You'll also want to know if the company obtains the demo permits and pays for the dumpsters.
Here at the the Jersey Shore, I had bids for a tear down of a waterfront cape cod. it was about 1800 sq ft and the estimates came in from $12,000 to $25,000.
Keller Williams Atlantic
Contact the local fire department and talk to them about using the property to conduct training. In most events there are great tax benefits to allowing them to burn the house down for you - be sure to talk to an accountant about it first though. Good luck.