The photographers behind the Caliber blog are recounting their latest encounter with the security guards at 555 California in San Francisco. Needless to say, the security guards were not happy to see two photographers taking pictures of their building. Read the Caliber account here.

Of course, as it is the case in the UK, security guards have no right to prevent photographers from working in front of their buildings, as while it might be a private property, the sidewalk or plaza in front of these buildings are not. The public has a right of way, and unless you somehow prevent their business operations, you are in your legal right to take photos there.