On Park Avenue, a $1 billion tower is set to soar

It's stepping-out time for 425 Park Ave., the 47-story, Norman Foster-designed office tower crowned by a trident of sky-piercing, 136-feet-tall illuminated fins. More than five years since the groundbreaking, L&L Holding Co.'s $1 billion gamble on Park Avenue's future just received its temporary certificate of occupancy from the Department of Buildings. It allows Ken Griffin's...