Lots and Sims Disappeared

In the middle of the last hobby event, I logged into the lot where my Sims were woodworking and they had stopped progress and I could no longer access the basement of the lot where the woodworking stations were and the walls of the lot were gone. Also, the two ocean view lots next to this lot completely disappeared. When you access these lots now, they appear as the last lot that was visited. The sims that lived in these lots were deleted. I was not/am not above my Sim limit. 

I am wondering what I can do to restore my lots and sims.