CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 63,583	$ 41,529
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation	26,254	24,906
Amortization of Debt Issuance Costs	949	788
Other Amortization, including Stock Based Compensation	7,985	7,920
Equity in Loss of Joint Ventures	73	29
Gain on Sale of Real Estate	(34,645)	(13,993)
Straight-line Rental Income and Expense, Net	(5,482)	(2,898)
Increase in Tenant Accounts Receivable, Prepaid Expenses and Other Assets, Net	(7,617)	(4,452)
Decrease in Accounts Payable, Accrued Expenses, Other Liabilities, Rents Received in Advance and Security Deposits	(9,695)	(13,560)
Net Cash Provided by Operating Activities	41,405	40,269
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions of Real Estate	(23,877)	(142,380)
Additions to Investment in Real Estate and Non-Acquisition Tenant Improvements and Lease Costs	(62,136)	(55,813)
Net Proceeds from Sales of Investments in Real Estate	65,535	26,030
Contributions to and Investments in Joint Ventures	(741)	(339)
Increase in Escrow Deposits	(843)	(10,550)
Net Cash Used in Investing Activities	(22,062)	(183,052)
CASH FLOWS FROM FINANCING ACTIVITIES:
Financing Issuance Costs	(60)	0
Tax Paid on Shares Withheld	(5,126)	(5,944)
Common Stock Dividends and Unit Distributions Paid	(32,844)	(29,730)
Repayments on Mortgage Loans Payable	(1,273)	(1,257)
Proceeds from Unsecured Credit Facility	0	232,000
Repayments on Unsecured Credit Facility	0	(70,000)
Net Cash (Used in) Provided by Financing Activities	(39,303)	125,069
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(19,960)	(17,714)
Cash, Cash Equivalents and Restricted Cash, Beginning of Year	199,658	152,718
Cash, Cash Equivalents and Restricted Cash, End of Period	179,698	135,004
SUPPLEMENTAL INFORMATION TO STATEMENTS OF CASH FLOWS:
Interest Expense Capitalized in Connection with Development Activity	1,923	1,558
Cash Paid for Operating Lease Liabilities	798	727
Supplemental Schedule of Non-Cash Operating Activities:
Operating Lease Liabilities Arising from Obtaining Right-of-Use Assets	0	1,208
Supplemental Schedule of Non-Cash Investing and Financing Activities:
Dividends and Distributions Payable	36,118	32,857
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0
Assumption of Liabilities in Connection with the Acquisition of Real Estate	669	3,385
Accounts Payable Related to Construction in Progress and Additions to Investment in Real Estate	32,472	34,307
Tenant Improvements Funded by Tenant	15,992	0
Write-off of Fully Depreciated Assets	(5,283)	(6,195)
Noncontrolling Interests
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	1,385	895
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	(22)	(2,064)
Common Stock
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	2
Additional Paid-in Capital
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	22	2,062
First Industrial, L.P.
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	63,583	41,529
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation	26,254	24,906
Amortization of Debt Issuance Costs	949	788
Other Amortization, including Stock Based Compensation	7,985	7,920
Equity in Loss of Joint Ventures	73	29
Gain on Sale of Real Estate	(34,645)	(13,993)
Straight-line Rental Income and Expense, Net	(5,482)	(2,898)
Increase in Tenant Accounts Receivable, Prepaid Expenses and Other Assets, Net	(7,622)	(4,091)
Decrease in Accounts Payable, Accrued Expenses, Other Liabilities, Rents Received in Advance and Security Deposits	(9,695)	(13,560)
Net Cash Provided by Operating Activities	41,400	40,630
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions of Real Estate	(23,877)	(142,380)
Additions to Investment in Real Estate and Non-Acquisition Tenant Improvements and Lease Costs	(62,136)	(55,813)
Net Proceeds from Sales of Investments in Real Estate	65,535	26,030
Contributions to and Investments in Joint Ventures	(741)	(339)
Increase in Escrow Deposits	(843)	(10,550)
Net Cash Used in Investing Activities	(22,062)	(183,052)
CASH FLOWS FROM FINANCING ACTIVITIES:
Financing Issuance Costs	(60)	0
Tax Paid on Shares Withheld	(5,126)	(5,944)
Common Stock Dividends and Unit Distributions Paid	(32,844)	(29,730)
Contributions from Noncontrolling Interests	29	5
Distributions to Noncontrolling Interests	(24)	(366)
Repayments on Mortgage Loans Payable	(1,273)	(1,257)
Proceeds from Unsecured Credit Facility	0	232,000
Repayments on Unsecured Credit Facility	0	(70,000)
Net Cash (Used in) Provided by Financing Activities	(39,298)	124,708
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(19,960)	(17,714)
Cash, Cash Equivalents and Restricted Cash, Beginning of Year	199,658	152,718
Cash, Cash Equivalents and Restricted Cash, End of Period	179,698	135,004
SUPPLEMENTAL INFORMATION TO STATEMENTS OF CASH FLOWS:
Interest Expense Capitalized in Connection with Development Activity	1,923	1,558
Cash Paid for Operating Lease Liabilities	798	727
Supplemental Schedule of Non-Cash Operating Activities:
Operating Lease Liabilities Arising from Obtaining Right-of-Use Assets	0	1,208
Supplemental Schedule of Non-Cash Investing and Financing Activities:
Dividends and Distributions Payable	36,118	32,857
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0
Assumption of Liabilities in Connection with the Acquisition of Real Estate	669	3,385
Accounts Payable Related to Construction in Progress and Additions to Investment in Real Estate	32,472	34,307
Tenant Improvements Funded by Tenant	15,992	0
Write-off of Fully Depreciated Assets	(5,283)	(6,195)
First Industrial, L.P. | Limited Partner Units
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	1,389	895
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	(22)	(2,064)
First Industrial, L.P. | General Partner Units
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	62,176	40,584
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	$ 22	$ 2,064