The iconic Empire State Building lost a bit of its luster Monday, as it will no longer be the tallest building in the New York City skyline.

When construction workers put the latest steel columns in place at One World Trade Center, it will make the Freedom Tower's frame more than 1,250 feet high.

That is slightly taller than the observation deck at the Empire State Building.

The World Trade Center's Twin Towers were New York's tallest buildings from the 1970s until they were destroyed in 2001 in the Sept. 11 terrorist attacks.

When the new building reaches its full height in about a year, it will be the tallest in America, and the third tallest in the world.

Freedom Tower will stand 1,776 feet high and boast 104 floors. That is 408 feet taller than the Twin Towers.