Said employee was fired on the spot.In a Real Estate Office, a young man with long hair, dirty clothes and a bad odor walked in.

One of my biggest problems was the odor and damage that was left from the tenants dogs.

Check out Scoex 10 (scoex.10.com) when dealing with pet odors. 

I suggest Milpitas if you do not mind the foul sewage odor near the Bart.

Verify vent duct is unobstructed and sealed (and venting to the outdoors).Take humidity (and odor) control out of the hands of the tenant by installing a humidity and motion sensing switch (retrofit) or a humidity and motion sensing vent fan when time for replacement.

Then clean the walls and ceiling with TSP and repaint with an odor/stain blocker, such as Zinsser or Kilz.

We just went through this as we purchased a foreclosure with a smoking tenant in place who then remained for 18 years (and also turns out had a cat we didn't know about and could never smell due to the smoke odor).  

Besides, an odor in a house can be your best negative thing of a nice house.

I am not in town often, being a pilot, but my new place had this awful cigarette odor that every time I walked in, just hit me like a wall of stinky smoke.

For those people that throw up their hands and grumble "ble ble sunnyside!"