Paul Boutin <a href="http://paulboutin.weblogger.com/2006/12/22#a1649
“reported Friday that two buildings to meet the #3 in height in the US were proposed to the City of San Francisco. The Sears Tower and Empire State building would be the two taller structures. It’s actually 5 buildings in total – “… two 1,200-foot towers, two 900-foot structures and a 600-foot companion.”
Here’s the <a href="
http://sfgate.com/cgi-bin/article.cgi?f=/c/a/2006/12/21/BAGUNN44C07.DTL”Chronicle article about it. According to SFGate, the two towers will be 350 ft. taller than the Transamerica building. They are to be built at the corner of First and Mission. From my real estate research in the area, that’s about as seismically stable as you can get in San Francisco – right at the base of Rincon Hill – solid rock as opposed to the sandfill you find a few blocks away in South Beach.