the foster building is 50 first street, two blocks from the aronson building pictured above. still, the 50 first street site does have some pretty cool buildings sitting atop and i'll miss them very much.
https://goo.gl/maps/TD4vf
though i'm excited to see 50 first street rise, i love the feel of the old fidi and generally dislike everything past battery/1st street en route to the ferry building, everything that came up post war, basically (though with some big exceptions, including 1 front street, everything on sacramento and california north of front, etc. hate the SOM 1 bush and the phillip johnson buildings though for their contempt for market street and sf more generally) not because of any particular conservatism or nostalgia, but just because of the shit planning - appalling streetwall gaps, massive curb cuts and loading docks, terrible design with some exceptions, ludicrous private "public spaces" and de-activated streets (or walgreens). not to mention the wholesale demolition of great old buildings when we had thousands of acres of space to build intelligently. oh well.
if we're to lose a totally intact pre-war commercial streetwall, at least it's to something fairly impressive, rather than what's directly across the street at 55 first street, and similar atrocities issue of the 1980s.