During any given week, I’m told, 100 or more design buffs take self-guided tours of the San Francisco Federal Building (SFFB) by Pritzker Prize'winning architect Thom Mayne.

Nerd Alert: A new wave of developments in San Francisco show the danger of betting the urban future on high-tech. Every decade or so, an economic boom roils San Francisco. Self-appointed arbiters of cultural taste in this progressive and parochial city declare that gentrification is the most insidious urban danger of all. News flash! Our City will be trampled by newcomers who don't share Our Values. Photo © Shae Rocco San Francisco Mayor Ed Lee (foreground, center), Forest City Vice President Jack Sylvan (foreground, right), and others bike through Pier 70. Plans for the site call for food trucks, farmers'