Established in 1873, Gilbane, Inc. is one of the largest privately held family-owned companies in the construction and real estate industry. Gilbane Inc. comprises two operating companies, Gilbane Building Company and Gilbane Development Company. Grunau Project Development / GPD-Gilbane (formerly Grunau-Hunt) is Gilbane's North Central regional office. Based in Milwaukee, Gilbane's North-Central office has been providing construction management services throughout Wisconsin since 1978.