does it seep underneath and ruin everything?

I' afraid the cat pee will ruin the floors. 

@Andy OkamotoOne cautionary note: if your idea of "cash flow" is $10K in net operating income, $120K before taxes in your pocket every year off your rental property, well, if it happens to you in 10 years, it will be a low-probability event with a lot of lucky breaks and eventually will likely ruin your life when you make a misstep because you assumed your lucky break was the norm.If you're serious about moving out here, at least look at the Pittsburgh area and its proximity to Carnegie Mellon (tech) and UPMC (health care).

Sellers have also told me that lawyers tell them that their credit is ruined anyway-no need to move yet. 

I'm noticing real estate agents and some others are spamming every post and it's really ruining the the quality of the discussion. 

This will financially ruin this couple if they lose this house and have an outstanding loan for $200,000.  

Many of these agents wouldn't want an inspector ruining the deal.

It can ruin a brain or nervous system for life.

I use over the range microwaves in all my rentals; it's just one less appliance renters need to bring and gains huge real estate in small kitchens, and the microwaves are almost the same cost as the hoods any more.As for the countertops the spots that always get ruined are the areas exposed to moisture; the clear poly repels the moisture and binds the sawdust together in the particleboard.

Usually in these cases I have expressed to my tenants that I need to fix the main concern first otherwise the replacement will just be ruined again.