Mansion is defined as condominium that contains more than five dweling units and is owned each owner. But mansion has never been defined from viewpoint of stock, and so many buildings deviating from original definition have come into existence. So we explicate real state of such buildings, and examine their roll for town planning and housing policy. Results are summarized as follows. 1. Buildings of devided ownership are mostly very small scale and locate in wider range in comparison with mansion. 2. Average scale of each devision is various and dwelling unit is as wide as 2 〜 3 units of mansion. 3. Devided form is complicated and unsuitable for distribution. 4. Owner mostly use building for himself, and ownership and residence unify.
