The existing building is a reinforced concrete construction designed in 1997 consisting of a basement, ground floor and two upper floors. With the reconstruction in 2013 elevator shaft, ladder core and ventilation cores have been added. The net surface of the existing levels is 2076.36m². In  the upgrade another floor was added to the steel structure. The upgrading was done with complete dismantling of the roof and roof construction. The surface of the added floor is 494.86m².