Any such horse shall be owned or leased solely by the resident occupants of the lot who shall, upon written request of the Building Inspector, produce reasonable evidence, together with an affidavit of said ownership or lease, except that in extraordinary circumstances a horse, whatever its ownership, may be kept temporarily but in no event more than 30 days. The boarding or keeping of any other horse is strictly prohibited except as permitted in Local Law No. 2 of 1976, relating to the establishment of boarding stables.