Cultural Center Glass Dome

The restoration of the world’s largest Louis Comfort Tiffany art glass dome located in Preston Bradley Hall in the Chicago Cultural Center, 78 E. Washington Street is complete. The project restored the dome to Tiffany’s original vision and allows it to be seen as it was in 1897, when the building opened as the first Chicago Public Library.

Approximately 38 feet in diameter, the Tiffany dome spans more than 1,000 square feet. It contains approximately 30,000 pieces of glass in 243 sections within an ornate cast iron frame. The body of the dome has a “fish scale” pattern. The center, called the oculus, shows the signs of the zodiac. The interior stained glass dome originally was protected by an exterior translucent glass dome, which allowed much-needed natural light into what was then the library’s general delivery room. The lower portion of the room is covered with white marble and glistening mosaics, also designed by Tiffany.

During this project, the concrete and copper exterior dome that had been added during the 1930s was removed, once again allowing natural light to shine through the glass. Now, natural light pours into the room, changing the subtle colors of the restored glass minute-by-minute, while all of the room’s decorative elements glow and harmonize. In addition to cleaning and repairing the art glass, the ornate cast iron framework of the dome was given a new application of its original finish. Delicate rosette lighting around the cornice of the dome also was refurbished.

In December 2007, each of the art glass panels was carefully removed and replaced with a lexan (polycarbonate) replica covered with a translucent wallpaper graphic of the art glass, since events continued in Preston Bradley Hall through March. The panels were taken to a glass restorer, where each was taken apart, painstakingly cleaned, and put back together with new leading. Approximately two percent of the pieces had to be replaced with new glass, which was carefully manufactured and selected to match the original glass.

In early January 2008, the concrete and copper exterior dome was removed. It was replaced with a new translucent exterior dome made of three layers of insulated/laminated glass one and one-quarter inches thick, with a white PVB interlayer to reduce UV light.

In April, Preston Bradley Hall was closed as work began to restore the ornate cast iron framework of the dome to its original finish, aluminum leaf coated with an amber-tinted glaze. The combination creates an aged patina similar to old gold leaf but more lustrous and iridescent.

As the last step, the restored art glass was reinstalled in late June, and the room reopened on July 1.

The cost of restoring the Tiffany dome was approximately $2.2 million. Funding was obtained from several sources: $1.829 million from the Central Loop TIF; $298,230 from a HUD Grant; $109,940 from a State of Illinois Museum Grant; $5,000 from AMEX/NTHP Partners in Preservation; and approximately $31,000 in private donations.

The City of Chicago Department of Cultural Affairs and the Department of General Services retained Holabird & Root as the architects for the project, with Wight & Co. as the general contractor. More than 60 artisans and consultants worked on the project, including Botti Studios, DesignLab Chicago, Historic Surfaces/Evergreen, Primera and RestoricLLC.