45 FREMONT ST
Commercial Office · San Francisco
At a glance
45 FREMONT ST in San Francisco, CA is listed on the San Francisco property roll as “Commercial Office”, block/lot 3710019. The roll records 692,000 sq ft of building area, 34 floors, a 1978 build year and an assessed value of $249,147,312. 19 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 21-26 show no business on record — 6 unbroken floors, the longest such stretch here. Also quiet: 3-7, 9-11, 16-18, 13-14, 28-29. That is where the public record shows nobody, in blocks — a place to start asking, not a listing.
- 34no record
- 331 on record
- 32no record
- 312 on record
- 301 on record
- 29no record
- 28no record
- 271 on record
- 26no record
- 25no record
- 24no record
- 23no record
- 22no record
- 21no record
- 201 on record
- 191 on record
- 18no record
- 17no record
- 16no record
- 151 on record
- 14no record
- 13no record
- 121 on record
- 11no record
- 10no record
- 9no record
- 82 on record
- 7no record
- 6no record
- 5no record
- 4no record
- 3no record
- 21 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 — 19 matched business locations
Tenants & business locations
| Company | Suite / floor | Since | Source | Match |
|---|---|---|---|---|
| Collectivehealth, Inc. | STE 3100 | Aug 2026 | SF registered business | address · medium |
| Mc 45f Realty LLC | — | Jan 2026 | SF registered business | address · medium |
| Bon Appetit Management Co | FL 8 | Nov 2023 | SF registered business | address · medium |
| Berkshire Hathaway Homestate Companies | FL 27 | Oct 2023 | SF registered business | address · medium |
| Collective Health, Inc. | FL 12 | Sep 2023 | SF registered business | address · medium |
| Myriant | — | Jan 2023 | SF registered business | address · medium |
| Lewis Brisbois Bisgaard & Smith Llp | STE 3000 | Oct 2022 | SF registered business | address · medium |
| Proper Food | — | Jul 2022 | SF registered business | address · medium |
| Mediabrands Worldwide Inc | — | Jan 2021 | SF registered business | address · medium |
| Functional Software Inc Dba Sentry | FL 8 | Nov 2020 | SF registered business | address · medium |
| Gensler & Marjang | STE 1500 | Sep 2020 | SF registered business | address · medium |
| Jack Morton Worldwide Inc | — | Jan 2020 | SF registered business | address · medium |
| L.E.K. Consulting LLC | STE 3300 | Jun 2017 | SF registered business | address · medium |
| 1066 Market LLC | STE 1950 | Apr 2012 | SF registered business | address · medium |
| Richlen Construction | FL 2 | Nov 2011 | SF registered business | address · medium |
| Clearslide Inc | — | Mar 2009 | SF registered business | address · medium |
| Ca Costal Commission Marine Ed | STE 2000 | Oct 2001 | SF registered business | address · medium |
| Slack Technologies Inc | FL 31ST | Mar 1999 | SF registered business | address · medium |
| Forty-Five Fremont LLC | — | Jan 1985 | SF registered business | address · medium |
San Francisco assessment roll
Parcel record
| Field | Value |
|---|---|
| block/lot | 3710019 |
| Site address | 45 FREMONT ST |
| Land use (DOR) | COMO — Commercial Office |
| Building area (actual) | 692,000 sq ft |
| Floors / units / buildings | 34 / — / — |
| Lot size | 31,763 sq ft |
| Year built | 1978 |
| Zoning (primary) | — |
| Land value | $51,682,413 |
| Building value | — |
| Total assessed value | $249,147,312 |
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
- 45 FREMONT ST
- City
- San Francisco
Within ~650 m
Nearby office buildings
No other office parcels within ~650 m.
How does 45 FREMONT ST compare with other San Francisco office buildings?
At 692,000 sq ft, 45 FREMONT ST is about 9 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 34 floors it is one of 199 office buildings of ten or more floors in the metro.
Its assessed value works out to $360 per square foot of building area, against $576 across all office floor area on the roll.
Does the owner of 45 FREMONT 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 45 FREMONT 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 3710019 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 45 FREMONT ST?
San Francisco's published roll does not include owner names, so no owner is shown.
What companies have offices at 45 FREMONT ST?
19 active business locations at this building appear in San Francisco public records, including Collectivehealth, Inc., Mc 45f Realty LLC, Bon Appetit Management Co, Berkshire Hathaway Homestate Companies, Collective Health, Inc.. Public records under-count tenants that don't hold a local receipt or register the address.
How big is 45 FREMONT ST?
The San Francisco roll records 692,000 sq ft of building area, 34 floors, a build year of 1978. It sits on a 31,763 sq ft lot.
What is the assessed value of 45 FREMONT ST?
$249,147,312 on the San Francisco roll. Assessed values are taxable-roll figures, not market prices.
What is the block/lot for 45 FREMONT ST?
Block/lot 3710019, site address 45 FREMONT ST, San Francisco. It is the key to look the parcel up in the Assessor secured roll (San Francisco).
More around 45 FREMONT 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 3710019.
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, “45 FREMONT ST, San Francisco, CA (block/lot 3710019)”, https://buildingcensus.com/offices/sf/office-building-88ae4af7 (data as of September 20, 2026).