Cat urine and spraying odors are nearly impossible to get rid of.  

I think we're going to do new doors, re-spray the interior of the cabinets and throw a new sink in and granite countertop.

At my own house, I get traps from the grocery store or that home shield spray from Home Depot. 

http://www6.homedepot.com/tool-truck-rental/Mold_F...The spray is salt based and 100% not toxic.Done right, all of the above is under $500 bucks and should cost you less than 1 day of your time.

And NO that will not be the final paint color - ceiling will be sprayed black and walls/flooring/mill work will match the Charlotte unit.  

Even if they spray a little paint on the trim or floors by accident it's not the end of the world, carpet gets replaced every 5 years anyways...Again though, these are not top of the line places, but the middle market as well so 40-50 years old and showing signs of age.

So, the $60/ hour to fix a doorbell became a $170 maintenance call once all is said and done.The problem isn't just the price of $60/ hour, its the trolling around the house looking for things to spray WD-40 on so he can bill another hour.

Also try Ozone treatments and Vamoose (a liquid product that can be used for cleaning, spraying, and through a fogger that is much like the Ozone method).

And when we painted the 2-story 26 unit building I managed, the painters sprayed the paint, so the tenants were required to keep their windows closed and they were not happy about it.  

I used spray foam to fill the rust holes and painted it white with a roller .