PS Business Parks (PSBXP) 10-K 26 Feb 19 2018 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 18, 2019	Jun. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
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
Trading Symbol	psb
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		27,362,101
Entity Public Float			$ 2,553,972,195

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 37,379	$ 114,882
Real estate facilities, at cost:
Land	816,656	769,036
Buildings and improvements	2,374,943	2,156,862
Gross real estate investment property	3,191,599	2,925,898
Accumulated depreciation	(1,241,116)	(1,161,798)
Net real estate investment property	1,950,483	1,764,100
Properties held for sale, net		49,259
Land and building held for development	30,848	29,665
Total real estate investments	1,981,331	1,843,024
Investment in and advances to unconsolidated joint venture		100,898
Rent receivable, net	1,403	1,876
Deferred rent receivable, net	33,308	32,062
Other assets	15,173	7,417
Total assets	2,068,594	2,100,159
LIABILITIES AND EQUITY
Accrued and other liabilities	85,141	80,223
Preferred stock called for redemption		130,000
Total liabilities	85,141	210,223
Commitments and contingencies
PS Business Parks, Inc.'s shareholders' equity:
Preferred stock, $0.01 par value, 50,000,000 shares authorized, 38,390 shares issued and outstanding at December 31, 2018 and 2017	959,750	959,750
Common stock, $0.01 par value, 100,000,000 shares authorized, 27,362,101 and 27,254,607 shares issued and outstanding at December 31, 2018 and 2017, respectively	274	272
Paid-in capital	736,131	735,067
Accumulated earnings (deficit)	69,207	(1,778)
Total PS Business Parks, Inc.'s shareholders' equity	1,765,362	1,693,311
Noncontrolling interests	218,091	196,625
Total equity	1,983,453	1,889,936
Total liabilities and equity	$ 2,068,594	$ 2,100,159

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
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	38,390	38,390
Preferred stock, shares outstanding	38,390	38,390
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	27,362,101	27,254,607
Common stock, shares outstanding	27,362,101	27,254,607

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements Of Income [Abstract]
Rental income	$ 413,516	$ 402,179	$ 386,871
Expenses:
Cost of operations	126,547	125,340	123,108
Depreciation and amortization	99,242	94,270	99,486
General and administrative	10,155	9,679	14,862
Total operating expenses	235,944	229,289	237,456
Interest and other income	1,510	942	1,233
Interest and other expense	(665)	(1,285)	(5,664)
Equity in loss of unconsolidated joint venture		(805)
Gain on sale of real estate facilities	93,484	1,209
Gain on sale of development rights		6,365
Net income	271,901	179,316	144,984
Allocation to noncontrolling interests	(45,199)	(24,279)	(16,955)
Net income allocable to PS Business Parks, Inc.	226,702	155,037	128,029
Allocation to preferred shareholders based upon Distributions	(51,880)	(52,873)	(57,276)
Allocation to preferred shareholders based upon Redemption (Note 10)		(10,978)	(7,312)
Allocation to restricted stock unit holders	(1,923)	(761)	(569)
Net income allocable to common shareholders	$ 172,899	$ 90,425	$ 62,872
Net income per common share:
Basic	$ 6.33	$ 3.32	$ 2.32
Diluted	$ 6.31	$ 3.30	$ 2.31
Weighted average common shares outstanding:
Basic	27,321	27,207	27,089
Diluted	27,422	27,412	27,179

Consolidated Statements Of Equi

Consolidated Statements Of Equity - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Paid-In Capital [Member]	Accumulated Earnings (Deficit) [Member]	Total PS Business Parks, Inc.'s Shareholders' Equity [Member]	Noncontrolling Interests [Member]	Total
Balances at Dec. 31, 2015	$ 920,000	$ 269	$ 722,009	$ 18,218	$ 1,660,496	$ 200,103	$ 1,860,599
Cumulative effect of a change in accounting principle (Note 11)			807	(807)
Balances, shares at Dec. 31, 2015	36,800	27,034,073
Issuance of preferred stock, net of issuance costs	$ 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	$ (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
Cash paid for taxes in lieu of shares upon vesting of restricted stock units							(1,940)
Net income							144,984
Net income allocable to PS Business Parks, Inc				128,029	128,029		128,029
Net income Allocation 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 the OP			(2,313)		(2,313)	2,313
Balances at Dec. 31, 2016	$ 879,750	$ 271	733,671	(433)	1,613,259	197,455	1,810,714
Balances, shares at Dec. 31, 2016	35,190	27,138,138
Issuance of preferred stock, net of issuance costs	$ 430,000		(14,221)		415,779		415,779
Issuance of preferred stock, net of issuance costs, shares	17,200
Redemption of preferred stock, net of issuance costs	$ (350,000)		10,978	(10,978)	(350,000)		(350,000)
Redemption of preferred stock, net of issuance costs, shares	(14,000)
Issuance of common stock in connection with stock-based compensation		$ 1	4,217		4,218		4,218
Issuance of common stock in connection with stock-based compensation, shares		116,469
Stock compensation, net			4,016		4,016		4,016
Cash paid for taxes in lieu of shares upon vesting of restricted stock units			(3,865)		(3,865)		(3,865)
Net income							179,316
Net income allocable to PS Business Parks, Inc				155,037	155,037		155,037
Net income Allocation to noncontrolling interests						24,279	24,279
Distributions
Preferred stock				(52,873)	(52,873)		(52,873)
Common stock				(92,531)	(92,531)		(92,531)
Noncontrolling interests						(24,838)	(24,838)
Adjustment to noncontrolling interests in the OP			271		271	(271)
Balances at Dec. 31, 2017	$ 959,750	$ 272	735,067	(1,778)	1,693,311	196,625	1,889,936
Balances, shares at Dec. 31, 2017	38,390	27,254,607
Issuance of common stock in connection with stock-based compensation		$ 2	3,008		3,010		3,010
Issuance of common stock in connection with stock-based compensation, shares		107,494
Stock compensation, net			3,032		3,032		3,032
Cash paid for taxes in lieu of shares upon vesting of restricted stock units			(4,981)		(4,981)		(4,981)
Consolidation of joint venture (see Note 3)						4,032	4,032
Net income							271,901
Net income allocable to PS Business Parks, Inc				226,702	226,702		226,702
Net income Allocation to noncontrolling interests						45,199	45,199
Distributions
Preferred stock				(51,880)	(51,880)		(51,880)
Common stock				(103,837)	(103,837)		(103,837)
Noncontrolling interests						(27,760)	(27,760)
Adjustment to noncontrolling interests in the OP			5		5	(5)
Balances at Dec. 31, 2018	$ 959,750	$ 274	$ 736,131	$ 69,207	$ 1,765,362	$ 218,091	$ 1,983,453
Balances, shares at Dec. 31, 2018	38,390	27,362,101

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income	$ 271,901	$ 179,316	$ 144,984
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization expense	99,242	94,270	99,486
Tenant improvement reimbursements, net of lease incentives	(2,226)	(2,183)	(1,666)
Equity in loss of unconsolidated joint venture		805
Gain on sale of real estate facilities and development rights	(93,484)	(7,574)
Stock compensation	4,174	4,777	10,913
Amortization of financing costs	537	475	523
Other, net	(3,991)	1,728	(3,733)
Total adjustments	4,252	92,298	105,523
Net cash provided by operating activities	276,153	271,614	250,507
Cash flows from investing activities:
Capital expenditures to real estate facilities	(38,663)	(50,219)	(31,877)
Capital expenditures to land and building held for development	(1,183)	(1,549)	(49)
Investment in and advances to unconsolidated joint venture		(34,513)	(40,454)
Acquisition of real estate facilities	(142,399)		(12,628)
Proceeds from sale of real estate facilities	145,097	2,144
Proceeds from sale of development rights		4,900
Consolidation of joint venture	1,082
Net cash used in investing activities	(36,066)	(79,237)	(85,008)
Cash flows from financing activities:
Borrowings on credit facility	50,000	250,000	116,000
Repayment of borrowings on credit facility	(50,000)	(250,000)	(116,000)
Repayment of mortgage note payable			(250,000)
Payment of financing costs	(307)	(858)
Proceeds from the exercise of stock options	3,010	4,218	3,888
Cash paid for taxes in lieu of shares upon vesting of restricted stock units	(4,981)	(3,865)	(1,940)
Redemption of preferred stock	(130,000)	(450,000)
Net proceeds from the issuance of preferred stock		415,779	183,316
Cash paid to restricted stock unit holders	(1,142)	(761)	(569)
Distributions paid to preferred shareholders	(52,573)	(52,180)	(57,276)
Distributions paid to common shareholders	(103,837)	(92,531)	(81,285)
Distributions paid to noncontrolling interest - common units	(27,760)	(24,838)	(21,916)
Net cash used in financing activities	(317,590)	(205,036)	(225,782)
Net decrease in cash and cash equivalents	(77,503)	(12,659)	(60,283)
Cash, cash equivalents and restricted cash at the beginning of the period	115,970	128,629	188,912
Cash, cash equivalents and restricted cash at the end of the period	38,467	115,970	128,629
Supplemental disclosures:
Interest paid	40	1,188	7,395
Adjustment to noncontrolling interests- common units in the OP
Noncontrolling interests- common units	(5)	(271)	2,313
Paid-in capital	5	271	(2,313)
Consolidation of joint venture
Land	21,814
Buildings and improvements	84,903
Other, net	(1,787)
Investment in and advances to unconsolidated joint venture	(100,898)
Noncontrolling interest - joint venture	$ (4,032)
Preferred Redemption Allocation
Paid-in capital		10,978	7,312
Accumulated earnings (deficit)		(10,978)	(7,312)
Preferred stock called for redemption
Preferred stock called for redemption and reclassified to liabilities		130,000	230,000
Preferred stock called for redemption and reclassified from equity		(130,000)	(230,000)
Accrued Preferred Stock Distributions
Accrued and other liabilities		693
Accumulated earnings (deficit)		$ (693)
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
Accumulated earnings (deficit)			$ (807)

Organization And Description Of

Organization And Description Of Business	12 Months Ended
	Dec. 31, 2018
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, 2018 , PSB owned 78.9 % of the common partnership units of PS Business Parks, L.P. (the “OP”). The remaining common partnership units are owned by Public Storage (“PS”). PS’s interest in the OP is referred to as the “PS OP Interests.” PSB, as the sole general partner of the OP, has full, exclusive and complete responsibility and discretion in managing and controlling the OP. PSB and its subsidiaries, including the OP and our consolidated joint venture, are collectively referred to as the “Company,” “we,” “us,” or “our.” PS would own 41.7 % (or 14.5 million shares) of the outstanding shares of the Company’s common stock if it redeemed its common partnership units for common shares.  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 industrial, flex and office space. As of December 31, 2018 , the Company owned and operated 28.2 million rentable square feet of commercial space in six states and held a 95.0% interest in a 395 -unit multifamily apartment complex. The Company also manages for a fee 450,000 rentable square feet on behalf of PS.  References to the number of properties, apartment units or square footage are unaudited and outside the scope of the Company’s independent registered public accounting firm's audit of the Company’s consolidated 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, 2018
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 its subsidiaries, including the OP and our consolidated joint venture. 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  We consider entities to be Variable Interest Entities (“VIEs”) when they have insufficient equity to finance their activities without additional subordinated financial support provided by other parties, or the equity holders as a group do not have a controlling financial interest. A limited partnership is also generally considered a VIE if the limited partners do not participate in operating decisions. We consolidate VIEs when we are the primary beneficiary, generally defined as having (i) the power to direct the activities most significantly impacting economic performance and (ii) either the obligation to absorb losses or the right to receive benefits from the VIE.  We account for investments in entities that are not VIEs that we have significant influence over, but do not control, using the equity method of accounting and for investment in entities that we control, we consolidate. Prior to January 1, 2018, we had an interest in a joint venture engaged in the development and operation of residential real estate, which we accounted for using the equity method of accounting. On January 1, 2018, we began to consolidate the joint venture in our consolidated financial statements, due to changes to the joint venture agreement that gave the Company control of the joint venture. See Note 4 for more information on this entity.  PS, the sole limited partner in the OP, has no power to direct the activities of the OP. We are the primary beneficiary of the OP. Accordingly, we consider the OP a VIE and consolidate it. Substantially all of our assets and liabilities are held by the OP. Noncontrolling interests  Noncontrolling interests represent (i) PS’s noncontrolling interest in the OP through its ownership of 7,305,355 common partnership units and (ii) a third-party 5.0% interest in our consolidated joint venture owning a 395 -unit multifamily apartment complex. See Note 8 for further information on noncontrolling interests.  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. Customer receivables are net of an allowance for estimated uncollectible accounts totaling $ 400,000 at both December 31, 2018 and 2017 . Deferred rent receivable is net of an allowance for uncollectible accounts totaling $876,000 and $867,000 at December 31, 2018 and 2017 , 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 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 various 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.  The following table provides a reconciliation of cash, cash equivalents and restricted cash per the consolidated statements of cash flow to the corresponding financial statement line items in the consolidated balance sheets as of December 31, 2018 , 2017 and 2016 (in thousands) :     For The Years Ended December 31,  2018 2017 2016  Consolidated balance sheets  Cash and cash equivalents $ 37,379 $ 114,882 $ 128,629  Restricted cash included in  Land and building held for development 1,088 1,088 —  Consolidated statements of cash flows $ 38,467 $ 115,970 $ 128,629  During 2017, in conjunction with seeking entitlements to develop our multifamily projects in Tysons, Virginia, we contributed $1.1 million into an escrow account for the future development of an athletic field.  Carrying values of the Company’s unsecured Credit Facility (as defined below) 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. Property taxes, insurance, interest and costs essential to the development of property for its intended use are capitalized during the period of development. Direct 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 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, for leases with terms greater than one year are capitalized and depreciated over their estimated useful lives.  Property held for sale or development  Real estate is classified as held for sale when the asset is being marketed for sale and we expect that a sale is likely to occur in the next 12 months. Real estate is classified as held for development when it is no longer used in its original form and likely that it will be developed to an alternate use. Property held for development or sale is not depreciated.  Intangible assets/liabilities  When we acquire real estate facilities, an intangible asset is recorded as other assets for leases where the in-place rent is higher than market rents, and an intangible liability is recorded as other liabilities where the market rents are higher than the in-place rents. The amounts recorded are based upon the present value (using a discount rate which reflects the risks associated with the leases acquired) of such differences over the lease term and such amounts are amortized to rental income over the respective remaining lease term. As of December 31, 2018 , the value of above-market in-place rents resulted in net intangible assets of $1.8 million, net of $10.0 million of accumulated amortization and the value of below-market in-place rents resulted in net intangible liabilities of $1.8 million, net of $10.8 million of accumulated amortization. As of December 31, 2017 , the value of above-market in-place rents resulted in net intangible assets of $731,000 , net of $9.5 million of accumulated amortization and the value of below-market in-place rents resulted in net intangible liabilities of $383,000 , net of $10. 4 million of accumulated amortization.  Additionally, when we acquire real estate facilities, the value of in-place leases (i.e. customer lease-up costs) is recorded as other assets and is amortized to depreciation and amortization expense over the respective remaining lease term. As of December 31, 2018 , the value of acquired in-place leases resulted in net intangible assets of $4.7 million, net of $1.3 million of accumulated amortization. As of December 31, 2017 , we had no in-place lease intangibles on our consolidated balance sheet. Evaluation of asset impairment  We evaluate our real estate and finite-lived intangible assets for impairment each quarter. If there are indicators of impairment and we determine that the carrying value of the asset is not recoverable from estimated future undiscounted cash flows to be received through the asset’s remaining life (or, if earlier, the expected disposal date), we record an impairment charge to the extent the carrying amount exceeds the asset’s estimated fair value or net proceeds from expected disposal.  We evaluate our investment in our unconsolidated joint venture on a quarterly basis. We record an impairment charge to the extent the carrying amount exceeds estimated fair value, when we believe any such shortfall is other than temporary.  No impairment charges were recorded in any period presented herein.  Asset impairment due to casualty loss  It is our policy to record losses due to physical damages during the accounting period in which they occur, while the amount of monetary assets to be received from the insurance policy is recognized when receipt of insurance recoveries is probable. Losses, which are reduced by the related probable insurance recoveries, are recorded as costs of operations on the consolidated statements of income. Anticipated proceeds in excess of recognized losses would be considered a gain contingency and recognized when the contingency related to the insurance claim has been resolved. Anticipated recoveries for lost rental income due to property damages are also considered to be a gain contingency and recognized when the contingency related to the insurance claim has been resolved.  No material casualty losses were incurred in any period presented herein.  Stock compensation  Share-based payments to employees, including grants of employe e stock options, are recognized as stock compensation in the Company’s consolidated statements of income based on their grant date fair values, except for performance-based grants, which are accounted for based on their fair values at the beginning of the service period. See Note 11.  Accrued and other liabilities and other assets  Accrued and other liabilities consist primarily of rents prepaid by our customers, trade payables, property tax accruals, accrued payroll and contingent loss accruals when probable and estimable, as well as the intangible liabilities discussed above. We disclose the nature of significant unaccrued losses that are reasonably possible of occurring and, if estimable, a range of exposure.  Other assets are comprised primarily of prepaid expenses as well as the intangible assets discussed above.  We believe the fair value of our accrued and other liabilities and other assets approximate book value, due to the short period until settlement.  Revenue recognition  We recognize the aggregate rent to be collected (including the impact of escalators and concessions) under leases ratably throughout the non-cancellable lease term on a “Straight-Line” basis, commencing when the customer takes control of the leased space. Cumulative Straight-Line rent recognized in excess of amounts billed per the lease terms is presented as “deferred rent receivable” on our consolidated balance sheets. Reimbursements from customers 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 as other income.  Costs incurred in acquiring customers (primarily tenant improvements and lease commissions) are capitalized and amortized over the lease period for leases with terms greater than one year .  Sales of real estate facilities  Sales of real estate facilities are not part of our ordinary activities, and as a result, we consider such sales as contracts with non-customers. We recognize sales of real estate when we have collected payment and the attributes of ownership such as possession and control of the asset have been transferred to the buyer. If a contract for sale includes obligations to provide goods or services to the buyer, an allocated portion of the contract price is recognized as revenue as the related goods or services are transferred to the buyer.  General and administrative expenses  General and administrative expenses include executive and other compensation, corporate office expenses, professional fees, state income taxes and other such costs that are not directly related to the operation of our real estate facilities.  Income taxes  We have elected to be treated as a REIT, as defined in the Internal Revenue Code of 1986, as amended (the “Code”). As a REIT, we do not incur federal income tax if we distribute substantially all of our “REIT taxable income” each year, and if we meet certain organizational and operational rules. We believe we have met these REIT requirements for all periods presented herein. Accordingly, we have recorded no federal income tax expense related to our “REIT taxable income.”  We recognize tax benefits of uncertain income tax positions that are subject to audit only if we believe it is more likely than not that the position would ultimately be sustained assuming the relevant taxing authorities had full knowledge of the relevant facts and circumstances of our positions. As of December 31, 2018 and 2017 , we did not recognize any tax benefit for uncertain tax positions.  Accounting for preferred equity issuance costs  We record issuance costs as a reduction to paid-in capital on our consolidated balance sheets at the time the preferred securities are issued and reflect the carrying value of the preferred equity at its redemption value. An additional allocation of income is made from the common shareholders to the preferred shareholders in the amount of the original issuance costs, and we reclassify the redemption value from equity to liabilities when we call preferred shares for redemption.  Net income per common share  Notwithstanding the presentation of income allocations on our consolidated statements of income, net income is allocated to (a) preferred shareholders, for distributions paid or payable, (b) preferred shareholders, to the extent redemption value exceeds the related carrying value (a “Preferred Redemption Allocation”) and (c) restricted stock unit (“RSU”) holders, for non-forfeitable dividends paid adjusted for participation rights in undistributed earnings. The remaining net income is allocated to the common partnership units and our common shareholders, respectively, based upon the pro-rata aggregate number of units and shares outstanding.  Basic and diluted net income per common share are each calculated based upon net income allocable to common shareholders, divided by (i) in the case of basic net income per common share, weighted average common shares and (ii) in the case of diluted income per share, weighted average common shares adjusted for the impact of stock compensation awards outstanding (Note 11) using the treasury stock method.  The following tables set forth the calculation of the components of our basic and diluted income per share that are not reflected on the face of our consolidated statements of income, including the allocation of income to common shareholders and common partnership units, the percentage of weighted average shares and common partnership units, as well as basic and diluted weighted average shares for the years ended December 31, ( in thousands ):      2018 2017 2016  Calculation of net income allocable to common shareholders  Net income $ 271,901 $ 179,316 $ 144,984  Net (income) loss allocated to  Preferred shareholders based upon distributions (51,880) (52,873) (57,276)  Preferred shareholders based upon redemptions — (10,978) (7,312)  Noncontrolling interests—joint venture 1,030 — —  Restricted stock unit holders (1,923) (761) (569)  Net income allocable to common shareholders  and noncontrolling interests—common units 219,128 114,704 79,827  Net income allocation to noncontrolling interests—  common units (46,229) (24,279) (16,955)  Net income allocable to common shareholders $ 172,899 $ 90,425 $ 62,872   Calculation of common partnership units as a percentage of common share equivalents  Weighted average common shares outstanding 27,321 27,207 27,089  Weighted average common partnership units outstanding 7,305 7,305 7,305  Total common share equivalents 34,626 34,512 34,394  Common partnership units as a percentage of common  share equivalents 21.1% 21.2% 21.2%   Weighted average common shares outstanding  Basic weighted average common shares outstanding 27,321 27,207 27,089  Net effect of dilutive stock compensation — based on  treasury stock method using average market price 101 205 90  Diluted weighted average common shares outstanding 27,422 27,412 27,179  Segment reporting  The Company views its operations as one segment . We have two operating segments: (i) the acquisition, development, ownership and management of commercial real estate and (ii) the acquisition, development, ownership and management of multifamily real estate, but have one reportable segment as the multifamily segment does not meet the quantitative thresholds necessary to require reporting as a separate segment.  Reclassifications  Certain reclassifications have been made to the consolidated financial statements for 2016 in order to conform to the 2018 presentation, including reclassifying management fee income totaling $518,000 for the year ended December 31, 2016 into “interest and other income” on our consolidated statements of income.   Recently issued accounting standards  In May 2014 and February 2016, the Financial Accounting Standards Board (“FASB”) issued two Accounting Standards Updates (“ASU”s), ASU 2014-09, Revenue from Contracts with Customers (the “Revenue Standard”), and ASU 2016-02, Leases (the “Lease Standard”). These standards apply to substantially all of our revenue generating activities, as well as provide a model to account for the disposition of real estate facilities to non-customers, which is governed under ASU 2017-05, Other Income - Gains and losses from the Derecognition of Nonfinancial Assets , clarifying the scope of asset derecognition guidance and accounting for partial sales of nonfinancial assets.  The Lease Standard will direct how we account for payments from the elements of our leases that are generally fixed and determinable at the inception of the lease (“Fixed Lease Payments”) while the Revenue Standard will direct how we account for the non-lease components of our lease contracts, primarily expense reimbursements (“Non-Lease Payments”). The adoption of the Revenue Standard and its impact on our accounting for the disposition of real estate facilities is described below.  The Lease Standard requires us to identify Fixed Lease Payments and Non-Lease Payments of a lease agreement and will govern the recognition of revenue for the Fixed Lease Payments. Revenue related to Non-Lease Payments under our lease arrangements will be subject to the Revenue Standard effective upon adoption of the Lease Standard. See further discussion below on Fixed Lease Payments and Non-Lease Payments.  Under the Lease Standard, a set of practical expedients for implementation, which must be elected as a package and for all leases, may be elected. These practical expedients include (i) relief from re-assessing whether an expired or existing contract meets the definition of a lease, (ii) relief from re-assessing the classification of expired or existing leases at the adoption date and (iii) allowing previously capitalized initial direct leasing costs to continue to be amortized. We elected the practical expedient package upon adoption of the Lease Standard on January 1, 2019.  We implemented the Lease Standard on its effective date of January 1, 2019 using the required modified retrospective transition approach (with certain transition relief that is available to us). The modified retrospective approach will require us to first record an adjustment to the January 1, 2017 balance of accumulated earnings (deficit) for the cumulative impact of the Lease Standard on all leases existing at January 1, 2017. Then, we will have to restate the financial statements for the years ended December 31, 2017 and 2018 for the Lease Standard impact on all leases that were in force at any time during those periods. In July, 2018, the FASB issued an amendment to the transition method that allows adoption on January 1, 2019 with a cumulative effect adjustment as of January 1, 2019, with no restatement of prior periods. We elected this transition method upon adoption of the Lease Standard on January 1, 2019.  Lessor Accounting  We recognized revenue from our lease arrangements aggregating $413.5 million for the year ended December 31, 2018 . This revenue consisted primarily of rental income and expense reimbursements of $322.3 million and $91.2 million , respectively.  Under the accounting standards in effect prior to January 1, 2019, we are required to account for Fixed Lease Payments on a straight-line basis, with the expected fixed payments recognized ratably over the term of the lease. Payments for expense reimbursements received under these lease arrangements related to our customer’s pro rata share of real estate taxes, insurance, utilities, repairs and maintenance, common area expense and other operating expenses are considered Fixed Lease Payments. We recognize these reimbursements as revenue when the related contractually recoverable operating expenses are incurred.  Under the Lease Standard, the total consideration in each lease agreement will be allocated to the Fixed Lease Payment and Non-Lease Payments based on their relative standalone selling prices. Lessors will continue to recognize the Fixed Lease Payments on a straight-line basis, which is consistent with existing guidance for operating leases. The issued amendment to the Lease Standard noted above also allows lessors to elect, as a practical expedient, not to allocate the total consideration to Fixed Lease Payments and Non-Lease Payments based on their relative standalone selling prices. This practical expedient allows lessors to elect a combined single component presentation if (i) the timing and pattern of the revenue recognition for the Fixed Lease Payments and Non-Lease Payments are the same, and (ii) the combined single component of the lease would continue to be classified as an operating lease.  We do not expect that the Lease Standard will impact our accounting for Fixed Lease Payments, because our accounting policy is currently consistent with the provisions of the standard. Upon adoption of the Lease Standard, we expect to adopt the practical expedient, specifically related to payments for expense reimbursements that qualify as Non-Lease Payments to be presented under a single lease component presentation, which would otherwise be accounted for under the Revenue Standard. We believe the two conditions have been met for Non-Lease Payments as (i) the timing and pattern of transfer of the Fixed Lease Payments and Non-Lease Payments are the same, and (ii) the combined single component of the lease would be classified as an operating lease. Costs to execute leases  The Lease Standard also provides updated guidance on the requirements for the capitalization of the incremental costs incurred in executing leases, such as legal fees and commissions. Under the Lease Standard, any costs that would have been incurred regardless of successful lease execution, such as allocated costs of internal personnel, are to be expensed and may not be capitalized. As we do not currently capitalize any such costs, we do not expect this component of the Lease Standard to have a material effect to our consolidated financial statements.  Lessee accounting  Under the Lease Standard, lessees are required to apply a dual approach by classifying leases as either finance or operating leases based on the principle whether the lease is effectively a finance purchase of the leased asset by the lessee. This classification will determine whether the lease expense is recognized based on an effective interest method or a straight-line basis over the term of the lease. F or most leases with a term of greater than 12 months, in which we are the lessee, the present value of future lease payments will be recognized on our balance sheet as a right-of-use asset and related liability. We do not expect a material impact to our consolidated financial statements from the initial recognition of each lease liability upon the adoption, nor from the pattern of recognition subsequent to adoption.  The Revenue Standard  In May, 2014, the FASB issued the Revenue Standard on recognition of revenue arising from contracts with customers, as well as the accounting for the disposition of real estate facilities, and subsequently, issued additional guidance that further clarified the standard. Rental income from leasing arrangements is a substantial portion of our revenues and is specifically excluded from the Revenue Standard and will be governed by the Lease Standard (discussed above).  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 Revenue Standard permits either the full retrospective or modified retrospective transition method. We adopted the Revenue Standard effective January 1, 2018 utilizing the modified retrospective transition method applied to contracts not completed as of January 1, 2018 and the adoption did not result in a material impact to our consolidated financial statements.  Revenue within the scope of the Revenue Standard  Sales of Real Estate Facilities  Under the Revenue Standard, which includes guidance on recognition of gains and losses arising from the derecognition of nonfinancial assets in a transaction with non-customers, the derecognition model is based on the transfer of control of nonfinancial assets or in substance nonfinancial assets that do not meet the definition of a business. Generally, our sales of real estate facilities would be considered a sale of a nonfinancial asset to non-customers. If we determine we do not have a controlling financial interest in the entity that holds the asset and the arrangement meets the criteria to be accounted for as a contract, we would derecognize the asset and recognize a gain or loss on the sale of the real estate facilities accounted under the revenue recognition principles under the Revenue Standard.  The adoption of the Revenue Standard had no material impact on the recognition of $93.5 million in gain on sale of real estate facilities during the year ended December 31, 2018.

Real Estate Facilities

Real Estate Facilities	12 Months Ended
	Dec. 31, 2018
Real Estate Facilities [Abstract]
Real Estate Facilities	3. Real estate facilities  The activity in real estate facilities for the years ended December 31, 2018 , 2017 and 2016 is as follows (in thousands) :     Buildings and Accumulated  Land Improvements Depreciation Total  Balances at December 31, 2015 $ 773,074 $ 2,109,097 $ (1,010,197) $ 1,871,974  Acquisition of real estate facilities 5,638 7,637 — 13,275  Capital expenditures — 37,232 — 37,232  Disposals (1) — (14,411) 14,411 —  Depreciation and amortization expense — — (99,486) (99,486)  Transfer to land and building held for development (9,676) (19,092) 7,870 (20,898)  Transfer to properties held for sale — (1,251) 3,316 2,065  Balances at December 31, 2016 769,036 2,119,212 (1,084,086) 1,804,162  Capital expenditures — 51,909 — 51,909  Disposals (1) — (13,919) 13,919 —  Depreciation and amortization expense — — (94,270) (94,270)  Transfer to properties held for sale — (340) 2,639 2,299  Balances at December 31, 2017 (2) 769,036 2,156,862 (1,161,798) 1,764,100  Acquisition of real estate facility 25,806 112,230 — 138,036  Consolidation of joint venture 21,814 84,903 — 106,717  Capital expenditures — 38,904 — 38,904  Disposals (1) — (17,345) 17,345 —  Depreciation and amortization expense — — (96,732) (96,732)  Transfer to properties held for sale — (611) 69 (542)  Balances at December 31, 2018 $ 816,656 $ 2,374,943 $ (1,241,116) $ 1,950,483  ____________________________ (1) Disposals primarily represent the book value of tenant improvements that have been removed upon the customer vacating their space. (2) We reclassified seven multi-tenant flex buildings totaling 194,000 square feet located in Dallas, Texas, as properties held for sale as of December 31, 2017.  The unaudited December 31, 2018 net federal tax basis of real estate facilities was approximately $1.9 billion .  As of December 31, 2018 , we have commitments, pursuant to executed leases throughout our portfolio, to spend $9.8 million on transaction costs, which include tenant improvements and lease commissions.  The purchase price of acquired properties is allocated to land, buildings and improvements (including tenant improvements, unamortized lease commissions, acquired in-place lease values and customer relationships, if any), intangible assets and intangible liabilities (see Note 2), based upon the relative fair value of each component, which are evaluated independently.  We must make significant assumptions in determining the fair value of assets acquired and liabilities assumed, which can affect the recognition and timing of revenue and depreciation and amortization expense. The fair value of land is estimated based upon, among other considerations, comparable sales of land within the same region. The fair value of buildings and improvements, tenant improvements and unamortized lease commissions are based on current market replacement costs and other available 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.  Effective January 1, 2017, transaction costs related to asset acquisitions are capitalized as part of the purchase price. Prior to 2017, such costs related to asset acquisitions were expensed as incurred.  On June 8, 2018 , we acquired two multi-tenant industrial parks aggregating 1.1 million rentable square feet in Springfield, Virginia, for a net purchase price of $143.8 million.  On September 28, 2016 , we acquired two multi-tenant office buildings aggregating 226,000 square feet in Rockville, Maryland, for a purchase price of $13.3 million. We incurred and expensed related acquisition transaction costs of $328,000 for the year ended December 31, 2016.  We did no t acquire any properties during the year ended December 31, 2017.  The following table summarizes the assets acquired and liabilities assumed for the years ended December 31, (in thousands) :    2018 2017 2016  Land $ 25,806 $ — $ 5,638  Buildings and improvements 112,230 — 7,637  Other assets (above-market in-place rents) 1,487 — —  Accrued and other liabilities (below-market in-place rents) (1,790) — (25)  Other assets (in-place lease value) 6,033 — —  Total purchase price 143,766 — 13,250  Net operating assets acquired and liabilities assumed (1,367) — (622)  Total cash paid $ 142,399 $ — $ 12,628  The following table summarizes the assets acquired and liabilities assumed related to the consolidation of the joint venture, which was accounted for as an asset acquisition, as of January 1, 2018 (see Note 4 below) (in thousands) :    Land $ 21,814  Buildings and improvements 84,903  Other assets (in-place lease value) 1,199  Total consolidated joint venture 107,916  Noncontrolling interest in consolidated joint venture (4,032)  Net book value of joint venture at consolidation $ 103,884  On March 31, 2017, we sold development rights we held to build medical office buildings on land adjacent to our Westech Business Park in Silver Spring, Maryland for $6.5 million. We received net sale proceeds of $6.4 million, of which $1.5 million was received in prior years and $4.9 million was received in 2017. We recorded a net gain of $6.4 million for the year ended December 31, 2017.  Properties Sold  In 2017 and 2018, we entered into a plan to sell four of our properties. We determined that the sale did not meet the criteria for discontinued operations presentation as the plan to sell did not represent a strategic shift that will have a major effect on our operations and financial results. As a result of this classification, the assets of the properties are separately presented as held for sale in the consolidated balance sheet as of December 31, 2017.  On March 5, 2018 , we sold Corporate Pointe Business Park, a park consisting of five multi-tenant office buildings totaling 161,000 square feet located in Orange County, California, for net sale proceeds of $41.7 million, which resulted in a gain of $26.8 million. On April 18, 2018 , we sold Orange County Business Center, a park consisting of five multi-tenant office buildings totaling 437,000 square feet located in Orange County, California, for net sale proceeds of $73.3 million, which resulted in a gain of $50.6 million. On April 30, 2018 , we sold Northgate Business Park, a park consisting of seven multi-tenant flex buildings totaling 194,000 square feet located in Dallas, Texas, for net sale proceeds of $11.8 million, which resulted in a gain of $7.9 million. On October 31, 2018 , we sold Orangewood Office Park, a park consisting of two multi-tenant office buildings totaling 107,000 square feet located in Orange County, California, for net sale proceeds of $18.3 million, which resulted in a gain of $8.2 million.  Each of the facilities sold during the year ended December 31, 2018 were included in “properties held for sale, net” as of December 31, 2017.  On May 1, 2017 , we sold Empire Commerce, a two -building single-story office park comprising 44,000 square feet, located in Dallas, Texas, for net sale proceeds of $2.1 million, which resulted in a net gain of $1.2 million. As of November 1, 2016, we transferred a 123,000 square foot vacant office building located within The Mile that we are seeking to demolish in order to construct a multifamily apartment complex on the parcel. This parcel is reflected on our consolidated balance sheets as land and building held for development. The scope and timing of development of this site is subject to a variety of contingencies, including approval of entitlement. Prior to being classified as land and building held for development, the building was occupied by a single customer.

Investment In And Advances To U

Investment In And Advances To Unconsolidated Joint Venture	12 Months Ended
	Dec. 31, 2018
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 with an unrelated real estate development company (the “JV Partner”) for the purpose of developing a 395 -unit multifamily building on a five -acre site (the “Project”) within the Company’s 628,000 square foot office park located in Tysons, Virginia (known as “The Mile”). We hold a 95.0% interest in the joint venture with the remaining 5.0% held by the JV Partner. The JV Partner was responsible for the development and construction of the Project, and has been and continues to be responsible for the leasing and operational management of the Project. Prior to January 1, 2018, we did not control the joint venture, when considering, among other factors, that the consent of the JV Partner was required for all significant decisions. Accordingly, we previously accounted for our investment using the equity method. On January 1, 2018, we began to consolidate the joint venture due to changes to the joint venture agreement that gave the Company control of the joint venture.  On October 5, 2015 , we contributed the site and improvements to the joint venture. We also provided the joint venture with a construction loan in the amount of $75.0 million bearing interest at the London Interbank Offered Rate (“LIBOR”) plus 2.25% . The loan will mature on April 5, 2019 with two one -year extension options. Based on the consolidation of the joint venture, the construction loan to the joint venture has been eliminated in our consolidated financial statements.  The aggregate amount of development costs were $107.0 million , which included our net book value of contributed land plus entitlement costs but excluded unrealized land appreciation. The Project delivered its first completed units in May, 2017, and was substantially completed during the fourth quarter of 2017.  At December 31, 2017, we reflected the aggregate cost of the contributed site and improvements, our equity contributions and loan advances, as well as capitalized third party interest we incurred as investment in and advances to unconsolidated joint venture. The Company’s investment in and advances to unconsolidated joint venture was $100.9 million at December 31, 2017. For the year ended December 31, 2017, we made loan advances of $34.1 million and capitalized $506,000 of interest. For the year ended December 31, 2016, we made loan advances of $33.9 million, capital contributions of $5.7 million and capitalized $885,000 of interest.  During the year ended December 31, 2017, the Company recorded an equity loss in the unconsolidated joint venture of $805,000 , comprised of net operating income of $375,000 and depreciation expense of $1.2 million.

Leasing Activity

Leasing Activity	12 Months Ended
	Dec. 31, 2018
Leasing Activity [Abstract]
Leasing Activity	 5. Leasing activity  The Company leases space in its commercial real estate facilities to customers primarily under non-cancelable leases generally ranging from one to 10 years. Future minimum rental income, excluding recovery of operating expenses under these leases, is as follows as of December 31, 2018 (in thousands) :     2019 $ 289,220  2020 223,015  2021 164,039  2022 111,253  2023 73,019  Thereafter 112,059  Total $ 972,605  In addition to minimum rental payments, certain customers reimburse the Company for their pro rata share of specified property operating expenses. Such reimbursements amounted to $ 91. 2 million, $ 90. 8 million and $ 82.6 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. These amounts are included as rental income in the accompanying consolidated statements of income.  Leases accounting for 3. 0 % of total leased square footage are subject to termination options, of which 1. 3 % of total leased square footage have termination options exercisable through December 31, 2019 (unaudited). In general, these leases provide for termination payments to us should the termination options be exercised. The future minimum rental income in the above table assumes such options are not exercised.

Bank Loans

Bank Loans	12 Months Ended
	Dec. 31, 2018
Bank Loans [Abstract]
Bank Loans	6. Bank loans  We have a revolving line of credit (the “Credit Facility”) with Wells Fargo Bank, National Association (“Wells Fargo”). The Credit Facility has a borrowing limit of $ 250.0 million and expires January 10 , 2022 . The rate of interest charged on borrowings is based on 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% . 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 %). We had no balance outstanding on our Credit Facility at December 31, 2018 and 2017 . We paid $613,000 of loan origination costs in January, 2017. The Company had $ 691,000 and $ 921,000 of total unamortized loan origination costs as of December 31, 2018 and 2017 , respectively, which is included in other assets in the accompanying consolidated balance sheets. The Credit Facility requires us to meet certain covenants, all of which we were in compliance with at December 31, 2018 . Interest on outstanding borrowings is payable monthly .

Mortgage Note Payable

Mortgage Note Payable	12 Months Ended
	Dec. 31, 2018
Mortgage Note Payable [Abstract]
Mortgage Note Payable	 7. Mortgage note payable  On June 1, 2016 , the Company repaid in full a $250.0 million mortgage note which had a fixed interest rate of 5.45% .

Noncontrolling Interests

Noncontrolling Interests	12 Months Ended
	Dec. 31, 2018
Noncontrolling Interests [Abstract]
Noncontrolling Interests	 8. Noncontrolling interests  Noncontrolling interests represent (i) PS’s noncontrolling interest in the OP through its ownership of 7,305,355 common partnership units, totaling $215.1 million and $196.6 million at December 31, 2018 and 2017 , respectively, and (ii) the JV Partner’s 5.0% interest in a joint venture owning a 395 -unit multifamily apartment complex, totaling $3.0 million and none at December 31, 2018 and 2017, respectively.  PS OP Interests  Each common partnership unit receives a cash distribution equal to the dividend paid on our common shares and is redeemable at PS’s option.  If PS exercises its right of redemption, at PSB’s option (a) PS will receive one common share from us for each common partnership unit redeemed, or (b) PS will receive cash from us for each common partnership unit generally equal to the market value of a common share (as defined in the Operating Partnership Agreement). We can prevent redemptions that we believe would violate either our articles of incorporation or securities laws, cause PSB to no longer qualify as a REIT, or could result in the OP no longer being treated as a partnership for federal tax purposes.  In allocating net income and presenting equity, we treat the common partnership units as if converted to common shares. Accordingly, they receive the same net income allocation per unit as a common share and are adjusted each period to have the same equity per unit as a common share, totaling $46.2 million, $24.3 million and $17.0 million for the years ended December 31, 2018 , 2017 and 2016 , respectively.  JV Partner  In conjunction with consolidating the joint venture on January 1, 2018, we recorded noncontrolling interest of $4.0 million related to the JV Partner’s 5.0% interest in a joint venture owning a 395 -unit multifamily apartment complex. A total of $1.0 million in loss was allocated to the JV Partner during year ended December 31, 2018 and no distributions were paid to the JV Partner. 

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	9. Related party transactions  We manage certain industrial, office and retail facilities in the United States for PS under either the “Public Storage” or “PS Business Parks” names (the “PS Management Agreement”). Under PS’s supervision, we coordinate and assist in rental and marketing activities, property maintenance and other operational activities, including the selection of vendors, suppliers, employees and independent contractors. We receive a management fee based upon a percentage of revenues, which is included in “interest and other income” on our consolidated statements of income. Management fee revenues were $ 407,000 , $506,000 and $518,000 for the years ended December 31, 2018 , 2017 and 2016 , respectively. We allocate certain operating expenses to PS related to the management of these properties, including payroll and other business expenses, totaling $472,000 , $537,000 and $554,000 for the years ended December 31, 2018 , 2017 and 2016 , respectively.  The PS Business Parks name and logo are owned by PS and licensed to us under a non-exclusive, royalty-free license agreement. The license can be terminated by either party for any reason with six months written notice.  PS provides us property management services for the self-storage component of two assets we own and operates them under the “Public Storage” name. Either the Company or PS can cancel the property management contract upon 60 days’ notice. Under our supervision, PS coordinates and assists in rental and marketing activities, and property maintenance and other operational activities, including the selection of vendors, suppliers, employees and independent contractors. Management fee expenses were $ 96,000 , $ 92,000 and $ 86,000 for the years ended December 31, 2018 , 2017 and 2016 , respectively. Additionally, PS allocated certain operating expenses to us related to the management of these properties totaling $65,000 , $61,000 and $61,000 for the three years ended December 31, 2018 , 2017 and 2016 , respectively. These amounts are included under “cost of operations” on our consolidated statements of income.  Pursuant to a cost sharing agreement, we share certain administrative services, corporate office space, and certain other third party costs with PS which are allocated based upon fair and reasonable estimates of the cost of the services expected to be provided. We reimbursed PS $ 1. 2 million, $ 1. 3 million and $ 1. 1 million, respectively, for costs PS incurred on our behalf for the years ended December 31, 2018 , 2017 and 2016. PS reimbursed us $38,000 , $31,000 and $38,000 costs we incurred on their behalf for the years ended December 31, 2018 , 2017 and 2016 , respectively.   The Company had net amounts due from PS of $ 43,000 at December 31, 2018 and due to PS of $245,000 at December 31, 2017 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, 2018
Shareholders' Equity [Abstract]
Shareholders' Equity	10. Shareholders’ equity  Preferred stock  As of December 31, 2018 and 2017 , the Company had the following series of preferred stock outstanding:     Earliest Potential Dividend Shares Amount  Series Issuance Date Redemption Date Rate Outstanding (in thousands)  Series U September, 2012 September, 2017 5.75% 9,200 $ 230,000  Series V March, 2013 March, 2018 5.70% 4,400 110,000  Series W October, 2016 October, 2021 5.20% 7,590 189,750  Series X September, 2017 September, 2022 5.25% 9,200 230,000  Series Y December, 2017 December, 2022 5.20% 8,000 200,000  Total 38,390 $ 959,750  On January 3, 2018, we completed the redemption of our remaining 6.00% Cumulative Preferred Stock, Series T, at par of $130.0 million. We recorded a Preferred Redemption Allocation of $4.1 million in the three months ended December 31, 2017 and reclassified the shares from equity to “preferred stock called for redemption” on our consolidated balance sheets at December 31, 2017.  On December 7, 2017, we issued $200.0 million or 8,000,000 depositary shares representing interests in our 5.20% Cumulative Preferred Stock, Series Y, at $25.00 per depositary share. The 5.20% Series Y Cumulative Redeemable Preferred Units are non-callable for five years and have no mandatory redemption. We received $193.6 million in net proceeds.  On October 30, 2017, we completed a partial redemption of 8,800,000 of our outstanding 14,000,000 depositary shares representing interests in our 6.0% Cumulative Preferred Stock, Series T, at par of $220.0 million. We recorded a Preferred Redemption Allocation of $6.9 million for the year ended December 31, 2017. On September 21, 2017, we issued $230.0 million or 9,200,000 depositary shares representing interests in our 5.25% Cumulative Preferred Stock, Series X, at $25.00 per depositary share. The 5.25% Series X Cumulative Redeemable Preferred Units are non-callable for five years and have no mandatory redemption. We received $222.2 million in net proceeds.  On December 7, 2016, we called our 6.45 % Cumulative Preferred Stock, Series S, for redemption at par and completed the redemption on January 18, 2017. We recorded a Preferred Redemption Allocation of $7.3 million in the three months ended December 31, 2016 and reclassified the shares from equity to “preferred stock called for redemption” on our consolidated balance sheets at December 31, 2016.  On October 20, 2016, we issued $189.8 million or 7,590,000 depositary shares representing interests in our 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. We received $183.3 million in net proceeds.  We paid $52.6 million, $52.2 million and $57.3 million in distributions to our preferred shareholders for the years ended December 31, 2018 , 2017 and 2016 , respectively.  The holders of our preferred stock have general preference rights with respect to liquidation, quarterly distributions and any accumulated unpaid distributions. Holders of our 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, 2018 , 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 redemption dates noted above. 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.  Common stock and units  We paid $103.8 million ($ 3.80 per common share), $92.5 million ($ 3.40 per common share) and $81.3 million ($ 3.00 per common share) in distributions to our common shareholders for the years ended December 31, 2018 , 2017 and 2016 , respectively . We paid $27.8 million ( $3.80 per common share), $24.8 million ( $3.40 per common share), and $21.9 million ( $3.00 per common share) in distributions to our common unit holders for the years ended December 31, 2018 , 2017 and 2016 , respectively.  The portion of the distributions classified as ordinary income was 99.3% , 95.9% and 100.0% for the years ended December 31, 2018 , 2017 and 2016 , respectively. The portion of the distributions classified as long-term capital gain income was 0.7% , 4.1% and 0.0% for the years ended December 31, 2018 , 2017 and 2016 , respectively. The percentages in the two preceding sentences are unaudited.  During the three months ended June 30, 2018, the Board increased our quarterly dividend from $0.8 5 per common share to $1.05 per common share. During the three months ended March 31, 2017, the Board increased our quarterly dividend from $0. 75 per common share to $0.85 per common share. During the three months ended March 31, 2016, the Board increased our quarterly dividend from $0.60 per common share to $0.75 per common share.  Equity 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. As of December 31, 2018 and 2017 , no equity stock had been issued.

Stock Compensation

Stock Compensation	12 Months Ended
	Dec. 31, 2018
Stock Compensation [Abstract]
Stock Compensation	 11. Stock compensation  Under various share-based compensation plans, PSB grants non-qualified options to purchase the Company’s common shares at a price not less than fair value on the date of grant, as well as RSUs, to certain directors, officers and key employees.  The service period for stock options and RSUs begins when (i) the Company and the recipient reach a mutual understanding of the key terms of the award, (ii) the award has been authorized, (iii) the recipient is affected by changes in the market price of our stock and (iv) it is probable that any performance conditions will be met, and ends when the stock option or RSUs vests.  We account for forfeitures of share-based payments as they occur by reversing previously amortized share-based compensation expense with respect to grants that are forfeited in the period the employee terminates employment. We recorded a cumulative-effect adjustment of $807,000 to decrease accumulated earnings (deficit) and increase paid-in capital representing the impact of estimated forfeitures on our cumulative share-based compensation expense recorded through September 30, 2016.  We amortize the fair value of awards starting at the beginning of the service period as compensation expense. For awards that are earned solely upon the passage of time and continued service, the entire cost of the award is amortized on a straight-line basis over the service period. For awards with performance conditions, the individual cost of each vesting is amortized separately over each individual service period (the “accelerated attribution” method).  Stock Options  Stock options expire 10 years after the grant date and the exercise price is equal to the closing trading price of our common shares on the grant date. Employees cannot require the Company to settle their award in cash. We use the Black-Scholes option valuation model to estimate the fair value of our stock options on the date of grant.     2018 2017 2016  Stock option expense for the year ( in 000's) $ 236 $ 209 $ 282  Aggregate exercise date intrinsic value of options exercised during the year (in 000's) $ 2,752 $ 5,177 $ 3,416   Average assumptions used in valuing options with the Black-Scholes method:  Expected life of options in years, based upon historical experience 5 5 5  Risk-free interest rate 2.8% 1.9% 1.1%  Expected volatility, based upon historical volatility 20.8% 17.5% 15.5%  Expected dividend yield 2.9% 2.8% 2.9%   Average estimated value of options granted during the year $ 18.11 $ 14.42 $ 9.05  As of December 31, 2018 , there was $ 604,000 of unamortized compensation expense related to stock options expected to be recognized over a weighted average period of 3. 3 years.   Cash received from 44,994 stock options exercised during the year ended December 31, 2018 was $3.0 million. Cash received from 73,246 stock options exercised during the year ended December 31, 2017 was $ 4.2 million . Cash received from 68,019 stock options exercised during the year ended December 31, 2016 was $3.9 million. Information with respect to stock options during 2018 , 2017 and 2016 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, 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  Granted 16,000 $ 121.57  Exercised (73,246) $ 57.59  Forfeited — $ —  Outstanding at December 31, 2017 172,409 $ 78.63  Granted 16,000 $ 115.45  Exercised (44,994) $ 66.88  Forfeited — $ —  Outstanding at December 31, 2018 143,415 $ 86.42 5.63 Years $ 6,393  Exercisable at December 31, 2018 82,815 $ 71.36 3.95 Years $ 4,939  RSUs  RSUs granted prior to 2016 are subject to a six -year vesting, with 20% vesting after year two, and 20% vesting after each of the next fo ur years. RSUs granted during and subsequent to 2016 are subject to a five -year vesting at the rate of 20% per year. The grantee receives dividends for each outstanding RSU equal to the per share dividend received by common shareholders. We expense any dividends previously paid upon forfeiture of the related RSU. Upon vesting, the grantee receives common shares equal to the number of vested RSUs, less common shares withheld in exchange for tax withholdings made by the Company to satisfy the grantee’s statutory tax liabilities arising from the vesting. The fair value of our RSUs is determined based upon the applicable closing trading price of our common shares on the date of grant.  Effective March, 2014, the Company entered into a performance-based RSU program, the Senior Management Long-Term Equity Incentive Program for 2014-2017 (“LTEIP”), with certain employees of the Company. Under the LTEIP, the Company established three levels of targeted RSU awards, which would be earned only if the Company achieved one of three defined targets during 2014 to 2017. Under the LTEIP there was 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 was not achieved for an annual award, the RSUs allocated to be awarded for such year were added to the RSUs that may be received if the four-year target was achieved. All RSU awards under the LTEIP vest in four equal annual installments beginning from the date of award. Compensation expense is recognized based on the RSUs expected to be awarded based on the target level that is expected to be achieved. The compensation expense and RSU counts with respect to the LTEIP are included in the aggregate RSU amounts disclosed above. Senior management earned 145,350 RSUs granted in March, 2018 as the maximum targets were achieved for both the year ended December 31, 2017 and for the cumulative four-year period. Information with respect to RSUs during 2018 , 2017 and 2016 is as follows (dollar amounts in thousands):     Weighted  Number of Average Grant  Restricted Stock Units: Units Date Fair Value  Nonvested at December 31, 2015 78,652 $ 6,170  Granted 119,950 10,489  Vested (47,779) (3,844)  Forfeited (6,130) (469)  Nonvested at December 31, 2016 144,693 12,346  Granted 113,750 10,748  Vested (76,994) (6,597)  Forfeited (16,366) (1,381)  Nonvested at December 31, 2017 165,083 15,116  Granted 194,450 18,431  Vested (106,103) (9,256)  Forfeited (10,140) (905)  Nonvested at December 31, 2018 243,290 $ 23,386  As of December 31, 2018 , there was $ 9. 3 million of unamortized compensation expense related to RSUs expected to be recognized over a weighted average period of 3. 6 years.    (In thousands, except number of shares) 2018 2017 2016  Restricted share unit expense $ 3,727 $ 4,279 $ 10,290  Common shares issued upon vesting 62,500 43,223 28,046  Fair value of vested shares on vesting date $ 12,127 $ 8,816 $ 4,699  Cash paid for taxes in lieu of shares upon vesting of RSUs $ 4,981 $ 3,865 $ 1,940 

Supplementary Quarterly Financi

Supplementary Quarterly Financial Data	12 Months Ended
	Dec. 31, 2018
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, 2018 June 30, 2018 September 30, 2018 December 31, 2018  Rental income $ 103,759 $ 101,824 $ 103,808 $ 104,125  Cost of operations $ 33,000 $ 31,256 $ 31,654 $ 30,637  Net income allocable to  common shareholders $ 46,048 $ 70,221 $ 25,131 $ 31,499  Net income per share  Basic $ 1.69 $ 2.57 $ 0.92 $ 1.15  Diluted $ 1.69 $ 2.56 $ 0.92 $ 1.15    Three Months Ended  March 31, 2017 June 30, 2017 September 30, 2017 December 31, 2017  Rental income $ 100,061 $ 99,800 $ 100,481 $ 101,837  Cost of operations $ 31,033 $ 30,250 $ 31,679 $ 32,378  Net income allocable to  common shareholders $ 26,392 $ 24,742 $ 18,138 $ 21,150  Net income per share  Basic $ 0.97 $ 0.91 $ 0.67 $ 0.78  Diluted $ 0.97 $ 0.90 $ 0.66 $ 0.77 

Commitments And Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments And Contingencies [Abstract]
Commitments And Contingencies	13. Commitments and contingencies  The Company currently is neither subject to any 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. 

Schedule III - Real Estate And

Schedule III - Real Estate And Accumulated Depreciation	12 Months Ended
	Dec. 31, 2018
Schedule III - Real Estate And Accumulated Depreciation [Abstract]
Schedule III - Real Estate and Accumulated Depreciation	PS BUSINESS PARKS, INC. SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION DECEMBER 31, 2018 (IN THOUSANDS)     Cost  Capitalized  Subsequent to Gross Carrying Amount at  Initial Cost to Company Acquisition December 31, 2018  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 $ 2,728 $ 3,245 $ 10,431 $ 13,676 $ 7,805 1997 5- 30  Carson Carson, CA 77 990 2,496 1,543 990 4,039 5,029 3,123 1997 5- 30  Cerritos Business Center Cerritos, CA 395 4,218 10,273 4,466 4,218 14,739 18,957 10,948 1997 5- 30  Cerritos/Edwards Cerritos, CA 31 450 1,217 1,535 450 2,752 3,202 2,012 1997 5- 30  Concord Business Park Concord, CA 246 12,454 20,491 1,102 12,454 21,593 34,047 6,583 2011 5- 30  Culver City Culver City, CA 147 3,252 8,157 6,229 3,252 14,386 17,638 11,096 1997 5- 30  Bayview Business Park Fremont, CA 104 4,990 4,831 304 4,990 5,135 10,125 1,848 2011 5- 30  Christy Business Park Fremont, CA 334 11,451 16,254 1,778 11,451 18,032 29,483 6,467 2011 5- 30  Industrial Drive Distribution Center Fremont, CA 199 7,482 6,812 798 7,482 7,610 15,092 2,550 2011 5- 30  Bay Center Business Park Hayward, CA 463 19,052 50,501 3,991 19,052 54,492 73,544 17,064 2011 5- 30  Cabot Distribution Center Hayward, CA 249 5,859 10,811 374 5,859 11,185 17,044 3,265 2011 5- 30  Diablo Business Park Hayward, CA 271 9,102 15,721 914 9,102 16,635 25,737 5,125 2011 5- 30  Eden Landing Hayward, CA 83 3,275 6,174 162 3,275 6,336 9,611 1,992 2011 5- 30  Hayward Business Park Hayward, CA 1,091 28,256 54,418 2,866 28,256 57,284 85,540 17,336 2011 5- 30  Huntwood Business Park Hayward, CA 176 7,391 11,819 745 7,391 12,564 19,955 3,924 2011 5- 30  Parkway Commerce Hayward, CA 407 4,398 10,433 4,573 4,398 15,006 19,404 10,857 1997 5- 30  Laguna Hills Commerce Center Laguna Hills, CA 513 16,261 39,559 7,985 16,261 47,544 63,805 34,283 1997 5- 30  Plaza Del Lago Laguna Hills, CA 101 2,037 5,051 4,099 2,037 9,150 11,187 7,049 1997 5- 30  Canada Business Center Lake Forest, CA 297 5,508 13,785 6,350 5,508 20,135 25,643 14,943 1997 5- 30  Dixon Landing Business Park Milpitas, CA 505 26,301 21,121 3,936 26,301 25,057 51,358 9,193 2011 5- 30  Monterey/Calle Monterey, CA 12 288 706 392 288 1,098 1,386 798 1997 5- 30  Monterey Park Monterey Park, CA 199 3,078 7,862 1,761 3,078 9,623 12,701 7,205 1997 5- 30  Port of Oakland Oakland, CA 200 5,638 11,066 820 5,638 11,886 17,524 3,669 2011 5- 30  Kearney Mesa San Diego, CA 164 2,894 7,089 2,935 2,894 10,024 12,918 7,413 1997 5- 30  Lusk San Diego, CA 371 5,711 14,049 5,958 5,711 20,007 25,718 14,963 1997 5- 30  Rose Canyon Business Park San Diego, CA 233 15,129 20,054 2,491 15,129 22,545 37,674 13,404 2005 5- 30  Charcot Business Park San Jose, CA 283 18,654 17,580 1,853 18,654 19,433 38,087 6,913 2011/2014 5- 30  Las Plumas San Jose, CA 214 4,379 12,889 6,776 4,379 19,665 24,044 15,833 1998 5- 30  Little Orchard Distribution Center San Jose, CA 213 7,725 3,846 718 7,725 4,564 12,289 1,971 2011 5- 30  Montague Industrial Park San Jose, CA 316 14,476 12,807 518 14,476 13,325 27,801 5,172 2011 5- 30  Oakland Road San Jose, CA 177 3,458 8,765 3,291 3,458 12,056 15,514 8,977 1997 5- 30  Rogers Ave San Jose, CA 67 3,540 4,896 576 3,540 5,472 9,012 2,989 2006 5- 30  Doolittle Business Park San Leandro, CA 113 3,929 6,231 480 3,929 6,711 10,640 2,183 2011 5- 30  Bayshore Corporate Center San Mateo, CA 340 25,108 36,891 6,964 25,108 43,855 68,963 13,870 2013 5- 30  San Ramon/Norris Canyon San Ramon, CA 52 1,486 3,642 1,340 1,486 4,982 6,468 3,718 1997 5- 30  Commerce Park Santa Clara, CA 251 17,218 21,914 4,111 17,218 26,025 43,243 17,177 2007 5- 30      Cost  Capitalized  Subsequent to Gross Carrying Amount at  Initial Cost to Company Acquisition December 31, 2018  Buildings Buildings Buildings Depreciable  and and and Accumulated Lives  Description Location Square Feet Land Improvements Improvements Land Improvements Total Depreciation Year(s) Acquired (Years)  Santa Clara Tech Park Santa Clara, CA 178 7,673 15,645 4,575 7,673 20,220 27,893 14,847 2000 5- 30  Walsh at Lafayette Santa Clara, CA 321 13,439 17,890 636 13,439 18,526 31,965 6,584 2011 5- 30  Signal Hill Signal Hill, CA 269 6,693 12,699 3,059 6,693 15,758 22,451 10,178 1997/2006 5- 30  Airport Boulevard So San Francisco, CA 52 899 2,387 812 899 3,199 4,098 2,390 1997 5- 30  South San Francisco/Produce So San Francisco, CA 41 776 1,886 546 776 2,432 3,208 1,804 1997 5- 30  Studio City/Ventura Studio City, CA 22 621 1,530 552 621 2,082 2,703 1,568 1997 5- 30  Kifer Industrial Park Sunnyvale, CA 287 13,227 37,874 1,488 13,227 39,362 52,589 11,696 2011 5- 30  Torrance Torrance, CA 147 2,318 6,069 3,564 2,318 9,633 11,951 7,287 1997 5- 30  Boca Commerce Boca Raton, FL 135 7,795 9,258 3,307 7,795 12,565 20,360 6,142 2006 5- 30  MICC Miami, FL 3,468 95,115 112,583 42,247 95,115 154,830 249,945 96,725 2003/2011/2014 5- 30  Wellington Wellington, FL 263 10,845 18,560 2,583 10,845 21,143 31,988 10,191 2006 5- 30  Ammendale Beltsville, MD 309 4,278 18,380 11,434 4,278 29,814 34,092 23,826 1998 5- 30  Gaithersburg/Christopher Gaithersburg, MD 29 475 1,203 724 475 1,927 2,402 1,461 1997 5- 30  Metro Park North Rockville, MD 898 33,995 94,463 47,901 33,995 142,364 176,359 94,491 2001 5- 30  Parklawn Business Park Rockville, MD 232 3,387 19,628 4,871 3,387 24,499 27,886 10,572 2010 5- 30  The Grove 270 Rockville, MD 578 11,010 58,364 21,236 11,010 79,600 90,610 26,932 2010/2016 5- 30  Westech Business Park Silver Spring, MD 532 25,261 74,572 19,680 25,261 94,252 119,513 59,715 2006 5- 30  Ben White Austin, TX 108 1,550 7,015 1,415 1,550 8,430 9,980 6,134 1998 5- 30  Lamar Business Park Austin, TX 198 2,528 6,596 6,620 2,528 13,216 15,744 10,259 1997 5- 30  McKalla Austin, TX 236 1,945 13,212 2,388 1,945 15,600 17,545 8,499 1998/2012 5- 30  McNeil Austin, TX 525 5,477 24,495 5,014 5,477 29,509 34,986 12,821 1999/2010/2012/2014 5- 30  Rutland Austin, TX 235 2,022 9,397 2,033 2,022 11,430 13,452 8,515 1998/1999 5- 30  Waterford Austin, TX 106 2,108 9,649 3,929 2,108 13,578 15,686 10,058 1999 5- 30  Braker Business Park Austin, TX 257 1,874 13,990 2,522 1,874 16,512 18,386 7,539 2010 5- 30  Mopac Business Park Austin, TX 117 719 3,579 660 719 4,239 4,958 1,888 2010 5- 30  Southpark Business Park Austin, TX 181 1,266 9,882 2,631 1,266 12,513 13,779 5,934 2010 5- 30  Valwood Business Center Carrolton, TX 356 2,510 13,859 2,936 2,510 16,795 19,305 5,721 2013 5- 30  Northway Plaza Farmers Branch, TX 131 1,742 4,503 1,287 1,742 5,790 7,532 1,939 2013 5- 30  Springlake Business Center Farmers Branch, TX 206 2,607 5,715 2,052 2,607 7,767 10,374 3,030 2013/2014 5- 30  Westwood Business Park Farmers Branch, TX 112 941 6,884 2,431 941 9,315 10,256 5,950 2003 5- 30  Eastgate Garland, TX 36 480 1,203 448 480 1,651 2,131 1,282 1997 5- 30  Freeport Business Park Irving, TX 256 4,564 9,506 3,107 4,564 12,613 17,177 4,471 2013 5- 30  NFTZ (1) Irving, TX 231 1,517 6,499 3,527 1,517 10,026 11,543 7,972 1998 5- 30  Royal Tech Irving, TX 794 13,989 54,113 25,400 13,989 79,513 93,502 55,389 1998-2000/2011 5- 30  La Prada Mesquite, TX 56 495 1,235 742 495 1,977 2,472 1,466 1997 5- 30  The Summit Plano, TX 184 1,536 6,654 4,596 1,536 11,250 12,786 8,948 1998 5- 30  Arapaho Business Park Richardson, TX 408 5,226 10,661 4,514 5,226 15,175 20,401 6,046 2013/2014 5- 30  Richardson Business Park Richardson, TX 117 799 3,568 2,987 799 6,555 7,354 5,263 1998 5- 30  Bren Mar Alexandria, VA 113 2,197 5,380 3,905 2,197 9,285 11,482 7,255 1997 5- 30  Eisenhower Alexandria, VA 95 1,440 3,635 2,666 1,440 6,301 7,741 4,997 1997 5- 30  Beaumont Chantilly, VA 107 4,736 11,051 2,250 4,736 13,301 18,037 8,287 2006 5- 30  Dulles South Chantilly, VA 99 1,373 6,810 3,206 1,373 10,016 11,389 7,494 1999 5- 30  Lafayette Chantilly, VA 197 1,680 13,398 6,532 1,680 19,930 21,610 13,959 1999/2000 5- 30  Park East Chantilly, VA 198 3,851 18,029 10,723 3,851 28,752 32,603 21,427 1999 5- 30      Cost  Capitalized  Subsequent to Gross Carrying Amount at  Initial Cost to Company Acquisition December 31, 2018  Buildings Buildings Buildings Depreciable  and and and Accumulated Lives  Description Location Square Feet Land Improvements Improvements Land Improvements Total Depreciation Year(s) Acquired (Years)  Fair Oaks Business Park Fairfax, VA 290 13,598 36,232 9,609 13,598 45,841 59,439 27,723 2004/2007 5- 30  Monroe Herndon, VA 244 6,737 18,911 11,846 6,737 30,757 37,494 22,963 1997/1999 5- 30  Gunston Lorton, VA 247 4,146 17,872 11,997 4,146 29,869 34,015 19,408 1998 5- 30  The Mile McLean, VA 628 38,279 83,596 25,093 38,279 108,689 146,968 48,201 2010/2011 5- 30  Prosperity at Merrifield Merrifield, VA 659 23,147 67,575 36,497 23,147 104,072 127,219 69,488 2001 5- 30  Alban Road Springfield, VA 150 1,935 4,736 4,936 1,935 9,672 11,607 7,811 1997 5- 30  I-95 Springfield, VA 210 3,535 15,672 14,038 3,535 29,710 33,245 22,164 2000 5- 30  Fullterton Road Industrial Park Springfield, VA 243 7,438 24,971 175 7,438 25,146 32,584 638 2018 5- 30  Northern Virginia Industrial Park Springfield, VA 814 18,369 87,258 1,472 18,369 88,730 107,099 2,110 2018 5- 30  Northpointe Sterling, VA 147 2,767 8,778 4,744 2,767 13,522 16,289 10,741 1997/1998 5- 30  Shaw Road Sterling, VA 149 2,969 10,008 4,766 2,969 14,774 17,743 11,709 1998 5- 30  Tysons Corporate Center Vienna, VA 270 9,885 25,302 9,917 9,885 35,219 45,104 15,270 2010 5- 30  Woodbridge Woodbridge, VA 114 1,350 3,398 2,043 1,350 5,441 6,791 4,233 1997 5- 30  212th Business Park Kent, WA 951 19,573 17,695 12,296 19,573 29,991 49,564 11,848 2012 5- 30  Overlake Redmond, WA 411 23,122 41,106 7,333 23,122 48,439 71,561 30,346 2007 5- 30  Renton Renton, WA 28 330 889 645 330 1,534 1,864 1,144 1997 5- 30  Total commercial real estate 28,186 794,842 1,755,422 534,605 794,842 2,290,027 3,084,869 1,238,467  Highgate at the Mile McLean, VA 3 95 units 21,814 84,916 - 21,814 84,916 106,730 2,649 2018 5- 40  Total multi-family 21,814 84,916 - 21,814 84,916 106,730 2,649  Total 28,186 $ 816,656 $ 1,840,338 $ 534,605 $ 816,656 $ 2,374,943 $ 3,191,599 $ 1,241,116 ____________________________  (1) The Company owns two properties that are subject to ground leases in Las Colinas, Texas. These leases expire in 2029 and 20 30 .

Summary Of Significant Accoun_2

Summary Of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2018
Summary Of Significant Accounting Policies [Abstract]
Basis Of Presentation	Basis of presentation  The accompanying consolidated financial statements include the accounts of PSB and its subsidiaries, including the OP and our consolidated joint venture. 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  We consider entities to be Variable Interest Entities (“VIEs”) when they have insufficient equity to finance their activities without additional subordinated financial support provided by other parties, or the equity holders as a group do not have a controlling financial interest. A limited partnership is also generally considered a VIE if the limited partners do not participate in operating decisions. We consolidate VIEs when we are the primary beneficiary, generally defined as having (i) the power to direct the activities most significantly impacting economic performance and (ii) either the obligation to absorb losses or the right to receive benefits from the VIE.  We account for investments in entities that are not VIEs that we have significant influence over, but do not control, using the equity method of accounting and for investment in entities that we control, we consolidate. Prior to January 1, 2018, we had an interest in a joint venture engaged in the development and operation of residential real estate, which we accounted for using the equity method of accounting. On January 1, 2018, we began to consolidate the joint venture in our consolidated financial statements, due to changes to the joint venture agreement that gave the Company control of the joint venture. See Note 4 for more information on this entity.  PS, the sole limited partner in the OP, has no power to direct the activities of the OP. We are the primary beneficiary of the OP. Accordingly, we consider the OP a VIE and consolidate it. Substantially all of our assets and liabilities are held by the OP.
Noncontrolling Interests	Noncontrolling interests  Noncontrolling interests represent (i) PS’s noncontrolling interest in the OP through its ownership of 7,305,355 common partnership units and (ii) a third-party 5.0% interest in our consolidated joint venture owning a 395 -unit multifamily apartment complex. See Note 8 for further information on noncontrolling interests.
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. Customer receivables are net of an allowance for estimated uncollectible accounts totaling $ 400,000 at both December 31, 2018 and 2017 . Deferred rent receivable is net of an allowance for uncollectible accounts totaling $876,000 and $867,000 at December 31, 2018 and 2017 , 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 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 various 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.  The following table provides a reconciliation of cash, cash equivalents and restricted cash per the consolidated statements of cash flow to the corresponding financial statement line items in the consolidated balance sheets as of December 31, 2018 , 2017 and 2016 (in thousands) :     For The Years Ended December 31,  2018 2017 2016  Consolidated balance sheets  Cash and cash equivalents $ 37,379 $ 114,882 $ 128,629  Restricted cash included in  Land and building held for development 1,088 1,088 —  Consolidated statements of cash flows $ 38,467 $ 115,970 $ 128,629  During 2017, in conjunction with seeking entitlements to develop our multifamily projects in Tysons, Virginia, we contributed $1.1 million into an escrow account for the future development of an athletic field.  Carrying values of the Company’s unsecured Credit Facility (as defined below) 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. Property taxes, insurance, interest and costs essential to the development of property for its intended use are capitalized during the period of development. Direct 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 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, for leases with terms greater than one year are capitalized and depreciated over their estimated useful lives.
Property Held For Sale Or Development	Property held for sale or development  Real estate is classified as held for sale when the asset is being marketed for sale and we expect that a sale is likely to occur in the next 12 months. Real estate is classified as held for development when it is no longer used in its original form and likely that it will be developed to an alternate use. Property held for development or sale is not depreciated.
Intangible Assets/Liabilities	Intangible assets/liabilities  When we acquire real estate facilities, an intangible asset is recorded as other assets for leases where the in-place rent is higher than market rents, and an intangible liability is recorded as other liabilities where the market rents are higher than the in-place rents. The amounts recorded are based upon the present value (using a discount rate which reflects the risks associated with the leases acquired) of such differences over the lease term and such amounts are amortized to rental income over the respective remaining lease term. As of December 31, 2018 , the value of above-market in-place rents resulted in net intangible assets of $1.8 million, net of $10.0 million of accumulated amortization and the value of below-market in-place rents resulted in net intangible liabilities of $1.8 million, net of $10.8 million of accumulated amortization. As of December 31, 2017 , the value of above-market in-place rents resulted in net intangible assets of $731,000 , net of $9.5 million of accumulated amortization and the value of below-market in-place rents resulted in net intangible liabilities of $383,000 , net of $10. 4 million of accumulated amortization.  Additionally, when we acquire real estate facilities, the value of in-place leases (i.e. customer lease-up costs) is recorded as other assets and is amortized to depreciation and amortization expense over the respective remaining lease term. As of December 31, 2018 , the value of acquired in-place leases resulted in net intangible assets of $4.7 million, net of $1.3 million of accumulated amortization. As of December 31, 2017 , we had no in-place lease intangibles on our consolidated balance sheet.
Evaluation Of Asset Impairment	Evaluation of asset impairment  We evaluate our real estate and finite-lived intangible assets for impairment each quarter. If there are indicators of impairment and we determine that the carrying value of the asset is not recoverable from estimated future undiscounted cash flows to be received through the asset’s remaining life (or, if earlier, the expected disposal date), we record an impairment charge to the extent the carrying amount exceeds the asset’s estimated fair value or net proceeds from expected disposal.  We evaluate our investment in our unconsolidated joint venture on a quarterly basis. We record an impairment charge to the extent the carrying amount exceeds estimated fair value, when we believe any such shortfall is other than temporary.  No impairment charges were recorded in any period presented herein.
Asset Impairment Due to Casualty Loss	Asset impairment due to casualty loss  It is our policy to record losses due to physical damages during the accounting period in which they occur, while the amount of monetary assets to be received from the insurance policy is recognized when receipt of insurance recoveries is probable. Losses, which are reduced by the related probable insurance recoveries, are recorded as costs of operations on the consolidated statements of income. Anticipated proceeds in excess of recognized losses would be considered a gain contingency and recognized when the contingency related to the insurance claim has been resolved. Anticipated recoveries for lost rental income due to property damages are also considered to be a gain contingency and recognized when the contingency related to the insurance claim has been resolved.  No material casualty losses were incurred in any period presented herein.
Stock Compensation	Stock compensation  Share-based payments to employees, including grants of employe e stock options, are recognized as stock compensation in the Company’s consolidated statements of income based on their grant date fair values, except for performance-based grants, which are accounted for based on their fair values at the beginning of the service period. See Note 11.
Accrued And Other Liabilities And Other Assets	Accrued and other liabilities and other assets  Accrued and other liabilities consist primarily of rents prepaid by our customers, trade payables, property tax accruals, accrued payroll and contingent loss accruals when probable and estimable, as well as the intangible liabilities discussed above. We disclose the nature of significant unaccrued losses that are reasonably possible of occurring and, if estimable, a range of exposure.  Other assets are comprised primarily of prepaid expenses as well as the intangible assets discussed above.  We believe the fair value of our accrued and other liabilities and other assets approximate book value, due to the short period until settlement.
Revenue Recognition	Revenue recognition  We recognize the aggregate rent to be collected (including the impact of escalators and concessions) under leases ratably throughout the non-cancellable lease term on a “Straight-Line” basis, commencing when the customer takes control of the leased space. Cumulative Straight-Line rent recognized in excess of amounts billed per the lease terms is presented as “deferred rent receivable” on our consolidated balance sheets. Reimbursements from customers 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 as other income.  Costs incurred in acquiring customers (primarily tenant improvements and lease commissions) are capitalized and amortized over the lease period for leases with terms greater than one year .
Sales Of Real Estate Facilities	Sales of real estate facilities  Sales of real estate facilities are not part of our ordinary activities, and as a result, we consider such sales as contracts with non-customers. We recognize sales of real estate when we have collected payment and the attributes of ownership such as possession and control of the asset have been transferred to the buyer. If a contract for sale includes obligations to provide goods or services to the buyer, an allocated portion of the contract price is recognized as revenue as the related goods or services are transferred to the buyer.
General And Administrative Expenses	General and administrative expenses  General and administrative expenses include executive and other compensation, corporate office expenses, professional fees, state income taxes and other such costs that are not directly related to the operation of our real estate facilities.
Income Taxes	Income taxes  We have elected to be treated as a REIT, as defined in the Internal Revenue Code of 1986, as amended (the “Code”). As a REIT, we do not incur federal income tax if we distribute substantially all of our “REIT taxable income” each year, and if we meet certain organizational and operational rules. We believe we have met these REIT requirements for all periods presented herein. Accordingly, we have recorded no federal income tax expense related to our “REIT taxable income.”  We recognize tax benefits of uncertain income tax positions that are subject to audit only if we believe it is more likely than not that the position would ultimately be sustained assuming the relevant taxing authorities had full knowledge of the relevant facts and circumstances of our positions. As of December 31, 2018 and 2017 , we did not recognize any tax benefit for uncertain tax positions.
Accounting For Preferred Equity Issuance Costs	Accounting for preferred equity issuance costs  We record issuance costs as a reduction to paid-in capital on our consolidated balance sheets at the time the preferred securities are issued and reflect the carrying value of the preferred equity at its redemption value. An additional allocation of income is made from the common shareholders to the preferred shareholders in the amount of the original issuance costs, and we reclassify the redemption value from equity to liabilities when we call preferred shares for redemption.
Net Income Per Common Share	Net income per common share  Notwithstanding the presentation of income allocations on our consolidated statements of income, net income is allocated to (a) preferred shareholders, for distributions paid or payable, (b) preferred shareholders, to the extent redemption value exceeds the related carrying value (a “Preferred Redemption Allocation”) and (c) restricted stock unit (“RSU”) holders, for non-forfeitable dividends paid adjusted for participation rights in undistributed earnings. The remaining net income is allocated to the common partnership units and our common shareholders, respectively, based upon the pro-rata aggregate number of units and shares outstanding.  Basic and diluted net income per common share are each calculated based upon net income allocable to common shareholders, divided by (i) in the case of basic net income per common share, weighted average common shares and (ii) in the case of diluted income per share, weighted average common shares adjusted for the impact of stock compensation awards outstanding (Note 11) using the treasury stock method.  The following tables set forth the calculation of the components of our basic and diluted income per share that are not reflected on the face of our consolidated statements of income, including the allocation of income to common shareholders and common partnership units, the percentage of weighted average shares and common partnership units, as well as basic and diluted weighted average shares for the years ended December 31, ( in thousands ):      2018 2017 2016  Calculation of net income allocable to common shareholders  Net income $ 271,901 $ 179,316 $ 144,984  Net (income) loss allocated to  Preferred shareholders based upon distributions (51,880) (52,873) (57,276)  Preferred shareholders based upon redemptions — (10,978) (7,312)  Noncontrolling interests—joint venture 1,030 — —  Restricted stock unit holders (1,923) (761) (569)  Net income allocable to common shareholders  and noncontrolling interests—common units 219,128 114,704 79,827  Net income allocation to noncontrolling interests—  common units (46,229) (24,279) (16,955)  Net income allocable to common shareholders $ 172,899 $ 90,425 $ 62,872   Calculation of common partnership units as a percentage of common share equivalents  Weighted average common shares outstanding 27,321 27,207 27,089  Weighted average common partnership units outstanding 7,305 7,305 7,305  Total common share equivalents 34,626 34,512 34,394  Common partnership units as a percentage of common  share equivalents 21.1% 21.2% 21.2%   Weighted average common shares outstanding  Basic weighted average common shares outstanding 27,321 27,207 27,089  Net effect of dilutive stock compensation — based on  treasury stock method using average market price 101 205 90  Diluted weighted average common shares outstanding 27,422 27,412 27,179 
Segment Reporting	Segment reporting  The Company views its operations as one segment . We have two operating segments: (i) the acquisition, development, ownership and management of commercial real estate and (ii) the acquisition, development, ownership and management of multifamily real estate, but have one reportable segment as the multifamily segment does not meet the quantitative thresholds necessary to require reporting as a separate segment.
Reclassifications	Reclassifications  Certain reclassifications have been made to the consolidated financial statements for 2016 in order to conform to the 2018 presentation, including reclassifying management fee income totaling $518,000 for the year ended December 31, 2016 into “interest and other income” on our consolidated statements of income.
Recently Issued Accounting Standards	Recently issued accounting standards  In May 2014 and February 2016, the Financial Accounting Standards Board (“FASB”) issued two Accounting Standards Updates (“ASU”s), ASU 2014-09, Revenue from Contracts with Customers (the “Revenue Standard”), and ASU 2016-02, Leases (the “Lease Standard”). These standards apply to substantially all of our revenue generating activities, as well as provide a model to account for the disposition of real estate facilities to non-customers, which is governed under ASU 2017-05, Other Income - Gains and losses from the Derecognition of Nonfinancial Assets , clarifying the scope of asset derecognition guidance and accounting for partial sales of nonfinancial assets.  The Lease Standard will direct how we account for payments from the elements of our leases that are generally fixed and determinable at the inception of the lease (“Fixed Lease Payments”) while the Revenue Standard will direct how we account for the non-lease components of our lease contracts, primarily expense reimbursements (“Non-Lease Payments”). The adoption of the Revenue Standard and its impact on our accounting for the disposition of real estate facilities is described below.  The Lease Standard requires us to identify Fixed Lease Payments and Non-Lease Payments of a lease agreement and will govern the recognition of revenue for the Fixed Lease Payments. Revenue related to Non-Lease Payments under our lease arrangements will be subject to the Revenue Standard effective upon adoption of the Lease Standard. See further discussion below on Fixed Lease Payments and Non-Lease Payments.  Under the Lease Standard, a set of practical expedients for implementation, which must be elected as a package and for all leases, may be elected. These practical expedients include (i) relief from re-assessing whether an expired or existing contract meets the definition of a lease, (ii) relief from re-assessing the classification of expired or existing leases at the adoption date and (iii) allowing previously capitalized initial direct leasing costs to continue to be amortized. We elected the practical expedient package upon adoption of the Lease Standard on January 1, 2019.  We implemented the Lease Standard on its effective date of January 1, 2019 using the required modified retrospective transition approach (with certain transition relief that is available to us). The modified retrospective approach will require us to first record an adjustment to the January 1, 2017 balance of accumulated earnings (deficit) for the cumulative impact of the Lease Standard on all leases existing at January 1, 2017. Then, we will have to restate the financial statements for the years ended December 31, 2017 and 2018 for the Lease Standard impact on all leases that were in force at any time during those periods. In July, 2018, the FASB issued an amendment to the transition method that allows adoption on January 1, 2019 with a cumulative effect adjustment as of January 1, 2019, with no restatement of prior periods. We elected this transition method upon adoption of the Lease Standard on January 1, 2019.  Lessor Accounting  We recognized revenue from our lease arrangements aggregating $413.5 million for the year ended December 31, 2018 . This revenue consisted primarily of rental income and expense reimbursements of $322.3 million and $91.2 million , respectively.  Under the accounting standards in effect prior to January 1, 2019, we are required to account for Fixed Lease Payments on a straight-line basis, with the expected fixed payments recognized ratably over the term of the lease. Payments for expense reimbursements received under these lease arrangements related to our customer’s pro rata share of real estate taxes, insurance, utilities, repairs and maintenance, common area expense and other operating expenses are considered Fixed Lease Payments. We recognize these reimbursements as revenue when the related contractually recoverable operating expenses are incurred.  Under the Lease Standard, the total consideration in each lease agreement will be allocated to the Fixed Lease Payment and Non-Lease Payments based on their relative standalone selling prices. Lessors will continue to recognize the Fixed Lease Payments on a straight-line basis, which is consistent with existing guidance for operating leases. The issued amendment to the Lease Standard noted above also allows lessors to elect, as a practical expedient, not to allocate the total consideration to Fixed Lease Payments and Non-Lease Payments based on their relative standalone selling prices. This practical expedient allows lessors to elect a combined single component presentation if (i) the timing and pattern of the revenue recognition for the Fixed Lease Payments and Non-Lease Payments are the same, and (ii) the combined single component of the lease would continue to be classified as an operating lease.  We do not expect that the Lease Standard will impact our accounting for Fixed Lease Payments, because our accounting policy is currently consistent with the provisions of the standard. Upon adoption of the Lease Standard, we expect to adopt the practical expedient, specifically related to payments for expense reimbursements that qualify as Non-Lease Payments to be presented under a single lease component presentation, which would otherwise be accounted for under the Revenue Standard. We believe the two conditions have been met for Non-Lease Payments as (i) the timing and pattern of transfer of the Fixed Lease Payments and Non-Lease Payments are the same, and (ii) the combined single component of the lease would be classified as an operating lease. Costs to execute leases  The Lease Standard also provides updated guidance on the requirements for the capitalization of the incremental costs incurred in executing leases, such as legal fees and commissions. Under the Lease Standard, any costs that would have been incurred regardless of successful lease execution, such as allocated costs of internal personnel, are to be expensed and may not be capitalized. As we do not currently capitalize any such costs, we do not expect this component of the Lease Standard to have a material effect to our consolidated financial statements.  Lessee accounting  Under the Lease Standard, lessees are required to apply a dual approach by classifying leases as either finance or operating leases based on the principle whether the lease is effectively a finance purchase of the leased asset by the lessee. This classification will determine whether the lease expense is recognized based on an effective interest method or a straight-line basis over the term of the lease. F or most leases with a term of greater than 12 months, in which we are the lessee, the present value of future lease payments will be recognized on our balance sheet as a right-of-use asset and related liability. We do not expect a material impact to our consolidated financial statements from the initial recognition of each lease liability upon the adoption, nor from the pattern of recognition subsequent to adoption.  The Revenue Standard  In May, 2014, the FASB issued the Revenue Standard on recognition of revenue arising from contracts with customers, as well as the accounting for the disposition of real estate facilities, and subsequently, issued additional guidance that further clarified the standard. Rental income from leasing arrangements is a substantial portion of our revenues and is specifically excluded from the Revenue Standard and will be governed by the Lease Standard (discussed above).  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 Revenue Standard permits either the full retrospective or modified retrospective transition method. We adopted the Revenue Standard effective January 1, 2018 utilizing the modified retrospective transition method applied to contracts not completed as of January 1, 2018 and the adoption did not result in a material impact to our consolidated financial statements.  Revenue within the scope of the Revenue Standard  Sales of Real Estate Facilities  Under the Revenue Standard, which includes guidance on recognition of gains and losses arising from the derecognition of nonfinancial assets in a transaction with non-customers, the derecognition model is based on the transfer of control of nonfinancial assets or in substance nonfinancial assets that do not meet the definition of a business. Generally, our sales of real estate facilities would be considered a sale of a nonfinancial asset to non-customers. If we determine we do not have a controlling financial interest in the entity that holds the asset and the arrangement meets the criteria to be accounted for as a contract, we would derecognize the asset and recognize a gain or loss on the sale of the real estate facilities accounted under the revenue recognition principles under the Revenue Standard.  The adoption of the Revenue Standard had no material impact on the recognition of $93.5 million in gain on sale of real estate facilities during the year ended December 31, 2018.

Summary Of Significant Accoun_3

Summary Of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Summary Of Significant Accounting Policies [Abstract]
Reconciliation of Cash, Cash Equivalents and Restricted Cash	   For The Years Ended December 31,  2018 2017 2016  Consolidated balance sheets  Cash and cash equivalents $ 37,379 $ 114,882 $ 128,629  Restricted cash included in  Land and building held for development 1,088 1,088 —  Consolidated statements of cash flows $ 38,467 $ 115,970 $ 128,629 
Calculation Of Earnings Per Share	    2018 2017 2016  Calculation of net income allocable to common shareholders  Net income $ 271,901 $ 179,316 $ 144,984  Net (income) loss allocated to  Preferred shareholders based upon distributions (51,880) (52,873) (57,276)  Preferred shareholders based upon redemptions — (10,978) (7,312)  Noncontrolling interests—joint venture 1,030 — —  Restricted stock unit holders (1,923) (761) (569)  Net income allocable to common shareholders  and noncontrolling interests—common units 219,128 114,704 79,827  Net income allocation to noncontrolling interests—  common units (46,229) (24,279) (16,955)  Net income allocable to common shareholders $ 172,899 $ 90,425 $ 62,872   Calculation of common partnership units as a percentage of common share equivalents  Weighted average common shares outstanding 27,321 27,207 27,089  Weighted average common partnership units outstanding 7,305 7,305 7,305  Total common share equivalents 34,626 34,512 34,394  Common partnership units as a percentage of common  share equivalents 21.1% 21.2% 21.2%   Weighted average common shares outstanding  Basic weighted average common shares outstanding 27,321 27,207 27,089  Net effect of dilutive stock compensation — based on  treasury stock method using average market price 101 205 90  Diluted weighted average common shares outstanding 27,422 27,412 27,179 

Real Estate Facilities (Tables)

Real Estate Facilities (Tables)	12 Months Ended
	Dec. 31, 2018
Real Estate Properties [Line Items]
Activity In Real Estate Facilities	   Buildings and Accumulated  Land Improvements Depreciation Total  Balances at December 31, 2015 $ 773,074 $ 2,109,097 $ (1,010,197) $ 1,871,974  Acquisition of real estate facilities 5,638 7,637 — 13,275  Capital expenditures — 37,232 — 37,232  Disposals (1) — (14,411) 14,411 —  Depreciation and amortization expense — — (99,486) (99,486)  Transfer to land and building held for development (9,676) (19,092) 7,870 (20,898)  Transfer to properties held for sale — (1,251) 3,316 2,065  Balances at December 31, 2016 769,036 2,119,212 (1,084,086) 1,804,162  Capital expenditures — 51,909 — 51,909  Disposals (1) — (13,919) 13,919 —  Depreciation and amortization expense — — (94,270) (94,270)  Transfer to properties held for sale — (340) 2,639 2,299  Balances at December 31, 2017 (2) 769,036 2,156,862 (1,161,798) 1,764,100  Acquisition of real estate facility 25,806 112,230 — 138,036  Consolidation of joint venture 21,814 84,903 — 106,717  Capital expenditures — 38,904 — 38,904  Disposals (1) — (17,345) 17,345 —  Depreciation and amortization expense — — (96,732) (96,732)  Transfer to properties held for sale — (611) 69 (542)  Balances at December 31, 2018 $ 816,656 $ 2,374,943 $ (1,241,116) $ 1,950,483  ____________________________ (1) Disposals primarily represent the book value of tenant improvements that have been removed upon the customer vacating their space. (2) We reclassified seven multi-tenant flex buildings totaling 194,000 square feet located in Dallas, Texas, as properties held for sale as of December 31, 2017.
Summary Of Real Estate Assets Acquired And Liabilities Assumed	   2018 2017 2016  Land $ 25,806 $ — $ 5,638  Buildings and improvements 112,230 — 7,637  Other assets (above-market in-place rents) 1,487 — —  Accrued and other liabilities (below-market in-place rents) (1,790) — (25)  Other assets (in-place lease value) 6,033 — —  Total purchase price 143,766 — 13,250  Net operating assets acquired and liabilities assumed (1,367) — (622)  Total cash paid $ 142,399 $ — $ 12,628 
JV Partner [Member]
Real Estate Properties [Line Items]
Summary Of Real Estate Assets Acquired And Liabilities Assumed	   Land $ 21,814  Buildings and improvements 84,903  Other assets (in-place lease value) 1,199  Total consolidated joint venture 107,916  Noncontrolling interest in consolidated joint venture (4,032)  Net book value of joint venture at consolidation $ 103,884 

Leasing Activity (Tables)

Leasing Activity (Tables)	12 Months Ended
	Dec. 31, 2018
Leasing Activity [Abstract]
Summary Of Future Minimum Rental Revenues Excluding Recovery Of Operating Expenses	   2019 $ 289,220  2020 223,015  2021 164,039  2022 111,253  2023 73,019  Thereafter 112,059  Total $ 972,605 

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2018
Shareholders' Equity [Abstract]
Schedule Of Preferred Stock Outstanding	   Earliest Potential Dividend Shares Amount  Series Issuance Date Redemption Date Rate Outstanding (in thousands)  Series U September, 2012 September, 2017 5.75% 9,200 $ 230,000  Series V March, 2013 March, 2018 5.70% 4,400 110,000  Series W October, 2016 October, 2021 5.20% 7,590 189,750  Series X September, 2017 September, 2022 5.25% 9,200 230,000  Series Y December, 2017 December, 2022 5.20% 8,000 200,000  Total 38,390 $ 959,750 

Stock Compensation (Tables)

Stock Compensation (Tables)	12 Months Ended
	Dec. 31, 2018
Stock Compensation [Abstract]
Schedule of Valuation Assumptions	   2018 2017 2016  Stock option expense for the year ( in 000's) $ 236 $ 209 $ 282  Aggregate exercise date intrinsic value of options exercised during the year (in 000's) $ 2,752 $ 5,177 $ 3,416   Average assumptions used in valuing options with the Black-Scholes method:  Expected life of options in years, based upon historical experience 5 5 5  Risk-free interest rate 2.8% 1.9% 1.1%  Expected volatility, based upon historical volatility 20.8% 17.5% 15.5%  Expected dividend yield 2.9% 2.8% 2.9%   Average estimated value of options granted during the year $ 18.11 $ 14.42 $ 9.05 
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, 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  Granted 16,000 $ 121.57  Exercised (73,246) $ 57.59  Forfeited — $ —  Outstanding at December 31, 2017 172,409 $ 78.63  Granted 16,000 $ 115.45  Exercised (44,994) $ 66.88  Forfeited — $ —  Outstanding at December 31, 2018 143,415 $ 86.42 5.63 Years $ 6,393  Exercisable at December 31, 2018 82,815 $ 71.36 3.95 Years $ 4,939 
Nonvested Restricted Stock Units	   Weighted  Number of Average Grant  Restricted Stock Units: Units Date Fair Value  Nonvested at December 31, 2015 78,652 $ 6,170  Granted 119,950 10,489  Vested (47,779) (3,844)  Forfeited (6,130) (469)  Nonvested at December 31, 2016 144,693 12,346  Granted 113,750 10,748  Vested (76,994) (6,597)  Forfeited (16,366) (1,381)  Nonvested at December 31, 2017 165,083 15,116  Granted 194,450 18,431  Vested (106,103) (9,256)  Forfeited (10,140) (905)  Nonvested at December 31, 2018 243,290 $ 23,386 
Schedule of Restricted Stock Unit Activity	   (In thousands, except number of shares) 2018 2017 2016  Restricted share unit expense $ 3,727 $ 4,279 $ 10,290  Common shares issued upon vesting 62,500 43,223 28,046  Fair value of vested shares on vesting date $ 12,127 $ 8,816 $ 4,699  Cash paid for taxes in lieu of shares upon vesting of RSUs $ 4,981 $ 3,865 $ 1,940 

Supplementary Quarterly Finan_2

Supplementary Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2018
Supplementary Quarterly Financial Data [Abstract]
Schedule Of Supplemental Quarterly Financial Data	   Three Months Ended  March 31, 2018 June 30, 2018 September 30, 2018 December 31, 2018  Rental income $ 103,759 $ 101,824 $ 103,808 $ 104,125  Cost of operations $ 33,000 $ 31,256 $ 31,654 $ 30,637  Net income allocable to  common shareholders $ 46,048 $ 70,221 $ 25,131 $ 31,499  Net income per share  Basic $ 1.69 $ 2.57 $ 0.92 $ 1.15  Diluted $ 1.69 $ 2.56 $ 0.92 $ 1.15    Three Months Ended  March 31, 2017 June 30, 2017 September 30, 2017 December 31, 2017  Rental income $ 100,061 $ 99,800 $ 100,481 $ 101,837  Cost of operations $ 31,033 $ 30,250 $ 31,679 $ 32,378  Net income allocable to  common shareholders $ 26,392 $ 24,742 $ 18,138 $ 21,150  Net income per share  Basic $ 0.97 $ 0.91 $ 0.67 $ 0.78  Diluted $ 0.97 $ 0.90 $ 0.66 $ 0.77 

Organization And Description _2

Organization And Description Of Business (Narrative) (Details) ft² in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2018ft²statepropertyshares
Organization And Description Of Business [Line Items]
The Company's ownership percentage of the limited partnership	78.90%
Owned and operated properties (in rentable square feet)	28,200
Number of states with rentable commercial space | state	6
Number of units in multi-family asset | property	395
Managed properties (in rentable square feet)	450
PS [Member]
Organization And Description Of Business [Line Items]
Affiliate's percent ownership of the Company's common equity	41.70%
Shares owned by Public Storage | shares	14.5
Investment in Unconsolidated Joint Venture [Member]
Organization And Description Of Business [Line Items]
Economic interest in joint venture, percentage	95.00%

Summary Of Significant Accoun_4

Summary Of Significant Accounting Policies (Narrative) (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2018USD ($)segmentpropertyshares	Dec. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)shares
Summary Of Significant Accounting Policies [Line Items]
Common units in operating partnership | shares									7,305,355	7,305,000	7,305,000
Number of units in multi-family asset | property									395
Allowance for uncollectible accounts	$ 400,000				$ 400,000				$ 400,000	$ 400,000
Allowance for uncollectable deferred rent receivables	876,000				867,000				$ 876,000	867,000
Cash and cash equivalents maximum benchmark (in months)									3 months
Restricted cash	1,088,000				1,088,000				$ 1,088,000	1,088,000
Minimum expected future benefit period on expenditures cost to be capitalized and depreciated (in years)									2 years
Minimum expected future benefit period on transaction cost to be capitalized and depreciated (in years)									1 year
Length of time criteria for expected sale of assets to be classified as properties held for disposition									12 months
Below market lease, net	1,800,000				383,000				$ 1,800,000	383,000
Below market leases, accumulated amortization	10,800,000				10,400,000				10,800,000	10,400,000
Impairment on assets									0	0
Impairment due to casualty loss									0	0
Income tax expense									0
Tax benefit for uncertain tax positions									$ 0	0
Number of operating segments | segment									2
Number of reportable segments | segment									1
Rental income (excluding expense reimbursements)									$ 322,300,000
Expense reimbursements									91,200,000	90,800,000	$ 82,600,000
Gain on sale of real estate facilities									93,484,000	1,209,000
Facility management fee	104,125,000	$ 103,808,000	$ 101,824,000	$ 103,759,000	101,837,000	$ 100,481,000	$ 99,800,000	$ 100,061,000	413,516,000	402,179,000	386,871,000
Above Market Leases [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived intangible assets, net	1,800,000				731,000				1,800,000	731,000
Finite-lived intangible assets, accumulated amortization	10,000,000				9,500,000				10,000,000	9,500,000
Acquired In Place Leases [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived intangible assets, net	4,700,000				$ 0				4,700,000	0
Finite-lived intangible assets, accumulated amortization	$ 1,300,000								$ 1,300,000
JV Partner [Member]
Summary Of Significant Accounting Policies [Line Items]
Consolidated entity ownership percentage	5.00%								5.00%
Minimum [Member] | Buildings And Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life (in years)									5 years
Maximum [Member] | Buildings And Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life (in years)									30 years
Property Management [Member]
Summary Of Significant Accounting Policies [Line Items]
Facility management fee									$ 407,000	$ 506,000	$ 518,000

Summary Of Significant Accoun_5

Summary Of Significant Accounting Policies (Reconciliation of Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summary Of Significant Accounting Policies [Abstract]
Cash and cash equivalents	$ 37,379	$ 114,882	$ 128,629
Restricted cash included in - Land and building held for development	1,088	1,088
Consolidated statements of cash flows	$ 38,467	$ 115,970	$ 128,629	$ 188,912

Summary Of Significant Accoun_6

Summary Of Significant Accounting Policies (Calculation Of Earnings Per Share) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary Of Significant Accounting Policies [Abstract]
Net income									$ 271,901	$ 179,316	$ 144,984
Net (income) loss allocated to Preferred shareholders based upon distributions									(51,880)	(52,873)	(57,276)
Net (income) loss allocated to Preferred shareholders based upon redemptions										(10,978)	(7,312)
Net (income) loss allocated to Noncontrolling interest - joint venture									1,030
Net (income) loss allocated to Restricted stock unit holders									(1,923)	(761)	(569)
Net income allocable to common shareholders and noncontrolling interests- common units									219,128	114,704	79,827
Net income allocation to noncontrolling interests - common units									(46,229)	(24,279)	(16,955)
Net income allocable to common shareholders	$ 31,499	$ 25,131	$ 70,221	$ 46,048	$ 21,150	$ 18,138	$ 24,742	$ 26,392	$ 172,899	$ 90,425	$ 62,872
Weighted average common shares outstanding									27,321,000	27,207,000	27,089,000
Weighted average common partnership units outstanding									7,305,355	7,305,000	7,305,000
Total common share equivalents									34,626,000	34,512,000	34,394,000
Common partnership units as a percentage of common share equivalents									21.10%	21.20%	21.20%
Net effect of dilutive stock compensation - based on treasury stock method using average market price									101,000	205,000	90,000
Diluted weighted average common shares outstanding									27,422,000	27,412,000	27,179,000

Real Estate Facilities (Narrati

Real Estate Facilities (Narrative) (Details)

Oct. 31, 2018USD ($)ft²item

Jun. 08, 2018USD ($)ft²property

Apr. 30, 2018USD ($)ft²item

Apr. 18, 2018USD ($)ft²item

Mar. 05, 2018USD ($)ft²item

May 01, 2017USD ($)ft²item

Mar. 31, 2017USD ($)

Dec. 31, 2018USD ($)ft²

Dec. 31, 2017USD ($)

Dec. 31, 2016USD ($)

Nov. 01, 2016ft²

Sep. 28, 2016USD ($)ft²property

Real Estate Facilities [Line Items]

Total sale price of development rights

$ 6,500,000

Payments received for sale of development rights, net

$ 6,400,000

$ 4,900,000

$ 1,500,000

Gain on sale of development rights

6,365,000

Federal income tax basis of real estate facilities

$ 1,900,000,000

Purchase price

$ 143,766,000

0

13,250,000

Acquisition transaction costs

$ 328,000

Area of real estate property (in square feet) | ft²

28,186,000

Proceeds from sale of real estate facilities

$ 145,097,000

2,144,000

Gain on sale of real estate facilities

93,484,000

$ 1,209,000

Committed transaction costs for executed leases

$ 9,800,000

Multi-Tenant Industrial Park Acquisition [Member]

Real Estate Facilities [Line Items]

Business acquisition, date of acquisition agreement

Jun. 8, 2018

Purchase price

$ 143,800,000

Number of parks acquired | property

2

Number of square foot acquired | ft²

1,100,000

Multi-Tenant Office Building Acquisition [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

Area of real estate property (in square feet) | ft²

226,000

Empire Commerce, Dallas Texas [Member]

Real Estate Facilities [Line Items]

Number of buildings disposed | item

2

Disposal date of real estate

May 1, 2017

Area of real estate property (in square feet) | ft²

44,000

Proceeds from sale of real estate facilities

$ 2,100,000

Gain on sale of real estate facilities

$ 1,200,000

Corporate Pointe Business Park [Member]

Real Estate Facilities [Line Items]

Disposal date of real estate

Mar. 5, 2018

Number of buildings sold | item

5

Area of real estate property (in square feet) | ft²

161,000

Proceeds from sale of real estate facilities

$ 41,700,000

Gain on sale of real estate facilities

$ 26,800,000

Orange County Business Center [Member]

Real Estate Facilities [Line Items]

Disposal date of real estate

Apr. 18, 2018

Number of buildings sold | item

5

Area of real estate property (in square feet) | ft²

437,000

Proceeds from sale of real estate facilities

$ 73,300,000

Gain on sale of real estate facilities

$ 50,600,000

Northgate Business Park [Member]

Real Estate Facilities [Line Items]

Disposal date of real estate

Apr. 30, 2018

Number of buildings sold | item

7

Area of real estate property (in square feet) | ft²

194,000

Proceeds from sale of real estate facilities

$ 11,800,000

Gain on sale of real estate facilities

$ 7,900,000

Orangewood Office Park [Member]

Real Estate Facilities [Line Items]

Disposal date of real estate

Oct. 31, 2018

Number of buildings sold | item

2

Area of real estate property (in square feet) | ft²

107,000

Proceeds from sale of real estate facilities

$ 18,300,000

Gain on sale of real estate facilities

$ 8,200,000

The Mile [Member]

Real Estate Facilities [Line Items]

Area of real estate property (in square feet) | ft²

123,000

Real Estate Facilities (Activit

Real Estate Facilities (Activity In Real Estate Facilities) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)ft²property	Dec. 31, 2016USD ($)
Property, Plant and Equipment [Line Items]
Beginning Balances	$ 1,764,100	$ 1,804,162	$ 1,871,974
Accumulated Depreciation, Beginning Balances	(1,161,798)
Acquisition of real estate facilities	138,036		13,275
Consolidation of joint venture	106,717
Capital expenditures	38,904	51,909	37,232
Depreciation and amortization expense	(96,732)	(94,270)	(99,486)
Transfer to land and building held for development			(20,898)
Transfer to properties held for sale	(542)	2,299	2,065
Accumulated Depreciation, Ending Balances	(1,241,116)	(1,161,798)
Ending Balances	1,950,483	$ 1,764,100	1,804,162
Properties Held for Sale or Sold [Member]
Property, Plant and Equipment [Line Items]
Number of buildings reclassified to held for sale | property		7
Rentable square feet | ft²		194,000
Land [Member]
Property, Plant and Equipment [Line Items]
Beginning Balances	769,036	$ 769,036	773,074
Acquisition of real estate facilities	25,806		5,638
Consolidation of joint venture	21,814
Capital expenditures
Disposals
Depreciation and amortization expense
Transfer to land and building held for development			(9,676)
Transfer to properties held for sale
Ending Balances	816,656	769,036	769,036
Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Beginning Balances	2,156,862	2,119,212	2,109,097
Acquisition of real estate facilities	112,230		7,637
Consolidation of joint venture	84,903
Capital expenditures	38,904	51,909	37,232
Disposals	(17,345)	(13,919)	(14,411)
Transfer to land and building held for development			(19,092)
Transfer to properties held for sale	(611)	(340)	(1,251)
Ending Balances	2,374,943	2,156,862	2,119,212
Accumulated Depreciation [Member]
Property, Plant and Equipment [Line Items]
Accumulated Depreciation, Beginning Balances	(1,161,798)	(1,084,086)	(1,010,197)
Disposals	17,345	13,919	14,411
Depreciation and amortization expense	(96,732)	(94,270)	(99,486)
Transfer to land and building held for development			7,870
Transfer to properties held for sale	69	2,639	3,316
Accumulated Depreciation, Ending Balances	$ (1,241,116)	$ (1,161,798)	$ (1,084,086)

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, 2018	Dec. 31, 2016	Dec. 31, 2017
Real Estate Facilities [Abstract]
Land	$ 25,806	$ 5,638
Buildings and improvements	112,230	7,637
Other assets (above-market in-place rents)	1,487
Accrued and other liabilities (below-market in-place rents)	(1,790)	(25)
Other assets (in-place lease value)	6,033
Total purchase price	143,766	13,250	$ 0
Net operating assets acquired and liabilities assumed	(1,367)	(622)
Total cash paid	$ 142,399	$ 12,628

Real Estate Facilities (Summa_2

Real Estate Facilities (Summary Of Real Estate Assets Acquired And Liabilities Assumed - Joint Venture) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2016
Land	$ 25,806	$ 5,638
Buildings and improvements	112,230	$ 7,637
Other assets (in-place lease value)	6,033
Noncontrolling interest in consolidated joint venture	(4,032)
JV Partner [Member]
Land	21,814
Buildings and improvements	84,903
Other assets (in-place lease value)	1,199
Total consolidated joint venture	107,916
Noncontrolling interest in consolidated joint venture	(4,032)
Net book value of joint venture at consolidation	$ 103,884

Investment In And Advances To_2

Investment In And Advances To Unconsolidated Joint Venture (Narrative) (Details)	12 Months Ended
	Dec. 31, 2018USD ($)aft²itemproperty	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Schedule of Equity Method Investments [Line Items]
Number of units in multi-family asset | property	395
Investment in unconsolidated joint venture		$ 100,898,000
Capital contributions			$ 5,700,000
Total development costs	$ 107,000,000
Equity in loss of unconsolidated joint venture		(805,000)
Net income	$ 271,901,000	179,316,000	144,984,000
Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Net income		375,000
Depreciation expense		1,200,000
Investment in Unconsolidated Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Economic interest in joint venture, percentage	95.00%
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
Loan advances		34,100,000	33,900,000
Capitalized interest		$ 506,000	$ 885,000
Investment in 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]
Schedule of Equity Method Investments [Line Items]
Economic interest in joint venture, percentage	5.00%
The Mile [Member]
Schedule of Equity Method Investments [Line Items]
Square footage | ft²	628,000

Leasing Activity (Narrative) (D

Leasing Activity (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Leased Assets [Line Items]
Expense reimbursements	$ 91.2	$ 90.8	$ 82.6
Percentage of leased asset subjected to termination options	3.00%
Percentage of leased asset exercisable in period	1.30%
Termination option, exercisable through date	Dec. 31, 2019
Maximum [Member]
Operating Leased Assets [Line Items]
Non-cancelable lease term	10 years
Minimum [Member]
Operating Leased Assets [Line Items]
Non-cancelable lease term	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, 2018USD ($)
Leasing Activity [Abstract]
2,019	$ 289,220
2,020	223,015
2,021	164,039
2,022	111,253
2,023	73,019
Thereafter	112,059
Total	$ 972,605

Bank Loans (Details)

Bank Loans (Details) - Wells Fargo Credit Facility [Member] - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
loan origination fees	$ 613,000
Line of credit, expiration date		Jan. 10, 2022
Line of credit, borrowing limit		$ 250,000,000
Line of credit, frequency of interest payment		monthly
Spread over LIBOR		0.825%
Line of credit, percentage of commitment fees		0.125%
Line of credit, amount outstanding		$ 0	$ 0
Unamortized commitment fees		$ 691,000	$ 921,000
Maximum [Member]
Line of Credit Facility [Line Items]
Spread over LIBOR		1.55%
Line of credit, percentage of commitment fees		0.30%
Minimum [Member]
Line of Credit Facility [Line Items]
Spread over LIBOR		0.80%
Line of credit, percentage of commitment fees		0.10%

Mortgage Note Payable (Narrativ

Mortgage Note Payable (Narrative) (Details) - USD ($) $ in Thousands	Jun. 01, 2016	Dec. 31, 2018	Dec. 31, 2016
Debt Instrument [Line Items]
Mortgage note repayment amount	$ 250,000		$ 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)	12 Months Ended
	Dec. 31, 2018USD ($)propertyshares	Dec. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)shares	Jan. 01, 2018USD ($)
Noncontrolling Interests [Line Items]
Common units in operating partnership | shares	7,305,355	7,305,000	7,305,000
Noncontrolling interests	$ 218,091,000	$ 196,625,000
Number of units in multi-family asset | property	395
Number of common stock per unit of limited partnership interest redeemed | shares	1
Net income (loss) allocation to noncontrolling interests	$ 45,199,000	24,279,000	$ 16,955,000
Net income allocation to noncontrolling interests - common units	46,229,000	24,279,000	$ 16,955,000
PS [Member]
Noncontrolling Interests [Line Items]
Noncontrolling interests	215,100,000
JV Partner [Member]
Noncontrolling Interests [Line Items]
Noncontrolling interests	$ 3,000,000	$ 0		$ 4,000,000
Economic interest in joint venture, percentage	5.00%
Net income (loss) allocation to noncontrolling interests	$ (1,000,000)
Distributions paid	$ 0

Related Party Transactions (Nar

Related Party Transactions (Narrative) (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2018USD ($)item	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2018USD ($)item	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Related Party Transaction [Line Items]
Facility management fee	$ 104,125,000	$ 103,808,000	$ 101,824,000	$ 103,759,000	$ 101,837,000	$ 100,481,000	$ 99,800,000	$ 100,061,000	$ 413,516,000	$ 402,179,000	$ 386,871,000
Cost of operations	$ 30,637,000	$ 31,654,000	$ 31,256,000	$ 33,000,000	32,378,000	$ 31,679,000	$ 30,250,000	$ 31,033,000	$ 126,547,000	125,340,000	123,108,000
Royalty-free license agreement written notice of termination period minimum (in months)									6 months
Number of assets owned that are maintained by Public Storage | item	2								2
Property management contract written notice of termination period minimum (in days)									60 days
Management fee expenses									$ 96,000	92,000	86,000
Costs allocated from related party									65,000	61,000	61,000
Reimbursement to related party									1,200,000	1,300,000	1,100,000
Reimbursement from related party									38,000	31,000	38,000
Due from related parties	$ 43,000								43,000
Due to related parties					$ 245,000					245,000
Property Management [Member]
Related Party Transaction [Line Items]
Facility management fee									407,000	506,000	518,000
Operating expenses allocated to operating party									$ 472,000	$ 537,000	$ 554,000

Shareholders' Equity (Preferred

Shareholders' Equity (Preferred Stock) (Narrative) (Details)	Jan. 03, 2018USD ($)	Dec. 07, 2017USD ($)$ / sharesshares	Oct. 30, 2017USD ($)shares	Sep. 21, 2017USD ($)$ / sharesshares	Dec. 07, 2016	Oct. 20, 2016USD ($)$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2018USD ($)item$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)
Class of Stock [Line Items]
Shares Amount							$ 959,750,000	$ 959,750,000	$ 959,750,000
Preferred Redemption allocation									$ 10,978,000	$ 7,312,000
Preferred stock, shares issued | shares							38,390	38,390	38,390
Preferred stock, par value | $ / shares							$ 0.01	$ 0.01	$ 0.01
Net proceeds from the issuance of preferred stock									$ 415,779,000	183,316,000
Preferred stock, shares outstanding | shares							38,390	38,390	38,390
Distributions paid to preferred shareholders								$ 52,573,000	$ 52,180,000	57,276,000
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
Series T Preferred Stock [Member]
Class of Stock [Line Items]
Cumulative preferred stock, dividend rate	6.00%		6.00%
Shares Amount	$ 130,000,000		$ 220,000,000
Preferred Redemption allocation							$ 4,100,000		$ 6,900,000
Series T Preferred Stock [Member] | Depositary Share [Member]
Class of Stock [Line Items]
Redemption of preferred stock, shares | shares			8,800
Preferred stock, shares outstanding | shares			14,000
Series Y Preferred Stock [Member]
Class of Stock [Line Items]
Cumulative preferred stock, dividend rate		5.20%						5.20%
Shares Amount		$ 200,000,000						$ 200,000,000
Preferred stock, par value | $ / shares		$ 25
Non-callable period for Preferred Units		5 years
Net proceeds from the issuance of preferred stock		$ 193,600,000
Preferred stock, shares outstanding | shares								8,000
Series Y Preferred Stock [Member] | Depositary Share [Member]
Class of Stock [Line Items]
Preferred stock, shares issued | shares		8,000
Series X Preferred Stock [Member]
Class of Stock [Line Items]
Cumulative preferred stock, dividend rate				5.25%				5.25%
Shares Amount				$ 230,000,000				$ 230,000,000
Preferred stock, par value | $ / shares				$ 25
Non-callable period for Preferred Units				5 years
Net proceeds from the issuance of preferred stock				$ 222,200,000
Preferred stock, shares outstanding | shares								9,200
Series X Preferred Stock [Member] | Depositary Share [Member]
Class of Stock [Line Items]
Preferred stock, shares issued | shares				9,200
Series S Preferred Stock [Member]
Class of Stock [Line Items]
Cumulative preferred stock, dividend rate					6.45%
Preferred Redemption allocation										$ 7,300,000
Series W Preferred Stock [Member]
Class of Stock [Line Items]
Cumulative preferred stock, dividend rate						5.20%		5.20%
Shares Amount						$ 189,800,000		$ 189,750,000
Preferred stock, par value | $ / shares						$ 25
Non-callable period for Preferred Units						5 years
Net proceeds from the issuance of preferred stock						$ 183,300,000
Preferred stock, shares outstanding | shares								7,590
Series W Preferred Stock [Member] | Depositary Share [Member]
Class of Stock [Line Items]
Preferred stock, shares issued | shares						7,590

Shareholders' Equity (Common St

Shareholders' Equity (Common Stock And Units And Equity Stock) (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shareholders' Equity [Line Items]
Distributions paid to common shareholders							$ 103,837	$ 92,531	$ 81,285
Dividends paid per common share	$ 1.05	$ 0.85	$ 0.85	$ 0.75	$ 0.75	$ 0.60	$ 3.80	$ 3.40	$ 3
Distributions paid to noncontrolling interests — common units							$ 27,760	$ 24,838	$ 21,916
Percentage of distributions classified as ordinary income							99.30%	95.90%	100.00%
Percentage of distributions classified as long-term capital gain income							0.70%	4.10%	0.00%
Equity stock, shares authorized							100,000,000
Equity stock, shares issued							0	0
Common Units [Member]
Shareholders' Equity [Line Items]
Dividends paid per common share							$ 3.80	$ 3.40	$ 3

Shareholders' Equity (Schedule

Shareholders' Equity (Schedule Of Preferred Stock Outstanding) (Details) - USD ($) $ in Thousands	Dec. 07, 2017	Sep. 21, 2017	Oct. 20, 2016	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Shares Outstanding				38,390	38,390
Shares Amount				$ 959,750	$ 959,750
Series U Preferred Stock [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
Shares Amount				$ 230,000
Series V Preferred Stock [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
Shares Amount				$ 110,000
Series W Preferred Stock [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
Shares Amount			$ 189,800	$ 189,750
Series X Preferred Stock [Member]
Class of Stock [Line Items]
Issuance Date				Sep. 1, 2017
Earliest Potential Redemption Date				Sep. 1, 2022
Dividend Rate		5.25%		5.25%
Shares Outstanding				9,200
Shares Amount		$ 230,000		$ 230,000
Series Y Preferred Stock [Member]
Class of Stock [Line Items]
Issuance Date				Dec. 1, 2017
Earliest Potential Redemption Date				Dec. 1, 2022
Dividend Rate	5.20%			5.20%
Shares Outstanding				8,000
Shares Amount	$ 200,000			$ 200,000

Stock Compensation (Narrative)

Stock Compensation (Narrative) (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2018shares	Sep. 30, 2016USD ($)	Dec. 31, 2018USD ($)itemshares	Dec. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative effect of a change in accounting principle		$ 807,000
Proceeds from the exercise of stock options			$ 3,010,000	$ 4,218,000	$ 3,888,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period			10 years
Unamortized compensation expense			$ 604,000
Weighted average recognized period of unamortized compensation expenses (in years)			3 years 3 months 18 days
Options exercised | shares			44,994	73,246	68,019
Restricted Stock Units (RSUs) Granted Prior To 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			6 years
Restricted Stock Units (RSUs) Granted Prior To 2016 [Member] | Year One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			0.00%
Restricted Stock Units (RSUs) Granted Prior To 2016 [Member] | Year Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			20.00%
Restricted Stock Units (RSUs) Granted Prior To 2016 [Member] | Year Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			20.00%
Restricted Stock Units (RSUs) Granted Prior To 2016 [Member] | Year Four [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			20.00%
Restricted Stock Units (RSUs) Granted Prior To 2016 [Member] | Year Five [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			20.00%
Restricted Stock Units (RSUs) Granted Prior To 2016 [Member] | Year Six [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			20.00%
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized compensation expense			$ 9,300,000
Weighted average recognized period of unamortized compensation expenses (in years)			3 years 7 months 6 days
Vesting period			5 years
Stock units granted | shares			194,450	113,750	119,950
Restricted Stock Units (RSUs) [Member] | Year One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			20.00%
Restricted Stock Units (RSUs) [Member] | Year Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			20.00%
Restricted Stock Units (RSUs) [Member] | Year Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			20.00%
Restricted Stock Units (RSUs) [Member] | Year Four [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			20.00%
Restricted Stock Units (RSUs) [Member] | Year Five [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			20.00%
2014 Performance-Based Restricted Stock Unit Program [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units granted | shares	145,350
Number of defined targets to achieve for restricted stock unit awards | item			3
Number of defined targets to achieve for restricted stock unit awards | item			1
Length of Restricted Stock Unit program (in years)			4 years
Number of annual vesting installments | item			4

Stock Compensation (Schedule of

Stock Compensation (Schedule of Valuation Assumptions) (Details) - Stock Options [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock option expense for the year ( in 000's)	$ 236	$ 209	$ 282
Aggregate exercise date intrinsic value of options exercised during the year ( in 000's)	$ 2,752	$ 5,177	$ 3,416
Expected life of options in years, based upon historical experience	5 years	5 years	5 years
Risk-free interest rate	2.80%	1.90%	1.10%
Expected volatility, based upon historical volatility	20.80%	17.50%	15.50%
Expected dividend yield	2.90%	2.80%	2.90%
Average estimated value of options granted during the year	$ 18.11	$ 14.42	$ 9.05

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Outstanding Beginning Balance	172,409	229,655	258,674
Number of Options, Granted	16,000	16,000	39,000
Number of Options, Exercised	(44,994)	(73,246)	(68,019)
Number of Options, Forfeited
Number of Options, Outstanding Ending Balance	143,415	172,409	229,655
Number of Options, Exercisable at December 31,	82,815
Weighted Average Exercise Price, Outstanding Beginning Balance	$ 78.63	$ 68.93	$ 60.76
Weighted Average Exercise Price, Granted	115.45	121.57	102.58
Weighted Average Exercise Price, Exercised	66.88	57.59	57.17
Weighted Average Exercise Price, Forfeited
Weighted Average Exercise Price, Outstanding Ending Balance	86.42	$ 78.63	$ 68.93
Weighted Average Exercise Price, Exercisable at December 31,	$ 71.36
Weighted Average Remaining Contract Life, Outstanding at December 31,	5 years 7 months 17 days
Weighted Average Remaining Contract Life, Exercisable at December 31,	3 years 11 months 12 days
Aggregate Intrinsic Value, Outstanding at December 31,	$ 6,393
Aggregate Intrinsic Value, Exercisable at December 31,	$ 4,939

Stock Compensation (Nonvested R

Stock Compensation (Nonvested Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Units, Nonvested Beginning Balance	165,083	144,693	78,652
Number of Units, Granted	194,450	113,750	119,950
Number of Units, Vested	(106,103)	(76,994)	(47,779)
Number of Units, Forfeited	(10,140)	(16,366)	(6,130)
Number of Units, Nonvested Ending Balance	243,290	165,083	144,693
Weighted Average Grant Date Fair Value, Nonvested Beginning Balance	$ 15,116	$ 12,346	$ 6,170
Weighted Average Grant Date Fair Value, Granted	18,431	10,748	10,489
Weighted Average Grant Date Fair Value, Vested	(9,256)	(6,597)	(3,844)
Weighted Average Grant Date Fair Value, Forfeited	(905)	(1,381)	(469)
Weighted Average Grant Date Fair Value, Nonvested Ending Balance	$ 23,386	$ 15,116	$ 12,346

Stock Compensation (Schedule _2

Stock Compensation (Schedule of Restricted Stock Unit Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares issued upon vesting	27,362,101	27,254,607
Cash paid for taxes in lieu of shares upon vesting of RSU's	$ 4,981	$ 3,865	$ 1,940
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share unit expense	$ 3,727	$ 4,279	$ 10,290
Common shares issued upon vesting	62,500	43,223	28,046
Fair value of vested shares on vesting date	$ 12,127	$ 8,816	$ 4,699

Supplementary Quarterly Finan_3

Supplementary Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplementary Quarterly Financial Data [Abstract]
Rental income	$ 104,125	$ 103,808	$ 101,824	$ 103,759	$ 101,837	$ 100,481	$ 99,800	$ 100,061	$ 413,516	$ 402,179	$ 386,871
Cost of operations	30,637	31,654	31,256	33,000	32,378	31,679	30,250	31,033	126,547	125,340	123,108
Net income allocable to common shareholders	$ 31,499	$ 25,131	$ 70,221	$ 46,048	$ 21,150	$ 18,138	$ 24,742	$ 26,392	$ 172,899	$ 90,425	$ 62,872
Net income per share: Basic	$ 1.15	$ 0.92	$ 2.57	$ 1.69	$ 0.78	$ 0.67	$ 0.91	$ 0.97	$ 6.33	$ 3.32	$ 2.32
Net income per share: Diluted	$ 1.15	$ 0.92	$ 2.56	$ 1.69	$ 0.77	$ 0.66	$ 0.90	$ 0.97	$ 6.31	$ 3.30	$ 2.31

Schedule III - Real Estate An_2

Schedule III - Real Estate And Accumulated Depreciation (Real Estate And Accumulated Depreciation) (Details) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)ft²property	Nov. 01, 2016ft²
Real Estate and Accumulated Depreciation [Line Items]
Square Feet | ft²	28,186
Number of units of Real Estate Property | property	395
Initial Cost to Company, Land	$ 816,656
Initial Cost to Company, Buildings and Improvements	1,840,338
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements	534,605
Gross Amount at Which Carried at December 31, 2018, Land	816,656
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	2,374,943
Gross Amount at Which Carried at December 31, 2018, Total	3,191,599
Accumulated Depreciation	$ 1,241,116
Commercial Real Estate [Member]
Real Estate and Accumulated Depreciation [Line Items]
Square Feet | ft²	28,186
Initial Cost to Company, Land	$ 794,842
Initial Cost to Company, Buildings and Improvements	1,755,422
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements	534,605
Gross Amount at Which Carried at December 31, 2018, Land	794,842
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	2,290,027
Gross Amount at Which Carried at December 31, 2018, Total	3,084,869
Accumulated Depreciation	1,238,467
Multifamily [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial Cost to Company, Land	21,814
Initial Cost to Company, Buildings and Improvements	84,916
Gross Amount at Which Carried at December 31, 2018, Land	21,814
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	84,916
Gross Amount at Which Carried at December 31, 2018, Total	106,730
Accumulated Depreciation	$ 2,649
Buena Park Industrial Center [Member] | Commercial Real Estate [Member] | Buena Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	2,728
Gross Amount at Which Carried at December 31, 2018, Land	3,245
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	10,431
Gross Amount at Which Carried at December 31, 2018, Total	13,676
Accumulated Depreciation	$ 7,805
Year(s) Acquired	1,997
Carson [Member] | Commercial Real Estate [Member] | Carson, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	1,543
Gross Amount at Which Carried at December 31, 2018, Land	990
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	4,039
Gross Amount at Which Carried at December 31, 2018, Total	5,029
Accumulated Depreciation	$ 3,123
Year(s) Acquired	1,997
Cerritos Business Center [Member] | Commercial Real Estate [Member] | Cerritos, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	4,466
Gross Amount at Which Carried at December 31, 2018, Land	4,218
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	14,739
Gross Amount at Which Carried at December 31, 2018, Total	18,957
Accumulated Depreciation	$ 10,948
Year(s) Acquired	1,997
Cerritos/Edwards [Member] | Commercial Real Estate [Member] | Cerritos, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	1,535
Gross Amount at Which Carried at December 31, 2018, Land	450
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	2,752
Gross Amount at Which Carried at December 31, 2018, Total	3,202
Accumulated Depreciation	$ 2,012
Year(s) Acquired	1,997
Concord Business Park [Member] | Commercial Real Estate [Member] | Concord, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	1,102
Gross Amount at Which Carried at December 31, 2018, Land	12,454
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	21,593
Gross Amount at Which Carried at December 31, 2018, Total	34,047
Accumulated Depreciation	$ 6,583
Year(s) Acquired	2,011
Culver City [Member] | Commercial Real Estate [Member] | Culver City, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	6,229
Gross Amount at Which Carried at December 31, 2018, Land	3,252
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	14,386
Gross Amount at Which Carried at December 31, 2018, Total	17,638
Accumulated Depreciation	$ 11,096
Year(s) Acquired	1,997
Bayview Business Park [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	304
Gross Amount at Which Carried at December 31, 2018, Land	4,990
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	5,135
Gross Amount at Which Carried at December 31, 2018, Total	10,125
Accumulated Depreciation	$ 1,848
Year(s) Acquired	2,011
Christy Business Park [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	1,778
Gross Amount at Which Carried at December 31, 2018, Land	11,451
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	18,032
Gross Amount at Which Carried at December 31, 2018, Total	29,483
Accumulated Depreciation	$ 6,467
Year(s) Acquired	2,011
Industrial Drive Distribution Center [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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, 2018, Land	7,482
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	7,610
Gross Amount at Which Carried at December 31, 2018, Total	15,092
Accumulated Depreciation	$ 2,550
Year(s) Acquired	2,011
Bay Center Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	3,991
Gross Amount at Which Carried at December 31, 2018, Land	19,052
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	54,492
Gross Amount at Which Carried at December 31, 2018, Total	73,544
Accumulated Depreciation	$ 17,064
Year(s) Acquired	2,011
Cabot Distribution Center [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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, 2018, Land	5,859
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	11,185
Gross Amount at Which Carried at December 31, 2018, Total	17,044
Accumulated Depreciation	$ 3,265
Year(s) Acquired	2,011
Diablo Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	914
Gross Amount at Which Carried at December 31, 2018, Land	9,102
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	16,635
Gross Amount at Which Carried at December 31, 2018, Total	25,737
Accumulated Depreciation	$ 5,125
Year(s) Acquired	2,011
Eden Landing [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	162
Gross Amount at Which Carried at December 31, 2018, Land	3,275
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	6,336
Gross Amount at Which Carried at December 31, 2018, Total	9,611
Accumulated Depreciation	$ 1,992
Year(s) Acquired	2,011
Hayward Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	2,866
Gross Amount at Which Carried at December 31, 2018, Land	28,256
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	57,284
Gross Amount at Which Carried at December 31, 2018, Total	85,540
Accumulated Depreciation	$ 17,336
Year(s) Acquired	2,011
Huntwood Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	745
Gross Amount at Which Carried at December 31, 2018, Land	7,391
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	12,564
Gross Amount at Which Carried at December 31, 2018, Total	19,955
Accumulated Depreciation	$ 3,924
Year(s) Acquired	2,011
Parkway Commerce [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	4,573
Gross Amount at Which Carried at December 31, 2018, Land	4,398
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	15,006
Gross Amount at Which Carried at December 31, 2018, Total	19,404
Accumulated Depreciation	$ 10,857
Year(s) Acquired	1,997
Laguna Hills Commerce Center [Member] | Commercial Real Estate [Member] | Laguna Hills, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	7,985
Gross Amount at Which Carried at December 31, 2018, Land	16,261
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	47,544
Gross Amount at Which Carried at December 31, 2018, Total	63,805
Accumulated Depreciation	$ 34,283
Year(s) Acquired	1,997
Plaza Del Lago [Member] | Commercial Real Estate [Member] | Laguna Hills, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	4,099
Gross Amount at Which Carried at December 31, 2018, Land	2,037
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	9,150
Gross Amount at Which Carried at December 31, 2018, Total	11,187
Accumulated Depreciation	$ 7,049
Year(s) Acquired	1,997
Canada Business Center [Member] | Commercial Real Estate [Member] | Lake Forest, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	6,350
Gross Amount at Which Carried at December 31, 2018, Land	5,508
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	20,135
Gross Amount at Which Carried at December 31, 2018, Total	25,643
Accumulated Depreciation	$ 14,943
Year(s) Acquired	1,997
Dixon Landing Business Park [Member] | Commercial Real Estate [Member] | Milpitas, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	3,936
Gross Amount at Which Carried at December 31, 2018, Land	26,301
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	25,057
Gross Amount at Which Carried at December 31, 2018, Total	51,358
Accumulated Depreciation	$ 9,193
Year(s) Acquired	2,011
Monterey/Calle [Member] | Commercial Real Estate [Member] | Monterey, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	392
Gross Amount at Which Carried at December 31, 2018, Land	288
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	1,098
Gross Amount at Which Carried at December 31, 2018, Total	1,386
Accumulated Depreciation	$ 798
Year(s) Acquired	1,997
Monterey Park [Member] | Commercial Real Estate [Member] | Monterey Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	1,761
Gross Amount at Which Carried at December 31, 2018, Land	3,078
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	9,623
Gross Amount at Which Carried at December 31, 2018, Total	12,701
Accumulated Depreciation	$ 7,205
Year(s) Acquired	1,997
Port Of Oakland [Member] | Commercial Real Estate [Member] | Oakland, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	820
Gross Amount at Which Carried at December 31, 2018, Land	5,638
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	11,886
Gross Amount at Which Carried at December 31, 2018, Total	17,524
Accumulated Depreciation	$ 3,669
Year(s) Acquired	2,011
Kearney Mesa [Member] | Commercial Real Estate [Member] | San Diego, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	2,935
Gross Amount at Which Carried at December 31, 2018, Land	2,894
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	10,024
Gross Amount at Which Carried at December 31, 2018, Total	12,918
Accumulated Depreciation	$ 7,413
Year(s) Acquired	1,997
Lusk [Member] | Commercial Real Estate [Member] | San Diego, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	5,958
Gross Amount at Which Carried at December 31, 2018, Land	5,711
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	20,007
Gross Amount at Which Carried at December 31, 2018, Total	25,718
Accumulated Depreciation	$ 14,963
Year(s) Acquired	1,997
Rose Canyon Business Park [Member] | Commercial Real Estate [Member] | San Diego, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	2,491
Gross Amount at Which Carried at December 31, 2018, Land	15,129
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	22,545
Gross Amount at Which Carried at December 31, 2018, Total	37,674
Accumulated Depreciation	$ 13,404
Year(s) Acquired	2,005
Charcot Business Park [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	1,853
Gross Amount at Which Carried at December 31, 2018, Land	18,654
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	19,433
Gross Amount at Which Carried at December 31, 2018, Total	38,087
Accumulated Depreciation	$ 6,913
Year(s) Acquired	2011/2014
Las Plumas [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	6,776
Gross Amount at Which Carried at December 31, 2018, Land	4,379
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	19,665
Gross Amount at Which Carried at December 31, 2018, Total	24,044
Accumulated Depreciation	$ 15,833
Year(s) Acquired	1,998
Little Orchard Distribution Center [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	718
Gross Amount at Which Carried at December 31, 2018, Land	7,725
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	4,564
Gross Amount at Which Carried at December 31, 2018, Total	12,289
Accumulated Depreciation	$ 1,971
Year(s) Acquired	2,011
Montague Industrial Park [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	518
Gross Amount at Which Carried at December 31, 2018, Land	14,476
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	13,325
Gross Amount at Which Carried at December 31, 2018, Total	27,801
Accumulated Depreciation	$ 5,172
Year(s) Acquired	2,011
Oakland Road [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	3,291
Gross Amount at Which Carried at December 31, 2018, Land	3,458
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	12,056
Gross Amount at Which Carried at December 31, 2018, Total	15,514
Accumulated Depreciation	$ 8,977
Year(s) Acquired	1,997
Rogers Ave [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	576
Gross Amount at Which Carried at December 31, 2018, Land	3,540
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	5,472
Gross Amount at Which Carried at December 31, 2018, Total	9,012
Accumulated Depreciation	$ 2,989
Year(s) Acquired	2,006
Doolittle Business Park [Member] | Commercial Real Estate [Member] | San Leandro, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	480
Gross Amount at Which Carried at December 31, 2018, Land	3,929
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	6,711
Gross Amount at Which Carried at December 31, 2018, Total	10,640
Accumulated Depreciation	$ 2,183
Year(s) Acquired	2,011
Bayshore Corporate Center [Member] | Commercial Real Estate [Member] | San Mateo, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	6,964
Gross Amount at Which Carried at December 31, 2018, Land	25,108
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	43,855
Gross Amount at Which Carried at December 31, 2018, Total	68,963
Accumulated Depreciation	$ 13,870
Year(s) Acquired	2,013
San Ramon/Norris Canyon [Member] | Commercial Real Estate [Member] | San Ramon, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	1,340
Gross Amount at Which Carried at December 31, 2018, Land	1,486
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	4,982
Gross Amount at Which Carried at December 31, 2018, Total	6,468
Accumulated Depreciation	$ 3,718
Year(s) Acquired	1,997
Commerce Park [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	4,111
Gross Amount at Which Carried at December 31, 2018, Land	17,218
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	26,025
Gross Amount at Which Carried at December 31, 2018, Total	43,243
Accumulated Depreciation	$ 17,177
Year(s) Acquired	2,007
Santa Clara Tech Park [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	4,575
Gross Amount at Which Carried at December 31, 2018, Land	7,673
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	20,220
Gross Amount at Which Carried at December 31, 2018, Total	27,893
Accumulated Depreciation	$ 14,847
Year(s) Acquired	2,000
Walsh At Lafayette [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	636
Gross Amount at Which Carried at December 31, 2018, Land	13,439
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	18,526
Gross Amount at Which Carried at December 31, 2018, Total	31,965
Accumulated Depreciation	$ 6,584
Year(s) Acquired	2,011
Signal Hill [Member] | Commercial Real Estate [Member] | Signal Hill, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	3,059
Gross Amount at Which Carried at December 31, 2018, Land	6,693
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	15,758
Gross Amount at Which Carried at December 31, 2018, Total	22,451
Accumulated Depreciation	$ 10,178
Year(s) Acquired	1997/2006
Airport Boulevard [Member] | Commercial Real Estate [Member] | So San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	812
Gross Amount at Which Carried at December 31, 2018, Land	899
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	3,199
Gross Amount at Which Carried at December 31, 2018, Total	4,098
Accumulated Depreciation	$ 2,390
Year(s) Acquired	1,997
South San Francisco/Produce [Member] | Commercial Real Estate [Member] | So San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	546
Gross Amount at Which Carried at December 31, 2018, Land	776
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	2,432
Gross Amount at Which Carried at December 31, 2018, Total	3,208
Accumulated Depreciation	$ 1,804
Year(s) Acquired	1,997
Studio City/Ventura [Member] | Commercial Real Estate [Member] | Studio City, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	552
Gross Amount at Which Carried at December 31, 2018, Land	621
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	2,082
Gross Amount at Which Carried at December 31, 2018, Total	2,703
Accumulated Depreciation	$ 1,568
Year(s) Acquired	1,997
Kifer Industrial Park [Member] | Commercial Real Estate [Member] | Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	1,488
Gross Amount at Which Carried at December 31, 2018, Land	13,227
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	39,362
Gross Amount at Which Carried at December 31, 2018, Total	52,589
Accumulated Depreciation	$ 11,696
Year(s) Acquired	2,011
Torrance [Member] | Commercial Real Estate [Member] | Torrance, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	3,564
Gross Amount at Which Carried at December 31, 2018, Land	2,318
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	9,633
Gross Amount at Which Carried at December 31, 2018, Total	11,951
Accumulated Depreciation	$ 7,287
Year(s) Acquired	1,997
Boca Commerce [Member] | Commercial Real Estate [Member] | Boca Raton, FL [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	3,307
Gross Amount at Which Carried at December 31, 2018, Land	7,795
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	12,565
Gross Amount at Which Carried at December 31, 2018, Total	20,360
Accumulated Depreciation	$ 6,142
Year(s) Acquired	2,006
MICC [Member] | Commercial Real Estate [Member] | Miami, FL [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	42,247
Gross Amount at Which Carried at December 31, 2018, Land	95,115
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	154,830
Gross Amount at Which Carried at December 31, 2018, Total	249,945
Accumulated Depreciation	$ 96,725
Year(s) Acquired	2003/2011/2014
Wellington [Member] | Commercial Real Estate [Member] | Wellington, FL [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	2,583
Gross Amount at Which Carried at December 31, 2018, Land	10,845
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	21,143
Gross Amount at Which Carried at December 31, 2018, Total	31,988
Accumulated Depreciation	$ 10,191
Year(s) Acquired	2,006
Ammendale [Member] | Commercial Real Estate [Member] | Beltsville, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	11,434
Gross Amount at Which Carried at December 31, 2018, Land	4,278
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	29,814
Gross Amount at Which Carried at December 31, 2018, Total	34,092
Accumulated Depreciation	$ 23,826
Year(s) Acquired	1,998
Gaithersburgh/Christopher [Member] | Commercial Real Estate [Member] | Gaithersburg, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	724
Gross Amount at Which Carried at December 31, 2018, Land	475
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	1,927
Gross Amount at Which Carried at December 31, 2018, Total	2,402
Accumulated Depreciation	$ 1,461
Year(s) Acquired	1,997
Metro Park North [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	47,901
Gross Amount at Which Carried at December 31, 2018, Land	33,995
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	142,364
Gross Amount at Which Carried at December 31, 2018, Total	176,359
Accumulated Depreciation	$ 94,491
Year(s) Acquired	2,001
Parklawn Business Park [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	4,871
Gross Amount at Which Carried at December 31, 2018, Land	3,387
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	24,499
Gross Amount at Which Carried at December 31, 2018, Total	27,886
Accumulated Depreciation	$ 10,572
Year(s) Acquired	2,010
The Grove 270 [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Square Feet | ft²	578
Initial Cost to Company, Land	$ 11,010
Initial Cost to Company, Buildings and Improvements	58,364
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements	21,236
Gross Amount at Which Carried at December 31, 2018, Land	11,010
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	79,600
Gross Amount at Which Carried at December 31, 2018, Total	90,610
Accumulated Depreciation	$ 26,932
Year(s) Acquired	2010/2016
Westech Business Park [Member] | Commercial Real Estate [Member] | Silver Spring, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	19,680
Gross Amount at Which Carried at December 31, 2018, Land	25,261
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	94,252
Gross Amount at Which Carried at December 31, 2018, Total	119,513
Accumulated Depreciation	$ 59,715
Year(s) Acquired	2,006
Ben White [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	1,415
Gross Amount at Which Carried at December 31, 2018, Land	1,550
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	8,430
Gross Amount at Which Carried at December 31, 2018, Total	9,980
Accumulated Depreciation	$ 6,134
Year(s) Acquired	1,998
Lamar Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	6,620
Gross Amount at Which Carried at December 31, 2018, Land	2,528
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	13,216
Gross Amount at Which Carried at December 31, 2018, Total	15,744
Accumulated Depreciation	$ 10,259
Year(s) Acquired	1,997
McKalla [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	2,388
Gross Amount at Which Carried at December 31, 2018, Land	1,945
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	15,600
Gross Amount at Which Carried at December 31, 2018, Total	17,545
Accumulated Depreciation	$ 8,499
Year(s) Acquired	1998/2012
McNeil [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	5,014
Gross Amount at Which Carried at December 31, 2018, Land	5,477
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	29,509
Gross Amount at Which Carried at December 31, 2018, Total	34,986
Accumulated Depreciation	$ 12,821
Year(s) Acquired	1999/2010/2012/2014
Rutland [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	2,033
Gross Amount at Which Carried at December 31, 2018, Land	2,022
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	11,430
Gross Amount at Which Carried at December 31, 2018, Total	13,452
Accumulated Depreciation	$ 8,515
Year(s) Acquired	1998/1999
Waterford [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	3,929
Gross Amount at Which Carried at December 31, 2018, Land	2,108
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	13,578
Gross Amount at Which Carried at December 31, 2018, Total	15,686
Accumulated Depreciation	$ 10,058
Year(s) Acquired	1,999
Braker Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	2,522
Gross Amount at Which Carried at December 31, 2018, Land	1,874
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	16,512
Gross Amount at Which Carried at December 31, 2018, Total	18,386
Accumulated Depreciation	$ 7,539
Year(s) Acquired	2,010
Mopac Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	660
Gross Amount at Which Carried at December 31, 2018, Land	719
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	4,239
Gross Amount at Which Carried at December 31, 2018, Total	4,958
Accumulated Depreciation	$ 1,888
Year(s) Acquired	2,010
Southpark Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	2,631
Gross Amount at Which Carried at December 31, 2018, Land	1,266
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	12,513
Gross Amount at Which Carried at December 31, 2018, Total	13,779
Accumulated Depreciation	$ 5,934
Year(s) Acquired	2,010
Valwood Business Center [Member] | Commercial Real Estate [Member] | Carrolton, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	2,936
Gross Amount at Which Carried at December 31, 2018, Land	2,510
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	16,795
Gross Amount at Which Carried at December 31, 2018, Total	19,305
Accumulated Depreciation	$ 5,721
Year(s) Acquired	2,013
Northway Plaza [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	1,287
Gross Amount at Which Carried at December 31, 2018, Land	1,742
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	5,790
Gross Amount at Which Carried at December 31, 2018, Total	7,532
Accumulated Depreciation	$ 1,939
Year(s) Acquired	2,013
Springlake Business Center [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	2,052
Gross Amount at Which Carried at December 31, 2018, Land	2,607
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	7,767
Gross Amount at Which Carried at December 31, 2018, Total	10,374
Accumulated Depreciation	$ 3,030
Year(s) Acquired	2013/2014
Westwood Business Park [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	2,431
Gross Amount at Which Carried at December 31, 2018, Land	941
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	9,315
Gross Amount at Which Carried at December 31, 2018, Total	10,256
Accumulated Depreciation	$ 5,950
Year(s) Acquired	2,003
Eastgate [Member] | Commercial Real Estate [Member] | Garland, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	448
Gross Amount at Which Carried at December 31, 2018, Land	480
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	1,651
Gross Amount at Which Carried at December 31, 2018, Total	2,131
Accumulated Depreciation	$ 1,282
Year(s) Acquired	1,997
Freeport Business Park [Member] | Commercial Real Estate [Member] | Irving, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	3,107
Gross Amount at Which Carried at December 31, 2018, Land	4,564
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	12,613
Gross Amount at Which Carried at December 31, 2018, Total	17,177
Accumulated Depreciation	$ 4,471
Year(s) Acquired	2,013
NFTZ [Member] | Commercial Real Estate [Member] | Irving, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Square Feet | ft²	231
Initial Cost to Company, Land	$ 1,517
Initial Cost to Company, Buildings and Improvements	6,499
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements	3,527
Gross Amount at Which Carried at December 31, 2018, Land	1,517
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	10,026
Gross Amount at Which Carried at December 31, 2018, Total	11,543
Accumulated Depreciation	$ 7,972
Year(s) Acquired	1,998
NFTZ [Member] | Commercial Real Estate [Member] | Las Colinas, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Number of properties subject to ground leases | property	2
Royal Tech [Member] | Commercial Real Estate [Member] | Irving, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	25,400
Gross Amount at Which Carried at December 31, 2018, Land	13,989
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	79,513
Gross Amount at Which Carried at December 31, 2018, Total	93,502
Accumulated Depreciation	$ 55,389
Year(s) Acquired	1998-2000/2011
La Prada [Member] | Commercial Real Estate [Member] | Mesquite, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	742
Gross Amount at Which Carried at December 31, 2018, Land	495
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	1,977
Gross Amount at Which Carried at December 31, 2018, Total	2,472
Accumulated Depreciation	$ 1,466
Year(s) Acquired	1,997
The Summit [Member] | Commercial Real Estate [Member] | Plano, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	4,596
Gross Amount at Which Carried at December 31, 2018, Land	1,536
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	11,250
Gross Amount at Which Carried at December 31, 2018, Total	12,786
Accumulated Depreciation	$ 8,948
Year(s) Acquired	1,998
Arapaho Business Park [Member] | Commercial Real Estate [Member] | Richardson, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	4,514
Gross Amount at Which Carried at December 31, 2018, Land	5,226
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	15,175
Gross Amount at Which Carried at December 31, 2018, Total	20,401
Accumulated Depreciation	$ 6,046
Year(s) Acquired	2013/2014
Richardson Business Park [Member] | Commercial Real Estate [Member] | Richardson, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	2,987
Gross Amount at Which Carried at December 31, 2018, Land	799
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	6,555
Gross Amount at Which Carried at December 31, 2018, Total	7,354
Accumulated Depreciation	$ 5,263
Year(s) Acquired	1,998
Bren Mar [Member] | Commercial Real Estate [Member] | Alexandria, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	3,905
Gross Amount at Which Carried at December 31, 2018, Land	2,197
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	9,285
Gross Amount at Which Carried at December 31, 2018, Total	11,482
Accumulated Depreciation	$ 7,255
Year(s) Acquired	1,997
Eisenhower [Member] | Commercial Real Estate [Member] | Alexandria, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	2,666
Gross Amount at Which Carried at December 31, 2018, Land	1,440
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	6,301
Gross Amount at Which Carried at December 31, 2018, Total	7,741
Accumulated Depreciation	$ 4,997
Year(s) Acquired	1,997
Beaumont [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	2,250
Gross Amount at Which Carried at December 31, 2018, Land	4,736
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	13,301
Gross Amount at Which Carried at December 31, 2018, Total	18,037
Accumulated Depreciation	$ 8,287
Year(s) Acquired	2,006
Dulles South [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	3,206
Gross Amount at Which Carried at December 31, 2018, Land	1,373
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	10,016
Gross Amount at Which Carried at December 31, 2018, Total	11,389
Accumulated Depreciation	$ 7,494
Year(s) Acquired	1,999
Lafayette [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	6,532
Gross Amount at Which Carried at December 31, 2018, Land	1,680
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	19,930
Gross Amount at Which Carried at December 31, 2018, Total	21,610
Accumulated Depreciation	$ 13,959
Year(s) Acquired	1999/2000
Park East [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	10,723
Gross Amount at Which Carried at December 31, 2018, Land	3,851
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	28,752
Gross Amount at Which Carried at December 31, 2018, Total	32,603
Accumulated Depreciation	$ 21,427
Year(s) Acquired	1,999
Fair Oaks Business Park [Member] | Commercial Real Estate [Member] | Fairfax, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	9,609
Gross Amount at Which Carried at December 31, 2018, Land	13,598
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	45,841
Gross Amount at Which Carried at December 31, 2018, Total	59,439
Accumulated Depreciation	$ 27,723
Year(s) Acquired	2004/2007
Monroe [Member] | Commercial Real Estate [Member] | Herndon, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	11,846
Gross Amount at Which Carried at December 31, 2018, Land	6,737
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	30,757
Gross Amount at Which Carried at December 31, 2018, Total	37,494
Accumulated Depreciation	$ 22,963
Year(s) Acquired	1997/1999
Gunston [Member] | Commercial Real Estate [Member] | Lorton, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	11,997
Gross Amount at Which Carried at December 31, 2018, Land	4,146
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	29,869
Gross Amount at Which Carried at December 31, 2018, Total	34,015
Accumulated Depreciation	$ 19,408
Year(s) Acquired	1,998
The Mile [Member]
Real Estate and Accumulated Depreciation [Line Items]
Square Feet | ft²		123
The Mile [Member] | Commercial Real Estate [Member] | McLean, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	25,093
Gross Amount at Which Carried at December 31, 2018, Land	38,279
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	108,689
Gross Amount at Which Carried at December 31, 2018, Total	146,968
Accumulated Depreciation	$ 48,201
Year(s) Acquired	2010/2011
Prosperity at Merrifield [Member] | Commercial Real Estate [Member] | Merrifield, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	36,497
Gross Amount at Which Carried at December 31, 2018, Land	23,147
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	104,072
Gross Amount at Which Carried at December 31, 2018, Total	127,219
Accumulated Depreciation	$ 69,488
Year(s) Acquired	2,001
Alban Road [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	4,936
Gross Amount at Which Carried at December 31, 2018, Land	1,935
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	9,672
Gross Amount at Which Carried at December 31, 2018, Total	11,607
Accumulated Depreciation	$ 7,811
Year(s) Acquired	1,997
I-95 [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	14,038
Gross Amount at Which Carried at December 31, 2018, Land	3,535
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	29,710
Gross Amount at Which Carried at December 31, 2018, Total	33,245
Accumulated Depreciation	$ 22,164
Year(s) Acquired	2,000
Fullterton Road Industrial Park [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Square Feet | ft²	243
Initial Cost to Company, Land	$ 7,438
Initial Cost to Company, Buildings and Improvements	24,971
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements	175
Gross Amount at Which Carried at December 31, 2018, Land	7,438
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	25,146
Gross Amount at Which Carried at December 31, 2018, Total	32,584
Accumulated Depreciation	$ 638
Year(s) Acquired	2,018
Northern Virginia Industrial Park [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Square Feet | ft²	814
Initial Cost to Company, Land	$ 18,369
Initial Cost to Company, Buildings and Improvements	87,258
Cost Capitalized Subsequent to Acquisition, Buildings and Improvements	1,472
Gross Amount at Which Carried at December 31, 2018, Land	18,369
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	88,730
Gross Amount at Which Carried at December 31, 2018, Total	107,099
Accumulated Depreciation	$ 2,110
Year(s) Acquired	2,018
Northpointe [Member] | Commercial Real Estate [Member] | Sterling, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	4,744
Gross Amount at Which Carried at December 31, 2018, Land	2,767
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	13,522
Gross Amount at Which Carried at December 31, 2018, Total	16,289
Accumulated Depreciation	$ 10,741
Year(s) Acquired	1997/1998
Shaw Road [Member] | Commercial Real Estate [Member] | Sterling, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	4,766
Gross Amount at Which Carried at December 31, 2018, Land	2,969
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	14,774
Gross Amount at Which Carried at December 31, 2018, Total	17,743
Accumulated Depreciation	$ 11,709
Year(s) Acquired	1,998
Tysons Corporate Center [Member] | Commercial Real Estate [Member] | Vienna, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	9,917
Gross Amount at Which Carried at December 31, 2018, Land	9,885
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	35,219
Gross Amount at Which Carried at December 31, 2018, Total	45,104
Accumulated Depreciation	$ 15,270
Year(s) Acquired	2,010
Woodbridge [Member] | Commercial Real Estate [Member] | Woodbridge, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	2,043
Gross Amount at Which Carried at December 31, 2018, Land	1,350
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	5,441
Gross Amount at Which Carried at December 31, 2018, Total	6,791
Accumulated Depreciation	$ 4,233
Year(s) Acquired	1,997
212th Business Park [Member] | Commercial Real Estate [Member] | Kent, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	12,296
Gross Amount at Which Carried at December 31, 2018, Land	19,573
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	29,991
Gross Amount at Which Carried at December 31, 2018, Total	49,564
Accumulated Depreciation	$ 11,848
Year(s) Acquired	2,012
Overlake [Member] | Commercial Real Estate [Member] | Redmond, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	7,333
Gross Amount at Which Carried at December 31, 2018, Land	23,122
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	48,439
Gross Amount at Which Carried at December 31, 2018, Total	71,561
Accumulated Depreciation	$ 30,346
Year(s) Acquired	2,007
Renton [Member] | Commercial Real Estate [Member] | Renton, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
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	645
Gross Amount at Which Carried at December 31, 2018, Land	330
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	1,534
Gross Amount at Which Carried at December 31, 2018, Total	1,864
Accumulated Depreciation	$ 1,144
Year(s) Acquired	1,997
Highgate at the Mile [Member] | Multifamily [Member] | McLean, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Number of units of Real Estate Property | property	395
Initial Cost to Company, Land	$ 21,814
Initial Cost to Company, Buildings and Improvements	84,916
Gross Amount at Which Carried at December 31, 2018, Land	21,814
Gross Amount at Which Carried at December 31, 2018, Buildings and Improvements	84,916
Gross Amount at Which Carried at December 31, 2018, Total	106,730
Accumulated Depreciation	$ 2,649
Year(s) Acquired	2,018
Minimum [Member] | Buena Park Industrial Center [Member] | Commercial Real Estate [Member] | Buena Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Carson [Member] | Commercial Real Estate [Member] | Carson, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Cerritos Business Center [Member] | Commercial Real Estate [Member] | Cerritos, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Cerritos/Edwards [Member] | Commercial Real Estate [Member] | Cerritos, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Concord Business Park [Member] | Commercial Real Estate [Member] | Concord, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Culver City [Member] | Commercial Real Estate [Member] | Culver City, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Bayview Business Park [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Christy Business Park [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Industrial Drive Distribution Center [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Bay Center Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Cabot Distribution Center [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Diablo Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Eden Landing [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Hayward Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Huntwood Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Parkway Commerce [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Laguna Hills Commerce Center [Member] | Commercial Real Estate [Member] | Laguna Hills, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Plaza Del Lago [Member] | Commercial Real Estate [Member] | Laguna Hills, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Canada Business Center [Member] | Commercial Real Estate [Member] | Lake Forest, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Dixon Landing Business Park [Member] | Commercial Real Estate [Member] | Milpitas, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Monterey/Calle [Member] | Commercial Real Estate [Member] | Monterey, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Monterey Park [Member] | Commercial Real Estate [Member] | Monterey Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Port Of Oakland [Member] | Commercial Real Estate [Member] | Oakland, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Kearney Mesa [Member] | Commercial Real Estate [Member] | San Diego, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Lusk [Member] | Commercial Real Estate [Member] | San Diego, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Rose Canyon Business Park [Member] | Commercial Real Estate [Member] | San Diego, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Charcot Business Park [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Las Plumas [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Little Orchard Distribution Center [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Montague Industrial Park [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Oakland Road [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Rogers Ave [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Doolittle Business Park [Member] | Commercial Real Estate [Member] | San Leandro, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Bayshore Corporate Center [Member] | Commercial Real Estate [Member] | San Mateo, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | San Ramon/Norris Canyon [Member] | Commercial Real Estate [Member] | San Ramon, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Commerce Park [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Santa Clara Tech Park [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Walsh At Lafayette [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Signal Hill [Member] | Commercial Real Estate [Member] | Signal Hill, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Airport Boulevard [Member] | Commercial Real Estate [Member] | So San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | South San Francisco/Produce [Member] | Commercial Real Estate [Member] | So San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Studio City/Ventura [Member] | Commercial Real Estate [Member] | Studio City, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Kifer Industrial Park [Member] | Commercial Real Estate [Member] | Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Torrance [Member] | Commercial Real Estate [Member] | Torrance, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Boca Commerce [Member] | Commercial Real Estate [Member] | Boca Raton, FL [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | MICC [Member] | Commercial Real Estate [Member] | Miami, FL [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Wellington [Member] | Commercial Real Estate [Member] | Wellington, FL [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Ammendale [Member] | Commercial Real Estate [Member] | Beltsville, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Gaithersburgh/Christopher [Member] | Commercial Real Estate [Member] | Gaithersburg, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Metro Park North [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Parklawn Business Park [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | The Grove 270 [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Westech Business Park [Member] | Commercial Real Estate [Member] | Silver Spring, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Ben White [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Lamar Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | McKalla [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | McNeil [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Rutland [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Waterford [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Braker Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Mopac Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Southpark Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Valwood Business Center [Member] | Commercial Real Estate [Member] | Carrolton, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Northway Plaza [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Springlake Business Center [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Westwood Business Park [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Eastgate [Member] | Commercial Real Estate [Member] | Garland, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Freeport Business Park [Member] | Commercial Real Estate [Member] | Irving, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | NFTZ [Member] | Commercial Real Estate [Member] | Irving, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | NFTZ [Member] | Commercial Real Estate [Member] | Las Colinas, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ground leases expiration date	Dec. 31, 2029
Minimum [Member] | Royal Tech [Member] | Commercial Real Estate [Member] | Irving, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | La Prada [Member] | Commercial Real Estate [Member] | Mesquite, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | The Summit [Member] | Commercial Real Estate [Member] | Plano, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Arapaho Business Park [Member] | Commercial Real Estate [Member] | Richardson, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Richardson Business Park [Member] | Commercial Real Estate [Member] | Richardson, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Bren Mar [Member] | Commercial Real Estate [Member] | Alexandria, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Eisenhower [Member] | Commercial Real Estate [Member] | Alexandria, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Beaumont [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Dulles South [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Lafayette [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Park East [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Fair Oaks Business Park [Member] | Commercial Real Estate [Member] | Fairfax, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Monroe [Member] | Commercial Real Estate [Member] | Herndon, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Gunston [Member] | Commercial Real Estate [Member] | Lorton, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | The Mile [Member] | Commercial Real Estate [Member] | McLean, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Prosperity at Merrifield [Member] | Commercial Real Estate [Member] | Merrifield, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Alban Road [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | I-95 [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Fullterton Road Industrial Park [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Northern Virginia Industrial Park [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Northpointe [Member] | Commercial Real Estate [Member] | Sterling, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Shaw Road [Member] | Commercial Real Estate [Member] | Sterling, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Tysons Corporate Center [Member] | Commercial Real Estate [Member] | Vienna, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Woodbridge [Member] | Commercial Real Estate [Member] | Woodbridge, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | 212th Business Park [Member] | Commercial Real Estate [Member] | Kent, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Overlake [Member] | Commercial Real Estate [Member] | Redmond, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Renton [Member] | Commercial Real Estate [Member] | Renton, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Minimum [Member] | Highgate at the Mile [Member] | Multifamily [Member] | McLean, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	5 years
Maximum [Member] | Buena Park Industrial Center [Member] | Commercial Real Estate [Member] | Buena Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Carson [Member] | Commercial Real Estate [Member] | Carson, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Cerritos Business Center [Member] | Commercial Real Estate [Member] | Cerritos, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Cerritos/Edwards [Member] | Commercial Real Estate [Member] | Cerritos, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Concord Business Park [Member] | Commercial Real Estate [Member] | Concord, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Culver City [Member] | Commercial Real Estate [Member] | Culver City, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Bayview Business Park [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Christy Business Park [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Industrial Drive Distribution Center [Member] | Commercial Real Estate [Member] | Fremont, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Bay Center Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Cabot Distribution Center [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Diablo Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Eden Landing [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Hayward Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Huntwood Business Park [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Parkway Commerce [Member] | Commercial Real Estate [Member] | Hayward, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Laguna Hills Commerce Center [Member] | Commercial Real Estate [Member] | Laguna Hills, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Plaza Del Lago [Member] | Commercial Real Estate [Member] | Laguna Hills, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Canada Business Center [Member] | Commercial Real Estate [Member] | Lake Forest, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Dixon Landing Business Park [Member] | Commercial Real Estate [Member] | Milpitas, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Monterey/Calle [Member] | Commercial Real Estate [Member] | Monterey, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Monterey Park [Member] | Commercial Real Estate [Member] | Monterey Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Port Of Oakland [Member] | Commercial Real Estate [Member] | Oakland, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Kearney Mesa [Member] | Commercial Real Estate [Member] | San Diego, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Lusk [Member] | Commercial Real Estate [Member] | San Diego, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Rose Canyon Business Park [Member] | Commercial Real Estate [Member] | San Diego, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Charcot Business Park [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Las Plumas [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Little Orchard Distribution Center [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Montague Industrial Park [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Oakland Road [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Rogers Ave [Member] | Commercial Real Estate [Member] | San Jose, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Doolittle Business Park [Member] | Commercial Real Estate [Member] | San Leandro, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Bayshore Corporate Center [Member] | Commercial Real Estate [Member] | San Mateo, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | San Ramon/Norris Canyon [Member] | Commercial Real Estate [Member] | San Ramon, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Commerce Park [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Santa Clara Tech Park [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Walsh At Lafayette [Member] | Commercial Real Estate [Member] | Santa Clara, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Signal Hill [Member] | Commercial Real Estate [Member] | Signal Hill, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Airport Boulevard [Member] | Commercial Real Estate [Member] | So San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | South San Francisco/Produce [Member] | Commercial Real Estate [Member] | So San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Studio City/Ventura [Member] | Commercial Real Estate [Member] | Studio City, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Kifer Industrial Park [Member] | Commercial Real Estate [Member] | Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Torrance [Member] | Commercial Real Estate [Member] | Torrance, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Boca Commerce [Member] | Commercial Real Estate [Member] | Boca Raton, FL [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | MICC [Member] | Commercial Real Estate [Member] | Miami, FL [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Wellington [Member] | Commercial Real Estate [Member] | Wellington, FL [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Ammendale [Member] | Commercial Real Estate [Member] | Beltsville, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Gaithersburgh/Christopher [Member] | Commercial Real Estate [Member] | Gaithersburg, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Metro Park North [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Parklawn Business Park [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | The Grove 270 [Member] | Commercial Real Estate [Member] | Rockville, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Westech Business Park [Member] | Commercial Real Estate [Member] | Silver Spring, MD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Ben White [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Lamar Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | McKalla [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | McNeil [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Rutland [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Waterford [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Braker Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Mopac Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Southpark Business Park [Member] | Commercial Real Estate [Member] | Austin, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Valwood Business Center [Member] | Commercial Real Estate [Member] | Carrolton, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Northway Plaza [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Springlake Business Center [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Westwood Business Park [Member] | Commercial Real Estate [Member] | Farmers Branch, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Eastgate [Member] | Commercial Real Estate [Member] | Garland, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Freeport Business Park [Member] | Commercial Real Estate [Member] | Irving, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | NFTZ [Member] | Commercial Real Estate [Member] | Irving, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | NFTZ [Member] | Commercial Real Estate [Member] | Las Colinas, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ground leases expiration date	Dec. 31, 2030
Maximum [Member] | Royal Tech [Member] | Commercial Real Estate [Member] | Irving, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | La Prada [Member] | Commercial Real Estate [Member] | Mesquite, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | The Summit [Member] | Commercial Real Estate [Member] | Plano, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Arapaho Business Park [Member] | Commercial Real Estate [Member] | Richardson, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Richardson Business Park [Member] | Commercial Real Estate [Member] | Richardson, TX [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Bren Mar [Member] | Commercial Real Estate [Member] | Alexandria, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Eisenhower [Member] | Commercial Real Estate [Member] | Alexandria, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Beaumont [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Dulles South [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Lafayette [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Park East [Member] | Commercial Real Estate [Member] | Chantilly, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Fair Oaks Business Park [Member] | Commercial Real Estate [Member] | Fairfax, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Monroe [Member] | Commercial Real Estate [Member] | Herndon, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Gunston [Member] | Commercial Real Estate [Member] | Lorton, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | The Mile [Member] | Commercial Real Estate [Member] | McLean, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Prosperity at Merrifield [Member] | Commercial Real Estate [Member] | Merrifield, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Alban Road [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | I-95 [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Fullterton Road Industrial Park [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Northern Virginia Industrial Park [Member] | Commercial Real Estate [Member] | Springfield, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Northpointe [Member] | Commercial Real Estate [Member] | Sterling, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Shaw Road [Member] | Commercial Real Estate [Member] | Sterling, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Tysons Corporate Center [Member] | Commercial Real Estate [Member] | Vienna, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Woodbridge [Member] | Commercial Real Estate [Member] | Woodbridge, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | 212th Business Park [Member] | Commercial Real Estate [Member] | Kent, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Overlake [Member] | Commercial Real Estate [Member] | Redmond, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Renton [Member] | Commercial Real Estate [Member] | Renton, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	30 years
Maximum [Member] | Highgate at the Mile [Member] | Multifamily [Member] | McLean, VA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Depreciable Lives (Years)	40 years