Gran Torre Costanera

Gran Torre Costanera, previously known as Costanera Center Torre 2, and also known as El Costanera (The Costanera) by the locals, and previously known as Torre Gran Costanera, is a 62-story skyscraper in Santiago, Chile. It is the tallest building in South America, the second tallest building in Latin America (behind Mexico's T.Op Torre 1) and the fifth tallest building in the Southern Hemisphere (behind Indonesia's Autograph Tower and Luminary Tower, and Australia's Q1 Tower and Australia 108). The tower was designed by Chilean architects Alemparte Barreda & Asociados, the Argentine architect César Pelli and the Canadian company Watt International.

Details
Gran Torre Santiago is part of the Costanera Center complex, which includes the largest shopping mall in Latin America, two hotels and two additional office towers. Gran Torre Santiago is 300 m tall and 64 storeys high plus 6 basement floors, with a floor pitch of 4.1 m and 107.125 m2 in area. The tower has nearly 700,000 square meters of building space available built on 47,000 square meters of land. Planners estimated that there would be some 240,000 people going to and from the site each day. The tower was designed by Chilean architects Alemparte Barreda & Asociados, the Argentine architect Cesar Pelli of Pelli Clarke Pelli Architects, and by the Canadian company Watt International. Structural engineering is performed by the Chilean company René Lagos y Asociados Ing. Civiles Ltda. Salfa Corp. was responsible for its construction.

Pelli would use a similar design in the San Francisco's Salesforce Tower.

Construction
Construction of the building began in June 2006 and was expected to be completed in 2010, but was put on hold in January 2009 due to the global financial crisis of 2008–2009. Construction on the project resumed on 17 December 2009.

In early November 2010, standing 205 m tall, it overtook the neighboring Titanium La Portada to become the tallest building in Chile. In February 2011, La Segunda daily reported that, at 226 m tall, the tower had overtaken Caracas's Twin Towers to become the tallest building in South America, while La Tercera newspaper reported in February 2012 that it had achieved that feat on 12 April 2011.

Structural work on the tower was completed in July 2011 and the maximum height of 300 m was achieved on 14 February 2012, becoming the tallest building in Latin America. In 2013, the tower was completed.

Observation deck
On 11 August 2015 an observation deck, called "Sky Costanera," was opened to the public in floors 61 and 62, offering 360° views of Santiago.