I would consult a real estate lawyer since I am not one. 

If you are doing management and tenant placement yourself then you should have a lawyer prepare a Lease Agreement (i.e., "tenant contract") for you.

If the tenant has a lawyer on speed dial then why are they renting.

All of your assets are exposed and a lawyer will come after all of it.  

Well if you really want to do it right, you should speak to a local PM or lawyer who has done it before.

Also, please know that these will not necessarily be below market deals as the interest, penalties, and lawyer fees attached to these properties as a result of the default are significant.

I'd leave a message and tell them since they have not responded to your multiple inquiries and you have not received the rent they collected in a timely manner, that you will be contacting your lawyer as well as the licensing board to file a complaint.

Professional Services:  Fees paid to accountants, lawyers, or property management companies are deductible.What strategies have worked for you in maximizing deductions?

That's the beauty of lawyers.

But the headache: CPA said need to file tax of the SDIRA ; Lawyer who helped to setup LLC said you need not to file tax when you didn't get cash from SDIRA.Do we need to file tax for SDIRA or not?