real estate agent; realtor; real estate agency
Can refer to the business itself or the person working there. Often used for local high-street agencies.
I looked for an apartment at the real estate agency in front of the station.
He works for a real estate agent.
I went to a real estate agent to look for a new apartment.
I looked for an apartment at the real estate agency near the station.
I rented the apartment through a real estate agent.