Sash is thought to affect the common area and exterior of the building. Moving parts, so that both can not be shared. Gas, used to own part of the veranda is a common area of each dwelling unit. real estate, gardening is also allowed if the extent of the passageway for use as shelter. Two types of electrical wiring. Therefore it can not be changed arbitrarily. The floor is a communal area, dedicated space and drain pipe, making a hole in the floor storage areas are not concrete.