Ants in apartment

4610  Small red/brown ants in my apartment. There are, other people in the building also have them. I’m certain there is a nest but i haven’t found it yet. I just want to know if getting an exterminator is worth it? Since they’re in this building. Also. Are they harmful to people? Thanks.

You should definitely have a pest professional do an inspection to determine what species of ants you have and the severity of the problem.  Different species of ants are treated differently.  If tenants have been spraying insecticides, the ant colonies could bud (split into new colonies) and invade new areas in the building.  The longer you wait to deal with the problem the more difficult it will be.