While technically negotiable, the Sitzer/Burnett case revealed that the industry practice effectively standardized these rates.

Negotiating is a skill that needs to be practiced and consistently role played to get right.

@Gregory Banks I can offer some practical advice and referrals.

If so, can anyone recommend any best practices?

This is a practice by some less than reputable companies.

It's hard to harvest equity on these plays, unless you commit, long-term, towards very light leverage, as the only practical ways to benefit from the equity in your portfolio, if you plan to never sell it, only exchange it, for a lifetime, are to spend the cash flow, or cash out refi.

Find Brandon's videos on YouTube for the "four square" method of analyzing homes and practice.

Is it a normal practice to have a deal set up where you find a new place for the seller to move to?

There are some legal considerations as well as practical considerations 1.  

And while seller financing is a very common practice in business acquisition, the good deals are not being done with high levels of it.Particularly with smaller deals, and especially with a business like a laundromat, there are cash buyers out there.