601–611 Folsom Street

1. Apr 1990

   Withdrawn Permit 9007584 $$$ $1,800

   Drywall ceiling & reinstall surface mounted lights.

2. Aug 1996

   Permit 9615089 $$$ $300,000

   Hvac project--install exhaust system, reinforcing wall open'g.

3. Mar 2000

   Permit 9923127 $$$ $375,000

   Battery room, and closing of battery rm @ 2nd floor.

4. Feb 2001

   Permit 200102071531 $$$ $159,000

   Install hvac, chilled water piping & new power feeds (1st floor).

5. Feb 2004

   Permit 200402196744 $$$ $275,000

   Replacement of chillers located in basement/rplmnt of 2 chilled water pumps.

6. Oct 2005

   Permit 200510266577 $$$ $368,175

   Retro fitting existing building with new fire protection systems. basement to roof with new class ii stand pipe for hose stations. sprinkler per highrise ordinace phase ii-phase i separate permit.

7. Nov 2007

   Permit 200711057341 $$$ $500,000

   Repair/replace existing insulation in vertical air supply plenum on all floors of building/ encapsulate insulation with 22gauge sheet metal from basement to 9th floor, install new code compliant access doors for duct work on all floors.

8. Oct 2009

   Permit 200910018107 $$$ $182,125

   Replacement of a supply fan, sq ft-6, to the ninth. floor air handler.

9. Jan 2013

   Permit 201301258761 $$$ $750,000

   Install new roof top air handler and duct work.

10. Jan 2016

    Permit 201601257847 $$$ $200,000

    2nd floor: at&t- install 2 in-row cooling units one is redundant; maher n/a separate permit deferred for 4" sprinkler pipe relocation.

11. Apr 2018

    Permit 201804277611 $$$ $500,000

    9th floor: install a pair of crac units and replace a chiller in the basement. n/a for maher.

12. Dec 2018

    Permit 201812178497 $$$ $200,000

    Install 2 new computer room air handlers on the 3rd fl.

13. Aug 2021

    Issued Permit 202108136420 $$$ $250,000

    Replace 1 water cooled ac unit on the 6th floor with 2 new chilled water ac units on 6th floor. remove 2 existing closed circuit cooling towers on the roof. remove all condenser water piping, supports, and electrical feeders on the roof for the removed cooling towers. we are not moving any existing walls.

14. Feb 2023

    Permit 202302141935 $$$ $500,000

    Install mechanical and electrical infrastructure to support telephone equipment.

15. Mar 2023

    Permit 202303203971 $$$ $1,253,814

    Reroofing.

16. Aug 2024

    Issued Permit 202407196873 $$$ $845,000

    Secure vertically oriented/long alumium panels across all elevations of the building. this is a preventive measure. a full facade study is also planned in august 2024 to observe and meet with city's facade inspection requirement.

DBI holds 150 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 150. 4 of them are nominal $1 street-space or sidewalk permits. 9 expired permits are not shown.

The building is one of AT&T's principal telephone-switching sites in San Francisco. In 2006 a former technician disclosed that Room 641A held equipment splitting AT&T's fibre-optic backbone traffic to the National Security Agency.