Pacific Telephone & Telegraph switching station

1. 1936

   The Pacific Telephone & Telegraph Co. telephone exchange, built in 1936 and enlarged in 1947 — a privately funded building in the PWA Moderne style, which was otherwise used mostly for public work.

   San Francisco New Deal Historic Context Statement, adopted 2023
2. 1937

   Built as the Pacific Telephone and Telegraph Company's switching substation.

   Market & Octavia Historic Context Statement, adopted 2007
3. 1953

   Listed in the city directory as Pacific Telephone and Telegraph Co.

   Market & Octavia Historic Context Statement, adopted 2007
4. Sep 1995

   Permit 9514424 $$$ $97,285

   Reroofing.

5. Mar 2001

   Permit 200103265279 $$$ $450,000

   New air handler, includes structural hvac support (14 sheets).

6. Mar 2001

   Permit 200103265277 $$$ $200,000

   3rd & 4th floor ductwork.

7. Mar 2001

   Permit 200103265273 $$$ $150,000

   Basement, first & 2nd floor ductwork.

8. Feb 2002

   Permit 200202209539 $$$ $25,000

   3 duct smoke detectors at roof connect to dgp4c on 4th fl. utilize 2 e hoa switches @ ex 1st floor fac.

9. Apr 2004

   Permit 200404272306 $$$ $13,500

   Removal of exhaust stacks and generator.

10. Jul 2004

    Permit 200407199127 $$$ $350,000

    New standby generator, remote radiator, exhaust stack (replace) concrete pads(2).

11. Jun 2008

    Permit 200806053692 $$$ $20,000

    Modify existing t-mobile wireless telecommunications facility. replace 1 equipment cabinet at roof top. replace 3 existing antennas and add 2 additional antennas.

12. Oct 2010

    Permit 201010072473 $$$ $450,000

    Replace air handler and duct work, including demolish existing unit and install new; modify ductwork to redistribute air in basement, electrical and piping modifications to install new air handler.

13. Nov 2011

    Permit 201111148776 $$$ $300,000

    Install new chiller at rooftop. install structural framing to support new chiller cac.

14. Mar 2017

    Permit 201703091089 $$$ $20,000

    Replace 3existing panel antennas with 3 new air 32 db antenns on existing mounts. add 3 8' panel antennas on new masts/install mounts. replace 6 existing tma's with 8 new tma. install 3 new rrus near equip. relocate 12 existing coax cables from sleepers into cable trays. maher na.

15. Sep 2020

    Permit 202009144111 $$$ $25,000

    Rooftop only: proposed mod to e tmobile telecom facility to consist of remove 3 d rfs quad antennas 3 n rfs octo and 3 n air 6449 b41 antennas-remove and replace 6 raduis remove 3 e tmas remove 3 radios install 2 n cabinets and supporting work per plan.

16. Feb 2022

    Permit 202202188342 $$$ $250,000

    Replace two existing air coole chillers on the roof of the building. mechanical & electrical work to support the replacement.

DBI holds 40 permits for this parcel, most of them tenant improvements on individual floors. The timeline shows the 24 largest by stated cost, plus the earliest on file; the DBI query in the sources below returns all 40. 11 expired or cancelled permits are not shown.