Entity Central Index Key Cover [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Title of 12(b) Security Security12b Title Security Exchange Name Security Exchange Name Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Document Quarterly Report Document Quarterly Report Document Transition Report Document Transition Report Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Tax Identification Number Entity Tax Identification Number Entity File Number Entity File Number Entity Incorporation, State or Country Code Entity Incorporation State Country Code Entity Address, Address Line One Entity Address Address Line1 Entity Address, City or Town Entity Address City Or Town Entity Address, State or Province Entity Address State Or Province Entity Address, Postal Zip Code Entity Address Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Represents the amount, as of the balance sheet date, of rental income in excess of amount billed. Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Series A Preferred Stock [Member] Series A Preferred Stock [Member] Series B Preferred Stock, Non-Voting [Member] Series B Preferred Stock [Member] Statement [Line Items] Statement [Line Items] ASSETS Assets [Abstract] Real estate, at cost: Real Estate Investment Property At Cost [Abstract] Land Land Buildings and improvements Investment Building And Building Improvements Total real estate, at cost Real Estate Investment Property At Cost Less: accumulated depreciation and amortization Real Estate Investment Property Accumulated Depreciation Net real estate held for investment Real Estate Investment Property Net Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Restricted cash Restricted Cash Rental income in excess of amount billed Rental Income In Excess Of Amount Billed Acquired lease intangible assets, net Intangible Assets Net Excluding Goodwill Investment in unconsolidated affiliate Investments In Affiliates Subsidiaries Associates And Joint Ventures Other assets Other Assets Total assets Assets LIABILITIES AND EQUITY Liabilities And Stockholders Equity [Abstract] Liabilities: Liabilities [Abstract] Mortgage notes payable, net Notes Payable Secured revolving credit facility Line Of Credit Accounts payable and accrued expenses Accounts Payable And Accrued Liabilities Current And Noncurrent Dividends payable Dividends Payable Current And Noncurrent Acquired lease intangible liabilities, net Below Market Lease Net Other liabilities Other Liabilities Total liabilities Liabilities Commitments and contingencies (Note 8) Commitments And Contingencies Equity: Stockholders Equity [Abstract] Preferred stock, value Preferred Stock Value Common stock, $.0001 par value; 100,000,000 shares authorized; 13,627,220 and 13,537,856 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Distributions in excess of net income Accumulated Distributions In Excess Of Net Income Total stockholders’ equity Stockholders Equity Noncontrolling interest Minority Interest Total equity Stockholders Equity Including Portion Attributable To Noncontrolling Interest Total liabilities and equity Liabilities And Stockholders Equity Preferred stock, par value (in dollars per share) Preferred Stock Par Or Stated Value Per Share Preferred stock, shares authorized Preferred Stock Shares Authorized Preferred stock, shares issued Preferred Stock Shares Issued Preferred stock, shares outstanding Preferred Stock Shares Outstanding Common stock, par value (in dollars per share) Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Income Statement [Abstract] Revenues: Revenues [Abstract] Rental income Operating Leases Income Statement Lease Revenue Total revenues Revenues Operating Expenses: Operating Expenses [Abstract] Property operating expenses Operating Costs And Expenses General and administrative General And Administrative Expense Depreciation and amortization Depreciation And Amortization Total operating expenses Operating Expenses Operating income Operating Income Loss Interest expense Interest Expense Equity in earnings of unconsolidated affiliate Income Loss From Equity Method Investments Other (loss) income Other Nonoperating Income Expense Net income Profit Loss Less: Net income attributable to noncontrolling interest Net Income Loss Attributable To Noncontrolling Interest Net income attributable to common stockholders Net Income Loss Net income per common share attributable to common stockholders - basic and diluted earnings per share Earnings Per Share Basic And Diluted Weighted average common shares outstanding – basic Weighted Average Number Of Shares Outstanding Basic Weighted average common shares outstanding – diluted Weighted Average Number Of Diluted Shares Outstanding Adjustments to additional paid in capital, reallocation of equity interest. Statement Of Stockholders Equity [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Preferred Stock [Member] Preferred Stock [Member] Common Stock [Member] Common Stock [Member] Additional-Paid-In-Capital [Member] Additional Paid In Capital [Member] Distributions in Excess of Net Income [Member] Accumulated Distributions In Excess Of Net Income [Member] Total Stockholders' Equity [Member] Parent [Member] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Beginning Balance Beginning Balance (in shares) Shares Outstanding Common stock dividends Dividends Common Stock Cash Repurchases - common stock Stock Repurchased During Period Value Repurchases - common stock (in shares) Stock Repurchased During Period Shares Stock-based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Issuance of shares Stock Issued During Period Shares Restricted Stock Award Gross Distributions to noncontrolling interest Minority Interest Decrease From Distributions To Noncontrolling Interest Holders Net income Reallocation of equity Adjustments To Additional Paid In Capital Reallocation Of Equity Interest Ending Balance Ending Balance (in shares) Amortization of intangible assets and deferred charges. Distributions from unconsolidated affiliate. Returns of capital from unconsolidated affiliates. Loan costs from mortgage notes payable Right-of-use assets, operating leases obtained in exchange for operating lease liabilities. Statement Of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided By Used In Operating Activities [Abstract] Net income Adjustments to reconcile net income to net cash provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation Depreciation Amortization of intangible assets and deferred charges Amortization Of Intangible Assets And Deferred Charges Stock-based compensation Share Based Compensation Rental income in excess of amount billed Straight Line Rent Distributions from unconsolidated affiliate Distributions From Unconsolidated Affiliate Income from equity investment in unconsolidated affiliate Income Loss From Equity Method Investments Net Of Dividends Or Distributions Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Other assets Increase Decrease In Other Operating Assets Accounts payable and accrued expenses Increase Decrease In Accounts Payable And Accrued Liabilities Other liabilities Increase Decrease In Other Operating Liabilities Net cash provided by operating activities Net Cash Provided By Used In Operating Activities CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided By Used In Investing Activities [Abstract] Expenditures for improvements to real estate Payments To Develop Real Estate Assets Return of capital from unconsolidated affiliate Returns Of Capital From Unconsolidated Affiliates Net cash used in investing activities Net Cash Provided By Used In Investing Activities CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided By Used In Financing Activities [Abstract] Proceeds from mortgage notes payable Proceeds From Notes Payable Loan costs from mortgage notes payable Loan Costs From Mortgage Notes Payable Proceeds from revolving credit facility Proceeds From Lines Of Credit Repurchase of common stock Payments For Repurchase Of Common Stock Payment of mortgage principal Repayments Of Notes Payable Cash distributions to noncontrolling interests Payments Of Dividends Minority Interest Cash dividends paid Payments Of Dividends Common Stock Net cash provided by (used in) financing activities Net Cash Provided By Used In Financing Activities Net increase in cash and cash equivalents Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Cash and cash equivalents including restricted cash of $2,232 and $3,895, respectively, at the beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations Cash and cash equivalents including restricted cash of $2,568 and $4,754, respectively, at the end of period SUPPLEMENTAL DISCLOSURE CASH FLOW INFORMATION: Supplemental Cash Flow Information [Abstract] Cash paid during the period for interest, net of amount capitalized of $96 for 2020 and $62 for 2019 Interest Paid Net Non-cash expenditures for real estate Capital Lease Obligations Incurred Right-of-use assets, operating leases obtained in exchange for operating lease liabilities Right Of Use Assets Operating Leases Obtained In Exchange For Operating Lease Liabilities Cash paid for income taxes Income Taxes Paid Restricted cash, at the beginning of period Restricted cash, at the end of period Cash paid for interest, capitalized amount Interest Paid Capitalized Organization Consolidation And Presentation Of Financial Statements [Abstract] Organization and Description of Business Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Debt Disclosure [Abstract] Mortgage Notes Payable Mortgage Notes Payable Disclosure [Text Block] Line Of Credit Facility [Abstract] Secured Revolving Credit Facility Debt Disclosure [Text Block] Equity [Abstract] Stockholders' Equity Stockholders Equity Note Disclosure [Text Block] Earnings Per Share [Abstract] Earnings per Share Earnings Per Share [Text Block] Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Fair Value Disclosures [Abstract] Fair Value Fair Value Disclosures [Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Basis of Presentation Basis Of Presentation And Significant Accounting Policies [Text Block] Use of Estimates Use Of Estimates Reclassification Prior Period Reclassification Adjustment Description Real Estate Real Estate Policy [Text Block] Investment in Unconsolidated Affiliates Investment Policy [Text Block] Depreciation and Amortization Depreciation Depletion And Amortization Policy [Text Block] Asset Impairment Impairment Or Disposal Of Long Lived Assets Policy [Text Block] Deferred Charges Deferred Charges Policy [Text Block] Reportable Segments Segment Reporting Policy Policy [Text Block] Revenue Recognition Revenue Recognition Policy [Text Block] Earnings Per Share Information Earnings Per Share Policy [Text Block] Cash and Cash Equivalents Cash And Cash Equivalents Policy [Text Block] Restricted Cash Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy Fair Value Measurement Fair Value Measurement Policy Policy [Text Block] Income Taxes Income Tax Policy [Text Block] Concentrations of Credit Risk Concentration Risk Credit Risk Stock-Based Compensation Compensation Related Costs Policy [Text Block] Recent Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Schedule of projected impact of above market below market and in place lease intangibles. Schedule of Projected Impact of Above Market Below Market and In-Place Lease Intangibles Schedule Of Projected Impact Of Above Market Below Market And In Place Lease Intangibles Table [Text Block] Summary of Future Minimum Contractual Lease Payments to be Received Lessor Operating Lease Payments To Be Received Maturity Table [Text Block] Summary of Company's Mortgage Notes Payable Schedule Of Participating Mortgage Loans [Text Block] Schedule of Principal Repayments Schedule Of Maturities Of Long Term Debt Table [Text Block] Schedule of Dividends Declared on Common Stock Dividends Declared Table [Text Block] Schedule of Shares Issued Under the 2007 Plan and 2017 Plan Schedule Of Share Based Compensation Activity Table [Text Block] Summary of Restricted Stock Activity Schedule Of Sharebased Compensation Restricted Stock And Restricted Stock Units Activity Table [Text Block] Summary of Vesting Schedule of Non-vested Shares of Restricted Stock Outstanding Schedule Of Nonvested Restricted Stock Units Activity Table [Text Block] Schedule of Computation of Basic and Diluted Earnings per Share Information Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Schedule of Fair Value of Financial Assets and Liabilities Fair Value By Balance Sheet Grouping [Text Block] Represents the number of shares of common stock that can be issued on conversion of interest in limited partnership. Represents number of shares of preferred stock that can be issued on conversion of interest in limited partnership. Represents the number of commercial properties acquired. Organization and description of business. Organization and description of business. Organization And Description Of Business [Table] Organization And Description Of Business [Table] Scenario Statement Scenario [Axis] Scenario Scenario Unspecified [Domain] Due to redemption of certain shares. Due to redemption of certain shares [Member] Due To Redemption Of Certain Shares [Member] Ownership Ownership [Axis] Ownership Ownership [Domain] Operating partnership. Operating Partnership [Member] Operating Partnership [Member] Legal Entity Legal Entity [Axis] Entity Entity [Domain] Wu/Lighthouse Portfolio, LLC. Wu/Lighthouse Portfolio, LLC [Member] Wu Lighthouse Portfolio L L C [Member] Organization And Description Of Business [Line Items] Organization And Description Of Business [Line Items] Number of commercial properties acquired Number Of Real Estate Properties Acquired Ownership interest in partnership units (as a percent) Limited Liability Company L L C Or Limited Partnership L P Members Or Limited Partners Ownership Interest Number of shares of common stock that can be issued on conversion of interest in limited partnership Limited Liability Company L L C Or Limited Partnership L P Members Or Limited Partners Ownership Interest Conversion Into Common Stock Number Number of shares of preferred stock that can be issued on conversion of interest in limited partnership Limited Liability Company L L C Or Limited Partnership L P Members Or Limited Partners Ownership Interest Conversion Into Preferred Stock Number Percentage of ownership owned in joint venture. Number of properties owned and operated Number Of Real Estate Properties Leasable area owned by the company Area Of Real Estate Property Area of land in New York, New Jersey, Connecticut, and Delaware Area Of Land Percentage of ownership owned in joint venture Percentage Of Ownership Owned In Joint Venture Adjustment to additional paid-in-capital , increase (decrease) in operating partnerships non-controlling interest. Summary of significant accounting policies. Summary of significant accounting policies. Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Balance Sheet Location Balance Sheet Location [Axis] Balance Sheet Location Balance Sheet Location [Domain] Investment building and building improvements. Buildings and Improvements [Member] Investment Building And Building Improvements [Member] Finite-Lived Intangible Assets by Major Class Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name Finite Lived Intangible Assets Major Class Name [Domain] Above Market Lease [Member] Above Market Leases [Member] In-place Lease [Member] Leases Acquired In Place [Member] Business Acquisition Business Acquisition [Axis] Business Acquisition, Acquiree Business Acquisition Acquiree [Domain] Two CPS Developers LLC. Two CPS Developers LLC [Member] Two C P S Developers L L C [Member] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Long-Lived Tangible Asset Property Plant And Equipment By Type [Axis] Long-Lived Tangible Asset Property Plant And Equipment Type [Domain] Properties and Property Improvements [Member] Land Buildings And Improvements [Member] Furniture, Fixtures and Equipment [Member] Furniture And Fixtures [Member] Real Estate, Type of Property Mortgage Loans On Real Estate Description Type Of Property [Axis] Real Estate Mortgage Loans On Real Estate Name Property Type [Domain] Industrial Building [Member] Industrial Property [Member] Concentration Risk Type Concentration Risk By Type [Axis] Concentration Risk Type Concentration Risk Type [Domain] Customer Concentration Risk [Member] Customer Concentration Risk [Member] Concentration Risk Benchmark Concentration Risk By Benchmark [Axis] Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Sales Revenue Net [Member] Sales Revenue Net [Member] Accounting Standards Update Adjustments For New Accounting Pronouncements [Axis] Accounting Standards Update Type Of Adoption [Member] Accounting Standards Update 2016-02 [Member] Accounting Standards Update201602 [Member] Summary of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Redemptions of shares Partners Capital Account Units Redeemed Offsetting increase to operating partnership's non-controlling interest Adjustment To Additional Paid In Capital Increase Decrease In Operating Partnerships Non Controlling Interest Real estate under development Development In Process Net impact to rental revenues due to amortization of above market and below market leases. Net impact to rental revenues due to the amortization of above market and below market leases Net Impact To Rental Revenues Due To Amortization Of Above Market And Below Market Leases Acquired lease intangible assets, net Finite Lived Intangible Assets Net Amortization to below market leases Below market lease net of above market lease and accumulated amortization. Below market lease net of above market lease and accumulated amortization reminder of fiscal year. Below market lease net of above market lease and accumulated amortization year two. Below market lease net of above market lease and accumulated amortization year three. Below market lease net of above market lease and accumulated amortization year four. Below market lease net of above market lease and accumulated amortization year five. Below market lease net of above market lease and accumulated amortization year six. Below market lease net of above market lease and accumulated amortization after year six. Below market lease net of above market lease and accumulated amortization. Finite lived intangible assets amortization expense year six. Finite lived intangible assets amortization expense after year six. Asset Retirement Obligation Disclosure [Abstract] Schedule Of Finite Lived Intangible Assets [Table] Schedule Of Finite Lived Intangible Assets [Table] Finite Lived Intangible Assets [Line Items] Finite Lived Intangible Assets [Line Items] Net increase to rental revenues: Below Market Lease Net Of Above Market Lease And Accumulated Amortization [Abstract] Remainder of 2020 Below Market Lease Net Of Above Market Lease And Accumulated Amortization Reminder Of Fiscal Year 2021 Below Market Lease Net Of Above Market Lease And Accumulated Amortization Year Two 2022 Below Market Lease Net Of Above Market Lease And Accumulated Amortization Year Three 2023 Below Market Lease Net Of Above Market Lease And Accumulated Amortization Year Four 2024 Below Market Lease Net Of Above Market Lease And Accumulated Amortization Year Five 2025 Below Market Lease Net Of Above Market Lease And Accumulated Amortization Year Six Thereafter Below Market Lease Net Of Above Market Lease And Accumulated Amortization After Year Six Net increase to rental revenues Below Market Lease Net Of Above Market Lease And Accumulated Amortization Finite lived intangible assets amortization expense increase decrease. Increase to amortization expense: Finite Lived Intangible Assets Amortization Expense Increase Decrease [Abstract] Remainder of 2020 Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year 2021 Finite Lived Intangible Assets Amortization Expense Year Two 2022 Finite Lived Intangible Assets Amortization Expense Year Three 2023 Finite Lived Intangible Assets Amortization Expense Year Four 2024 Finite Lived Intangible Assets Amortization Expense Year Five 2025 Finite Lived Intangible Assets Amortization Expense Year Six Thereafter Finite Lived Intangible Assets Amortization Expense After Year Six Increase to amortization expense Percentage of interest purchased Business Acquisition Percentage Of Voting Interests Acquired Business combination, consideration transferred Business Combination Consideration Transferred1 Income (loss) from investment Estimated useful life Property Plant And Equipment Useful Life Impairment related to long-lived assets Impairment Of Long Lived Assets Held For Use Area of building to be constructed Write-down of costs related to demolished property and construction of industrial building Impairment Of Real Estate Number of reportable segments Number Of Reportable Segments Lessor operating lease payments to be received six years. Remainder of 2020 Lessor Operating Lease Payments To Be Received Remainder Of Fiscal Year 2021 Lessor Operating Lease Payments To Be Received Two Years 2022 Lessor Operating Lease Payments To Be Received Three Years 2023 Lessor Operating Lease Payments To Be Received Four Years 2024 Lessor Operating Lease Payments To Be Received Five Years 2025 Lessor Operating Lease Payments To Be Received Six Years Thereafter Lessor Operating Lease Payments To Be Received Thereafter Total Lessor Operating Lease Payments To Be Received Proportion Of Taxable Income Distributed. Income Tax Holiday, Description Income Tax Holiday Description Proportion Of Taxable Income Distributed to stockholders Proportion Of Taxable Income Distributed Uncertain tax positions Liability For Uncertain Tax Positions Current Standard maximum deposit insurance amount Cash F D I C Insured Amount Number of operating leases. Number of operating leases Number Of Operating Leases Rental income Operating Lease Lease Income Percentage of rental income Concentration Risk Percentage1 Number of leases as lessor. Number of leases as lessor Number Of Leases As Lessor Aggregate future lease obligations Operating Leases Future Minimum Payments Due Incremental borrowing rate Operating Lease Weighted Average Discount Rate Percent Operating lease, right-of-use asset Operating Lease Right Of Use Asset Operating lease, right-of-use liability Operating Lease Liability Debt Instrument [Table] Debt Instrument [Table] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type Mortgage Loans On Real Estate Loan Type [Axis] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type Mortgage Loans On Real Estate Loan Type [Domain] Hartford accident and indemnity company. Hartford Accident and Indemnity Company, Loan [Member] Hartford Accident And Indemnity Company [Member] Five point two three percent interest peoples united bank. 5.23% People's United Bank, Loan [Member] Five Point Two Three Percent Interest Peoples United Bank [Member] Four point one eight percent interest, peoples united bank. 4.18% People's United Bank, Loan [Member] Four Point One Eight Percent Interest Peoples United Bank [Member] American international group. American International Group, Loan [Member] American International Group [Member] Allstate Life Insurance Company Member Allstate Life Insurance Company, Loan [Member] Allstate Life Insurance Company [Member] Three point eight two percent interest united states life insurance company loan. 3.82 % United States Life Insurance Company, Loan [Member] Three Point Eight Two Percent Interest United States Life Insurance Company Loan [Member] Three Point Four Five Transamerica Life Insurance Company Loan One. 3.45% Transamerica Life Insurance Company, Loan One [Member] Three Point Four Five Transamerica Life Insurance Company Loan One [Member] Four point two five percent interest united states life insurance company. 4.25 % United States Life Insurance Company, Loan [Member] Four Point Two Five Percent Interest United States Life Insurance Company [Member] Three Point Four Five Transamerica Life Insurance Company loan two. 3.45% Transamerica Life Insurance Company, Loan Two [Member] Three Point Four Five Transamerica Life Insurance Company Loan Two [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Mortgage notes payable Secured Debt Unamortized loan costs Unamortized Debt Issuance Expense Mortgage notes payable, net Long Term Debt Interest Rate Debt Instrument Interest Rate Stated Percentage Maturity Debt Instrument Maturity Date Counterparty Name Counterparty Name [Axis] Counterparty Name Repurchase Agreement Counterparty Name [Domain] Peoples united bank loan agreement. People's United Bank Loan Agreement [Member] Peoples United Bank Loan Agreement [Member] Long-term Debt, Type Longterm Debt Type [Axis] Long-term Debt, Type Longterm Debt Type [Domain] American international group loan. AIG Loan [Member] American International Group Loan [Member] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] Piscataway, New Jersey. Piscataway, NJ [Member] Piscataway New Jersey [Member] Variable Rate Variable Rate [Axis] Variable Rate Variable Rate [Domain] Prime Rate [Member] Prime Rate [Member] Original interest rate. Original Interest Rate [Member] Original Interest Rate [Member] Debt Instrument Debt Instrument [Axis] Debt Instrument, Name Debt Instrument Name [Domain] Event of default. Event of Default [Member] Event Of Default [Member] Three Point Four Five Transamerica Life Insurance Company loan. 3.45% Transamerica Life Insurance Company, Loan [Member] Three Point Four Five Transamerica Life Insurance Company Loan [Member] Note Rate. Note Rate [Member] Note Rate [Member] Hartford accident and indemnity loan. Hartford Accident & Indemnity Loan [Member] Hartford Accident And Indemnity Loan [Member] Represents information pertaining to People's United Bank Loan. People's United Bank Loan [Member] Peoples United Bank Loan [Member] Permanent financing interest rate Debt Instrument Interest Rate During Period Permanent financing period Debt Instrument Term Payment term based on amortization schedule Debt Instrument Convertible Remaining Discount Amortization Period1 Debt instrument, payment terms Debt Instrument Payment Terms Debt Instrument, balloon payment due upon maturity Debt Instrument Periodic Payment Terms Balloon Payment To Be Paid Number of collateralized properties. Number of collateralized properties Number Of Collateralized Properties Number of properties acquired. Number of properties acquired Number Of Properties Acquired Number of wholly owned subsidiaries. Number of wholly-owned subsidiaries of the UPREIT Number Of Wholly Owned Subsidiaries Loan Prepayment Premium Percentage calculated on the outstanding principal amount of loan facility or the then present value of the note in event of prepayment. Increase in debt instrument interest rate upon default. Debt instrument interest rate upon default. Debt instrument interest rate over the original interest rate up on default. Loan Prepayment Premium Percentage,upon providing advance notice of prepayment Loan Prepayment Premium Percentage Application fee to lender Loan Processing Fee Event of default, description Default Longterm Debt Description Of Violation Or Event Of Default Increase in debt instrument interest rate upon default Increase In Debt Instrument Interest Rate Upon Default Debt instrument Interest rate upon default Debt Instrument Interest Rate Upon Default Debt instrument interest rate over original interest rate upon default Debt Instrument Interest Rate Over The Original Interest Rate Upon Default Debt Instrument Remaining Principal Payment Due Debt instrument remaining principal payment due Debt Instrument Remaining Principal Payment Due Business combination recognized identifiable assets acquired and liabilities assumed mortgage loans. Business acquisition, assumed mortgage Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Mortgage Loans Mortgage, bears interest rate Mortgage Loans On Real Estate Interest Rate Repayments of outstanding indebtedness Repayments Of Debt Mortgage, maturity date Mortgage Loan On Real Estate Final Maturity Date New borrowings Proceeds From Issuance Of Debt Long term debt maturities repayments of principal in year six. Long term debt maturities repayments of principal after year six. Remainder of 2020 Long Term Debt Maturities Repayments Of Principal Remainder Of Fiscal Year 2021 Long Term Debt Maturities Repayments Of Principal In Year Two 2022 Long Term Debt Maturities Repayments Of Principal In Year Three 2023 Long Term Debt Maturities Repayments Of Principal In Year Four 2024 Long Term Debt Maturities Repayments Of Principal In Year Five 2025 Long Term Debt Maturities Repayments Of Principal In Year Six Thereafter Long Term Debt Maturities Repayments Of Principal After Year Six Total Credit facility extended maturity period. Line Of Credit Facility [Table] Line Of Credit Facility [Table] Lender Name Line Of Credit Facility [Axis] Line of Credit Facility, Lender Line Of Credit Facility Lender [Domain] Key bank N.A. Key Bank [Member] Key Bank N A [Member] Federal Reserve Bank of Cleveland. Federal Reserve Bank Of Cleveland [Member] Federal Reserve Bank Of Cleveland [Member] LIBOR [Member] London Interbank Offered Rate L I B O R [Member] Less than fifty percentage. If less than 50% of facility used [Member] Less Than Fifty Percentage [Member] More than fifty percentage. If more than 50% of facility used [Member] More Than Fifty Percentage [Member] Base Rate [Member] Base Rate [Member] Credit Facility Credit Facility [Axis] Credit Facility Credit Facility [Domain] Secured revolving credit facility. Secured Revolving Credit Facility [Member] Secured Revolving Credit Facility [Member] Line Of Credit Facility [Line Items] Line Of Credit Facility [Line Items] Line of Credit facility, maximum borrowing capacity Line Of Credit Facility Maximum Borrowing Capacity Line of Credit facility term Line Of Credit Facility Expiration Period Line of Credit facility extended maturity period Credit Facility Extended Maturity Period Line Of Credit facility description Line Of Credit Facility Description Line of credit facility minimum borrowing capacity. Applicable margin range on credit facility Debt Instrument Basis Spread On Variable Rate1 Line of Credit facility, commitment fee percentage Line Of Credit Facility Unused Capacity Commitment Fee Percentage Minimum principal amount Line Of Credit Facility Minimum Borrowing Capacity Swing loan Bridge Loan Line of credit facility additional extension option maturity date. Increase in line of credit facility available for property acquisition. Increase in line of credit facility available for property acquisition Increase In Line Of Credit Facility Available For Property Acquisition Line of credit facility, maturity date Line Of Credit Facility Expiration Date1 Line of credit facility, additional extension option maturity date Line Of Credit Facility Additional Extension Option Maturity Date Debt instrument basis spread reduction on variable rate. Reduction of applicable margin on credit facility Debt Instrument Basis Spread Reduction On Variable Rate Credit facility, outstanding Proceeds from secured revolving credit facility Stockholders equity note. Stockholders equity note. Stockholders Equity Note [Table] Stockholders Equity Note [Table] Share Repurchase Program Share Repurchase Program [Axis] Share Repurchase Program Share Repurchase Program [Domain] Share redemption program. Share Redemption Program [Member] Share Redemption Program [Member] Mackenzie tender offer. Mackenzie Tender Offer [Member] Mackenzie Tender Offer [Member] Self tender offer. Self-Tender Offer [Member] Self Tender Offer [Member] Plan Name Plan Name [Axis] Plan Name Plan Name [Domain] Incentive award plan 2007. 2007 Incentive Award Plan [Member] Incentive Award Plan2007 [Member] Incentive award plan 2017. 2017 Incentive Award Plan [Member] Incentive Award Plan2017 [Member] Title of Individual Title Of Individual [Axis] Title of Individual Title Of Individual With Relationship To Entity [Domain] Key Officers [Member] Officer [Member] Non employee directors. Non-employee Directors [Member] Non Employee Directors [Member] Award Type Award Type [Axis] Award Type Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Non-qualified stock options. Non-qualified Stock Options [Member] Non Qualified Stock Options [Member] Non employee directors and other officers. Non-employee Directors and Key Officers [Member] Non Employee Directors And Other Officers [Member] Restricted Stock [Member] Restricted Stock [Member] Derivative Instrument Derivative Instrument Risk [Axis] Derivative Contract Derivative Contract Type [Domain] Stock Options [Member] Stock Option [Member] Stockholders' Equity Note [Line Items] Stockholders Equity Note [Line Items] Shares of preferred stock authorized Par value per share (in dollars per share) Preferred stock, voting rights Preferred Stock Voting Rights Shares of common stock authorized for issuance Shares of common stock issued Shares of common stock outstanding Dividends Dividends [Axis] Dividends Dividends [Domain] Twelve months ended december thirty one twenty nineteen. 12 Months Ended 12/31/19 [Member] Twelve Months Ended December Thirty One Twenty Nineteen [Member] Three months ended march thirty one twenty twenty. 3 Months Ended 3/31/20 [Member] Three Months Ended March Thirty One Twenty Twenty [Member] Six months ended June thirty twenty twenty. 6 Months Ended 6/30/20 [Member] Six Months Ended June Thirty Twenty Twenty [Member] Declaration Date Dividends Payable Date Declared Day Month And Year Record Date Dividends Payable Date Of Record Day Month And Year Payment Date Dividend Payable Date To Be Paid Day Month And Year Dividend Per Share Common Stock Dividends Per Share Cash Paid Advance notice period required to provide to shareholders to amend suspend or terminate share redemption program. Advance notice period required to provide by shareholders to withdraw tendered shares. Maximum period allowed for paying redemption price in cash. Maximum redemption value per year. Stock redemption description. Stock redemption program redemption price per share percentage in net assets value. Yearly maximum redemption value Maximum Redemption Value Per Year Advance notice required to provide to shareholders amend suspend or terminate share redemption program Advance Notice Period Required To Provide Shareholders To Amend Suspend Or Terminate Share Redemption Program Advance notice required to provide by shareholders to withdraw tendered shares Advance Notice Period Required To Provide By Shareholders To Withdraw Tendered Shares Maximum period allowed for paying redemption price in cash Maximum Period Allowed For Paying Redemption Price In Cash Stock redemption description Stock Redemption Description Percentage of stock redemption program price per share in net assets value Stock Redemption Program Redemption Price Per Share Percentage In Net Assets Value Common stock redemption price per share. Common stock redeemed, shares Stock Redeemed Or Called During Period Shares Common stock redemption price per share Common Stock Redemption Price Per Share Aggregate consideration Stock Redeemed Or Called During Period Value Minimum redemption value per year limit requested. Stock redemption requests period, description. Stock redemption requests period description Stock Redemption Requests Period Description Minimum redemption value per year limit requested Minimum Redemption Value Per Year Limit Requested Aggregate redemption value. Stock non-redemption period, start date. Stock non-redemption period, end date. Stock non-redemption period, description. Aggregate redemption value Aggregate Redemption Value Stock non-redemption period, description Stock Non Redemption Period Description Stock non-redemption period, start date Stock Non Redemption Period Start Date Stock non-redemption period, end date Stock Non Redemption Period End Date Number of common stock offered Stock Repurchase Program Number Of Shares Authorized To Be Repurchased Share price Share Price Offer expiration date Stock Repurchase Program Expiration Date Number of shares tendered Repurchases - common stock Number of shares of common stock which may be awarded Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized Share-based compensation award plan , expiration date Share Based Compensation Arrangement By Share Based Payment Award Expiration Date Share based compensation arrangement by share based payment award effective date. Plan effective date Share Based Compensation Arrangement By Share Based Payment Award Effective Date Number of shares available for future issuance Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Stock options granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Vesting period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Stock options exercised Stock Issued During Period Shares Stock Options Exercised Stock options expired Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period Stock options granted exercise price Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Options expiration period Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period Stock compensation expense Allocated Share Based Compensation Expense Shares issued, grant date. Share based compensation arrangement by sharebased payment award equity instruments other than options aggregate value granted . Share based compensation arrangement by share based payment award award vesting description. Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Two thousand seven incentive award plan. 2007 Plan Two Thousand Seven Incentive Award Plan [Member] Two thousand seventeen incentive award plan. 2017 Plan Two Thousand Seventeen Incentive Award Plan [Member] Award Date Award Date [Axis] Award Date Award Date [Domain] Award grant date one. Award Granted on April 30, 2012 [Member] Award Grant Date One [Member] Award grant date two. Award Granted on June 7, 2012 [Member] Award Grant Date Two [Member] Award grant date three. Award Granted on March 21, 2013 [Member] Award Grant Date Three [Member] Award grant date four. Award Granted on March 21, 2013 [Member] Award Grant Date Four [Member] Award grant date five. Award Granted on June 6, 2013 [Member] Award Grant Date Five [Member] Award grant date six. Award Granted on June 4, 2014 [Member] Award Grant Date Six [Member] Award grant date seven. Award Granted on June 19, 2014 [Member] Award Grant Date Seven [Member] Award grant date eight. Award Granted on March 26, 2015 [Member] Award Grant Date Eight [Member] Award grant date nine. Award Granted on June 19, 2015 [Member] Award Grant Date Nine [Member] Award grant date ten. Award Granted on March 24, 2016 [Member] Award Grant Date Ten [Member] Award grant date eleven. Award Granted on June 9, 2016 [Member] Award Grant Date Eleven [Member] Award grant date twelve. Award Granted on May 22, 2017 [Member] Award Grant Date Twelve [Member] Award grant date thirteen. Award Granted on May 31, 2017 [Member] Award Grant Date Thirteen [Member] Award grant date fourteen. Award Granted on June 8, 2017 [Member] Award Grant Date Fourteen [Member] Award grant date fifteen. Award Granted on June 7, 2018 [Member] Award Grant Date Fifteen [Member] Award grant date sixteen. Award Granted on June 7, 2018 [Member] Award Grant Date Sixteen [Member] Award Grant Date Seventeen Member. Award Granted on June 5, 2019 [Member] Award Grant Date Seventeen [Member] Award Grant Date Eighteen Member. Award Granted on June 5, 2019 [Member] Award Grant Date Eighteen [Member] Award grant date nineteen. Award Granted on June 4, 2020 [Member] Award Grant Date Nineteen [Member] Award grant date twenty. Award Granted on June 4, 2020 [Member] Award Grant Date Twenty [Member] Certain executives. Certain Executives [Member] Certain Executives [Member] Non-management members of board of directors. Non-management Members of Board of Directors [Member] Non Management Members Of Board Of Directors [Member] Current and former executives. Current and Former Executives [Member] Current And Former Executives [Member] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Shares Issued, Grant Date Shares Issued Grant Date Total Shares Issued Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Value Per Share Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value Approximate Value of Shares Share Based Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Aggregate Value Granted Vesting Period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Description Share-based compensation arrangement by share-based payment award, share value for valuation purposes. Common stock value per share Share Based Compensation Arrangement By Share Based Payment Award Share Value For Valuation Purposes Unamortized stock compensation Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options Weighted average period for recognition Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Stock options outstanding Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Stock options exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number Outstanding at the end of the period (in shares) Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding Number Vested (in shares) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Non-vested at beginning of period, Shares Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Non-vested, new shares issued, Shares Vested, Shares Non-vested at end of period, Shares Non-vested at beginning of period, Weighted Average Grant Date Fair Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Non-vested, new shares issued, Weighted Average Grant Date Fair Value Vested, Weighted Average Grant Date Fair Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value Non-vested at end of period, Weighted Average Grant Date Fair Value Share based compensation arrangement by share based payment award equity instruments other than options nonvested number remainder of fiscal year. Share based compensation arrangement by share based payment award equity instruments other than options nonvested number fiscal year two. Share based compensation arrangement by share based payment award equity instruments other than options nonvested number fiscal year three. Share based compensation arrangement by share based payment award equity instruments other than options nonvested number fiscal year four. Share based compensation arrangement by share based payment award equity instruments other than options nonvested number fiscal year five. Share based compensation arrangement by share based payment award equity instruments other than options nonvested Number fiscal year six. Share based compensation arrangement by share based payment award equity Instruments other than options no vested number fiscal year there after. Remainder of 2020 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Remainder Of Fiscal Year 2021 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Fiscal Year Two 2022 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Fiscal Year Three 2023 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Fiscal Year Four 2024 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Fiscal Year Five 2025 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Fiscal Year Six Thereafter Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Fiscal Year There After Total Non-vested Shares Number of common share equivalents Weighted Average Number Diluted Shares Outstanding Adjustment Numerator: Net Income Loss Available To Common Stockholders Basic [Abstract] Net income attributable to common stockholders Denominator: Earnings Per Share Basic And Diluted Other Disclosures [Abstract] Weighted average common shares outstanding – basic Weighted average common shares outstanding – diluted Basic and Diluted Per Share Information: Earnings Per Share Basic And Diluted [Abstract] Net income per share – basic and diluted Schedule Of Related Party Transactions By Related Party [Table] Schedule Of Related Party Transactions By Related Party [Table] Related Party Related Party Transactions By Related Party [Axis] Related Party Related Party [Domain] Rochlin Organization(“TRO”). Rochlin Organization ("TRO") [Member] Rochlin Organization [Member] Represents Lighthouse Sixty, LP, a related party of the reporting entity. Lighthouse Sixty, LP [Member] Lighthouse Sixty Limited Partnership [Member] Garden 1101 [Member] Limited Partner [Member] Related Party Transactions [Line Items] Related Party Transaction [Line Items] Brokerage cash commissions Revenue From Related Parties Additional future lease payments Lessee Operating Lease Liability Payments Due Represents the annual rent under the lease agreement entered into by the entity with the related party. Current annual base rent under lease agreement Related Party Transaction Annual Rent Under Lease Agreement Aggregate lease payments Finance Lease Liability Lease expiration date Lease Expiration Date1 Investment in limited partnership Payments To Acquire Limited Partnership Interests Building acquired Initial distribution received from partnership, sale of the partnership assets Proceeds From Sale Of Buildings Realized gain from unconsolidated affiliate Gain from equity investment in limited partnership Gain Loss On Investments Represents the monthly installment payment for pension withdrawal liability. Represents the pension withdrawal liability term of payment. Loss contingency pension withdrawal liability term ending year. Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingency Nature Loss Contingencies By Nature Of Contingency [Axis] Loss Contingency, Nature Loss Contingency Nature [Domain] Represents the details pertaining to divestiture contingencies. Divestiture [Member] Divestiture [Member] Commitments and Contingencies [Line Items] Loss Contingencies [Line Items] Pension withdrawal liability Defined Benefit Pension Plan Current And Noncurrent Liabilities Monthly installment payment for pension withdrawal liability Loss Contingency Pension Withdrawal Liability Monthly Installment Payment Term of payment Loss Contingency Pension Withdrawal Liability Term Of Payment Term ending year Loss Contingency Pension Withdrawal Liability Term Ending Year Number of bus depot sites received final regulatory closure. Number of former bus depot sites. Remaining number of bus depot sites associated with environmental cleanup efforts. Number of bus depot sites compliance with environmental cleanup efforts. Number of bus depot sites received final regulatory closure Number Of Bus Depot Sites Received Final Regulatory Closure Number of former bus depot sites Number Of Former Bus Depot Sites Number of bus depot sites continuing monitoring and reporting activities associated with environmental cleanup efforts Remaining Number Of Bus Depot Sites Associated With Environmental Cleanup Efforts Number of bus depot sites compliance with environmental cleanup efforts Number Of Bus Depot Sites Compliance With Environmental Cleanup Efforts Rent and other receivables. Pension withdrawal liability. Fair Value By Balance Sheet Grouping [Table] Fair Value By Balance Sheet Grouping [Table] Mortgages [Member] Mortgages [Member] Measurement Basis Fair Value By Measurement Basis [Axis] Fair Value Disclosure Item Amounts [Default] Portion At Fair Value Fair Value Disclosure [Member] Fair Value Measurement Fair Value Disclosure Item Amounts [Domain] Estimate of Fair Value Measurement [Member] Estimate Of Fair Value Fair Value Disclosure [Member] Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Financial assets: Financial Instruments Financial Assets Balance Sheet Groupings [Abstract] Restricted cash Rent and other receivables Rent And Other Receivables Financial liabilities: Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract] Pension withdrawal liability Pension Withdrawal Liability Restricted cash and cash equivalents fair value disclosure. Mortgage notes payable fair value disclosure. Pension withdrawal liability fair value. Cash and cash equivalents Cash And Cash Equivalents Fair Value Disclosure Restricted cash Restricted Cash And Cash Equivalents Fair Value Disclosure Rent and other receivables Receivables Fair Value Disclosure Accounts payable and accrued expenses Accounts Payable And Accrued Liabilities Fair Value Disclosure Secured revolving credit facility Lines Of Credit Fair Value Disclosure Mortgage notes payable Mortgage Notes Payable Fair Value Disclosure Pension withdrawal liability Pension Withdrawal Liability Fair Value