Comcast Center

Mixing modernism with minimalism on the tallest building in Pennsylvania, Robert A.M. Stern Architects have placed their mark on the Philly skyline with another vertical eye-climb. The 975´ tall Comcast Center features a subtle geometric design of large glass planes interrupted by terraces and notches in a fully glazed, highly transparent facade that floods interior spaces with diffused natural light.

Comcast Center was awarded LEED Gold certification by the United States Green Building Council, making it the tallest LEED certified building in the United States at the time of completion. The building structure incorporates 15´ to 17´ floor heights that rely on natural lighting, resulting in 13 percent less energy usage than conventional buildings. High performance low-e coatings throughout the facade protect the building from temperature extremes.

A 120´ tall public winter garden clad entirely by glass sits at the base of the tower. This advanced facade design features a double skin cavity wall with an integrated and automated sunscreen system to regulate daily and seasonal solar and temperature variations while also continuing the structure’s theme of maximized daylighting. This winter garden, in addition to a trio of three-story atria, building corners and crown of the tower, are all clad by ultra-clear, low-E, low-iron glass. A lightly tinted and reflective glass is used throughout the tower’s remaining facade.

Enclos provided complete design/build services for all facade elements while working closely with the architect throughout the design phase. The project’s over-sized curtainwall units were fabricated and assembled offsite, then shipped in a carefully coordinated sequence to support the firm’s installation crews. Enclos site operations personnel worked closely with the general contractor to develop an optimum erection strategy for the project’s challenging dense urban surroundings.



Facade Area:

698,000 sq ft


Philadelphia, PA


headquarters, office


975 ft



General Contractor:

L.F. Driscoll


Robert A.M. Stern Architects


Thornton Tomasetti

Facade Consultant:

Curtainwall Design Consulting


Award of Excellence - 10 Year Award
Council on Tall Buildings and Urban Habitat, 2018

Award for Excellence
Urban Land Institute, 2009

Excellence Award
General Building Contractors Association, 2008

National Award, Best of the Best-Office
McGraw Hill, 2008

Overall Project of the Year
Mid-Atlantic Construction, 2008

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