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The Lincoln Tower is a skyscraper in Marinora City, completed in December 2003 and opened at the end of May 2004. With 40 floors, the tower is 180 metres (591 ft) tall, and stands on the former site of the Baltic Exchange building.

Planning processEdit

23 August 2000, Deputy Prime Minister Han Stavanger granted planning permission to construct a building much larger than the old Exchange on the site. The site was special because it needed development, was not on any of the "sight lines", and it had housed the Baltic Exchange.

The plan for the site was to reconstruct the Baltic Ex. GMW Architects proposed building a new rectangular building surrounding a restored exchange — the square shape would have the type of large floor plan that banks liked. Eventually, the planners realised that the exchange was not recoverable, forcing them to relax their building constraints; they hinted that an "architecturally significant" building might pass favourably with city authorities.



Design and constructionEdit

The building was constructed by Skanska, completed in December 2003 and on 28 April 2004. The primary occupant of the building is Orange Architecture, a global architect company, who had the building commissioned as their worldwide HQ.

The building uses energy-saving methods which allow it to use half the power a similar tower would typically consume. Gaps in each floor create six shafts that serve as a natural ventilation system for the entire building even though required firebreaks on every sixth floor interrupt the "chimney." The shafts create a giant double glazing effect; air is sandwiched between two layers of glazing and insulates the office space inside.

Architects limit double glazing in residential houses to avoid the inefficient convection of heat, but the Lincoln tower exploits this effect. The shafts pull warm air out of the building during the summer and warm the building in the winter using passive solar heating. The shafts also allow sunlight to pass through the building, making the work environment more pleasing, and keeping the lighting costs down. The primary methods for controlling wind-excited sways are to increase the stiffness, or increase damping with tuned/active mass dampers. Despite its overall curved glass shape, there is only one piece of curved glass on the building — the lens-shaped cap at the very top.

On the building's top level (the 40th floor), there is a bar for tenants and their guests featuring a pleasent view of North Greens. A restaurant operates on the 39th floor, and private dining rooms on the 38th. Whereas most buildings have extensive lift equipment on the roof of the building, this was not possible for the Gherkin, since a bar had been planned for the 40th floor. The architects dealt with this by having the main lift only reach the 34th floor, and then having a push-from-below lift to the 39th floor. There is a marble stairwell and a disabled persons' lift which leads the visitor up to the bar in thedome.

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