The reconstruction of the building of the former military commandant's office near the Arsenal in Kiev at the address: 1 Mazepa, str. A large amount of work was performed by Osnova company under the contract. These are piles with a diameter of 1000 mm, retaining walls to strengthen the slope. To strengthen the existing foundation, laid in 1846, jet injection using cement mixture was carried out - the Jet-grouting technology. Powerful reinforced concrete belts were made at the level of the attic floor and the ceiling itself. A metal rafter system was installed, the elements of which were manufactured at the Steeltech plant.