The only explanation is that it's out-of-towners thinking Clinton County is in New York, so the land must be worth it? 

Security deposit amountYou can find plenty of examples by searching for "tenant estoppel certificate doc" or exchanging "doc" with "pdf" for more options.Here is an example and explanation: Sample EstoppelSome have a lot of legal jargon but this document does not need to be so detailed.

Thank you all for your prompt reply and in-depth explanation.

Here is one of the explanations on a legal website operated by an attorney...""

@Joe Hammel Thanks for the explanation!

These allrequire applicants to submit an acceptable Letter of Explanation addressing each specific issue and occurrence.Rental HistoryBecause a current landlord may say anything to get rid of a bad tenant out of desperation, we also requireinformation for the previous landlord of all applicants.

Thank you for the in-depth explanation.

If you are buying as a primary be prepared to write an "LOE" Letter of explanation on why your moving out of an SFH into a MF 2-4 unit.

I'd appreciate if you could expound on your thought @JohnWarren  One simple explanation is that 1-4 units considered in Residential category.

Or put another way, I haven't seen any explanation of how that could be that makes sense to me.