|Boston Public Library Courtyard|
A new addition to the Boston Public Library was opened in December 1971. Philip Johnson observed two specific requests in his design of the new building - to mind the existing roofline, and to use complimentary material to the exterior of the McKim Building. the McKim and Johnson Buildings are connected on three of the Johnson Building's ten levels to provide access to the resources and public services of the library. Unique structural and mechanical systems were developed in order to contain nine floors and a mezzanine level within the high limitations of the neighboring McKim Building.