First Industrial Realty Trust, Inc. is a self-administered and fully integrated real estate company which owns, manages, acquires, sells, develops and redevelops industrial real estate. The Company is a Maryland corporation organized on August 10, 1993 and a real estate investment trust ("REIT") as defined in the Internal Revenue Code of 1986 (the "Code"). As of December 31, 2018, our in-service portfolio consisted of 171 bulk warehouse properties, 93 regional warehouse properties, 152 light industrial properties and 31 R&D/flex properties, containing an aggregate of approximately 60.7 million square feet of gross leasable area ("GLA") located in 21 states. Our in-service portfolio includes all properties that have reached stabilized occupancy (generally defined as properties that are 90% leased), developed and redeveloped properties one year from the date construction is completed and acquired properties that are at least 75% occupied at acquisition or one year from the acquisition date.
We began operations on July 1, 1994. The Company's operations are conducted primarily through the Operating Partnership, a Delaware limited partnership formed on November 23, 1993 of which the Company is the sole general partner (the "General Partner"), with an approximate 98.0% and 96.8% ownership interest ("General Partner Units") at December 31, 2018 and 2017, respectively. The Operating Partnership also conducts operations through the Other Real Estate Partnerships, numerous limited liability companies ("LLCs") and certain taxable REIT subsidiaries ("TRSs"), the operating data of which, together with that of the Operating Partnership, is consolidated with that of the Company as presented herein. The Company does not have any significant assets or liabilities other than its investment in the Operating Partnership and its 100% ownership interest in the general partners of the Other Real Estate Partnerships. Noncontrolling interest in the Operating Partnership of approximately 2.0% and 3.2% at December 31, 2018 and 2017, respectively, represents the aggregate partnership interest held by the limited partners thereof ("Limited Partner Units" and together with the General Partner Units, the "Units").
Profits, losses and distributions of the Operating Partnership, the LLCs, the Other Real Estate Partnerships and the TRSs are allocated to the general partner and the limited partners, the members or the shareholders, as applicable, of such entities in accordance with the provisions contained within their respective organizational documents.