Despite still being under construction, One World Trade Center in New York is already the tallest building in the city of skyscrapers.

The skyscraper which replaces the twin towers that fell during the September 11 attacks in 2001, will have 104 floors when it is completed and become one of the highest buildings in the Western Hemisphere.

The last pieces of its spire was expected to go up Monday, but due to the murky weather conditions, it will be delayed for another day.

The remaining spire pieces and a steel beacon will be lifted to finally cap the building at a later date, according to the Port Authority of New York and New Jersey.

The building will stand at a whopping 1,776 feet.

The spire weighs 800-ton and is 408 foot. The installation process began in December after 18 pieces were shipped to New Jersey from Canada. The spire will become a world-class broadcast antenna.

The skyscraper is expected to open in 2014 and will become the third largest building in the world.

One World Trade Center is the main building of the new World Trade Center located in Lower Manhattan, New York. Three other high-rise office buildings will be located at the New World Trade Center complex.

The new construction has been built to memorialize and rebuild the twin towers that were destroyed in the horrific terrorist attacks nearly 12 years ago.

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