This is a bit of a quest, but trust me, it's worth it.
Enter through the lobby at 23 Geary St. Tell the security guard you're here to see the rooftop garden. Insist - this is your legal right. Show your id (this is also a good time to ask for the bathroom key if you need to). Go up in the elevator.
You are now in one of San Francisco's loveliest Privately Owned Public Open Spaces (POPOS). Take some time to relax in this secluded rooftop garden and take in the view.
This is my favorite POPOS, but there are scores more built under the 1% Art program.