Situated on a prominent waterfront site at the southern edge of the Korean peninsula, the Busan Lotte Town Tower will play a pivotal role in representing the city of Busan as the new gateway of East Asia. Standing at over 510 meters with 107 floors, the landmark tower incorporates 585,000 square meters (6.3 million square feet) of mixed-use program consisting of office, hotel, residential, retail and entertainment facilities, and underground parking. The tower is organized to maximize floor efficiency for each program while integrating a unique structural solution to minimize the effects of extreme wind. The tower's triangular shape and distinctive stacked massing are driven by the integration of a stacked multi-use programming on a very dense site coupled with a structural strategy to mitigate typhoon winds and limit motion perceptibility. Tower setbacks occur between major programmatic elements and are arranged in a reciprocal clock-wise fashion, animating the exterior facades while efficiently altering the lease span based on appropriateness for each program space. Structural steel belt trusses organized to mimic this dynamic reciprocal plan transfer each program stack to six mega-columns to successfully limit lateral uplift on the tower under extreme wind events. The concrete core wall and three sets of mega-columns are linked by structural steel outriggers to constitute the lateral resisting system and are arranged as contiguous vertical extrusions to simplify construction within this unique reciprocal plan. In turn, the outline of the building reveals these vertical edges throughout the height of the tower, creating the clean silhouette emphasizing its verticality.
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