Mark IV Realty


The Carbide and Carbon Building, now the Hard Rock Hotel, is a thirty-eight-story steel-framed structure designed in the art deco style by architects Daniel and Hubert Burnham, sons of the great Chicago architect and urban planner Daniel Burnham. The building comprises a twenty-three-story base and a fifteen-story tower. It is clad with terra cotta and glazed brick materials that include classic art deco motifs. At 492 feet tall, the structure is one of Chicago's tallest terra cotta buildings.


WJE quickly discovered that extensive cracking and displacement of terra cotta and brick had been caused by corrosion of embedded steel support elements and by the accumulation of compressive stresses due to the facade's inability to accommodate expansion of the clay-based cladding materials. Once the sources of distress were identified and conditions thoroughly documented, WJE developed restoration methods that enabled the preservation of more than 90 percent of the building's original terra cotta units. Other WJE restoration and preservation efforts included:

Introduction of relief joints at every fourth floor to mitigate compressive stresses in the exterior masonry

Restoration of windows where possible and specifications for appropriate replacements where deterioration was excessive

Development of effective methods for cleaning the terra cotta

Construction period services