We bought a 3 unit this summer and are slowly renovating it to increase rents as the primary driver of cash flow increase. 

Regardless unless they have joined a wandering caravan that is going through the Gobi desert I believe mail gets delivered almost anywhere.

One unit will be delivered occupied paying 1200 month. 

If they deliver, all the better!

Also, most HOA covenants require a notice that there will be a vote on amending covenants and those notices must be properly delivered.

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Then they charged us the cancellation fee even though they couldn't deliver what was promised. 

You will need to document why you are keeping it in a letter that needs to be delivered to them within 30 days, unless the lease states otherwise, but not more than 60 per state law.

I have his SSN, drivers license and employer address.

- utility bill, driver’s license, etc.