The steel prefabricated structures are located on a two-storey reinforced concrete basement with an above-ground hall space with galleries and a structure of smaller, spatially variable workplaces hooked up by the frame of the building. A number of original details have been preserved in the interior to the present day, including brass elements at the counters or the paternoster. Another interesting detail on the ground floor are the doors behind the post office counters, which were originally the direct passage to the railways and the mail wagons. On the first floor gallery, the steel girders of the building can be seen very well. They are riveted and not claded. Otto Wagner already used this aesthetic in the Vienna Postal Savings Bank (Postsparkasse). However, in contrast to Brno, the building of the Postal Savings Bank was not intended to be dismantled and rebuilt.
The station post office of Bohuslav Fuchs is still a functional building, still fulfilling its initial function. If the main station will be moved some day, this post office building in this day probably won't move anymore, because a railway connection is no longer necessary for a post office building.
In October 2021 the building was bought by a company that assures the preservation of the functionalist character of the building.
Some more facts:https://www.bam.brno.cz/en/object/c123-brno-railway-station-post-office