Cash for keys...you might start by offering to return their security deposit and allowing them to move on with "no harm, no foul."

In my book, that's no harm, no foul, and non-discriminatory. 

If I can't, no harm no foul but well always lose out if we don't try, right?

We've had expensive plantation blinds used as a chew toy, lawns ruined, doors replaced due to excessive scratching, and cat odor can get out of hand - some of these were found during routine inspections (and a few could have been prevented with more frequent inspections).We don't do pet deposits (deposit implies refundable) - we do nonrefundable pet fees and pet rent. 

The lady tenant is so foul mouthed and I am so not equipped to deal with people like that.

The Buyer can walk away, no fuss, no foul, and all he's out is the Option Fee.There are several key concepts.1) Set sale price regardless of what the market does. 

I called foul and backed off.Why would Uncle Sam have a tax rule that allows this?  

It's pretty rare that I have smokers sneak in and I'm not able to clean out the odor without much hassle.

The issue is with the AC system, when it's in the AC mode the house is being filled with bad odor that is coming from the vents.

In retrospect, everything appeared to be going well until I had reached the top of the roof whereby I could not help but notice a strong pungent odor emanating from a package rooftop unit operating on heat mode, an odor none other than 'Aldehyde', a byproduct of incomplete combustion of natural gas.