People tend to check in during these times:
Cool little park / garden on top of parking structure.
May is Asthma Awareness Month - please visit
Nice little park on a roof.
They are having a book fair today
This place has got nice bathrooms on the second floor. Handy on the way home from BART.
Sometimes have book fairs and events in the main lobby
There are "hidden" public bathrooms here. Walk north past the BACK door (interior/mall entrance) of 24 Fitness and it'll be a few paces up on the left.
This building has a convenience store dowstairs (Lake side).
Go up to the rooftop garden (off the second floor). Find a "KEEP OFF LEDGE" stencil. Take a picture of yourself on the ledge.