1 SANSOME ST
Commercial Office · San Francisco
At a glance
1 SANSOME ST in San Francisco, CA is listed on the San Francisco property roll as “Commercial Office”, block/lot 0289004. The roll records 611,000 sq ft of building area, 41 floors, a 1983 build year and an assessed value of $210,443,982.
Public record — 0 matched business locations
Tenants & business locations
No active business locations at this address appear in the public records ingested so far. That is a statement about the records, not the building: tenants without a county business-tax receipt or a Florida registration at this address are invisible to public data.
San Francisco assessment roll
Parcel record
| Field | Value |
|---|---|
| block/lot | 0289004 |
| Site address | 1 SANSOME ST |
| Land use (DOR) | COMO — Commercial Office |
| Building area (actual) | 611,000 sq ft |
| Floors / units / buildings | 41 / — / — |
| Lot size | 16,809 sq ft |
| Year built | 1983 |
| Zoning (primary) | — |
| Land value | $126,157,028 |
| Building value | — |
| Total assessed value | $210,443,982 |
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
- 1 SANSOME ST
- City
- San Francisco
Within ~650 m
Nearby office buildings
No other office parcels within ~650 m.
How does 1 SANSOME ST compare with other San Francisco office buildings?
At 611,000 sq ft, 1 SANSOME ST is about 8 times the size of the average office building on the San Francisco roll, which comes to 75,252 sq ft across 1,254 buildings.
With 41 floors it is one of 199 office buildings of ten or more floors in the metro.
Its assessed value works out to $344 per square foot of building area, against $576 across all office floor area on the roll.
Does the owner of 1 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 does “Commercial Office” mean for this parcel?
The San Francisco roll classifies block/lot 0289004 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 1 SANSOME ST?
San Francisco's published roll does not include owner names, so no owner is shown.
What companies have offices at 1 SANSOME ST?
No business locations at this building appear in the public records ingested so far — no licence, tax or registry record currently lists this address; that is a gap in the record, not proof the building is empty.
How big is 1 SANSOME ST?
The San Francisco roll records 611,000 sq ft of building area, 41 floors, a build year of 1983. It sits on a 16,809 sq ft lot.
What is the assessed value of 1 SANSOME ST?
$210,443,982 on the San Francisco roll. Assessed values are taxable-roll figures, not market prices.
What is the block/lot for 1 SANSOME ST?
Block/lot 0289004, site address 1 SANSOME ST, San Francisco. It is the key to look the parcel up in the Assessor secured roll (San Francisco).
More around 1 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 0289004.
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, “1 SANSOME ST, San Francisco, CA (block/lot 0289004)”, https://buildingcensus.com/offices/sf/office-building-995539a2 (data as of September 20, 2026).