		26,798
Accumulated Depreciation		$ 8,552
Year(s) Acquired		2,010
Shady Grove [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Rockville, MD
Square Feet | ft²		578	226
Initial Cost to Company, Land		$ 11,010
Initial Cost to Company, Buildings and Improvements		58,364
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		8,860
Gross Amount at Which Carried at December 31, 2016, Land		11,010
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		67,224
Gross Amount at Which Carried at December 31, 2016, Total		78,234
Accumulated Depreciation		$ 20,086
Year(s) Acquired		2010/2016
Westech Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Silver Spring, MD
Square Feet | ft²		532
Initial Cost to Company, Land		$ 25,261
Initial Cost to Company, Buildings and Improvements		74,572
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		17,232
Gross Amount at Which Carried at December 31, 2016, Land		25,261
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		91,804
Gross Amount at Which Carried at December 31, 2016, Total		117,065
Accumulated Depreciation		$ 53,912
Year(s) Acquired		2,006
Ben White [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Austin, TX
Square Feet | ft²		108
Initial Cost to Company, Land		$ 1,550
Initial Cost to Company, Buildings and Improvements		7,015
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		1,952
Gross Amount at Which Carried at December 31, 2016, Land		1,550
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		8,967
Gross Amount at Which Carried at December 31, 2016, Total		10,517
Accumulated Depreciation		$ 6,312
Year(s) Acquired		1,998
Lamar Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Austin, TX
Square Feet | ft²		198
Initial Cost to Company, Land		$ 2,528
Initial Cost to Company, Buildings and Improvements		6,596
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		6,043
Gross Amount at Which Carried at December 31, 2016, Land		2,528
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		12,639
Gross Amount at Which Carried at December 31, 2016, Total		15,167
Accumulated Depreciation		$ 9,498
Year(s) Acquired		1,997
McKalla [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Austin, TX
Square Feet | ft²		236
Initial Cost to Company, Land		$ 1,945
Initial Cost to Company, Buildings and Improvements		13,212
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		2,188
Gross Amount at Which Carried at December 31, 2016, Land		1,945
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		15,400
Gross Amount at Which Carried at December 31, 2016, Total		17,345
Accumulated Depreciation		$ 7,563
Year(s) Acquired		1998/2012
McNeil [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Austin, TX
Square Feet | ft²		525
Initial Cost to Company, Land		$ 5,477
Initial Cost to Company, Buildings and Improvements		24,495
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		4,513
Gross Amount at Which Carried at December 31, 2016, Land		5,477
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		29,008
Gross Amount at Which Carried at December 31, 2016, Total		34,485
Accumulated Depreciation		$ 10,425
Year(s) Acquired		1999/2010/2012/2014
Rutland [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Austin, TX
Square Feet | ft²		235
Initial Cost to Company, Land		$ 2,022
Initial Cost to Company, Buildings and Improvements		9,397
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		2,160
Gross Amount at Which Carried at December 31, 2016, Land		2,022
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		11,557
Gross Amount at Which Carried at December 31, 2016, Total		13,579
Accumulated Depreciation		$ 8,017
Year(s) Acquired		1998/1999
Waterford [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Austin, TX
Square Feet | ft²		106
Initial Cost to Company, Land		$ 2,108
Initial Cost to Company, Buildings and Improvements		9,649
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		3,823
Gross Amount at Which Carried at December 31, 2016, Land		2,108
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		13,472
Gross Amount at Which Carried at December 31, 2016, Total		15,580
Accumulated Depreciation		$ 9,215
Year(s) Acquired		1,999
Braker Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Austin, TX
Square Feet | ft²		257
Initial Cost to Company, Land		$ 1,874
Initial Cost to Company, Buildings and Improvements		13,990
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		1,723
Gross Amount at Which Carried at December 31, 2016, Land		1,874
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		15,713
Gross Amount at Which Carried at December 31, 2016, Total		17,587
Accumulated Depreciation		$ 6,327
Year(s) Acquired		2,010
Mopac Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Austin, TX
Square Feet | ft²		117
Initial Cost to Company, Land		$ 719
Initial Cost to Company, Buildings and Improvements		3,579
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		694
Gross Amount at Which Carried at December 31, 2016, Land		719
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		4,273
Gross Amount at Which Carried at December 31, 2016, Total		4,992
Accumulated Depreciation		$ 1,661
Year(s) Acquired		2,010
Southpark Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Austin, TX
Square Feet | ft²		181
Initial Cost to Company, Land		$ 1,266
Initial Cost to Company, Buildings and Improvements		9,882
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		2,361
Gross Amount at Which Carried at December 31, 2016, Land		1,266
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		12,243
Gross Amount at Which Carried at December 31, 2016, Total		13,509
Accumulated Depreciation		$ 5,109
Year(s) Acquired		2,010
Valwood Business Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Carrolton, TX
Square Feet | ft²		356
Initial Cost to Company, Land		$ 2,510
Initial Cost to Company, Buildings and Improvements		13,859
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		1,916
Gross Amount at Which Carried at December 31, 2016, Land		2,510
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		15,775
Gross Amount at Which Carried at December 31, 2016, Total		18,285
Accumulated Depreciation		$ 4,060
Year(s) Acquired		2,013
Empire Commerce [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Dallas, TX
Square Feet | ft²		44
Initial Cost to Company, Land		$ 304
Initial Cost to Company, Buildings and Improvements		1,545
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		814
Gross Amount at Which Carried at December 31, 2016, Land		304
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		2,359
Gross Amount at Which Carried at December 31, 2016, Total		2,663
Accumulated Depreciation		$ 1,754
Year(s) Acquired		1,998
Northgate [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Dallas, TX
Square Feet | ft²		194
Initial Cost to Company, Land		$ 1,274
Initial Cost to Company, Buildings and Improvements		5,505
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		4,112
Gross Amount at Which Carried at December 31, 2016, Land		1,274
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		9,617
Gross Amount at Which Carried at December 31, 2016, Total		10,891
Accumulated Depreciation		$ 6,893
Year(s) Acquired		1,998
Northway Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Farmers Branch, TX
Square Feet | ft²		131
Initial Cost to Company, Land		$ 1,742
Initial Cost to Company, Buildings and Improvements		4,503
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		791
Gross Amount at Which Carried at December 31, 2016, Land		1,742
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		5,294
Gross Amount at Which Carried at December 31, 2016, Total		7,036
Accumulated Depreciation		$ 1,352
Year(s) Acquired		2,013
Springlake Business Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Farmers Branch, TX
Square Feet | ft²		206
Initial Cost to Company, Land		$ 2,607
Initial Cost to Company, Buildings and Improvements		5,715
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		1,861
Gross Amount at Which Carried at December 31, 2016, Land		2,607
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		7,576
Gross Amount at Which Carried at December 31, 2016, Total		10,183
Accumulated Depreciation		$ 2,020
Year(s) Acquired		2013/2014
Westwood Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Farmers Branch, TX
Square Feet | ft²		112
Initial Cost to Company, Land		$ 941
Initial Cost to Company, Buildings and Improvements		6,884
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		2,289
Gross Amount at Which Carried at December 31, 2016, Land		941
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		9,173
Gross Amount at Which Carried at December 31, 2016, Total		10,114
Accumulated Depreciation		$ 5,486
Year(s) Acquired		2,003
Eastgate [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Garland, TX
Square Feet | ft²		36
Initial Cost to Company, Land		$ 480
Initial Cost to Company, Buildings and Improvements		1,203
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		479
Gross Amount at Which Carried at December 31, 2016, Land		480
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		1,682
Gross Amount at Which Carried at December 31, 2016, Total		2,162
Accumulated Depreciation		$ 1,212
Year(s) Acquired		1,997
Freeport Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Irving, TX
Square Feet | ft²		256
Initial Cost to Company, Land		$ 4,564
Initial Cost to Company, Buildings and Improvements		9,506
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		2,348
Gross Amount at Which Carried at December 31, 2016, Land		4,564
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		11,854
Gross Amount at Which Carried at December 31, 2016, Total		16,418
Accumulated Depreciation		$ 2,920
Year(s) Acquired		2,013
NFTZ [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location	[1]	Irving, TX
Square Feet | ft²	[1]	231
Initial Cost to Company, Land	[1]	$ 1,517
Initial Cost to Company, Buildings and Improvements	[1]	6,499
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements	[1]	3,506
Gross Amount at Which Carried at December 31, 2016, Land	[1]	1,517
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements	[1]	10,005
Gross Amount at Which Carried at December 31, 2016, Total	[1]	11,522
Accumulated Depreciation	[1]	$ 6,997
Year(s) Acquired	[1]	1,998
Royal Tech [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Irving, TX
Square Feet | ft²		794
Initial Cost to Company, Land		$ 13,989
Initial Cost to Company, Buildings and Improvements		54,113
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		23,889
Gross Amount at Which Carried at December 31, 2016, Land		13,989
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		78,002
Gross Amount at Which Carried at December 31, 2016, Total		91,991
Accumulated Depreciation		$ 50,291
Year(s) Acquired		1998-2000/2011
La Prada [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Mesquite, TX
Square Feet | ft²		56
Initial Cost to Company, Land		$ 495
Initial Cost to Company, Buildings and Improvements		1,235
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		594
Gross Amount at Which Carried at December 31, 2016, Land		495
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		1,829
Gross Amount at Which Carried at December 31, 2016, Total		2,324
Accumulated Depreciation		$ 1,355
Year(s) Acquired		1,997
The Summit [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Plano, TX
Square Feet | ft²		184
Initial Cost to Company, Land		$ 1,536
Initial Cost to Company, Buildings and Improvements		6,654
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		4,291
Gross Amount at Which Carried at December 31, 2016, Land		1,536
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		10,945
Gross Amount at Which Carried at December 31, 2016, Total		12,481
Accumulated Depreciation		$ 8,140
Year(s) Acquired		1,998
Arapaho Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Richardson, TX
Square Feet | ft²		408
Initial Cost to Company, Land		$ 5,226
Initial Cost to Company, Buildings and Improvements		10,661
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		3,394
Gross Amount at Which Carried at December 31, 2016, Land		5,226
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		14,055
Gross Amount at Which Carried at December 31, 2016, Total		19,281
Accumulated Depreciation		$ 4,371
Year(s) Acquired		2013/2014
Richardson Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Richardson, TX
Square Feet | ft²		117
Initial Cost to Company, Land		$ 799
Initial Cost to Company, Buildings and Improvements		3,568
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		2,954
Gross Amount at Which Carried at December 31, 2016, Land		799
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		6,522
Gross Amount at Which Carried at December 31, 2016, Total		7,321
Accumulated Depreciation		$ 4,834
Year(s) Acquired		1,998
Bren Mar [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Alexandria, VA
Square Feet | ft²		113
Initial Cost to Company, Land		$ 2,197
Initial Cost to Company, Buildings and Improvements		5,380
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		3,832
Gross Amount at Which Carried at December 31, 2016, Land		2,197
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		9,212
Gross Amount at Which Carried at December 31, 2016, Total		11,409
Accumulated Depreciation		$ 6,754
Year(s) Acquired		1,997
Eisenhower [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Alexandria, VA
Square Feet | ft²		95
Initial Cost to Company, Land		$ 1,440
Initial Cost to Company, Buildings and Improvements		3,635
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		2,486
Gross Amount at Which Carried at December 31, 2016, Land		1,440
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		6,121
Gross Amount at Which Carried at December 31, 2016, Total		7,561
Accumulated Depreciation		$ 4,610
Year(s) Acquired		1,997
Beaumont [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Chantilly, VA
Square Feet | ft²		107
Initial Cost to Company, Land		$ 4,736
Initial Cost to Company, Buildings and Improvements		11,051
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		2,238
Gross Amount at Which Carried at December 31, 2016, Land		4,736
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		13,289
Gross Amount at Which Carried at December 31, 2016, Total		18,025
Accumulated Depreciation		$ 7,419
Year(s) Acquired		2,006
Dulles South/Sullyfield [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Chantilly, VA
Square Feet | ft²		99
Initial Cost to Company, Land		$ 1,373
Initial Cost to Company, Buildings and Improvements		6,810
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		3,135
Gross Amount at Which Carried at December 31, 2016, Land		1,373
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		9,945
Gross Amount at Which Carried at December 31, 2016, Total		11,318
Accumulated Depreciation		$ 6,756
Year(s) Acquired		1,999
Lafayette [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Chantilly, VA
Square Feet | ft²		197
Initial Cost to Company, Land		$ 1,680
Initial Cost to Company, Buildings and Improvements		13,398
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		5,381
Gross Amount at Which Carried at December 31, 2016, Land		1,680
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		18,779
Gross Amount at Which Carried at December 31, 2016, Total		20,459
Accumulated Depreciation		$ 12,790
Year(s) Acquired		1999/2000
Park East [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Chantilly, VA
Square Feet | ft²		198
Initial Cost to Company, Land		$ 3,851
Initial Cost to Company, Buildings and Improvements		18,029
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		10,270
Gross Amount at Which Carried at December 31, 2016, Land		3,851
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		28,299
Gross Amount at Which Carried at December 31, 2016, Total		32,150
Accumulated Depreciation		$ 19,339
Year(s) Acquired		1,999
Fair Oaks Business Campus [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Fairfax, VA
Square Feet | ft²		290
Initial Cost to Company, Land		$ 13,598
Initial Cost to Company, Buildings and Improvements		36,232
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		8,132
Gross Amount at Which Carried at December 31, 2016, Land		13,598
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		44,364
Gross Amount at Which Carried at December 31, 2016, Total		57,962
Accumulated Depreciation		$ 25,358
Year(s) Acquired		2004/2007
Monroe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Herndon, VA
Square Feet | ft²		244
Initial Cost to Company, Land		$ 6,737
Initial Cost to Company, Buildings and Improvements		18,911
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		11,274
Gross Amount at Which Carried at December 31, 2016, Land		6,737
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		30,185
Gross Amount at Which Carried at December 31, 2016, Total		36,922
Accumulated Depreciation		$ 21,005
Year(s) Acquired		1997/1999
Gunston [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Lorton, VA
Square Feet | ft²		247
Initial Cost to Company, Land		$ 4,146
Initial Cost to Company, Buildings and Improvements		17,872
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		11,221
Gross Amount at Which Carried at December 31, 2016, Land		4,146
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		29,093
Gross Amount at Which Carried at December 31, 2016, Total		33,239
Accumulated Depreciation		$ 16,313
Year(s) Acquired		1,998
The Mile [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		McLean, VA
Square Feet | ft²		628
Initial Cost to Company, Land		$ 38,279
Initial Cost to Company, Buildings and Improvements		83,596
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		22,340
Gross Amount at Which Carried at December 31, 2016, Land		38,279
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		105,936
Gross Amount at Which Carried at December 31, 2016, Total		144,215
Accumulated Depreciation		$ 37,304
Year(s) Acquired		2010/2011
Prosperity Business Campus [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Merrifield, VA
Square Feet | ft²		659
Initial Cost to Company, Land		$ 23,147
Initial Cost to Company, Buildings and Improvements		67,575
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		31,491
Gross Amount at Which Carried at December 31, 2016, Land		23,147
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		99,066
Gross Amount at Which Carried at December 31, 2016, Total		122,213
Accumulated Depreciation		$ 63,020
Year(s) Acquired		2,001
Alban Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Springfield, VA
Square Feet | ft²		150
Initial Cost to Company, Land		$ 1,935
Initial Cost to Company, Buildings and Improvements		4,736
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		5,050
Gross Amount at Which Carried at December 31, 2016, Land		1,935
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		9,786
Gross Amount at Which Carried at December 31, 2016, Total		11,721
Accumulated Depreciation		$ 7,410
Year(s) Acquired		1,997
I-95 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Springfield, VA
Square Feet | ft²		210
Initial Cost to Company, Land		$ 3,535
Initial Cost to Company, Buildings and Improvements		15,672
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		12,142
Gross Amount at Which Carried at December 31, 2016, Land		3,535
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		27,814
Gross Amount at Which Carried at December 31, 2016, Total		31,349
Accumulated Depreciation		$ 20,528
Year(s) Acquired		2,000
Northpointe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Sterling, VA
Square Feet | ft²		147
Initial Cost to Company, Land		$ 2,767
Initial Cost to Company, Buildings and Improvements		8,778
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		4,587
Gross Amount at Which Carried at December 31, 2016, Land		2,767
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		13,365
Gross Amount at Which Carried at December 31, 2016, Total		16,132
Accumulated Depreciation		$ 9,976
Year(s) Acquired		1997/1998
Shaw Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Sterling, VA
Square Feet | ft²		149
Initial Cost to Company, Land		$ 2,969
Initial Cost to Company, Buildings and Improvements		10,008
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		4,476
Gross Amount at Which Carried at December 31, 2016, Land		2,969
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		14,484
Gross Amount at Which Carried at December 31, 2016, Total		17,453
Accumulated Depreciation		$ 10,828
Year(s) Acquired		1,998
Tysons Corporate Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Vienna, VA
Square Feet | ft²		270
Initial Cost to Company, Land		$ 9,885
Initial Cost to Company, Buildings and Improvements		25,302
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		9,333
Gross Amount at Which Carried at December 31, 2016, Land		9,885
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		34,635
Gross Amount at Which Carried at December 31, 2016, Total		44,520
Accumulated Depreciation		$ 13,426
Year(s) Acquired		2,010
Woodbridge [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Woodbridge, VA
Square Feet | ft²		114
Initial Cost to Company, Land		$ 1,350
Initial Cost to Company, Buildings and Improvements		3,398
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		1,908
Gross Amount at Which Carried at December 31, 2016, Land		1,350
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		5,306
Gross Amount at Which Carried at December 31, 2016, Total		6,656
Accumulated Depreciation		$ 3,935
Year(s) Acquired		1,997
212th Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Kent, WA
Square Feet | ft²		951
Initial Cost to Company, Land		$ 19,573
Initial Cost to Company, Buildings and Improvements		17,695
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		12,134
Gross Amount at Which Carried at December 31, 2016, Land		19,573
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		29,829
Gross Amount at Which Carried at December 31, 2016, Total		49,402
Accumulated Depreciation		$ 8,335
Year(s) Acquired		2,012
Overlake Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Redmond, WA
Square Feet | ft²		411
Initial Cost to Company, Land		$ 23,122
Initial Cost to Company, Buildings and Improvements		41,106
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		6,692
Gross Amount at Which Carried at December 31, 2016, Land		23,122
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		47,798
Gross Amount at Which Carried at December 31, 2016, Total		70,920
Accumulated Depreciation		$ 27,685
Year(s) Acquired		2,007
Renton [Member]
Real Estate and Accumulated Depreciation [Line Items]
Location		Renton, WA
Square Feet | ft²		28
Initial Cost to Company, Land		$ 330
Initial Cost to Company, Buildings and Improvements		889
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements		597
Gross Amount at Which Carried at December 31, 2016, Land		330
Gross Amount at Which Carried at December 31, 2016, Buildings and Improvements		1,486
Gross Amount at Which Carried at December 31, 2016, Total		1,816
Accumulated Depreciation		$ 1,065
Year(s) Acquired		1,997
Minimum [Member] | Buena Park Industrial Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Carson [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Cerritos Business Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Cerritos/Edwards [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Concord Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Culver City [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Bayview Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Christy Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Industrial Drive Distribution Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Bay Center Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Cabot Distribution Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Diablo Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Eden Landing [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Hayward Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Huntwood Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Parkway Commerce [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Corporate Pointe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Laguna Hills Commerce Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Plaza Del Lago [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Canada Business Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Dixon Landing Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Monterey/Calle [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Monterey Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Port Of Oakland [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Orangewood [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Orange County Business Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Kearney Mesa [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Lusk [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Rose Canyon Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Charcot Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Las Plumas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Little Orchard Distribution Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Montague Industrial Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Oakland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Rogers Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Doolittle Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Bayshore Corporate Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | San Ramon/Norris Canyon [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Commerce Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Santa Clara Tech Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Walsh At Lafayette [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Signal Hill [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Airport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | South San Francisco/Produce [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Studio City/Ventura [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Kifer Industrial Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Torrance [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Boca Commerce [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | MICC [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Wellington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Ammendale [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Gaithersburgh/Christopher [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Metro Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Parklawn Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Shady Grove [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Westech Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Ben White [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Lamar Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | McKalla [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | McNeil [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Rutland [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Waterford [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Braker Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Mopac Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Southpark Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Valwood Business Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Empire Commerce [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Northgate [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Northway Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Springlake Business Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Westwood Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Eastgate [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Freeport Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | NFTZ [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	[1]	5 years
Minimum [Member] | Royal Tech [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | La Prada [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | The Summit [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Arapaho Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Richardson Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Bren Mar [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Eisenhower [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Beaumont [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Dulles South/Sullyfield [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Lafayette [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Park East [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Fair Oaks Business Campus [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Monroe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Gunston [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | The Mile [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Prosperity Business Campus [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Alban Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | I-95 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Northpointe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Shaw Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Tysons Corporate Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Woodbridge [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | 212th Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Overlake Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Minimum [Member] | Renton [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		5 years
Maximum [Member] | Buena Park Industrial Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Carson [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Cerritos Business Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Cerritos/Edwards [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Concord Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Culver City [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Bayview Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Christy Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Industrial Drive Distribution Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Bay Center Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Cabot Distribution Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Diablo Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Eden Landing [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Hayward Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Huntwood Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Parkway Commerce [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Corporate Pointe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Laguna Hills Commerce Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Plaza Del Lago [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Canada Business Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Dixon Landing Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Monterey/Calle [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Monterey Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Port Of Oakland [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Orangewood [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Orange County Business Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Kearney Mesa [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Lusk [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Rose Canyon Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Charcot Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Las Plumas [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Little Orchard Distribution Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Montague Industrial Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Oakland Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Rogers Ave [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Doolittle Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Bayshore Corporate Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | San Ramon/Norris Canyon [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Commerce Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Santa Clara Tech Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Walsh At Lafayette [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Signal Hill [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Airport Boulevard [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | South San Francisco/Produce [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Studio City/Ventura [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Kifer Industrial Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Torrance [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Boca Commerce [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | MICC [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Wellington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Ammendale [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Gaithersburgh/Christopher [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Metro Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Parklawn Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Shady Grove [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Westech Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Ben White [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Lamar Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | McKalla [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | McNeil [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Rutland [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Waterford [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Braker Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Mopac Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Southpark Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Valwood Business Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Empire Commerce [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Northgate [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Northway Plaza [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Springlake Business Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Westwood Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Eastgate [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Freeport Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | NFTZ [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	[1]	30 years
Maximum [Member] | Royal Tech [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | La Prada [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | The Summit [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Arapaho Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Richardson Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Bren Mar [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Eisenhower [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Beaumont [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Dulles South/Sullyfield [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Lafayette [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Park East [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Fair Oaks Business Campus [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Monroe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Gunston [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | The Mile [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Prosperity Business Campus [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Alban Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | I-95 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Northpointe [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Shaw Road [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Tysons Corporate Center [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Woodbridge [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | 212th Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Overlake Business Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
Maximum [Member] | Renton [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)		30 years
[1]	The Company owns two properties that are subject to ground leases in Las Colinas, Texas, expiring in 2019 and 2020, each with one 10-year extension option.