Is there an IRS document that describes this, that anyone could point me to? 

Assuming this property is not a dog house in a war zone you will need to shell out significant cash to buy it and you will receive the same rent  as a leveraged property.

At closing you are going to sign a document stating that you will occupy the property within 60 days.

Never received a 1099-S.

As I am experienced with QuickBooks, let me talk about it:Enter all transactions as you receive them and not when you pay them:- Enter all rent as invoices- Enter all expenses as bills- Enter loans, closing, etc.IT is also called Accrual Basis.

Yes, one syndicator I invested with started to provide all documents, statements, distribution history and the like online.

What they have done with the LLC is pushed the custodian into a background role - simply documenting the IRA's single investment of the LLC, doing annual reporting and acting as gatekeeper for contributions, distributions and plan-to-plan transfers. 

Received a call from a direct mail letter, for a couple who lives in TN, owns a house in NJ that has been occupied by the same tenant for years.

I have one week ago and few days ago and I haven’t received a response.

We used a 25 year amortization schedule with 5 year terms and received attractive interest rates.