Last-Mile Logistics vs Big-Box Distribution Warehouses

Introduction

Treating industrial real estate as one asset class is the single most common mistake in industrial coverage, because the deepest divide inside the sector cuts straight through the e-commerce story everyone tells about it. Last-mile logistics warehouses, the smaller urban infill buildings that handle final-stage delivery, and big-box distribution warehouses, the large regional fulfillment centers feeding multi-state networks, share that demand driver but trade on different rents, different vacancy, different lease-up speeds, and different tenant credit. Through 2025 the gap widened rather than closed. Last-mile space under 50,000 sqft cleared the year at 3.8% vacancy with rents around $13/sqft and positive rent growth, while large-format bulk product (100,000+ sqft) carried the spec-construction overhang built up between 2021 and 2024, pushing vacancy on the biggest boxes above 10%. A new sub-50K building leased in roughly 4 to 5 months; a fresh big-box could sit empty for a year or more.

The split is not academic. It decides which peer set a REIT belongs to, which private platform competes for a given deal, and how a relative-value call gets framed inside the industrial sector cycle. An analyst who collapses the two sub-segments into a single industrial number misses the divergence that has driven most of the sector's dispersion in returns.

The most visible economic divergence between last-mile and big-box is the rent premium that last-mile commands. The 2025 averages:

Two forces hold the premium in place, and both are supply stories more than demand stories. The first is the cost arithmetic the tenant runs: last-mile space at $13/sqft is roughly 70-80% more expensive than bulk product at $7-7.50/sqft, but the transportation savings from shorter driver routes and less fuel typically swamp the rent difference for a high-velocity e-commerce operator, so paying up for proximity is the cheaper option overall. The second, and the more durable, is that almost nobody can build new last-mile supply.

Last-Mile Warehouse

An industrial building within roughly 5 to 15 miles of a major population center, usually 25,000 to 250,000 square feet, that handles the final-stage delivery leg for e-commerce, grocery, parcel, and same-day fulfillment. Compared with big-box, it carries denser dock doors, heavy vehicle-staging and parking, shorter clear heights (24 to 32 feet, since the work does not need deep racking), and higher-grade interior finishes for round-the-clock operations.

Developers spent the recent boom building almost exclusively Class A big-box (100,000+ sqft), leaving the small-bay infill segment structurally undersupplied. The industrial-zoned land within 15 miles of the major metros (New York and northern New Jersey, Los Angeles, the Bay Area, Boston, Seattle, Chicago, Dallas, Houston, Miami, Atlanta) is nearly built out. Existing buildings can be redeveloped at higher density, but net new last-mile supply barely moves, and the constraint worsens as urban populations grow.

Big-box supply behaves the opposite way. Large-format logistics typically sits 30 to 60-plus miles out, where industrial-zoned land is available at scale and entitlement is routine, so supply responds elastically to demand. That elasticity is exactly what produced the 2021-to-2024 spec wave and the vacancy overhang the segment spent 2025 absorbing.

One spec metric captures the physical difference cleanly. The site coverage ratio divides a building's footprint by its land area, and big-box developers on cheap exurban land deliberately keep it low to leave room for the deep trailer storage, truck courts, and auto parking that bulk distribution needs.

Modern big-box typically runs a coverage ratio in the 30% to 45% range precisely because the trailer-parking apron is part of the product. Last-mile infill sites, hemmed in by the metros they sit inside, are forced to far higher coverage with cramped courts, which is one more reason their supply cannot scale to meet demand.

The clearest place to see the supply imbalance is the speed at which new space finds a tenant. A finished sub-50K last-mile building leased in roughly 4 to 5 months in 2025 and sat at 3.8% vacancy with positive rent growth. A finished big-box could take a year or more, and vacancy on the largest formats (250,000+ sqft) climbed above 10% as the spec overhang worked through; the broad US industrial vacancy rate touched 7.3% mid-year, its highest since 2013.

The story is not static, though, and an analyst quoting only the slump risks sounding a quarter behind. Big-box leasing rebounded sharply in the second half of 2025: leases above 500,000 sqft jumped about 32% year over year, the inventory of available 1M+ sqft buildings thinned to a handful, and large-format vacancy began turning down. The structural picture still favors last-mile, but big-box is a cyclical recovery rather than a one-way decline, which is precisely the nuance that separates a current read from a recycled one.

That divergence is what drives the trading-multiple spread across industrial REITs. Last-mile-concentrated names such as Rexford and Terreno have carried premium multiples on the back of tighter vacancy and steadier rent growth, while more big-box-weighted exposure (STAG, parts of EastGroup) has tracked the bulkier, more cyclical end of the curve.

Big-box product itself is a different animal: large-format buildings of 150,000 to over 1,200,000 sqft, 36 to 40-foot clear heights for deep racking, wide column spacing, one dock per 10,000 to 15,000 sqft, and locations far enough out that land is available at scale. Its tenants and lease economics diverge from last-mile in ways that matter for credit.

The clear-height gap is what actually separates the formats economically, because the true capacity of a logistics building is its cubic volume, not its floor area. A racking-driven big-box at 38-foot clear holds far more pallet positions per square foot than a 28-foot last-mile building, so cube is the unit that matters.

A 200,000 sqft big-box at a 40-foot clear height offers 8.0 million cubic feet of stackable volume, while the same footprint at a 28-foot last-mile clear height yields only 5.6 million, a 30% gap in usable cube on identical floor area. That is why bulk tenants chase clear height while last-mile tenants, whose work is staging and sortation rather than deep racking, will trade it away for proximity.

The two segments rent to different occupiers, and that difference, more than the rent gap, governs where cap rates land. Big-box tenants skew toward investment-grade national retailers (Walmart, Target, Costco, Home Depot, Lowe's), pure-play e-commerce, and the large 3PLs (FedEx Supply Chain, UPS Supply Chain Solutions). Leases run long, commonly 10 to 15-plus year NNN structures with firm escalators, and the strength of that credit base supports the tightest cap rates anywhere in industrial.

Last-mile rents to a broader and more uneven roster: delivery-station operators and quick-commerce fulfillment alongside grocery delivery (Instacart, Amazon Fresh), parcel and courier users, regional 3PLs serving e-commerce clients, and specialty operators in food, pharmaceutical, and fashion express. Lease terms are shorter, often 5 to 7 years, and credit ranges widely. The practical result is a barbell: the highest-credit last-mile deals price as tight as anything in the sector, while weaker-covenant infill trades at a discount that the location premium only partly offsets. Much of the institutional money chasing the high-credit end of this segment runs through the large private vehicles, the last-mile-focused platforms like Mileway and Link Logistics, as much as through the public REITs.

For a coverage analyst, the takeaway is to stop quoting a single industrial cap rate or vacancy number. The supply-demand setup, the rent-growth trajectory, and the credit mix all move differently across the two sub-segments, and a relative-value call that aggregates them into one figure will be wrong in both directions at once.