The NPCs are supposed to be fairly accurate – although some college NPCs are much more detailed than others and that would lead to greater accuracy. It’s worth trying them to see if you are within ballpark. We own a small business and have found that the NPCs are fairly accurate.
Also, I would think that if you own additional real estate and can calculate your equity in it, then adding the value of that equity to your assets and entering that number should work. @thumper1 , is there any reason why that wouldn’t work?