Other odor treatments will mask the smell for awhile Good luck it's a tough job.. and pets don't belong in rentals. 

Plus one on the ozone machine for mitigating odors.

X who puts her nose 1 inch from the doorknob and smells it, then proclaims the whole house smells like smoke is very different than a true permeating odor of smoke throughout the unit.Having others come over and smell for it will give you (some kind of) an idea if it need to be abated (or not).Offering to let them out of the lease before move in (if turned down) seems to nullify the need to (try to) abate the smoke smell.

I'm sorry to hear about the lingering odor in your betrothed investment. 

Neighbor called regarding "strong odor".

I will be sending a letter requiring the cat to be removed.Alternatively, IF the cat is removed, and because they are otherwise good tenants and pay rent on time - I've permitting a new lease, if they are willing to put down a deposit that will pay for new wood floors and odor removal when they move out. 

,one start:http://www.biggerpockets.com/renewsblog/2012/11/5/...also start with : cat odors or cat smell or cat urine in the forum search.but after you get rid of smell, you need to seal the concrete before anything else.also, 2 dozens of donuts, some sample pets treats and couple hours of chit-chat at the local pet-shelter will get you more info about what is used in commercial pet settings. also regulations....also don't forget to get friendly with the building neighbors...

-Noticeable but not terribly strong pet odor throughout house, which according the guide, is considered damage...Things I'm not sure about:-Walls and doors are dirty in many parts of the house.

Turns out they had masked the odor pretty well with incense, perfume etc.

Many times, I asked for a dozen offers to go out and the agent never grumbled .....