Whitestone REIT (WSR) 10-K 2 Mar 20 2019 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Mar. 02, 2020	Jun. 28, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	Whitestone REIT
Entity Central Index Key	0001175535
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		42,046,732
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 509,334,507

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Real estate assets, at cost
Property		$ 1,099,955	$ 1,052,238
Accumulated depreciation		(137,933)	(113,300)
Total real estate assets		962,022	938,938
Investment in real estate partnership		34,097	26,236
Cash and cash equivalents		15,530	13,658
Restricted cash		113	128
Escrows and acquisition deposits		8,388	8,211
Accrued rents and accounts receivable, net of allowance for doubtful accounts		22,854	21,642
Receivable due from related party		477	394
Financed receivable due from related party		0	5,661
Unamortized lease commissions, legal fees and loan costs		8,960	6,698
Prepaid expenses and other assets(1)	[1]	3,819	7,306
Operating lease right of use assets		1,328
Total assets		1,056,260	1,028,872
Liabilities:
Notes payable		644,699	618,205
Accounts payable and accrued expenses(2)	[2]	39,336	33,729
Operating lease liabilities		1,331
Payable due to related party		307	58
Tenants' security deposits		6,617	6,130
Dividends and distributions payable		12,203	11,600
Total liabilities		703,162	669,722
Commitments and contingencies:		0	0
Equity:
Preferred shares, $0.001 par value per share; 50,000,000 shares authorized; none issued and outstanding as of December 31, 2019 and December 31, 2018		0	0
Common shares, $0.001 par value per share; 400,000,000 shares authorized; 41,492,117 and 39,778,029 issued and outstanding as of December 31, 2019 and December 31, 2018, respectively		41	39
Additional paid-in capital		554,816	527,662
Accumulated deficit		(204,049)	(181,361)
Accumulated other comprehensive gain (loss)		(5,491)	4,116
Total Whitestone REIT shareholders' equity		345,317	350,456
Noncontrolling interest in subsidiary		7,781	8,694
Total equity		353,098	359,150
Total liabilities and equity		$ 1,056,260	$ 1,028,872
[1]	Operating lease right of use assets (net) (related to adoption of Topic 842)
[2]	Operating lease liabilities (related to adoption of Topic 842)

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Stockholders' Equity:
Preferred shares, par value per share (in dollars per share)	$ 0.001	$ 0.001
Preferred shares, shares authorized (in shares)	50,000,000	50,000,000
Preferred shares, shares issued (in shares)	0	0
Preferred shares, shares outstanding (in shares)	0	0
Common shares, par value per share (in dollars per share)	$ 0.001	$ 0.001
Common shares, authorized (in shares)	400,000,000	400,000,000
Common shares, issued (in shares)	41,492,117	39,778,029
Common shares, outstanding (in shares)	41,492,117	39,778,029

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues
Rental	[1]	$ 117,014
Rental	[1]		$ 117,464	$ 124,792
Management, transaction, and other fees		2,237	2,399	1,167
Total revenues		119,251	119,863	125,959
Operating expenses
Depreciation and amortization		26,740	25,679	27,240
Operating and maintenance		20,611	21,069	24,213
Real estate taxes		16,293	16,362	17,897
General and administrative	[2]	21,661	23,281	23,949
Total operating expenses		85,305	86,391	93,299
Other expenses (income)
Interest expense		26,285	25,177	23,651
Gain on sale of properties		(853)	(4,629)	(16)
Loss on sale or disposal of assets		215	82	183
Interest, dividend and other investment income		(659)	(1,055)	(410)
Total other expense		24,988	19,575	23,408
Income before equity investments in real estate partnerships and income tax		8,958	13,897	9,252
Equity in earnings of real estate partnership		15,076	8,431	0
Provision for income tax		(400)	(347)	(386)
Profit sharing expense		0	0	(278)
Income from continuing operations		23,634	21,981	8,588
Gain on sale of property from discontinued operations		594	0	0
Income from discontinued operations		594	0	0
Net income		24,228	21,981	8,588
Less: Net income attributable to noncontrolling interests		545	550	254
Net income attributable to Whitestone REIT		$ 23,683	$ 21,431	$ 8,334
Basic Earnings Per Share:
Income from continuing operations attributable to Whitestone REIT, excluding amounts attributable to unvested restricted shares (in dollars per share)		$ 0.57	$ 0.54	$ 0.22
Income from discontinued operations attributable to Whitestone REIT (in dollars per share)		0.02	0	0
Net income attributable to common shareholders, excluding amounts attributable to unvested restricted shares (in dollars per share)		0.59	0.54	0.22
Diluted Earnings Per Share:
Income from continuing operations attributable to Whitestone REIT, excluding amounts attributable to unvested restricted shares (in dollars per share)		0.56	0.52	0.22
Income from discontinued operations attributable to Whitestone REIT (in dollars per share)		0.01	0	0
Net income attributable to common shareholders, excluding amounts attributable to unvested restricted shares (in dollars per share)		$ 0.57	$ 0.52	$ 0.22
Weighted average number of common shares outstanding:
Basic (in shares)		40,184	39,274	35,428
Diluted (in shares)		41,462	40,612	36,255
Consolidated Statements of Comprehensive Income
Net income		$ 24,228	$ 21,981	$ 8,588
Other comprehensive gain (loss)
Unrealized gain (loss) on cash flow hedging activities		(9,828)	1,192	2,022
Unrealized gain on available-for-sale marketable securities		0	18	118
Comprehensive income		14,400	23,191	10,728
Less: Net income attributable to noncontrolling interests		545	550	254
Less: Comprehensive gain (loss) attributable to noncontrolling interests		(221)	30	63
Comprehensive income attributable to Whitestone REIT		14,076	22,611	10,411
Rental revenues (under Topic 842)
Rental revenues		86,750
Recoveries		31,748
Bad debt		(1,484)
Total rental	[1]	$ 117,014
Rental revenues (under Topic 840)
Rental revenues			86,644	94,568
Recoveries			30,820	30,224
Total rental	[1]		117,464	124,792
Bad debt (prior to adoption of Topic 842)			$ 1,391	$ 2,340
[1]	(1) Rental Rental revenues $86,750 $86,644 $94,568Recoveries 31,748 30,820 30,224Bad debt (1,484) N/A N/ATotal rental $117,014 $117,464 $124,792
[2]	Bad debt included in operating and maintenance expenses prior to adoption of Topic 842

Consolidated Statement of Chang

Consolidated Statement of Changes in Equity - USD ($) $ in Thousands		Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Gain (Loss) [Member]	Total Shareholders' Equity [Member]	Noncontrolling Interests [Member]
Beginning Balance (in shares) at Dec. 31, 2016			29,468,000
Beginning Balance (in units) at Dec. 31, 2016								1,103,000
Beginning Balance at Dec. 31, 2016		$ 267,628	$ 29	$ 396,494	$ (141,695)	$ 859	$ 255,687	$ 11,941
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exchange of noncontrolling interest OP units for common shares (in shares)			(19,000)					(19,000)
Exchange of noncontrolling interest OP units for common shares		0		206			206	$ (206)
Issuance of common shares under dividend reinvestment plan (in shares)			9,000
Issuance of common shares under dividend reinvestment plan		127		127			127
Issuance of common shares - ATM Program, net of offering costs (in shares)			1,324,000
Issuance of common shares - ATM Program, net of offering costs		18,517	$ 1	18,516			18,517
Issuance of common shares - overnight offering, net of offering costs (in shares)			8,019,000
Issuance of common shares - overnight offering, net of offering costs		99,895	$ 8	99,887
Repurchase of common shares (in shares)	[1]		(324,000)
Repurchase of common shares	[1]	(4,339)		(4,339)			(4,339)
Shared-based compensation (in shares)			707,000
Share-based compensation		10,410		10,410			10,410
Distributions		(44,562)			(43,323)		(43,323)	(1,239)
Unrealized gain on change in fair value of cash flow hedge		2,022				1,962	1,962	60
Unrealized gain on change in fair value of available-for sale marketable securities		118				115	115	3
Reallocation of ownership percentage between parent and subsidiary		0		13			13	(13)
Net income		8,588			8,334		8,334	254
Ending Balance at Dec. 31, 2017		358,404	$ 38	521,314	(176,684)	2,936	347,604	$ 10,800
Ending Balance (in shares) at Dec. 31, 2017			39,222,000
Ending Balance (in units) at Dec. 31, 2017								1,084,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exchange of noncontrolling interest OP units for common shares (in shares)			(155,000)					(155,000)
Exchange of noncontrolling interest OP units for common shares		0	$ 1	1,545			1,546	$ (1,546)
Issuance of common shares under dividend reinvestment plan (in shares)			10,000
Issuance of common shares under dividend reinvestment plan		133		133			133
Exchange offer costs		(126)		(126)			(126)
Repurchase of common shares (in shares)	[1]		(160,000)
Repurchase of common shares	[1]	(1,961)		(1,961)			(1,961)
Shared-based compensation (in shares)			551,000
Share-based compensation		6,742		6,742			6,742
Distributions		(46,352)			(45,227)		(45,227)	(1,125)
Unrealized gain on change in fair value of cash flow hedge		1,192				1,162	1,162	30
Unrealized gain on change in fair value of available-for sale marketable securities		18				18	18
Reallocation of ownership percentage between parent and subsidiary		0		15			15	(15)
Net income		21,981			21,431		21,431	550
Ending Balance at Dec. 31, 2018		$ 359,150	$ 39	527,662	(181,361)	4,116	350,456	$ 8,694
Ending Balance (in shares) at Dec. 31, 2018		39,778,029	39,778,000
Ending Balance (in units) at Dec. 31, 2018								929,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exchange of noncontrolling interest OP units for common shares (in shares)			(20,000)					(20,000)
Exchange of noncontrolling interest OP units for common shares		$ 0		186			186	$ (186)
Issuance of common shares under dividend reinvestment plan (in shares)			10,000
Issuance of common shares under dividend reinvestment plan		137		137			137
Exchange offer costs		(120)		(120)			(120)
Issuance of common shares - ATM Program, net of offering costs (in shares)			1,612,000
Issuance of common shares - ATM Program, net of offering costs		21,246	$ 2	21,244			21,246
Repurchase of common shares (in shares)	[1]		(65,000)
Repurchase of common shares	[1]	(776)		(776)			(776)
Shared-based compensation (in shares)			137,000
Share-based compensation		6,483		6,483			6,483
Distributions		(47,422)			(46,371)		(46,371)	(1,051)
Unrealized gain on change in fair value of cash flow hedge		(9,828)				(9,607)	(9,607)	(221)
Unrealized gain on change in fair value of available-for sale marketable securities		0
Net income		24,228			23,683		23,683	545
Ending Balance at Dec. 31, 2019		$ 353,098	$ 41	$ 554,816	$ (204,049)	$ (5,491)	$ 345,317	$ 7,781
Ending Balance (in shares) at Dec. 31, 2019		41,492,117	41,492,000
Ending Balance (in units) at Dec. 31, 2019								909,000
[1]	During the years ended December 31, 2019, 2018 and 2017, the Company acquired common shares held by employees who tendered owned common shares to satisfy the tax withholding on the lapse of certain restrictions on restricted shares.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Cash flows from operating activities:
Income from continuing operations		$ 23,634		$ 21,981		$ 8,588
Net income from discontinued operations		594		0		0
Net income		24,228		21,981		8,588
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		26,740		25,679		27,240
Amortization of deferred loan costs		1,095		1,092		1,283
Amortization of notes payable discount		0		0		508
Loss on sale of marketable securities		0		20		91
Gain on sale or disposal of assets and properties		(638)		(4,547)		167
Bad debt		1,484		1,391		2,340
Share-based compensation		6,483		6,741		10,410
Equity in earnings of real estate partnership		(15,076)		(8,431)		0
Changes in operating assets and liabilities:
Escrows and acquisition deposits		(177)		(295)		(3,570)
Accrued rents and accounts receivable		(2,998)		(1,893)		(5,430)
Receivable due from (to) related party		(83)		610		0
Distributions from real estate partnership		6,926		1,324		0
Unamortized lease commissions, legal fees and loan costs		(1,824)		(1,676)		(2,299)
Prepaid expenses and other assets		(4,163)		1,175		168
Accounts payable and accrued expenses		5,609		(2,429)		1,337
Payable due to (from) related party		249		(1,621)		0
Tenants' security deposits		487		436		565
Net cash provided by operating activities		47,748		39,557		41,398
Cash flows from investing activities:
Acquisitions of real estate		(34,804)		0		(125,468)
Additions to real estate		(13,243)		(11,638)		(17,575)
Proceeds from sales of properties		0		12,574		26
Proceeds from financed receivable due from related party		5,661		9,812		0
Investment in real estate partnership		0		0		(2,394)
Proceeds from sales of marketable securities		0		30		513
Net cash provided by (used in) investing activities		(42,386)		10,778		(144,898)
Net cash provided by investing activities of discontinued operations		(594)		0		0
Cash flows from financing activities:
Distributions paid to common shareholders		(45,627)		(44,944)		(40,472)
Distributions paid to OP unit holders		(1,055)		(1,155)		(1,241)
Proceeds from issuance of common shares, net of offering costs		21,244		0		118,412
Payments of exchange offer costs		(120)		(126)		0
Proceeds from bonds payable		100,000		0		0
Net proceeds from (payments of) credit facility		(66,700)		9,000		45,600
Repayments of notes payable		(8,095)		(2,543)		(11,543)
Payments of loan origination costs		(2,970)		(30)		(695)
Repurchase of common shares		(776)		(1,961)		(4,339)
Net cash used in financing activities		(4,099)		(41,759)		105,722
Net increase in cash, cash equivalents and restricted cash		1,857		8,576		2,222
Cash, cash equivalents and restricted cash at beginning of period		13,786	[1]	5,210	[1]	2,988
Cash, cash equivalents and restricted cash at end of period (1)	[1]	15,643		13,786		5,210
Supplemental disclosure of cash flow information:
Cash paid for interest		25,360		24,610		22,541
Cash paid for taxes		396		304		337
Non cash investing and financing activities:
Disposal of fully depreciated real estate		234		937		1,036
Financed insurance premiums		1,238		1,273		1,115
Value of shares issued under dividend reinvestment plan		137		133		127
Value of common shares exchanged for OP units		186		1,546		206
Change in fair value of available-for-sale securities		0		18		118
Change in fair value of cash flow hedge		(9,828)		1,192		2,022
Reallocation of ownership percentage between parent and subsidiary		0		15		13
Debt issued with acquisitions of real estate		0		0		80,000
Property received as termination fee		0		250		0
Cash, cash equivalents and restricted cash
Total cash, cash equivalents and restricted cash	[1]	$ 15,643		$ 13,786		$ 5,210
[1]	For a reconciliation of cash, cash equivalents and restricted cash, see supplemental disclosures below.

Description of Business and Nat

Description of Business and Nature of Operations	12 Months Ended
	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Nature of Operations	DESCRIPTION OF BUSINESS AND NATURE OF OPERATIONS Whitestone REIT (“Whitestone”) was formed as a real estate investment trust, pursuant to the Texas Real Estate Investment Trust Act on August 20, 1998. In July 2004, we changed our state of organization from Texas to Maryland pursuant to a merger where we merged directly with and into a Maryland real estate investment trust formed for the sole purpose of the reorganization and the conversion of each of our outstanding common shares of beneficial interest of the Texas entity into 1.42857 common shares of beneficial interest of the Maryland entity. We serve as the general partner of Whitestone REIT Operating Partnership, L.P. (the “Operating Partnership” or “WROP” or “OP”), which was formed on December 31, 1998 as a Delaware limited partnership. We currently conduct substantially all of our operations and activities through the Operating Partnership. As the general partner of the Operating Partnership, we have the exclusive power to manage and conduct the business of the Operating Partnership, subject to certain customary exceptions. As of December 31, 2019 , 2018 and 2017 , we owned 58 , 57 , and 73 commercial properties, respectively, in and around Austin, Chicago, Dallas-Fort Worth, Houston, Phoenix and San Antonio. As of December 31, 2019 , these properties consist of: Consolidated Operating Portfolio • 53 wholly-owned properties that meet our Community Centered Properties ® strategy; and • five parcels of land held for future development. As of December 31, 2019 , we, through our equity-method investment in Pillarstone Capital REIT Operating Partnership LP (“Pillarstone” or “Pillarstone OP”), owned a majority interest in eight properties that do not meet our Community Centered Property® strategy containing approximately 0.9 million square feet of GLA (the “Pillarstone Properties”). We own 81.4% of the total outstanding units of Pillarstone OP, which we account for using the equity method. We also manage the day-to-day operations of Pillarstone OP.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Consolidation. We are the sole general partner of the Operating Partnership and possess full legal control and authority over the operations of the Operating Partnership. As of December 31, 2019 , 2018 and 2017 , we owned a majority of the partnership interests in the Operating Partnership. Consequently, the accompanying consolidated financial statements include the accounts of the Operating Partnership. Noncontrolling interest in the accompanying consolidated financial statements represents the share of equity and earnings of the Operating Partnership allocable to holders of partnership interests other than us. Net income or loss is allocated to noncontrolling interests based on the weighted-average percentage ownership of the Operating Partnership during the year. Issuance of additional common shares of beneficial interest in Whitestone (the “common shares”) and units of limited partnership interest in the Operating Partnership that are convertible into cash or, at our option, common shares on a one -for- one basis (the “OP units”) changes the percentage of ownership interests of both the noncontrolling interests and Whitestone. Profit-sharing Method. In accordance with the Financial Accounting Standards Board’s (“FASB”) guidance applicable to sales of real estate or interests therein, specifically FASB Accounting Standards Codification (“ASC”) 360-20, “Real Estate Sales,” Topic 606, “Revenue from Contracts with Customers” and ASC 610, “Other Income–Gains and Losses from the Derecognition of Nonfinancial Assets,” we did not recognize the sale of assets to Pillarstone OP in the Contribution (as defined in Note 5) and accounted for the transaction under the profit-sharing method for the year ended December 31, 2017. We recognized Pillarstone OP’s real estate assets and notes payables in our consolidated balance sheets. Additionally, the profits and losses of Pillarstone OP not attributable to the Company are reported as profit sharing expense. As a result of the adoption of Topic 606 and ASC 610, the Company derecognized the underlying assets and liabilities associated with the Contribution as of January 1, 2018 and recognized the Company’s investment in Pillarstone OP under the equity method. Equity Method. For the years prior to December 31, 2017, Pillarstone OP was accounted for under the profit-sharing method. We adopted Topic 606 and ASC 610 as of January 1, 2018, resulting in the derecognition of the underlying assets and liabilities associated with the Contribution (defined below) as of January 1, 2018 and the recognition of the Company’s investment in Pillarstone OP under the equity method. See Note 5 for additional disclosure on Pillarstone OP. As of December 31, 2019 , we, through our investment in Pillarstone OP, owned a majority interest in eight properties that do not meet our Community Centered Property® strategy containing approximately 0.9 million square feet of GLA. We own 81.4% of the total outstanding units of Pillarstone OP. We also manage the day-to-day operations of Pillarstone OP. In this Annual Report on Form 10-K, unless otherwise indicated, we do not include the Pillarstone Properties when we refer to our properties. Basis of Accounting. Our financial records are maintained on the accrual basis of accounting whereby revenues are recognized when earned and expenses are recorded when incurred. Use of Estimates. The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates that we use include the estimated fair values of properties acquired, the estimated useful lives for depreciable and amortizable assets and costs, the estimated allowance for doubtful accounts, the estimated fair value of interest rate swaps and the estimates supporting our impairment analysis for the carrying values of our real estate assets. Actual results could differ from those estimates. Reclassifications. We have reclassified certain prior year amounts in the accompanying consolidated financial statements in order to be consistent with the current fiscal year presentation. Other than the effects noted below, these reclassifications had no effect on net income, total assets, total liabilities or equity. Restricted Cash. We classify all cash pledged as collateral to secure certain obligations and all cash whose use is limited as restricted cash. During 2015, pursuant to the terms of our $15.1 million 4.99% Note, due January 6, 2024, which is collateralized by our Anthem Marketplace property, we were required by the lenders thereunder to establish a cash management account controlled by the lenders to collect all amounts generated by our Anthem Marketplace property in order to collateralize such promissory note. Share-Based Compensation. From time to time, we award nonvested restricted common share awards or restricted common share unit awards, which may be converted into common shares, to executive officers and employees under our 2018 Long-Term Equity Incentive Ownership Plan (the “2018 Plan”). Awarded shares and units vest when certain performance conditions are met. We recognize compensation expense when achievement of the performance conditions is probable based on management’s most recent estimates using the fair value of the shares as of the grant date. We recognized $6.5 million , $6.8 million and $10.4 million in share-based compensation expense for the years ended December 31, 2019 , 2018 and 2017 , respectively. At our annual meeting of shareholders on May 11, 2017, our shareholders voted to approve the 2018 Plan. The 2018 Plan provides for the issuance of up to 3,433,831 common shares and OP units pursuant to awards under the 2018 Plan. The 2018 Plan became effective on July 30, 2018, which was the day after the 2008 Plan expired. Noncontrolling Interests. Noncontrolling interests are the portion of equity in a subsidiary not attributable to a parent. The ownership interests not held by the parent are considered noncontrolling interests. Accordingly, we have reported noncontrolling interests in equity on the consolidated balance sheets but separate from Whitestone’s equity. On the consolidated statements of operations and comprehensive income, subsidiaries are reported at the consolidated amount, including both the amount attributable to Whitestone and noncontrolling interests. Consolidated statements of changes in equity are included for both quarterly and annual financial statements, including beginning balances, activity for the period and ending balances for shareholders’ equity, noncontrolling interests and total equity. Revenue Recognition. All leases on our properties are classified as operating leases, and the related rental income is recognized on a straight-line basis over the terms of the related leases. Differences between rental income earned and amounts due per the respective lease agreements are capitalized or charged, as applicable, to accrued rents and accounts receivable. Percentage rents are recognized as rental income when the thresholds upon which they are based have been met. Recoveries from tenants for taxes, insurance, and other operating expenses are recognized as revenues in the period the corresponding costs are incurred. We combine lease and nonlease components in lease contracts, which includes combining base rent, recoveries, and percentage rents into a single line item, Rental , within the consolidated statements of operations and comprehensive income. Additionally, we have tenants who pay real estate taxes directly to the taxing authority. We exclude these costs paid directly by the tenant to third parties on our behalf from revenue recognized and the associated property operating expense. Other property income primarily includes amounts recorded in connection with management fees and lease termination fees. Pillarstone OP pays us management fees for property management, leasing and day-to-day advisory and administrative services. Their obligations are satisfied over time. Pillarstone OP is billed monthly and typically pays quarterly. Revenues are governed by the Management Agreements (as defined in Note 5). Refer to Note 5 to our accompanying consolidated financial statements for additional information regarding the Management Agreements with Pillarstone OP. Additionally, we recognize lease termination fees in the year that the lease is terminated and collection of the fee is probable. Amounts recorded within other property income are accounted for at the point in time when control of the goods or services transfers to the customer and our performance obligation is satisfied. Cash and Cash Equivalents. We consider all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents. Cash and cash equivalents as of December 31, 2019 and 2018 consisted of demand deposits at commercial banks and brokerage accounts. We may have net book credit balances in our primary disbursement accounts at the end of a reporting period. We classify such credit balances as accounts payable in our consolidated balance sheets as checks presented for payment to these accounts are not payable by our banks under overdraft arrangements, and, therefore, do not represent short-term borrowings. Marketable Securities. We classify our existing marketable equity securities as available-for-sale in accordance with the Financial Accounting Standards Board’s (“FASB”) Investments-Debt and Equity Securities guidance. These securities are carried at fair value with unrealized gains and losses reported in equity as a component of accumulated other comprehensive income or loss. The fair value of the marketable securities is determined using Level 1 inputs under FASB Accounting Standards Codification (“ASC”) 820, “ Fair Value Measurements and Disclosures.” Level 1 inputs represent quoted prices available in an active market for identical investments as of the reporting date. Gains and losses on securities sold are based on the specific identification method, and are reported as a component of interest, dividend and other investment income. Real Estate Development Properties. Land, buildings and improvements are recorded at cost. Expenditures related to the development of real estate are carried at cost which includes capitalized carrying charges and development costs. Carrying charges (interest, real estate taxes, loan fees, and direct and indirect development costs related to buildings under construction) are capitalized as part of construction in progress. The capitalization of such costs ceases when the property, or any completed portion, becomes available for occupancy. For the year ended December 31, 2019 , approximately $500,000 and $320,000 in interest expense and real estate taxes, respectively, were capitalized. For the year ended December 31, 2018 , approximately $574,000 and $365,000 in interest expense and real estate taxes, respectively, were capitalized. For the year ended December 31, 2017 , approximately $439,000 and $277,000 in interest expense and real estate taxes, respectively, were capitalized. Acquired Properties and Acquired Lease Intangibles. We allocate the purchase price of the acquired properties to land, building and improvements, identifiable intangible assets and to the acquired liabilities based on their respective fair values at the time of purchase. Identifiable intangibles include amounts allocated to acquired out-of-market leases, the value of in-place leases and customer relationship value, if any. We determine fair value based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends and specific market and economic conditions that may affect the property. Factors considered by management in our analysis of determining the as-if-vacant property value include an estimate of carrying costs during the expected lease-up periods considering market conditions, and costs to execute similar leases. In estimating carrying costs, management includes real estate taxes, insurance and estimates of lost rentals at market rates during the expected lease-up periods, tenant demand and other economic conditions. Management also estimates costs to execute similar leases including leasing commissions, tenant improvements, legal and other related expenses. Intangibles related to out-of-market leases and in-place lease value are recorded as acquired lease intangibles and are amortized as an adjustment to rental revenue or amortization expense, as appropriate, over the remaining terms of the underlying leases. Premiums or discounts on acquired out-of-market debt are amortized to interest expense over the remaining term of such debt. Depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of 5 to 39 years for improvements and buildings, respectively. Tenant improvements are depreciated using the straight-line method over the life of the improvement or remaining term of the lease, whichever is shorter. Impairment. We review our properties for impairment at least annually or whenever events or changes in circumstances indicate that the carrying amount of the assets, including accrued rental income, may not be recoverable through operations. We determine whether an impairment in value has occurred by comparing the estimated future cash flows (undiscounted and without interest charges), including the estimated residual value of the property, with the carrying cost of the property. If impairment is indicated, a loss will be recorded for the amount by which the carrying value of the property exceeds its fair value. Management has determined that there has been no impairment in the carrying value of our real estate assets as of December 31, 2019 . Accrued Rents and Accounts Receivable. Included in accrued rents and accounts receivable are base rents, tenant reimbursements and receivables attributable to recording rents on a straight-line basis. We review the collectability of charges under our tenant operating leases on a regular basis, taking into consideration changes in factors such as the tenant’s payment history, the financial condition of the tenant, business conditions in the industry in which the tenant operates and economic conditions in the area where the property is located. With the adoption of ASC No. 842, Leases (“Topic 842”), as of January 1, 2019 we recognize an adjustment to rental revenue if we deem it probable that the receivable will not be collected. Prior to the adoption of Topic 842, we recognized an allowance for doubtful accounts and bad debt expense of the specific rents receivable. Our review of collectability under our operating leases includes any accrued rental revenues related to the straight-line method of reporting rental revenue. As of December 31, 2019 and 2018 , we had an allowance for uncollectible accounts of $11.2 million and $9.7 million , respectively. For the year ending December 31, 2019 , we recorded an adjustment to rental revenue in the amount of $1.5 million . For the year ending December 31, 2018 and 2017 , we recorded bad debt expense in the amount of $1.4 million and $2.3 million , respectively. Unamortized Lease Commissions and Loan Costs. Leasing commissions are amortized using the straight-line method over the terms of the related lease agreements. Loan costs are amortized on the straight-line method over the terms of the loans, which approximates the interest method. Costs allocated to in-place leases whose terms differ from market terms related to acquired properties are amortized over the remaining life of the respective leases. Prepaids and Other Assets. Prepaids and other assets include escrows established pursuant to certain mortgage financing arrangements for real estate taxes and insurance and acquisition deposits which include earnest money deposits on future acquisitions. Federal Income Taxes. We elected to be taxed as a REIT under the Code beginning with our taxable year ended December 31, 1999. As a REIT, we generally are not subject to federal income tax on income that we distribute to our shareholders. If we fail to qualify as a REIT in any taxable year, we will be subject to federal income tax on our taxable income at regular corporate rates. We believe that we are organized and operate in such a manner as to qualify to be taxed as a REIT, and we intend to operate so as to remain qualified as a REIT for federal income tax purposes. State Taxes. We are subject to the Texas Margin Tax, which is computed by applying the applicable tax rate ( 1% for us) to the profit margin, which, generally, will be determined for us as total revenue less a 30% standard deduction. Although the Texas Margin Tax is not considered an income tax, FASB ASC 740, “Income Taxes” (“ASC 740”) applies to the Texas Margin Tax. As of December 31, 2019 , 2018 and 2017 , we recorded a margin tax provision of $0.4 million , $0.4 million and $0.4 million , respectively. Fair Value of Financial Instruments. Our financial instruments consist primarily of cash, cash equivalents, accounts receivable, accounts and notes payable and investments in marketable securities. The carrying value of cash, cash equivalents, accounts receivable and accounts payable are representative of their respective fair values due to their short-term nature. The fair value of our long-term debt, consisting of fixed rate secured notes, variable rate secured notes and an unsecured revolving credit facility aggregate to approximately $653.7 million and $618.6 million as compared to the book value of approximately $645.9 million and $619.4 million as of December 31, 2019 and 2018 , respectively. The fair value of our long-term debt is estimated on a Level 2 basis (as provided by ASC 820, “Fair Value Measurements and Disclosures ” (“ASC 820”)), using a discounted cash flow analysis based on the borrowing rates currently available to us for loans with similar terms and maturities, discounting the future contractual interest and principal payments. The fair value of our loan guarantee to Pillarstone OP is estimated on a Level 3 basis (as provided by ASC 820, “ Fair Value Measurements and Disclosures” ), using a probability-weighted discounted cash flow analysis based on a discount rate, discounting the loan balance. The fair value of the loan guarantee is $0.1 million and $0.3 million as compared to the book value of approximately $0.1 million and $0.3 million as of December 31, 2019 and 2018 , respectively. Disclosure about fair value of financial instruments is based on pertinent information available to management as of December 31, 2019 and 2018 . Although management is not aware of any factors that would significantly affect the fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since December 31, 2019 and current estimates of fair value may differ significantly from the amounts presented herein. Derivative Instruments and Hedging Activities. We utilize derivative financial instruments, principally interest rate swaps, to manage our exposure to fluctuations in interest rates. We have established policies and procedures for risk assessment, and the approval, reporting and monitoring of derivative financial instruments. We recognize our interest rate swaps as cash flow hedges with the effective portion of the changes in fair value recorded in comprehensive income and subsequently reclassified into earnings in the period that the hedged transaction affects earnings. Any ineffective portion of a cash flow hedge’s change in fair value is recorded immediately into earnings. Our cash flow hedges are determined using Level 2 inputs under ASC 820. Level 2 inputs represent quoted prices in active markets for similar assets or liabilities; quoted prices in markets that are not active; and model-derived valuations whose inputs are observable. As of December 31, 2019 , we consider our cash flow hedges to be highly effective. Concentration of Risk. Substantially all of our revenues are obtained from office, warehouse and retail locations in the Austin, Chicago, Dallas-Fort Worth, Houston, Phoenix and San Antonio metropolitan areas. We maintain cash accounts in major U.S. financial institutions. The terms of these deposits are on demand to minimize risk. The balances of these accounts sometimes exceed the federally insured limits, although no losses have been incurred in connection with these deposits. Recent Accounting Pronouncements. In May 2014, the FASB issued guidance, as amended in subsequent updates, establishing a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and superseded most of the existing revenue recognition guidance. The standard also required an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services and also required certain additional disclosures. This guidance became effective for the reporting periods beginning on or after December 15, 2017, and interim periods within those fiscal years. We adopted this guidance on a modified retrospective basis beginning January 1, 2018 and have derecognized the underlying assets and liabilities associated with the Contribution as of January 1, 2018 and have recognized the Company’s investment in Pillarstone OP under the equity method of accounting. The Company made an adjustment which decreased the Company’s accumulated deficit as of January 1, 2018 by $19.1 million . See Note 5 for further details. In February 2016, FASB issued ASU No. 2016-2 which provided the principles for the recognition, measurement, presentation and disclosure of leases. Additional guidance and targeted improvements to Topic 842 were made through the issuance of supplementary ASUs in July 2018, December 2018 and March 2019. Effective January 1, 2019, we adopted the new lease accounting guidance in Topic 842. As the lessee and lessor, we have elected the package of practical expedients permitted in Topic 842. Accordingly, we have accounted for our existing operating leases as operating leases under the new guidance, without reassessing (a) whether the contract contains a lease under Topic 842, (b) whether classification of the operating lease would be different in accordance with Topic 842, or (c) whether the unamortized initial direct costs before transition adjustments (as of December 31, 2018) would have met the definition of initial direct costs in Topic 842 at lease commencement. Additionally, as the lessee and lessor we will use hindsight in determining the lease term and in assessing impairment of our right-of-use assets. As a result of the adoption of the new lease accounting guidance, as the lessee, we recognized on January 1, 2019 (a) a lease liability of approximately $1.1 million , which represents the present value of the remaining lease payments of approximately $1.2 million discounted using our incremental borrowing rate of 4.5% , and (b) a right-of-use asset of approximately $1.1 million . The adoption of Topic 842 did not have a material impact to our net income and related per share amounts. Upon adoption of Topic 842, lessees and lessors are required to apply a modified retrospective transition approach. Reporting entities are permitted to choose one of two methods to recognize and measure leases within the scope of Topic 842: • Apply Topic 842 to each lease that existed at the beginning of the earliest comparative period presented in the financial statements as well as leases that commenced after that date. Under this method, prior comparative periods presented are adjusted. For leases that commenced prior to the beginning of the earliest comparative period presented, a cumulative-effect adjustment is recognized at that date. • Apply the guidance to each lease that had commenced as of the beginning of the reporting period in which the entity first applies the lease standard with a cumulative-effect adjustment as of that date. Prior comparative periods would not be adjusted under this method. We have elected an optional transition method that allows entities to initially apply Topic 842 at January 1, 2019, the date of adoption, and to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. As the lessor, we have not assessed unamortized legal costs as part of the package of practical expedients, and we will not make any adjustment to retained earnings at the date of adoption to write off unamortized legal costs. We will continue to amortize unamortized legal costs as of December 31, 2018 over the life of the respective leases. We did not have a cumulative-effect adjustment as of the adoption date. Additionally, the optional transition method does allow us to not have to apply the new standard (including disclosure requirements) to comparative periods presented. Those periods can continue to be presented in accordance with prior generally accepted accounting principles. Topic 842 requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases and operating leases. Based on our election of the package of practical expedients, our existing commercial leases, where we are the lessor, continue to be accounted for as operating leases under the new standard. However, Topic 842 changed certain requirements regarding the classification of leases that could result in us recognizing certain long-term leases entered into or modified after January 1, 2019 as sales-type leases or finance leases, as opposed to operating leases. We will continue to monitor our leases following the adoption date to ensure that they are classified in accordance with the new lease standards. We elected a practical expedient which allows lessors to not separate non-lease components from the lease component when the timing and pattern of transfer for the lease components and non-lease components are the same and if the lease component is classified as an operating lease. As a result, we now present all rentals and reimbursements from tenants as a single line item, Rental , within the consolidated statements of operations and comprehensive income. We review the collectability of charges under our tenant operating leases on a regular basis, taking into consideration changes in factors such as the tenant’s payment history, the financial condition of the tenant, business conditions in the industry in which the tenant operates and economic conditions in the area where the property is located. Each tenant is included in one of several portfolios and an allowance is calculated using the calculation methodology for the respective portfolio. With the adoption of Topic 842, we will recognize an adjustment to rental revenue if we deem it probable that the receivable will not be collected. Prior to the adoption of Topic 842, we recognized an allowance for doubtful accounts and bad debt expense of the specific rents receivable. Our review of collectability under our operating leases includes any accrued rental revenues related to the straight-line method of reporting rental revenue. In November 2016, the FASB issued guidance requiring that the statement of cash flows explain the change during the period in the total cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance became effective for the reporting periods beginning on or after December 15, 2017, and interim periods within those fiscal years. We adopted this guidance effective January 1, 2018, and we have reconciled cash and cash equivalents and restricted cash and restricted cash equivalents on a retrospective basis, whereas under the previous guidance, we reported restricted cash and restricted cash equivalents under cash flows from financing activities. In January 2017, the FASB issued guidance clarifying the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or dispositions) of assets or businesses. This guidance became effective for the reporting periods beginning on or after December 15, 2017, and interim periods within those fiscal years. We adopted this guidance on a prospective basis beginning January 1, 2018 and believe the majority of our future acquisitions will qualify as asset acquisitions and the associated transaction costs will be capitalized as opposed to expensed under previous guidance. For the year ending December 31, 2019 , we capitalized $0.1 million in associated transaction costs. In February 2017, the FASB issued guidance clarifying the scope of asset derecognition guidance, adding guidance for partial sales of nonfinancial assets and clarifying recognizing gains and losses from the transfer of nonfinancial assets in contracts with noncustomers. This guidance became effective for the reporting periods beginning on or after December 15, 2017, and interim periods within those fiscal years. We adopted this guidance on a modified retrospective basis beginning January 1, 2018 and have derecognized the underlying assets and liabilities associated with the Contribution as of January 1, 2018 and have recognized the Company’s investment in Pillarstone OP under the equity method of accounting. The Company made an adjustment which decreased the Company’s accumulated deficit as of January 1, 2018 by $19.1 million . See Note 5 for further details.

Marketable Securities

Marketable Securities	12 Months Ended
	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	MARKETABLE SECURITIES In January 2018, we sold all of our remaining marketable securities and had no marketable securities as of December 31, 2019 . During the year ended December 31, 2018, available-for-sale securities were sold for total proceeds of $30,000 . The gross realized losses on these sales totaled $20,000 . For purposes of determining gross realized gains and losses, the cost of securities sold is based on specific identification.

Real Estate

Real Estate	12 Months Ended
	Dec. 31, 2019
Real Estate [Abstract]
Real Estate	REAL ESTATE As of December 31, 2019 , we owned 58 commercial properties in the Austin, Chicago, Dallas-Fort Worth, Houston, Phoenix and San Antonio areas comprised of approximately 5.0 million square feet of gross leasable area (“GLA”). Five of the 58 commercial properties are land parcels held for future development. Property Acquisitions. On December 6, 2019, we acquired Las Colinas Village, a property that meets our Community Centered Property ® strategy, for $34.8 million in cash and net prorations. Las Colinas Village, a 104,919 square foot property, was 86% leased at the time of purchase and is located in Irving, Texas. Revenue and net income attributable to Las Colinas of $0.3 million and $0.2 million , respectively, have been included in our results of operations for the year ended December 31, 2019 . On December 29, 2017, we acquired a 1.83 acre parcel of undeveloped land for $0.9 million in cash and net prorations. The undeveloped land parcel is the hard corner at our Eldorado Plaza property. On May 26, 2017, we acquired BLVD Place, a property that meets our Community Centered Property ® strategy, for $158.0 million , including $80.0 million of asset level mortgage financing and $78.0 million in cash and net prorations. BLVD Place, a 216,944 square foot property, was 99% leased at the time of purchase and is located in Houston, Texas. Included in the purchase of BLVD Place is approximately 1.43 acres of developable land. On May 3, 2017, we acquired Eldorado Plaza, a property that meets our Community Centered Property ® strategy, for $46.6 million in cash and net prorations. Eldorado Plaza, a 221,577 square foot property, was 96% leased at the time of purchase and is located in McKinney, Texas, a suburb of Dallas, Texas. Unaudited pro forma results of operations. The following unaudited pro forma results summarized below reflect our consolidated results of operations as if our acquisitions for the years ended December 31, 2019 , 2018 and 2017 were acquired on January 1, 2017 . The unaudited consolidated pro forma results of operations is not necessarily indicative of what the actual results of operations would have been, assuming the transactions had been completed as set forth above, nor do they purport to represent our results of operations for future periods. Year Ended December 31, (in thousands, except per share data) 2019 2018 2017 Total revenues $ 122,286 $ 123,243 $ 137,043 Net income $ 24,047 $ 21,876 $ 11,217 Net income attributable to Whitestone REIT (1) $ 23,502 $ 21,326 $ 10,888 Basic Earnings Per Share: $ 0.58 $ 0.54 $ 0.28 Diluted Earnings Per Share: $ 0.57 $ 0.52 $ 0.27 Weighted-average common shares outstanding: Basic (2) 40,184 39,274 37,933 Diluted (2) 41,462 40,612 38,760 (1) Net income attributable to Whitestone REIT reflects historical ownership percentages and does not reflect the effects of the April 2017 Offering (as defined in Note 14), assuming the sale of the common shares took place on January 1, 2017 , as the related impact on ownership percentage is minimal. (2) Pro forma weighted averages reflect the April 2017 Offering, assuming the sale of the common shares took place on January 1, 2017 . Acquisition costs. Acquisition-related costs of $0.1 million are capitalized in real estate assets in our balance sheets for the year ended December 31, 2019 . Acquisition-related costs of $0.0 million and $1.6 million are included in general and administrative expenses in our statements of operations and comprehensive income for the year ended December 31, 2018 and 2017 , respectively. Development properties. As of December 31, 2019 , we had substantially completed construction at our Anthem Marketplace Phase II property. As of December 31, 2019 , we had incurred approximately $1.4 million in construction costs. The 6,853 square foot Community Centered Property ® was 100% occupied as of December 31, 2019 and is located in Phoenix, Arizona, and adjacent to Anthem Marketplace. As of December 31, 2018, we had substantially completed construction at our Pinnacle of Scottsdale Phase II property. As of December 31, 2018, we had incurred approximately $5.5 million in construction costs, including approximately $0.6 million in previously capitalized interest and real estate taxes. The 27,063 square foot Community Centered Property ® was 100% leased at December 31, 2018 and is located in Scottsdale, Arizona, adjacent to Pinnacle of Scottsdale. As of December 31, 2018, we had substantially completed construction at our Shops at Starwood Phase III property. As of December 31, 2018, we had incurred approximately $8.4 million in construction costs, including approximately $1.1 million in previously capitalized interest and real estate taxes. The 35,351 square foot Community Centered Property ® was 72% leased at December 31, 2018 and is located in Frisco, Texas, a northern suburb of Dallas, Texas, adjacent to Shops at Starwood. Property dispositions. On September 24, 2018, we completed the sale of Torrey Square, located in Houston, Texas, for $8.7 million . We recorded a gain on sale of $4.4 million . We have not included Torrey Square in discontinued operations as it did not meet the definition of discontinued operations. On February 27, 2018, we completed the sale of Bellnott Square, located in Houston, Texas, for $4.7 million . We recorded a gain on sale of $0.3 million . We have not included Bellnott Square in discontinued operations as it did not meet the definition of discontinued operations. On November 15, 2019, we received a $0.8 million principal payment in connection with the sale of two retail buildings we completed on November 29, 2016. We recorded a gain on sale of $0.8 million . In 2016, we provided seller-financing for the retail buildings, Webster Pointe and Centre South, and deferred a $1.7 million gain until principal payments on the seller-financed loan are received. The purchaser of the retail buildings sold Webster Pointe on November 15, 2019 and paid the entire principal balance of the loan related to the property. We have not included the gain in discontinued operations as it did not meet the definition of discontinued operations at the date of the sale. On April 24, 2019, we received a $0.7 million principal payment in connection with the sale of three office buildings we completed on December 31, 2014. We recorded a gain on sale of $0.7 million . In 2014, we provided seller-financing for the office buildings, Zeta, Royal Crest and Featherwood, and deferred a $2.5 million gain until principal payments on the seller-financed loan are received. The purchaser of the office buildings sold Zeta on April 24, 2019 and paid the entire principal balance of the loan related to the property. We have included the gain in discontinued operations as it did meet the definition of discontinued operations at the date of sale. Hurricane Harvey. In August 2017, Hurricane Harvey impacted the South Texas region, including Houston, Texas. The majority of our Houston properties incurred minor damage and as a result, we recorded approximately $0.5 million in Harvey related repairs in property operation and maintenance expense for the year ended December 31, 2017.

Investment in Real Estate Partn

Investment in Real Estate Partnership	12 Months Ended
	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Investment in Real Estate Partnership	INVESTMENT IN REAL ESTATE PARTNERSHIP On December 8, 2016, we, through our Operating Partnership, entered into a Contribution Agreement (the “Contribution Agreement”) with Pillarstone OP and Pillarstone Capital REIT (“Pillarstone REIT”) pursuant to which we contributed all of the equity interests in four of our wholly-owned subsidiaries: Whitestone CP Woodland Ph. 2, LLC, a Delaware limited liability company (“CP Woodland”); Whitestone Industrial-Office, LLC, a Texas limited liability company (“Industrial-Office”); Whitestone Offices, LLC, a Texas limited liability company (“Whitestone Offices”); and Whitestone Uptown Tower, LLC, a Delaware limited liability company (“Uptown Tower,” and together with CP Woodland, Industrial-Office and Whitestone Offices, the “Entities”) that own 14 non-core properties that do not fit our Community Centered Property ® strategy (the “Pillarstone Properties”), to Pillarstone OP for aggregate consideration of approximately $84 million , consisting of (1) approximately $18.1 million of Class A units representing limited partnership interests in Pillarstone OP (“Pillarstone OP Units”), issued at a price of $1.331 per Pillarstone OP Unit; and (2) the assumption of approximately $65.9 million of liabilities, consisting of (a) approximately $15.5 million of our liability under the 2018 Facility (as defined in Note 9); (b) an approximately $16.3 million promissory note of Uptown Tower under the Loan Agreement, dated as of September 26, 2013, between Uptown Tower, as borrower, and U.S. Bank, National Association, as successor to Morgan Stanley Mortgage Capital Holdings LLC, as lender; and (c) an approximately $34.1 million promissory note (the “Industrial-Office Promissory Note”) of Industrial-Office issued under the Loan Agreement, dated as of November 26, 2013 (the “Industrial-Office Loan Agreement”), between Industrial-Office, as borrower, and Jackson National Life Insurance Company, as lender (collectively, the “Contribution”). In connection with the Contribution, (1) with respect to each Pillarstone Property (other than Uptown Tower), Whitestone TRS, Inc., a subsidiary of the Company (“Whitestone TRS”), entered into a Management Agreement with the Entity that owns such Pillarstone Property and (2) with respect to Uptown Tower, Whitestone TRS entered into a Management Agreement with Pillarstone OP (collectively, the “Management Agreements”). Pursuant to the Management Agreements with respect to each Pillarstone Property (other than Uptown Tower), Whitestone TRS agreed to provide certain property management, leasing and day-to-day advisory and administrative services to such Pillarstone Property in exchange for (x) a monthly property management fee equal to 5.0% of the monthly revenues of such Pillarstone Property and (y) a monthly asset management fee equal to 0.125% of GAV (as defined in each Management Agreement as, generally, the purchase price of the respective Pillarstone Property based upon the purchase price allocations determined pursuant to the Contribution Agreement, excluding all indebtedness, liabilities or claims of any nature) of such Pillarstone Property. Pursuant to the Management Agreement with respect to Uptown Tower, Whitestone TRS agreed to provide certain property management, leasing and day-to-day advisory and administrative services to Pillarstone OP in exchange for (x) a monthly property management fee equal to 3.0% of the monthly revenues of Uptown Tower and (y) a monthly asset management fee equal to 0.125% of GAV of Uptown Tower. The initial term of each Management Agreement expired on December 31, 2017, after which each Management Agreement became automatically renewable on a month to month basis; provided that each Management Agreement can be terminated by either party thereto upon not less than thirty days’ prior written notice to the other party. None of the Management Agreements had been terminated as of December 31, 2019 . In connection with the Contribution, on December 8, 2016, the Operating Partnership entered into a Tax Protection Agreement with Pillarstone REIT and Pillarstone OP pursuant to which Pillarstone OP agreed to indemnify the Operating Partnership for certain tax liabilities resulting from its recognition of income or gain prior to December 8, 2021 if such liabilities result from a transaction involving a direct or indirect taxable disposition of all or a portion of the Pillarstone Properties or if Pillarstone OP fails to maintain and allocate to the Operating Partnership for taxation purposes minimum levels of liabilities as specified in the Tax Protection Agreement, the result of which causes such recognition of income or gain and the Company incurs taxes that must be paid to maintain its REIT status for federal income tax purposes. As of December 31, 2019 , we owned approximately 81.4% of the total outstanding units of Pillarstone OP. Additionally, certain of our officers and trustees serve as officers and trustees of Pillarstone REIT. In connection with the Contribution, in December 2016, we determined that we were the primary beneficiary of Pillarstone OP, through our power to direct the activities of Pillarstone OP, additional working capital required by Pillarstone OP under an OP Unit purchase agreement and our obligation to absorb losses and receive benefits based on our ownership percentage. Accordingly, we accounted for Pillarstone OP as a VIE and fully consolidated it in our consolidated financial statements for the year ended December 31, 2016 and in the subsequent periods. In November 2017, we received a comment letter from the Staff of the Division of Corporation Finance of the SEC (the “Staff”) relating to our Annual Report on Form 10-K for the year ended December 31, 2016. In their letter, the Staff requested that we provide them with an analysis to support our determination that Pillarstone OP is a VIE of which we are the primary beneficiary and that Pillarstone OP should be consolidated in our financial statements in accordance with GAAP. In response to the Staff’s comment, we provided the Staff with our analysis of our accounting and financial reporting obligations relating to our interest in Pillarstone OP. After communicating our analysis and conclusions to the Staff and responding to additional questions from the Staff relating to this matter, the Staff did not object to or otherwise take exception to our initial determinations at the time of the consummation of the Contribution in December 2016 but provided a verbal reminder that the determination of the primary beneficiary of a VIE should be continually reassessed, noting that the initial terms of the Management Agreements expired in December 2017, and suggesting that we consider pre-clearing future accounting treatment of Pillarstone OP with the Staff of the Office of the Chief Accountant (“OCA”). In connection with the preparation and review of the Company’s financial statements for the quarter ended March 31, 2018, the Company concluded, after consultation with the Company’s outside advisors, that it would be prudent to seek the pre-clearance from the Staff of the SEC’s Office of the Chief Accountant (“OCA”) of the proposed treatment of Pillarstone OP in the Company’s financial statements for such quarter. Accordingly, in April 2018, the Company submitted a letter to the OCA seeking their concurrence with the Company’s determinations that it maintained its status as the primary beneficiary of Pillarstone OP and, accordingly, should continue to consolidate Pillarstone OP in its financial statements for the quarter ended March 31, 2018 in accordance with GAAP. After further correspondence, including telephonic meetings between the Company, its advisors and the OCA, the OCA informed the Company that it objected to the conclusions that the Company was the primary beneficiary of Pillarstone OP and was required to consolidate it in the Company’s financial statements since the Contribution in December 2016 and during the subsequent periods. After consideration of the OCA’s objection to the Company’s original accounting, the Company determined that the correct accounting treatment was to apply certain industry specific accounting guidance applicable to real estate transactions, ASC 360-20, the profit sharing method, which required the Company to continue to recognize the underlying assets and liabilities associated with the Contribution in the Company’s financial statements, and revised its accounting treatment accordingly. Management evaluated the quantitative and qualitative materiality of the errors and concluded that the difference between applying ASC 360-20 and the consolidation of Pillarstone OP under the VIE guidance was not material to the financial statements of any period presented through December 31, 2017. As a result, the Company elected to correct them in future financial statements, beginning with the consolidated financial statements as and for the period ended June 30, 2018 and in the accompanying prior period consolidated financial statements included in the Company’s Quarterly Report on Form 10-Q for the period ended June 30, 2018. On January 1, 2018, the Company adopted ASU 2014-09 (“Topic 606”), as subsequently amended, using the modified retrospective method and applied Topic 606 to those contracts that were not completed as of January 1, 2018. Topic 606 added a new section, ASC 610, “ Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets ,” which effectively superseded industry specific accounting guidance applicable to real estate transactions. As a result of the adoption of Topic 606 and ASC 610, the Company derecognized the underlying assets and liabilities associated with the Contribution as of January 1, 2018 and recognized the Company’s investment in Pillarstone OP under the equity method for the periods after December 31, 2017. The table below presents the real estate partnership investment in which the Company held an ownership interest (in thousands): The Company’s Investment as of December 31, 2019 2018 Real estate partnership Ownership Interest Pillarstone OP (1)(2) 81.4% $ 34,097 $ 26,236 Total real estate partnership (3) $ 34,097 $ 26,236 (1) The Company manages these real estate partnership investments and, where applicable, earns acquisition fees, leasing commissions, property management fees, and asset management fees. (2) As of December 31, 2017, the Company had a net deferred gain of $18.0 million relating to the sale of properties to Pillarstone OP prior to the adoption of ASU 2017-05. These deferred gains were included in the Company’s investment above. Upon adoption, the Company recorded a cumulative-effect adjustment of $19.1 million to its beginning accumulated deficit as of January 1, 2018 on the Company’s Consolidated Statements of Changes in Equity. (3) Representing eight property interests and 0.9 million square feet of GLA, as of December 31, 2019 , and 11 property interests and 1.3 million square feet of GLA, as of December 31, 2018 . On October 8, 2019, Pillarstone OP, through an indirect wholly owned subsidiary, Whitestone Industrial-Office, LLC, sold a portfolio of three properties in Houston, Texas to an unaffiliated third party for $39.7 million in cash. Pillarstone OP used the net proceeds to make a large distribution to Whitestone of $5.4 million after customary closing deductions, to pay off mortgage debt on the three properties, and pay off the remaining $5.7 million of its $15.5 million loan from Whitestone. Included in 2019 equity in earnings from real estate partnership is a $13.8 million gain related to this sale. On December 27, 2018, Pillarstone OP, through an indirect wholly owned subsidiary, Whitestone Industrial-Office, LLC, sold a portfolio of three properties in Houston, Texas to an unaffiliated third party for $15.8 million in cash. Pillarstone OP used the net proceeds, after customary closing deductions, to pay off mortgage debt on the three properties, and repay $8.0 million of its $14.5 million loan from Whitestone. Included in 2018 equity in earnings from real estate partnership is a $6.3 million gain related to this sale. The table below presents the Company’s share of net income from its investment in the real estate partnership which is included in equity in earnings of real estate partnership, net on the Company’s Consolidated Statements of Operations and Comprehensive Income (in thousands): Year Ended December 31, 2019 2018 Pillarstone OP $ 15,076 $ 8,431 Summarized financial information for the Company’s investment in real estate partnership is as follows (in thousands): Year Ended December 31, 2019 2018 Assets: Real estate, net $ 50,338 $ 72,661 Other assets 6,742 6,617 Total assets 57,080 79,278 Liabilities and equity: Notes payable 15,434 47,064 Other liabilities 3,575 4,322 Equity 38,071 27,892 Total liabilities and equity 57,080 79,278 Company’s share of equity 31,008 22,717 Cost of investment in excess of the Company’s share of underlying net book value 3,089 3,519 Carrying value of investment in real estate partnership $ 34,097 $ 26,236 Year Ended December 31, 2019 2018 Rental revenues $ 14,253 $ 17,180 Property expenses (9,045 ) (6,687 ) Other expenses (3,449 ) (7,848 ) Gain on sale of properties or disposal of assets 16,943 7,839 Net income $ 18,702 $ 10,484 The amortization of the basis difference between the cost of investment and the Company's share of underling net book value for both years ended December 31, 2019 and 2018 was $108,000 . The Company amortized the difference into equity in earnings of real estate partnership on the consolidated statements of operations and comprehensive income statement. As a result of the adoption of Topic 606 and ASC 610, the Company recognized the Company’s investment in Pillarstone OP under the equity method for the years ended December 31, 2019 and 2018 . For the year ended December 31, 2017, Pillarstone OP was accounted for using the profit-sharing method. The carrying amounts and classification of certain assets and liabilities for Pillarstone OP under the profit sharing method as of December 31, 2017 and consisted of the following (in thousands): Real estate assets, at cost Property $ 95,146 Accumulated depreciation (35,980 ) Total real estate assets 59,166 Investment in real estate partnership 4,095 Liabilities Notes payable (1) (48,840 ) Net carrying value $ 14,421 (1) Excludes approximately $15.5 million in notes payable due to Whitestone as of December 31, 2017. The Company's maximum exposure to loss relating to Pillarstone OP is limited to its investment in Pillarstone OP and its guarantee of promissory notes issued to Pillarstone OP. Since the date of the Contribution, the Company has not provided financial support to Pillarstone OP that it was not previously contractually required to provide under the Management Agreements. The Company's maximum exposure to loss relating to Pillarstone OP as of December 31, 2017 was as follows (in thousands): Net carrying value $ 14,421 OP Unit Purchase Agreement 3,000 Notes payable 48,840 Maximum exposure to loss $ 66,261 The Company has evaluated its guarantee to Pillarstone OP pursuant to ASC 460, Guarantees , and has determined the guarantee to be a performance guarantee, for which ASC 460 contains initial recognition and measurement requirements, and related disclosure requirements. The Company is obligated in two respects: (i) a noncontingent liability, which represents the Company’s obligation to stand ready to perform under the terms of the guarantee in the event that the specified triggering event(s) occur; and (ii) the contingent liability, which represents the Company’s obligation to make future payments if those triggering events occur. The Company recognized a noncontingent liability of $462,000 at the inception of the guarantee at fair value and is recorded on the the Company’s consolidated balance sheet as a liability. The Company amortizes the guarantee liability into income over seven years . For the years ended December 31, 2019 , 2018 , and 2017 , the amortization of the guarantee liability were $182,000 , $106,000 , and $112,000 , respectively.

Accrued Rents and Accounts Rece

Accrued Rents and Accounts Receivable, Net	12 Months Ended
	Dec. 31, 2019
Receivables [Abstract]
Accrued Rents and Accounts Receivable, Net	ACCRUED RENTS AND ACCOUNTS RECEIVABLE, NET Accrued rents and accounts receivable, net, consists of amounts accrued, billed and due from tenants, allowance for doubtful accounts and other receivables as follows (in thousands): December 31, 2019 2018 Tenant receivables $ 16,741 $ 14,686 Accrued rents and other recoveries 16,983 16,423 Allowance for doubtful accounts (11,173 ) (9,746 ) Other receivables 303 279 Totals $ 22,854 $ 21,642

Unamortized Lease Commissions,

Unamortized Lease Commissions, Legal Fees and Loan Costs	12 Months Ended
	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Unamortized Lease Commissions, Legal Fees and Loan Costs	UNAMORTIZED LEASE COMMISSIONS, LEGAL FEES AND LOAN COSTS Costs which have been deferred consist of the following (in thousands): December 31, 2019 2018 Leasing commissions $ 9,868 $ 8,789 Deferred legal cost 393 406 Deferred financing cost 3,908 4,076 Total cost 14,169 13,271 Less: leasing commissions accumulated amortization (4,200 ) (3,534 ) Less: deferred legal cost accumulated amortization (179 ) (125 ) Less: deferred financing cost accumulated amortization (830 ) (2,914 ) Total cost, net of accumulated amortization $ 8,960 $ 6,698 A summary of expected future amortization of deferred costs is as follows (in thousands): Years Ended December 31, Leasing Commissions Deferred Legal Costs Deferred Financing Costs Total 2020 $ 1,593 $ 59 $ 900 $ 2,552 2021 1,365 45 900 2,310 2022 1,117 35 839 1,991 2023 853 22 220 1,095 2024 612 20 192 824 Thereafter 128 33 27 188 Total $ 5,668 $ 214 $ 3,078 $ 8,960

Leases

Leases	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Leases	future rents to be received (exclusive of renewals, tenant reimbursements, and contingent rents) under noncancelable operating leases in existence as of December 31, 2018 is as follows (in thousands): Years Ended December 31, Minimum Future Rents 2019 $ 81,149 2020 70,181 2021 59,550 2022 48,431 2023 37,327 Thereafter 122,102 Total $ 418,740 Prior to the adoption of Topic 842, as of December 31, 2018, we had the following lease obligations (in thousands): Payment due by period Lease Obligations Total Less than 1 1 - 3 years 3 - 5 years More than Operating Lease Obligations 185 85 100 — — Related Party Rent Lease Obligations 963 441 522 — — Total $ 1,148 $ 526 $ 622 $ — $ —

Debt

Debt	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Debt	DEBT Mortgages and other notes payable consist of the following (in thousands): December 31, Description 2019 2018 Fixed rate notes $10.5 million, 4.85% Note, due September 24, 2020 (1) $ 9,260 $ 9,500 $50.0 million, 1.75% plus 1.35% to 1.90% Note, due October 30, 2020 (2) — 50,000 $50.0 million, 1.50% plus 1.35% to 1.90% Note, due January 29, 2021 (3) — 50,000 $100.0 million, 1.73% plus 1.35% to 1.90% Note, due October 30, 2022 (4) 100,000 100,000 $165.0 million, 2.24% plus 1.35% to 1.90% Note, due January 31, 2024 (5) 165,000 — $80.0 million, 3.72% Note, due June 1, 2027 80,000 80,000 $6.5 million 3.80% Note, due January 1, 2019 — 5,657 $19.0 million 4.15% Note, due December 1, 2024 19,000 19,000 $20.2 million 4.28% Note, due June 6, 2023 18,616 18,996 $14.0 million 4.34% Note, due September 11, 2024 13,482 13,718 $14.3 million 4.34% Note, due September 11, 2024 14,243 14,300 $15.1 million 4.99% Note, due January 6, 2024 14,409 14,643 $2.6 million 5.46% Note, due October 1, 2023 2,386 2,430 $50.0 million, 5.09% Note, due March 22, 2029 50,000 — $50.0 million, 5.17% Note, due March 22, 2029 50,000 — Floating rate notes Unsecured line of credit, LIBOR plus 1.40% to 1.90%, due January 31, 2023 (6) 109,500 241,200 Total notes payable principal 645,896 619,444 Less deferred financing costs, net of accumulated amortization (1,197 ) (1,239 ) $ 644,699 $ 618,205 (1) Promissory note includes an interest rate swap that fixed the interest rate at 3.55% for the duration of the term through September 24, 2018 and 4.85% beginning September 25, 2018 through September 24, 2020. (2) Promissory note includes an interest rate swap that fixed the LIBOR portion of Term Loan 1 (as defined below) at 0.84% through February 3, 2017 and 1.75% beginning February 4, 2017 through October 30, 2020. (3) Promissory note includes an interest rate swap that fixed the LIBOR portion of Term Loan 2 (as defined below) at 1.50% . (4) Promissory note includes an interest rate swap that fixed the LIBOR portion of Term Loan 3 (as defined below) at 1.73% . (5) Promissory note includes an interest rate swap that fixed the LIBOR portion of the interest rate at an average rate of 2.24% for the duration of the term through January 31, 2024. (6) Unsecured line of credit includes certain Pillarstone Properties as of December 31, 2018, in determining the amount of credit available under the 2018 Facility which were released from collateral during 2019. LIBOR is expected to be discontinued after 2021. A number of our current debt agreements have an interest rate tied to LIBOR. Some of these agreements provide procedures for determining an alternative base rate in the event that LIBOR is discontinued, but not all do so. Regardless, there can be no assurances as to what alternative base rates may be and whether such base rate will be more or less favorable than LIBOR and any other unforeseen impacts of the potential discontinuation of LIBOR. The Company intends to monitor the developments with respect to the potential phasing out of LIBOR after 2021 and work with its lenders to ensure any transition away from LIBOR will have minimal impact on its financial condition, but can provide no assurances regarding the impact of the discontinuation of LIBOR. On March 22, 2019, we, through our Operating Partnership, entered into a Note Purchase and Guarantee Agreement (the “Note Agreement”) together with certain subsidiary guarantors as initial guarantor parties thereto (the “Subsidiary Guarantors”) and The Prudential Insurance Company of America and the various other purchasers named therein (collectively, the “Purchasers”) providing for the issuance and sale of $100 million of senior unsecured notes of the Operating Partnership, of which (i) $50 million are designated as 5.09% Series A Senior Notes due March 22, 2029 (the “Series A Notes”) and (ii) $50 million are designated as 5.17% Series B Senior Notes due March 22, 2029 (the “Series B Notes” and, together with the Series A Notes, the “Notes”) pursuant to a private placement that closed on March 22, 2019 (the “Private Placement”). Obligations under the Notes are unconditionally guaranteed by the Company and by the Subsidiary Guarantors. The principal of the Series A Notes will begin to amortize on March 22, 2023 with annual principal payments of approximately $7.1 million . The principal of the Series B Notes will begin to amortize on March 22, 2025 with annual principal payments of $10.0 million . The Notes will pay interest quarterly on the 22nd day of March, June, September and December in each year until maturity. The Operating Partnership may prepay at any time all, or from time to time part of, the Notes, in an amount not less than $1,000,000 in the case of a partial prepayment, at 100% of the principal amount so prepaid, plus a make-whole amount. The make-whole amount is equal to the excess, if any, of the discounted value of the remaining scheduled payments with respect to the Notes being prepaid over the aggregate principal amount of such Notes (as described in the Note Agreement). In addition, in connection with a Change of Control (as defined in the Note Purchase Agreement), the Operating Partnership is required to offer to prepay the Notes at 100% of the principal amount plus accrued and unpaid interest thereon. The Note Agreement contains representations, warranties, covenants, terms and conditions customary for transactions of this type and substantially similar to the Operating Partnership’s existing senior revolving credit facility, including limitations on liens, incurrence of investments, acquisitions, loans and advances and restrictions on dividends and certain other restricted payments. In addition, the Note Agreement contains certain financial covenants substantially similar to the Operating Partnership’s existing senior revolving credit facility, including the following: • maximum total indebtedness to total asset value ratio of 0.60 to 1.00; • maximum secured debt to total asset value ratio of 0.40 to 1.00; • minimum EBITDA (earnings before interest, taxes, depreciation, amortization or extraordinary items) to fixed charges ratio of 1.50 to 1.00; • maximum other recourse debt to total asset value ratio of 0.15 to 1.00; and • maintenance of a minimum tangible net worth (adjusted for accumulated depreciation and amortization) of $372 million plus 75% of the net proceeds from additional equity offerings (as defined therein). In addition, the Note Agreement contains a financial covenant requiring that maximum unsecured debt not exceed the lesser of (i) an amount equal to 60% of the aggregate unencumbered asset value and (ii) the debt service coverage amount (as described in the Note Agreement). That covenant is substantially similar to the borrowing base concept contained in the Operating Partnership’s existing senior revolving credit facility. The Note Agreement also contains default provisions, including defaults for non-payment, breach of representations and warranties, insolvency, non-performance of covenants, cross-defaults with other indebtedness and guarantor defaults. The occurrence of an event of default under the Note Agreement could result in the Purchasers accelerating the payment of all obligations under the Notes. The financial and restrictive covenants and default provisions in the Note Agreement are substantially similar to those contained in the Operating Partnership’s existing credit facility. Net proceeds from the Private Placement were used to refinance existing indebtedness. The Notes have not been and will not be registered under the Securities Act of 1933, as amended (the “Securities Act”), and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act. The Notes were sold in reliance on the exemption from registration provided by Section 4(a)(2) of the Securities Act. On January 31, 2019, we, through our Operating Partnership, entered into an unsecured credit facility (the “2019 Facility”) with the lenders party thereto, Bank of Montreal, as administrative agent (the “Agent”), SunTrust Robinson Humphrey, as syndication agent, and BMO Capital Markets Corp., U.S. Bank National Association, SunTrust Robinson Humphrey and Regions Capital Markets, as co-lead arrangers and joint book runners. The 2019 Facility amended and restated the 2018 Facility (as defined below). The 2019 Facility is comprised of the following three tranches: • $250.0 million unsecured revolving credit facility with a maturity date of January 1, 2023 (the “2019 Revolver”); • $165.0 million unsecured term loan with a maturity date of January 31, 2024 (“Term Loan A”); and • $100.0 million unsecured term loan with a maturity date of October 30, 2022 (“Term Loan B” and together with Term Loan A, the “2019 Term Loans”). Borrowings under the 2019 Facility accrue interest (at the Operating Partnership's option) at a Base Rate or an Adjusted LIBOR plus an applicable margin based upon our then existing leverage. As of December 31, 2019 , the interest rate on the 2019 Revolver was 3.35% . The applicable margin for Adjusted LIBOR borrowings ranges from 1.40% to 1.90% for the 2019 Revolver and 1.35% to 1.90% for the 2019 Term Loans. Base Rate means the higher of: (a) the Agent’s prime commercial rate, (b) the sum of (i) the average rate quoted by the Agent by two or more federal funds brokers selected by the Agent for sale to the Agent at face value of federal funds in the secondary market in an amount equal or comparable to the principal amount for which such rate is being determined, plus (ii) 1/2 of 1.00% , and (c) the LIBOR rate for such day plus 1.00% . Adjusted LIBOR means LIBOR divided by one minus the Eurodollar Reserve Percentage. The Eurodollar Reserve Percentage means the maximum reserve percentage at which reserves are imposed by the Board of Governors of the Federal Reserve System on eurocurrency liabilities. Pursuant to the 2019 Facility, in the event of certain circumstances that result in the unavailability of LIBOR, including but not limited to LIBOR no longer being a widely recognized benchmark rate for newly originated dollar loans in the U.S. market, the Operating Partnership and the Agent will establish an alternate interest rate to LIBOR giving due consideration to prevailing market conventions and will amend the 2019 Facility to give effect to such alternate interest rate. The 2019 Facility includes an accordion feature that will allow the Operating Partnership to increase the borrowing capacity by $200.0 million , upon the satisfaction of certain conditions. As of December 31, 2019 , $374.5 million was drawn on the 2019 Facility and our unused borrowing capacity was $140.5 million , assuming that we use the proceeds of the 2019 Facility to acquire properties, or to repay debt on properties, that are eligible to be included in the unsecured borrowing base. The Company used $446.2 million of proceeds from the 2019 Facility to repay amounts outstanding under the 2018 Facility and intends to use the remaining proceeds from the 2019 Facility for general corporate purposes, including property acquisitions, debt repayment, capital expenditures, the expansion, redevelopment and re-tenanting of properties in its portfolio and working capital. The Company, each direct and indirect material subsidiary of the Operating Partnership and any other subsidiary of the Operating Partnership that is a guarantor under any unsecured ratable debt will serve as a guarantor for funds borrowed by the Operating Partnership under the 2019 Facility. The 2019 Facility contains customary terms and conditions, including, without limitation, customary representations and warranties and affirmative and negative covenants including, without limitation, information reporting requirements, limitations on investments, acquisitions, loans and advances, mergers, consolidations and sales, incurrence of liens, dividends and restricted payments. In addition, the 2019 Facility contains certain financial covenants including the following: • maximum total indebtedness to total asset value ratio of 0.60 to 1.00; • maximum secured debt to total asset value ratio of 0.40 to 1.00; • minimum EBITDA (earnings before interest, taxes, depreciation, amortization or extraordinary items) to fixed charges ratio of 1.50 to 1.00; • maximum other recourse debt to total asset value ratio of 0.15 to 1.00; and • maintenance of a minimum tangible net worth (adjusted for accumulated depreciation and amortization) of $372 million plus 75% of the net proceeds from additional equity offerings (as defined therein). We serve as the guarantor for funds borrowed by the Operating Partnership under the 2019 Facility. The 2019 Facility contains customary terms and conditions, including, without limitation, affirmative and negative covenants such as information reporting requirements, maximum secured indebtedness to total asset value, minimum EBITDA (earnings before interest, taxes, depreciation, amortization or extraordinary items) to fixed charges, and maintenance of a minimum net worth. The 2019 Facility also contains customary events of default with customary notice and cure, including, without limitation, nonpayment, breach of covenant, misrepresentation of representations and warranties in a material respect, cross-default to other major indebtedness, change of control, bankruptcy and loss of REIT tax status. On November 7, 2014, we, through our Operating Partnership, entered into an unsecured revolving credit facility (the “2014 Facility”) with the lenders party thereto, with BMO Capital Markets Corp., Wells Fargo Securities, LLC, Merrill Lynch, Pierce, Fenner & Smith Incorporated and U.S. Bank, National Association, as co-lead arrangers and joint book runners, and Bank of Montreal, as administrative agent (the “Agent”). The 2014 Facility amended and restated our previous unsecured revolving credit facility. On October 30, 2015, we, through our Operating Partnership, entered into the First Amendment to the 2014 Facility (the “First Amendment”) with the guarantors party thereto, the lenders party thereto and the Agent. We refer to the 2014 Facility, as amended by the First Amendment, as the “2018 Facility.” Pursuant to the First Amendment, the Company made the following amendments to the 2014 Facility: • extended the maturity date of the $300 million unsecured revolving credit facility under the 2014 Facility (the “2018 Revolver”) to October 30, 2019 from November 7, 2018; • converted $100 million of outstanding borrowings under the Revolver to a new $100 million unsecured term loan under the 2014 Facility (“Term Loan 3”) with a maturity date of October 30, 2022; • extended the maturity date of the first $50 million unsecured term loan under the 2014 Facility (“Term Loan 1”) to October 30, 2020 from February 17, 2017; and • extended the maturity date of the second $50 million unsecured term loan under the 2014 Facility (“Term Loan 2” and together with Term Loan 1 and Term Loan 3, the “2018 Term Loans”) to January 29, 2021 from November 7, 2019. Borrowings under the 2018 Facility accrued interest (at the Operating Partnership's option) at a Base Rate or an Adjusted LIBOR plus an applicable margin based upon our then existing leverage. The applicable margin for Adjusted LIBOR borrowings ranged from 1.40% to 1.95% for the 2018 Revolver and 1.35% to 2.25% for the 2018 Term Loans. Base Rate means the higher of: (a) the Agent’s prime commercial rate, (b) the sum of (i) the average rate quoted by the Agent by two or more federal funds brokers selected by the Agent for sale to the Agent at face value of federal funds in the secondary market in an amount equal or comparable to the principal amount for which such rate is being determined, plus (ii) 1/2 of 1.00% , and (c) the LIBOR rate for such day plus 1.00% . Adjusted LIBOR means LIBOR divided by one minus the Eurodollar Reserve Percentage. The Eurodollar Reserve Percentage means the maximum reserve percentage at which reserves are imposed by the Board of Governors of the Federal Reserve System on eurocurrency liabilities. Proceeds from the 2018 Facility were used for general corporate purposes, including property acquisitions, debt repayment, capital expenditures, the expansion, redevelopment and re-tenanting of properties in our portfolio and working capital. On May 26, 2017, we, through our subsidiary, Whitestone BLVD Place LLC, a Delaware limited liability company, issued a $80.0 million promissory note to American General Life Insurance Company (the “BLVD Note”). The BLVD Note has a fixed interest rate of 3.72% and a maturity date of June 1, 2027. Proceeds from the BLVD Note were used to fund a portion of the purchase price of the acquisition of BLVD Place. As of December 31, 2019 , our $171.4 million in secured debt was collateralized by eight properties with a carrying value of $270.4 million . Our loans contain restrictions that would require the payment of prepayment penalties for the acceleration of outstanding debt and are secured by deeds of trust on certain of our properties and by assignment of the rents and leases associated with those properties. In 2018, we were not in compliance with respect to the tangible Net Worth covenant as defined in the 2018 Facility and had received two waivers in 2018. Had we been unable to obtain a waiver or other suitable relief from the lenders under the 2018 Facility, an Event of Default (as defined in the 2018 Facility) would have occurred, permitting the lenders holding a majority of the commitments under the 2018 Facility to, among other things, accelerate the outstanding indebtedness, which would make it immediately due and payable. The 2019 Facility and the Notes contain a similar tangible Net Worth covenant that resets at a new threshold and changes the definition of Net Worth to add back accumulated depreciation. However, we can make no assurances that we will be in compliance with these covenants or other covenants under the 2019 Facility or the Notes in future periods or, if we are not in compliance, that we will be able to obtain a waiver. As of December 31, 2019 , we were in compliance with all loan covenants. Scheduled maturities of our outstanding debt as of December 31, 2019 were as follows (in thousands): Year Amount Due 2020 $ 10,951 2021 1,611 2022 101,683 2023 137,363 2024 228,573 Thereafter 165,715 Total $ 645,896 As of December 31, 2019 , we had the following contractual obligations (in thousands): Payment due by period (in thousands) Consolidated Contractual Obligations Total Less than 1 1 - 3 years 3 - 5 years More than Long-Term Debt - Principal $ 645,896 $ 10,951 $ 103,294 $ 365,936 $ 165,715 Long-Term Debt - Fixed Interest 107,674 21,742 41,975 26,746 17,211 Long-Term Debt - Variable Interest (1) 13,633 4,544 9,089 — — Unsecured credit facility - Unused commitment fee (2) 1,077 351 702 24 — Operating Lease Obligations 212 126 82 4 — Related Party Rent Lease Obligations 1,170 790 380 — — Total $ 769,662 $ 38,504 $ 155,522 $ 392,710 $ 182,926 (1) As of December 31, 2019 , we had one loan totaling $109.5 million which bore interest at a floating rate. The variable interest rate payments are based on LIBOR plus 1.40% to LIBOR plus 1.90% , which reflects our new interest rates under the 2019 Facility. The information in the table above reflects our projected interest rate obligations for the floating rate payments based on one-month LIBOR as of December 31, 2019 , of 1.76% . (2) The unused commitment fees on the 2019 Facility, payable quarterly, are based on the average daily unused amount of the 2019 Facility. The fees are 0.20% for facility usage greater than 50% or 0.25% for facility usage less than 50% . The information in the table above reflects our projected obligations for the 2019 Facility based on our December 31, 2019 balance of $374.5 million .

Derivatives and Hedging Activit

Derivatives and Hedging Activities (Notes)	12 Months Ended
	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	DERIVATIVES AND HEDGING ACTIVITIES The estimated fair value of our interest rate swaps is as follows (in thousands): December 31, 2019 Balance Sheet Location Estimated Fair Value Prepaid expenses and other assets $ 59 Accounts payable and accrued expenses $ (5,660 ) December 31, 2018 Balance Sheet Location Estimated Fair Value Prepaid expenses and other assets $ 4,286 Accounts payable and accrued expenses $ (59 ) On January 31, 2019, we, through our Operating Partnership, entered into an interest rate swap of $65 million with Bank of Montreal that fixed the LIBOR portion of Term Loan A under the 2019 Facility at 2.43% . Pursuant to the terms of the agreement governing the interest rate swap, Bank of Montreal assigned $12.9 million of the swap to U.S. Bank, National Association, $11.6 million of the swap to Regions Bank, $15.7 million of the swap to SunTrust Bank, and $5.9 million of the swap to Associated Bank. See Note 9 (Debt) for additional information regarding the 2019 Facility. The swap began on February 7, 2019 and will mature on November 9, 2020. We have designated the interest rate swap as a cash flow hedge with the effective portion of the changes in fair value to be recorded in comprehensive income and subsequently reclassified into earnings in the period that the hedged transaction affects earnings. The ineffective portion of the change in fair value, if any, will be recognized directly in earnings. The Company does not expect any amount of the existing gains or losses to be reclassified into earnings within the next 12 months. On January 31, 2019, we, through our Operating Partnership, entered into an interest rate swap of $115 million with Bank of Montreal that fixed the LIBOR portion of Term Loan A under the 2019 Facility at 2.43% . Pursuant to the terms of the agreement governing the interest rate swap, Bank of Montreal assigned $22.7 million of the swap to U.S. Bank, National Association, $20.5 million of the swap to Regions Bank, $27.9 million of the swap to SunTrust Bank, and $10.5 million of the swap to Associated Bank. See Note 9 (Debt) for additional information regarding the 2019 Facility. The swap will begin on November 9, 2020 and will mature on February 8, 2021. We have designated the interest rate swap as a cash flow hedge with the effective portion of the changes in fair value to be recorded in comprehensive income and subsequently reclassified into earnings in the period that the hedged transaction affects earnings. The ineffective portion of the change in fair value, if any, will be recognized directly in earnings. The Company does not expect any amount of the existing gains or losses to be reclassified into earnings within the next 12 months. On January 31, 2019, we, through our Operating Partnership, entered into an interest rate swap of $165 million with Bank of Montreal that fixed the LIBOR portion of Term Loan A under the 2019 Facility at 2.43% . Pursuant to the terms of the agreement governing the interest rate swap, Bank of Montreal assigned $32.6 million of the swap to U.S. Bank, National Association, $29.4 million of the swap to Regions Bank, $40.0 million of the swap to SunTrust Bank, and $15.0 million of the swap to Associated Bank. See Note 9 (Debt) for additional information regarding the 2019 Facility. The swap will begin on February 8, 2021 and will mature on January 31, 2024. We have designated the interest rate swap as a cash flow hedge with the effective portion of the changes in fair value to be recorded in comprehensive income and subsequently reclassified into earnings in the period that the hedged transaction affects earnings. The ineffective portion of the change in fair value, if any, will be recognized directly in earnings. The Company does not expect any amount of the existing gains or losses to be reclassified into earnings within the next 12 months. On September 5, 2018, we, through our Operating Partnership, entered into an interest rate swap with Bank of America that fixed the LIBOR portion of the $9.6 million extension loan on the Whitestone Terravita Marketplace property at 2.85% . The swap began on September 25, 2018 and will mature on September 24, 2020. We have designated the interest rate swap as a cash flow hedge with the effective portion of the changes in fair value to be recorded in comprehensive income and subsequently reclassified into earnings in the period that the hedged transaction affects earnings. The ineffective portion of the change in fair value, if any, will be recognized directly in earnings. The Company does not expect any amount of the existing gains or losses to be reclassified into earnings within the next 12 months. On November 19, 2015, we, through our Operating Partnership, entered into an interest rate swap with Bank of Montreal that fixed the LIBOR portion of Term Loan 3 under the 2018 Facility at 1.73% . In the fourth quarter of 2015, pursuant to the terms of the agreement governing the interest rate swap, Bank of Montreal assigned $35.0 million of the swap to U.S. Bank, National Association, and $15.0 million of the swap to SunTrust Bank. See Note 9 for additional information regarding the 2018 Facility. The swap began on November 30, 2015 and will mature on October 28, 2022. We have designated the interest rate swap as a cash flow hedge with the effective portion of the changes in fair value to be recorded in comprehensive income and subsequently reclassified into earnings in the period that the hedged transaction affects earnings. The ineffective portion of the change in fair value, if any, will be recognized directly in earnings. The Company does not expect any amount of the existing gains or losses to be reclassified into earnings within the next 12 months. On November 19, 2015, we, through our Operating Partnership, entered into an interest rate swap with Bank of Montreal that fixed the LIBOR portion of Term Loan 1 under the 2018 Facility at 1.75% . In the fourth quarter of 2015, pursuant to the terms of the agreement governing the interest rate swap, Bank of Montreal assigned $3.8 million of the swap to Regions Bank, $6.5 million of the swap to U.S. Bank, National Association, $14.0 million of the swap to Wells Fargo Bank, National Association, $14.0 million of the swap to Bank of America, N.A., and $5.0 million of the swap to SunTrust Bank. See Note 9 for additional information regarding the 2018 Facility. The swap began on February 3, 2017 and will mature on October 30, 2020. We have designated the interest rate swap as a cash flow hedge with the effective portion of the changes in fair value to be recorded in comprehensive income and subsequently reclassified into earnings in the period that the hedged transaction affects earnings. The ineffective portion of the change in fair value, if any, will be recognized directly in earnings. The Company does not expect any amount of the existing gains or losses to be reclassified into earnings within the next 12 months. On November 19, 2015, we, through our Operating Partnership, entered into an interest rate swap with Bank of Montreal that fixed the LIBOR portion of Term Loan 2 under the 2018 Facility at 1.50% . In the fourth quarter of 2015, pursuant to the terms of the agreement governing the interest rate swap, Bank of Montreal assigned $3.8 million of the swap to Regions Bank, $6.5 million of the swap to U.S. Bank, National Association, $14.0 million of the swap to Wells Fargo Bank, National Association, $14.0 million of the swap to Bank of America, N.A., and $5.0 million of the swap to SunTrust Bank. See Note 9 for additional information regarding the 2018 Facility. The swap began on December 7, 2015 and will mature on January 29, 2021. We have designated the interest rate swap as a cash flow hedge with the effective portion of the changes in fair value to be recorded in comprehensive income and subsequently reclassified into earnings in the period that the hedged transaction affects earnings. The ineffective portion of the change in fair value, if any, will be recognized directly in earnings. The Company does not expect any amount of the existing gains or losses to be reclassified into earnings within the next 12 months. A summary of our interest rate swap activity is as follows (in thousands): Amount Recognized as Comprehensive Income (Loss) Location of Income (Loss) Recognized in Earnings Amount of Income (Loss) Recognized in Earnings (1) Year ended December 31, 2019 $ (9,828 ) Interest expense $ 1,036 Year ended December 31, 2018 $ 1,192 Interest expense $ 646 Year ended December 31, 2017 $ 2,022 Interest expense $ (1,575 ) (1) There was no ineffective portion of our interest rate swaps recognized in earnings for the years ended December 31, 2019 , 2018 and 2017 .

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE Basic earnings per share for our common shareholders is calculated by dividing income from continuing operations excluding amounts attributable to unvested restricted shares and the net income attributable to non-controlling interests by our weighted-average common shares outstanding during the period. Diluted earnings per share is computed by dividing the net income attributable to common shareholders excluding amounts attributable to unvested restricted shares and the net income attributable to non-controlling interests by the weighted-average number of common shares including any dilutive unvested restricted shares. Certain of our performance-based restricted common shares are considered participating securities, which require the use of the two-class method for the computation of basic and diluted earnings per share. During the years ended December 31, 2019 , 2018 and 2017 , 924,314 , 1,011,268 and 1,088,292 OP units, respectively, were excluded from the calculation of diluted earnings per share because their effect would be anti-dilutive. For the years ended December 31, 2019 , 2018 and 2017 , distributions of $41,000 , $317,000 and $472,000 , respectively, were made to the holders of certain restricted common shares, $0 , $16,000 , and $16,000 of which were charged against earnings, annually for the years ended December 31, 2019, 2018, and 2017, respectively. See Note 15 for information related to restricted common shares under the 2008 Plan. Year Ended December 31, (in thousands, except per share data) 2019 2018 2017 Numerator: Income from continuing operations $ 23,634 $ 21,981 $ 8,588 Less: Net income attributable to noncontrolling interests (511 ) (550 ) (254 ) Distributions paid on unvested restricted shares (41 ) (301 ) (456 ) Income from continuing operations attributable to Whitestone REIT excluding amounts attributable to unvested restricted shares 23,082 21,130 7,878 Income from discontinued operations 594 — — Less: Net income attributable to noncontrolling interests (34 ) — — Income from discontinued operations attributable to Whitestone REIT 560 — — Net income attributable to common shareholders excluding amounts attributable to unvested restricted shares $ 23,642 $ 21,130 $ 7,878 Denominator: Weighted average number of common shares - basic 40,184 39,274 35,428 Effect of dilutive securities: Unvested restricted shares 1,278 1,338 827 Weighted average number of common shares - dilutive 41,462 40,612 36,255 Earnings Per Share: Basic: Income from continuing operations attributable to Whitestone REIT excluding amounts attributable to unvested restricted shares $ 0.57 $ 0.54 $ 0.22 Income from discontinued operations attributable to Whitestone REIT 0.02 0.00 0.00 Net income attributable to common shareholders excluding amounts attributable to unvested restricted shares $ 0.59 $ 0.54 $ 0.22 Diluted: Income from continuing operations attributable to Whitestone REIT excluding amounts attributable to unvested restricted shares $ 0.56 $ 0.52 $ 0.22 Income from discontinued operations attributable to Whitestone REIT 0.01 0.00 0.00 Net income attributable to common shareholders excluding amounts attributable to unvested restricted shares $ 0.57 $ 0.52 $ 0.22

Federal Income Taxes

Federal Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Federal Income Taxes	FEDERAL INCOME TAXES Federal income taxes are not provided because we intend to and believe we qualify as a REIT under the provisions of the Code and because we have distributed and intend to continue to distribute all of our taxable income to our shareholders. Our shareholders include their proportionate taxable income in their individual tax returns. As a REIT, we must distribute at least 90% of our real estate investment trust taxable income to our shareholders and meet certain income sources and investment restriction requirements. In addition, REITs are subject to a number of organizational and operational requirements. If we fail to qualify as a REIT in any taxable year, we will be subject to federal income tax on our taxable income at regular corporate tax rates. Taxable income differs from net income for financial reporting purposes principally due to differences in the timing of recognition of interest, real estate taxes, depreciation and rental revenue. For federal income tax purposes, the cash distributions to shareholders are characterized as follows for the years ended December 31: 2019 2018 2017 Ordinary income (unaudited) 28.6 % 39.1 % 15.3 % Return of capital (unaudited) 19.4 % 26.5 % 84.7 % Capital gain distributions (unaudited) 52.0 % 34.4 % — Total 100.0 % 100.0 % 100.0 %

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS The Contribution. Mr. James C. Mastandrea, the Chairman and Chief Executive Officer of the Company, also serves as the Chairman and Chief Executive Officer of Pillarstone REIT and beneficially owns approximately 78.6% of the outstanding equity in Pillarstone REIT (when calculated in accordance with Rule 13d-3(d)(1) under the Exchange Act of 1934, as amended (the “Exchange Act”)). Mr. John J. Dee, the Chief Operating Officer and Corporate Secretary of the Company, also serves as the Senior Vice President and Chief Financial Officer of Pillarstone REIT and beneficially owns approximately 26.8% of the outstanding equity in Pillarstone REIT (when calculated in accordance with Rule 13d-3(d)(1) under the Exchange Act). In addition, Mr. Paul T. Lambert, a Trustee of the Company, also serves as a Trustee of Pillarstone REIT. The Contribution is pursuant to the Company’s strategy of recycling capital by disposing of Non-Core Properties that do not fit the Company’s Community Centered Property ® strategy and the terms of the Contribution Agreement, the OP Unit Purchase Agreement, the Tax Protection Agreement and the Contribution were determined through arm’s-length negotiations. The Contribution was unanimously approved and recommended by a special committee of independent Trustees of the Company. See Note 5 for additional disclosure on the Contribution. Pillarstone OP. For the periods prior to January 1, 2018, Pillarstone OP was accounted for under the profit-sharing method, and related party transactions between the Company and Pillarstone OP were eliminated. As a result of the adoption of Topic 606 and ASC 610 as of January 1, 2018, the Company derecognized the underlying assets and liabilities associated with the Contribution as of January 1, 2018 and recognized the Company’s investment in Pillarstone OP under the equity method. During the ordinary course of business, we have transactions with Pillarstone OP that include, but are not limited to, rental income, interest expense, general and administrative costs, commissions, management and asset management fees, and property expenses. The following table presents the revenue and expenses with Pillarstone OP included in our consolidated statements of operations and comprehensive income for the years ended December 31, 2019 and 2018 (in thousands): Location of Revenue (Expense) 2019 2018 Rent Operating and maintenance $ (813 ) $ (779 ) Property management fee income Management, transaction, and other fees $ 856 $ 1,008 Interest income Interest, dividend and other investment income $ 171 $ 582 On December 8, 2016, we received a $15.4 million financed receivable from Pillarstone OP to provide the financing for the ordinary course of business transactions for Pillarstone OP. The financed receivable has a interest rate of 1.4% - 1.95% plus Libor and a maturity date of December 31, 2019. The financed receivable was paid off on October 17, 2019.

Equity

Equity	12 Months Ended
	Dec. 31, 2019
Stockholders' Equity Note [Abstract]
Equity	EQUITY Under our declaration of trust, as amended, we have authority to issue up to 400 million common shares of beneficial interest, $0.001 par value per share, and up to 50 million preferred shares of beneficial interest, $0.001 par value per share. Equity Offerings On May 31, 2019, we entered into nine equity distribution agreements for an at-the-market equity distribution program (the “2019 equity distribution agreements”) providing for the issuance and sale of up to an aggregate of $100 million of the Company’s common shares pursuant to our Registration Statement on Form S-3 (File No. 333-225007). Actual sales will depend on a variety of factors determined by us from time to time, including (among others) market conditions, the trading price of our common shares, capital needs and our determinations of the appropriate sources of funding for us, and were made in transactions that will be deemed to be “at-the-market” offerings as defined in Rule 415 under the Securities Act. We have no obligation to sell any of our common shares and can at any time suspend offers under the 2019 equity distribution agreements or terminate the 2019 equity distribution agreements. For the year ended December 31, 2019 , we sold 1,612,389 common shares under the 2019 equity distribution agreements, with net proceeds to us of approximately $21.2 million . In connection with such sales, we paid compensation of approximately $324,000 to the sales agents. On April 25, 2017, we completed the sale of 8,018,500 common shares, including 1,018,500 common shares purchased by the underwriters upon exercise of their option to purchase additional common shares, at a public offering price per share of $13.00 (the “April 2017 Offering”). Total net proceeds from the April 2017 Offering, after deducting offering expenses, were approximately $99.9 million , which we contributed to the Operating Partnership in exchange for OP units. The Operating Partnership used the net proceeds from the April 2017 Offering to repay a portion of the 2018 Facility and for general corporate purposes, including funding a portion of the purchase price of BLVD Place and Eldorado Plaza. On June 4, 2015, we entered into nine amended and restated equity distribution agreements (the “2015 equity distribution agreements”) for an at-the-market distribution program. Pursuant to the terms and conditions of the 2015 equity distribution agreements, we could issue and sell up to an aggregate of $50 million of our common shares pursuant to our Registration Statement on Form S-3 (File No. 333-203727), which expired on April 29, 2018. Actual sales depended on a variety of factors determined by us from time to time, including (among others) market conditions, the trading price of our common shares, capital needs and our determinations of the appropriate sources of funding for us, and were made in transactions that will be deemed to be “at-the-market” offerings as defined in Rule 415 under the Securities Act. We had no obligation to sell any of our common shares, and could at any time suspend offers under the 2015 equity distribution agreements or terminate the 2015 equity distribution agreements. For the year ended December 31, 2019 and 2018, we did no t sell any common shares under the 2015 equity distribution agreements. For the year ended December 31, 2017, we sold 1,324,038 common shares under the 2015 equity distribution agreements, with net proceeds to us of approximately $18.6 million . In connection with such sales, we paid compensation of approximately $0.3 million to the sales agents. Operating Partnership Units Substantially all of our business is conducted through the Operating Partnership. We are the sole general partner of the Operating Partnership. As of December 31, 2019 , we owned a 97.9% interest in the Operating Partnership. Limited partners in the Operating Partnership holding OP units have the right to redeem their OP units for cash or, at our option, common shares at a ratio of one OP unit for one common share. Distributions to OP unit holders are paid at the same rate per unit as distributions per share to Whitestone common shares. As of December 31, 2019 and 2018 , there were 42,279,849 and 40,585,688 OP units outstanding, respectively. We owned 41,371,277 and 39,657,207 OP units as of December 31, 2019 and 2018 , respectively. The balance of the OP units is owned by third parties, including certain trustees. Our weighted-average share ownership in the Operating Partnership was approximately 97.7% , 97.5% and 97.0% for the years ended December 31, 2019 , 2018 and 2017 , respectively. For the years ended December 31, 2019 and 2018 , 19,909 and 155,100 OP units, respectively, were redeemed for an equal number of common shares. Distributions The following table reflects the total distributions we have paid (including the total amount paid and the amount paid per share) in each indicated quarter (in thousands, except per share data): Common Shares Noncontrolling OP Unit Holders Total Quarter Paid Distribution Per Common Share Total Amount Paid Distribution Per OP Unit Total Amount Paid Total Amount Paid 2019 Fourth Quarter $ 0.2850 $ 11,580 $ 0.2850 $ 262 $ 11,842 Third Quarter 0.2850 11,430 0.2850 264 11,694 Second Quarter 0.2850 11,316 0.2850 265 11,581 First Quarter 0.2850 11,301 0.2850 264 11,565 Total $ 1.1400 $ 45,627 $ 1.1400 $ 1,055 $ 46,682 2018 Fourth Quarter $ 0.2850 $ 11,302 $ 0.2850 $ 265 $ 11,567 Third Quarter 0.2850 11,294 0.2850 286 11,580 Second Quarter 0.2850 11,203 0.2850 295 11,498 First Quarter 0.2850 11,145 0.2850 309 11,454 Total $ 1.1400 $ 44,944 $ 1.1400 $ 1,155 $ 46,099

Incentive Share Plan

Incentive Share Plan	12 Months Ended
	Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Incentive Share Plan	INCENTIVE SHARE PLAN On July 29, 2008, our shareholders approved the 2008 Plan. On December 22, 2010, our board of trustees amended the 2008 Plan to allow for awards in or related to Class B common shares pursuant to the 2008 Plan. On June 27, 2012, our Class B common shares were redesignated as “common shares.” The 2008 Plan, as amended, provides that awards may be made with respect to common shares of Whitestone or OP units, which may be redeemed for cash or, at our option, common shares of Whitestone. The maximum aggregate number of common shares that may be issued under the 2008 Plan is increased upon each issuance of common shares by Whitestone so that at any time the maximum number of common shares that may be issued under the 2008 Plan shall equal 12.5% of the aggregate number of common shares of Whitestone and OP units issued and outstanding (other than shares and/or units issued to or held by Whitestone). The Compensation Committee of our board of trustees administers the 2008 Plan, except with respect to awards to non-employee trustees, for which the 2008 Plan is administered by our board of trustees. The Compensation Committee is authorized to grant share options, including both incentive share options and non-qualified share options, as well as share appreciation rights, either with or without a related option. The Compensation Committee is also authorized to grant restricted common shares, restricted common share units, performance awards and other share-based awards. On April 2, 2014, the Compensation Committee approved the modification of the vesting provisions with respect to awards of an aggregate of 633,704 restricted common shares and restricted common share units for certain of our employees. The modified time-based shares vested annually in three equal installments. The modified performance-based restricted common shares and restricted common share units were modified to include performance-based vesting based on achievement of certain absolute financial goals, as well as one to two years of time-based vesting post achievement of financial goals. Continued employment is required through the applicable vesting date. Additionally, 2,049,116 restricted performance-based common share units were granted with the same vesting conditions as the modified performance-based grants described above. The performance targets were not met prior to December 31, 2018, any unvested performance-based restricted common shares and restricted common share units were forfeited due to the performance targets not being met. The Compensation Committee approved the grant of an aggregate of 320,000 and 143,000 time-based restricted common share units on June 30, 2016 and 2015, respectively, to James C. Mastandrea and David K. Holeman. On September 6, 2017, the Compensation Committee approved the grant of an aggregate of 267,783 performance-based restricted common share units under the 2008 Plan with market-based vesting conditions (the “TSR Units”) to certain of our employees. Vesting is contingent upon achieving Total Shareholder Return relative to the peer group defined in the TSR Unit award agreements over a three -year performance period. At the end of the performance period, the number of common shares awarded for each vested TSR Unit will be 200% based on the Company’s ranking in the peer group (the “TSR Peer Group Ranking”). Continued employment is required through the vesting date. The grant date fair value for each TSR Unit of $12.37 was determined using the Monte Carlo simulation method and is being recognized as share-based compensation expense ratably from the September 30, 2017 grant date to the end of the performance period, December 31, 2019. The Monte Carlo simulation model utilizes multiple input variables that determine the probability of satisfying the market condition stipulated in the award grant and calculates the fair value of the award. Expected volatilities utilized in the model were estimated using a historical period consistent with the performance period of approximately three years. The risk-free interest rate was based on the United States Treasury rate for a term commensurate with the expected life of the grant. On January 1, 2020, the remaining unvested 247,978 TSR units that were granted on September 6, 2017 vested at 200% achievement into 495,956 common shares. On September 6, 2017, the Compensation Committee approved the grant of an aggregate of 965,000 performance-based restricted common share units under the 2008 Plan which only vest immediately prior to the consummation of a Change in Control (as defined in the 2008 Plan) that occurs on or before September 30, 2024 (the “CIC Units”) to certain of our employees. Continued employment is required through the vesting date. If a Change in Control does not occur on or before September 30, 2024, the CIC Units shall be immediately forfeited. The Company considers a Change in Control on or before September 30, 2024 to be improbable, and no expense has been recognized for the CIC Units. If a Change in Control occurs, any outstanding CIC Units would be expensed immediately on the date of the Change in Control using the grant date fair value. The grant date fair value for each CIC Unit of $13.05 was determined based on the Company’s closing share price on the grant date. At the Company’s annual meeting of shareholders on May 11, 2017, its shareholders voted to approve the 2018 Long-Term Equity Incentive Ownership Plan (the “2018 Plan”). The 2018 Plan provides for the issuance of up to 3,433,831 common shares and OP units pursuant to awards under the 2018 Plan. The 2018 Plan became effective on July 30, 2018, which was the day after the 2008 Plan expired. The Compensation Committee administers the 2018 Plan, except with respect to awards to non-employee trustees, for which the 2018 Plan is administered by the Board of Trustees. The Compensation Committee is authorized to grant share options, including both incentive share options and non-qualified share options, as well as share appreciation rights, either with or without a related option. The Compensation Committee is also authorized to grant restricted common shares, restricted common share units, performance awards and other share-based awards On December 1, 2018, the Compensation Committee approved the grant of an aggregate of 229,684 TSR Units under the 2018 Plan to certain of our employees. Vesting is contingent upon achieving Total Shareholder Return relative to the peer group defined in the TSR Unit award agreements over a three -year performance period. At the end of the performance period, the number of common shares awarded for each vested TSR Unit will vary from 0% to 200% depending on the Company’s TSR Peer Group Ranking. Continued employment is required through the vesting date. The grant date fair value for each TSR Unit of $14.89 was determined using the Monte Carlo simulation method and is being recognized as share-based compensation expense ratably from the December 1, 2018 grant date to the end of the performance period, December 31, 2020. The Monte Carlo simulation model utilizes multiple input variables that determine the probability of satisfying the market condition stipulated in the award grant and calculates the fair value of the award. Expected volatilities utilized in the model were estimated using a historical period consistent with the performance period of approximately three years. The risk-free interest rate was based on the United States Treasury rate for a term commensurate with the expected life of the grant. On June 30, 2019, the Compensation Committee approved the grant of an aggregate of 405,417 TSR Units and 317,184 time-based restricted common share units under the 2018 Plan to certain of our employees. On September 30, 2019, the Compensation Committee approved the grant of 17,069 time-based restricted common share units under the 2018 Plan to certain of our employees. Vesting of the TSR Units is contingent upon achieving Total Shareholder Return relative to the peer group defined in the TSR Unit award agreements over a three-year performance period. At the end of the performance period, the number of common shares awarded for each vested TSR Unit will vary from 0% to 200% depending on the Company’s TSR Peer Group Ranking. Continued employment is required through the vesting date. The grant date fair value for each TSR Unit of $8.22 was determined using the Monte Carlo simulation method and is being recognized as share-based compensation expense ratably from the June 30, 2019 grant date to the end of the performance period, December 31, 2021. The Monte Carlo simulation model utilizes multiple input variables that determine the probability of satisfying the market condition stipulated in the award grant and calculates the fair value of the award. Expected volatilities utilized in the model were estimated using a historical period consistent with the performance period of approximately three years . The risk-free interest rate was based on the United States Treasury rate for a term commensurate with the expected life of the grant. The time-based restricted common share units have a grant date fair value of $10.63 and $11.69 and vest annually in three equal installments for the June 30, 2019 and September 30, 2019 grants, respectively. A summary of the share-based incentive plan activity as of and for the year ended December 31, 2019 is as follows: Shares Weighted-Average Grant Date Fair Value (1) Non-vested at January 1, 2019 1,923,382 $ 12.41 Granted 762,630 9.46 Vested (284,964 ) 11.76 Forfeited (61,116 ) 12.62 Non-vested at December 31, 2019 2,339,932 $ 11.52 Available for grant at December 31, 2019 1,792,528 (1) The fair value of the shares granted were determined based on observable market transactions occurring near the date of the grants. A summary of our nonvested and vested shares activity for the years ended December 31, 2019 , 2018 and 2017 is presented below: Shares Granted Shares Vested Year Ended Non-Vested Shares Issued Weighted-Average Grant-Date Fair Value Vested Shares Total Vest-Date Fair Value (in thousands) Year Ended December 31, 2019 762,630 $ 9.46 (284,964 ) $ 3,352 Year Ended December 31, 2018 653,472 $ 11.07 (560,126 ) $ 7,978 Year Ended December 31, 2017 1,354,534 $ 12.92 (881,710 ) $ 12,829 Total compensation recognized in earnings for share-based payments for the years ended December 31, 2019 , 2018 and 2017 was $6.5 million , $6.8 million and $10.4 million , respectively. Based on our current financial projections, we expect 100% of the unvested awards, exclusive of 895,000 CIC Units, to vest over the next 33 months. As of December 31, 2019 , there was approximately $4.2 million in unrecognized compensation cost related to outstanding non-vested TSR Units, which are expected to vest over a period of 24 months and approximately $4.2 million in unrecognized compensation cost related to outstanding non-vested time-based shares, which are expected to be recognized over a period of approximately 33 months beginning on January 1, 2020. We expect to record approximately $8.4 million in share-based compensation subsequent to the year ended December 31, 2019 . The unrecognized share-based compensation cost is expected to vest over a weighted average period of 23 months. The dilutive impact of the performance-based shares will be included in the denominator of the earnings per share calculation beginning in the period that the performance conditions are expected to be met. The dilutive impact of the TSR Units is based on the Company’s TSR Peer Group Ranking as of the reporting date and weighted according to the number of days outstanding in the period. As of December 31, 2019 , the TSR Peer Group Ranking called for 200% , 100% , and 50% attainment of the TSR Units granted in 2017, 2018, and 2019, respectively. The dilutive impact of the CIC Units is based on the probability of a Change in Control. Because the Company considers a Change in Control on or before September 30, 2024 to be improbable, no CIC Units are included in the Company’s dilutive shares.

Grants to Trustees

Grants to Trustees	12 Months Ended
	Dec. 31, 2019
Grants to Trustees [Abstract]
Grants to Trustees	GRANTS TO TRUSTEES On December 12, 2019, each of our six independent trustees and one trustee emeritus were granted approximately 3,000 common shares, which vest immediately and are prorated based on date appointed. The 19,562 common shares granted to our trustees had a grant fair value of $13.54 per share. On December 12, 2019, two of our independent trustees each elected to receive a total of 3,398 common shares with a grant date fair value of $13.54 in lieu of cash for board fees. The fair value of the shares granted during the year ended December 31, 2019 was determined using quoted prices available on the date of grant. On December 28, 2018, each of our six independent trustees and one trustee emeritus were granted 3,000 common shares, which vest immediately and are prorated based on date appointed. The 21,000 common shares granted to our trustees had a grant fair value of $12.42 per share. On December 28, 2018, two of our independent trustees each elected to receive a total of 4,186 common shares with a grant date fair value of $12.42 in lieu of cash for board fees. The fair value of the shares granted during the year ended December 31, 2018 was determined using quoted prices available on the date of grant. On December 12, 2017, each of our six independent trustees and one trustee emeritus were granted approximately 3,000 common shares, which vest immediately and are prorated based on date appointed. The 16,281 common shares granted to our trustees had a grant fair value of $14.46 per share. On December 12, 2017, three of our independent trustees each elected to receive a total of 2,320 common shares with a grant date fair value of $14.46 in lieu of cash for board fees. The fair value of the shares granted during the year ended December 31, 2017 was determined using quoted prices available on the date of grant.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES We are subject to various legal proceedings and claims that arise in the ordinary course of business. These matters are generally covered by insurance. While the resolution of these matters cannot be predicted with certainty, management believes the final outcome of such matters will not have a material adverse effect on our financial position, results of operations, cash flows or liquidity. On April 16, 2019, a purported shareholder of the Company filed a class action lawsuit in the United States District Court for the Southern District of Texas against the Company, James C. Mastandrea, and David K. Holeman, entitled Clark v. Whitestone REIT, et al ., Case 4:19-cv-01379. A second class action lawsuit was filed but was consolidated into the Clark case. The complaint alleges, among other things, that the Company and the individual defendants violated certain federal securities laws by making materially false and misleading statements in the Company’s Forms 10-Q for the first three quarterly periods of the year ended December 31, 2018 as a result of the accounting errors that required the restatement of our consolidated financial statements for the first three quarterly periods of the year ended December 31, 2018. The purported class period runs from May 9, 2018 through February 27, 2019. The complaint sought, among other things, compensatory damages in an amount to be proven at trial, plus interest, attorneys’ fees, and costs. In August 2019, the complainants in these purported class actions withdrew their claims, and the Court issued an order dismissing them with prejudice. On July 17, 2019, the Company received a demand letter from a purported shareholder containing allegations similar to those contained in the purported class actions. Subsequent to the dismissal of the purported class actions, in September 2019, counsel for the purported shareholder withdrew its demand. On December 12, 2017, a property owner that owns a land parcel adjacent to a Whitestone property filed suit against Whitestone Pinnacle of Scottsdale - Phase II, LLC (“Whitestone Pinnacle”) alleging breach of contract and resulting in the delay of the construction of the their assisted living facility. In May 2019, the claimant amended their report of damages and seeks approximately $2.7 million in restitution from Whitestone Pinnacle. The Company intends to vigorously defend the matter as it believes that these claims are without merit and that it has substantial legal and factual defenses to the claims and allegations contained in the complaint. Based upon the present status of this matter, the Company does not believe it is probable that a loss will be incurred. Accordingly, the Company has not recorded a charge as a result of this action.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Segment Information	SEGMENT INFORMATION Our management historically has not differentiated by property types and therefore does not present segment information.

Selected Quarterly Financial Da

Selected Quarterly Financial Data (unaudited)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Data (unaudited)	SELECTED QUARTERLY FINANCIAL DATA (unaudited) The following is a summary of our unaudited quarterly financial information for the years ended December 31, 2019 and 2018 (in thousands, except per share data): First Second Third Fourth Quarter Quarter Quarter Quarter 2019 Revenues $ 29,694 $ 29,578 $ 29,879 $ 30,100 Net income $ 2,839 $ 3,404 $ 1,849 $ 16,136 Net income attributable to Whitestone REIT $ 2,774 $ 3,327 $ 1,807 $ 15,776 Basic Earnings per share: Income from continuing operations attributable to Whitestone REIT, excluding amounts attributable to unvested restricted shares (1) $ 0.07 $ 0.06 $ 0.04 $ 0.39 Income from discontinued operations attributable to Whitestone REIT (1) 0.00 0.02 0.00 0.00 Net income attributable to common shareholders, excluding amounts attributable to unvested restricted shares (1) $ 0.07 $ 0.08 $ 0.04 $ 0.39 Diluted Earnings per share: Income from continuing operations attributable to Whitestone REIT, excluding amounts attributable to unvested restricted shares (1) $ 0.07 $ 0.06 $ 0.04 $ 0.38 Income from discontinued operations attributable to Whitestone REIT (1) 0.00 0.02 0.00 (0.01 ) Net income attributable to common shareholders, excluding amounts attributable to unvested restricted shares (1) $ 0.07 $ 0.08 $ 0.04 $ 0.37 2018 Revenues $ 29,785 $ 29,473 $ 30,704 $ 29,901 Net income $ 3,269 $ 2,005 $ 8,033 $ 8,674 Net income attributable to Whitestone REIT $ 3,181 $ 1,954 $ 7,835 $ 8,457 Basic Earnings per share: Net income attributable to common shareholders excluding amounts attributable to unvested restricted shares (1) $ 0.08 $ 0.05 $ 0.20 $ 0.21 Diluted Earnings per share: Net income attributable to common shareholders excluding amounts attributable to unvested restricted shares (1) $ 0.08 $ 0.05 $ 0.19 $ 0.21 (1) The sum of individual quarterly basic and diluted earnings per share amounts may not agree with the year-to-date basic and diluted earning per share amounts as the result of each period’s computation being based on the weighted average number of common shares outstanding during that period.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS Management evaluated subsequent events through March 2, 2020 , which was the date the financial statements were available to be issued, and determined that there are no subsequent events to be reported.

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	(in thousands) Balance at Deductions Balance at Beginning from End of Description of Year Charges (1) Reserves Year Allowance for doubtful accounts: Year ended December 31, 2019 $ 9,746 $ 1,484 $ (57 ) $ 11,173 Year ended December 31, 2018 8,608 1,391 (253 ) 9,746 Year ended December 31, 2017 7,133 2,340 (865 ) 8,608 (1) For the year ended December 31, 2019, charges were reductions to revenue. For the years ended December, 31 2018 and 2017, charges were additions to costs and expense.

Schedule III - Real Estate and

Schedule III - Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2019
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Schedule III - Real Estate and Accumulated Depreciation	Costs Capitalized Subsequent Gross Amount at which Carried at Initial Cost (in thousands) to Acquisition (in thousands) End of Period (in thousands) (1) (2) Building and Improvements Carrying Building and Property Name Land Improvements (net) Costs Land Improvements Total Whitestone Properties: Ahwatukee Plaza $ 5,126 $ 4,086 $ 365 $ — $ 5,126 $ 4,451 $ 9,577 Anthem Marketplace 4,790 17,973 1,722 — 4,790 19,695 24,485 Anthem Marketplace Phase II 204 — 492 — 204 492 696 Bissonnet Beltway 415 1,947 484 — 415 2,431 2,846 BLVD Place 63,893 90,942 1,507 — 63,893 92,449 156,342 The Citadel 472 1,777 2,900 — 472 4,677 5,149 City View Village 2,044 4,149 108 — 2,044 4,257 6,301 Davenport Village 11,367 34,101 1,279 — 11,367 35,380 46,747 Desert Canyon 1,976 1,704 2,566 — 1,976 4,270 6,246 Eldorado Plaza 16,551 30,746 250 — 16,551 30,996 47,547 Fountain Hills Plaza 5,113 15,340 255 — 5,113 15,595 20,708 Fountain Square 5,573 9,828 2,327 — 5,573 12,155 17,728 Fulton Ranch Towne Center 7,604 22,612 2,515 — 7,604 25,127 32,731 Gilbert Tuscany Village 1,767 3,233 1,599 — 1,767 4,832 6,599 Gilbert Tuscany Village Hard Corner 856 794 169 — 856 963 1,819 Heritage Trace Plaza 6,209 13,821 622 — 6,209 14,443 20,652 Headquarters Village 7,171 18,439 1,363 — 7,171 19,802 26,973 Keller Place 5,977 7,577 790 — 5,977 8,367 14,344 Kempwood Plaza 733 1,798 2,076 — 733 3,874 4,607 La Mirada 12,853 24,464 1,166 — 12,853 25,630 38,483 Las Colinas Village 16,706 18,098 (167 ) — 16,706 17,931 34,637 Lion Square 1,546 4,289 4,573 — 1,546 8,862 10,408 The Marketplace at Central 1,305 5,324 1,337 — 1,305 6,661 7,966 Market Street at DC Ranch 9,710 26,779 6,786 — 9,710 33,565 43,275 Mercado at Scottsdale Ranch 8,728 12,560 1,553 — 8,728 14,113 22,841 Paradise Plaza 6,155 10,221 1,356 — 6,155 11,577 17,732 Parkside Village North 3,877 8,629 199 — 3,877 8,828 12,705 Parkside Village South 5,562 27,154 424 — 5,562 27,578 33,140 Pima Norte 1,086 7,162 2,748 — 1,086 9,910 10,996 Pinnacle of Scottsdale 6,648 22,466 1,885 — 6,648 24,351 30,999 Pinnacle of Scottsdale Phase II 883 4,659 2,722 — 883 7,381 8,264 The Promenade at Fulton Ranch 5,198 13,367 681 — 5,198 14,048 19,246 Providence 918 3,675 2,931 — 918 6,606 7,524 Quinlan Crossing 9,561 28,683 732 — 9,561 29,415 38,976 Seville 6,913 25,518 637 — 6,913 26,155 33,068 Shaver 184 633 101 — 184 734 918 Shops at Pecos Ranch 3,781 15,123 792 — 3,781 15,915 19,696 Shops at Starwood 4,093 11,487 529 — 4,093 12,016 16,109 Shops at Starwood Phase III 1,818 7,069 2,168 1,153 1,818 10,390 12,208 The Shops at Williams Trace 5,920 14,297 759 — 5,920 15,056 20,976 South Richey 778 2,584 1,960 — 778 4,544 5,322 Spoerlein Commons 2,340 7,296 940 — 2,340 8,236 10,576 The Strand at Huebner Oaks 5,805 12,335 817 — 5,805 13,152 18,957 SugarPark Plaza 1,781 7,125 1,337 — 1,781 8,462 10,243 Sunridge 276 1,186 532 — 276 1,718 1,994 Sunset at Pinnacle Peak 3,610 2,734 756 — 3,610 3,490 7,100 Terravita Marketplace 7,171 9,392 1,086 — 7,171 10,478 17,649 Town Park 850 2,911 450 — 850 3,361 4,211 Costs Capitalized Subsequent Gross Amount at which Carried at Initial Cost (in thousands) to Acquisition (in thousands) End of Period (in thousands) (1) (2) Building and Improvements Carrying Building and Property Name Land Improvements (net) Costs Land Improvements Total Village Square at Dana Park 10,877 40,250 3,804 — 10,877 44,054 54,931 Westchase 423 1,751 3,281 — 423 5,032 5,455 Williams Trace Plaza 6,800 14,003 1,696 — 6,800 15,699 22,499 Windsor Park 2,621 10,482 8,592 — 2,621 19,074 21,695 Woodlake Plaza 1,107 4,426 3,125 — 1,107 7,551 8,658 Total Whitestone Properties $ 305,725 $ 688,999 $ 85,677 $ 1,153 $ 305,725 $ 775,829 $ 1,081,554 Land Held for Development: BLVD Place Phase II-B 10,500 — 15 1,939 10,500 1,954 12,454 Dana Park Development 4,000 — 25 — 4,000 25 4,025 Eldorado Plaza Development 911 — 30 — 911 30 941 Fountain Hills 277 — — — 277 — 277 Market Street at DC Ranch 704 — — — 704 — 704 Total - Land Held for Development $ 16,392 $ — $ 70 $ 1,939 $ 16,392 $ 2,009 $ 18,401 Grand Totals - Whitestone Properties $ 322,117 $ 688,999 $ 85,747 $ 3,092 $ 322,117 $ 777,838 $ 1,099,955 Accumulated Depreciation Date of Date Depreciation Property Name Encumbrances (in thousands) Construction Acquired Life Whitestone Properties: Ahwatukee Plaza $ 943 8/16/2011 5-39 years Anthem Marketplace (3) 3,206 6/28/2013 5-39 years Anthem Marketplace Phase II 9 3/1/2019 5-39 years Bissonnet Beltway 1,958 1/1/1999 5-39 years BLVD Place (4) 6,245 5/26/2017 5-39 years The Citadel 2,042 9/28/2010 5-39 years City View Village 537 3/31/2015 5-39 years Davenport Village 4,548 5/27/2015 5-39 years Desert Canyon 802 4/13/2011 5-39 years Eldorado Plaza 2,091 5/3/2017 5-39 years Fountain Hills Plaza 2,589 10/7/2013 5-39 years Fountain Square 2,758 9/21/2012 5-39 years Fulton Ranch Towne Center 3,259 11/5/2014 5-39 years Gilbert Tuscany Village 1,762 6/28/2011 5-39 years Gilbert Tuscany Village Hard Corner 128 8/28/2015 5-39 years Heritage Trace Plaza 2,152 7/1/2014 5-39 years Headquarters Village (5) 3,699 3/28/2013 5-39 years Keller Place 964 8/26/2015 5-39 years Kempwood Plaza 1,808 2/2/1999 5-39 years La Mirada 2,264 9/30/2016 5-39 years Las Colinas Village 39 12/6/2019 5-39 years Lion Square 5,235 1/1/2000 5-39 years The Marketplace at Central 1,956 11/1/2010 5-39 years Market Street at DC Ranch 6,932 12/5/2013 5-39 years Mercado at Scottsdale Ranch 2,602 6/19/2013 5-39 years Paradise Plaza 2,517 8/8/2012 5-39 years Parkside Village North 1,068 7/2/2015 5-39 years Parkside Village South 3,195 7/2/2015 5-39 years Pima Norte 3,166 10/4/2007 5-39 years Pinnacle of Scottsdale (6) 5,391 12/22/2011 5-39 years Pinnacle of Scottsdale Phase II 934 3/31/2017 5-39 years The Promenade at Fulton Ranch 1,951 11/5/2014 5-39 years Providence 2,510 3/30/2001 5-39 years Quinlan Crossing 3,366 8/26/2015 5-39 years Seville 2,245 9/30/2016 5-39 years Shaver 389 12/17/1999 5-39 years Shops at Pecos Ranch (7) 3,074 12/28/2012 5-39 years Shops at Starwood (8) 2,568 12/28/2011 5-39 years Shops at Starwood Phase III 1,121 12/31/2016 5-39 years The Shops at Williams Trace 2,027 12/24/2014 5-39 years South Richey 2,572 8/25/1999 5-39 years Spoerlein Commons 2,391 1/16/2009 5-39 years The Strand at Huebner Oaks 1,854 9/19/2014 5-39 years SugarPark Plaza 3,265 9/8/2004 5-39 years Sunridge 889 1/1/2002 5-39 years Sunset at Pinnacle Peak 882 5/29/2012 5-39 years Terravita Marketplace (9) 2,389 8/8/2011 5-39 years Town Park 2,225 1/1/1999 5-39 years Accumulated Depreciation Date of Date Depreciation Property Name Encumbrances (in thousands) Construction Acquired Life Village Square at Dana Park (10) 8,776 9/21/2012 5-39 years Westchase 2,365 1/1/2002 5-39 years Williams Trace Plaza 1,937 12/24/2014 5-39 years Windsor Park 9,419 12/16/2003 5-39 years Woodlake Plaza 2,919 3/14/2005 5-39 years $ 137,933 Land Held for Development: BLVD Place Phase II-B — 5/26/2017 Land - Not Depreciated Dana Park Development — 9/21/2012 Land - Not Depreciated Eldorado Plaza Development — 12/29/2017 Land - Not Depreciated Fountain Hills — 10/7/2013 Land - Not Depreciated Market Street at DC Ranch — 12/5/2013 Land - Not Depreciated Total - Land Held For Development $ — Grand Totals - Whitestone Properties $ 137,933 (1) Reconciliations of total real estate carrying value for the three years ended December 31, follows (in thousands): 2019 2018 2017 Balance at beginning of period $ 1,052,238 $ 1,149,454 $ 920,310 Cumulative effect of accounting change for adoption of ASU 2017-05. — (95,146 ) — Additions during the period: Acquisitions 34,804 — 213,545 Improvements 13,474 11,638 17,575 48,278 (83,508 ) 231,120 Deductions - cost of real estate sold or retired (561 ) (13,708 ) (1,976 ) Balance at close of period $ 1,099,955 $ 1,052,238 $ 1,149,454 (2) The aggregate cost of real estate for federal income tax purposes is $1,100,000 . (3) This property secures a $15.1 million mortgage note. (4) This property secures a $80.0 million mortgage note. (5) This property secures a $19.0 million mortgage note. (6) This property secures a $14.1 million mortgage note. (7) This property secures a $14.0 million mortgage note. (8) This property secures a $14.3 million mortgage note. (9) This property secures a $10.5 million mortgage note. (10) A portions of this property secures a $2.6 million mortgage note.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Basis of Consolidation	Basis of Consolidation. We are the sole general partner of the Operating Partnership and possess full legal control and authority over the operations of the Operating Partnership. As of December 31, 2019 , 2018 and 2017 , we owned a majority of the partnership interests in the Operating Partnership. Consequently, the accompanying consolidated financial statements include the accounts of the Operating Partnership. Noncontrolling interest in the accompanying consolidated financial statements represents the share of equity and earnings of the Operating Partnership allocable to holders of partnership interests other than us. Net income or loss is allocated to noncontrolling interests based on the weighted-average percentage ownership of the Operating Partnership during the year. Issuance of additional common shares of beneficial interest in Whitestone (the “common shares”) and units of limited partnership interest in the Operating Partnership that are convertible into cash or, at our option, common shares on a one -for- one basis (the “OP units”) changes the percentage of ownership interests of both the noncontrolling interests and Whitestone.
Profit-sharing Method	Profit-sharing Method. In accordance with the Financial Accounting Standards Board’s (“FASB”) guidance applicable to sales of real estate or interests therein, specifically FASB Accounting Standards Codification (“ASC”) 360-20, “Real Estate Sales,” Topic 606, “Revenue from Contracts with Customers” and ASC 610, “Other Income–Gains and Losses from the Derecognition of Nonfinancial Assets,” we did not recognize the sale of assets to Pillarstone OP in the Contribution (as defined in Note 5) and accounted for the transaction under the profit-sharing method for the year ended December 31, 2017. We recognized Pillarstone OP’s real estate assets and notes payables in our consolidated balance sheets. Additionally, the profits and losses of Pillarstone OP not attributable to the Company are reported as profit sharing expense. As a result of the adoption of Topic 606 and ASC 610, the Company derecognized the underlying assets and liabilities associated with the Contribution as of January 1, 2018 and recognized the Company’s investment in Pillarstone OP under the equity method.
Equity Method	Noncontrolling Interests. Noncontrolling interests are the portion of equity in a subsidiary not attributable to a parent. The ownership interests not held by the parent are considered noncontrolling interests. Accordingly, we have reported noncontrolling interests in equity on the consolidated balance sheets but separate from Whitestone’s equity. On the consolidated statements of operations and comprehensive income, subsidiaries are reported at the consolidated amount, including both the amount attributable to Whitestone and noncontrolling interests. Consolidated statements of changes in equity are included for both quarterly and annual financial statements, including beginning balances, activity for the period and ending balances for shareholders’ equity, noncontrolling interests and total equity. Equity Method. For the years prior to December 31, 2017, Pillarstone OP was accounted for under the profit-sharing method. We adopted Topic 606 and ASC 610 as of January 1, 2018, resulting in the derecognition of the underlying assets and liabilities associated with the Contribution (defined below) as of January 1, 2018 and the recognition of the Company’s investment in Pillarstone OP under the equity method. See Note 5 for additional disclosure on Pillarstone OP.
Basis of Accounting	Basis of Accounting. Our financial records are maintained on the accrual basis of accounting whereby revenues are recognized when earned and expenses are recorded when incurred.
Use of Estimates	Use of Estimates. The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates that we use include the estimated fair values of properties acquired, the estimated useful lives for depreciable and amortizable assets and costs, the estimated allowance for doubtful accounts, the estimated fair value of interest rate swaps and the estimates supporting our impairment analysis for the carrying values of our real estate assets. Actual results could differ from those estimates.
Reclassifications	Reclassifications. We have reclassified certain prior year amounts in the accompanying consolidated financial statements in order to be consistent with the current fiscal year presentation. Other than the effects noted below, these reclassifications had no effect on net income, total assets, total liabilities or equity.
Restricted Cash	Restricted Cash. We classify all cash pledged as collateral to secure certain obligations and all cash whose use is limited as restricted cash. During 2015, pursuant to the terms of our $15.1 million 4.99% Note, due January 6, 2024, which is collateralized by our Anthem Marketplace property, we were required by the lenders thereunder to establish a cash management account controlled by the lenders to collect all amounts generated by our Anthem Marketplace property in order to collateralize such promissory note.
Share-Based Compensation	Share-Based Compensation. From time to time, we award nonvested restricted common share awards or restricted common share unit awards, which may be converted into common shares, to executive officers and employees under our 2018 Long-Term Equity Incentive Ownership Plan (the “2018 Plan”). Awarded shares and units vest when certain performance conditions are met. We recognize compensation expense when achievement of the performance conditions is probable based on management’s most recent estimates using the fair value of the shares as of the grant date.
Revenue Recognition	Revenue Recognition. All leases on our properties are classified as operating leases, and the related rental income is recognized on a straight-line basis over the terms of the related leases. Differences between rental income earned and amounts due per the respective lease agreements are capitalized or charged, as applicable, to accrued rents and accounts receivable. Percentage rents are recognized as rental income when the thresholds upon which they are based have been met. Recoveries from tenants for taxes, insurance, and other operating expenses are recognized as revenues in the period the corresponding costs are incurred. We combine lease and nonlease components in lease contracts, which includes combining base rent, recoveries, and percentage rents into a single line item, Rental , within the consolidated statements of operations and comprehensive income. Additionally, we have tenants who pay real estate taxes directly to the taxing authority. We exclude these costs paid directly by the tenant to third parties on our behalf from revenue recognized and the associated property operating expense. Other property income primarily includes amounts recorded in connection with management fees and lease termination fees. Pillarstone OP pays us management fees for property management, leasing and day-to-day advisory and administrative services. Their obligations are satisfied over time. Pillarstone OP is billed monthly and typically pays quarterly. Revenues are governed by the Management Agreements (as defined in Note 5). Refer to Note 5 to our accompanying consolidated financial statements for additional information regarding the Management Agreements with Pillarstone OP. Additionally, we recognize lease termination fees in the year that the lease is terminated and collection of the fee is probable. Amounts recorded within other property income are accounted for at the point in time when control of the goods or services transfers to the customer and our performance obligation is satisfied.
Cash and Cash Equivalents	Cash and Cash Equivalents. We consider all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents. Cash and cash equivalents as of December 31, 2019 and 2018 consisted of demand deposits at commercial banks and brokerage accounts. We may have net book credit balances in our primary disbursement accounts at the end of a reporting period. We classify such credit balances as accounts payable in our consolidated balance sheets as checks presented for payment to these accounts are not payable by our banks under overdraft arrangements, and, therefore, do not represent short-term borrowings.
Marketable Securities	Marketable Securities. We classify our existing marketable equity securities as available-for-sale in accordance with the Financial Accounting Standards Board’s (“FASB”) Investments-Debt and Equity Securities guidance. These securities are carried at fair value with unrealized gains and losses reported in equity as a component of accumulated other comprehensive income or loss. The fair value of the marketable securities is determined using Level 1 inputs under FASB Accounting Standards Codification (“ASC”) 820, “ Fair Value Measurements and Disclosures.” Level 1 inputs represent quoted prices available in an active market for identical investments as of the reporting date. Gains and losses on securities sold are based on the specific identification method, and are reported as a component of interest, dividend and other investment income.
Development Properties	Development Properties. Land, buildings and improvements are recorded at cost. Expenditures related to the development of real estate are carried at cost which includes capitalized carrying charges and development costs. Carrying charges (interest, real estate taxes, loan fees, and direct and indirect development costs related to buildings under construction) are capitalized as part of construction in progress. The capitalization of such costs ceases when the property, or any completed portion, becomes available for occupancy.
Acquired Properties and Acquired Lease Intangibles	Acquired Properties and Acquired Lease Intangibles. We allocate the purchase price of the acquired properties to land, building and improvements, identifiable intangible assets and to the acquired liabilities based on their respective fair values at the time of purchase. Identifiable intangibles include amounts allocated to acquired out-of-market leases, the value of in-place leases and customer relationship value, if any. We determine fair value based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends and specific market and economic conditions that may affect the property. Factors considered by management in our analysis of determining the as-if-vacant property value include an estimate of carrying costs during the expected lease-up periods considering market conditions, and costs to execute similar leases. In estimating carrying costs, management includes real estate taxes, insurance and estimates of lost rentals at market rates during the expected lease-up periods, tenant demand and other economic conditions. Management also estimates costs to execute similar leases including leasing commissions, tenant improvements, legal and other related expenses. Intangibles related to out-of-market leases and in-place lease value are recorded as acquired lease intangibles and are amortized as an adjustment to rental revenue or amortization expense, as appropriate, over the remaining terms of the underlying leases. Premiums or discounts on acquired out-of-market debt are amortized to interest expense over the remaining term of such debt.
Depreciation	Depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of 5 to 39 years for improvements and buildings, respectively. Tenant improvements are depreciated using the straight-line method over the life of the improvement or remaining term of the lease, whichever is shorter.
Impairment	Impairment. We review our properties for impairment at least annually or whenever events or changes in circumstances indicate that the carrying amount of the assets, including accrued rental income, may not be recoverable through operations. We determine whether an impairment in value has occurred by comparing the estimated future cash flows (undiscounted and without interest charges), including the estimated residual value of the property, with the carrying cost of the property. If impairment is indicated, a loss will be recorded for the amount by which the carrying value of the property exceeds its fair value. Management has determined that there has been no impairment in the carrying value of our real estate assets as of December 31, 2019 .
Accrued Rents and Accounts Receivable	Accrued Rents and Accounts Receivable. Included in accrued rents and accounts receivable are base rents, tenant reimbursements and receivables attributable to recording rents on a straight-line basis. We review the collectability of charges under our tenant operating leases on a regular basis, taking into consideration changes in factors such as the tenant’s payment history, the financial condition of the tenant, business conditions in the industry in which the tenant operates and economic conditions in the area where the property is located. With the adoption of ASC No. 842, Leases (“Topic 842”), as of January 1, 2019 we recognize an adjustment to rental revenue if we deem it probable that the receivable will not be collected. Prior to the adoption of Topic 842, we recognized an allowance for doubtful accounts and bad debt expense of the specific rents receivable. Our review of collectability under our operating leases includes any accrued rental revenues related to the straight-line method of reporting rental revenue.
Unamortized Lease Commissions and Loan Costs	Unamortized Lease Commissions and Loan Costs. Leasing commissions are amortized using the straight-line method over the terms of the related lease agreements. Loan costs are amortized on the straight-line method over the terms of the loans, which approximates the interest method. Costs allocated to in-place leases whose terms differ from market terms related to acquired properties are amortized over the remaining life of the respective leases.
Prepaids and Other Assets, Policy	Prepaids and Other Assets. Prepaids and other assets include escrows established pursuant to certain mortgage financing arrangements for real estate taxes and insurance and acquisition deposits which include earnest money deposits on future acquisitions.
Federal Income and State Taxes	Federal Income Taxes. We elected to be taxed as a REIT under the Code beginning with our taxable year ended December 31, 1999. As a REIT, we generally are not subject to federal income tax on income that we distribute to our shareholders. If we fail to qualify as a REIT in any taxable year, we will be subject to federal income tax on our taxable income at regular corporate rates. We believe that we are organized and operate in such a manner as to qualify to be taxed as a REIT, and we intend to operate so as to remain qualified as a REIT for federal income tax purposes. State Taxes. We are subject to the Texas Margin Tax, which is computed by applying the applicable tax rate ( 1% for us) to the profit margin, which, generally, will be determined for us as total revenue less a 30% standard deduction. Although the Texas Margin Tax is not considered an income tax, FASB ASC 740, “Income Taxes” (“ASC 740”) applies to the Texas Margin Tax.
Fair Value of Financial Instruments	Fair Value of Financial Instruments. Our financial instruments consist primarily of cash, cash equivalents, accounts receivable, accounts and notes payable and investments in marketable securities. The carrying value of cash, cash equivalents, accounts receivable and accounts payable are representative of their respective fair values due to their short-term nature. The fair value of our long-term debt, consisting of fixed rate secured notes, variable rate secured notes and an unsecured revolving credit facility aggregate to approximately $653.7 million and $618.6 million as compared to the book value of approximately $645.9 million and $619.4 million as of December 31, 2019 and 2018 , respectively. The fair value of our long-term debt is estimated on a Level 2 basis (as provided by ASC 820, “Fair Value Measurements and Disclosures ” (“ASC 820”)), using a discounted cash flow analysis based on the borrowing rates currently available to us for loans with similar terms and maturities, discounting the future contractual interest and principal payments. The fair value of our loan guarantee to Pillarstone OP is estimated on a Level 3 basis (as provided by ASC 820, “ Fair Value Measurements and Disclosures” ), using a probability-weighted discounted cash flow analysis based on a discount rate, discounting the loan balance. The fair value of the loan guarantee is $0.1 million and $0.3 million as compared to the book value of approximately $0.1 million and $0.3 million as of December 31, 2019 and 2018 , respectively. Disclosure about fair value of financial instruments is based on pertinent information available to management as of December 31, 2019 and 2018 . Although management is not aware of any factors that would significantly affect the fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since December 31, 2019 and current estimates of fair value may differ significantly from the amounts presented herein.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities. We utilize derivative financial instruments, principally interest rate swaps, to manage our exposure to fluctuations in interest rates. We have established policies and procedures for risk assessment, and the approval, reporting and monitoring of derivative financial instruments. We recognize our interest rate swaps as cash flow hedges with the effective portion of the changes in fair value recorded in comprehensive income and subsequently reclassified into earnings in the period that the hedged transaction affects earnings. Any ineffective portion of a cash flow hedge’s change in fair value is recorded immediately into earnings. Our cash flow hedges are determined using Level 2 inputs under ASC 820. Level 2 inputs represent quoted prices in active markets for similar assets or liabilities; quoted prices in markets that are not active; and model-derived valuations whose inputs are observable. As of December 31, 2019 , we consider our cash flow hedges to be highly effective.
Concentration of Risk	Concentration of Risk. Substantially all of our revenues are obtained from office, warehouse and retail locations in the Austin, Chicago, Dallas-Fort Worth, Houston, Phoenix and San Antonio metropolitan areas. We maintain cash accounts in major U.S. financial institutions. The terms of these deposits are on demand to minimize risk. The balances of these accounts sometimes exceed the federally insured limits, although no losses have been incurred in connection with these deposits.
Recent Accounting Pronouncements	Recent Accounting Pronouncements. In May 2014, the FASB issued guidance, as amended in subsequent updates, establishing a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and superseded most of the existing revenue recognition guidance. The standard also required an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services and also required certain additional disclosures. This guidance became effective for the reporting periods beginning on or after December 15, 2017, and interim periods within those fiscal years. We adopted this guidance on a modified retrospective basis beginning January 1, 2018 and have derecognized the underlying assets and liabilities associated with the Contribution as of January 1, 2018 and have recognized the Company’s investment in Pillarstone OP under the equity method of accounting. The Company made an adjustment which decreased the Company’s accumulated deficit as of January 1, 2018 by $19.1 million . See Note 5 for further details. In February 2016, FASB issued ASU No. 2016-2 which provided the principles for the recognition, measurement, presentation and disclosure of leases. Additional guidance and targeted improvements to Topic 842 were made through the issuance of supplementary ASUs in July 2018, December 2018 and March 2019. Effective January 1, 2019, we adopted the new lease accounting guidance in Topic 842. As the lessee and lessor, we have elected the package of practical expedients permitted in Topic 842. Accordingly, we have accounted for our existing operating leases as operating leases under the new guidance, without reassessing (a) whether the contract contains a lease under Topic 842, (b) whether classification of the operating lease would be different in accordance with Topic 842, or (c) whether the unamortized initial direct costs before transition adjustments (as of December 31, 2018) would have met the definition of initial direct costs in Topic 842 at lease commencement. Additionally, as the lessee and lessor we will use hindsight in determining the lease term and in assessing impairment of our right-of-use assets. As a result of the adoption of the new lease accounting guidance, as the lessee, we recognized on January 1, 2019 (a) a lease liability of approximately $1.1 million , which represents the present value of the remaining lease payments of approximately $1.2 million discounted using our incremental borrowing rate of 4.5% , and (b) a right-of-use asset of approximately $1.1 million . The adoption of Topic 842 did not have a material impact to our net income and related per share amounts. Upon adoption of Topic 842, lessees and lessors are required to apply a modified retrospective transition approach. Reporting entities are permitted to choose one of two methods to recognize and measure leases within the scope of Topic 842: • Apply Topic 842 to each lease that existed at the beginning of the earliest comparative period presented in the financial statements as well as leases that commenced after that date. Under this method, prior comparative periods presented are adjusted. For leases that commenced prior to the beginning of the earliest comparative period presented, a cumulative-effect adjustment is recognized at that date. • Apply the guidance to each lease that had commenced as of the beginning of the reporting period in which the entity first applies the lease standard with a cumulative-effect adjustment as of that date. Prior comparative periods would not be adjusted under this method. We have elected an optional transition method that allows entities to initially apply Topic 842 at January 1, 2019, the date of adoption, and to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. As the lessor, we have not assessed unamortized legal costs as part of the package of practical expedients, and we will not make any adjustment to retained earnings at the date of adoption to write off unamortized legal costs. We will continue to amortize unamortized legal costs as of December 31, 2018 over the life of the respective leases. We did not have a cumulative-effect adjustment as of the adoption date. Additionally, the optional transition method does allow us to not have to apply the new standard (including disclosure requirements) to comparative periods presented. Those periods can continue to be presented in accordance with prior generally accepted accounting principles. Topic 842 requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases and operating leases. Based on our election of the package of practical expedients, our existing commercial leases, where we are the lessor, continue to be accounted for as operating leases under the new standard. However, Topic 842 changed certain requirements regarding the classification of leases that could result in us recognizing certain long-term leases entered into or modified after January 1, 2019 as sales-type leases or finance leases, as opposed to operating leases. We will continue to monitor our leases following the adoption date to ensure that they are classified in accordance with the new lease standards. We elected a practical expedient which allows lessors to not separate non-lease components from the lease component when the timing and pattern of transfer for the lease components and non-lease components are the same and if the lease component is classified as an operating lease. As a result, we now present all rentals and reimbursements from tenants as a single line item, Rental , within the consolidated statements of operations and comprehensive income. We review the collectability of charges under our tenant operating leases on a regular basis, taking into consideration changes in factors such as the tenant’s payment history, the financial condition of the tenant, business conditions in the industry in which the tenant operates and economic conditions in the area where the property is located. Each tenant is included in one of several portfolios and an allowance is calculated using the calculation methodology for the respective portfolio. With the adoption of Topic 842, we will recognize an adjustment to rental revenue if we deem it probable that the receivable will not be collected. Prior to the adoption of Topic 842, we recognized an allowance for doubtful accounts and bad debt expense of the specific rents receivable. Our review of collectability under our operating leases includes any accrued rental revenues related to the straight-line method of reporting rental revenue. In November 2016, the FASB issued guidance requiring that the statement of cash flows explain the change during the period in the total cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance became effective for the reporting periods beginning on or after December 15, 2017, and interim periods within those fiscal years. We adopted this guidance effective January 1, 2018, and we have reconciled cash and cash equivalents and restricted cash and restricted cash equivalents on a retrospective basis, whereas under the previous guidance, we reported restricted cash and restricted cash equivalents under cash flows from financing activities. In January 2017, the FASB issued guidance clarifying the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or dispositions) of assets or businesses. This guidance became effective for the reporting periods beginning on or after December 15, 2017, and interim periods within those fiscal years. We adopted this guidance on a prospective basis beginning January 1, 2018 and believe the majority of our future acquisitions will qualify as asset acquisitions and the associated transaction costs will be capitalized as opposed to expensed under previous guidance. For the year ending December 31, 2019 , we capitalized $0.1 million in associated transaction costs. In February 2017, the FASB issued guidance clarifying the scope of asset derecognition guidance, adding guidance for partial sales of nonfinancial assets and clarifying recognizing gains and losses from the transfer of nonfinancial assets in contracts with noncustomers. This guidance became effective for the reporting periods beginning on or after December 15, 2017, and interim periods within those fiscal years. We adopted this guidance on a modified retrospective basis beginning January 1, 2018 and have derecognized the underlying assets and liabilities associated with the Contribution as of January 1, 2018 and have recognized the Company’s investment in Pillarstone OP under the equity method of accounting. The Company made an adjustment which decreased the Company’s accumulated deficit as of January 1, 2018 by $19.1 million . See Note 5 for further details.

Real Estate (Tables)

Real Estate (Tables)	12 Months Ended
	Dec. 31, 2019
Real Estate [Abstract]
Schedule of pro forma results of operations	The following unaudited pro forma results summarized below reflect our consolidated results of operations as if our acquisitions for the years ended December 31, 2019 , 2018 and 2017 were acquired on January 1, 2017 . The unaudited consolidated pro forma results of operations is not necessarily indicative of what the actual results of operations would have been, assuming the transactions had been completed as set forth above, nor do they purport to represent our results of operations for future periods. Year Ended December 31, (in thousands, except per share data) 2019 2018 2017 Total revenues $ 122,286 $ 123,243 $ 137,043 Net income $ 24,047 $ 21,876 $ 11,217 Net income attributable to Whitestone REIT (1) $ 23,502 $ 21,326 $ 10,888 Basic Earnings Per Share: $ 0.58 $ 0.54 $ 0.28 Diluted Earnings Per Share: $ 0.57 $ 0.52 $ 0.27 Weighted-average common shares outstanding: Basic (2) 40,184 39,274 37,933 Diluted (2) 41,462 40,612 38,760 (1) Net income attributable to Whitestone REIT reflects historical ownership percentages and does not reflect the effects of the April 2017 Offering (as defined in Note 14), assuming the sale of the common shares took place on January 1, 2017 , as the related impact on ownership percentage is minimal. (2) Pro forma weighted averages reflect the April 2017 Offering, assuming the sale of the common shares took place on January 1, 2017 .

Investment in Real Estate Par_2

Investment in Real Estate Partnership (Tables)	12 Months Ended
	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Equity Method Investments	Summarized financial information for the Company’s investment in real estate partnership is as follows (in thousands): Year Ended December 31, 2019 2018 Assets: Real estate, net $ 50,338 $ 72,661 Other assets 6,742 6,617 Total assets 57,080 79,278 Liabilities and equity: Notes payable 15,434 47,064 Other liabilities 3,575 4,322 Equity 38,071 27,892 Total liabilities and equity 57,080 79,278 Company’s share of equity 31,008 22,717 Cost of investment in excess of the Company’s share of underlying net book value 3,089 3,519 Carrying value of investment in real estate partnership $ 34,097 $ 26,236 Year Ended December 31, 2019 2018 Rental revenues $ 14,253 $ 17,180 Property expenses (9,045 ) (6,687 ) Other expenses (3,449 ) (7,848 ) Gain on sale of properties or disposal of assets 16,943 7,839 Net income $ 18,702 $ 10,484 The table below presents the real estate partnership investment in which the Company held an ownership interest (in thousands): The Company’s Investment as of December 31, 2019 2018 Real estate partnership Ownership Interest Pillarstone OP (1)(2) 81.4% $ 34,097 $ 26,236 Total real estate partnership (3) $ 34,097 $ 26,236 (1) The Company manages these real estate partnership investments and, where applicable, earns acquisition fees, leasing commissions, property management fees, and asset management fees. (2) As of December 31, 2017, the Company had a net deferred gain of $18.0 million relating to the sale of properties to Pillarstone OP prior to the adoption of ASU 2017-05. These deferred gains were included in the Company’s investment above. Upon adoption, the Company recorded a cumulative-effect adjustment of $19.1 million to its beginning accumulated deficit as of January 1, 2018 on the Company’s Consolidated Statements of Changes in Equity. (3) Representing eight property interests and 0.9 million square feet of GLA, as of December 31, 2019 , and 11 property interests and 1.3 million square feet of GLA, as of December 31, 2018 .
Real Estate Investment Financial Statements, Disclosure	As a result of the adoption of Topic 606 and ASC 610, the Company recognized the Company’s investment in Pillarstone OP under the equity method for the years ended December 31, 2019 and 2018 . For the year ended December 31, 2017, Pillarstone OP was accounted for using the profit-sharing method. The table below presents the Company’s share of net income from its investment in the real estate partnership which is included in equity in earnings of real estate partnership, net on the Company’s Consolidated Statements of Operations and Comprehensive Income (in thousands): Year Ended December 31, 2019 2018 Pillarstone OP $ 15,076 $ 8,431
Schedule of Guarantor Obligations	The Company's maximum exposure to loss relating to Pillarstone OP as of December 31, 2017 was as follows (in thousands): Net carrying value $ 14,421 OP Unit Purchase Agreement 3,000 Notes payable 48,840 Maximum exposure to loss $ 66,261

Accrued Rents and Accounts Re_2

Accrued Rents and Accounts Receivable, Net (Tables)	12 Months Ended
	Dec. 31, 2019
Receivables [Abstract]
Schedule of Accrued Rent and Accounts Receivable, Net	Accrued rents and accounts receivable, net, consists of amounts accrued, billed and due from tenants, allowance for doubtful accounts and other receivables as follows (in thousands): December 31, 2019 2018 Tenant receivables $ 16,741 $ 14,686 Accrued rents and other recoveries 16,983 16,423 Allowance for doubtful accounts (11,173 ) (9,746 ) Other receivables 303 279 Totals $ 22,854 $ 21,642

Unamortized Lease Commissions_2

Unamortized Lease Commissions, Legal Fees and Loan Costs (Tables)	12 Months Ended
	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Unamortized Leasing Comissions and Loan Costs	Costs which have been deferred consist of the following (in thousands): December 31, 2019 2018 Leasing commissions $ 9,868 $ 8,789 Deferred legal cost 393 406 Deferred financing cost 3,908 4,076 Total cost 14,169 13,271 Less: leasing commissions accumulated amortization (4,200 ) (3,534 ) Less: deferred legal cost accumulated amortization (179 ) (125 ) Less: deferred financing cost accumulated amortization (830 ) (2,914 ) Total cost, net of accumulated amortization $ 8,960 $ 6,698
Schedule of Expected Future Amortization of Deferred Costs	A summary of expected future amortization of deferred costs is as follows (in thousands): Years Ended December 31, Leasing Commissions Deferred Legal Costs Deferred Financing Costs Total 2020 $ 1,593 $ 59 $ 900 $ 2,552 2021 1,365 45 900 2,310 2022 1,117 35 839 1,991 2023 853 22 220 1,095 2024 612 20 192 824 Thereafter 128 33 27 188 Total $ 5,668 $ 214 $ 3,078 $ 8,960

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Lessor, Operating Lease, Payments to be Received, Maturity	A summary of minimum future rents to be received (exclusive of renewals, tenant reimbursements, contingent rents, and collectability adjustments under Topic 842) under noncancelable operating leases in existence as of December 31, 2019 is as follows (in thousands): Years Ended December 31, Minimum Future Rents (1) 2020 $ 83,552 2021 72,507 2022 60,766 2023 48,812 2024 36,988 Thereafter 110,496 Total $ 413,121 (1) These amounts do not reflect future rental revenues from the renewal or replacement of existing leases and exclude reimbursements of operating expenses and rental increases that are not fixed.
Lessee, Operating Lease, Liability, Maturity	The following table summarizes the fixed, future minimum rental payments, excluding variable costs, which are discounted by our weighted average incremental borrowing rates to calculate the lease liabilities for our operating leases in existence as of December 31, 2019 in which we are the lessee (in thousands): Years Ended December 31, Minimum Future Rents 2020 $ 919 2021 412 2022 50 2023 4 Total undiscounted rental payments 1,385 Less imputed interest 54 Total lease liabilities $ 1,331
Schedule of Future Minimum Rental Payments for Operating Leases	A summary of minimum future rents to be received (exclusive of renewals, tenant reimbursements, and contingent rents) under noncancelable operating leases in existence as of December 31, 2018 is as follows (in thousands): Years Ended December 31, Minimum Future Rents 2019 $ 81,149 2020 70,181 2021 59,550 2022 48,431 2023 37,327 Thereafter 122,102 Total $ 418,740
Schedule of Contractual Obligations	As of December 31, 2019 , we had the following contractual obligations (in thousands): Payment due by period (in thousands) Consolidated Contractual Obligations Total Less than 1 1 - 3 years 3 - 5 years More than Long-Term Debt - Principal $ 645,896 $ 10,951 $ 103,294 $ 365,936 $ 165,715 Long-Term Debt - Fixed Interest 107,674 21,742 41,975 26,746 17,211 Long-Term Debt - Variable Interest (1) 13,633 4,544 9,089 — — Unsecured credit facility - Unused commitment fee (2) 1,077 351 702 24 — Operating Lease Obligations 212 126 82 4 — Related Party Rent Lease Obligations 1,170 790 380 — — Total $ 769,662 $ 38,504 $ 155,522 $ 392,710 $ 182,926 (1) As of December 31, 2019 , we had one loan totaling $109.5 million which bore interest at a floating rate. The variable interest rate payments are based on LIBOR plus 1.40% to LIBOR plus 1.90% , which reflects our new interest rates under the 2019 Facility. The information in the table above reflects our projected interest rate obligations for the floating rate payments based on one-month LIBOR as of December 31, 2019 , of 1.76% . (2) The unused commitment fees on the 2019 Facility, payable quarterly, are based on the average daily unused amount of the 2019 Facility. The fees are 0.20% for facility usage greater than 50% or 0.25% for facility usage less than 50% . The information in the table above reflects our projected obligations for the 2019 Facility based on our December 31, 2019 balance of $374.5 million .

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Schedule of Debt	Mortgages and other notes payable consist of the following (in thousands): December 31, Description 2019 2018 Fixed rate notes $10.5 million, 4.85% Note, due September 24, 2020 (1) $ 9,260 $ 9,500 $50.0 million, 1.75% plus 1.35% to 1.90% Note, due October 30, 2020 (2) — 50,000 $50.0 million, 1.50% plus 1.35% to 1.90% Note, due January 29, 2021 (3) — 50,000 $100.0 million, 1.73% plus 1.35% to 1.90% Note, due October 30, 2022 (4) 100,000 100,000 $165.0 million, 2.24% plus 1.35% to 1.90% Note, due January 31, 2024 (5) 165,000 — $80.0 million, 3.72% Note, due June 1, 2027 80,000 80,000 $6.5 million 3.80% Note, due January 1, 2019 — 5,657 $19.0 million 4.15% Note, due December 1, 2024 19,000 19,000 $20.2 million 4.28% Note, due June 6, 2023 18,616 18,996 $14.0 million 4.34% Note, due September 11, 2024 13,482 13,718 $14.3 million 4.34% Note, due September 11, 2024 14,243 14,300 $15.1 million 4.99% Note, due January 6, 2024 14,409 14,643 $2.6 million 5.46% Note, due October 1, 2023 2,386 2,430 $50.0 million, 5.09% Note, due March 22, 2029 50,000 — $50.0 million, 5.17% Note, due March 22, 2029 50,000 — Floating rate notes Unsecured line of credit, LIBOR plus 1.40% to 1.90%, due January 31, 2023 (6) 109,500 241,200 Total notes payable principal 645,896 619,444 Less deferred financing costs, net of accumulated amortization (1,197 ) (1,239 ) $ 644,699 $ 618,205 (1) Promissory note includes an interest rate swap that fixed the interest rate at 3.55% for the duration of the term through September 24, 2018 and 4.85% beginning September 25, 2018 through September 24, 2020. (2) Promissory note includes an interest rate swap that fixed the LIBOR portion of Term Loan 1 (as defined below) at 0.84% through February 3, 2017 and 1.75% beginning February 4, 2017 through October 30, 2020. (3) Promissory note includes an interest rate swap that fixed the LIBOR portion of Term Loan 2 (as defined below) at 1.50% . (4) Promissory note includes an interest rate swap that fixed the LIBOR portion of Term Loan 3 (as defined below) at 1.73% . (5) Promissory note includes an interest rate swap that fixed the LIBOR portion of the interest rate at an average rate of 2.24% for the duration of the term through January 31, 2024. (6) Unsecured line of credit includes certain Pillarstone Properties as of December 31, 2018, in determining the amount of credit available under the 2018 Facility which were released from collateral during 2019.
Schedule of Maturities of Debt	Scheduled maturities of our outstanding debt as of December 31, 2019 were as follows (in thousands): Year Amount Due 2020 $ 10,951 2021 1,611 2022 101,683 2023 137,363 2024 228,573 Thereafter 165,715 Total $ 645,896
Schedule of Contractual Obligations	As of December 31, 2019 , we had the following contractual obligations (in thousands): Payment due by period (in thousands) Consolidated Contractual Obligations Total Less than 1 1 - 3 years 3 - 5 years More than Long-Term Debt - Principal $ 645,896 $ 10,951 $ 103,294 $ 365,936 $ 165,715 Long-Term Debt - Fixed Interest 107,674 21,742 41,975 26,746 17,211 Long-Term Debt - Variable Interest (1) 13,633 4,544 9,089 — — Unsecured credit facility - Unused commitment fee (2) 1,077 351 702 24 — Operating Lease Obligations 212 126 82 4 — Related Party Rent Lease Obligations 1,170 790 380 — — Total $ 769,662 $ 38,504 $ 155,522 $ 392,710 $ 182,926 (1) As of December 31, 2019 , we had one loan totaling $109.5 million which bore interest at a floating rate. The variable interest rate payments are based on LIBOR plus 1.40% to LIBOR plus 1.90% , which reflects our new interest rates under the 2019 Facility. The information in the table above reflects our projected interest rate obligations for the floating rate payments based on one-month LIBOR as of December 31, 2019 , of 1.76% . (2) The unused commitment fees on the 2019 Facility, payable quarterly, are based on the average daily unused amount of the 2019 Facility. The fees are 0.20% for facility usage greater than 50% or 0.25% for facility usage less than 50% . The information in the table above reflects our projected obligations for the 2019 Facility based on our December 31, 2019 balance of $374.5 million .

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of activity and fair value of interest rate swaps	A summary of our interest rate swap activity is as follows (in thousands): Amount Recognized as Comprehensive Income (Loss) Location of Income (Loss) Recognized in Earnings Amount of Income (Loss) Recognized in Earnings (1) Year ended December 31, 2019 $ (9,828 ) Interest expense $ 1,036 Year ended December 31, 2018 $ 1,192 Interest expense $ 646 Year ended December 31, 2017 $ 2,022 Interest expense $ (1,575 ) (1) There was no ineffective portion of our interest rate swaps recognized in earnings for the years ended December 31, 2019 , 2018 and 2017 . The estimated fair value of our interest rate swaps is as follows (in thousands): December 31, 2019 Balance Sheet Location Estimated Fair Value Prepaid expenses and other assets $ 59 Accounts payable and accrued expenses $ (5,660 ) December 31, 2018 Balance Sheet Location Estimated Fair Value Prepaid expenses and other assets $ 4,286 Accounts payable and accrued expenses $ (59 )

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share	Year Ended December 31, (in thousands, except per share data) 2019 2018 2017 Numerator: Income from continuing operations $ 23,634 $ 21,981 $ 8,588 Less: Net income attributable to noncontrolling interests (511 ) (550 ) (254 ) Distributions paid on unvested restricted shares (41 ) (301 ) (456 ) Income from continuing operations attributable to Whitestone REIT excluding amounts attributable to unvested restricted shares 23,082 21,130 7,878 Income from discontinued operations 594 — — Less: Net income attributable to noncontrolling interests (34 ) — — Income from discontinued operations attributable to Whitestone REIT 560 — — Net income attributable to common shareholders excluding amounts attributable to unvested restricted shares $ 23,642 $ 21,130 $ 7,878 Denominator: Weighted average number of common shares - basic 40,184 39,274 35,428 Effect of dilutive securities: Unvested restricted shares 1,278 1,338 827 Weighted average number of common shares - dilutive 41,462 40,612 36,255 Earnings Per Share: Basic: Income from continuing operations attributable to Whitestone REIT excluding amounts attributable to unvested restricted shares $ 0.57 $ 0.54 $ 0.22 Income from discontinued operations attributable to Whitestone REIT 0.02 0.00 0.00 Net income attributable to common shareholders excluding amounts attributable to unvested restricted shares $ 0.59 $ 0.54 $ 0.22 Diluted: Income from continuing operations attributable to Whitestone REIT excluding amounts attributable to unvested restricted shares $ 0.56 $ 0.52 $ 0.22 Income from discontinued operations attributable to Whitestone REIT 0.01 0.00 0.00 Net income attributable to common shareholders excluding amounts attributable to unvested restricted shares $ 0.57 $ 0.52 $ 0.22

Federal Income Taxes (Tables)

Federal Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Schedule of Characterization of Cash Dividends Distrubuted for Income Tax Purpose	For federal income tax purposes, the cash distributions to shareholders are characterized as follows for the years ended December 31: 2019 2018 2017 Ordinary income (unaudited) 28.6 % 39.1 % 15.3 % Return of capital (unaudited) 19.4 % 26.5 % 84.7 % Capital gain distributions (unaudited) 52.0 % 34.4 % — Total 100.0 % 100.0 % 100.0 %

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	The following table presents the revenue and expenses with Pillarstone OP included in our consolidated statements of operations and comprehensive income for the years ended December 31, 2019 and 2018 (in thousands): Location of Revenue (Expense) 2019 2018 Rent Operating and maintenance $ (813 ) $ (779 ) Property management fee income Management, transaction, and other fees $ 856 $ 1,008 Interest income Interest, dividend and other investment income $ 171 $ 582

Equity (Tables)

Equity (Tables)	12 Months Ended
	Dec. 31, 2019
Stockholders' Equity Note [Abstract]
Schedule of Distributions	The following table reflects the total distributions we have paid (including the total amount paid and the amount paid per share) in each indicated quarter (in thousands, except per share data): Common Shares Noncontrolling OP Unit Holders Total Quarter Paid Distribution Per Common Share Total Amount Paid Distribution Per OP Unit Total Amount Paid Total Amount Paid 2019 Fourth Quarter $ 0.2850 $ 11,580 $ 0.2850 $ 262 $ 11,842 Third Quarter 0.2850 11,430 0.2850 264 11,694 Second Quarter 0.2850 11,316 0.2850 265 11,581 First Quarter 0.2850 11,301 0.2850 264 11,565 Total $ 1.1400 $ 45,627 $ 1.1400 $ 1,055 $ 46,682 2018 Fourth Quarter $ 0.2850 $ 11,302 $ 0.2850 $ 265 $ 11,567 Third Quarter 0.2850 11,294 0.2850 286 11,580 Second Quarter 0.2850 11,203 0.2850 295 11,498 First Quarter 0.2850 11,145 0.2850 309 11,454 Total $ 1.1400 $ 44,944 $ 1.1400 $ 1,155 $ 46,099

Incentive Share Plan (Tables)

Incentive Share Plan (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-Based Incentive Plan Activity	A summary of the share-based incentive plan activity as of and for the year ended December 31, 2019 is as follows: Shares Weighted-Average Grant Date Fair Value (1) Non-vested at January 1, 2019 1,923,382 $ 12.41 Granted 762,630 9.46 Vested (284,964 ) 11.76 Forfeited (61,116 ) 12.62 Non-vested at December 31, 2019 2,339,932 $ 11.52 Available for grant at December 31, 2019 1,792,528 (1) The fair value of the shares granted were determined based on observable market transactions occurring near the date of the grants.
Schedule of Nonvested and Vested Shares Activity	A summary of our nonvested and vested shares activity for the years ended December 31, 2019 , 2018 and 2017 is presented below: Shares Granted Shares Vested Year Ended Non-Vested Shares Issued Weighted-Average Grant-Date Fair Value Vested Shares Total Vest-Date Fair Value (in thousands) Year Ended December 31, 2019 762,630 $ 9.46 (284,964 ) $ 3,352 Year Ended December 31, 2018 653,472 $ 11.07 (560,126 ) $ 7,978 Year Ended December 31, 2017 1,354,534 $ 12.92 (881,710 ) $ 12,829

Selected Quarterly Financial _2

Selected Quarterly Financial Data (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	The following is a summary of our unaudited quarterly financial information for the years ended December 31, 2019 and 2018 (in thousands, except per share data): First Second Third Fourth Quarter Quarter Quarter Quarter 2019 Revenues $ 29,694 $ 29,578 $ 29,879 $ 30,100 Net income $ 2,839 $ 3,404 $ 1,849 $ 16,136 Net income attributable to Whitestone REIT $ 2,774 $ 3,327 $ 1,807 $ 15,776 Basic Earnings per share: Income from continuing operations attributable to Whitestone REIT, excluding amounts attributable to unvested restricted shares (1) $ 0.07 $ 0.06 $ 0.04 $ 0.39 Income from discontinued operations attributable to Whitestone REIT (1) 0.00 0.02 0.00 0.00 Net income attributable to common shareholders, excluding amounts attributable to unvested restricted shares (1) $ 0.07 $ 0.08 $ 0.04 $ 0.39 Diluted Earnings per share: Income from continuing operations attributable to Whitestone REIT, excluding amounts attributable to unvested restricted shares (1) $ 0.07 $ 0.06 $ 0.04 $ 0.38 Income from discontinued operations attributable to Whitestone REIT (1) 0.00 0.02 0.00 (0.01 ) Net income attributable to common shareholders, excluding amounts attributable to unvested restricted shares (1) $ 0.07 $ 0.08 $ 0.04 $ 0.37 2018 Revenues $ 29,785 $ 29,473 $ 30,704 $ 29,901 Net income $ 3,269 $ 2,005 $ 8,033 $ 8,674 Net income attributable to Whitestone REIT $ 3,181 $ 1,954 $ 7,835 $ 8,457 Basic Earnings per share: Net income attributable to common shareholders excluding amounts attributable to unvested restricted shares (1) $ 0.08 $ 0.05 $ 0.20 $ 0.21 Diluted Earnings per share: Net income attributable to common shareholders excluding amounts attributable to unvested restricted shares (1) $ 0.08 $ 0.05 $ 0.19 $ 0.21 (1) The sum of individual quarterly basic and diluted earnings per share amounts may not agree with the year-to-date basic and diluted earning per share amounts as the result of each period’s computation being based on the weighted average number of common shares outstanding during that period.

Description of Business and N_2

Description of Business and Nature of Operations (Details) ft² in Millions	1 Months Ended
	Jul. 31, 2004shares	Dec. 31, 2019ft²property	Dec. 31, 2018ft²property	Dec. 31, 2017property
Real Estate Properties [Line Items]
Reorganization and conversion, number of common shares (in shares) | shares	1.42857
Wholly Owned Properties [Member]
Real Estate Properties [Line Items]
Number of properties		58	57	73
Gross leasable area (in square feet) | ft²		5
Retail Site [Member] | Community Centered Properties™ [Member] | Wholly Owned Properties [Member]
Real Estate Properties [Line Items]
Number of properties		53
Redevelopment, New Acquisitions Portfolio [Member] | Land [Member] | Parcels Held for Future Development [Member] | Wholly Owned Properties [Member]
Real Estate Properties [Line Items]
Number of properties		5
Pillarstone Capital REIT Operating Partnership LP [Member]
Real Estate Properties [Line Items]
Ownership interest		81.40%
Pillarstone Capital REIT Operating Partnership LP [Member] | Unconsolidated Properties [Member]
Real Estate Properties [Line Items]
Number of properties		8	11
Gross leasable area (in square feet) | ft²		0.9	1.3

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Narrative (Details) ft² in Millions	12 Months Ended
	Dec. 31, 2019USD ($)ft²propertyshares	Dec. 31, 2018USD ($)ft²property	Dec. 31, 2017USD ($)	Jan. 01, 2019USD ($)	Jan. 01, 2018USD ($)	May 11, 2017shares	Dec. 31, 2015USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio for class A common stock to OP unit (in shares) | shares	1
Interest expense capitalized	$ 500,000	$ 574,000	$ 439,000
Real estate taxes capitalized	320,000	365,000	277,000
Allowance for doubtful accounts	11,173,000	9,746,000
Bad debt	1,484,000	1,391,000	2,340,000
Fair value of long-term debt	653,700,000	618,600,000
Book value of long-term debt	645,900,000	619,400,000
Operating lease liabilities	1,331,000
Operating lease payments	$ 1,385,000
Lease, weighted average discount rate, percent	4.50%
Operating lease right of use assets	$ 1,328,000
Transaction costs	100,000
2008 Long-Term Equity Incentive Ownership Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 6,500,000	6,800,000	10,400,000
Number of shares authorized (in shares) | shares						3,433,831
Pillarstone Capital REIT Operating Partnership LP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ownership interest	81.40%
Pillarstone Capital REIT Operating Partnership LP [Member] | Level 3 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of long-term debt	$ 100,000	300,000
Book value of long-term debt	$ 100,000	$ 300,000
Unconsolidated Properties [Member] | Pillarstone Capital REIT Operating Partnership LP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of properties | property	8	11
Gross leasable area (in square feet) | ft²	0.9	1.3
Accumulated Deficit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Impact of change in accounting principal					$ 19,100,000
Anthem Marketplace Note [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Face amount of debt							$ 15,100,000
Stated interest rate							4.99%
Building and Building Improvements [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated useful life	5 years
Building and Building Improvements [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated useful life	39 years
TEXAS [Member] | State and Local Jurisdiction [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Applicable tax rate used to determine state margin tax	1.00%
Standard deduction rate used to determine state margin tax	30.00%
Margin Tax Provision Recognized	$ 400,000	$ 400,000	$ 400,000
ASU 2016-02 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Operating lease liabilities				$ 1,100,000
Operating lease payments				$ 1,200,000
Lease, weighted average discount rate, percent				4.50%
Operating lease right of use assets				$ 1,100,000

Marketable Securities (Details)

Marketable Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Marketable securities	$ 0
Proceeds from sales of marketable securities	$ 0	$ 30,000	$ 513,000
Gross realized losses		$ 20,000

Real Estate Narrative (Details)

Real Estate Narrative (Details)	Dec. 06, 2019USD ($)ft²	Nov. 15, 2019USD ($)property	Apr. 24, 2019USD ($)property	Sep. 24, 2018USD ($)	Feb. 27, 2018USD ($)	Dec. 29, 2017USD ($)a	May 26, 2017USD ($)ft²a	May 03, 2017USD ($)ft²	Dec. 31, 2019USD ($)ft²property	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)ft²property	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2019USD ($)ft²property	Dec. 31, 2018USD ($)ft²property	Dec. 31, 2017USD ($)property
Real Estate Properties [Line Items]
Revenues									$ 30,100,000	$ 29,879,000	$ 29,578,000	$ 29,694,000	$ 29,901,000	$ 30,704,000	$ 29,473,000	$ 29,785,000	$ 119,251,000	$ 119,863,000	$ 125,959,000
Net income									$ 15,776,000	1,807,000	$ 3,327,000	$ 2,774,000	$ 8,457,000	$ 7,835,000	$ 1,954,000	$ 3,181,000	23,683,000	21,431,000	8,334,000
Payments to acquire property																	34,804,000	0	125,468,000
Acquisition-related costs																		0	1,600,000
Gain on property dispositions																	$ 638,000	$ 4,547,000	(167,000)
Deferred gain on sale of property																			18,000,000
Hurricane [Member]
Real Estate Properties [Line Items]
Loss from catastrophes																			$ 500,000
Anthem Marketplace Phase II [Member]
Real Estate Properties [Line Items]
Area of real estate property | ft²									6,853								6,853
Concentration Risk, Percentage																	100.00%
Construction costs incurred									$ 1,362,939								$ 1,362,939
Las Colinas Village [Member]
Real Estate Properties [Line Items]
Area of real estate property | ft²	104,919
Concentration Risk, Percentage	86.00%
Revenues																	300,000
Net income																	$ 200,000
Consideration transferred	$ 34,800,000
El Dorado Plaza [Member]
Real Estate Properties [Line Items]
Area of real estate property | ft²								221,577
Concentration Risk, Percentage								96.00%
Area of land (in acres) | a						1.83
Consideration transferred								$ 46,600,000
Payments to acquire property						$ 900,000
BLVD Place [Member]
Real Estate Properties [Line Items]
Area of real estate property | ft²							216,944
Concentration Risk, Percentage							99.00%
Area of land (in acres) | a							1.43
Consideration transferred							$ 158,000,000
Mortgage financing							80,000,000
Cash purchase price							$ 78,000,000
Pinnacle of Scottsdale Phase II [Member]
Real Estate Properties [Line Items]
Area of real estate property | ft²													27,063					27,063
Concentration Risk, Percentage																		100.00%
Construction costs incurred													$ 5,500,000					$ 5,500,000
Capitalized interest and real estate taxes													$ 600,000					$ 600,000
Shops at Starwood Phase III [Member]
Real Estate Properties [Line Items]
Area of real estate property | ft²													35,351					35,351
Concentration Risk, Percentage																		72.00%
Construction costs incurred										8,400,000
Capitalized interest and real estate taxes										$ 1,100,000
Torrey Square [Member]
Real Estate Properties [Line Items]
Proceeds from sale of real estate				$ 8,700,000
Gain on property dispositions				$ 4,400,000
Bellnot Square [Member]
Real Estate Properties [Line Items]
Proceeds from sale of real estate					$ 4,700,000
Gain on property dispositions					$ 300,000
Webster Pointe and Centre South [Member]
Real Estate Properties [Line Items]
Number of properties | property		2
Proceeds from sale of real estate		$ 800,000
Gain on property dispositions		800,000
Deferred gain on sale of property		$ 1,700,000
Zeta, Royal Crest and Featherwood [Member]
Real Estate Properties [Line Items]
Number of properties | property			3
Proceeds from sale of real estate			$ 700,000
Gain on property dispositions			700,000
Deferred gain on sale of property			$ 2,500,000
Wholly Owned Properties [Member]
Real Estate Properties [Line Items]
Number of properties | property									58				57				58	57	73
Gross leasable area (in square feet) | ft²									5,000,000								5,000,000
Parcels Held for Future Development [Member] | Land [Member] | Wholly Owned Properties [Member] | Redevelopment, New Acquisitions Portfolio [Member]
Real Estate Properties [Line Items]
Number of properties | property									5								5

Real Estate Pro Forma Results o

Real Estate Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate [Abstract]
Total revenues	$ 122,286	$ 123,243	$ 137,043
Net income	24,047	21,876	11,217
Net income attributable to Whitestone REIT	$ 23,502	$ 21,326	$ 10,888
Basic Earnings Per Share (in dollars per share)	$ 0.58	$ 0.54	$ 0.28
Diluted Earnings Per Share (in dollars per share)	$ 0.57	$ 0.52	$ 0.27
Weighted-average common shares outstanding:
Basic (in shares)	40,184	39,274	37,933
Diluted (in shares)	41,462	40,612	38,760

Investment in Real Estate Par_3

Investment in Real Estate Partnership - Narrative (Details)	Oct. 08, 2019USD ($)property	Dec. 27, 2018USD ($)property	Dec. 08, 2016USD ($)propertysubsidiary$ / shares	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Variable Interest Entity [Line Items]
Repayments of notes payable				$ 8,095,000	$ 2,543,000	$ 11,543,000
Notes payable				$ 644,699,000	618,205,000
Pillarstone Variable Interest Entity [Member]
Variable Interest Entity [Line Items]
Number of wholly-owned subsidiaries | subsidiary			4
Number of non-core properties | property			14
Consideration amount			$ 84,000,000
Consideration, limited partnership interest			$ 18,100,000
Consideration, limited partnership interest (in dollars per share) | $ / shares			$ 1.331
Liabilities assumed			$ 65,900,000
Property management fee, percent fee			5.00%
Asset management fee, percent fee			0.125%
Pillarstone Variable Interest Entity [Member] | Uptown Tower [Member]
Variable Interest Entity [Line Items]
Property management fee, percent fee			3.00%
Asset management fee, percent fee			0.125%
Pillarstone Variable Interest Entity [Member] | Line of Credit [Member]
Variable Interest Entity [Line Items]
Liabilities assumed			$ 15,500,000
Pillarstone Variable Interest Entity [Member] | Notes Payable [Member] | Uptown Tower Promissory Note [Member]
Variable Interest Entity [Line Items]
Liabilities assumed			16,300,000
Pillarstone Variable Interest Entity [Member] | Notes Payable [Member] | Industrial-Office Promissory Note [Member]
Variable Interest Entity [Line Items]
Liabilities assumed			$ 34,100,000
Pillarstone Capital REIT Operating Partnership LP [Member]
Variable Interest Entity [Line Items]
Ownership interest				81.40%
Notes payable						48,840,000
Amortization of the basis difference between the cost of investment and the Company's share of underlying net book value				$ 108,000	108,000
Pillarstone Capital REIT Operating Partnership LP [Member] | Consolidation, Eliminations [Member]
Variable Interest Entity [Line Items]
Distribution amount	$ 5,400,000
Repayments of notes payable	5,700,000	$ 8,000,000
Notes payable	$ 15,500,000	$ 14,500,000
Pillarstone Capital REIT Operating Partnership LP [Member] | Three Properties in Houston, Texas [Member]
Variable Interest Entity [Line Items]
Number of properties | property	3	3
Proceeds from sale of real estate	$ 39,700,000	$ 15,800,000
Gain on sale of properties recognized	$ 13,800,000	$ 6,300,000
Performance Guarantee [Member]
Variable Interest Entity [Line Items]
Noncontingent liability				$ 462,000
Amortization period				7 years
Amortization of guarantee liability				$ 182,000	$ 106,000	$ 112,000

Investment in Real Estate Par_4

Investment in Real Estate Partnership - Unconsolidated Real Estate Partnership Investments (Details) $ in Thousands, ft² in Millions	Dec. 31, 2019USD ($)ft²property	Dec. 31, 2018USD ($)ft²property	Jan. 01, 2018USD ($)	Dec. 31, 2017USD ($)
Schedule of Equity Method Investments [Line Items]
Investment in real estate partnership	$ 34,097	$ 26,236
Deferred gain on sale of property				$ 18,000
Accounting Standards Update 2017-05 [Member]
Schedule of Equity Method Investments [Line Items]
Impact of change in accounting principal			$ 19,100
Pillarstone Capital REIT Operating Partnership LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	81.40%
Investment in real estate partnership	$ 34,097	$ 26,236
Pillarstone Capital REIT Operating Partnership LP [Member] | Unconsolidated Properties [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | property	8	11
Gross leasable area (in square feet) | ft²	0.9	1.3

Investment in Real Estate Par_5

Investment in Real Estate Partnership - Net Income from Investments in Real Estate Partnerships (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity in earnings of real estate partnership	$ 15,076	$ 8,431	$ 0
Pillarstone Capital REIT Operating Partnership LP [Member]
Schedule of Equity Method Investments [Line Items]
Equity in earnings of real estate partnership	$ 15,076	$ 8,431

Investment in Real Estate Par_6

Investment in Real Estate Partnership - Summarized Financial Information for Investment in Real Estate Partnership - Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Liabilities and equity:
Carrying value of investment in real estate partnership	$ 34,097	$ 26,236
Pillarstone Capital REIT Operating Partnership LP [Member]
Assets:
Real estate, net	50,338	72,661
Other assets	6,742	6,617
Total assets	57,080	79,278
Liabilities and equity:
Notes payable	15,434	47,064
Other liabilities	3,575	4,322
Equity	38,071	27,892
Total liabilities and equity	57,080	79,278
Company’s share of equity	31,008	22,717
Cost of investment in excess of the Company’s share of underlying net book value	3,089	3,519
Carrying value of investment in real estate partnership	$ 34,097	$ 26,236

Investment in Real Estate Par_7

Investment in Real Estate Partnership - Summarized Financial Information for Investment in Real Estate Partnership - Income Statement (Details) - Pillarstone Capital REIT Operating Partnership LP [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Rental revenues	$ 14,253	$ 17,180
Property expenses	(9,045)	(6,687)
Other expenses	(3,449)	(7,848)
Gain on sale of properties or disposal of assets	16,943	7,839
Net income	$ 18,702	$ 10,484

Investment in Real Estate Par_8

Investment in Real Estate Partnership - Certain Assets and Liabilities for Pillarstone OP (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Oct. 08, 2019	Dec. 31, 2018	Dec. 27, 2018	Dec. 31, 2017
Real estate assets, at cost
Property	$ 1,099,955		$ 1,052,238
Accumulated depreciation	(137,933)		(113,300)
Total real estate assets	962,022		938,938
Liabilities:
Notes payable	$ (644,699)		$ (618,205)
Pillarstone Capital REIT Operating Partnership LP [Member]
Real estate assets, at cost
Property					$ 95,146
Accumulated depreciation					(35,980)
Total real estate assets					59,166
Investment in real estate partnership					4,095
Liabilities:
Notes payable					(48,840)
Net carrying value					14,421
Pillarstone Capital REIT Operating Partnership LP [Member] | Consolidation, Eliminations [Member]
Liabilities:
Notes payable		$ (15,500)		$ (14,500)
Pillarstone Capital REIT Operating Partnership LP [Member] | Consolidation, Eliminations [Member]
Liabilities:
Notes payable					$ 15,500

Investment in Real Estate Par_9

Investment in Real Estate Partnership - Maximum Exposure to Loss (Details) $ in Thousands	Dec. 31, 2017USD ($)
Guarantor Obligations [Line Items]
Maximum exposure to loss	$ 66,261
Net carrying value
Guarantor Obligations [Line Items]
Maximum exposure to loss	14,421
OP Unit Purchase Agreement
Guarantor Obligations [Line Items]
Maximum exposure to loss	3,000
Notes payable
Guarantor Obligations [Line Items]
Maximum exposure to loss	$ 48,840

Accrued Rents and Accounts Re_3

Accrued Rents and Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Tenant receivables	$ 16,741	$ 14,686
Accrued rents and other recoveries	16,983	16,423
Other receivables	(11,173)	(9,746)
Other receivables	303	279
Totals	$ 22,854	$ 21,642

Unamortized Lease Commissions_3

Unamortized Lease Commissions, Legal Fees and Loan Costs (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Leasing commissions	$ 9,868	$ 8,789
Deferred legal cost	393	406
Deferred financing cost	3,908	4,076
Total cost	14,169	13,271
Less: leasing commissions accumulated amortization	(4,200)	(3,534)
Less: deferred legal cost accumulated amortization	(179)	(125)
Less: deferred financing cost accumulated amortization	(830)	(2,914)
Total cost, net of accumulated amortization	$ 8,960	$ 6,698

Unamortized Lease Commissions_4

Unamortized Lease Commissions, Legal Fees and Loan Costs (Details 2) $ in Thousands	Dec. 31, 2019USD ($)
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Expected Amortization of Deferred Leasing Commissions Year 2020	$ 1,593
Expected Amortization of Deferred Leasing Commissions Year 2021	1,365
Expected Amortization of Deferred Leasing Commissions Year 2022	1,117
Expected Amortization of Deferred Leasing Commissions Year 2023	853
Expected Amortization of Deferred Leasing Commissions Year 2024	612
Expected Amortization of Deferred Leasing Commissions Thereafter	128
Expected Amortization of Deferred Leasing Commissions	5,668
Expected Amortization of Deferred Legal Costs Year 2020	59
Expected Amortization of Deferred Legal Costs Year 2021	45
Expected Amortization of Deferred Legal Costs Year 2022	35
Expected Amortization of Deferred Legal Costs Year 2023	22
Expected Amortization of Deferred Legal Costs Year 2024	20
Expected Amortization of Deferred Legal Costs Year Thereafter	33
Expected Amortization of Deferred Legal Costs	214
Expected Amortization of Deferred Financing Costs Year 2020	900
Expected Amortization of Deferred Financing Costs Year 2021	900
Expected Amortization of Deferred Financing Costs Year 2022	839
Expected Amortization of Deferred Financing Costs Year 2023	220
Expected Amortization of Deferred Financing Costs Year 2024	192
Expected Amortization of Deferred Financing Costs Thereafter	27
Expected Amortization of Deferred Financing Costs	3,078
Expected Amortization of Deferred Costs Year 2020	2,552
Expected Amortization of Deferred Costs Year 2021	2,310
Expected Amortization of Deferred Costs Year 2022	1,991
Expected Amortization of Deferred Costs Year 2023	1,095
Expected Amortization of Deferred Costs Year 2024	824
Expected Amortization of Deferred Costs Thereafter	188
Expected Amortization of Deferred Costs	$ 8,960

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Lessee, Lease, Description [Line Items]
Lease, weighted average remaining lease term	1 year 8 months 6 days
Lease cost	$ 952
Lease, weighted average discount rate, percent	4.50%
Office Space, Automobile, and Office Machine [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Lease, weighted average remaining lease term	1 year
Office Space, Automobile, and Office Machine [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Lease, weighted average remaining lease term	4 years

Leases - Lessor, Minimum Future

Leases - Lessor, Minimum Future Rent Payments (Topic 842) (Details) $ in Thousands	Dec. 31, 2019USD ($)
Lessor, Operating Lease, Payments, Fiscal Year Maturity (Topic 842) [Abstract]
2020	$ 83,552
2021	72,507
2022	60,766
2023	48,812
2024	36,988
Thereafter	110,496
Total	$ 413,121

Leases - Lessee, Minimum Future

Leases - Lessee, Minimum Future Rent Payments (Topic 842) (Details) $ in Thousands	Dec. 31, 2019USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
2020	$ 919
2021	412
2022	50
2023	4
Total undiscounted rental payments	1,385
Less imputed interest	54
Total lease liabilities	$ 1,331

Leases - Lessee, Minimum Futu_2

Leases - Lessee, Minimum Future Rent Payments (Topic 840) (Details) $ in Thousands	Dec. 31, 2019USD ($)
Operating Leases, Future Minimum Payments Receivable [Abstract]
2019	$ 81,149
2020	70,181
2021	59,550
2022	48,431
2023	37,327
Thereafter	122,102
Total	$ 418,740

Leases - Contractual Obligation

Leases - Contractual Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating Lease Obligations, Total	$ 212	$ 185
Operating Lease Obligations, Less than 1 year (2020)	126	85
Operating Lease Obligations, 1 - 3 years (2021 - 2022)	82	100
Operating Lease Obligations, 3 - 5 years (2023 - 2024)	4	0
Operating Lease Obligations, More than 5 years (after 2024)	0	0
Related Party Rent Lease Obligation, Total	1,170	963
Related Party Rent Lease Obligation, Less than 1 year (2020)	790	441
Related Party Rent Lease Obligation, 1 - 3 years (2021 - 2022)	380	522
Related Party Rent Lease Obligation, 3 - 5 years (2023 - 2024)	0	0
Related Party Rent Lease Obligation, More than 5 years (after 2024)	0	0
Contractual Obligations, Total	769,662	1,148
Contractual Obligations, Less than 1 year (2020)	38,504	526
Contractual Obligations, 1 - 3 years (2021 - 2022)	155,522	622
Contractual Obligations, 3 - 5 years (2023 - 2024)	392,710	0
Contractual Obligations, More than 5 years (after 2024)	$ 182,926	$ 0

Debt (Schedule of Debt) (Detail

Debt (Schedule of Debt) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 25, 2018	Sep. 24, 2018	May 26, 2017	Feb. 04, 2017	Feb. 03, 2017
Debt Instrument [Line Items]
Total notes payable principal	$ 645,896,000		$ 619,444,000
Less deferred financing costs, net of accumulated amortization	(1,197,000)		(1,239,000)
Long-term debt	644,699,000		618,205,000
Fixed Rate Notes [Member] | $10.5 million, 4.85% Note, due September 24, 2020
Debt Instrument [Line Items]
Total notes payable principal	9,260,000		9,500,000
Face amount of debt	$ 10,500,000
Stated interest rate	4.85%
Fixed Rate Notes [Member] | $50.0 million, 1.75% plus 1.35% to 1.90% Note, due October 30, 2020
Debt Instrument [Line Items]
Total notes payable principal	$ 0		50,000,000
Face amount of debt	$ 50,000,000
Imputed interest rate	1.75%
Fixed Rate Notes [Member] | $50.0 million, 1.75% plus 1.35% to 1.90% Note, due October 30, 2020 | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.35%
Fixed Rate Notes [Member] | $50.0 million, 1.75% plus 1.35% to 1.90% Note, due October 30, 2020 | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.90%
Fixed Rate Notes [Member] | $50.0 million, 1.50% plus 1.35% to 1.90% Note, due January 29, 2021
Debt Instrument [Line Items]
Total notes payable principal	$ 0		50,000,000
Face amount of debt	$ 50,000,000
Imputed interest rate	1.50%
Fixed Rate Notes [Member] | $50.0 million, 1.50% plus 1.35% to 1.90% Note, due January 29, 2021 | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.35%
Fixed Rate Notes [Member] | $50.0 million, 1.50% plus 1.35% to 1.90% Note, due January 29, 2021 | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.90%
Fixed Rate Notes [Member] | $100.0 million, 1.73% plus 1.65% to 2.25% Note, due October 30, 2022
Debt Instrument [Line Items]
Total notes payable principal	$ 100,000,000		100,000,000
Face amount of debt	$ 100,000,000
Imputed interest rate	1.73%
Fixed Rate Notes [Member] | $100.0 million, 1.73% plus 1.65% to 2.25% Note, due October 30, 2022 | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.35%
Fixed Rate Notes [Member] | $100.0 million, 1.73% plus 1.65% to 2.25% Note, due October 30, 2022 | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.90%
Fixed Rate Notes [Member] | $165.0 million, 2.24% plus 1.35% to 1.90% Note, due January 31, 2024
Debt Instrument [Line Items]
Total notes payable principal	$ 165,000,000		0
Face amount of debt	$ 165,000,000
Imputed interest rate	2.24%
Fixed Rate Notes [Member] | $165.0 million, 2.24% plus 1.35% to 1.90% Note, due January 31, 2024 | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.35%
Fixed Rate Notes [Member] | $165.0 million, 2.24% plus 1.35% to 1.90% Note, due January 31, 2024 | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.90%
Fixed Rate Notes [Member] | $80.0 million, 3.72% Note, due June 1, 2027
Debt Instrument [Line Items]
Total notes payable principal	$ 80,000,000		80,000,000
Face amount of debt	$ 80,000,000					$ 80,000,000
Stated interest rate	3.72%					3.72%
Fixed Rate Notes [Member] | $6.5 million 3.80% Note, due January 1, 2019
Debt Instrument [Line Items]
Total notes payable principal	$ 0		5,657,000
Face amount of debt	$ 6,500,000
Stated interest rate	3.80%
Fixed Rate Notes [Member] | $19.0 million 4.15% Note, due December 1, 2024
Debt Instrument [Line Items]
Total notes payable principal	$ 19,000,000		19,000,000
Face amount of debt	$ 19,000,000
Stated interest rate	4.15%
Fixed Rate Notes [Member] | $20.2 million 4.28% Note, due June 6, 2023
Debt Instrument [Line Items]
Total notes payable principal	$ 18,616,000		18,996,000
Face amount of debt	$ 20,200,000
Stated interest rate	4.28%
Fixed Rate Notes [Member] | $14.0 million 4.34% Note, due September 11, 2024
Debt Instrument [Line Items]
Total notes payable principal	$ 13,482,000		13,718,000
Face amount of debt	$ 14,000,000
Stated interest rate	4.34%
Fixed Rate Notes [Member] | $14.3 million 4.34% Note, due September 11, 2024
Debt Instrument [Line Items]
Total notes payable principal	$ 14,243,000		14,300,000
Face amount of debt	$ 14,300,000
Stated interest rate	4.34%
Fixed Rate Notes [Member] | $15.1 million 4.99% Note, due January 6, 2024
Debt Instrument [Line Items]
Total notes payable principal	$ 14,409,000		14,643,000
Face amount of debt	$ 15,100,000
Stated interest rate	4.99%
Fixed Rate Notes [Member] | $2.6 million 5.46% Note, due October 1, 2023
Debt Instrument [Line Items]
Total notes payable principal	$ 2,386,000		2,430,000
Face amount of debt	$ 2,600,000
Stated interest rate	5.46%
Fixed Rate Notes [Member] | $50.0 million, 5.09% Note, due March 22, 2029
Debt Instrument [Line Items]
Total notes payable principal	$ 50,000,000		0
Face amount of debt	$ 50,000,000
Stated interest rate	5.09%
Fixed Rate Notes [Member] | $50.0 million, 5.17% Note, due March 22, 2029
Debt Instrument [Line Items]
Total notes payable principal	$ 50,000,000		0
Face amount of debt	$ 50,000,000
Stated interest rate	5.17%
Floating Rate Notes [Member]
Debt Instrument [Line Items]
Long-term debt	$ 109,500,000
Floating Rate Notes [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.40%
Floating Rate Notes [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.90%
Floating Rate Notes [Member] | Unsecured line of credit, LIBOR plus 1.40% to 1.90%, due January 31, 2023 | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Total notes payable principal	$ 109,500,000		$ 241,200,000
Floating Rate Notes [Member] | Unsecured line of credit, LIBOR plus 1.40% to 1.90%, due January 31, 2023 | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.40%
Floating Rate Notes [Member] | Unsecured line of credit, LIBOR plus 1.40% to 1.90%, due January 31, 2023 | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.90%
Interest Rate Swap [Member] | $10.5 million, 4.85% Note, due September 24, 2020
Debt Instrument [Line Items]
Stated interest rate				4.85%	3.55%
Interest Rate Swap [Member] | $50.0 million, 1.75% plus 1.35% to 1.90% Note, due October 30, 2020
Debt Instrument [Line Items]
Stated interest rate							1.75%	0.84%
Interest Rate Swap [Member] | $50.0 million, 1.50% plus 1.35% to 1.90% Note, due January 29, 2021
Debt Instrument [Line Items]
Stated interest rate		1.50%
Interest Rate Swap [Member] | $100.0 million, 1.73% plus 1.65% to 2.25% Note, due October 30, 2022
Debt Instrument [Line Items]
Stated interest rate		1.73%
Interest Rate Swap [Member] | $165.0 million, 2.24% plus 1.35% to 1.90% Note, due January 31, 2024
Debt Instrument [Line Items]
Stated interest rate		2.24%

Debt (Narrative) (Details)

Debt (Narrative) (Details)	Mar. 22, 2019USD ($)	Jan. 31, 2019USD ($)	Nov. 07, 2014USD ($)	Dec. 31, 2019USD ($)property	May 26, 2017USD ($)
Debt Instrument [Line Items]
Secured Debt				$ 171,400,000
Number of collateralized properties | property				8
Carrying value of collateralized properties				$ 270,400,000
Series A [Member]
Debt Instrument [Line Items]
Annual principal payments	$ 7,100,000
Series B [Member]
Debt Instrument [Line Items]
Annual principal payments	10,000,000
2019 Facility [Member]
Debt Instrument [Line Items]
Credit facility, covenant, total debt to total assets ratio, maximum		0.60
Credit facility, covenant, secured debt to total assets ratio, maximum		0.40
Credit facility, covenant, EBITDA to fixed charges ratio, minimum		1.50
Credit facility, covenant, other recourse debt to total assets ratio, maximum		0.15
Credit facility, covenant, tangible net worth threshold before percentage of aggregate net proceeds, amount		$ 372,000,000
Credit facility, covenant, tangible net worth, percentage of aggregate net proceeds, minimum		75.00%
Interest rate at period end				3.35%
Repayments of long-term debt		$ 446,200,000
Senior Notes [Member]
Debt Instrument [Line Items]
Face amount of debt	100,000,000
Period principal payment	$ 1,000,000
Credit facility, covenant, total debt to total assets ratio, maximum	0.60
Credit facility, covenant, secured debt to total assets ratio, maximum	0.40
Credit facility, covenant, EBITDA to fixed charges ratio, minimum	1.50
Credit facility, covenant, other recourse debt to total assets ratio, maximum	0.15
Credit facility, covenant, tangible net worth threshold before percentage of aggregate net proceeds, amount	$ 372,000,000
Credit facility, covenant, tangible net worth, percentage of aggregate net proceeds, minimum	75.00%
Senior Notes [Member] | Series A [Member]
Debt Instrument [Line Items]
Face amount of debt	$ 50,000,000
Stated interest rate	5.09%
Senior Notes [Member] | Series B [Member]
Debt Instrument [Line Items]
Face amount of debt	$ 50,000,000
Stated interest rate	5.17%
Floating Rate Notes [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate				1.40%
Floating Rate Notes [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate				1.90%
Floating Rate Notes [Member] | One-month LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate				1.76%
Fixed Rate Notes [Member] | $80.0 million, 3.72% Note, due June 1, 2027
Debt Instrument [Line Items]
Face amount of debt				$ 80,000,000	$ 80,000,000
Stated interest rate				3.72%	3.72%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, amount outstanding				$ 374,500,000
Revolving Credit Facility [Member] | The Revolver [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity			$ 300,000,000
Revolving Credit Facility [Member] | 2018 Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.95%
Revolving Credit Facility [Member] | 2019 Facility [Member]
Debt Instrument [Line Items]
Credit facility, amount outstanding				374,500,000
Credit facility, remaining borrowing capacity				$ 140,500,000
Revolving Credit Facility [Member] | 2019 Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Revolving Credit Facility [Member] | 2019 Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.40%
Revolving Credit Facility [Member] | 2019 Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.90%
Term Loan [Member] | Term Loan 3 [Member]
Debt Instrument [Line Items]
Face amount of debt			$ 100,000,000
Term Loan [Member] | Term Loan 1 [Member]
Debt Instrument [Line Items]
Face amount of debt			50,000,000
Term Loan [Member] | Term Loan 2 [Member]
Debt Instrument [Line Items]
Face amount of debt			$ 50,000,000
Term Loan [Member] | 2018 Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			2.25%
Term Loan [Member] | 2019 Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.35%
Term Loan [Member] | 2019 Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.90%
Term Loan [Member] | Unsecured Line of Credit [Member] | Term Loan A [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		165,000,000
Term Loan [Member] | Unsecured Line of Credit [Member] | Term Loan B [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		100,000,000
Revolving Credit Facility [Member] | 2019 Facility [Member]
Debt Instrument [Line Items]
Credit facility, accordion feature, increase limit		200,000,000
Revolving Credit Facility [Member] | Unsecured Line of Credit [Member] | 2019 Revolver [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		$ 250,000,000

Debt (Schedule of Maturities of

Debt (Schedule of Maturities of Debt) (Details) $ in Thousands	Dec. 31, 2019USD ($)
Debt Disclosure [Abstract]
2020	$ 10,951
2021	1,611
2022	101,683
2023	137,363
2024	228,573
Thereafter	165,715
Long-Term Debt - Principal, Total	$ 645,896

Debt (Contractual Obligations)

Debt (Contractual Obligations) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)loan	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Long-Term Debt - Principal, Total	$ 645,896
Long-Term Debt - Principal, Less than 1 year (2020)	10,951
Long-Term Debt - Principal, 1 - 3 years (2021 - 2022)	103,294
Long-Term Debt - Principal, 3 - 5 years (2023 - 2024)	365,936
Long-Term Debt - Principal, More than 5 years (after 2024)	165,715
Long-Term Debt - Fixed Interest, Total	107,674
Long-Term Debt - Fixed Interest, Less than 1 year (2020)	21,742
Long-Term Debt - Fixed Interest, 1 - 3 years (2021 - 2022)	41,975
Long-Term Debt - Fixed Interest, 3 - 5 years (2023 - 2024)	26,746
Long-Term Debt - Fixed Interest, More than 5 years (after 2024)	17,211
Long-Term Debt - Variable Interest, Total	13,633
Long-Term Debt - Variable Interest, Less than 1 year (2020)	4,544
Long-Term Debt - Variable Interest, 1 - 3 years (2021 - 2022)	9,089
Long-Term Debt - Variable Interest, 3 - 5 years (2023 - 2024)	0
Long-Term Debt - Variable Interest, More than 5 years (after 2024)	0
Unsecured revolving credit facility - Unused commitment fee, Total	1,077
Unsecured revolving credit facility - Unused commitment fee, Less than 1 year (2020)	351
Unsecured revolving credit facility - Unused commitment fee, 1 - 3 years (2021 - 2022)	702
Unsecured revolving credit facility - Unused commitment fee, 3 - 5 years (2023 - 2024)	24
Unsecured revolving credit facility - Unused commitment fee, More than 5 years (after 2024)	0
Operating Lease Obligations, Total	212	$ 185
Operating Lease Obligations, Less than 1 year (2020)	126	85
Operating Lease Obligations, 1 - 3 years (2021 - 2022)	82	100
Operating Lease Obligations, 3 - 5 years (2023 - 2024)	4	0
Operating Lease Obligations, More than 5 years (after 2024)	0	0
Related Party Rent Lease Obligation, Total	1,170	963
Related Party Rent Lease Obligation, Less than 1 year (2020)	790	441
Related Party Rent Lease Obligation, 1 - 3 years (2021 - 2022)	380	522
Related Party Rent Lease Obligation, 3 - 5 years (2023 - 2024)	0	0
Related Party Rent Lease Obligation, More than 5 years (after 2024)	0	0
Contractual Obligations, Total	769,662	1,148
Contractual Obligations, Less than 1 year (2020)	38,504	526
Contractual Obligations, 1 - 3 years (2021 - 2022)	155,522	622
Contractual Obligations, 3 - 5 years (2023 - 2024)	392,710	0
Contractual Obligations, More than 5 years (after 2024)	182,926	0
Long-term debt	$ 644,699	$ 618,205
Minimum [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.20%
Facility usage	50.00%
Maximum [Member]
Debt Instrument [Line Items]
Commitment fee percentage	0.25%
Facility usage	50.00%
Floating Rate Notes [Member]
Debt Instrument [Line Items]
Number of loans | loan	1
Long-term debt	$ 109,500
Floating Rate Notes [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.40%
Floating Rate Notes [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.90%
Floating Rate Notes [Member] | One-month LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.76%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, amount outstanding	$ 374,500

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 05, 2018	Nov. 19, 2015
Interest Rate Swap [Member] | Interest Expense [Member]
Derivative [Line Items]
Amount Recognized as Comprehensive Income (Loss)		$ (9,828)	$ 1	$ 2,022
Amount of Gain (Loss) Recognized in Earnings		1,036	646	$ (1,575)
Interest Rate Swap [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivative [Line Items]
Estimated fair value		59	4,286
Interest Rate Swap [Member] | Accounts Payable and Accrued Expenses [Member]
Derivative [Line Items]
Estimated fair value		$ (5,660)	$ (59)
Term Loan 3 [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Fixed interest rate							1.725%
Term Loan 3 [Member] | U.S. Bank National Association [Member]
Derivative [Line Items]
Swap amount assigned to counterparty					$ 35,000
Term Loan 3 [Member] | SunTrust Bank [Member]
Derivative [Line Items]
Swap amount assigned to counterparty					15,000
Term Loan 1 [Member]
Derivative [Line Items]
Swap amount assigned to counterparty					14,000
Term Loan 1 [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Fixed interest rate							1.75%
Term Loan 1 [Member] | U.S. Bank National Association [Member]
Derivative [Line Items]
Swap amount assigned to counterparty					6,500
Term Loan 1 [Member] | Wells Fargo Bank, National Association [Member]
Derivative [Line Items]
Swap amount assigned to counterparty					14,000
Term Loan 1 [Member] | SunTrust Bank [Member]
Derivative [Line Items]
Swap amount assigned to counterparty					5,000
Term Loan 1 [Member] | Regions Bank [Member]
Derivative [Line Items]
Swap amount assigned to counterparty					3,800
Term Loan 2 [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Fixed interest rate							1.502%
Term Loan 2 [Member] | U.S. Bank National Association [Member]
Derivative [Line Items]
Swap amount assigned to counterparty					6,500
Term Loan 2 [Member] | Wells Fargo Bank, National Association [Member]
Derivative [Line Items]
Swap amount assigned to counterparty					14,000
Term Loan 2 [Member] | Bank of American, N.A. [Member]
Derivative [Line Items]
Swap amount assigned to counterparty					14,000
Term Loan 2 [Member] | SunTrust Bank [Member]
Derivative [Line Items]
Swap amount assigned to counterparty					5,000
Term Loan 2 [Member] | Regions Bank [Member]
Derivative [Line Items]
Swap amount assigned to counterparty					$ 3,800
Terravita Marketplace [Member] | Extension Loan [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Fixed interest rate						2.85%
Derivative, amount of hedged item						$ 9,600
February 7, 2019 [Member] | Term Loan A [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Fixed interest rate	2.43%
February 7, 2019 [Member] | Term Loan A [Member] | Bank Of Montreal [Member]
Derivative [Line Items]
Swap amount assigned to counterparty	$ 65,000
February 7, 2019 [Member] | Term Loan A [Member] | U.S. Bank National Association [Member]
Derivative [Line Items]
Swap amount assigned to counterparty	12,900
February 7, 2019 [Member] | Term Loan A [Member] | Wells Fargo Bank, National Association [Member]
Derivative [Line Items]
Swap amount assigned to counterparty	5,900
February 7, 2019 [Member] | Term Loan A [Member] | SunTrust Bank [Member]
Derivative [Line Items]
Swap amount assigned to counterparty	15,700
February 7, 2019 [Member] | Term Loan A [Member] | Regions Bank [Member]
Derivative [Line Items]
Swap amount assigned to counterparty	$ 11,600
November 9, 2020 [Member] | Term Loan A [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Fixed interest rate	2.43%
November 9, 2020 [Member] | Term Loan A [Member] | Bank Of Montreal [Member]
Derivative [Line Items]
Swap amount assigned to counterparty	$ 115,000
November 9, 2020 [Member] | Term Loan A [Member] | U.S. Bank National Association [Member]
Derivative [Line Items]
Swap amount assigned to counterparty	22,700
November 9, 2020 [Member] | Term Loan A [Member] | Wells Fargo Bank, National Association [Member]
Derivative [Line Items]
Swap amount assigned to counterparty	10,500
November 9, 2020 [Member] | Term Loan A [Member] | SunTrust Bank [Member]
Derivative [Line Items]
Swap amount assigned to counterparty	27,900
November 9, 2020 [Member] | Term Loan A [Member] | Regions Bank [Member]
Derivative [Line Items]
Swap amount assigned to counterparty	$ 20,500
February 8, 2021 [Member] | Term Loan A [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Fixed interest rate	2.43%
February 8, 2021 [Member] | Term Loan A [Member] | Bank Of Montreal [Member]
Derivative [Line Items]
Swap amount assigned to counterparty	$ 165,000
February 8, 2021 [Member] | Term Loan A [Member] | U.S. Bank National Association [Member]
Derivative [Line Items]
Swap amount assigned to counterparty	32,600
February 8, 2021 [Member] | Term Loan A [Member] | Wells Fargo Bank, National Association [Member]
Derivative [Line Items]
Swap amount assigned to counterparty	15,000
February 8, 2021 [Member] | Term Loan A [Member] | SunTrust Bank [Member]
Derivative [Line Items]
Swap amount assigned to counterparty	40,000
February 8, 2021 [Member] | Term Loan A [Member] | Regions Bank [Member]
Derivative [Line Items]
Swap amount assigned to counterparty	$ 29,400

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Income from continuing operations									$ 23,634	$ 21,981	$ 8,588
Less: Net income attributable to noncontrolling interests									(511)	(550)	(254)
Distributions paid on unvested restricted shares									(41)	(301)	(456)
Income from continuing operations attributable to Whitestone REIT excluding amounts attributable to unvested restricted shares									23,082	21,130	7,878
Net income from discontinued operations									594	0	0
Less: Net income attributable to noncontrolling interests									(34)	0	0
Income from discontinued operations attributable to Whitestone REIT									560	0	0
Net income attributable to common shareholders excluding amounts attributable to unvested restricted shares									$ 23,642	$ 21,130	$ 7,878
Denominator:
Weighted average number of common shares - basic									40,184,000	39,274,000	35,428,000
Effect of dilutive securities:
Unvested restricted shares									1,278,000	1,338,000	827,000
Weighted average number of common shares - dilutive									41,462,000	40,612,000	36,255,000
Basic:
Income from continuing operations attributable to Whitestone REIT, excluding amounts attributable to unvested restricted shares (in dollars per share)									$ 0.57	$ 0.54	$ 0.22
Income from discontinued operations attributable to Whitestone REIT (in dollars per share)									0.02	0	0
Net income attributable to common shareholders, excluding amounts attributable to unvested restricted shares (in dollars per share)	$ 0.39	$ 0.04	$ 0.08	$ 0.07	$ 0.21	$ 0.20	$ 0.05	$ 0.08	0.59	0.54	0.22
Diluted:
Income from continuing operations attributable to Whitestone REIT, excluding amounts attributable to unvested restricted shares (in dollars per share)									0.56	0.52	0.22
Income from discontinued operations attributable to Whitestone REIT (in dollars per share)									0.01	0	0
Net income attributable to common shareholders, excluding amounts attributable to unvested restricted shares (in dollars per share)	$ 0.37	$ 0.04	$ 0.08	$ 0.07	$ 0.21	$ 0.19	$ 0.05	$ 0.08	$ 0.57	$ 0.52	$ 0.22
OP Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
OP units excluded from diluted earnings per share because their effect would be anti-dilutive (in shares)									924,314	1,011,268	1,088,292
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Distributions to holders of certain restricted common shares									$ 41	$ 317	$ 472
Distributions to holders of certain restricted common shares charged against earnings									$ 0	$ 16	$ 16

Federal Income Taxes (Details)

Federal Income Taxes (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Ordinary income (unaudited)	28.60%	39.10%	15.30%
Return of capital (unaudited)	19.40%	26.50%	84.70%
Capital gain distributions (unaudited)	52.00%	34.40%	0.00%
Total	100.00%	100.00%	100.00%

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 08, 2016
Related Party Transaction [Line Items]
Financed receivable due from related party	$ 0	$ 5,661
Beneficial Owner [Member] | Mr. James C. Mastandrea [Member]
Related Party Transaction [Line Items]
Ownership percentage	78.60%
Beneficial Owner [Member] | Mr. John J. Dee [Member]
Related Party Transaction [Line Items]
Ownership percentage	26.80%
Pillarstone OP [Member]
Related Party Transaction [Line Items]
Financed receivable due from related party			$ 15,400
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Pillarstone OP [Member]
Related Party Transaction [Line Items]
Financing receivable, basis spread on variable rate			1.40%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Pillarstone OP [Member]
Related Party Transaction [Line Items]
Financing receivable, basis spread on variable rate			1.95%

Related Party Transactions - Re

Related Party Transactions - Revenue and Expenses (Details) - Pillarstone OP [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating and maintenance
Related Party Transaction [Line Items]
Rent	$ (813)	$ (779)
Management, transaction, and other fees
Related Party Transaction [Line Items]
Property management fee income	856	1,008
Interest, dividend and other investment income
Related Party Transaction [Line Items]
Interest income	$ 171	$ 582

Equity (Details)

Equity (Details) $ / shares in Units, $ in Thousands	Apr. 25, 2017USD ($)$ / sharesshares	Dec. 31, 2019USD ($)$ / sharesshares	Sep. 30, 2019USD ($)$ / shares	Jun. 30, 2019USD ($)$ / shares	Mar. 31, 2019USD ($)$ / shares	Dec. 31, 2018USD ($)$ / sharesshares	Sep. 30, 2018USD ($)$ / shares	Jun. 30, 2018USD ($)$ / shares	Mar. 31, 2018USD ($)$ / shares	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2017USD ($)	Jun. 04, 2015USD ($)agreement
Class of Stock [Line Items]
Common shares, authorized (in shares)		400,000,000				400,000,000				400,000,000	400,000,000
Common shares, par value per share (in dollars per share) | $ / shares		$ 0.001				$ 0.001				$ 0.001	$ 0.001
Preferred shares, shares authorized (in shares)		50,000,000				50,000,000				50,000,000	50,000,000
Preferred shares, par value per share (in dollars per share) | $ / shares		$ 0.001				$ 0.001				$ 0.001	$ 0.001
Proceeds from issuance of common shares, net of offering costs | $										$ 21,244	$ 0	$ 118,412
Number of equity distribution agreements | agreement													9
Amount authorized | $													$ 50,000
Common shares, issued (in shares)		41,492,117				39,778,029				41,492,117	39,778,029
Ownership interest in operating partnership										97.90%
Conversion ratio for class A common stock to OP unit (in shares)		1								1
Weighted-average share ownership in operating partnership										97.70%	97.50%	97.00%
Payments of exchange offer costs | $										$ 120	$ 126	$ 0
OP Units [Member]
Class of Stock [Line Items]
OP units outstanding (in shares)		42,279,849				40,585,688				42,279,849	40,585,688
Conversion of stock, shares converted (in shares)										19,909	155,100
OP units owned (in shares)		41,371,277				39,657,207				41,371,277	39,657,207
Cash Distribution [Member]
Class of Stock [Line Items]
Total Amount Paid | $		$ 11,842	$ 11,694	$ 11,581	$ 11,565	$ 11,567	$ 11,580	$ 11,498	$ 11,454	$ 46,682	$ 46,099
Cash Distribution [Member] | Common Stock [Member]
Class of Stock [Line Items]
Distribution Per Common Share (in dollars per share) | $ / shares		$ 0.2850	$ 0.2850	$ 0.2850	$ 0.2850	$ 0.2850	$ 0.2850	$ 0.2850	$ 0.2850	$ 1.1400	$ 1.1400
Total Amount Paid | $		$ 11,580	$ 11,430	$ 11,316	$ 11,301	$ 11,302	$ 11,294	$ 11,203	$ 11,145	$ 45,627	$ 44,944
Cash Distribution [Member] | OP Units [Member]
Class of Stock [Line Items]
Distribution Per Common Share (in dollars per share) | $ / shares		$ 0.2850	$ 0.2850	$ 0.2850	$ 0.2850	$ 0.2850	$ 0.2850	$ 0.2850	$ 0.2850	$ 1.1400	$ 1.1400
Total Amount Paid | $		$ 262	$ 264	$ 265	$ 264	$ 265	$ 286	$ 295	$ 309	$ 1,055	$ 1,155
Private Placement [Member]
Class of Stock [Line Items]
Issuance of commons shares (in shares)	8,018,500
Share price of equity offering (in dollars per share) | $ / shares	$ 13
Proceeds from issuance of common shares, net of offering costs | $	$ 99,900
Over-Allotment Option [Member]
Class of Stock [Line Items]
Issuance of commons shares (in shares)	1,018,500
2015 Equity Distribution Agreement [Member]
Class of Stock [Line Items]
Issuance of commons shares (in shares)										0	1,324,038
Proceeds from issuance | $											$ 18,600
Payments of exchange offer costs | $											$ 300

Incentive Share Plan (Narrative

Incentive Share Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions

Jan. 01, 2020

Dec. 01, 2018

Sep. 06, 2017

Jun. 30, 2016

Jun. 30, 2015

Apr. 02, 2014

Jun. 30, 2019

Sep. 30, 2019

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

May 11, 2017

Dec. 22, 2010

Restricted Common Shares and Restricted Share Units [Member] | Time-Based Vesting [Member]

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

Non-option equity instruments granted (in shares)

320,000

143,000

Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member]

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

Award vesting period

24 months

Restricted stock granted (in shares)

229,684

267,783

Performance period

3 years

3 years

Grant date fair value (in dollars per share)

$ 14.89

$ 12.37

Unrecognized compensation cost

$ 4.2

Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member] | Minimum [Member]

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

Award vesting percentage

0.00%

Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member] | Maximum [Member]

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

Award vesting percentage

200.00%

200.00%

Restricted Stock [Member] | Immediate Vesting (CIC Units) [Member]

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

Restricted stock granted (in shares)

965,000

895,000

Grant date fair value (in dollars per share)

$ 13.05

Performance Shares [Member]

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

Award vesting period

33 months

2008 Long-Term Equity Incentive Ownership Plan [Member]

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

Percentage of maximum number of shares issued under plan to aggregate shares (as a percent)

12.50%

Share-based compensation expense

$ 6.5

$ 6.8

$ 10.4

Unrecognized compensation cost

$ 8.4

Number of shares authorized (in shares)

3,433,831

2008 Long-Term Equity Incentive Ownership Plan [Member] | Time-Based Vesting [Member] | Minimum [Member]

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

Award vesting period

1 year

2008 Long-Term Equity Incentive Ownership Plan [Member] | Time-Based Vesting [Member] | Maximum [Member]

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

Award vesting period

2 years

2008 Long-Term Equity Incentive Ownership Plan [Member] | Restricted Common Shares and Restricted Share Units [Member]

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

Award vesting percentage

100.00%

2008 Long-Term Equity Incentive Ownership Plan [Member] | Restricted Common Shares and Restricted Share Units [Member] | Time and Performance-Based Vesting [Member]

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

Non-option equity instruments granted (in shares)

633,704

2008 Long-Term Equity Incentive Ownership Plan [Member] | Restricted Common Shares and Restricted Share Units [Member] | Performance Vesting [Member]

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

Non-option equity instruments granted (in shares)

2,049,116

2008 Long-Term Equity Incentive Ownership Plan [Member] | Non-Vested Time Based Shares [Member]

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

Unrecognized compensation cost

$ 4.2

Period from recognition

33 months

2008 Long-Term Equity Incentive Ownership Plan [Member] | Non-Cash Share Based Compensation in 2014 [Member]

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

Period from recognition

23 months

2018 Long-Term Equity Incentive Ownership Plan [Member] | Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member]

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

Restricted stock granted (in shares)

405,417

Performance period

3 years

Grant date fair value (in dollars per share)

$ 8.22

2018 Long-Term Equity Incentive Ownership Plan [Member] | Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member] | Minimum [Member]

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

Award vesting percentage

0.00%

2018 Long-Term Equity Incentive Ownership Plan [Member] | Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member] | Maximum [Member]

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

Award vesting percentage

200.00%

2018 Long-Term Equity Incentive Ownership Plan [Member] | Time-Based Restricted Units [Member]

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

Restricted stock granted (in shares)

317,184

17,069

Performance period

3 years

Grant date fair value (in dollars per share)

$ 10.63

$ 11.69

Shares Issued 2017 [Member] | Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member]

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

Award vesting percentage

200.00%

Shared Issued 2018 [Member] | Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member]

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

Award vesting percentage

100.00%

Shares issued 2019 [Member] | Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member]

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

Award vesting percentage

50.00%

Subsequent Event [Member] | Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member]

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

Stock granted to trustees, vested in period (in shares)

247,978

Subsequent Event [Member] | Restricted Stock [Member] | Market-Based Vesting (TSR Units) [Member] | Maximum [Member]

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

Award vesting percentage

200.00%

Subsequent Event [Member] | Common Stock [Member] | Market-Based Vesting (TSR Units) [Member]

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

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease)

495,956

Incentive Share Plan (Schedule

Incentive Share Plan (Schedule of Share-Based Incentive Plan Activity) (Details) - 2008 Long-Term Equity Incentive Ownership Plan [Member] - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shares
Non-vested, beginning balance (in shares)	1,923,382
Granted (in shares)	762,630	653,472	1,354,534
Vested (in shares)	(284,964)	(560,126)	(881,710)
Forfeited (in shares)	(61,116)
Non-vested, ending balance (in shares)	2,339,932	1,923,382
Available for grant (in shares)	1,792,528
Weighted-Average Grant Date Fair Value
Non-vested, beginning balance (in dollars per share)	$ 12.41
Granted (in dollars per share)	9.46	$ 11.07	$ 12.92
Vested (in dollars per share)	11.76
Forfeited (in dollars per share)	12.62
Non-vested, ending balance (in dollars per share)	$ 11.52	$ 12.41

Incentive Share Plan (Schedul_2

Incentive Share Plan (Schedule of Nonvested and Vested Shares Activity) (Details) - 2008 Long-Term Equity Incentive Ownership Plan [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-Vested Shares Issued (in shares)	762,630	653,472	1,354,534
Weighted Average Grant Date Fair Value (in dollars per share)	$ 9.46	$ 11.07	$ 12.92
Vested Shares (in shares)	(284,964)	(560,126)	(881,710)
Total Vest-Date Fair Value	$ 3,352	$ 7,978	$ 12,829

Grants to Trustees (Details)

Grants to Trustees (Details)	Dec. 12, 2019trustee$ / sharesshares	Dec. 28, 2018trustee$ / sharesshares	Dec. 12, 2017trustee$ / sharesshares
Individual Trustee Grant Agreements 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of independent trustees | trustee	6	6	6
Number of trustee emeritus | trustee	1	1	1
Individual Trustee Grant Agreements 1 [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock granted to trustees (in shares) | shares	19,562	21,000	16,281
Stock granted to trustees, vested in period (in shares) | shares	3,000	3,000	3,000
Stock granted to trustees, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 13.54	$ 12.42	$ 14.46
Individual Trustee Grant Agreements 2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of independent trustees | trustee	2	2	3
Individual Trustee Grant Agreements 2 [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock granted to trustees (in shares) | shares	3,398	4,186	2,320
Stock granted to trustees, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 13.54	$ 12.42	$ 14.46

Commitments and Contingencies C

Commitments and Contingencies Commitments and Contingencies (Details) $ in Millions	1 Months Ended
	May 31, 2019USD ($)
Clark v. Whitestone REIT, et al. [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Damages sought, value	$ 2.7

Selected Quarterly Financial _3

Selected Quarterly Financial Data (unaudited) - Unaudited Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 30,100	$ 29,879	$ 29,578	$ 29,694	$ 29,901	$ 30,704	$ 29,473	$ 29,785	$ 119,251	$ 119,863	$ 125,959
Net income	16,136	1,849	3,404	2,839	8,674	8,033	2,005	3,269	24,228	21,981	8,588
Net income (loss) attributable to Whitestone REIT	$ 15,776	$ 1,807	$ 3,327	$ 2,774	$ 8,457	$ 7,835	$ 1,954	$ 3,181	$ 23,683	$ 21,431	$ 8,334
Basic Earnings Per Share:
Income from continuing operations attributable to Whitestone REIT, excluding amounts attributable to unvested restricted shares (in dollars per share)	$ 0.39	$ 0.04	$ 0.06	$ 0.07
Income from discontinued operations attributable to Whitestone REIT (in dollars per share)	0	0	0.02	0
Net income attributable to common shareholders, excluding amounts attributable to unvested restricted shares (in dollars per share)	0.39	0.04	0.08	0.07	$ 0.21	$ 0.20	$ 0.05	$ 0.08	$ 0.59	$ 0.54	$ 0.22
Diluted Earnings Per Share:
Income from continuing operations attributable to Whitestone REIT, excluding amounts attributable to unvested restricted shares (in dollars per share)	0.38	0.04	0.06	0.07
Income from discontinued operations attributable to Whitestone REIT (in dollars per share)	(0.01)	0	0.02	0
Net income attributable to common shareholders, excluding amounts attributable to unvested restricted shares (in dollars per share)	$ 0.37	$ 0.04	$ 0.08	$ 0.07	$ 0.21	$ 0.19	$ 0.05	$ 0.08	$ 0.57	$ 0.52	$ 0.22

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Charges	$ 1,484	$ 1,391	$ 2,340
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	9,746	8,608	7,133
Deductions from Reserves	(57)	(253)	(865)
Balance at End of Year	$ 11,173	$ 9,746	$ 8,608

Schedule III - Real Estate an_2

Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Gross Amount at which Carried at End of Period
Total	$ 1,099,955	$ 1,052,238	$ 1,149,454	$ 1,099,955
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at beginning of period	1,052,238	1,149,454	920,310
Cumulative effect of accounting change for adoption of ASU 2017-05.	0	(95,146)	0
Additions during the period:
Acquisitions	34,804	0	213,545
Improvements	13,474	11,638	17,575
Real estate, total additions	48,278	(83,508)	231,120
Deductions - cost of real estate sold or retired	(561)	(13,708)	(1,976)
Balance at close of period	1,099,955	$ 1,052,238	$ 1,149,454
Anthem Marketplace [Member]
Additions during the period:
Amount of encumbrances				15,100
BLVD Place [Member]
Additions during the period:
Amount of encumbrances				80,000
Headquarters Village [Member]
Additions during the period:
Amount of encumbrances				19,000
Pinnacle of Scottsdale [Member]
Additions during the period:
Amount of encumbrances				14,100
Shops at Pecos Ranch [Member]
Additions during the period:
Amount of encumbrances				14,000
Shops at Starwood [Member]
Additions during the period:
Amount of encumbrances				14,300
Terravita Marketplace [Member]
Additions during the period:
Amount of encumbrances				10,500
Village Square at Dana Park [Member]
Additions during the period:
Amount of encumbrances				2,600
Whitestone [Member]
Initial Cost
Land				322,117
Building and Improvements				688,999
Costs Capitalized Subsequent to Acquisition
Improvements (net)				85,747
Carrying Costs				3,092
Gross Amount at which Carried at End of Period
Land				322,117
Building and Improvements				777,838
Total	1,099,955			1,099,955
Accumulated Depreciation				137,933
Additions during the period:
Balance at close of period	1,099,955
Aggregate cost of real estate for federal income tax purposes				1,065,837
Whitestone [Member] | Retail Communities [Member]
Initial Cost
Land				305,725
Building and Improvements				688,999
Costs Capitalized Subsequent to Acquisition
Improvements (net)				85,677
Carrying Costs				1,153
Gross Amount at which Carried at End of Period
Land				305,725
Building and Improvements				775,829
Total	1,081,554			1,081,554
Accumulated Depreciation				137,933
Additions during the period:
Balance at close of period	1,081,554
Whitestone [Member] | Retail Communities [Member] | Ahwatukee Plaza [Member]
Initial Cost
Land				5,126
Building and Improvements				4,086
Costs Capitalized Subsequent to Acquisition
Improvements (net)				365
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				5,126
Building and Improvements				4,451
Total	9,577			9,577
Accumulated Depreciation				943
Additions during the period:
Balance at close of period	9,577
Whitestone [Member] | Retail Communities [Member] | Anthem Marketplace [Member]
Initial Cost
Land				4,790
Building and Improvements				17,973
Costs Capitalized Subsequent to Acquisition
Improvements (net)				1,722
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				4,790
Building and Improvements				19,695
Total	24,485			24,485
Accumulated Depreciation				3,206
Additions during the period:
Balance at close of period	24,485
Whitestone [Member] | Retail Communities [Member] | Anthem Marketplace Phase II [Member]
Initial Cost
Land				204
Building and Improvements				0
Costs Capitalized Subsequent to Acquisition
Improvements (net)				492
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				204
Building and Improvements				492
Total	696			696
Accumulated Depreciation				9
Additions during the period:
Balance at close of period	696
Whitestone [Member] | Retail Communities [Member] | Bissonnet Beltway [Member]
Initial Cost
Land				415
Building and Improvements				1,947
Costs Capitalized Subsequent to Acquisition
Improvements (net)				484
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				415
Building and Improvements				2,431
Total	2,846			2,846
Accumulated Depreciation				1,958
Additions during the period:
Balance at close of period	2,846
Whitestone [Member] | Retail Communities [Member] | BLVD Place [Member]
Initial Cost
Land				63,893
Building and Improvements				90,942
Costs Capitalized Subsequent to Acquisition
Improvements (net)				1,507
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				63,893
Building and Improvements				92,449
Total	156,342			156,342
Accumulated Depreciation				6,245
Additions during the period:
Balance at close of period	156,342
Whitestone [Member] | Retail Communities [Member] | The Citadel [Member]
Initial Cost
Land				472
Building and Improvements				1,777
Costs Capitalized Subsequent to Acquisition
Improvements (net)				2,900
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				472
Building and Improvements				4,677
Total	5,149			5,149
Accumulated Depreciation				2,042
Additions during the period:
Balance at close of period	5,149
Whitestone [Member] | Retail Communities [Member] | City View Village [Member]
Initial Cost
Land				2,044
Building and Improvements				4,149
Costs Capitalized Subsequent to Acquisition
Improvements (net)				108
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				2,044
Building and Improvements				4,257
Total	6,301			6,301
Accumulated Depreciation				537
Additions during the period:
Balance at close of period	6,301
Whitestone [Member] | Retail Communities [Member] | Davenport Village [Member]
Initial Cost
Land				11,367
Building and Improvements				34,101
Costs Capitalized Subsequent to Acquisition
Improvements (net)				1,279
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				11,367
Building and Improvements				35,380
Total	46,747			46,747
Accumulated Depreciation				4,548
Additions during the period:
Balance at close of period	46,747
Whitestone [Member] | Retail Communities [Member] | Desert Canyon [Member]
Initial Cost
Land				1,976
Building and Improvements				1,704
Costs Capitalized Subsequent to Acquisition
Improvements (net)				2,566
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				1,976
Building and Improvements				4,270
Total	6,246			6,246
Accumulated Depreciation				802
Additions during the period:
Balance at close of period	6,246
Whitestone [Member] | Retail Communities [Member] | El Dorado Plaza [Member]
Initial Cost
Land				16,551
Building and Improvements				30,746
Costs Capitalized Subsequent to Acquisition
Improvements (net)				250
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				16,551
Building and Improvements				30,996
Total	47,547			47,547
Accumulated Depreciation				2,091
Additions during the period:
Balance at close of period	47,547
Whitestone [Member] | Retail Communities [Member] | Fountain Hills Plaza [Member]
Initial Cost
Land				5,113
Building and Improvements				15,340
Costs Capitalized Subsequent to Acquisition
Improvements (net)				255
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				5,113
Building and Improvements				15,595
Total	20,708			20,708
Accumulated Depreciation				2,589
Additions during the period:
Balance at close of period	20,708
Whitestone [Member] | Retail Communities [Member] | Fountain Square [Member]
Initial Cost
Land				5,573
Building and Improvements				9,828
Costs Capitalized Subsequent to Acquisition
Improvements (net)				2,327
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				5,573
Building and Improvements				12,155
Total	17,728			17,728
Accumulated Depreciation				2,758
Additions during the period:
Balance at close of period	17,728
Whitestone [Member] | Retail Communities [Member] | Fulton Ranch Towne Center [Member]
Initial Cost
Land				7,604
Building and Improvements				22,612
Costs Capitalized Subsequent to Acquisition
Improvements (net)				2,515
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				7,604
Building and Improvements				25,127
Total	32,731			32,731
Accumulated Depreciation				3,259
Additions during the period:
Balance at close of period	32,731
Whitestone [Member] | Retail Communities [Member] | Gilbert Tuscany Village [Member]
Initial Cost
Land				1,767
Building and Improvements				3,233
Costs Capitalized Subsequent to Acquisition
Improvements (net)				1,599
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				1,767
Building and Improvements				4,832
Total	6,599			6,599
Accumulated Depreciation				1,762
Additions during the period:
Balance at close of period	6,599
Whitestone [Member] | Retail Communities [Member] | Gilbert Tuscany Village Hard Corner [Member]
Initial Cost
Land				856
Building and Improvements				794
Costs Capitalized Subsequent to Acquisition
Improvements (net)				169
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				856
Building and Improvements				963
Total	1,819			1,819
Accumulated Depreciation				128
Additions during the period:
Balance at close of period	1,819
Whitestone [Member] | Retail Communities [Member] | Heritage Trace Plaza [Member]
Initial Cost
Land				6,209
Building and Improvements				13,821
Costs Capitalized Subsequent to Acquisition
Improvements (net)				622
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				6,209
Building and Improvements				14,443
Total	20,652			20,652
Accumulated Depreciation				2,152
Additions during the period:
Balance at close of period	20,652
Whitestone [Member] | Retail Communities [Member] | Headquarters Village [Member]
Initial Cost
Land				7,171
Building and Improvements				18,439
Costs Capitalized Subsequent to Acquisition
Improvements (net)				1,363
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				7,171
Building and Improvements				19,802
Total	26,973			26,973
Accumulated Depreciation				3,699
Additions during the period:
Balance at close of period	26,973
Whitestone [Member] | Retail Communities [Member] | Keller Place [Member]
Initial Cost
Land				5,977
Building and Improvements				7,577
Costs Capitalized Subsequent to Acquisition
Improvements (net)				790
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				5,977
Building and Improvements				8,367
Total	14,344			14,344
Accumulated Depreciation				964
Additions during the period:
Balance at close of period	14,344
Whitestone [Member] | Retail Communities [Member] | Kempwood Plaza [Member]
Initial Cost
Land				733
Building and Improvements				1,798
Costs Capitalized Subsequent to Acquisition
Improvements (net)				2,076
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				733
Building and Improvements				3,874
Total	4,607			4,607
Accumulated Depreciation				1,808
Additions during the period:
Balance at close of period	4,607
Whitestone [Member] | Retail Communities [Member] | La Mirada [Member]
Initial Cost
Land				12,853
Building and Improvements				24,464
Costs Capitalized Subsequent to Acquisition
Improvements (net)				1,166
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				12,853
Building and Improvements				25,630
Total	38,483			38,483
Accumulated Depreciation				2,264
Additions during the period:
Balance at close of period	38,483
Whitestone [Member] | Retail Communities [Member] | Las Colinas Village [Member]
Initial Cost
Land				16,706
Building and Improvements				18,098
Costs Capitalized Subsequent to Acquisition
Improvements (net)				(167)
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				16,706
Building and Improvements				17,931
Total	34,637			34,637
Accumulated Depreciation				39
Additions during the period:
Balance at close of period	34,637
Whitestone [Member] | Retail Communities [Member] | Lion Square [Member]
Initial Cost
Land				1,546
Building and Improvements				4,289
Costs Capitalized Subsequent to Acquisition
Improvements (net)				4,573
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				1,546
Building and Improvements				8,862
Total	10,408			10,408
Accumulated Depreciation				5,235
Additions during the period:
Balance at close of period	10,408
Whitestone [Member] | Retail Communities [Member] | MarketPlace at Central [Member]
Initial Cost
Land				1,305
Building and Improvements				5,324
Costs Capitalized Subsequent to Acquisition
Improvements (net)				1,337
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				1,305
Building and Improvements				6,661
Total	7,966			7,966
Accumulated Depreciation				1,956
Additions during the period:
Balance at close of period	7,966
Whitestone [Member] | Retail Communities [Member] | Market Street at DC Ranch [Member]
Initial Cost
Land				9,710
Building and Improvements				26,779
Costs Capitalized Subsequent to Acquisition
Improvements (net)				6,786
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				9,710
Building and Improvements				33,565
Total	43,275			43,275
Accumulated Depreciation				6,932
Additions during the period:
Balance at close of period	43,275
Whitestone [Member] | Retail Communities [Member] | Mercado at Scottsdale Ranch [Member]
Initial Cost
Land				8,728
Building and Improvements				12,560
Costs Capitalized Subsequent to Acquisition
Improvements (net)				1,553
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				8,728
Building and Improvements				14,113
Total	22,841			22,841
Accumulated Depreciation				2,602
Additions during the period:
Balance at close of period	22,841
Whitestone [Member] | Retail Communities [Member] | Paradise Plaza [Member]
Initial Cost
Land				6,155
Building and Improvements				10,221
Costs Capitalized Subsequent to Acquisition
Improvements (net)				1,356
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				6,155
Building and Improvements				11,577
Total	17,732			17,732
Accumulated Depreciation				2,517
Additions during the period:
Balance at close of period	17,732
Whitestone [Member] | Retail Communities [Member] | Parkside Village North [Member]
Initial Cost
Land				3,877
Building and Improvements				8,629
Costs Capitalized Subsequent to Acquisition
Improvements (net)				199
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				3,877
Building and Improvements				8,828
Total	12,705			12,705
Accumulated Depreciation				1,068
Additions during the period:
Balance at close of period	12,705
Whitestone [Member] | Retail Communities [Member] | Parkside Village South [Member]
Initial Cost
Land				5,562
Building and Improvements				27,154
Costs Capitalized Subsequent to Acquisition
Improvements (net)				424
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				5,562
Building and Improvements				27,578
Total	33,140			33,140
Accumulated Depreciation				3,195
Additions during the period:
Balance at close of period	33,140
Whitestone [Member] | Retail Communities [Member] | Pima Norte [Member]
Initial Cost
Land				1,086
Building and Improvements				7,162
Costs Capitalized Subsequent to Acquisition
Improvements (net)				2,748
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				1,086
Building and Improvements				9,910
Total	10,996			10,996
Accumulated Depreciation				3,166
Additions during the period:
Balance at close of period	10,996
Whitestone [Member] | Retail Communities [Member] | Pinnacle of Scottsdale [Member]
Initial Cost
Land				6,648
Building and Improvements				22,466
Costs Capitalized Subsequent to Acquisition
Improvements (net)				1,885
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				6,648
Building and Improvements				24,351
Total	30,999			30,999
Accumulated Depreciation				5,391
Additions during the period:
Balance at close of period	30,999
Whitestone [Member] | Retail Communities [Member] | Pinnacle of Scottsdale Phase II [Member]
Initial Cost
Land				883
Building and Improvements				4,659
Costs Capitalized Subsequent to Acquisition
Improvements (net)				2,722
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				883
Building and Improvements				7,381
Total	8,264			8,264
Accumulated Depreciation				934
Additions during the period:
Balance at close of period	8,264
Whitestone [Member] | Retail Communities [Member] | The Promenade at Fulton Ranch [Member]
Initial Cost
Land				5,198
Building and Improvements				13,367
Costs Capitalized Subsequent to Acquisition
Improvements (net)				681
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				5,198
Building and Improvements				14,048
Total	19,246			19,246
Accumulated Depreciation				1,951
Additions during the period:
Balance at close of period	19,246
Whitestone [Member] | Retail Communities [Member] | Providence [Member]
Initial Cost
Land				918
Building and Improvements				3,675
Costs Capitalized Subsequent to Acquisition
Improvements (net)				2,931
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				918
Building and Improvements				6,606
Total	7,524			7,524
Accumulated Depreciation				2,510
Additions during the period:
Balance at close of period	7,524
Whitestone [Member] | Retail Communities [Member] | Quinlan Crossing [Member]
Initial Cost
Land				9,561
Building and Improvements				28,683
Costs Capitalized Subsequent to Acquisition
Improvements (net)				732
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				9,561
Building and Improvements				29,415
Total	38,976			38,976
Accumulated Depreciation				3,366
Additions during the period:
Balance at close of period	38,976
Whitestone [Member] | Retail Communities [Member] | Seville [Member]
Initial Cost
Land				6,913
Building and Improvements				25,518
Costs Capitalized Subsequent to Acquisition
Improvements (net)				637
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				6,913
Building and Improvements				26,155
Total	33,068			33,068
Accumulated Depreciation				2,245
Additions during the period:
Balance at close of period	33,068
Whitestone [Member] | Retail Communities [Member] | Shaver [Member]
Initial Cost
Land				184
Building and Improvements				633
Costs Capitalized Subsequent to Acquisition
Improvements (net)				101
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				184
Building and Improvements				734
Total	918			918
Accumulated Depreciation				389
Additions during the period:
Balance at close of period	918
Whitestone [Member] | Retail Communities [Member] | Shops at Pecos Ranch [Member]
Initial Cost
Land				3,781
Building and Improvements				15,123
Costs Capitalized Subsequent to Acquisition
Improvements (net)				792
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				3,781
Building and Improvements				15,915
Total	19,696			19,696
Accumulated Depreciation				3,074
Additions during the period:
Balance at close of period	19,696
Whitestone [Member] | Retail Communities [Member] | Shops at Starwood [Member]
Initial Cost
Land				4,093
Building and Improvements				11,487
Costs Capitalized Subsequent to Acquisition
Improvements (net)				529
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				4,093
Building and Improvements				12,016
Total	16,109			16,109
Accumulated Depreciation				2,568
Additions during the period:
Balance at close of period	16,109
Whitestone [Member] | Retail Communities [Member] | Shops at Starwood Phase III [Member]
Initial Cost
Land				1,818
Building and Improvements				7,069
Costs Capitalized Subsequent to Acquisition
Improvements (net)				2,168
Carrying Costs				1,153
Gross Amount at which Carried at End of Period
Land				1,818
Building and Improvements				10,390
Total	12,208			12,208
Accumulated Depreciation				1,121
Additions during the period:
Balance at close of period	12,208
Whitestone [Member] | Retail Communities [Member] | The Shops at Williams Trace [Member]
Initial Cost
Land				5,920
Building and Improvements				14,297
Costs Capitalized Subsequent to Acquisition
Improvements (net)				759
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				5,920
Building and Improvements				15,056
Total	20,976			20,976
Accumulated Depreciation				2,027
Additions during the period:
Balance at close of period	20,976
Whitestone [Member] | Retail Communities [Member] | South Richey [Member]
Initial Cost
Land				778
Building and Improvements				2,584
Costs Capitalized Subsequent to Acquisition
Improvements (net)				1,960
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				778
Building and Improvements				4,544
Total	5,322			5,322
Accumulated Depreciation				2,572
Additions during the period:
Balance at close of period	5,322
Whitestone [Member] | Retail Communities [Member] | Spoerlein Commons [Member]
Initial Cost
Land				2,340
Building and Improvements				7,296
Costs Capitalized Subsequent to Acquisition
Improvements (net)				940
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				2,340
Building and Improvements				8,236
Total	10,576			10,576
Accumulated Depreciation				2,391
Additions during the period:
Balance at close of period	10,576
Whitestone [Member] | Retail Communities [Member] | The Strand at Huebner Oaks [Member]
Initial Cost
Land				5,805
Building and Improvements				12,335
Costs Capitalized Subsequent to Acquisition
Improvements (net)				817
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				5,805
Building and Improvements				13,152
Total	18,957			18,957
Accumulated Depreciation				1,854
Additions during the period:
Balance at close of period	18,957
Whitestone [Member] | Retail Communities [Member] | SugarPark Plaza [Member]
Initial Cost
Land				1,781
Building and Improvements				7,125
Costs Capitalized Subsequent to Acquisition
Improvements (net)				1,337
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				1,781
Building and Improvements				8,462
Total	10,243			10,243
Accumulated Depreciation				3,265
Additions during the period:
Balance at close of period	10,243
Whitestone [Member] | Retail Communities [Member] | Sunridge [Member]
Initial Cost
Land				276
Building and Improvements				1,186
Costs Capitalized Subsequent to Acquisition
Improvements (net)				532
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				276
Building and Improvements				1,718
Total	1,994			1,994
Accumulated Depreciation				889
Additions during the period:
Balance at close of period	1,994
Whitestone [Member] | Retail Communities [Member] | Sunset at Pinnacle Peak [Member]
Initial Cost
Land				3,610
Building and Improvements				2,734
Costs Capitalized Subsequent to Acquisition
Improvements (net)				756
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				3,610
Building and Improvements				3,490
Total	7,100			7,100
Accumulated Depreciation				882
Additions during the period:
Balance at close of period	7,100
Whitestone [Member] | Retail Communities [Member] | Terravita Marketplace [Member]
Initial Cost
Land				7,171
Building and Improvements				9,392
Costs Capitalized Subsequent to Acquisition
Improvements (net)				1,086
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				7,171
Building and Improvements				10,478
Total	17,649			17,649
Accumulated Depreciation				2,389
Additions during the period:
Balance at close of period	17,649
Whitestone [Member] | Retail Communities [Member] | Town Park [Member]
Initial Cost
Land				850
Building and Improvements				2,911
Costs Capitalized Subsequent to Acquisition
Improvements (net)				450
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				850
Building and Improvements				3,361
Total	4,211			4,211
Accumulated Depreciation				2,225
Additions during the period:
Balance at close of period	4,211
Whitestone [Member] | Retail Communities [Member] | Village Square at Dana Park [Member]
Initial Cost
Land				10,877
Building and Improvements				40,250
Costs Capitalized Subsequent to Acquisition
Improvements (net)				3,804
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				10,877
Building and Improvements				44,054
Total	54,931			54,931
Accumulated Depreciation				8,776
Additions during the period:
Balance at close of period	54,931
Whitestone [Member] | Retail Communities [Member] | Westchase [Member]
Initial Cost
Land				423
Building and Improvements				1,751
Costs Capitalized Subsequent to Acquisition
Improvements (net)				3,281
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				423
Building and Improvements				5,032
Total	5,455			5,455
Accumulated Depreciation				2,365
Additions during the period:
Balance at close of period	5,455
Whitestone [Member] | Retail Communities [Member] | Williams Trace Plaza [Member]
Initial Cost
Land				6,800
Building and Improvements				14,003
Costs Capitalized Subsequent to Acquisition
Improvements (net)				1,696
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				6,800
Building and Improvements				15,699
Total	22,499			22,499
Accumulated Depreciation				1,937
Additions during the period:
Balance at close of period	22,499
Whitestone [Member] | Retail Communities [Member] | Windsor Park [Member]
Initial Cost
Land				2,621
Building and Improvements				10,482
Costs Capitalized Subsequent to Acquisition
Improvements (net)				8,592
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				2,621
Building and Improvements				19,074
Total	21,695			21,695
Accumulated Depreciation				9,419
Additions during the period:
Balance at close of period	21,695
Whitestone [Member] | Retail Communities [Member] | Woodlake Plaza [Member]
Initial Cost
Land				1,107
Building and Improvements				4,426
Costs Capitalized Subsequent to Acquisition
Improvements (net)				3,125
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				1,107
Building and Improvements				7,551
Total	8,658			8,658
Accumulated Depreciation				2,919
Additions during the period:
Balance at close of period	8,658
Whitestone [Member] | Land Held for Development [Member]
Initial Cost
Land				16,392
Building and Improvements				0
Costs Capitalized Subsequent to Acquisition
Improvements (net)				70
Carrying Costs				1,939
Gross Amount at which Carried at End of Period
Land				16,392
Building and Improvements				2,009
Total	18,401			18,401
Accumulated Depreciation				0
Additions during the period:
Balance at close of period	18,401
Whitestone [Member] | Land Held for Development [Member] | Market Street at DC Ranch [Member]
Initial Cost
Land				704
Building and Improvements				0
Costs Capitalized Subsequent to Acquisition
Improvements (net)				0
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				704
Building and Improvements				0
Total	704			704
Accumulated Depreciation				0
Additions during the period:
Balance at close of period	704
Whitestone [Member] | Land Held for Development [Member] | BLVD Place Phase II-B [Member]
Initial Cost
Land				10,500
Building and Improvements				0
Costs Capitalized Subsequent to Acquisition
Improvements (net)				15
Carrying Costs				1,939
Gross Amount at which Carried at End of Period
Land				10,500
Building and Improvements				1,954
Total	12,454			12,454
Accumulated Depreciation				0
Additions during the period:
Balance at close of period	12,454
Whitestone [Member] | Land Held for Development [Member] | Dana Park Development [Member]
Initial Cost
Land				4,000
Building and Improvements				0
Costs Capitalized Subsequent to Acquisition
Improvements (net)				25
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				4,000
Building and Improvements				25
Total	4,025			4,025
Accumulated Depreciation				0
Additions during the period:
Balance at close of period	4,025
Whitestone [Member] | Land Held for Development [Member] | Eldorado Plaza Development [Member]
Initial Cost
Land				911
Building and Improvements				0
Costs Capitalized Subsequent to Acquisition
Improvements (net)				30
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				911
Building and Improvements				30
Total	941			941
Accumulated Depreciation				0
Additions during the period:
Balance at close of period	941
Whitestone [Member] | Land Held for Development [Member] | Fountain Hills [Member]
Initial Cost
Land				277
Building and Improvements				0
Costs Capitalized Subsequent to Acquisition
Improvements (net)				0
Carrying Costs				0
Gross Amount at which Carried at End of Period
Land				277
Building and Improvements				0
Total	277			277
Accumulated Depreciation				$ 0
Additions during the period:
Balance at close of period	$ 277
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Ahwatukee Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Anthem Marketplace [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Anthem Marketplace Phase II [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Bissonnet Beltway [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | BLVD Place [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | The Citadel [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | City View Village [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Davenport Village [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Desert Canyon [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | El Dorado Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Fountain Hills Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Fountain Square [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Fulton Ranch Towne Center [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Gilbert Tuscany Village [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Gilbert Tuscany Village Hard Corner [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Heritage Trace Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Headquarters Village [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Keller Place [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Kempwood Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | La Mirada [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Las Colinas Village [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Lion Square [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | MarketPlace at Central [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Market Street at DC Ranch [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Mercado at Scottsdale Ranch [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Paradise Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Parkside Village North [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Parkside Village South [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Pima Norte [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Pinnacle of Scottsdale [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Pinnacle of Scottsdale Phase II [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | The Promenade at Fulton Ranch [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Providence [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Quinlan Crossing [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Seville [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Shaver [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Shops at Pecos Ranch [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Shops at Starwood [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Shops at Starwood Phase III [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | The Shops at Williams Trace [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | South Richey [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Spoerlein Commons [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | The Strand at Huebner Oaks [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | SugarPark Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Sunridge [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Sunset at Pinnacle Peak [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Terravita Marketplace [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Town Park [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Village Square at Dana Park [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Westchase [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Williams Trace Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Windsor Park [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Minimum [Member] | Retail Communities [Member] | Woodlake Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	5 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Ahwatukee Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Anthem Marketplace [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Anthem Marketplace Phase II [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Bissonnet Beltway [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | BLVD Place [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | The Citadel [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | City View Village [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Davenport Village [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Desert Canyon [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | El Dorado Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Fountain Hills Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Fountain Square [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Fulton Ranch Towne Center [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Gilbert Tuscany Village [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Gilbert Tuscany Village Hard Corner [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Heritage Trace Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Headquarters Village [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Keller Place [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Kempwood Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | La Mirada [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Las Colinas Village [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Lion Square [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | MarketPlace at Central [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Market Street at DC Ranch [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Mercado at Scottsdale Ranch [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Paradise Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Parkside Village North [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Parkside Village South [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Pima Norte [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Pinnacle of Scottsdale [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Pinnacle of Scottsdale Phase II [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | The Promenade at Fulton Ranch [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Providence [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Quinlan Crossing [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Seville [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Shaver [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Shops at Pecos Ranch [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Shops at Starwood [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Shops at Starwood Phase III [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | The Shops at Williams Trace [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | South Richey [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Spoerlein Commons [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | The Strand at Huebner Oaks [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | SugarPark Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Sunridge [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Sunset at Pinnacle Peak [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Terravita Marketplace [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Town Park [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Village Square at Dana Park [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Westchase [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Williams Trace Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Windsor Park [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years
Whitestone [Member] | Maximum [Member] | Retail Communities [Member] | Woodlake Plaza [Member]
Gross Amount at which Carried at End of Period
Depreciation Life	39 years

Uncategorized Items - wsr-20191

Label	Element	Value
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	$ 377,523,000
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	(157,565,000)
Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	521,314,000
Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	$ 10,800,000
Units of Partnership Interest, Amount, Adjusted Balance	wsr_UnitsofPartnershipInterestAmountAdjustedBalance	1,084,000
Parent [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	$ 366,723,000
AOCI Attributable to Parent [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	2,936,000
Common Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	$ 38,000
Common Stock, Shares, Outstanding, Adjusted Balance	wsr_CommonStockSharesOutstandingAdjustedBalance	39,222,000
Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 19,119,000	[1]
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	19,119,000	[1]
Accounting Standards Update 2014-09 [Member] | Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 19,119,000	[1]
[1]	Represents the impact of change in accounting principal for our modified retrospective adoption of ASU 2014-09. See Note 2 of the notes to the consolidated financial statements for additional disclosure.