If a Landlord submitted and received approval for a claim of exemption for a Rental Unit, is the claim of exemption permanent?

No. The annual process of Rental Unit registration includes filing an annual claim of exemption. If the claim of exemption and requisite supporting documents are not submitted by July 1 of each year for any Rental Unit, the Rental Unit shall be deemed to be subject to the provisions of the Ordinance. See SAMC § 8-3160(d).