Hello, My Suggestions: --Remove the 1st basement stiffness check from the floor general settings, --You can combine the building separately in the foundation account, --Activate item 4.9.1.3.a for infill walls --Combine and group without curtain joints, -- Remove defined flooring where the stairs are located. -- Brace the stairs and solve them together with the building, -- It hasn't been overturned, -- Connect the columns that go down one floor on the ground floor without any external beam connection to the raft foundation by giving an elevation of 530 cm, (delete the column on the lower floor.) There is a 10.3 m level difference, the column can buck Increase the dimensions of these columns. --one. In the basement, DB17 should be separated by being supported on the other structure, --Don't forget the elevator machine floor, --You can reduce the moving loads of the floor in the attic, --After doing these, problems may still arise, if it does, you can increase the curtains in both directions. (since BKS=1) Unver ÖZCAN