unfortunately I only know commercial contractors in FL so can't help you much there. Maybe Cuda knows some residential contractors in your area as well.
Is this a private seller or listed with a realator?
First I would check with the building dept in the area to see if there are any open permits on the address. If there were, find out the status of them and the contractors (name, address and ph #) that pulled them (general, plumbing, electrical, and any others that may apply) Playing the Devil's advocate here...If work was halted by the contractors there could be liens on the property for nonpayment by the owner.
If no permits have been pulled (this is probably the better senario for you), find a residential arch who can come up with some plans for the work you want to do and can be submitted for a permit by you or a general contractor.