by Mark Robins | 1 November 2019 12:00 am

The red-wrapped stairway plunges infinitely as if you were looking into parallel mirrors. The stairwell is a focal point of United Therapeutics’ downtown campus in Silver Spring, Md. It is the largest net zero commercial building in the United States, and the tall space serves as a heat sink.
Stairwell designer: EwingCole, Philadelphia, www.ewingcole.com[1]
Stairwell fabricator/installer: Shickel Corp., Bridgewater, Va., www.shickel.com[2]
Metal wall/perforated panel fabricator/installer: MillerClapperton, Austell, Ga., www.millerclapperton.com[3]
Stairwell walls: Trespa International B.V., Weert, the Netherlands, www.trespa.com[4]

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