Change a small business venue to a Residential Small Business

Also having this problem. First I couldn't open a business on a lot that my sim purchased because I couldn't assign the business to that lot, now I've sold the lot but can't change it to any other lot type because "small business venue" is greyed out. No one owns this lot. There is no option to sell it. No one can move into it. No one can run a business on it. What am I supposed to do now?? Is this save just completely cooked?