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A building should be regarded as residential building when more than half of the floor area is used for dwelling purposes. Other buildings should be regarded as non-residential.

Commercial property refers to immovable property used for industry. Commercial property typically refers to a building that house businesses, land that is intended to make a profit, and larger residential rental properties.

A duplex house plan has two living units attached to each other, either next to each other as townhouses, condominiums or above each other like apartments.