More than two-thirds of inner Boston's modern land area did not exist when the city was founded, but was created via the gradual filling in of the surrounding tidal areas over the centuries, notably with earth from the leveling or lowering of Boston's three original hills (the "Trimountain", after which Tremont Street is named), and with gravel brought by train from Needham to fill the Back Bay. Downtown and its immediate surroundings consists largely of low-rise (often Federal style and Greek Revival) masonry buildings, interspersed with modern highrises, notably in the Financial District, Government Center, and South Boston. Back Bay includes many prominent landmarks, such as the Boston Public Library, Christian Science Center, Copley Square, Newbury Street, and New England's two tallest buildings—the John Hancock Tower and the Prudential Center. Near the John Hancock Tower is the old John Hancock Building with its prominent illuminated beacon, the color of which forecasts the weather. Smaller commercial areas are interspersed among areas of single-family homes and wooden/brick multi-family row houses. The South End Historic District is the largest surviving contiguous Victorian-era neighborhood in the US. The geography of downtown and South Boston was particularly impacted by the Central Artery/Tunnel Project (known unofficially as the "Big Dig"), which allowed for the removal of the unsightly elevated Central Artery and the incorporation of new green spaces and open areas.

How much of Inner Bostons land area did not exist when the city was founded?