§ 151

(D)   The landlord and tenant of any dwelling unit other than a single-family residence may agree that the tenant is to perform specified repairs, maintenance tasks, alterations or remodeling only if:
(1)   The agreement of the parties is entered into in good faith and not for the purpose of evading the obligations of the landlord and is set forth in a separate writing signed by the parties and supported by adequate consideration;
(2)   The work is not necessary to cure non-compliance with subsection (A)(1) of this section; and
(3)   The agreement does not diminish or affect the obligation of the landlord to other tenants in the premises.