Industrial Underwriting: Clear Heights, Dock Doors, and the Class A Spec Stack

Key Takeaways

The Spec Stack Is the Institutional Discipline

The 20-year "industrial is industrial" mental model is dead. An institutional acquisitions associate scanning a 350,000 SF distribution OM in the Inland Empire East submarket in 2026 does not start with the cap rate, the in-place rent, or the credit on the rent roll. They start with the spec stack - clear height, dock door count and configuration, ESFR sprinkler, column grid, floor load, trailer parking ratio, electrical service - because the spec stack decides what tenant universe can occupy the building, what rent the building can clear, what exit cap the building can hold, and (uniquely to industrial in 2026) whether the yard adjacent to the rectangle is a separately deedable parcel that trades at a different cap rate from the warehouse itself.

The 2024–2026 supply digestion is the reason the discipline matters now. PerCushman & Wakefield's Q2 2026 U.S. Industrial MarketBeat, national vacancy fell 10 bps to 6.9% at midyear, net absorption was 62.1M SF in the quarter (113.6M SF year to date, the strongest first half since 2023), and asking rents rose 2.9% YoY to $10.32/SF/yr, up from 2.1% in the prior quarter. PerJLL's Q2 2026 U.S. Industrial Market Dynamics, national vacancy compressed 60 bps to 6.8%, the first meaningful contraction since mid-2023, on 99.1M SF of net absorption and 175.7M SF of leasing activity, as "tenants prioritized power availability, automation-ready specifications, and skilled labor access over discounted rents in older facilities."

Bifurcation is the operative word, but it is not a simple new-versus-old vacancy story. InCushman's Q1 2026 report, vacancy in newly built buildings fell 480 bps YoY while vacancy in older product rose 70 bps to 5.6%, still below the 7.0% national rate, so the newly built decline started from a higher base. In Q2, Cushman reports that growth remained concentrated in newer facilities (137M SF of year-to-date absorption in warehouses built since 2020) and that vacancy in buildings larger than 500,000 SF has fallen 300 bps from its late-2024 peak to 8.1%, while shallow-bay product runs at 4.8%. The institutional acquirer in 2026 makes the spec call first because the call governs every downstream assumption. This article walks the new four-tier stratification (Modern Class A / Class A / Class A-minus / Class B-Legacy) with rent PSF and cap rate ranges by tier; walks the physical specs that decide the tenant universe (clear height, dock doors, ESFR, column grid, floor load, trailer parking, power); walks the industrial outdoor storage adjacency as the institutional category that 2024–2026 made core; walks the 2026 supply digestion data by market; and runs a single 350,000 SF modern Class A in the Inland Empire East through the underwriting on basis, mark-to-market, IOS yard, exit cap, and a stress case on rent, cap rate, and 18-month tenant non-renewal. Every figure in the worked example is computed from the inputs stated in the article.

The 2026 Four-Tier Industrial Stratification

The single biggest institutional shift in 2024–2026 was the unbundling of "Class A industrial" into four separate tiers with separate rent PSF, separate vacancy, and separate cap rates. The recent supply waves put a large volume of modern bulk distribution at the high end of the spec curve; the 2024–2026 digestion has revealed which buildings retain pricing power and which do not. The institutional acquirer makes the tier call before the underwriting call.

Table 1. The 2026 four-tier industrial stratification. The archetype specs, rent ranges, and cap rate ranges are illustrative assumptions that define this article's framework, not sourced market quotes. Gateway ranges are shown for the Modern Class A and Class A tiers; the Sun Belt ranges appear in the same rows. Cushman reports demand concentrating in buildings delivered since 2020, the cohort Modern Class A targets in this framework; Class A is the well-amenitized middle; Class A-minus is the contested 1990–2008-vintage zone; Class B-Legacy is structurally challenged on the article's own spec-based view and often a repositioning or IOS-conversion candidate.

The institutional read on each tier matters. Modern Class A is the article's top tier. Cushman reports demand concentrating in buildings delivered since 2020, the cohort this tier targets: build year 2018 or later, 32–36 ft+ clear, ESFR sprinkler, 54×60 (or wider) column grid, 1 trailer stall per 5,000–10,000 SF, 8–10K lb/SF floor load, 3,000–6,000+ amp power for automation. Cushman's Q1 2026 report says "Demand continues to be skewed toward modern space as occupiers prioritize automation-ready facilities with higher power capacity," which refers directly to this cohort. Class A is the well-amenitized middle: 28–32 ft clear, ESFR or modernized CMSA, build year 2008–2018 (or pre-2008 with a full modernization), the bulk of the institutional Class A cohort, leasing solidly through the digestion. Class A-minus is the contested zone where 1990–2008 vintage product lives - 24–28 ft clear, legacy sprinkler, the light-distribution / 3PL cohort that runs at submarket rents and that requires a credit read on the tenant base because the building's spec does not qualify it for the modern bulk-distribution universe. Class B-Legacy is structurally challenged at the spec layer - sub-24 ft clear, sprinkler insufficient for high-piled storage of plastics or group A commodities, pre-1990 build, light-distribution or light-manufacturing only. The Class B-Legacy cohort is increasingly the repositioning candidate - partial demolition for IOS conversion, full demolition for redevelopment, or last-mile last-resort tenancy at submarket rents.

Cushman's Q1 2026 report quantifies the direction: newly built vacancy fell 480 bps YoYwhile older-product vacancy rose 70 bps to 5.6%, still below the 7.0% national rate, so the newly built decline started from a higher base. That compares newly built against older product; it is not a measured spread between this article's tiers. Cushman's Q2 2026 report adds that vacancy in buildings larger than 500,000 SF has fallen 300 bps from its late-2024 peak to 8.1%, while shallow-bay product runs at 4.8%, the lowest of any size segment. Absorption is concentrating in newer product, but vacancy by building size does not follow a simple modern-versus-legacy line. Class A-minus and Class B-Legacy require either a deeply discounted basis or a credible repositioning thesis to clear an institutional return.

Clear Height Tiers and the Tenant Universe

The single most important physical spec on an institutional industrial acquisition is clear height, the unobstructed vertical distance from the warehouse floor to the lowest structural or mechanical obstruction. Clear height decides the tenant universe directly because racking economics, automation deployment, and high-piled storage permit eligibility all scale with vertical cube. PerEUA's clear-height analysis, the right height works backward from the pallet: a standard 64-inch pallet needs about 6 feet (72 inches) of clear height per level, and a 40-foot module does not divide evenly into those levels, leaving about 8 inches of unused height. EUA cites NAIOP and HPA Architecture's Rules of Thumb for recommended clear height by building size: 36 ft for 150,000–500,000 SF and 40 or 42 ft above 500,000 SF. The 350,000 SF worked example at 36 ft sits at that benchmark.

Table 2. Clear height tier matrix. In this article's framework the 32 ft floor qualifies the building for the modern bulk-distribution universe, the 36 ft tier unlocks AS/RS and modern e-commerce fulfillment, and the 40 ft+ tier is the trophy Modern Class A spec. Pallet levels are the article's own arithmetic: clear height in inches, less the 36 inches EUA gives for ESFR clearance above stored product (the rest of EUA's 48–54 inch allowance sits inside the roof structure above the clear-height plane), divided by 72 inches per level, rounded down (24 ft: 3.5, 28 ft: 4.2, 32 ft: 4.8, 36 ft: 5.5, 40 ft: 6.2). Sub-32 ft buildings fall outside the high end of the tenant universe in this framework, irrespective of submarket or rent.

Two operational notes shape the tier read. First, clear height interacts with sprinkler design directly: ESFR (Early Suppression Fast Response) systems are designed to suppress a fire rather than control it, and NFPA 13 sets maximum ceiling and storage heights by commodity and storage arrangement, as theQRFS ESFR guide explains and the article's next section walks. Second, clear height is not the only vertical dimension. Per EUA, ESFR heads need 12 to 18 inches below the deck and 36 inches above stored material, 48 to 54 inches in total, which is about the depth of a typical roof structure. A building marketed as "36 ft clear" without that vertical allowance may not actually permit the ESFR design the modern tenant universe expects. The institutional diligence opens the structural drawings and the fire-protection plan before signing the LOI.

Dock Doors, ESFR, Column Grid, Floor Load, Power

Clear height sets the ceiling; the rest of the spec stack determines whether the building can actually serve the modern bulk-distribution tenant. Six specs matter at the institutional read. The ranges in this section and in Table 3 are illustrative assumptions that define this article's tiers, not published standards; confirm them against the target market's tenant requirements.

Dock door count and configuration. This article's benchmark for modern bulk distribution is one dock door per 5,000–7,500 SF, so a 350,000 SF building needs 47–70 doors, and the modern e-commerce tenant universe pushes the ratio toward 1:5,000 (so 70 doors on 350,000 SF). Configuration matters as much as count. Cross-dock buildings carry doors on opposing long faces and enable flow-through distribution: inbound on one side, outbound on the other, minimal yard congestion, the modern bulk standard. Rear-load buildings carry doors on a single long face and require all truck movement on one side, which is acceptable for regional distribution but the institutional acquirer should price the tenant universe constraint. The dock door spec in this framework also includes 9×10 ft door dimensions, mechanical levelers (40–45K lb capacity), seals or shelters, and 130–135 ft truck court depth measured from face of dock to property line or centerline of adjacent drive aisle.

Trailer parking ratio. This article's Modern Class A benchmark is 1 trailer stall per 5,000–10,000 SF; Class B-Legacy often operates at 1 stall per 20,000 SF or worse. A 350,000 SF Modern Class A wants 35–70 trailer stalls on-site; the modern e-commerce tenant universe expects the high end of that range and increasingly looks for surfaced overflow yard inside the property line that can absorb peak-season trailer surge. This is the seam at which the IOS adjacency enters the underwriting - if the yard cannot accommodate the trailer ratio the tenant wants, the IOS-zoned parcel adjacent to the building (or a separately deedable yard inside the rectangle) becomes the relief valve.

ESFR sprinkler. Early Suppression Fast Response sprinklers are designed to suppress a fire rather than control it: large K-factor heads with large, high-momentum droplets and fast-response elements attack the fire directly, which in appropriate settings can eliminate the in-rack sprinklers that control-mode systems often need. CMSA (Control Mode Specific Application) and CMDA (Control Mode Density Area) sprinklers are control-mode designs that wet and cool to hold a fire in check until responders arrive. NFPA 13 sets maximum ceiling and storage heights by commodity and storage arrangement; QRFS's example from the 2022 edition is 35 ft of storage and a 40 ft ceiling for exposed expanded Group A plastics, and a warehouse above those limits may need in-rack sprinklers or a different design. ESFR is also sensitive to obstructions, so lights, ductwork, pipes, and beams have to stay clear of the spray pattern. Per theQRFS ESFR guideand itsoverview of CMDA, CMSA, and ESFR sprinklers, the right system depends on the commodity, storage height, and arrangement, so the sprinkler classification is a diligence item for a fire protection engineer rather than a yes-or-no spec. In this article's framework an ESFR-equipped building qualifies for the modern bulk-distribution tenant universe, while a CMSA-equipped building competes in the regional distribution tier with a narrower tenant search. Whether a retrofit to ESFR pencils depends on roof structure, water supply, and piping; on a legacy building with constrained clearance or piping it may simply not pencil.

Column grid. The structural column grid determines how flexibly the building can be racked and how efficiently the dock doors can be served. Modern Class A is 54×60 ftor wider (often 56×60 or 60×60 for the largest modern bulk); legacy product at40×40 to 40×50 ft carries automation and racking penalties. The wider the grid, the more flexible the racking, and the more compatible the building with the modern e-commerce and AS/RS tenant universe. The institutional read on column grid is binary at the Modern Class A tier - sub-54-ft grids almost always disqualify the building from the highest-credit modern tenants even when other specs check.

Floor load. Modern Class A floor slab specs, as an illustrative assumption, are roughly 250–300 PSFof distributed load with point loads of 8,000–10,000 lb at rack legs (the tables abbreviate this as "8–10K lb/SF"), achieved through 8–10 inch reinforced slab with appropriate sub-base. Legacy product at the 5,000–6,000 lb tier often cannot accommodate modern racking loads at full height or modern automation deployment. The institutional diligence pulls the geotechnical report and the slab specs before relying on the spec sheet.

Electrical service. Power is the 2024–2026 gating constraint on modern bulk distribution. Modern Class A specs 3,000–6,000+ amp service to support automation, EV charging for fleet electrification, and HVAC loads on the conditioned portions of the building. PerCushman's Q2 2026 MarketBeat, occupiers are prioritizing higher clear heights and greater power capacity to support automation and AI systems, and JLL's Q2 2026 report says tenants prioritized power availability, automation-ready specifications, and skilled labor access over discounted rents in older facilities. The institutional acquirer underwriting a Modern Class A building must verify in-place service capacity and the utility's commitment to any planned upgrade. A building marketed as Modern Class A with only 2,000 amp service and a 24-month utility upgrade timeline (a hypothetical) is not actually Modern Class A on the tenant search; price the spec accordingly.

Table 3. Physical specs by tier. The specs are illustrative assumptions that define this article's tiers. The 2026 institutional diligence opens the structural drawings, the fire-protection plan, the slab spec, and the utility commitment letter before signing the LOI; the spec sheet alone is insufficient because legacy product is frequently marketed at the next-higher tier than its in-place specs actually support.

Industrial Outdoor Storage: The Separately Deedable Yard

Industrial Outdoor Storage (IOS) emerged 2023–2026 as an institutional category and now sits inside many modern industrial acquisition decisions. PerMatthews's 2026 IOS Sector Update, the IOS asset class is estimated at about $218B (a Clarion estimate, up from roughly $200B in 2025), with transaction volume of $14–16B in 2025 (a 15–20% increase over 2024) and institutional capital driving 35–45% of acquisitions (up from roughly 25–30% four years ago).

The proof points are concrete. In February 2026 Brookfield agreed to acquire Peakstone Realty Trust, an industrial REIT with a strategic focus on industrial outdoor storage, for $21.00 per share in cash, an implied enterprise value of about $1.2B (perLatham & Watkins), and Brookfield announced completion of the acquisitionon May 6, 2026. Matthews reports that stabilized institutional-quality IOS trades at6.00–6.75% cap rates in primary markets and 6.75–7.75% in secondary markets, after roughly 25–50 bps of compression in top-tier markets over the past 12 months, and that IOS cap rates remain 25–75 bps above comparable industrial classes. PerHamilton Lane's June 2023 IOS paper, IOS assets could then be acquired at yields 100–250 bps above traditional industrial assets, a wider spread than Matthews reports for 2026.

Table 4. IOS as an institutional category, earlier read versus 2026. Matthews reports 25–50 bps of cap rate compression in top-tier markets over the past 12 months and a premium to comparable industrial classes of 25–75 bps; Hamilton Lane's June 2023 paper described a 100–250 bps spread and vacancy under 3% in mid-2022. Lease terms have lengthened materially, a structural sign that IOS has graduated from contractor-yard alternative to institutional-grade real estate.

The institutional thesis on IOS rests on a single structural argument: supply is constrained by zoning. Matthews estimates that 30–50% of industrial-zoned land in many major metros restricts IOS by right, with new deliveries below 2% of inventory annually. Hamilton Lane adds that many IOS sites have been rezoned or redeveloped, primarily as traditional warehouse facilities, and that local governments make new entitlements hard to obtain. Demand comes from construction and building materials (20–25% of tenant demand), logistics and trucking (20–25%), equipment rental, and utilities infrastructure, per Matthews.

Where IOS sits in an industrial warehouse underwriting decision is the operative question. Three places:

• The yard adjacent to the building is a separately deedable IOS parcel. A common 2026 institutional pattern. The acquirer underwrites the warehouse on the building's spec stack at the Class A cap rate; underwrites the adjacent IOS-zoned parcel separately on a market rent (Matthews reports $5,000–15,000 per acre per month in primary markets) at an IOS cap rate. The blended exit cap reflects the relative weight of the two components. The worked example below walks this directly.

• The building is partial or full IOS-conversion candidate. Class B-Legacy product on IOS-zoned land may be worth more as a demolished IOS yard than as an operating warehouse, particularly in last-mile infill submarkets where the building's spec is functionally obsolete but the underlying zoning supports surfaced yard use. The institutional underwrite values both paths and takes the higher.

• The building is being acquired with surplus yard that has not been monetized.Older industrial sites frequently carry surplus yard inside the rectangle that the prior owner used as truck staging or surplus parking. The institutional acquirer carves the yard as a separately deedable parcel post-close (where zoning permits) and either leases it at IOS market rent or sells it to an IOS-pure-play sponsor (the worked example assumes a 6.50% cap).

The 2026 Supply Digestion Cycle

The macro frame around any 2026 industrial acquisition starts with the supply digestion narrative. PerCREDA's Industrial Space Demand Forecast for the first quarter of 2026, which uses CoStar data, 2025 deliveries exceeded absorption by 220M SF and national vacancy rose from 6.2% at YE 2024 to 6.9% at YE 2025. The forecast: 154.8M SF of absorption in H1 2026, 345.9M SF full-year, and 267.7M SF in 2027.

The supply side is modest but no longer shrinking. PerCushman's Q2 2026 report, Q2 deliveries totaled 62M SF (down 16% YoY), first-half deliveries were 119M SF (19.2% below the first half of 2025), and the construction pipeline rose for a fourth straight quarter to 305M SF, up 18% YoY, with speculative construction up 11% QoQ. Cushman characterizes development as disciplined, with over one-third of space under construction build-to-suit. JLL puts space under construction at 276M SF, up 9.2% YoY.

Table 5. Industrial market fundamentals by market, Q2 2026 (Cushman & Wakefield preliminary data; asking rents are all-class averages). Inland Empire vacancy rose from 7.4% to 8.8% over the year and overall asking rent fell 10.7% (from $13.89 to $12.40/SF/yr, about $1.03/SF/mo); it is the only market in the table with negative Q2 net absorption, and the worked example sits in that market. Phoenix vacancy is elevated at 10.8% although absorption is positive, Atlanta vacancy is 8.5%, and the Midwest region is the tightest at 4.6%.

The cycle-turn case for 2026 rests on five points. First, vacancy: Cushman's national rate fell 10 bps to 6.9% and JLL's fell 60 bps to 6.8%, which JLL calls the first meaningful contraction since mid-2023. Second, net absorption of 62.1M SF in Q2 per Cushman (113.6M SF year to date, the strongest first half since 2023) and 99.1M SF per JLL. Third, leasing activity: JLL reports 175.7M SF, up 49.4% YoY, and Cushman reports new leasing volume at its highest since mid-2022, with year-to-date activity up 16% YoY. Fourth, asking rent growth of +2.9% YoY nationally in Cushman's Q2 data, up from +2.1% in the prior quarter, with 67% of the 83 markets Cushman tracks posting positive annual rent growth. Fifth, new supply is modest, with Q2 deliveries down 16% YoY, though the pipeline has now risen four straight quarters, so the supply response is real but not guaranteed to hold.

The cycle-turn case has obvious caveats. The Inland Empire is where the digestion shows most clearly in this data set: Cushman's vacancy there rose from 7.4% to 8.8% in a year, Q2 net absorption was negative, and overall asking rent is down 10.7% YoY, even as the market ranks second in new leasing activity year to date (28.5M SF). Phoenix vacancy at 10.8% remains elevated although absorption is positive, and Atlanta vacancy is 8.5%. The mark-to-market upside that older lease cohorts carry is heterogeneous by submarket: Cushman reports that average U.S. asking rents are up 47% over five years, but Inland Empire rents have fallen over the past year. The institutional underwrite reflects the submarket directly.

Worked Example: 350,000 SF Inland Empire East

Carry the spec stack, the IOS adjacency, and the 2026 supply-digestion data through to a single deal. The setup - before the diligence starts:

Five steps walk the underwriting.

Step 1: Acquisition basis vs replacement cost. Assume Modern Class A construction cost in the Inland Empire in 2026 runs $230–280/SF inclusive of hard costs, soft costs, contingency, and land (an illustrative assumption). At $166/SF acquisition basis on a Modern Class A spec stack, the deal is 28–41% below that replacement cost ($166 against $230 and $280), and the warehouse's $238/SF exit value sits inside the same band. That margin of safety carries through every downstream scenario. The basis is the deal's resilience.

Step 2: In-place vs market rent. The 2022-commenced lease at $0.95/SF/mo NNN, held flat to expiry for simplicity, is modestly below the 2026 IE East market for Modern Class A. This article assumes (an illustrative assumption) a Modern Class A market range of $0.90–1.10/SF/mo NNN with a $1.00 midpoint; for context, Cushman's Q2 2026 Inland Empire average asking rent across all classes is $12.40/SF/yr, about $1.03/SF/mo. At $0.95 the in-place rent is 5% below the midpoint. The underwrite assumes mark-to-market at the 2029 lease rollover. Two paths: (a)soft renewal at $1.05/SF/mo NNN (an illustrative assumption: the $1.00 midpoint plus 5% for three years of rent growth, about 1.6% a year); (b) release at market after lease expiration, with downtime and TI/LC priced separately. Base case is the soft renewal at $1.05/SF/mo.

Table 6. In-place vs market rent on the worked example. The market range and the $1.05 renewal rent are illustrative assumptions. The 2022-vintage lease at $0.95/SF/mo NNN is roughly 5% below the $1.00/SF/mo midpoint of the IE East Modern Class A range. Cushman's all-class Inland Empire average of $12.40/SF/yr (about $1.03/SF/mo) sits slightly above that midpoint, so the example deliberately uses a conservative market mark. The base-case 2029 renewal at $1.05/SF/mo lifts warehouse NOI from $3.89M going-in to $4.31M, a 10.8% uplift driven entirely by the $420K rent increase.

Step 3: IOS yard underwriting. The 5-acre IOS-zoned parcel is separately deedable and is included in the $58M basis. Matthews reports primary-market IOS rents of $5,000–15,000 per acre per month. The example assumes in-place IOS rent of $4,000/acre/mo ($240K/yr, an illustrative assumption) marking to $5,000/acre/mo, the bottom of Matthews's primary-market range, at the 2029 rollover. Matthews reports 4–6 year lease terms and 3–4% annual escalators as the institutional IOS norm in 2026; the model conservatively holds IOS NOI flat at $300K after the mark. Annual IOS revenue = 5 acres × $5,000/acre/mo × 12 = $300,000/yr. At a 6.50% IOS cap rate (inside Matthews's 6.00–6.75% range for primary markets), the IOS yard contribution to exit value is$4.6M ($923K per acre). The 100 bps spread to the 5.50% warehouse cap is wider than Matthews's 25–75 bps premium; at a 75 bps spread (6.25%) the yard would be worth about $4.8M, roughly $0.18M more, or about 0.003x of value-on-cost.

Step 4: Stabilized blended NOI and exit. Combine the components. Stabilized warehouse NOI on the soft renewal at $1.05/SF/mo NNN = $4.41M base rent − $0.10M non-recoverable costs and reserve = $4.31M. The tenant's reimbursement of taxes, insurance, and operating expenses is offset by those expenses and adds nothing to NOI. Stabilized IOS NOI = $300K, so total stabilized NOI =$4.61M. The exit in 2031 capitalizes year-5 NOI: warehouse base rent of $4.41M × (1.03)^2 = $4.68M less the $0.10M reserve = $4.58M, at a 5.50% warehouse cap (an illustrative assumption for Modern Class A IE East), plus the IOS at 6.50%. Blended exit value = $83.2M (warehouse) + $4.6M (IOS) = $87.9M, with components rounded.

Step 5: Value-on-cost. Acquisition basis $58M plus modest landlord capex through the hold (call it $0 net for the base case, given the building is 2020 vintage and the tenant has paid NNN). Exit value $87.9M. Value-on-cost = $87.9M ÷ $58M = 1.51x, measured on exit value alone without interim income. The hold runs from the 2026 acquisition through the 2029 renewal (year 3) to a 2031 exit (year 5). The unlevered IRR on annual cash flows (−$58.0M at close; NOI of $4.13M, $4.13M, $4.61M, $4.74M, and $4.88M in years 1–5; plus $87.9M of exit proceeds in year 5, before selling costs) is about 15%.

Table 7. The worked example's base-case underwriting on NNN-consistent NOI. Acquisition basis $58M ($166/SF of building area, including the 5-acre IOS parcel, 28–41% below the illustrative modern Class A replacement cost). Exit-year total NOI $4.88M (warehouse $4.58M + IOS yard $300K); blended exit value $87.9M at a 5.55% blended cap, with components rounded. Value-on-cost of 1.51x is exit value divided by basis and excludes interim income; the unlevered IRR of about 15% uses annual NOI of $4.13M, $4.13M, $4.61M, $4.74M, and $4.88M in years 1–5 plus exit proceeds in year 5, before selling costs.

Sensitivity: Rent, Cap Rate, 18-Month Non-Renewal

Base case is the institutional headline; the stress case is the institutional discipline. Three sensitivities matter: mark-to-market miss (rent), cap rate expansion, and tenant non-renewal with extended downtime. Each case below is built from the same input cascade as the base.

Table 8. Sensitivity grid on the worked example, built on NNN-consistent NOI with the exit-year escalator applied to the renewal cases (rent stress: $0.85 × 350,000 SF × 12 = $3.57M, × 1.03^2 = $3.79M, less the $0.10M reserve = $3.69M). Value-on-cost is exit value divided by capital invested: $58M basis; $63M adds the $5M TI/LC; $68.4M also adds $5.4M of base rent lost over 18 months of downtime (1.5 years × $3.57M at the $0.85 release rent). Each of the first three rows changes one variable. The two non-renewal rows assume the new lease starts after the 18 months of downtime and has no escalator step by the 2031 exit, so warehouse NOI is $0.85 × 350,000 SF × 12 = $3.57M less the $0.10M reserve = $3.47M. The non-renewal stress keeps the 5.50% exit cap and returns 1.17x on the $58M basis, 1.07x on the post-TI/LC basis, and 0.99x counting lost rent. The triple stress returns 1.04x, 0.95x, and 0.88x on the same three bases, so capital is roughly returned rather than compounded in the non-renewal case and not fully recovered in the triple stress. Components are rounded; totals are computed from unrounded values.

Mark-to-Market in a Bifurcating Market

The mark-to-market thesis is the institutional spine of every 2026 industrial acquisition. Leases that commenced in or before the 2018–2022 rent surge can sit below today's market: Cushman reports that average U.S. asking rents are up 47% over the past five years, with 12 markets posting gains above 60%. The gap varies by submarket, and in the Inland Empire, where overall asking rents have fallen over the past year, it can be narrow. The public REIT prints make the math concrete.

Per STAG Industrial's Q1 2026 earnings release (a secondary-market industrial portfolio): Cash Rent Change +20.9% and Straight-Line Rent Change +39.6% on 6.0M SF of Operating Portfolio lease commencements during Q1 2026, with new leases at +35.5% cash and renewals at +16.9%. This is a useful public-comp data point for the mark-to-market thesis, with the caveat that it comes from a secondary-market portfolio rather than the Inland Empire.

Table 9. Illustrative mark-to-market assumptions, not sourced market data, for the 2018–2022 vintage lease cohort by submarket. The Inland Empire is the narrowest read; the Midwest and Mid-Atlantic carry the widest. The institutional acquirer reads each lease against the submarket-specific 2026 market rent before pricing any rollover.

The institutional discipline on mark-to-market is to tie every assumption to specific evidence. The submarket comp set, the public REIT cash rent change prints, the broker market reports (Cushman and JLL quarterlies plus local brokerage reports), and the in-place lease abstracts all combine to produce the 2026 mark-to-market read for any specific deal. The face on the rent roll is the headline. The mark-to-market against the submarket 2026 comp set is the deal.

Five Practitioner Mistakes on Industrial Underwriting

• Underwriting the building without verifying the spec sheet against the drawings.Marketing decks routinely round clear heights up (a 31'8″ building marketed as 32 ft), inflate column grid (52×58 marketed as 54×60), and overstate trailer parking (some yard positions are paved drive aisles, not legitimate trailer stalls). The institutional diligence pulls the structural drawings, the as-built survey, the fire-protection plan, the electrical one-line, the geotechnical, and walks the site to count dock doors and trailer stalls directly. Spec discrepancies can surface at the LOI stage or later in due diligence, where they reprice the deal.

• Underwriting the IOS yard at the warehouse cap rate. A common 2026 mistake. A 5-acre IOS-zoned parcel underwritten at the warehouse's 5.50% cap rate overvalues the component by roughly 18% when the IOS cap rate is 6.50%. On a $300K IOS NOI, valuing the yard at 5.50% ($5.45M) instead of 6.50% ($4.62M) overstates exit value by about $840K; at a 25 bps spread the overstatement is about $0.24M and at a 75 bps spread (Matthews's range for 2026) about $0.65M. The risk runs in the buyer's direction: paying for yard value that does not exist. The institutional underwrite carves the IOS yard into a separate block.

• Conflating in-place rent with the 2026 submarket market rent. Leases from the 2018–2022 vintage can sit below 2026 market, but the spread is heterogeneous by submarket. Underwriting a Modern Class A IE East deal as if the mark-to- market upside matches a Dallas/Fort Worth or Midwest comp would systematically overstate the underwriting. The discipline is to tie the mark-to-market to the submarket-specific comp set with public REIT cash rent change prints such as STAG's Q1 2026 results as the public benchmark.

• Ignoring the power constraint on Modern Class A. Power capacity is a stated tenant priority in both Cushman's and JLL's Q2 2026 reports and a real underwriting constraint. A building with 2,000 amp service and a 24-month utility upgrade timeline cannot serve a modern e-commerce or AS/RS tenant on a normal lease execution timeline. Price the constraint - either as a building-spec adjustment or as an execution-risk haircut on the achievable rent.

• Stressing the cap rate without stressing rent and downtime in parallel. The institutional sensitivity grid includes a combined case that varies cap rate, rent, and lease-up timing together, not only one at a time, because in a digesting market all three can move together. A 75 bps cap rate expansion combined with a 19% rent miss combined with an 18-month tenant non-renewal is the joint scenario the institutional model has to clear. The base-case headline is for the deck; the stress case is for the IC.

From the Spec Stack to the Institutional Pro Forma

The reading above is the institutional discipline; the modeling step is what consumes it. Once you have verified the spec stack against the drawings, placed the building in the four-tier stratification, priced the in-place rent against the 2026 submarket market read, carved the IOS yard into a separately deedable block at a separate cap rate, and stress-tested the deal across rent, cap rate, and non- renewal scenarios - the next step is the institutional pro forma with debt sizing, the lease rollover schedule (if multi-tenant), the IOS yard component wired in, and the exit waterfall. We know you can do this by hand from the inputs disclosed in the article; the reader can build the same model in Apers within minutes against their actual deal.

Related Articles

• Logistics, Distribution, and E-Commerce Sensitivity in Industrial Underwriting - how trade-flow assumptions, last-mile location premium, and e-commerce penetration rate flow through to industrial demand and rent.
• Cold Storage: Specialized Modeling and Tenant Credit - the cold-storage variant of industrial underwriting with cap rate, cap-ex, and tenant credit specifics.
• Manufacturing, Flex, and Hybrid Industrial Space - the light-industrial / multi-tenant / hybrid cohort and where it fits in the four-tier stratification.
• Office Lease Analysis: Gross vs NNN and Expense Stops - the lease-structure analog from the office cluster; same expense pass-through discipline applied to a different asset class.
• Cap Rate Calculator and Formula - the going-in and exit cap math that underpins the worked example's blended exit.
• IRR Calculator and Formula for Real Estate - the IRR mechanics for the 5-year unlevered hold in the worked example.

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