I work down the street from 611 Folsom. It’s not windowless, unless you look at it from the alley in back or the parking lot. From the street, it’s a pretty normal looking office building. Look at google maps, street view.
The ominous windowless building shown in the thumbnail on the map is an Pacific Gas and Electric relay station… Which is mildly famous for a large outage that happened because someone walked in and threw a bunch of disconnects in the right order to create maximum chaos. Who, was never answered.
