Contractors that will give price per sq. ft. quote for gut remodel?

[Mike Levene]

Has anyone used a general contractor in the west Michigan area that is willing to give a quote for price per sq ft or a range of price per sq ft for a full gut remodel? For context, this would be for a property I already own.

I understand this may be a bit unconventional and people will likely recommend I get a proper quote and have the contractor do a full walkthrough. For a variety of reasons, including keeping this potential project "need-to-know" only right now, I want to get a ballpark estimate with full understanding that the goal posts could move in either direction as the project gets more discrete. 

Any referrals for contractors in the Grand Rapids area would be fantastic!