Osaka Municipal Housing Corporation adopted a new rental system applied to unoccupied units in old housing estates. These units were rented to previous and new tenants with ‘in-requirement of restoring to original state’, ‘hadaka-gashi’ and ‘multi-unit use’ for the reduction of first stage costs. From analysis of the content and activities of tenants of this enterprise, it was obvious that this was an excellent system with both ‘possibility for customizing space’ and ‘possibility for customizing process of forming living environment’. And the costs had been collected for less than two years, so it is good system for entrepreneur, too.