Hi, Kris. Fellow Hoosier here. Well, really a Texan now as I've lived here for 35 years and love it, but Indiana is still dear to me.
I honestly didn't even realize there were franchised property management companies. But I've owned two franchise businesses among my several businesses, and known dozens of franchisees of various franchisors. For myself personally, I'll never do another franchise, but that's largely my personality. However, a franchise is only as good as the franchisor. What value do they provide? How will they speed up or limit your growth? What tools do they provide? Franchisors make everything sound great when you're looking at it, and when you do your due diligence, they'll carefully select which franchisees they let you speak with. But they do have to do public filings, so some of their success is a matter of public record. An attorney or business broker who understands franchise issues should be able to help you dig down into that. (Just be sure the broker isn't trying just to get you to close a deal on the business so he gets commission.)
Then there's a related issue of whether it even makes sense to buy a small business. Below a certain level, the money you'd spend to buy it could be better spent just starting your own operation. 20-25 clients doesn't seem like very many. I have ~30 rentals and one of my employees does the property management in-house. It takes maybe a third of a full-time employee's time, on average. Some weeks it eats up a lot of time, many weeks hardly any. If the average rent is $1200/mo and you're getting 8% of that, you're getting $96/mo per house, or roughly $2000-2500/mo. How much do you have to pay to buy this existing business that generates that revenue? (And remember, that's revenue, not profit - you have expenses out of that. How much of that do you have to pay to the franchisor? What are your other expenses?)
Usually, if a business owner wants to sell, there's a reason. Sometimes, it's that he's made so much money he just wants to go enjoy it, but that's not going to be the case here. I suspect this business is not really doing all that well. Furthermore, if you know what you're doing in property management, I suspect it wouldn't take you long to start from scratch and build a portfolio of 20-25 properties, without having to pay to buy that business.