The lawyer says he is pretty confident but since he has not read the entire lease, he says he can review it at additional cost if needed.

But at the local commercial level, you’ll have a more in depth underwriting review process  

I plan to pull a standard lease agreement from the Florida Supreme Court website and review it with her next week.I have received a new job opportunity where I will be making an extra 40k annually and must move out of my home quicker than I initially expected.

Credit report - We review their credit report for payment history and ongoing bills.

I mean there is so much to scrutinize here we could spend an entire afternoon reviewing the actual deal let alone the financing.I wish you luck either way man.  

You may have your lawyer review the contract/property management agreement.

Once I get the homeowner to sign the assignment,  do you want to be the first option to review the numbers and possibly buy ?

You and your legal, tax and financial advisors should review this transaction in greater detail, especially the PLRs, to ensure you understand the significant risks involved and are structuring the transaction as close as possible to the PLRs to mitigate some of the risks.

Better Business Bureau reviews, etc.).Can I set up a self-directed Solo 401k if I have full-time job?

My suggestion would be to select someone with the most forum posts or most reviews.