One World Trade Center: New York City's Tallest Building

One World Trade Center, the centerpiece of the rebuilt World Trade Center complex in Lower Manhattan, stands as the tallest building in New York City and the Western Hemisphere.

Key Statistics

• Architectural height: 1,776 feet (541.3 m) — symbolic reference to 1776, U.S. Declaration of Independence.
• Roof height: 1,368 feet (417 m) — same as original 1 WTC North Tower.
• Occupied floors: 94 (floors 20–90 office, 91–99 mechanical/observation).
• Total floors: 104 (including mechanical).
• Completion: 2014 (construction 2006–2014).
• Architect: David Childs (Skidmore, Owings & Merrill).
• Developer: Port Authority of NY & NJ (owner), Durst Organization (co-developer).

Design and Engineering

• Tapered form: Square base → chamfered corners → octagon → square top; reduces wind loads 25%.
• Core: 30×30 m reinforced concrete (55–145 MPa) — houses elevators, stairs, utilities, provides torsional stiffness.
• Façade: Unitized curtain wall with prismatic glass; 130° corner chamfers create kaleidoscopic reflections.
• Sustainability: LEED Gold; rainwater harvesting, daylighting, recycled content, fuel cells.

Observatory and Public Access

One World Observatory (floors 100–102): 360° views, Sky Portal (live street view 100 floors below), dining, exhibits. 3.5M+ annual visitors.

Context in NYC Skyline

Surpasses Empire State Building (1,454 ft w/ antenna, 1,250 ft roof) and 432 Park Avenue (1,396 ft). Tallest in Western Hemisphere; 7th tallest globally (2024). Anchors Lower Manhattan's resurgence as 24/7 mixed-use district.