(ii) Each such order shall expire upon termination of occupancy of the housing accommodation by the tenant to whom it is issued. The landlord shall notify the department of finance in the case of a household whose eligibility for such order is based on the fact that the head of such household is sixty-two years of age or older, or such agency as the mayor shall designate in the case of a household whose eligibility for such order is based on the fact that the head of such household is a person with a disability, on a form to be prescribed by such department or agency, within thirty days of each such termination of occupancy.
(iii) When a rent reduction order is issued by the state division of housing and community renewal, the amount of the reduction shall be subtracted from the rent payable by the tenant specified in a currently valid rent exemption order issued pursuant to this subdivision. The landlord may not collect from the tenant a sum of rent exceeding the adjusted amount while the rent reduction order is in effect.
(4) Any landlord who collects, or seeks to collect or enforce, rent from a tenant in violation of the terms of a rent exemption order shall, for the purposes of all remedies, sanctions and penalties provided in this chapter, be deemed to have collected or attempted to collect or enforce, a rent in excess of the legal regulated rent.