Gilbane, Inc., based in Providence, Rhode Island, is a family-owned, national construction and real estate development company. Forbes ranked Gilbane as the 108th largest privately held company in the United States in 2006 with estimated revenues of $2.83 billion.Gilbane is one of the nation’s oldest builders. The company was founded in 1873 by William H. Gilbane and his brother Thomas as a family-run carpentry and general contracting shop in Providence, Rhode Island.