Normal wear and tear is sun bleaching etc.   

Bleach will get rid of it, but if the source isn't eliminated it will come right back.   

Using bleach and ozone machines from Amazon you would have no idea the absolute hellish filth that once existed there.

If it really is cat urine and you have carpet in there, you may need to rip it out along with the pad, then check the subfloor and, if not too much damage (as in the urine hasn’t fully saturated the plywood), bleach, killz, an ozone unit, the replace/ reinstall the flooring.

The remediation contractor told me that I can just clean it up good w/ bleach water (wearing appropriate PPE) and have the duct work cleaned up and i'd be good to go. 

I vacuum with a shop vac twice, then I mop it with bleach water and let it dry, then I vacuum it again, then I lay the flooring.

@Lauren Kormylo I told the cleaning lady to wipe the walls in master bed with bleach, and next day I came the smell was gone.  

Deep clean the whole place, pull the fridge out and vacuum the coils, make sure all drains are working and sanitize them - stop and fill each sink with a mix of hot water, a splash of bleach, and several good squirts of Dawn dish soap.

Otherwise, the next part may break and you'll need another repair.Also, one tip--make sure you or the tenants do not use any of the bleach or chemical tank drop ins as these cause the seals to wear out/corrode prematurely and fail or leak.Best of Luck...

Maybe you could bleach the mold until then just in case?