1 De Haro

As the first cross-laminated timber (CLT) building in San Francisco and the first multi-story mass timber building of its type in California, 1 De Haro is a first-of-its-kind achievement in mass timber design and construction. Designed by Perkins&Will, the new ground-up urban infill building offers 133,000 square feet of stunning LEED v4 Gold certified office and production, distribution, and repair (PDR) space grounded in sustainability and an elevated occupant experience.

At a Glance

SKS Partners
San Francisco, CA
133,000 SF
Perkins&Will (Architect)Hathaway Dinwiddie (General Contractor)
LEED Core & Shell, v4 (Gold)
  • LEED CS Consulting
  • Energy Modeling
  • Commissioning

The Challenge

Stok was engaged by forward-thinking developer SKS Partners to lead the project’s LEED CS v4 Gold certification pursuit. Specifically, Stok:

  • Managed all aspects of the LEED certification process
  • Provided sustainability consulting, offering recommendations to improve the performance, sustainability, and health attributes of the project
  • Performed energy modeling for LEED to recommend energy efficiency measures and options for renewables
  • Provided enhanced commissioning to ensure proper functioning of the building’s mechanical, electrical, and plumbing systems
  • Supported the development of the project’s sustainability narrative for LEED certification and external communications
“Stok has always been an enthusiastic team member on our projects. We appreciate their efforts to help us reach our sustainability goals for 1 De Haro and for always being a steward of sustainability in the industry.”

By the Numbers

Sequestered in the building’s structural wood components
Of wood material used is FSC mix certified, including all CLT and glulam
Reduction in indoor water usage compared to the International Plumbing Code, saving roughly 440,000 gallons/year
Annual energy cost savings (29% less operational energy than a LEED minimally compliant building)
Of construction waste by weight diverted from the landfill

The Solution


From the outset, the project team committed to creating a mass timber building for the many benefits it offers, including significant embodied carbon reduction, quicker construction speed, and natural beauty and warmth. Due to its use of mass timber for the majority of the building’s structure, an estimated 1,806 metric tons of CO2 is sequestered in the building’s structural wood components and an additional 700 MTCO2 were avoided by opting for mass timber over traditional materials such as concrete and steel, resulting in an impressively small embodied carbon footprint. In doing so, the project team was able to design and build a structure in alignment with strategies such as the Architecture 2030 and SE 2050 Commitments in pursuit of achieving net zero emissions in the built environment.


The building is designed to use 29% less operational energy than a LEED minimally compliant building (ASHRAE 90.1-2010 baseline). The team used parametric energy modeling design studies that considered orientation and sun angle to determine the optimal depth and position of sun shading devices to maximize light and heat in the coldest months while shielding from the sun in the hottest months. A 55kW rooftop solar photovoltaic (PV) array will produce a portion of the building’s annual energy demand.


Occupant comfort and health were important considerations during both the design and construction process and largely supported by the specification of healthy and sustainable materials. The exposed wood surfaces required fewer additional finishes, and the project team prioritized materials whose manufacturers have produced transparency reports on their product’s material ingredients and environmental impacts. The mass timber also infuses visual warmth into the space and provides beauty and character. As a central biophilic design element, it satisfies the innate affinity humans have for connection with the natural world.

For its exceptional use of mass timber and sustainability achievements, 1 De Haro received AIA San Francisco’s 2022 Honor Award, WoodWorks’ 2022 Commercial Wood Design Award, and ENR California’s Excellence in Sustainability Northern California Award of Merit and Best Regional Office/Retail/Mixed-Use Project Award of Merit.

Photo Credit: David Wakely

Project Leadership

Kristen Hershowitz
WELL | LBC | Materials