During the term of this chapter, all landlords shall maintain the
same standards of service, maintenance, furniture, furnishings and
equipment in the housing space or dwelling unit as they provided or
were required to provide by law or lease at the date the lease was
entered into. Where services, care or maintenance or when the standards
of service, maintenance, furniture, furnishings and equipment in the
housing space or dwelling are not substantially maintained as specified
in this section, any tenant may file a complaint with the Rent Control
Board pursuant to the procedures set forth in this chapter, which
complaint may include a request for reduction in the rent charged
to the tenant.