caretaker — A caretaker is a person whose job it is to look after a large building such as a school or a block of flats or apartments, and deal with small repairs to it.
superintendent — a person who oversees or directs some work, enterprise, establishment, organization, district, etc.; supervisor.
curator — A curator is someone who is in charge of the objects or works of art in a museum or art gallery.
steward — a person who manages another's property or financial affairs; one who administers anything as the agent of another or others.
warden — any of several pears having a crisp, firm flesh, used in cookery.
overseer — a person who oversees; supervisor; manager: the overseer of a plantation.
keeper — a person who guards or watches, as at a prison or gate.
supervisor — a person who supervises workers or the work done by others; superintendent.
protector — a person or thing that protects; defender; guardian.