The department, after consultation with the department of health services, shall develop a building code for previously constructed buildings converted to use as community-based residential facilities as defined in s. 50.01 (1g) which serve between 9 and 20 residents who are not related to the operator or administrator. In setting standards, the department shall consider the criteria enumerated in ss. 46.03 (25) and 50.02 (3) (b), and in addition shall consider the relationship of the development and enforcement of the code to any relevant codes of the department of health services. The objectives of the code shall be to guarantee health and safety and to maintain insofar as possible a homelike environment. Notwithstanding s. 101.121, a historic building as defined in s. 101.121 (2)
(am) which is converted to use as a community-based residential facility serving between 9 and 20 residents who are not related to the operator or administrator is governed only by the building code promulgated under this section.