1. The health authority may exempt any hotel built prior to October 1, 1945, from having the number of water closets, bathtubs or showers required by this chapter for the following reason: The exemption will not result in detriment to the health of the occupants or to the sanitation of the building.
2. The health authority has no authority under this section to exempt any hotel or portion of a hotel built after October 1, 1945, from having the number of water closets, bathtubs or showers required by this chapter.