It shall be unlawful to use or permit the use of any building or part thereof, hereafter erected, altered, converted or enlarged, wholly or in part, until a certificate of occupancy, applied for at the time of application for a building permit, shall have been issued by the Building Inspector. Such certificate shall show that such building, or part of a building, and the proposed use thereof, conform to the requirements of this chapter. It shall be the duty of the Building Inspector to issue a certificate of occupancy only when he is satisfied that the building, or part of a building, and the proposed use thereof, conform to this chapter and all other applicable codes and ordinances of the Borough. Such occupancy permits shall be granted or denied in writing within 10 days from the date that a written application is filed with the Building Inspector unless some additional time is agreed to by the applicant.