Since 1873, Gilbane Inc. has been one of the largest construction and real estate companies in the United States. Based in Phoenix, Ariz., it comprises two operating companies: Gilbane Building Company and Gilbane Development Company. The building company offers a range of construction, consulting, preconstruction, subcontracting and management services. Its developmental services include public/private partnership, build-to-suit, real estate strategic planning as well as project and property management. Gilbane Inc. serves clientele in the corporate, health care, higher educational, sports and transportation markets.