This building, originally housing the Sunset exchange was built in the latter half of 1909 as part of an expansion program which saw new exchanges built in Georgetown and Beacon Hill. P.T. & T.'s in-house architect Edwin V. Cobry was responsible for the designs. To meet the needs of a population boom in the early 1940s, this building was replaced by the current exchange, now owned by Qwest Communications, in 1942.