The Board of Appeals may grant a variance for a nonconforming building, structure, or use incidental to the development of a subdivision or other construction project in any R District, including such accessory uses as a construction office, real estate sales office, and storage of materials and supplies located on the tract or lot to which such use is accessory. A temporary use permit for such use or building shall be issued only upon written agreement of the owner, or his or her agent, to remove such building or structure within 30 days after completion of construction or the issuance of a certificate of occupancy for the last house of a subdivision. Such temporary permit shall be issued for a period not to exceed three years and may be renewed annually at the discretion of the Board.