Warehouse vacancy rises, but Flexe expects Q4 storage rates to climb

U.S. traditional warehouse rent growth slowed to 1.3% annually, below September’s 3.7% CPI, yet Seattle-based Flexe expects spot and lease rates to increase in Q4 as operating, inventory and transportation costs keep storage expenses elevated.

More available space has not produced cheaper storage. Flexe, which calls itself North America’s largest marketplace for flexible on-demand warehousing, frames the market as “warehouse stagflation”: vacancy keeps rising, but asking prices also edge upward.

The Flexe Spot Warehousing Index debuted in July, and the company’s Q3 State of Spot Warehousing report groups current conditions that shape inventory location and lease duration into three findings:

• Vacancy rises without bringing total storage costs down.
• Tariff-driven demand concentrates at the U.S.-Canada border.
• Port markets loosen while inland hubs tighten.

These patterns alter inventory planning. Shippers gain room but not necessarily lower occupancy, transport or handling bills, while fixed leases can outlive the trade conditions behind them. Forwarders cannot assume weaker coastal demand will automatically improve inland drayage and warehousing options.

What does rising vacancy mean for storage costs?

Flexe says the U.S. vacancy rate has continued to rise slightly over the past two years, although the expansion rate has slowed and asking rents have gone up. The report gives no national vacancy percentage, so it documents direction rather than the scale of excess capacity.

Siebrecht attributed sticky long-term pricing to developers’ 20-year cash-flow models. A building may open two years after financing, but its owner would not cut rent by 20% and lock it for five-plus years; CoStar data put average lease duration above five years.

The short-term market responds faster. Flexe reported that capacity increased in Q3 and remained available, but prices still edged higher. Siebrecht attributes that increase to inflation in warehouse operating inputs and higher interest costs on forklifts, even though short-term space remains generally less expensive than a long lease.

Flexe’s index puts spot below asking rates in 17 of the 21 regions covered. That identifies favorable markets but not savings: the report gives no dollar spread, regional weighting or sample size.

Flexe expects spot and lease rates to rise in Q4 but gives no percentage forecast. Operating inputs and transport costs explain the direction; local bids determine the budget.

How are tariffs changing warehouse demand?

Tariffs add cost pressure, especially for import-dependent industries such as aluminum, and Flexe sees demand concentrated at the U.S.-Canada border. The report names no border warehouses or quantifies border pricing, but the commercial need is clear: shippers require shorter commitments for changing volumes and tariff exposure.

Spot prices increased during Q3 in the Northeast and Midwest, the two regions Flexe tells planners to monitor. Shippers handling tariff-sensitive goods must balance those higher spot quotes against long-term leases whose rates remain elevated and inflexible.

Flexe advises shippers to build agility into supply chains and monitor regional markets rather than commit all inventory to one location. For carriers and inland 3PLs, the rail shift can add handling and drayage volume, but the report provides no freight-volume, tonnage or TEU figures for sizing it.

Where is warehouse demand moving?

Reshoring and more direct-to-inland rail imports are shifting demand away from major coastal gateways and toward inland distribution hubs. Flexe advises shippers to secure inland space as coastal demand cools. That weakens the case for storage near Seattle, Los Angeles or Savannah, while raising the importance of rail-served sites and inland drayage.

Flexe defines demand intensity as a market measure in which a higher reading indicates tighter conditions. Q3 readings fell in five of six gateway markets:

• Seattle fell from 34 to 24.
• Coastal LA fell from 29 to 20.
• Savannah fell from 48 to 38.

Demand tightened in four of five inland hubs. Chicago demand intensity gained 5%, with the measure at about $11.50 per pallet as freight moved to rail. Flexe provides no equivalent figures for the other three tightening hubs.

Siebrecht said: “What we are seeing [with demand intensity] is that a lot of this activity is bypassing the ports and flowing inland. We are seeing increased demand in inland hubs and a softening of demand in coastal places like Los Angeles and also Savannah.”

The pattern can give rail carriers and inland 3PLs more freight, but shippers face a new exposure: coastal inventory may look easier to source while onward movement and storage tighten. Without tonnage, TEU or modal share, Flexe’s data show direction, not the size of the rail shift.

How does the new benchmark work?

Flexe presents the index as its first transaction-based benchmark for short-term U.S. warehousing. The free index gives planners a shared reference for spot capacity, comparable with spot-freight indexes, and supports next-quarter or next-year scenarios across contract and spot space. Flexe likens the approach to indexes for trucking and ocean cargo.

Siebrecht said: “The equivalent had not been possible in warehousing so that is what we made possible. This is a transaction-based index that we have built on top of seven-and-a-half years of bidding data in our marketplace.”

Flexe has operated its marketplace for about a dozen years and holds thousands of data points. For requests such as seasonal peaks, tariff-related capacity or protection against a port strike, it asks its 3PL network for bids, then records low, high and winning offers against historical data across the U.S. and Canada.

The method draws on transactions rather than listings, but it also measures activity in Flexe’s own marketplace. Flexe provides no transaction count, participating-warehouse count or regional sample sizes, so planners still need current quotes before committing space.

Flexe advises shippers to build flexibility, monitor Northeast and Midwest spot markets, and prioritize inland distribution space as coastal demand cools. The Q4 test: Flexe expects spot and lease rates to rise, and continued rail-led shifts could keep inland hubs tight even as Seattle, Coastal LA and Savannah soften.