There's quite a difference between making $58,000 a year and $270,000, and that huge gap is why some are now poking around to see how a San Francisco janitor has been pulling in the latter. The San Francisco Chronicle reports on Liang Zhao Zhang, who cleans the BART system's station at Powell Street and has a base salary of $57,945, per public records culled by Transparent California. But thanks to about $162,000 in hefty overtime pay and other compensation and benefits, Zhang raked in what amounts to $271,243 in 2015.