The Company and Financial Statement Presentation (Policies)	9 Months Ended
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation. The Company's unaudited condensed consolidated financial statements are prepared on the accrual basis of accounting in accordance with GAAP. The financial statements reflect the accounts of the Company and its consolidated subsidiaries.
Variable Interest Entity	The Company consolidates the wholly-owned subsidiaries, partnerships and joint ventures which it controls (i) through voting rights or similar rights or (ii) by means other than voting rights if the Company is the primary beneficiary of a variable interest entity ("VIE"). Entities which the Company does not control and entities which are VIEs in which the Company is not a primary beneficiary are accounted for under appropriate GAAP.
Revenue Recognition	Revenue Recognition. The Company recognizes lease revenue on a straight-line basis over the term of the lease unless another systematic and rational basis is more representative of the time pattern in which the use benefit is derived from the leased property. Revenue is recognized on a contractual basis for leases with escalations tied to a consumer price index with no floor. The Company evaluates the collectability of its rental payments and recognizes revenue on a cash basis when the Company believes it is no longer probable that it will receive substantially all of the remaining lease payments. Renewal options in leases with rental terms that are lower than those in the primary term are excluded from the calculation of straight-line rent if the renewals are not reasonably certain. If the Company funds tenant improvements and the improvements are deemed to be owned by the Company, revenue recognition will commence when the improvements are substantially completed and possession or control of the space is turned over to the tenant. If the Company determines that the tenant allowances are lease incentives, the Company commences revenue recognition when possession or control of the space is turned over to the tenant for tenant work to begin. The lease incentive is recorded as a deferred expense and amortized as a reduction of revenue on a straight-line basis over the respective lease term. The Company recognizes lease termination fees as rental revenue in the period received and writes off unamortized lease-related intangible and other lease-related account balances, provided there are no further Company obligations under the lease. Otherwise, such fees and balances are recognized on a straight-line basis over the remaining obligation period with the termination payments being recorded as a component of rent receivable-deferred on the unaudited condensed consolidated balance sheets.
Use of Estimates	Use of Estimates. Management has made a number of significant estimates and assumptions relating to the reporting of assets and liabilities, the disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses to prepare these unaudited condensed consolidated financial statements in conformity with GAAP. These estimates and assumptions are based on management's best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. Management adjusts such estimates when facts and circumstances dictate. The most significant estimates made include the recoverability of current and deferred accounts receivable, allocation of property purchase price to tangible and intangible assets acquired and liabilities assumed, the determination of VIEs and which entities should be consolidated, the determination of impairment of long-lived assets and equity method investments, valuation of derivative financial instruments, valuation of awards granted under compensation plans, the determination of the incremental borrowing rate for leases where the Company is the lessee and the useful lives of long-lived assets. Actual results could differ materially from those estimates.
Cost Capitalization	Cost Capitalization. The Company capitalizes interest and direct and indirect project costs associated with the initial construction of a property up to the time the property is substantially complete and ready for its intended use within investments in real estate under construction in the unaudited condensed consolidated balance sheets. In addition, the Company capitalizes operating costs, including real estate taxes, insurance and utilities, that have been allocated to vacant space based on the square footage of the portion of the building not held available for immediate occupancy during the extended lease-up periods after the construction of the building shell has been completed if costs are being incurred to ready the vacant space for its intended use. If costs and activities incurred to ready the vacant space cease, then cost capitalization is also discontinued until such activities are resumed. Once construction has been completed on a vacant space, project costs are no longer capitalized.
Restricted Cash	Restricted Cash. Restricted cash is comprised primarily of cash balances held by lenders and operating cash reserves held at one property.
Fair Value Measurements	Fair Value Measurements. The Company follows the guidance in the Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") Topic 820, Fair Value Measurements and Disclosures ("Topic 820"), to determine the fair value of financial and non-financial instruments. Topic 820 defines fair value, establishes a framework for measuring fair value in GAAP and expands disclosures about fair value measurements. Topic 820 establishes a fair value hierarchy that prioritizes observable and unobservable inputs used to measure fair value into three levels: Level 1 - quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities; Level 2 - observable prices that are based on inputs not quoted in active markets, but corroborated by market data; and Level 3 - unobservable inputs, which are used when little or no market data is available. The fair value hierarchy gives the highest priority to Level 1 inputs and the lowest priority to Level 3 inputs. In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible, as well as considering counterparty credit risk. The Company has formally elected to apply the portfolio exception within Topic 820 with respect to measuring counterparty risk for all of its derivative transactions subject to master netting arrangements.The Company estimates the fair value of its real estate assets, including non-consolidated real estate assets, by using income and market valuation techniques. The Company may estimate fair values using market information such as recent sale contracts (Level 2 inputs) or recent sale offers or discounted cash flow models, which primarily rely on Level 3 inputs. The cash flow models include estimated cash inflows and outflows over a specified holding period. These cash flows may include contractual rental revenues, projected future rental revenues and expenses and forecasted tenant improvements and lease commissions based upon market conditions determined through discussion with local real estate professionals, experience the Company has with its other owned properties in such markets and expectations for growth. Capitalization rates and discount rates utilized in these models are estimated by management based upon rates that management believes to be within a reasonable range of current market rates for the respective properties based upon an analysis of factors such as property and tenant quality, geographical location and local supply and demand observations.
Recently Issued Accounting Guidance	Recently Issued Accounting Guidance. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848). ASU 2020-04 contains practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts that reference the London Interbank Offered Rate, or LIBOR, or another reference rate expected to be discontinued because of reference rate reform. The guidance in ASU 2020-04 is optional, applies for a limited period of time to ease the potential burden in accounting for (or recognizing the effect of) reference rate reform on financial reporting, in response to concerns about structural risks of interbank offered rates, and, particularly, the risk of cessation of LIBOR and may be elected over time as reference rate reform activities occur. As of March 31, 2020, the Company has elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. Application of these expedients preserves the presentation of derivatives consistent with past presentation. The Company continues to evaluate the impact of the guidance and may apply other elections as applicable as additional changes in the market occur.In July 2021, the FASB issued ASU 2021-05, Leases (Topic 842): Lessors-Certain Leases with Variable Lease Payments, to amend the guidance to provide alternative accounting for sales type and direct finance leases with variable lease payments. The amendments in ASU 2021-05 amend the accounting guidance to allow lessors to classify and account for a lease with variable leases payments that do not depend on a reference index or a rate as an operating lease if certain criteria are met. The standard is effective for fiscal years beginning after December 15, 2021 with early adoption permitted. The Company does not currently have any leases that are classified as sales-type or direct finance leases. Therefore, the Company determined that it will apply the amendment on a prospective basis to applicable leases that commence or are modified on or after July 1, 2021.
Lessor	Lessor Lexington’s lease portfolio as a lessor primarily includes general purpose, single-tenant net-leased industrial and office real estate assets. Most of the Company’s leases require tenants to pay fixed annual rental payments that escalate on an annual basis and variable payments for other operating expenses, such as real estate taxes, insurance, common area maintenance ("CAM"), and utilities, that are based on the actual expenses incurred. Certain leases allow for the tenant to renew the lease term upon expiration or earlier. Periods covered by a renewal option are included within the lease term only when renewals are deemed to be reasonably certain. Certain leases allow for the tenant to terminate the lease before the expiration of lease term and certain leases provide the tenant with the right to purchase the leased property at fair market value or a stipulated price upon expiration of the lease term or before. Accounting guidance under Topic 842 requires the Company to make certain assumptions and judgments in applying the guidance, including determining whether an arrangement includes a lease and determining the lease term when the contract has renewal, purchase or early termination provisions. The Company analyzes its accounts receivable, customer creditworthiness and current economic trends when evaluating the adequacy of the collectability of the lessee's total accounts receivable balance on a lease by lease basis. In addition, tenants in bankruptcy are analyzed and considerations are made in connection with the expected pre-petition and post-petition claims. If a lessee's accounts receivable balance is considered uncollectable, the Company will write-off the receivable balances associated with the lease to rental revenue and cease to recognize lease income, including straight-line rent, unless cash is received. If the Company subsequently determines that it is probable it will collect substantially all of the lessee's remaining lease payments under the lease term; the Company will reinstate the straight-line balance adjusting for the amount related to the period when the lease was accounted for on a cash basis. During the nine months ended September 30, 2020, the Company wrote off a deferred rent receivable balance of $615, as a reduction of rental revenue, related to a tenant that dissolved and surrendered its leased premises in an industrial property located in the Columbus, Ohio market. Certain tenants have been experiencing financial difficulties as a result of the COVID-19 pandemic. During the nine months ended September 30, 2020, the Company wrote off an aggregate deferred rent receivable balance of $1,383, as a reduction of rental revenue, related to tenants with rent collectability concerns. During the nine months ended September 30, 2021 and 2020, the Company wrote off an aggregate of $463 and $177, respectively, accounts receivable relating to certain tenants suffering from the current economic conditions. The Company determined that the lease and non-lease components in its leases are a single lease component, which is, therefore, being recognized as rental revenue in its unaudited condensed consolidated statements of operations. The primary non-lease service is included within rental revenue is CAM services provided as part of the Company’s real estate leases. Topic 842 requires that the Company capitalize, as initial direct costs, only those costs that are incurred due to the execution of a lease. As of September 30, 2020, the Company incurred $67 of costs that were not incremental to the execution of leases, which are included in property operating expenses on its unaudited condensed consolidated statements of operations. The Company incurred no leasing costs that were not incremental for the execution of leases as of September 30, 2021. The Company manages the risk associated with the residual value of its leased properties by including contract clauses that make tenants responsible for surrendering the space in good condition upon lease termination, holding a diversified portfolio, and other activities. The Company does not have residual value guarantees on specific properties.
Lessee	Lessee The Company, as lessee, has ground leases, corporate leases for office space, and office equipment leases. All leases were classified as operating leases as of September 30, 2021. The leases have remaining lease terms of up to 42 years, some of which include options to extend the leases in 5 to 10-year increments for up to 52 years. Renewal periods are included in the lease term only when renewal is deemed to be reasonably certain. The lease term also includes periods covered by an option to terminate the lease if the Company is reasonably certain not to exercise the termination option. The Company measures its lease payments by including fixed rental payments and variable rental payments that tie to an index or a rate, such as CPI. The Company recognizes lease expense for its operating leases on a straight-line basis over the lease term and variable lease expense not included in the lease payment measurement as incurred. The accounting guidance under Topic 842 requires the Company to make certain assumptions and judgments in applying the guidance, including determining whether an arrangement includes a lease, determining the term of a lease when the contract has renewal or termination provisions and determining the discount rate. The Company determines whether an arrangement is or includes a lease at contract inception by evaluating whether the contract conveys the right to control the use of an identified asset for a period of time in exchange for consideration. If the Company has the right to obtain substantially all of the economic benefits from and can direct the use of, the identified asset for a period of time, the Company accounts for the contract as a lease. The Company uses the information available at the lease commencement date to determine the discount rate for any new leases. The Company used a portfolio approach to determine its incremental borrowing rate. Lease contracts were grouped based on similar lease terms and economic environments in a manner in which the Company reasonably expects that the outcome from applying a portfolio approach does not differ materially from an individual lease approach. The Company estimated a collateralized discount rate for each portfolio of leases.

The Company and Financial Statement Presentation (Policies)

9 Months Ended

Sep. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation and Consolidation. The Company's unaudited condensed consolidated financial statements are prepared on the accrual basis of accounting in accordance with GAAP. The financial statements reflect the accounts of the Company and its consolidated subsidiaries.

Variable Interest Entity

The Company consolidates the wholly-owned subsidiaries, partnerships and joint ventures which it controls (i) through voting rights or similar rights or (ii) by means other than voting rights if the Company is the primary beneficiary of a variable interest entity ("VIE"). Entities which the Company does not control and entities which are VIEs in which the Company is not a primary beneficiary are accounted for under appropriate GAAP.

Revenue Recognition

Revenue Recognition. The Company recognizes lease revenue on a straight-line basis over the term of the lease unless another systematic and rational basis is more representative of the time pattern in which the use benefit is derived from the leased property. Revenue is recognized on a contractual basis for leases with escalations tied to a consumer price index with no floor. The Company evaluates the collectability of its rental payments and recognizes revenue on a cash basis when the Company believes it is no longer probable that it will receive substantially all of the remaining lease payments. Renewal options in leases with rental terms that are lower than those in the primary term are excluded from the calculation of straight-line rent if the renewals are not reasonably certain. If the Company funds tenant improvements and the improvements are deemed to be owned by the Company, revenue recognition will commence when the improvements are substantially completed and possession or control of the space is turned over to the tenant. If the Company determines that the tenant allowances are lease incentives, the Company commences revenue recognition when possession or control of the space is turned over to the tenant for tenant work to begin. The lease incentive is recorded as a deferred expense and amortized as a reduction of revenue on a straight-line basis over the respective lease term. The Company recognizes lease termination fees as rental revenue in the period received and writes off unamortized lease-related intangible and other lease-related account balances, provided there are no further Company obligations under the lease. Otherwise, such fees and balances are recognized on a straight-line basis over the remaining obligation period with the termination payments being recorded as a component of rent receivable-deferred on the unaudited condensed consolidated balance sheets.

Use of Estimates

Use of Estimates. Management has made a number of significant estimates and assumptions relating to the reporting of assets and liabilities, the disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses to prepare these unaudited condensed consolidated financial statements in conformity with GAAP. These estimates and assumptions are based on management's best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. Management adjusts such estimates when facts and circumstances dictate. The most significant estimates made include the recoverability of current and deferred accounts receivable, allocation of property purchase price to tangible and intangible assets acquired and liabilities assumed, the determination of VIEs and which entities should be consolidated, the determination of impairment of long-lived assets and equity method investments, valuation of derivative financial instruments, valuation of awards granted under compensation plans, the determination of the incremental borrowing rate for leases where the Company is the lessee and the useful lives of long-lived assets. Actual results could differ materially from those estimates.

Cost Capitalization

Cost Capitalization. The Company capitalizes interest and direct and indirect project costs associated with the initial construction of a property up to the time the property is substantially complete and ready for its intended use within investments in real estate under construction in the unaudited condensed consolidated balance sheets. In addition, the Company capitalizes operating costs, including real estate taxes, insurance and utilities, that have been allocated to vacant space based on the square footage of the portion of the building not held available for immediate occupancy during the extended lease-up periods after the construction of the building shell has been completed if costs are being incurred to ready the vacant space for its intended use. If costs and activities incurred to ready the vacant space cease, then cost capitalization is also discontinued until such activities are resumed. Once construction has been completed on a vacant space, project costs are no longer capitalized.

Restricted Cash

Restricted Cash. Restricted cash is comprised primarily of cash balances held by lenders and operating cash reserves held at one property.

Fair Value Measurements

Fair Value Measurements. The Company follows the guidance in the Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") Topic 820, Fair Value Measurements and Disclosures ("Topic 820"), to determine the fair value of financial and non-financial instruments. Topic 820 defines fair value, establishes a framework for measuring fair value in GAAP and expands disclosures about fair value measurements. Topic 820 establishes a fair value hierarchy that prioritizes observable and unobservable inputs used to measure fair value into three levels: Level 1 - quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities; Level 2 - observable prices that are based on inputs not quoted in active markets, but corroborated by market data; and Level 3 - unobservable inputs, which are used when little or no market data is available. The fair value hierarchy gives the highest priority to Level 1 inputs and the lowest priority to Level 3 inputs. In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible, as well as considering counterparty credit risk. The Company has formally elected to apply the portfolio exception within Topic 820 with respect to measuring counterparty risk for all of its derivative transactions subject to master netting arrangements.The Company estimates the fair value of its real estate assets, including non-consolidated real estate assets, by using income and market valuation techniques. The Company may estimate fair values using market information such as recent sale contracts (Level 2 inputs) or recent sale offers or discounted cash flow models, which primarily rely on Level 3 inputs. The cash flow models include estimated cash inflows and outflows over a specified holding period. These cash flows may include contractual rental revenues, projected future rental revenues and expenses and forecasted tenant improvements and lease commissions based upon market conditions determined through discussion with local real estate professionals, experience the Company has with its other owned properties in such markets and expectations for growth. Capitalization rates and discount rates utilized in these models are estimated by management based upon rates that management believes to be within a reasonable range of current market rates for the respective properties based upon an analysis of factors such as property and tenant quality, geographical location and local supply and demand observations.

Recently Issued Accounting Guidance

Recently Issued Accounting Guidance. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848). ASU 2020-04 contains practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts that reference the London Interbank Offered Rate, or LIBOR, or another reference rate expected to be discontinued because of reference rate reform. The guidance in ASU 2020-04 is optional, applies for a limited period of time to ease the potential burden in accounting for (or recognizing the effect of) reference rate reform on financial reporting, in response to concerns about structural risks of interbank offered rates, and, particularly, the risk of cessation of LIBOR and may be elected over time as reference rate reform activities occur. As of March 31, 2020, the Company has elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. Application of these expedients preserves the presentation of derivatives consistent with past presentation. The Company continues to evaluate the impact of the guidance and may apply other elections as applicable as additional changes in the market occur.In July 2021, the FASB issued ASU 2021-05, Leases (Topic 842): Lessors-Certain Leases with Variable Lease Payments, to amend the guidance to provide alternative accounting for sales type and direct finance leases with variable lease payments. The amendments in ASU 2021-05 amend the accounting guidance to allow lessors to classify and account for a lease with variable leases payments that do not depend on a reference index or a rate as an operating lease if certain criteria are met. The standard is effective for fiscal years beginning after December 15, 2021 with early adoption permitted. The Company does not currently have any leases that are classified as sales-type or direct finance leases. Therefore, the Company determined that it will apply the amendment on a prospective basis to applicable leases that commence or are modified on or after July 1, 2021.

Lessor

Lexington’s lease portfolio as a lessor primarily includes general purpose, single-tenant net-leased industrial and office real estate assets. Most of the Company’s leases require tenants to pay fixed annual rental payments that escalate on an annual basis and variable payments for other operating expenses, such as real estate taxes, insurance, common area maintenance ("CAM"), and utilities, that are based on the actual expenses incurred.

Certain leases allow for the tenant to renew the lease term upon expiration or earlier. Periods covered by a renewal option are included within the lease term only when renewals are deemed to be reasonably certain. Certain leases allow for the tenant to terminate the lease before the expiration of lease term and certain leases provide the tenant with the right to purchase the leased property at fair market value or a stipulated price upon expiration of the lease term or before.

Accounting guidance under Topic 842 requires the Company to make certain assumptions and judgments in applying the guidance, including determining whether an arrangement includes a lease and determining the lease term when the contract has renewal, purchase or early termination provisions.

The Company analyzes its accounts receivable, customer creditworthiness and current economic trends when evaluating the adequacy of the collectability of the lessee's total accounts receivable balance on a lease by lease basis. In addition, tenants in bankruptcy are analyzed and considerations are made in connection with the expected pre-petition and post-petition claims. If a lessee's accounts receivable balance is considered uncollectable, the Company will write-off the receivable balances associated with the lease to rental revenue and cease to recognize lease income, including straight-line rent, unless cash is received. If the Company subsequently determines that it is probable it will collect substantially all of the lessee's remaining lease payments under the lease term; the Company will reinstate the straight-line balance adjusting for the amount related to the period when the lease was accounted for on a cash basis. During the nine months ended September 30, 2020, the Company wrote off a deferred rent receivable balance of $615, as a reduction of rental revenue, related to a tenant that dissolved and surrendered its leased premises in an industrial property located in the Columbus, Ohio market.

Certain tenants have been experiencing financial difficulties as a result of the COVID-19 pandemic. During the nine months ended September 30, 2020, the Company wrote off an aggregate deferred rent receivable balance of $1,383, as a reduction of rental revenue, related to tenants with rent collectability concerns. During the nine months ended September 30, 2021 and 2020, the Company wrote off an aggregate of $463 and $177, respectively, accounts receivable relating to certain tenants suffering from the current economic conditions.

The Company determined that the lease and non-lease components in its leases are a single lease component, which is, therefore, being recognized as rental revenue in its unaudited condensed consolidated statements of operations. The primary non-lease service is included within rental revenue is CAM services provided as part of the Company’s real estate leases. Topic 842 requires that the Company capitalize, as initial direct costs, only those costs that are incurred due to the execution of a lease. As of September 30, 2020, the Company incurred $67 of costs that were not incremental to the execution of leases, which are included in property operating expenses on its unaudited condensed consolidated statements of operations. The Company incurred no leasing costs that were not incremental for the execution of leases as of September 30, 2021.

The Company manages the risk associated with the residual value of its leased properties by including contract clauses that make tenants responsible for surrendering the space in good condition upon lease termination, holding a diversified portfolio, and other activities. The Company does not have residual value guarantees on specific properties.

Lessee

The Company, as lessee, has ground leases, corporate leases for office space, and office equipment leases. All leases were classified as operating leases as of September 30, 2021. The leases have remaining lease terms of up to 42 years, some of which include options to extend the leases in 5 to 10-year increments for up to 52 years. Renewal periods are included in the lease term only when renewal is deemed to be reasonably certain. The lease term also includes periods covered by an option to terminate the lease if the Company is reasonably certain not to exercise the termination option. The Company measures its lease payments by including fixed rental payments and variable rental payments that tie to an index or a rate, such as CPI. The Company recognizes lease expense for its operating leases on a straight-line basis over the lease term and variable lease expense not included in the lease payment measurement as incurred.

The accounting guidance under Topic 842 requires the Company to make certain assumptions and judgments in applying the guidance, including determining whether an arrangement includes a lease, determining the term of a lease when the contract has renewal or termination provisions and determining the discount rate.

The Company determines whether an arrangement is or includes a lease at contract inception by evaluating whether the contract conveys the right to control the use of an identified asset for a period of time in exchange for consideration. If the Company has the right to obtain substantially all of the economic benefits from and can direct the use of, the identified asset for a period of time, the Company accounts for the contract as a lease.

The Company uses the information available at the lease commencement date to determine the discount rate for any new leases. The Company used a portfolio approach to determine its incremental borrowing rate. Lease contracts were grouped based on similar lease terms and economic environments in a manner in which the Company reasonably expects that the outcome from applying a portfolio approach does not differ materially from an individual lease approach. The Company estimated a collateralized discount rate for each portfolio of leases.