Finally some good news, mostly. I called planning and zoning and was able to catch the head guy in his office. He apologized for taking so long. He says that Mom's house/lot is rebuildable if something should ever happen to it. Although not in exactly the same spot where it is now, or the same size, but it is rebuildable. He will put that in writing and have it for me next week after the holiday, which I can then produce for any potential buyers.

Great! I left a message for my real-estate agent and once I get it in writing, maybe we can finally proceed.