Best mail piece for large multifam direct mail?

[Jack Tucker]

So I have developed a list of all multifamily commercial and residential properties in a specific area.  This is a gold mine waiting for a miner with the right tools.  I have 2 specific questions regarding the mailer. Does anyone have DATA about what is the best mail piece for a yellow letter... Not opinions, but DATA is preferred. 

STYLE/LOOK of the mail - Professional or personal look? Handwritten addresses? Handwritten letters? Heavy stock paper? Company logo? etc? Delivery via courier? Other ideas?

CONTENT of the letter.  Short and sweet? Professional?

I was thinking to put:  "Due to the recent sale of our multifamily property, we are seeking to purchase a property in this area like yours, using a cash 1031 exchange within the next few weeks." (yes, this is all true) ... Or something along those lines. This conveys urgency, some sophistication and ability to close since these are what may motivate the seller to call.

Does anyone have good style and content you are willing to share for this target asset class?  Again, I have opinions, but I'm looking for actual experience or split-test results.

Thanks in advance!