They can introduce themselves face-to-face with the tenants, change the locks to control the property, get a copy of the lease from the tenant or sign a new one, etc.As for the old PM, it sounds like they owe you a copy of the lease and other paperwork (required by law), undelivered rent and security deposit, etc.I would compile your documentation and file a complaint with the Ohio real estate commission.

When looking for a mentor, what's something you think newer investors can do to add value to the relationship and make it mutually beneficial?

These loans are more time consuming, challenging on documentation, and other red tape than you can think of to be honest. 

Can the landlord provide documentation of their payment history?

My uncle has done 84 percent for the last 14 consecutive years (these numbers can be proven  and have been well documented) .

No lender will lend on a deal that doesn’t make sense.4) After the appraisal comes back you will get a document that outlines the amount to be borrowed and all fees that will be relating to the loan (I would suggest to ask for an example of this document when you are searching for an HML so you will know what fees are going to show up).5) Close the loan at a title company of your choice.6) Begin work and make draws on any repair balance.

There are several duplexes out there for sale and if you do it right, it can be financially beneficial for you.  

If it isn't done, then you need a certified document from the state filed at the county to perfect the lien.

What Are Joint Ventures, and Why Are They Beneficial in Real Estate?

A buyer agreement is the legal document that provides the agent with the assurance that he/she will get paid if they work with you to complete a real estate transaction.