198.048.  Different classifications of facility may exist on same premises, when. — A skilled nursing, intermediate care, assisted living facility, or residential care facility may exist on the same premises under the following circumstances:

  (1)  The skilled nursing, intermediate care, assisted living facility or residential care facility is an identifiable unit thereof, such as an entire ward or contiguous wards, wing or floor of a building or a separate contiguous building and such identifiable unit is approved in writing by the department;

  (2)  The identifiable unit meets all the reasonable standards for such facility;

  (3)  Central services and facilities such as management services, nursing and other patient-care services, building maintenance and laundry which are shared with other units are determined to be sufficient to meet the reasonable standards for such a facility.