As indicated in the previous answer, the best answer at this point is "it depends". The last building demolition I was involved with was over 10 years ago, and the cost then was about $10,000. It will probably be considerably more now. A major cost is not the demolition itself, but the "tipping" fees as the landfill where the demolished material has to be taken. If you indeed have "lots of land" it may be possible for you to bury some of the material (but not any hazardous material) somewhere on the property where you would not be building now or later. Check the statutes on that. As suggested in the other response, do get multiple offers. There are demolition companies listed in the yellow pages, but I'm not familiar with them. If you have a building contractor you trust, check with them.