Architecture: Mullen Library is a purpose-built facility for storage and use of a comprehensive document collection; it is in its original use. The elegance of the design is enhanced by its simplicity of form, clearly expressed function and skillful detailing. It is a large building articulated by the main front detail and blended with a change in scale and utility for the stack areas to the rear. This is done with architectural and material harmony — important because the building is highly visible from all sides. Murphy & Olmsted used the Italianate Revival style with elegant restraint typical of the early 20th century. The design was much praised at the time. Mullen Library to Keane Hall and Shahan Hall acts as a terminus to a symmetrical plan, axially focused on the National Shrine to the west.

History: The library was built as a main campus facility for a growing university between 1925 and 1928, not only consolidating various collections but becoming the archive of several distinguished collections of books and papers. It has maintained its original use, with additional capacity added in harmony with original architecture in 1958.

Significance: Mullen Library is a purpose-built structure meant to be a focal point of The Catholic University of America. Architecturally excellent, formally related to its site, and containing important collections, it continues to play its intended role. This role contributes to the unique qualities of religion, culture and education of the university. Added significance comes from this excellent example of the architecture of Murphy & Olmsted as well as the craftsmanship of Joseph Earley. The library is a contributing structure on the campus.

Condition: As the original structure housing the resources for sustaining the university’s research and teaching mission, the facility has required a series of capital repairs. Corrective work has been performed in phases as funding was acquired. In the past 12 years, the work completed has included new windows, limited building repainting, new accessibility ramps and doors, the installation of air-conditioning and humidification systems in select areas, and a complete building entrance renovation recently completed. The building still needs extensive work on the roofing and drainage systems, elevators and mechanical and electrical systems. A $6 million renovation of the first floor, including technology upgrades and furnishings, was completed in March 2004 and provides a welcoming space for visitors.