Ownership. An AU only shall be allowed in an owner-occupied single-family dwelling or in a detached structure on the same lot where the owner occupies one of the units as his or her primary residence. The owner/occupant must hold record title to at least 50% of the property on which the dwellings are located. No nonindividuals, such as partnerships, corporations, trusts, limited-liability companies or other entities, shall be eligible to receive an AU permit. The owner/occupant must occupy either the (larger) primary space or the AU. In the event the primary living space or the AU is no longer occupied by an individual owner/occupant, the AU shall expire and the use shall be removed six months after such cessation of occupancy, unless for good cause an extension of said time is granted, in writing, by the Building Department. Provided all relevant provisions of the AU building permit and certificate of occupancy are being complied with, the AU shall be deemed to run with the land and the rights thereunder shall pass to any successor in title who resides at the premises as his or her primary residence.