Take a look at Seventh Avenue South. Unlike most avenues in New York, this one was not part of the original design for the city. Until the nineteen-tens, this avenue simply did not exist below Greenwich Avenue. In 1914, city planners wanted to extend the IRT subway line and connect the new Pennsylvania Station to Lower Manhattan. To do this, they performed a massive urban surgery, slicing diagonally through 11 residential blocks and demolishing nearly 300 buildings. This project, known locally as "The Cut," is why you see so many strangely shaped, triangular buildings along this street. For a practical tip, look at the narrow, one-story commercial buildings directly on the avenue; many are actually the rear sections of much taller apartments that were literally sliced in half a century ago. It is a rare architectural scar that tells the story of progress clashing with historical preservation.