captcha the addendum you have brought up is on par with others I have seen. You also did not mention if they were going to pay for a termite clearance. I have seen some that would not even do that, and they only gave a 10 day contingency period. Assume also they will not pay for repairs as well, you can try to ask for them, you never know. Also there is more then likely a penalty if you do not close on time for 100 bucks a day or something like that. Finally they will ask for a release of liability from mold, pests, acts of god, and pretty much anything and everything the planet can dish out.