Triangular 3

Source: wikipedia.org

Flatiron Building, New York City, New York, 1902 designed by Daniel Burnham

Named after the Fuller Construction Company, the “Fuller Building” quickly took on the Flatiron moniker, a nod to the building’s resemblance to an old-fashioned flat iron. Lion heads, Greek faces, fleur de lis and enveloping geometric designs adorn the terra cotta exterior, which recalls an Italian Renaissance palazzo. Once the most photographed building in New York, the Flatiron has been captured by Alfred Stieglitz, Edward Steichen, and countless tourists.  -- New York Magazine

Source: glasssteelandstone.com

Chicago Metropolitan Correctional Center(William J Campbell US Courthouse Annex), Chicago, Illinois, USA, 1975 designed by Harry Weese Associates

As Weese said, “The triangular plan provides the most perimeter for the space. We needed perimeter so each room could have an outside window.” It also cut out the need for long wasteful corridors. It’s a much more efficient way of organizing space.  -- Blueprint: Chicago

Source: som.com

Source: moma.org

National Commercial Bank, Jeddah, Saudi Arabia, 1983 designed by SOM

the geometry of the 766,000 sf headquarters building consists of a triangular 27-story office tower juxtaposed with a six-story, 400-car circular garage. The verticality of the bank tower is interrupted by three dramatic triangular courtyards chiseled into the building's façade. Office windows open directly onto courtyards with an inward orientation typical of Islamic traditional design.  -- architect's web site

Source: architectmagazine.com

388 Market Street, San Francisco, California, USA, 1983 designed by SOM

.... the tower, whose form comprises a cylinder and a prism joined together and echoes the circular and angular forms of the surrounding skyscrapers. -- ARCHITECT Magazine

Source: glasssteelandstone.com

Swissôtel , Chicago, Illinois, USA, 1988 designed by Harry Weese Associates

The Swissotel is a large silver glass tower with a triangular form that gives it interesting views both from within and without. The triangle shape is necessitated by the peculiarities of the building site. It also has the effect of humanizing what would be yet another dark glass box. -- Glass, Steel and Stone

Source: Carol M. Highsmith aia.org

Sofitel Chicago Water Tower, Chicago, Illinois, USA, 2002 designed by Jean-Paul Viguier S.A. d'Architecture

Its triangular footprint allows for a knife-like edge that protrudes 10 metres at the top, out over Chestnut St. This serves as a counterpoint to the John Hancock building, a few blocks away, which tapers inward from its base. Composed entirely in glass, the façade's irregular placement of windows creates a dynamic effect, with reflections shimmering across both the opaque and transparent surfaces.  -- MIMOA

Source: Peter de Ruig

Flat-Iron Housing, Den Haag, the Netherlands, 2007 designed by AAARCHITECTEN

On this incredibly small plot - just 30 by 35 metres - a 130 metre-high residential tower block, the highest in The Hague is built.  -- MIMOA