343 SANSOME ST
Commercial Office · San Francisco
At a glance
343 SANSOME ST in San Francisco, CA is listed on the San Francisco property roll as “Commercial Office”, block/lot 0239030. The roll records 15 floors, a 1991 build year and an assessed value of $125,166,876. 17 active business locations at this address appear in public records.
Derived from suite and floor strings in the occupancy records
Which floors show activity
Floors 2-4 show no business on record — 3 unbroken floors, the longest such stretch here. Also quiet: 13-15, 10-11. That is where the public record shows nobody, in blocks — a place to start asking, not a listing.
- 15no record
- 14no record
- 13no record
- 121 on record
- 11no record
- 10no record
- 91 on record
- 8no record
- 71 on record
- 6no record
- 54 on record
- 4no record
- 3no record
- 2no record
- 15 on record
Floors are read from suite numbers on San Francisco business records (suite 4900 → floor 49). A floor with no record is not necessarily vacant — it may be mechanical, occupied by the owner, or let to a business whose receipt carries no suite. Receipts also lag reality by months. This shows where the public record places businesses, not a rent roll or an availability report. A stretch of quiet floors is not contiguous space for rent — it is contiguous silence in the record, which is the closest thing the public record has to that question and worth exactly what it costs to check.
The building's own benchmarking filing
Energy performance
From the building's own filing under its city's benchmarking ordinance. An ENERGY STAR score of 75 or above means the building outperforms three quarters of comparable buildings nationally. It is a self-reported figure, verified by the city only to the extent the ordinance requires.
Public record — 17 matched business locations
Tenants & business locations
| Company | Suite / floor | Since | Source | Match |
|---|---|---|---|---|
| Skyline Construction Enterprises, Inc. | STE 500 | Aug 2025 | SF registered business | address · medium |
| Gursey Schneider Llp | STE 900 | Sep 2024 | SF registered business | address · medium |
| Sansome Holdings, LLC | STE 175 | Feb 2023 | SF registered business | address · medium |
| Wealthspire Advisors, LLC | STE 540 | Jan 2022 | SF registered business | address · medium |
| 343 Sansome Street | — | Jan 2019 | SF registered business | address · medium |
| Orangetheory Fitness Financial District | STE 125 | Sep 2017 | SF registered business | address · medium |
| Medidata Solutions Inc | — | Jan 2016 | SF registered business | address · medium |
| 343 Sansome Lot | — | Oct 2014 | SF registered business | address · medium |
| Cbre Inc | STE 175 | Dec 2013 | SF registered business | address · medium |
| Jim Joseph Foundation | STE 550 | Oct 2012 | SF registered business | address · medium |
| Realpage, Inc. | STE 700 | Aug 2011 | SF registered business | address · medium |
| Turner Construction Co | STE 500 | Apr 2009 | SF registered business | address · medium |
| Manhattan Hub | STE 140 | Jul 2008 | SF registered business | address · medium |
| The Mechanics Bank | STE 100 | Feb 2004 | SF registered business | address · medium |
| William Blair And Company | STE 1210 | Jul 2001 | SF registered business | address · medium |
| Westamerica Bank | — | Aug 1995 | SF registered business | address · medium |
| Amer Telephone & Telegraph Co | — | Jan 1995 | SF registered business | address · medium |
San Francisco assessment roll
Parcel record
| Field | Value |
|---|---|
| block/lot | 0239030 |
| Site address | 343 SANSOME ST |
| Land use (DOR) | COMO — Commercial Office |
| Building area (actual) | — |
| Floors / units / buildings | 15 / — / — |
| Lot size | 23,905 sq ft |
| Year built | 1991 |
| Zoning (primary) | — |
| Land value | $77,822,432 |
| Building value | — |
| Total assessed value | $125,166,876 |
Recorded owner (assessment roll)
No owning organisation shown. Where the county roll names a private individual, the name and mailing address are not published here.
Location
- Address
- 343 SANSOME ST
- City
- San Francisco
Within ~650 m
Nearby office buildings
No other office parcels within ~650 m.
How does 343 SANSOME ST compare with other San Francisco office buildings?
With 15 floors it is one of 199 office buildings of ten or more floors in the metro.
Does the owner of 343 SANSOME ST hold other San Francisco office property?
San Francisco's published roll does not include owner names, so no owner is shown for any parcel in this metro.
What has happened at 343 SANSOME ST recently?
The building files energy-benchmarking disclosures — 1 report year are matched to this parcel.
What does “Commercial Office” mean for this parcel?
The San Francisco roll classifies block/lot 0239030 as “Commercial Office” (use code COMO). BuildingCensus includes a parcel in its office census when the roll gives it an office-class use, so the label is the county's, not an inference.
Frequently asked questions
Who owns 343 SANSOME ST?
San Francisco's published roll does not include owner names, so no owner is shown.
What companies have offices at 343 SANSOME ST?
17 active business locations at this building appear in San Francisco public records, including Skyline Construction Enterprises, Inc., Gursey Schneider Llp, Sansome Holdings, LLC, Wealthspire Advisors, LLC, 343 Sansome Street. Public records under-count tenants that don't hold a local receipt or register the address.
How big is 343 SANSOME ST?
The San Francisco roll records 15 floors, a build year of 1991. It sits on a 23,905 sq ft lot.
What is the assessed value of 343 SANSOME ST?
$125,166,876 on the San Francisco roll. Assessed values are taxable-roll figures, not market prices.
What is the block/lot for 343 SANSOME ST?
Block/lot 0239030, site address 343 SANSOME ST, San Francisco. It is the key to look the parcel up in the Assessor secured roll (San Francisco).
More around 343 SANSOME ST
Everything here comes from public records, and public records go stale. If you know better, say so.
Data provenance — public records only
- San Francisco — Assessor secured roll (use classes, stories, areas, assessed values — California law excludes owner names from open data, and no bulk sale-price source exists), the universal registered-business roll with suite-level addresses, and current energy benchmarking joined by parcel.
Every fact on this page is drawn from the government records above — no listing sites, no scraped platforms, no third-party images. Facts from public records are uncopyrightable; each tenancy row carries its source and match confidence. Records can lag reality — a business-tax receipt or registration at an address is evidence of occupancy, not a lease confirmation.
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Dataset updated . Source: San Francisco assessment roll, block/lot 0239030.
About this data
Source: Assessor secured roll (San Francisco), as published September 20, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “343 SANSOME ST, San Francisco, CA (block/lot 0239030)”, https://buildingcensus.com/offices/sf/office-building-e6470c46 (data as of September 20, 2026).