San Francisco office supply falls to 35 large blocks

San Francisco office space for large tenants is getting scarcer, according to CBRE's third quarter 2026 report. The supply of contiguous office blocks of 100,000 square feet has dropped to 35, down from a peak of 58 three years ago. San Francisco office demand from large tenants is running ahead of that shrinking supply, with 26 tenants hunting for that much space and nine large deals pending. Landlords who hold a large contiguous block now face a market in which demand is concentrated in fewer available floors.

A contiguous block means space that sits together on one or more floors, so a tenant can occupy it as a single headquarters or large base without splitting teams across separate buildings. For technology companies, that layout matters because it allows large teams to work in one place. The drop from 58 blocks to 35 over three years shows how much of that large space has been taken up or withdrawn from the market. The CBRE report, published in the third quarter of 2026 and reported by The Registry on October 26, 2026, puts the current count at 35. The CBRE report is the source for those counts.

San Francisco office blocks shrink as tech demand grows

San Francisco office blocks of 100,000 square feet are now sought by 26 tenants at the same time, according to the CBRE figures. That number of active searches, set against 35 available blocks, leaves little slack for tenants who need a large floor plate on a short timetable. San Francisco office deals at this scale take time to negotiate, fit out and occupy, so a tenant that waits for a better block risks finding the remaining options already spoken for. Nine large deals are pending, which means a share of the current supply could move off the market if those deals close.

Tech tenants are driving the search for large space, The Registry reported, in a year of large deals for the sector. Tech tenants need large contiguous floors for headquarters teams. The report did not name the tenants or the buildings in the summary released to readers, and the full article sits behind a subscription. What the published figures do show is a market in which large tenants are competing for a smaller pool of blocks. For landlords, that competition can support rents on the remaining large floors, while smaller or split floors face a different market.

San Francisco office tenants face fewer large options

San Francisco office tenants who need 100,000 square feet or more must now weigh location, layout and timing against a thinner list of blocks. A block that fits a tenant's headcount, floor layout and transport needs may not stay available while a lease is negotiated. Brokers working for large tenants will therefore need to shortlist early and be ready to move when a suitable block appears. Tenants who can accept a phased move, or a building that needs work, may have more choice than tenants who need finished space at once.

The change from 58 blocks to 35 also affects how landlords plan refurbishment and leasing. A landlord with a large block can market it to a smaller group of large tenants, rather than splitting it for many smaller occupiers. Splitting a block can create more leases, but it can also remove the building from the large tenant market for years. Landlords must decide whether to hold a block for a large tenant, split it, or wait for a pending deal to set the rent level for the next letting.

San Francisco office market tightens for large deals

San Francisco office supply at the large end of the market is now tight enough that pending deals matter as much as completed deals. Nine deals now pending, if they close, would cut the available count further. Tenants who are not part of those pending deals may need to widen their search to blocks close to 100,000 square feet, or to buildings where a landlord can join floors to create a contiguous block. That flexibility can open options that a strict size test would miss.

The CBRE figures cover the third quarter of 2026. They do not show rents, vacancy for the whole city, or the outcome of the nine pending deals. Readers should treat the count of 35 blocks as a snapshot of large contiguous supply, not as a measure of all office space in the city.