1 De Haro

A New Dawn for Mass Timber: San Francisco gets its first CLT project

Our concerns were really about trying to fit into the neighborhood and give back to the neighborhood, and figure out how to take what was a material supply yard and take it into the next century"

1 De Haro is the first CLT commercial office project not only in San Francisco, but in the entire state of California. Featuring a mixed construction method, 1 De Haro maximizes the roof area, the wood floor office levels, and the two-story, concrete ground floor which accommodates space for light manufacturing and a mezzanine level.

Since the mass timber building is lighter than a concrete or steel building of similar size, the project team was able to reduce the cost of the foundation and utilize fewer deep piles for anchoring the building.

Location Pin Icon
San Francisco, California
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Square Feet:
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Commercial, Mass Timber, Sustainable Design
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Primary Material:
Concrete, Wood

Project Highlights

  • Features approximately 100,000-sf of CLT, glulam beams and columns and a timber concrete composite floor.
  • The use of mass timber equates to roughly 2,000 metric tons of stored carbon.
  • The wooden core is wrapped with a glass curtain wall. The result was an aesthetically pleasing “jewelry box” building design situated in a triangular shaped site.
  • The structure utilizes some of the longest single span cantilever floor plates in North America by adopting a timber concrete composite floor assembly with spans up to 25 feet.
  • DCI helped the client reach sustainability standards by performing a retroactive Life-Cycle Analysis (LCA).
1 De Haro Wakely OK Final 24

Project Challenges

With Mission Creek running through the site in an underground culvert, the area of the building was limited to a triangular shape. In addition, the site contains soft soils and required a deep pile foundation system. This concrete structure created significant weight and was penciling out to be an expensive foundation system.

Structural Solutions

In order to reduce the weight of the structure for the soft soils, the design team explored the option of mass timber. They took the design through concrete and mass timber simultaneously and priced them against one another. In addition to cost decisions, the design team wanted to provide a structure that provided environmental benefits – both for the end user and for the construction process. With exposed mass timber, tenants may feel a closer connection to nature – also known as biophilia.

Video by Prism Media

Awards & Certifications

  • ENR California Best Projects 2022 Excellence in Sustainability – Northern California, Award of Merit
  • ENR California Best Projects 2022 Office/Retail/Mixed-Use – Northern California, Award of Merit
  • Targeting LEED Gold
  • 2022 WoodWorks, Commercial Wood Design
  • 2022 AIA San Francisco, Architectural Honor Award


Jeff Brink SF website1

Jeff D. Brink

Jordan Hague SF web

Jordan Hague

Sumandeep Singh SF website2

Sumandeep Singh

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