His rational is that someone tries to sue me, they'll go for my total worth, regardless of how much equity I have in all my properties (all of them have 30 year fixed loans).

You have to "educate" your tenants on the concept and rational for the change which is not in their best economic interest, and offer them something in exchange for the higher rent, otherwise you are going to have a tough road ahead converting them.Your tenants have enjoyed both under market priced office space and underpayment of their fair share of operating expenses, and your ability to now up their rent by 30% and increase their expense reimbursement to market will not go over well no matter how eloquent you phrase your justification for the new higher rent and expense reimbursement.  

The following capitalized terms and phrases have the meanings described below:Buyers Information:Buyers Name:Buyers Address:Buyers Telephone Number:Sellers Information:Sellers Name:Sellers Address:Sellers Telephone Number:Property Information:Property:Purchase Price:Earnest Money:Closing Date:Possession Date:Tax Pro-ration Method: Customary method in county where propety is locatedClosing Agent:Real Estate located at Parcel No.1.

And, that's OK - after all, if you thought you'd make less selling leads for $1/qualified lead, we'd say you were irrational; but, you are undoubtedly experienced and rational, which is why I can logically infer you set it up to make more on a per lead rather than a back-end share.    

Don't ever try to rationalize your profit...only the sale price. 

The basic requirements as some of you may know are as follows (simple single family res.) 20% down, credit 720 and up, DEBT TO INCOME RATION of 36% or lower.

RUBS (Rational Utility Billing)-- I'm not sure it is legal everywhere though.

I considered my actions to be very honorable and way up and above what any other rational person would have considered to be considerate/human.   

If they aren't comfortable paying directly to the landlord, for whatever reason, then maybe make it rent vouchers, like the old style ration vouchers you see on history documentaries :)

It might be better NOT to have the owner there if they are family.Most people can be logical and rational.