No person shall construct, erect, own, operate or maintain a sign, advertising structure or device not otherwise exempt pursuant to the provisions of section 646-7.2(a) of this Subpart, which advertises the principal business or principal businesses conducted on the property on which the sign is located without a permit from the commission.
N.Y. Comp. Codes R. & Regs. Tit. 6 §§ 646-7.4