My question, do I wait and see if they will really leave by the 15th of next month or simply pay the $900 to start eviction now (which will still take about 6 weeks to get them out) I am concerned that if I pay the $900 and then they leave 2 days later.

They simply don't allow the listing.If they do, they will remit taxes on your behalf.

The seller could simply retain the deposit.

Initially I had a feeling you didn’t really know what you’re talking about but now it’s crystal clear you have no idea what your saying and you are more than likely just another misleading , Detroit PM nightmare like 99% of the other PM’s in Detroit with all sorts of hidden fees, secret add-on’s who work against the tenant rather then with them so they end up vacating and you guys salvate over another nickel and dime placement fee.The question ‘why’ in your first comment has absolutely NOTHING to do with it I am simply sharing my experiences.

I’m simply trying to determine the best route to make that happen for her.

The easiest way to avoid the licensing issues is to simply lend money, or buy paper on investment properties. 90% of the states do not require a license to originate, lend, or buy and sell paper if the subject property is Non Owner Occupied, ie: Business Purpose Real Estate, ie Investment Property. 

You can't simply buy an interest in an LLC that owns real estate. 

There was simply too much building going on out there. 

200 nights per year is $20k, so a 5 year payback (looked at simply of course).Then also, would it add to your family's personal enjoyment?

As a private lender myself the "pitch" is simply the deal and the borrower.