315 Montgomery is located in the heart of San Francisco's financial district, with easy access to retail and residential centers, as well as public transportation.Building Facts: Completed in the early 20th Century, 16 Story Building , Annex building located at 555 California Street, and 225,000 Square Feet. The Center is located on the 8th and 9th floors. We have 85 offices with an average of 165 square feet per office. Three conference rooms are available as well as two copy rooms and a café where clients can enjoy networking, watching the news or just peruse the local papers. Category-5 cabling is wired to each office to provide high-speed Internet access as well as reliable telecommunication services.