They may see you as a competitive threat, be disappointed in their own progress or lack of success; who knows?

Typically, they cannot build and cash flow where the cash flowing housing stock is...I don't see new builds as a threat. 

An inspector can't make you correct or modify existing conditions unless there is a serious threat to safety.

Doing it a few months down the line will be more painful since they may think the threat of a change has passed.Good luck!

Otherwise, I recommend consulting an attorney if the threat of a lawsuit is real.

You'll have to have a thick skin to own low end rentals, and who doesn't like getting lawsuit threats from your tenants or letters/ phone calls from slip & fall lawyers?

I have not had the luxury to evict anyone in 9 years though I am sure my time is past due; the letters from an attorney or two that I have used commands complaince or the mere threat of an eviction.

I put a forsale sign up to get a response from them and I got it with a scared threat of me trespassing and them responding that they know the owners, which have been dead for 15 years now.

I'd start with a phone call to the tenants that would end with "If you are out by Friday,  apartment is clean and I never hear from/see you again,  I won't contact (insert threat here:your lawyer the press DCFS, LA child service,  all of the above  etc)" 

The seller is trying to screw over the buyer by *FORCING* him (with the threat of losing the deal) to pay for a service the buyer clearly wasn't interested in.The property may have needed pest work done, but I can't imagine what $8500 in pest remediation entails.