Sash is thought to affect the common area and exterior of the building. Dedicated space and drain pipes, gas pipes, the floor is a communal area, water supply, lease purchase can not be changed arbitrarily. Floor store to make holes in the concrete. Moving parts, so that both can not be shared. Veranda is available only for the portion of the common area of each dwelling unit. If a range is allowed, even gardening can be used as a passageway for the evacuation. Two types of electrical wiring.