About the Building

520 West 20th Street sits directly along the High Line and captures the essence of Chelsea by combining preserved industrial architecture with a distinctly modern addition. The original warehouse structure remains largely intact, with its brick façade left untouched, allowing the building to retain the raw, authentic character that defines the neighborhood. Inside, that same approach continues, where exposed concrete, aged brick, and timber elements reinforce a sense of history while creating a warm, textured office environment.

Rather than separating old from new, the design weaves them together. The materials used in the original structure carry through into the updated portions of the building, creating a consistent visual language across both the historic base and the contemporary expansion above. Rising from the existing structure, two vertical cores anchor the building’s transformation. These cores contain circulation and mechanical systems, while also serving as the structural backbone for the steel-and-glass addition that extends over the original roofline.

The warehouse itself, which had previously been used as a parking facility, was intentionally left in its found condition. Weathered brick, discoloration, and remnants of old signage were preserved, reinforcing the authenticity of the structure rather than erasing it. Inside, the original ceiling heights remain generous, enhancing the sense of volume and allowing the historic materials to define the space.

At the ground level, the lobby introduces a more refined but still contextual design. Board-formed concrete surfaces, a custom reception installation, and a feature wall constructed from reclaimed railroad ties—referencing the nearby High Line—create a space that feels both industrial and curated. The inclusion of gallery space further aligns the building with Chelsea’s art-driven identity.

Structurally, the new addition is supported by the two vertical cores, which rise through the building and extend above the original roof. These elements, inspired by the building’s former elevator shafts, now function as the framework that carries the modern glass volume. The result is a composition where a contemporary structure appears to hover above a preserved industrial base.

Overall, the building does not attempt to overshadow its surroundings. Instead, it embraces Chelsea’s transformation by maintaining a clear connection to its past while introducing a modern architectural layer. The preserved warehouse grounds the property in the neighborhood’s industrial history, while the elevated glass addition reflects the forward-looking character of the area today.