This corner plaza is located on the CBS Interactive (formerly Cnet) property on the corner at 235 Second Street and Clementina Alley. It's an intimate urban open space and though it feels a bit privatized it doesn't exclude the general public. The inside space is also a POPOS where you can hang out, though this fact is fairly obscure. If there was a cafe nearby this space would be much more active.
SPUR has done an excellent report on POPOS:
The 235 Second Street Plaza @ Clementina is urban and (semi)public.
|A view from the rear corner along Clementina.|
|235 Second is one of four POPOS on the northern half of Second Street.|
|The fountain along Second Street is a nice touch.|