343 Sansome Street

• Four Seasons — Joan Brown
  Tile; roof garden; artwork and open space are accessible from 9-5.
  The tiled obelisk stands at the center of the 15th-floor roof terrace and was funded through San Francisco's 1% for Art program combined with the POPOS requirement.
• L'Octagon — Pol Bury
  Stainless steel, marble; Sacramento St. lobby; artwork and open space are accessible from 9-5.
  Belgian sculptor Pol Bury (April 26, 1922 - September 28, 2005) began his career as a painter associated with the Jeune Peinture Belge and CoBrA groups before becoming known for kinetic sculpture.

1. 1908

   An eight-storey steel-frame office building was completed to the design of Howard and Galloway, in the Neoclassical Revival style, with heavy rustication on the first two storeys, a plain brick shaft and an overhanging cornice. Its south and east fronts were retained inside the tower built around them.

   San Francisco Department of City Planning, 343 Sansome Street: [Draft] Environmental Impact Report, Case No. 85.79E, 1986.
2. 1929

   The building was remodelled throughout in the Modern style for the Crown Zellerbach Company, gaining five storeys and Art Deco terra-cotta and brick detailing, with setbacks on the upper floors. The architects were Sam Hyman and Abe Appleton, and this is the form retained inside the later tower.

   San Francisco Department of City Planning, 343 Sansome Street: [Draft] Environmental Impact Report, Case No. 85.79E, 1986.
3. 1930

   The building remodelled to designs by Hays, Rankin and Appleton.

   Architecture, Planning & Preservation Professionals: A Collection of Biographies, adopted 2021
4. 1931

   345 Sansome Street: a single-storey reinforced concrete building at the Sacramento Street corner, by an architect the record does not name, with an oversized entrance, corner piers, a ribbed front and an owl's-eyes ornamental motif. It was cleared for the tower.

   San Francisco Department of City Planning, 343 Sansome Street: [Draft] Environmental Impact Report, Case No. 85.79E, 1986.
5. Nov 1981

   Permit 8110031 $$$ $24,000

   Additions alterations or repairs.

6. 1984

   The Security Building stood here at 343 Sansome Street; it was among the rated buildings of the city's Downtown Plan inventory.

   San Francisco Department of City Planning, The Downtown Plan: Environmental Impact Report, Draft, 1984.
7. June 1, 1984

   A rehabilitation study of the existing building was prepared by the firm Robinson, Mills & Williams, Architects, in connection with the proposed tower project.

   San Francisco Department of City Planning, 343 Sansome Street: Initial Study, 1986.
8. Oct 1985

   Permit 8511793S $$$ $31,100,000

   Vertical & horizontal extension.

9. 1986

   The Crown Zellerbach building then on the site was rated Category I — a building considered significant on the basis of architectural merit — under the Downtown Plan.

   San Francisco Department of City Planning, 343 Sansome Street: Initial Study, 1986.
10. Jan 1990

    Permit 9001944 $$$ $1,500,000

    Const. of initial tenant improvements in 343 sansome street.

11. 1991

    Built.

12. Mar 2005

    Permit 200503177753 $$$ $225,000

    Oti-1 4th floor el me ls sp.

13. Apr 2007

    Permit 200704269790 $$$ $386,635

    Oti-1 1st/fl-el, me, ls, sp.

14. Jul 2007

    Permit 200707136734 $$$ $475,000

    2nd floor-remodel of existingoffice floor: (n0) offices, conference rooms, copy rm, pantry and lounge. newlighting, power/data for offices, conference rooms, copy, pantry and lounge. mechanical and demolition under separate permit.

15. Mar 2009

    Permit 200903254813 $$$ $200,000

    Renovation of existing vacant office space/suite to include creation of private office, breakroom kitchen and ancillary support areas. mechanical/electrical, life safety sep permit.

16. Jul 2013

    Permit 201307021020 $$$ $450,000

    7th floor t.i. on the existing full floor tenant, demolition of partitions, doors, millwork, finishes, electrical, plumbing & ocnst of new partitoins, doors electrical, finishes & plumbing. mechanical, electrical, life safety & sprinkler system modifications under separate permit.

17. May 2014

    Permit 201405196115 $$$ $770,792

    Tenant improvement on an existing full 8th floor tenant. demolition few partitions, doors, finishes, electrical. construct new partitions, doors, electrical, finishes and plumbing. (mechanical, life safety and sprinkler system modification are under seperate permit.) n/a ordinance #155-13.

18. Sep 2015

    Permit 201509237810 $$$ $250,000

    14th floor, suite 1400: ti- demolition and construction of conference rooms and offices. new millwork at pantry and new finishes throughout. construction of 2 showers and 1 staircase. new ceiling and lighting.project is pursing leed gold. mep/fire/life safety under sep permit.maher na.

19. Jan 2016

    Permit 201601207414 $$$ $450,000

    Ste 125, change of use from office to fitness training. ti of existing space on 1st floor to include new partitions, lighting, re-assignment of existing electrical, counter, upgrade front entry and ada restrooms & shower. maher na.

20. Feb 2016

    Permit 201602119388 $$$ $1,189,972

    Interior ti demolition of non-load bearing partitions, ceiling grids, lighting and finishes, new partitions, ceilings, light fixtures, casework, doors and finishes. mep under separate permit. maher na.

21. Feb 2016

    Permit 201602250501 $$$ $475,000

    Meps for previously approved t.i. reference app#201602119388.

22. May 2016

    Permit 201605167491 $$$ $1,500,000

    Tenant improvment to existing levels 6 & 10th floors. spaces including new non load bearing partitions, suspended ceiling, floor finshes, restroom expansion, break room and storage.

23. May 2016

    Permit 201605187789 $$$ $370,000

    Interior ti: demolition of existing non load bearing partitions, ceiling grids, lighting and finishes. new construction includes interior partitions, ceilings, light fixtures, casework and installation of doors, compliance with 155-13 not required.

24. Jun 2017

    Permit 201706280599 $$$ $600,000

    5th fl, ste 500: demolition of non structural elements including interior partitions, doors, finishes, ceilings. new conferences, offices, phone rooms. mep, ls, sprinkler modification sep permit.

25. May 2019

    Permit 201905241605 $$$ $611,000

    10th floor - interior ti, new partition, lights, doors and finishes, ceilings. maher na.

26. Oct 2019

    Permit 201910023276 $$$ $950,000

    11th floor: office remodel of new conference rooms, huddle rooms, focus rooms, & break room, new furniture & finishes, upgrade all fixtures to new led lighting hvac upgrade for new remodel.

27. Aug 2022

    Permit 202208251220 $$$ $508,496

    Exterior: reconstruction & repairs of the southwest corner of the brick masonary on the facade. floors 3-5 of the corner are to be reinforced to prevent masonry cracking.floors 6-8 completel removed and replaced with new brick masonary & mortar.new steel shelf angles will be welded in place on 6-8/f.

28. 2024

    A plaque depicting William Leidesdorff, the Afro-Caribbean merchant and city official of the Mexican and early American era, is mounted on the wall here.

    African American Citywide Historic Context Statement, adopted 2024
29. Apr 2024

    Permit 202404250730 $$$ $1,012,487

    Office ti 9th floor to include soft demolition existing space to include non structural partitions, doors, ceilings, lighting millwork, fixtures and finishes. add new non structural partitions, doors, window glazing, ceieling, lighting millwork, fixtures and finishes. update bathrooms, elevator.

30. Oct 2024

    Permit 202410173178 $$$ $478,000

    15th floor: expand existing suite to adjacent suite. demolition of expansion suite includes non-structural partitions, doors, glazing, lighting fixture, millwork, and finishes. new construction includees new non structural partitions, doors, glazing, light fixtures millwork and finishes. mep deferre.

31. Dec 2024

    Permit 202412126752 $$$ $430,000

    16th floor: tenant improvement interior renovation to include non-structural partitions, new ceilings, and new finishes thoughout area of work. mep deferred.

32. Apr 2025

    Permit 202504305512 $$$ $650,000

    5th fl suite 500: demolition of existing non structural partitions, ceilings, doors, glazing millwork construction of new non structural partitions, ceilings, doors glazing. mep under separate permit.

33. Dec 2025

    Issued Permit 202512151745 $$$ $840,000

    #950: new t.i. on 9th floor: includes demolition of existing office space: non structural partitions, doors, glazing, ceiling, lighting, millwork and finishes. mechanical, electrical, & plumbing submittals to be deferred.

DBI holds 473 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 473. 2 of them are nominal $1 street-space or sidewalk permits. 1 expired permit is not shown. A citywide context statement dates a building at this address by Hays, Rankin and Appleton to 1930; the assessor's roll dates the structure on this parcel to 1991. Whether the building described still stands here is unsettled. The statement dates the addition 1992 in one figure caption and 1991 in another.