You will want to consult with a lawyer.In regards to your last two questions here's some background on what makes a contract valid and enforceable:Offer: A promise to do or not do something within a certain time period Acceptance: A clear and direct statement that all terms and responsibilities are accepted Consideration: A legal and adequate inducement given in exchange for the promise Capacity: The parties to the contract must have the legal capacity and competency to contract Awareness: A party must be aware of the contract Legality: The contract must be legal in the jurisdiction it will be operating in***Not legal advice*** Steps I would take: -Review contract in detail to understand each counterparties responsibilities (if you are not aware)- Email a copy of the lease to each of the tenants listed on the lease and reiterate lease expectations for termination notice, rent payment etc. - If the lease was signed via Docusign (other esign may have same ability) - you can go to the envelope, go to history and view the IP addresses for each action taken.

Clearly, they failed in their primary responsibility to you as their layer of due diligence was a mere gossamer like patina.

I tried to skim most of the replies so I wouldn’t repeat what’s already been said but here’s my response to OP about real estate and retirement. 

It's more like any other long term holding strategy, with less out of pocket costs, quicker financing of the RE purchase and less responsibilities than a landlord has.

Hello Denis,I apologize for the delayed response; I’m new to the platform and still getting familiar with it.Let me quickly share a bit about myself.

This would help focus such a call/support for you and hopefully get you more and valuable responses.

In previous roles, I was responsible for the asset management, capital improvement, repair, and maintenance of an ANG Fighter Base worth over $400M.

Building a competent team is crucial, as many have pointed out.

Utilizing a wrap he has a mortgage note as an asset to offset the mortgage he’s still responsible for on the property.  

Thank you for the responses.