Pricing for this can be a crapshoot depending on who you are vetting. One guy may come in at $145 sq/ft and then hit you with a truck full of extras. The next guy may be $215/ft and you'll be sharing seats at next years ballgames. Ask around, hit up Angie's List and the like; find friends, referrals or similar jobs done in your neighborhood. You should get some pretty fair pricing as building materials have come down a bit and lord knows how many hungry guys are willing to bid it. What are your finishes? Lot clearances? Machinery access? Parking? There are a lot of unknowns.
Make sure you get at leaset 2-3 estimates and ask for a copy of their insurance coverage, aka 'dec sheet', short for declaration sheet. This way you know how much they're covered for, PLUS, you have the name of their insurance company in case they do something wrong in your home.
Scott Miller, Realty Associates, Boca Raton, FL