(b) A landlord of a single family residence located in an undeveloped rural area or located where public sewer or water service has never been connected is not liable for a breach of (a)(3) or (5) of this section if the dwelling unit at the beginning of the rental agreement did not have running water, hot water, sewage, or sanitary facilities from a private system.
(c) The landlord and tenant of a one- or two-family residence may agree in writing that the tenant perform the landlord's duties specified in (a)(4), (5), (6), and (7) of this section. A tenant may agree to perform the duties specified in (a)(3) of this section in rental units where the rent exceeds $2,000 a month. They may also agree in writing that the tenant perform specified repairs, maintenance tasks, alterations, and remodeling, but the tenant may not agree to maintain elevators in good and safe working order. Agreements are allowed under this subsection only if the transaction is entered into in good faith and not for the purpose of evading the obligations of the landlord.
(d) The landlord and tenant of a 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 out in a separate writing signed by the parties and supported by adequate consideration; and
(2) the agreement does not diminish or affect the obligation of the landlord to other tenants in the premises.
(e) The landlord may not treat performance of a separate agreement described in (d) of this section as a condition to an obligation or performance of a rental agreement.