@Lynn Currie It depends on the system, for me, I was fine just taking the booking data and creating a calendar entry with the data that then fed everything downstream, however the more complex integration I did, was using iGMS as a listing aggregator then used their API to feed the booking details to Zapier and parsed it out to the calendar and other downstream pieces.   

Real estate, investing and banking is extremely complex.

The guidelines also state "if the mortgagor has filed a bankruptcy petition under Chapter 7, the mortgagee must obtain Bankruptcy Court approval.

You can non-renew and the tenant can move out, but if they do not move out then your recourse is through the courts via an eviction, and that is where you become stuck.

She mentioned this one 58 unit apartment complex that she has been trying to sell for years but for some reason she cannot sell it. 

If you are only trying to do it with apartments, you will likely be hard-pressed to find a complex that will allow it.This works best when the market has an abundance of units and sellers have a tough time finding good tenants.

Roofers I've had to take to court, plumbers who have replaced main sewer lines that have gone wrong..... it goes on and on and all were done without permit. 

Do you really think PA (or other state) law allows to enter to the property without the tenant where also tenants personal belongings without court eviction verdict first?

The rental portion will be treated the same as if your entire property was a rental, except only part of your expenses will count.And if this was not enough complexity, the fact that you live in this property adds extra rules to deducting some of the shared expenses.

@Brian DavisAs a general rule you would want an LLC in the state where the property is located as it will need situs in that state to be able to act in court,As some state have very low outside liability protection on their LLC it is recommended to have these LLC owned by a holding LLC in a good asset protection state.