300 CALIFORNIA ST
Commercial Office · San Francisco
At a glance
300 CALIFORNIA ST in San Francisco, CA is listed on the San Francisco property roll as “Commercial Office”, block/lot 0238002. The roll records 144,382 sq ft of building area, 8 floors, a 1946 build year and an assessed value of $67,437,520. 37 active business locations at this address appear in public records.
Derived from suite and floor strings in the occupancy records
Which floors show activity
- 8no record
- 73 on record
- 63 on record
- 53 on record
- 42 on record
- 31 on record
- 29 on record
- 1no 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 — 37 matched business locations
Tenants & business locations
| Company | Suite / floor | Since | Source | Match |
|---|---|---|---|---|
| Heffernan Insurance Brokers | STE 450 | May 2025 | SF registered business | address · medium |
| Gci General Contractors | FL 5 | Mar 2025 | SF registered business | address · medium |
| Gci Inc | FL 5 | Mar 2025 | SF registered business | address · medium |
| Gci Management & Consulting LLC | FL 5 | Mar 2025 | SF registered business | address · medium |
| 300 California | — | Jan 2025 | SF registered business | address · medium |
| Decker Electric Co Inc | STE 400 | Nov 2024 | SF registered business | address · medium |
| The Outcast Agency LLC | STE 200 | Nov 2023 | SF registered business | address · medium |
| Blueshirt Capital Advisors LLC | STE 200 | Nov 2023 | SF registered business | address · medium |
| Next Fifteen Communications Corporation | STE 200 | Nov 2023 | SF registered business | address · medium |
| Archetype Agency LLC | STE 200 | Nov 2023 | SF registered business | address · medium |
| Nectar Communications LLC | STE 200 | Nov 2023 | SF registered business | address · medium |
| Agent3 Group LLC | STE 200 | Nov 2023 | SF registered business | address · medium |
| The Blueshirt Group LLC | STE 200 | Nov 2023 | SF registered business | address · medium |
| This Machine | STE 200 | Oct 2023 | SF registered business | address · medium |
| Bugcrowd Inc | STE 220 | Sep 2023 | SF registered business | address · medium |
| Dealpath, Inc. | STE 300 | Nov 2021 | SF registered business | address · medium |
| Affiliated Engineers W Inc | FL 6 | Nov 2021 | SF registered business | address · medium |
| Carbon Health | FL 7 | Jul 2021 | SF registered business | address · medium |
| Faire Wholesale, Inc. | FL 7 | Dec 2018 | SF registered business | address · medium |
| A & A Health Care Facility Services | 600 | Sep 2017 | SF registered business | address · medium |
| Aecom-Lotus Joint Venture | STE 600 | Jul 2017 | SF registered business | address · medium |
| Bufferbox | — | Jan 2017 | SF registered business | address · medium |
| Hunt Construction Group, Inc | STE 600 | Jul 2014 | SF registered business | address · medium |
| Dmjm+Harris Inc | 600 | Jul 2012 | SF registered business | address · medium |
| Metcalf & Eddy Inc & Water Res | 400 | Jan 2012 | SF registered business | address · medium |
| Aecom Parsons Jv | 400 | Jan 2012 | SF registered business | address · medium |
| Aecom Usa Inc | 600 | Jan 2010 | SF registered business | address · medium |
| Re Sfcity 1 Lp | FL 7 | May 2009 | SF registered business | address · medium |
| Degw | — | Jan 2007 | SF registered business | address · medium |
| Aecom Usa | — | Jan 2007 | SF registered business | address · medium |
| Davis Langdon | — | Jan 2007 | SF registered business | address · medium |
| Metcalf & Eddy | — | Jan 2007 | SF registered business | address · medium |
| Dmjm | — | Jan 2007 | SF registered business | address · medium |
| Ellerbe Becket | 400 | Jan 2007 | SF registered business | address · medium |
| Aecom Technology Corp | — | Jan 2007 | SF registered business | address · medium |
| Aecom Economics | — | Jan 2007 | SF registered business | address · medium |
| Gps Consumer | — | Jan 2006 | SF registered business | address · medium |
San Francisco assessment roll
Parcel record
| Field | Value |
|---|---|
| block/lot | 0238002 |
| Site address | 300 CALIFORNIA ST |
| Land use (DOR) | COMO — Commercial Office |
| Building area (actual) | 144,382 sq ft |
| Floors / units / buildings | 8 / 2 / — |
| Lot size | 15,097 sq ft |
| Year built | 1946 |
| Zoning (primary) | — |
| Land value | $20,186,790 |
| Building value | — |
| Total assessed value | $67,437,520 |
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
- 300 CALIFORNIA ST
- City
- San Francisco
Within ~650 m
Nearby office buildings
No other office parcels within ~650 m.
How does 300 CALIFORNIA ST compare with other San Francisco office buildings?
At 144,382 sq ft, 300 CALIFORNIA ST is about twice 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 $467 per square foot of building area, against $576 across all office floor area on the roll.
Does the owner of 300 CALIFORNIA 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 300 CALIFORNIA 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 0238002 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 300 CALIFORNIA ST?
San Francisco's published roll does not include owner names, so no owner is shown.
What companies have offices at 300 CALIFORNIA ST?
37 active business locations at this building appear in San Francisco public records, including Heffernan Insurance Brokers, Gci General Contractors, Gci Inc, Gci Management & Consulting LLC, 300 California. Public records under-count tenants that don't hold a local receipt or register the address.
How big is 300 CALIFORNIA ST?
The San Francisco roll records 144,382 sq ft of building area, 8 floors, a build year of 1946. It sits on a 15,097 sq ft lot.
What is the assessed value of 300 CALIFORNIA ST?
$67,437,520 on the San Francisco roll. Assessed values are taxable-roll figures, not market prices.
What is the block/lot for 300 CALIFORNIA ST?
Block/lot 0238002, site address 300 CALIFORNIA ST, San Francisco. It is the key to look the parcel up in the Assessor secured roll (San Francisco).
More around 300 CALIFORNIA 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 0238002.
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, “300 CALIFORNIA ST, San Francisco, CA (block/lot 0238002)”, https://buildingcensus.com/offices/sf/office-building-2c808102 (data as of September 20, 2026).