1050 SANSOME ST
Commercial Office · San Francisco
At a glance
1050 SANSOME ST in San Francisco, CA is listed on the San Francisco property roll as “Commercial Office”, block/lot 0135008. The roll records 35,266 sq ft of building area, 6 floors, a 1906 build year and an assessed value of $15,825,979. 3 active business locations at this address appear in public records.
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 — 3 matched business locations
Tenants & business locations
| Company | Suite / floor | Since | Source | Match |
|---|---|---|---|---|
| New Lantern, Inc. | STE 400 | Jan 2021 | SF registered business | address · medium |
| Milliken And Company | — | Dec 2017 | SF registered business | address · medium |
| Cellco Partnership | — | Jan 2013 | SF registered business | address · medium |
San Francisco assessment roll
Parcel record
| Field | Value |
|---|---|
| block/lot | 0135008 |
| Site address | 1050 SANSOME ST |
| Land use (DOR) | COMO — Commercial Office |
| Building area (actual) | 35,266 sq ft |
| Floors / units / buildings | 6 / 1 / — |
| Lot size | 5,896 sq ft |
| Year built | 1906 |
| Zoning (primary) | — |
| Land value | $9,495,589 |
| Building value | — |
| Total assessed value | $15,825,979 |
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
- 1050 SANSOME ST
- City
- San Francisco
Within ~650 m
Nearby office buildings
No other office parcels within ~650 m.
How does 1050 SANSOME ST compare with other San Francisco office buildings?
At 35,266 sq ft, 1050 SANSOME ST is about half the size of the average office building on the San Francisco roll, which comes to 75,252 sq ft across 1,254 buildings.
Its assessed value works out to $449 per square foot of building area, against $576 across all office floor area on the roll.
Does the owner of 1050 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 1050 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 0135008 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 1050 SANSOME ST?
San Francisco's published roll does not include owner names, so no owner is shown.
What companies have offices at 1050 SANSOME ST?
3 active business locations at this building appear in San Francisco public records, including New Lantern, Inc., Milliken And Company, Cellco Partnership. Public records under-count tenants that don't hold a local receipt or register the address.
How big is 1050 SANSOME ST?
The San Francisco roll records 35,266 sq ft of building area, 6 floors, a build year of 1906. It sits on a 5,896 sq ft lot.
What is the assessed value of 1050 SANSOME ST?
$15,825,979 on the San Francisco roll. Assessed values are taxable-roll figures, not market prices.
What is the block/lot for 1050 SANSOME ST?
Block/lot 0135008, site address 1050 SANSOME ST, San Francisco. It is the key to look the parcel up in the Assessor secured roll (San Francisco).
More around 1050 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 0135008.
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, “1050 SANSOME ST, San Francisco, CA (block/lot 0135008)”, https://buildingcensus.com/offices/sf/office-building-9a5fc4ca (data as of September 20, 2026).