Haseko Corp. engages in the construction and management of real estate properties. It operates through the following businesses: Construction-Related, Service-Related, and Overseas-Related. The Construction-Related business specializes in condominium construction. The Service-Related business handles condominium management operations, repair work and interior remodeling, paid facilities for the elderly, consigned sales of condominiums, and brokerage operations. The Overseas-Related business engages in the real estate development and sales business outside of Japan. The company was founded by Takehiko Hasegawa on February 11, 1937 and is headquartered in Tokyo, Japan.