Except for rental units that may be occupied by others under § 12-503(a)(4) of this title, an authority: shall rent the housing units in a housing project only: to persons of eligible income, except for a reasonable number of housing units that may be occupied by management and security personnel; and at rentals within the financial reach of persons of eligible income; may not accept a person as a tenant in a housing project if the aggregate annual income of the person or persons who would occupy the housing unit exceeds the maximum income level established for persons of eligible income; and shall prohibit subletting by tenants.