What the numbers actually show since 2020
Two real, well-documented shifts happened at once. E-commerce-driven demand for warehouse and distribution space accelerated sharply: 2020 alone saw a record 97.5 million square feet leased directly by e-commerce occupiers, with another 77.1 million square feet transacted in 2021, according to Cushman & Wakefield research. Since 2020, the U.S. has delivered roughly 1.8 billion square feet of industrial product — more than the entire prior decade combined.
At the same time, demand for traditional downtown office space fell. CBRE reported San Francisco's downtown office vacancy rate hit a record 37% in Q2 2024, and Downtown Los Angeles's vacancy rate rose to 33.3% by Q3 2025, up from 28.8% in Q1 2024. Those aren't small or temporary numbers — they reflect a real, multi-year shift in what kind of commercial space is actually in demand.
Why downtown office space is sitting empty while the outskirts fill up
The vacancy numbers above aren't just about remote work in the abstract — they connect directly to cost and commute. Gallup research shows about 6 in 10 remote-capable employees want a hybrid arrangement rather than full-time in-office work, and separate research found roughly 74% of workers say they'd be more productive without a commute, while 28% said a shorter commute specifically would make them more willing to come into the office. Real estate research also found that around 40% of remote-capable workers used that flexibility to relocate away from high-cost urban centers toward more affordable regions.
Put together, that's a real, two-sided pressure on downtown office space: fewer employees need to be centrally located every day, and both employers and employees increasingly favor lower-cost, shorter-commute locations over premium downtown addresses. That's part of the same underlying economics pushing new commercial construction toward the outskirts rather than the urban core.
Tilt-up construction: the default cost-per-square-foot strategy for what's actually in demand
Tilt-up construction casts a building's concrete wall panels flat, on-site, usually right on the building's own slab — then cranes lift and tilt each panel into its final vertical position. For a large, simple footprint — a warehouse, a distribution center, light-industrial flex space, a big-box shell — that method is typically faster and cheaper per square foot than structural steel or masonry construction, which is exactly why it's become the go-to method for the building types actually in demand: warehouse and distribution space, not downtown office towers.
The Inland Empire is the clearest real-world example of both trends at once. CBRE reports the region's total industrial inventory now exceeds 611 million square feet, and the Inland Empire claimed the largest share of the nation's top 100 industrial leases in 2025 — CBRE calls it the country's premier distribution hub. See the Inland Empire contractors insurance page for what that concentration of tilt-up warehouse construction actually looks like on the ground.
Why so much of it is happening on the outskirts specifically
Land cost and overhead are the direct driver. Large-footprint tilt-up buildings need a lot of flat land, and flat land close to major coastal metros is expensive and scarce — building further out, in markets like the Inland Empire and the Central Valley, keeps land cost and overhead down while a company still operates within California and stays reasonably close to major highway and port infrastructure. CBRE data shows the Inland Empire's industrial rents still grew 6.4% year-over-year as of December — the second-highest rent growth of any major U.S. industrial market — even with all that new supply, which tells you real demand is absorbing it, not just cheap land sitting idle.
For a general contractor or developer, that geographic shift changes more than the drive time to a jobsite — different counties and cities mean different permitting timelines, different local labor markets, and, from an insurance standpoint, different regional carrier appetite and different exposures. Wildland-urban interface fire risk, in particular, is more common on the outskirts of several of these markets than it is downtown.
The real insurance considerations for tilt-up and shell construction
Tilt-up erection is a genuinely higher-risk phase of the project, not just a faster one. A panel is at its most vulnerable in the window between being lifted into position and being permanently connected to the rest of the structure — bracing failures during that window are a well-documented, historically real cause of serious construction incidents, which is exactly why Cal/OSHA and federal OSHA both have specific standards for tilt-up wall panel bracing and erection sequencing. See the Safety & OSHA Compliance Center for what a real job hazard analysis for a high-risk task like panel erection actually needs to cover.
On the coverage side, a large commercial shell project typically needs builders risk sized to the real value of a much bigger structure than a typical residential or light commercial job, general liability limits that match what a commercial developer or GC's contract actually requires — often higher than a smaller project — and, on larger jobs, the OCIP/CCIP wrap-up questions that come with any sizable commercial development. See the Commercial Contractor Insurance page for how a full commercial program is typically structured.
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Frequently asked questions
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Is downtown office vacancy in California actually as high as people say?
Yes — CBRE reported San Francisco's downtown office vacancy hit a record 37% in Q2 2024, and Downtown Los Angeles reached 33.3% by Q3 2025, up from 28.8% at the start of 2024. Both are real, multi-year highs, not short-term blips.
Why has tilt-up construction become so common for California commercial projects?
It's typically faster and cheaper per square foot than structural steel or masonry for large, simple footprints like warehouses and distribution centers — exactly the building types that grew fastest in demand after 2020, when e-commerce occupiers leased a record 97.5 million square feet in a single year, per Cushman & Wakefield.
Is tilt-up panel erection actually more dangerous than other construction phases?
Yes, in a specific, well-documented way. A panel is most vulnerable in the window between being lifted into position and being permanently connected to the building — bracing failures during that window are a real, historically significant cause of serious incidents, which is why Cal/OSHA and federal OSHA both have specific standards for tilt-up wall panel bracing.
Why are developers building commercial shells on the outskirts instead of downtown?
Land cost and overhead, plus a genuine drop in downtown office demand as hybrid work took hold — Gallup found about 6 in 10 remote-capable employees want a hybrid arrangement, and research shows roughly 40% of remote-capable workers relocated toward more affordable regions, reducing the need for expensive, centrally located space.
Is the Inland Empire really the largest industrial market of its kind?
By several real measures, yes. CBRE reports its total industrial inventory exceeds 611 million square feet and that it claimed the largest share of the nation's top 100 industrial leases in 2025, calling it the country's premier distribution hub.
Does a large commercial shell need different builders risk coverage than a smaller project?
Yes — builders risk should be sized to the real value of the structure being built, and a large tilt-up shell represents significantly more value than a typical smaller commercial or residential project, so the limit needs to reflect that rather than being estimated loosely.
Does building in an outskirt market change what insurance a contractor needs?
It can. Different counties and regions can mean different regional carrier appetite, different permitting timelines, and in some outskirt markets, more exposure to wildland-urban interface fire risk than a downtown jobsite would have.