Haseko Corp. engages in the construction and management of real estate properties. It operates through the following segments: Construction-Related Business, Service-Related Business, and Overseas-Related Business. The Construction-Related Business segment specializes in condominium construction. The Service-Related Business segment 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 conducts real estate development and sales outside Japan. The company was founded by Takehiko Hasegawa on February 11, 1937 and is headquartered in Tokyo, Japan.