A residential building, a gallery building, in plan view similar to C letter, consists of three rectangular segments with a height of 4 storeys. The facility is equipped with internal stairs and lifts, external spiral evacuation stairs and a green roof. Static and strength calculations as well as construction and workshop documentation of the steel structure of the facility consisting of modules prefabricated in Poland were carried out. The strength analysis of individual modules was carried out for assembly, transport and operating conditions. The social building is a passive structure with a heat transfer coefficient of U <0.08 W/m2 x K, which was confirmed by tests with a thermal imaging camera.