Today I received an  ALL-CASH offer from another investor for $350k closing next week if I accept.

Thanks, but what about the payments I receive?

Invoicing electronically throughout the whole bill, receive payment, deposit and reconcile cycle can ease the bookkeeping burden.

If your intent was to hold the property for productive use and you can demonstrate that wit past practice, documentation of conversations with your professionals, rental agreements, actual rent, etc then you could indeed do a 1031 because your intent was to hold and something external changed that intent.And the unsolicited offer is the gold standard of something that can change your intent. 

You are getting solid advice here from Edward, Doug and Joe.An additional way to how Joe suggested to receive 'rent credits' , I also like closing costs. 

The only reason why I went to the school I went too (Penn State) was because I was asked to play baseball, which I did for a year but I didn't receive a scholarship for playing, I just knew I wanted to play somewhere so I went..

I would ask your title company to make sure lease transfer documents are done or transfer the lease to your name or company name in the event you need to enforce lease terms against the tenants the leases are already in your name.  

I basically took pieces from the Realtors association 410-T, the Cozy documents that are $99, and other clauses I found. 

They offered a Multi-Level Marketing option which they annoyingly over-advertised would pay for the education in no time if I recruited others, but I couldn't shake the fact that if the education was so good then why wouldn't they advertise that with the wealth of knowledge I would be receiving that I could pay for the classes..

We are advertising our rental property and just received an inquiry from someone with a service animal.