At least where I'm from, the cost of a property with a burned-out unusable house on it is always a shit-ton more than land value, since running utilities to a house site, dealing with the paperwork, etc. is way more expensive and precarious than the cost to bulldoze. If there was a house there you can just raze to foundation and rebuild it without having to trigger a clusterfuck with the utility company or septic re-evaluation.

Also if the house is at least mortgagable by someone then buyers will still bid the price up to infinity on debt even if the house is only usable for bulldozing. The land value itself is also way lower for places without a house since the land value is loanable in one case and not the other.