181 Fremont rises 800 feet above the San Francisco skyline, making it the third tallest building in San Francisco. The high-rise begins with five levels of underground parking, then five stories of lobby and retail, followed by 33 stories of Class A office space, one floor of amenities space, and 16 floors of exclusive condo residences. And while the architecturally breathtaking structure will be known for its dramatic aesthetic, there are some less-visible facts about the building that are equally fascinating. To begin with, 181 is supported by 44 caissons drilled 262 ft., 20 ft. of which is below bedrock. They are among the deepest-drilled caissons in the City. The building also has an exoskeleton that acts as structural support and is complemented by other seismic elements that make it one of the safest high rises in the world; and its elevator can be used for fire evacuation—another first. It also was built directly next to and above an historic brick building with a preschool playground on its roof. Building at the highest level—literally—also means building at the safest level, so Level 10 designed and built a netting system that cantilevers over the playground roof, protecting the children below. With 181 Fremont, Level 10 has taken urban infill projects to stunning new heights.