Historical San Francisco building connected to new luxury high-rise

Built in 1903 at the corner of Third and Mission streets in what is now San Francisco’s South of Market neighborhood, the 10-story Aronson Building has certainly earned its longevity: It survived the devastating April 18, 1906, San Francisco earthquake and subsequent fires, which destroyed 500 city blocks, killed an estimated 3,000 people, and left half the city’s population of 400,000 without homes.

The Aronson survived largely because of its construction with a flat slab system that is known as the Roebling System B. This system consists of fire-resistant concrete slab floors supported by steel columns. For fireproofing, the interior

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