The Cleveland Medical Library Association carefully planned and built the Allen Memorial Medical Library building to house their library collections and their growing historical collections--now part of the Dittrick Medical History Center and Museum.They chose the architectural firm of Frank R. Walker and Harry E. Weeks, a firm noted in the Midwest for their classical revival style. Walker and Weeks left the largest legacy of important structures in Cleveland of any architectural firm in the city's history, including the Federal Reserve Bank, The Cleveland Public Library, and Severance Hall. The construction firm of Reaugh was retained, and the cornerstone was laid on July 23, 1925.

The building is considered an architectural prize, resembling the Petit Trianon at Versailles on a larger scale. It is neo-classic in style. From its pink marble exterior steps and bronze doors, to its marble lobby and interior stairs, and reading rooms done in an English university tradition, it is a visual pleasure. The architectural significance of the Allen is noted in its designation as both a Cleveland Landmark and as part of the National Register of Historic Places.

41.50597° N, 81.60844° W The building code for Allen Memorial Library is ALLN. The street address for Allen Memorial Library is 11000 Euclid Avenue.