http://www.greatbuildings.com/places/sf.html the architecture of san francisco is fun. here we have several buildings w/ several marks of history. the green one is 60's, the brick one is 1900's the blue on is 1990's and the tan one is 1930's. (don't bet on any of that, it's a guess, actually i think i remember them putting up the blue one, it is more like 2003)