Location: Miami, FL (Brickell)

Type: Luxury Multifamily

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​Stories: 47

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Units: 135

 

Delivered: Q4 2025

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Una Residences, located in the prestigious South Brickell neighborhood, stands as a 47-story testament to luxury and architectural fluidity. Designed by the renowned firm Adrian Smith + Gordon Gill Architecture, the tower's silhouette is inspired by the curves of a classic yacht, featuring a sweeping glass façade that reflects the glittering waters of Biscayne Bay. Developed by OKO Group and Cain International, this waterfront property offers 135 ultra-luxury residences with expansive views, private elevator entries, and resort-style amenities—including a private marina, multiple pools, and a state-of-the-art spa—setting a new standard for sophisticated living in Miami.

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Beneath this architectural marvel lies a significant engineering achievement: the deepest underground parking garage in Miami. To construct this three-level subterranean structure, which extends nearly 50 feet below sea level, the construction team utilized an advanced deep-soil mixing technique to create a massive, watertight "bathtub." This complex process involved drilling hundreds of interlocking pillars to stabilize the ground and seal out the surrounding groundwater—a critical necessity given the site's proximity to the bay. This 100,000-square-foot garage not only maximizes the tower's aesthetic by concealing parking underground but also represents a pioneering approach to maximizing space in Miami’s challenging coastal terrain.

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Role:  As Estimator via HJ Foundation, a Keller company, Santiago played a pivotal role in calculating the financial and logistical framework for what would become Miami's deepest subterranean structure. Tasked with pricing a project that required excavating nearly 50 feet below sea level—a depth previously thought unfeasible in Brickell’s porous limestone—he had to meticulously quantify the costs for a massive "watertight bathtub" foundation system. This involved estimating the specialized Deep Soil Mixing (DSM) technique, which required drilling over 800 interlocking pillars to create a cement-soil plug capable of withstanding immense hydrostatic pressure. His work was critical in defining the budget for the foundation package, ensuring that the complex interplay of high-torque drilling rigs, massive slurry injections, and strict dewatering protocols was accurately forecasted to mitigate the high risks associated with building underwater in a dense urban corridor and next to the bay.