The seat of the local PZKO group in Mosty u Jablunkova dubbed „Kasowy“ is a gem of local architecture and it fits harmoniously into the landscape of the Beskydy mountain range. The building was constructed between the world wars, thanks to the endeavor of the local Polish community supported by the Raiffeisen Bank. It remained almost unchanged until the end of the 20th century. An extensive renovation commenced in 2007. The kitchen, the sanitary facilities, and the theatre hall were renovated and the windows were replaced. A gable roof covered by the imitation of shingles and complemented by numerous wooden elements with traditional carved details gives the building a character typical for the region. In 2016, a café on the ground floor was renovated and more rooms were constructed above the current bar – dressing rooms and sanitary facilities. Between 2019 and 2021, the building has been expanded, exhibition halls were constructed (a three-story gallery follows a theme of both everyday and festive life of the local mountain dwellers and also showcases their typical architecture), administrative rooms, and catering facilities. The house is surrounded by a garden. In the attic, there are guest rooms with utility rooms.