The DeMatteis Organizations is a family-owned and -managed group of businesses that provides construction services in New York and throughout the world. Its services include general contracting, renovation, and design/build delivery systems. The firm's portfolio encompasses work on luxury high-rise apartments, multifamily housing, office developments, landmark air rights towers, governmental and industrial buildings, combined-use structures, and specialty projects. Leon DeMatteis founded Leon D. DeMatteis Construction Corporation, the flagship business of the group that has grown to become The DeMatteis Organizations, in Brooklyn, New York in 1918.