Re: The 1st basement relative floor drift is high, the error is in the attached project First of all, correct the errors in the geometry control. K11 and k14 beams are not anchored to the beams they meet. (not merged). Once you fix them, your problem goes away. But I suggest you go for some improvement in the carrier system. For example, the beams did not center the columns and the continuities were not formed. The beams you made for the balconies became CONSOLE beams FROM BEAM. Avoid them. Solve the semi-rigid diaphragm. Your flooring loads are incorrect. There are walls on it. I haven't reviewed other issues. Good luck with.