That's a crap shoot, but having a sharp negotiator representing you could pay big dividends.When it comes to offers, they will use mostly of the same components, but terms and conditions will vary by deal because no two deals are exactly alike - especially when it comes to terms and contingencies. 

If the GC that quoted you $50/sf looked at the place, I'd find another GC because they should be able to give you a fairly detailed estimate with a contingency.

Or make your offer contingent on interior inspection.

(timelines for contingencies, etc. )  If not, your inspection contingency timeline may already have started and will expire before bank responds. 

Either way, you can make that part of the agreement of sale, that the sale of the property is contingent upon the property being vacant.

Pre-approved lets you make cash offers without a financing contingency, which is very attractive to a seller.

.,  i usually use a percentage of rent for expenses and another for unforeseen contingencies. 

All appropriate contingencies are included.

The usual situation that arises are borrowers that have entered into a new contract with the contingency of first selling their current home.

I have the original purchase agreements with no contingencies on either side.