Keep everything professional and all communications in writing, letters-not by email or text messages or phone calls.

I'm sending out a few hundred yellow letters to multiple neighborhoods about 15 minutes from where I live. 

Think of it as the difference between "the letter of the law" (what it actually says) and case law (how it tends to be interpreted).If some shyster sees you're holding property in your name, you're "ripe for the pickin'".

Send them a letter telling them you found their house to be apparently vacant.

I recently got pre-qualified (waiting for the pre-approval letter any day now) for a mortgage on a residential property.  

Send them a letter telling them you found their house to be apparently vacant.

The P or Q letter sent a message and the tenant paid the second half of the rent plus the late fee without too much complaint.

So to summarize, My ultimate question to area RE Investors is what area or letter grade have you found offers the best bang for your buck in South KC for Multifamily?

@Jordan SantiagoYou can sell an Option to purchasePurchase and SaleLease plus optionHave a letter of intent to sell or lease, then create an assignable agreement.Make sure the assigned price is reasonable so new buyer can get a loan.

Or if the 2nd floor tenants are actually unreasonably noisy, send them a warning letter and then if no change, ask them to leave.That said, if you want to placate the first floor tenants you could have an "energy audit" by RISE Engineering where they look at the house especially in terms of heat loss and come up with a proposal to add insulation and other energy-saving features (and give you free LED light bulbs :).I'm not saying that insulation is the same as sound proofing at all.