(B) Provided further that where a rental agreement or lease provision limits the number of occupants or limits or prohibits subletting or assignment, a landlord shall not endeavor to recover possession of a rental unit as a result of the addition to the unit of a tenant's child, parent, grandchild, grandparent, brother or sister, or the spouse or domestic partner (as defined in Administrative Code Sections 62.1 through 62.8) of such relatives, or as a result of the addition of the spouse or domestic partner of a tenant, so long as the maximum number of occupants stated in Section 37.9(a)(2)(B)(i) and (ii) is not exceeded, if the landlord has unreasonably refused a written request by the tenant to add such occupant(s) to the unit. If the landlord fails to respond to the tenant in writing with a description of the reasons for the denial of the request within 14 days of receipt of the tenant's written request, the tenant's request shall be deemed approved by the landlord. A landlord's reasonable refusal of the tenant's written request may not be based on the proposed additional occupant's lack of creditworthiness, if that person will not be legally obligated to pay some or all of the rent to the landlord. A landlord's reasonable refusal of the tenant's written request may be based on, but is not limited to, the ground that the total number of occupants in a unit exceeds (or with the proposed additional occupant(s) would exceed) the lesser of (i) or (ii):
(i) Two persons in a studio unit, three persons in a one-bedroom unit, four persons in a two-bedroom unit, six persons in a three-bedroom unit, or eight persons in a four-bedroom unit; or