If she wants to play in small claims court and waste everyone's time you can't stop her.

However, there are some additional steps involved with Section 8, like coordinating with the local housing authority.

I didn't see a Biggerpockets book on commercial properties (maybe there is one that I didn't find) and I don't know which book to buy or which author to trust on Amazon.

So, I’d dig into the numbers before making a call.Local zoning and code regulations: Converting a multi-family property to a single-family unit might require permits or specific approvals, so check with your local building authority to avoid surprises.

He plays the game and was able to let them use 100% of my lease agreements amounts.

Quote from @Alex Todd: @Basit Siddiqi and @Sean Graham let’s play this out a bit for discussions sake.$3M MF property, depreciation and mortgage interest are ~$180,000.

But you have to play the hand your dealt in areas you live and work in..

My clients and I have used Cost Segregation Authority with excellent results. 

Also, my personal investing goals & acquisition reflect a long term play and not a short term one.

I add people to my credit cards as authorized users for a fee.