If an apartment rental agreement specifies the maximum number of occupants in an apartment unit but does not contain any provision stating a specific dollar amount for an additional tenant occupying such apartment unit after the inception of the agreement, the landlord may exercise his or her rights under state laws or may raise the rent on such apartment unit a maximum of ten percent (10%) of the base rent for each additional tenant. If such additional tenant subsequently vacates the apartment unit, the rent shall be reduced by the amount that was imposed pursuant to the provisions of this section. This section shall apply only when there is a partial change in the occupancy of an apartment unit and one or more of the occupants of the apartment unit, pursuant to the rental agreement, still remains in lawful possession of the apartment unit. (1962 Code § 11-3.07; amd. Ord. 04-O-2449, eff. 6-18-2004)