1,600 people in 24 cities living 4 values for 1 goal:
To use design to help our clients succeed.

We create exceptional environments that meet our clients' most complex design challenges.

We inspire people through our work by expressing timeless cultural, organizational and personal values.

We connect people and place with ideas that come from many minds and imaginations.

We care about serving our clients, enriching lives, improving communities and protecting our natural environment through design.

We are a global architecture, design, engineering and planning firm.

60+ Years of Design + Innovation

A Deep Energy Retrofit for a Federal Office Building in Denver

Byron G. Rogers Federal Office Building and US Courthouse
Denver, Colorado, USA

The team transformed a 1964 federal building into a cost-effective model of energy efficiency and sustainability.

HOK was the design architect on the design-build team for the LEED Gold modernization of the 18-story Byron G. Rogers Federal Office Building in downtown Denver. The challenge was to design an affordable, highly energy-efficient retrofit of a large, historic existing building while creating a modern, flexible workplace for 11 federal agencies.

The project included complete design and construction for upgrades to the structural elements and all major building systems. The building upgrades were projected to reduce annual energy costs by 55 to 65 percent.

Building upgrades included the replacement of the mechanical, electrical, lighting, fire protection and plumbing systems, as well as replacement of all exterior windows, an increase to insulation in walls and a complete renovation of all tenant spaces and most public spaces. Highly efficient LED lighting, high-performance building/lighting controls and thermal storage tanks help conserve energy.

Windows in the adjacent federal courthouse were replaced with more energy-efficient products.

This high-performance sustainable building project continues GSA’s legacy of outstanding public architecture. The team included Mortenson Construction as design builder, Bennett Wagner & Grody Architects as architect of record, RMH Group for MEP engineering and Rocky Mountain Institute as high-performance building consultant.





620,000 sq. ft. / 57,600 sq. m.


Interior Design
Sustainable Consulting


Projected annual energy savings


Projected reduction in water use


1 August 2016
“From Retro to Retrofit: Byron G. Rogers Federal Building”
High Performance Buildings

31 March 2015
“GSA’s Byron G. Rogers Federal Building Project Helps Revitalize Downtown”
U.S. General Services Administration

1 February 2014
“Net Zero: There’s Nothing To It”
Electrical Contractor