Properst Co., Ltd. engages in the real estate business. It operates through the following segments: Sales Development, Lease Development, Value-Up, and Others. The Sales Development segment develops and sells condominiums. The Lease Development segment handles the construction and sale of rental condominiums. The Value-Up segment manages the purchase, improvement, and sale of old income generating residences. The Others segment includes real estate business consignment and leasing business. The company was founded on December 18, 1987 and is headquartered in Tokyo, Japan.