People are suffering from mail fatigue so your message needs to be of interest to them and they think they ought to be rewarded just for opening the envelope and reading your message.Your message needs to contain an offer of a proposition that solves a problem.

Real estate here is hot due to many factors and I am interested  in the opportunity which exists.  

You'll be taking all the risk, for only half the reward!

Well the website doesn't exist!  

My subsequent apartment purchases have been financed by increasing value of existing stock and refinancing. 

Use the loan that I just used to buy my first duplex in MN: Portfolio-Conventional Loan with only 3% Down Payment and NO Mortgage Insurance (yes this loan really exists).

I am unable to reach them - they are not picking up phones / nor answering the door.I would like to give them 2 options - Renew for 1 year (same terms as existing lease -- I got a standard residential lease from staples)Vacate the placeIs there any standard / legal cover letter that I can send via postal mail ? 

Asking price is 475,000 and we believe the existing mortgage to be just shy of that.  

Once a portal exists, creating an offering shouldn't be an issue.

What options have people used if say the existing tenants aren't fully moved out, or left it in a condition that needs repairs that the new tenants couldn't move in yet?