One World Trade Center is officially New York City's tallest building, at 1271 feet, today, and the Empire State Building is tipping its hat (or crown?) to its big buddy. Per the ESB's press people:

The Empire State Building will shine red, white and blue on Monday, April 30, 2012 in honor of 1 World Trade Center.

As 1 World Trade Center officially becomes New York’s tallest building, the Empire State Building, the world’s most famous office building and ancestor of all super-tall towers, welcomes its newer, taller cousin to the New York City skyline and salutes her.