The South Tower was the second - tallest tower under construction in San Francisco .
Three months after San Francisco approved the project , construction began on the South Tower with a groundbreaking ceremony on November 10 , 2005 .
The South Tower was the second - tallest South Tower under construction in San Francisco .
Three months after San Francisco approved the project , construction began on the South Tower with a groundbreaking ceremony on November 10 , 2005 .