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Seen as key to the revitalization of downtown Los Angeles by both the city's public and private sectors, Pershing Square became the focus of a major site analysis and reconstruction that addressed the park's physical and social problems. The square's design, which was subject to rigorous public process, was the product of a collaboration between Olin Partnership and Legorreta Arquitectos. Feedback from open forum question and answer sessions held after six public presentations helped inform the final design of the park.

A victim of the automobile age, this once verdant 19th century park was excavated in the 1950's to build a 3 level underground garage. The replacement "rooftop" park was "greened" with expansive lawns and trees in planters, but yet could not transcend the isolation created when all sides of the park were severed from city street life by the garage's access ramps. The design team reconnected the park to its neighborhood by redesigning the ramps, creating space for new perimeter sidewalks and new entries. Pershing Square's new entrances have become identifiable gateways, each with unique elements: a 125 foot campanile, a cafe, a transit station, and kiosks.

The design of the park's interior optimizes a 10-foot change in grade. Once a single open space, the park is now divided into two distinct squares differentiated by a grade change. The lower square contains a large basin fed by an aqueduct that mimics tidal fluctuation of the sea, filling and draining at regular intervals. Bosques of trees with benches surround the basin and provide shade. The upper square consists of an amphitheater and stage. When not being used for performances, the amphitheater is a lawn for lounging and sports; the stage, a place to congregate and people watch.