On the morning of September 11, 2001, two hijacked commercial jetliners struck the Twin Towers in Lower Manhattan, a third plane struck the Pentagon, and a fourth crashed in rural Pennsylvania. A total of 2.977 people were killed in the terrorist attacks. In the face of this unprecedented loss, the city of New York promised to rebuild Lower Manhattan as a lively neighborhood while honoring and maintaining the memory of this day. Thus began one of the largest reconstruction projects in New York City, a process that is still ongoing now, 23 years after the tragedy.

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Sloped terrain offers a tantalizing prospect for developers. With breathtaking views over either natural or urban landscapes, often without the realistic possibility of being overlooked by future development, a parcel of land on a slope provides a high reward. However, whether it’s the extra excavation involved to cut and fill or cantilever out on a flat surface, the complications of water drainage, or the loss of light and difficulty of access at the front of the property, building on sloped terrains is not without its difficulties.

But it’s not necessarily the angle of the site that’s most at fault, it’s the shape of the building. By splitting up a multi-story structure and repositioning – possibly even disconnecting – each level, projects designed to comply with the existing topography by applying multiple ground levels can reduce the amount of excavation required. The split floor plan can also help to improve access and natural light and increase both interior and exterior space.

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