@pr3ttylady82 Sorry, totally missed your residential rental
You wrote that you repopulated with your saved Sims and homes so I wanted to double check you tried different lots and also different Sims. Sometimes There's so many different lot issues going on that the differences can be vital.
For example that thread that Sheri linked is always a very specific lot that's causing issues and it's easy to duplicate with that lot so I needed to be sure that's not your issue.
Could you describe the steps you are taking to place in detail ? Are you placing from the map or from build mode ? With Sims without them ? Do they not load from start or does it randomly stop working.
I've tried one of the houses from your gallery on that lot (enter build mode from map, place lot, exit to manage world) and that worked fine for me so it doesn't seem to be a lot problem as such.