Abstract
Condominium housing faces several problems regarding its stability and sustainability. This research focuses on Japan’ s first rental type Co-operative housing (rental co-op). Questionnaires and interviews were conducted with residents, owners and coordinators in order to evaluate the potential of this type of ownership. Particularly in multiple dwelling housing with a specific theme, rental co-op was found more suitable than condominium ownership because: 1) Owners and residents can choose new residents. 2) Owners can quickly make decisions about building maintenance and 3) Owners can evict delinquent residents. However, modifying the system of rent estimation for retirees who have lived there consistently is necessary.