You just can't kick them out.I recall the last rent controlled apartment I seen, it's in the 2nd floor of a building with several stores underneath.

It looks like the water damage might also affect the subfloor underneath the tub.

Or if at some point someone textured over wallpaper and painted it.Texas has expansive clay soil.

What do you do generally do in poor soil conditions:Crawlspace or Structural basement? 

This could cause problems down the road with soil erosion near the foundation and that would be bad.

Taking my GC today to crawl around underneath the thing.

So I pull up the carpet and pad, underneath I find stick on linoleum tile so I chisel that up and find painted hardwood - tile idea was scrapped and I spent a long weekend running to Home Depot to rent the sander and refinishing the floor.

I would think if you used all glue and not mechanical fasteners that over time the moisture migrating through the concrete from the outside soils would cause the glue to eventually delaminate.

Adding air vents in order to ventilate a crawl space in the summer introduces warm air underneath a cool house.  

We did find some major settling, but without an exploration of the foundation and underneath the deck, we wouldn't have discovered that it is an easy fix that he would have gotten hammered on, when he got to a retail sale.Also, I see that you are in Seattle!