tri-level house - Palos, Illinois

This is a tri-level house. Home owner wants to get rid of existing ceiling joists on the first floor (kitchen/dining/living rms), and make is a vaulted /cathedral ceiling. Existing ridge is 2x6. The ridge is offset from the basement structure due to the large overhang on the front of the house. Need to have the beams designed, that will support the existing 1st floor roof.