Ask the landlord if you can give estoppel letters to the tenants and then you'll at least know what the tenants think their lease is.  

Can we use just a generic letter of intent to purchase the property and also provide earnest money to seal the deal? 

i recieved a letter in the mail about an equity disbursement notification for $4000.

It's really easy to delineate on a prequal/preapproval letter if the lender has checked these things but many lenders just don't do it.  

I would mail her the 10 day letter (or whatever is your states protocol) when you can to put the pressure on.  

When I contacted her to get it removed, she kept giving me the run arounds for a month until I was served with an attorney letter representing HOA that this is a privacy violation.

Are you knocking on doors and attempting to speak with the owners, leaving marketing materials at the door, or are you just writing down addresses and sending letters at a later time?  

I prepared a letter of explanation with the desired outcome of setting a call or meeting to discuss but before I send the letter out what other tips or documents should I enclose to showcase my legitimacy as a buyer and my seriousness specific to this property?

When I did hire a lawyer due to a tenant problem they had me send two of the exact same letters, one by regular mail, and one return receipt where you get that green card back. 

My current plan is to draft an acceptance letter they must both sign with dollar value agreement for each to cover; however, her attorney notes that likely given DVPO, he forfeits that amount.