Extension of the hotel building THE THREE CORNERS ANNA HOTEL*** at 14 Gyulai Pál u., 1085 Budapest. New hotel rooms have been created to match the image of the existing rooms. The VRV system has been renovated and a new VRV heating-cooling system has been installed in the entire courtyard wing, replacing the previous radiator system. The air handling units and the solar panel system were installed on the newly designed end slab. On the ground floor, the restaurant has been extended.