@GraveSweeneys So I tested the two newest files
On the newest one I get an error code but it's fine when I try to load the second time although the game is still throwing last exception. I couldn't duplicate the issue with the house disappearing on that. Do you have issues on that as well ?
Now the other save is very strange. For some reason your Sims seems to live in one of the houses/rental units but I can't find them so I moved them to a random lot and build a basic house, saved the game and exited. On coming back it was all still there.
You do have the max rent issue on that save though so it's possible there's some kind of corruption going on.
I would also delete that scratch folder in your saves folder and if you're testing on a vanilla save, move that other folder from the mod to the desktop.
Do you have the issue on all your saves ?