janitor

n. custodian, maintenance man; gatekeeper

A janitor is a person who takes care of a building, such as a school, office building, or apartment block. Janitors are responsible primarily for cleaning, and often (though not always) some maintenance and security.
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Noun
1. someone employed to clean and maintain a building
(hypernym) custodian, keeper, steward

(n.)
A door-keeper; a porter; one who has the care of a public building, or a building occupied for offices, suites of rooms, etc.
  

N M
doorkeeper| porter; janitor