Flooding is a holy mess: It's not just everything is wet. Everything up to the water height is essentially covered in poop, because urban flood water is heavily contaminated with raw sewage. In some parts of the country, it's also going to be contaminated with pig and cow manure.

They have to junk the walls and insulation, replace electrical outlets affected, clean and sterilize the floor or replace it if it's not cement. It's almost like a whole new building unless the frame is steel. I think most Costco stores are. They can also steam clean their merchandise racks.

I bet they wish they had graded the lot a few feet higher now!