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Pedestrians walk along the South Bank opposite skyscrapers including left to right, 20 Fenchurch Street, also known as the 'Walkie-Talkie,' Tower 42, the Leadenhall building, also known as the 'Cheesegrater,' the Heron Tower, and 30 St Mary Axe, also known as the 'Gherkin,' as they stand beyond the north bank of the River Thames in London, U.K., on Tuesday, Feb. 17, 2015. The FTSE 100 Index added 7.53 points, or 0.1 percent, to 6,905.66 at 9:47 a.m. in London, leaving the gauge about 25 points away from the all-time high reached in December 1999. Photographer: Simon Dawson/Bloomberg via Getty Images

Pedestrians walk along the South Bank opposite skyscrapers including left to right, 20 Fenchurch Street, also known as the 'Walkie-Talkie,' Tower 42, the Leadenhall building, also known as the 'Cheesegrater,' the Heron Tower, and 30 St Mary Axe, also known as the 'Gherkin,' as they stand beyond the north bank of the River Thames in London, U.K., on Tuesday, Feb. 17, 2015. The FTSE 100 Index added 7.53 points, or 0.1 percent, to 6,905.66 at 9:47 a.m. in London, leaving the gauge about 25 points away from the all-time high reached in December 1999. Photographer: Simon Dawson/Bloomberg via Getty Images