What was the biggest challenge for One Clinton, the $280-million combination library and luxury condominium project in Brooklyn? You could call it “the hole story.”
Workers had to excavate 50 ft at the site—shaped like Manhattan’s Flatiron building and near the foot of the Brooklyn Bridge—going that deep to avoid putting pressure on adjacent No. 2 and No. 3 subway tunnels. That effort alone took about six months to complete before the rest of construction could begin in earnest.