Cost to gut rehab a triple decker

[Joe Schmoe]

Hello friends,

I'm preparing for a gut rehab a triple decker to convert to condos in the Boston area. I will need to hire an architect and a GC to convert to three middle to high end condos.  I'm looking for how to factor in for labor and materials/sft for the rehab. The structure is sound, but needs reconfiguring the layout, new roof, siding, and maybe adding a bathroom on each floor and finishing the basement.

Thanks!!