There are no questions about the work of the staff. However, in case of emergency, it is not possible to use the bathroom. Since ordinary mortals cannot get there due to the fact that it is only for postal workers. I think it's nonsense. A public place, and there are no facilities for visitors in full.
All payments from individuals are accepted at the cash desks of the post office. Probably the only place in town. Beltelecom and the Tony grocery store are also located on the ground floor of this building, and BTI is located on the third floor.