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Company iMIS IdImage Count
California ISO HeadquartersFolsom, CA234955
Proj Overview

Project Overview

Headquarters for a California high voltage electric grid operator, this LEED Platinum building consists of three wings designed to meet three distinct functional requirements. Each wing serves as a different function: a facility for state-of-the-art grid operations and data, offices for 500 employees, and meeting and training spaces. The office wing lent itself to a regular form, with uniform bay spacing that benefited from the hybrid moment frame. This approach achieved the aesthetic goals while providing an economical system.

Precast Solution

Precast insulated wall panels were selected for the mission-critical operations and data center wing because they could be fabricated off-site while site work was underway and facilitated close-in before winter. The office areas had uniform bay spacing and a precast hybrid moment frame system was selected for cost, seismic, and aesthetic reasons. The precast columns and beams with hollow core planks were left exposed and provided a loft-like quality to the space. The system also allowed large exterior openings for extensive day lighting. The building is equipped with raised access floors and an under-floor HVAC system. Insulated wall panels cut energy use and the mass of the floor system serves as a heat sink.

 

Awards
2011 Design AwardsBest Office Building: Low-Rise
Project Team

Architect

Dreyfus Blackford Architects, Sacramento, CA 

Engineer

Buehler & Buehler Structural Engineers, Sacramento, CA 

Contractor

Clark Design Build of California, Oakland, CA 

Owner

California ISO, Folsom, CA 

Precaster and Precast Specialty Engineer

Midstate Precast LP, Corcoran, CA 

Key Project Attributes

  • Precast concrete columns and beams used with hollow-core slabs to create a loft-like quality
  • Precast concrete flooring serves as a heat sink 
  • Precast permitted extensive exterior openings that maximized day lighting

Project/Precast Scope

  • Project Size: 278,000 ft2 (25,800 m2)
  • Project Cost: $113 million
  • LEED platinum certified
  • 5 precast concrete hybrid moment-resisting frames and a total of 1360 precast concrete components were used
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