@Ian Cox I took a cursory look at Palm Beach, Lee, and Manatee Counties. It was enough of a look to know I'd better talk to someone who knows what they're doing before I learn a lesson the hard way. I'm also wondering what kind of due diligence I can realistically do from a distance.
@Mark Nolan, @Brian Eastman, @Justin Windham, if I'm only able to sock away $10,000+/- per year from a side business into a solo 401k, is it even worth it to set it up? Also, I'm assuming the (self)-employer contribution would go in one account and employee Roth contributions in another, and couldn't be used together, is that right?
@Royce J., @Wayne Brooks, I suppose I had been thinking that if it came down to it, I would either let the tax certificates expire or try to sell them to someone else (if that's even possible) if the property owners didn't pay the principle and interest within a year or so. Probably if I were to buy liens on a property with a house on it, intending to foreclose, I wouldn't want to do it in a 401k due to loss of rental depreciation. My thinking was to spread the risk across several small liens on nice, preferably mortgaged properties, hoping the owners or note-holders would pay up. And if I actually wanted to get properties out of a tax sale, go to a tax deed state and not use a 401k (unless it's undeveloped land). Am I thinking about this the right way? I obviously have a lot to learn.
Thank you everyone for your thoughtful comments and advice, I really appreciate it!