Business and apartment building with the passage "Black Rose"

By demolishing and redeveloping two construction sites, excluding the front part into the Trenches, a continuous rectangular passage from the Trenches to Panská Street was created, also emerging in its bend around the lodge into the future square (as prescribed by the state regulatory commission) and forming two commercial atriums, with a central hall space. The program and development were bound by the regulatory plan, which allowed a two-story development at the atriums, and for the building from the Trenches above the hall space with two staircases to have a four-story structure, creating a corner mass for the future square. For the building on Panská Street, a five-story front development with wings above the atrium was also to have two staircases. The construction of both buildings, carried out progressively, was realized as a concrete frame with infill masonry, designed for random loads in the ground floor of 2000 kg/m², and on the I and II floors on the terraces 600 kg/m². Above the space of both atriums, as well as above the central hall space, a segmental glass-concrete vault was constructed with two joints, including necessary expansion joints. The cross-armed vaults were dimensioned to a thickness of 7 cm, with a flat height of glass lenses of 13 cm in diameter, shaped as a gentle truncated cone, spaced 18 cm apart. The continuous terraces of the atriums, protruding 210 cm, are mounted to concrete consoles, with the floor of these terraces in the building to Panská Street made of glass-concrete, Luxfer system, while the building from the Trenches is made of steel plate, considering a higher degree of lightness, using 2 cm thick plates, measuring 20 x 20 cm, made of crystal glass, laid on French putty into metal grid frames made of rolled profiles.
The railings of all terraces were made of mirrored glass into metal profiles, with the façade to Panská Street made of glass with a wire insert. For both buildings, mechanical ventilation of all commercial and office rooms was planned, conducted in double gable walls. Ventilation of the atrium space is natural, located in the vaults' fronts and adjustable from the roofs of the atriums. The flat roofs of both buildings, as well as the café terrace above the lodge leading to the future square, were thermally insulated with "Isocoule" material, then waterproof insulation and asphalt paving (by Neuchatel Asphalte Company, Košice) in contour slopes towards the drainage gullies, similar in execution to road pavements. The treatment of the interior spaces of the atriums was carried out at Panská Street, while for the building from the Trenches, it was rejected, along with the proposed external coating of the movable walls of café constructions and their transparencies. Moreover, within the project limits, the design of circular columns in the I and II floors, the treatment of stairway walls, the chosen color of laid rubber on the stairs and in adjacent rooms, glazing method for doors and their divisions, as well as the specification of lighting fixtures from a lighting and constructivist perspective were not implemented. The proposed treatment in the floor of the large atrium, consisting of a longitudinal strip embedded in the pavement of the passage using water, colored light, and flowers was also not carried out. The reinforced concrete frame was carried out by the Prague Construction and Concrete Company Kracín.