I have four rentals. Each cash flows about net $300-500/mo or <$22k/yr. ($750k value w approx $280k in equity.) In hindsight, I would have preferred to VTSAX and chill. I hire a property manager so I am not very hands on, but if/when something does happen, it wipes out entire year earnings. Ex: replacing windows…easily $4k. Turnovers and needing to renovate the place after 7 years… $15k.