The issue is, after asking them, my neighbor/tenants will not update their mailing address to include the "1/2", so I am regularly getting their mail and placing it in their mailbox.

Some investors / flippers of very inexpensive vacant land do self-close, where the cost to close with a title company (most often requiring that you purchase title insurance, which comes with a minimum cost just for issuing a policy) approaches or exceeds the monetary value of the land. 

I travel the country for work so it’s not too much of an issue

It also had water drainage issues and no landscaping.

I think if you search student rentals many issues cross state lines.

When he registered online it canceled the other tenants account So we finally got this Corrected.His issue now is that the units should have separate addresses for fire purposes.

It was already under contract but I kept on good terms with the listing agent and when they had issues with the buyers I got to come in and take over How did you finance this deal?

But once you move out, there shouldn't be any issues using it for normal long term or midterm leases.  

I am having a mudjacking company jack up some concrete that is sloping towards the property, possibly causing most of the dampness issues.

Make sure there will be no issues renting the home.