Are the workers in the apartment building area?

No. The apartment building department manages the apartments of flight attendants. A flight attendant is a rest place from the starting point (usually their unit) to the terminal, and then returns the same way after the rest, not a worker. The Housing Construction Department of the Railway Bureau is responsible for the planning and construction of railway residential areas, project supervision, property management, water and electricity payment, etc. It used to belong to various business fields of railways.