Janitors, caretakers, and building superintendents clean and maintain the interiors/exteriors of buildings/surrounding grounds. Building superintendents are usually responsible for the operation of the establishment and may supervise others. They may advertise vacancies, show apartments/offices to prospective tenants, and collect rents.
Building superintendents employed in large establishments are responsible for the operation of the establishment and may also supervise other workers.
Here are some schools that have programs related to this career: