The Dallas Development Code requires that "Except for single family and duplex uses, a person shall not use or change the use of a building, a portion of a building, or land without obtaining a certificate of occupancy from the building official."
A new CO is needed for:
•The first use of land or a building
•A change of use of land or a building
•A change of tenant on an existing CO, or
•An existing use increases or decreases floor area