• Location: Des Moines, Iowa

The Polk County Historic Courthouse underwent significant restoration to brilliantly display its original glory. The $2.5 million renovation of the historic courthouse involved cleaning, repairing, and sealing the building’s limestone. In addition to the exterior makeover, Alvine Engineering was tasked to design new exterior lighting for the façade of the downtown historical landmark. Early in the design process, Alvine leveraged our close relationship with the University of Nebraska Architectural Engineering School to provide a few graduate students an opportunity to assist the team with a luminance study of the downtown area. The result was a win for the project, the University, and Downtown Des Moines.

Project highlights:

  • 93 LED luminaires were installed that utilized ground-mounted flood lights, building-mounted flood lights, and in-grade mounted luminaires.
  • The design proved to be 61% better than the local energy code baseline and uses 43% less energy than an equivalent metal halide system.
  • High-efficiency light-emitting diode spotlights were installed on the roof and on the ground to illuminate the historic landmark.