apartment house is built, it is necessary to judge and to decide it geological features of the plan ground, the rental market value, and ..area.. therefore as these are the overall. It tends to leave the decision of the structure to the design office and the construction company. The design office and the construction company give priority and decide its own convenience to the structure. I think that the opportunity to know is also a little of shape and the structure. Various factors relate. It is a land-use project etc. of the regionality, the building scale, and insurable title. The load of land made a housing lot except the farmland in which property tax is not borne if there is not room neither or nor either the owner who thinks even about the construction of a building is interested in the structure is considerable. It becomes impossible to achieve real property therefore surely when it tries to build the building of the convex layer in