You need a proof of funds or a pre-approval to go with any offer so if it's hard money, they will issue a letter.

Tenant estoppel letters should be used in the sale or purchase of any tenant-occupied real estate, whether residential or commercial. 

I left numerous contact me letters to speak to the owner to discuss options and potentially cash for keys.

We can fold 500 letters in about 10 minutes. 

WOW - Sorry I have no advice except maybe a cease and desist letter from an attorney? 

It is delinquent enough (Greater than 90 days but below 120 days(can't file first legal until after the 120th day by federal rule (Except under very very specific circumstances)) to where the lender or servicer has sent the breach letter (Notice of pending foreclosure) with an expiration date that the loan will be referred to a foreclosure filing (Trustee/attorney) if the borrower(s) don't cure the breach within that defined period of time.* A notice of default is not a letter sent by a creditor saying they are late.

You ignore the DNC at your peril, once I got 2 demand letters in the same month I paid them and decided to take it seriously.

This group (I will call it tier 1) have received letters from my attorney and communications have begun.

The syndicator is just a letter off from the word Lame.

Then I search the county records by their name to see if I can find their primary residence which is where you can send a letter.