You're offering very favorable terms to a buyer (too good if you ask me, assuming $250k is a fair value) so they should be bending over backward and giving you everything you ask for and more.

That works out to $78.50 per month, and that's not unusual or exorbitant for combined water and sewer charges (in fact, where I live, I pay that much monthly for water only - we don't have sewer). $232 for 12 months of water would be a ridiculously low charge. 

Get a good tenant and bend over backwards to keep them happy.

J is right and property tax assessment isn't a good way to asses the value of a property, because it could be (and usually is) relevant to previous years (like 2006) where the market was in a total different form than what it is now.This reply is probably a bit late but judging by the information given here, this specific house is worth the min amount of 140k unless it went under some unusual disaster.

As Dion points out, you can have the right to review financials, unusual for a small loan especially where there is not a right to accelerate the loan upon the failure of management.

A friend of thought it was unusual that the lender insisted on an inspection.

Comparing this expansion to prior expansions shows that the length of this one is not unusual.

I only pay if there is an unusual infestation that requires professional treatment and if I can verify that it was not caused by the Tenants lack of proper house cleaning.

If not you've got them by the "short hairs".Actually, three weeks to close a loan is not unusual at all.  

You can ask for what ever you want and they may/may not agree to put it in the lease, then YES...... but as a landlord as soon as I see a prospective tenant trying to modify the lease, with a bunch of unusual "clauses", that's a big red flag for me , and unless I'm desparate, I'm moving on to the next tenant