The proposed regs have knocked out all of my rental clients except one whose qualification is questionable since he is always juggling multiple business issues and the probability of him maintaining a  contemporaneous activity log is pretty low. For those of you with clients who might qualify, here is a step by step in depth analysis : https://www.forbes.com/sites/anthonynitti/2019/01/19/irs-publishes-final-guidance-on-the-20-pass-through-deduction-putting-it-all-together/?ss=taxes#553