From the BPL Compass:
Since the 1940s, the library has used a number of buildings to serve as storage facilities, but now we are entering the final phase of a long term project to consolidate our offsite storage space in the City of Boston Archival Center, located at 201 Rivermoor Street in West Roxbury. When completed, much of the library’s special research collection will be stored in a secure climate controlled state-of-the-art facility that will enhance the efficient storage and retrieval of books, journals, newspapers, maps, films, and archival materials. The facility is based on a high-density shelving plan and is designed around the “Harvard model” in which materials are shelved according to size.
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See Also: City of Boston Archival Center Info