How to Compare Speculative Industrial Buildings Against a Build-to-Suit is one of the most consequential evaluations an occupier or corporate real estate team will undertake. The decision shapes capital allocation, supply chain performance and occupancy flexibility for a decade or more, so the comparison deserves a structured, repeatable methodology rather than a back-of-envelope rent comparison.
Defining the Scope Before the Numbers Start
Every rigorous comparison begins with a clear brief, and the brief for a spec-versus-BTS evaluation must capture more than square footage. The document should define required clear height, dock and drive-in door ratios, power supply, column spacing, yard depth, office buildout percentage, and any process-specific requirements such as refrigerated storage, hazardous-material compliance, or specialized floor loading. Getting those parameters written down before touring any building prevents the evaluation from drifting toward whatever happens to be available.
The brief should also specify the intended lease or ownership term. A five-year horizon and a fifteen-year horizon produce entirely different financial profiles, and the economic case for a build-to-suit strengthens materially as the term extends. Many occupier teams make the mistake of running the comparison on a common five-year window when the real operational commitment is closer to twenty years. That mismatch skews the conclusion toward spec before the analysis has even begun.
Finally, the brief must document acceptable geographic range. A build-to-suit can often be sited on land that a speculative building will never occupy — greenfield sites beyond established industrial corridors, for example — so restricting the location search too early removes one of the BTS option's key structural advantages. The geographical brief should be wide enough to capture land-cost arbitrage opportunities while still respecting supply chain and labor constraints.
Understanding What "Speculative" Really Means for the Occupier
A speculative industrial building is designed by a developer to appeal to the broadest possible tenant universe. That design philosophy produces buildings that are functional across many uses but optimized for none. Clear heights tend to cluster around current market standards — often 36 to 40 feet in modern bulk product — office finishes are kept at a minimum, and site configurations prioritize dock count over yard geometry that any individual occupier might prefer.
The practical implication is that the occupier almost always pays for tenant improvements to make a spec shell usable for its specific operation. Those TI dollars are either funded by the landlord through a negotiated TI allowance — which is then amortized into the lease rate — or paid directly by the tenant. Either way, the cost is real, and the comparison must account for the full delivered cost of occupying the space, not just the face rent on the landlord's term sheet.
There is also the question of fit. If a food-grade operation requires floor drains, specific HVAC zoning, and grade-level drive-ins at a ratio that no existing spec building offers, the gap between spec and fit-for-purpose is large enough that the TI cost can approach or exceed what the occupier would spend customizing a build-to-suit shell. Mapping specification gaps before the financial analysis begins is therefore a prerequisite, not an afterthought.
Lease structure matters as well. Speculative buildings are almost always leased on triple-net or modified gross terms where the landlord retains fee ownership. The occupier builds no equity, and at lease expiration the landlord recaptures a building that has often appreciated while the occupier's improvements have depreciated on the tenant's books. That equity dynamic rarely surfaces in a rent comparison but can be decisive in a longer-term total-cost analysis.
Understanding the Build-to-Suit Structure
A build-to-suit is developed to the occupier's exact specification, either by the occupier itself (a user-owned development) or by a third-party developer who then leases or sells the finished asset to the occupier. The developer-driven BTS is by far the more common structure for industrial occupiers who prefer to deploy capital in their core operations rather than in real estate.
In a developer-driven BTS, the occupier signs a lease before the building exists — sometimes two or more years before occupancy — and the developer finances, constructs, and delivers the asset. The lease rent is calibrated to recover the developer's total project cost plus a return on capital, so the occupier is effectively financing the building through the rent stream. This means BTS rents in most markets are higher on a face-rate basis than comparable spec rents, which can mislead teams that compare face rates without converting them to net present value.
The user-owned BTS, by contrast, requires the occupier to acquire land, engage a general contractor, navigate entitlements, and carry construction risk. The trade-off is that the occupier retains the real estate as an asset on the balance sheet, can depreciate the building, and ultimately controls the exit — through sale, sale-leaseback, or continued ownership. For occupiers with strong balance sheets and long planning horizons, this structure can produce a compelling total occupancy cost over a twenty-year period, but the up-front capital and management burden is substantial.
Building the Comparison Framework
The methodologically sound way to structure the evaluation is to model both options to a common end date and express each as a net present value of total occupancy cost. This approach, sometimes called a lease NPV analysis or total-cost-of-occupancy model, captures rent, estimated operating expenses, TI costs, moving costs, downtime risk, and terminal value (for the owned BTS) on a single, comparable timeline.
Start by establishing the discount rate. For corporate occupiers, this is typically the company's weighted average cost of capital or, in some cases, the after-tax cost of debt if the alternative is a financed real estate purchase. Every cash flow on both sides of the comparison gets discounted back to the same present-value date using the agreed rate, which makes the two options directly comparable regardless of how their timing profiles differ.
For the spec option, the cash flow model should include base rent escalating at the contracted rate, estimated operating expense pass-throughs, one-time TI costs not covered by the landlord's allowance, moving and relocation costs, and any rent paid during a fit-out period before operations begin. If the lease includes renewal options, model the probability-weighted cost of exercising those options versus relocating at expiration, because that relocation risk has real value and is frequently omitted from simplified comparisons.
For the BTS option, the same model captures monthly rent under a developer-driven deal — or debt service and depreciation for an owned deal — TI costs that are typically minimal because the building is purpose-built, and reduced moving costs because the occupier designs the facility around its process. The comparison should also include the time-value cost of the longer development timeline, since the occupier continues paying rent elsewhere or forfeits revenue opportunity during the BTS construction period.
The terminal position of each option matters as well. At the end of the comparison horizon, a leased spec building returns to the landlord with no residual value to the occupier. An owned BTS retains balance-sheet value that must be included in the total-cost calculation to avoid understating the financial case for ownership. Failing to model this terminal difference is one of the most common errors in occupier financial analysis.
Evaluating Timing Risk and Occupancy Availability
One of the most underweighted factors in occupier decision-making is timing. A speculative building that is already standing can be occupied in weeks to a few months, depending on the TI scope. A build-to-suit in most markets requires 18 to 36 months from site control through certificate of occupancy, and that timeline can extend further if entitlements are contested, materials are delayed, or the general contractor encounters unforeseen site conditions.
If the occupier's lease expiration or operational need falls within the next 12 months, the BTS option is typically off the table unless a swing space or lease extension strategy is available. The comparison must therefore model the realistic occupancy date for each option and price the cost of any gap — temporary space, lease holdover penalties, or operational disruption — into the BTS scenario. Ignoring this cost systematically underestimates the true cost of the BTS path when the timeline is tight.
Timing risk flows in both directions, however. If the occupier's current lease has four or more years remaining and the operation is growing rapidly, locking into a spec building now may produce a space constraint that requires another move before the spec lease expires. A purpose-built facility sized precisely to a five-year growth projection avoids that second relocation cost, which should appear as a credit in the BTS scenario when the comparison horizon is long enough.
Market conditions also affect timing strategy. In a market with very low industrial vacancy and long landlord queues for spec space, the effective availability date for a desirable spec building may be further out than it appears. Construction start dates for new spec product can shift by quarters, and occupiers who have accepted a spec-available-now assumption without confirming delivery dates have found themselves holding an executed lease on a building that slipped six months.
Conducting the Site and Physical Assessment
For each option under consideration, the physical assessment must be documented with the same level of rigor. Spec buildings should be evaluated on clear height (measured to the lowest obstruction, not the stated height), dock equipment condition, column spacing against the occupier's racking or production layout, electrical service capacity and panel locations, fire-suppression system classification and coverage, and HVAC type and zoning. Each of these attributes either fits the occupier's program or requires capital to address.
The BTS site assessment is different in character. Because the building does not yet exist, the assessment is really a site due-diligence exercise: soil bearing capacity and subsidence risk, utility availability and capacity at the property line, flood zone classification and stormwater requirements, zoning entitlement certainty and timeline, and any environmental conditions that affect the construction budget.
Land pricing analysis is part of this work as well. A site that appears attractive on a land-price-per-acre basis may carry additional costs in soil conditions or utility extension that affect the total project cost relative to a competing option. Teams should work with a civil engineer and an environmental consultant to confirm the all-in land cost before committing to a site, because those costs directly affect the BTS rent or purchase price the occupier will ultimately pay.
The physical assessment for both options should be summarized in a standardized comparison document so that decision-makers can review each attribute side by side. This prevents the common problem of evaluating options sequentially — where the most recently visited building is remembered most vividly — and ensures that specification gaps receive equal attention regardless of when the site visit occurred.
Scoring the Qualitative Criteria
Not every decision factor converts neatly into a dollar figure. Operational fit, workforce access, proximity to customers or suppliers, and community relationship all influence the long-term success of an industrial facility without producing a cleanly modeled cash flow. A weighted scoring matrix is the appropriate tool for capturing these factors alongside the financial model.
The matrix should list every qualitative criterion that the occupier's stakeholders have identified as important — operational alignment, labor market depth, infrastructure quality, expansion optionality, and brand or community considerations. Each criterion receives a weight that reflects its relative importance to the operation, and each option is scored against those criteria using a consistent scale. The resulting weighted totals give leadership a single number that represents qualitative preference without conflating it with the financial analysis.
The qualitative score sits alongside the financial model rather than overriding it. Its role is to anchor the discussion when the NPV difference between options is modest, and to make explicit any qualitative premium the occupier is choosing to pay. That transparency is valuable when a recommendation must be defended to a board, an investment committee, or a parent company's real estate governance team.
A BTS that scores materially higher on operational fit and expansion optionality may well be the right choice for a growing operation, even when its NPV is modestly higher, provided the occupier's stakeholders have explicitly agreed to weight those qualitative factors accordingly. The matrix makes that trade-off visible and defensible rather than leaving it as a subjective judgment.
Running the Lease NPV and Financial Comparison
With the physical assessment complete and the qualitative scoring documented, the financial model becomes the primary decision instrument. The model should be built with transparent, documented assumptions so that any stakeholder can follow the logic and stress-test the inputs without relying on a single analyst's judgment. Teams that present only effective rent to leadership without the full NPV context are omitting information about time-value and terminal value that could alter the recommendation.
The average annual rent after accounting for TI amortization, free rent, and other concessions — sometimes called effective rent — is a useful secondary metric that helps teams sanity-check model inputs against market data. It does not, however, capture timing differences, terminal value, or the cost of development-period carry. The NPV of total occupancy cost over the full comparison horizon is the more complete framework for comparing options with different timing profiles, capital structures, and terminal positions.
Convert all cash flows to present value using the agreed discount rate and sum to a total NPV of occupancy cost over the comparison horizon. If the BTS is developer-leased, the model should also capture the reset exposure at lease expiration — specifically, what position the occupier is in if the developer sells the asset to an investor with different renewal expectations. That contingent liability has real value and should be probability-weighted rather than ignored.
Sensitivity analysis is an essential final step. The model's conclusion should be tested against variations in the discount rate, rent escalation assumptions, construction cost estimates for the BTS, and the occupier's assumed growth rate. If the recommendation changes materially under reasonable alternative assumptions, the decision-maker needs to know that before committing, not after.
Accounting for Build-to-Suit Risk Allocation
The BTS evaluation must include a clear-eyed assessment of construction and development risk. In a developer-driven deal, the developer typically bears construction cost risk up to the agreed project budget through the lease's development agreement. The occupier's exposure comes from circumstances such as the developer's financial position deteriorating during construction, force-majeure events that delay delivery, or scope changes that the occupier requests after construction begins.
Lease commencement mechanics in a BTS lease tend to be more complex than in a spec deal. Rent typically commences on the later of the agreed delivery date or the date the occupier receives a certificate of occupancy and the building meets agreed delivery conditions. Occupier teams should negotiate clear delivery conditions, a liquidated damages provision for developer delay, and a termination right if delivery is delayed beyond a maximum outside date. Those protections have real economic value that should be factored into the risk-adjusted comparison.
Change order discipline is a significant risk management point. Once a BTS is under construction, changes to the program are substantially more expensive than adjusting a TI scope in a spec lease — because structural and mechanical systems may already be in place. Teams that have not rigorously locked the facility-planning program before construction begins routinely find that change orders erode the cost advantage the BTS was supposed to deliver. The facility program should be treated as a contractual document, not a working draft.
Facility Planning and Operational Integration
The facility-planning dimension of this evaluation is where the BTS option most clearly differentiates itself. When a building is designed around the occupier's operational program, dock placement can be aligned with inbound and outbound traffic flows, column spacing can accommodate the racking system without compromise, and mechanical systems can be sized to the actual load rather than a generic approximation. That alignment has operational value that does not appear in the rent line but affects throughput, labor productivity, and safety every day the facility is in use.
For spec evaluations, the facility-planning exercise runs in a different direction: the occupier must adapt its operational program to the building's fixed geometry rather than designing the building around the program. This adaptation may require racking redesign, workflow adjustments, or acceptance of constrained throughput in certain areas. Because this cost does not appear on a rent schedule, it is frequently left unquantified — but it is nonetheless real and should be estimated by the occupier's operations team and included in the total-cost comparison.
Sustainability considerations are another dimension of the physical assessment that deserves structured treatment. Many corporate real estate programs carry internal commitments around energy performance and infrastructure that influence facility choices, including rooftop solar capacity, EV charging infrastructure, insulation values, and building management systems. A BTS provides the opportunity to design those elements in from the start, while a spec building may require retrofit investment to meet internal standards. That retrofit cost should be estimated and included in the spec scenario's total occupancy cost.
Structuring the Recommendation
When the financial model and the qualitative scoring are complete, the recommendation document should present both clearly and honestly — not advocate for whichever option the adviser preferred before the analysis began. Occupier teams and their advisers have both professional and fiduciary reasons to let the evidence lead the conclusion.
The recommendation should state the total NPV of each option over the agreed horizon, the key assumptions that drive the difference, the qualitative scores and the criteria that most differentiate the options, the principal risks in each path, and a clear statement of which option the analysis supports. That structure allows any reader to follow the reasoning from inputs to conclusion without having to accept the analyst's judgment on faith.
The recommendation document should also include a decision timeline. This means identifying the dates by which the occupier must commit to each path in order to achieve the target occupancy date, the contingencies that must be cleared before commitment such as board approval, financing, or site control, and the critical-date milestones that follow commitment. Without this timeline, occupier organizations frequently allow decision processes to drift past the point where the preferred option is still available.
That auditability is particularly important in decisions of this scale, where the financial commitment routinely runs into the tens of millions of dollars over the comparison horizon.
Carrying the Decision Through Execution
The comparison methodology does not end at the recommendation. The decision, once made, must be carried through execution with the same discipline that produced the analysis.
For a spec deal, that means managing the TI process carefully, tracking landlord milestone obligations under the lease, and monitoring lease commencement date triggers so that rent obligations and operational readiness align. Delays in TI completion are common and carry both financial and operational consequences that the occupier's project management team must actively prevent.
For a BTS, execution discipline means tracking construction progress against the project schedule, managing change orders with the rigor described in the risk-allocation section, and coordinating the operational fit-out so that the facility is production-ready the moment the certificate of occupancy is issued. A BTS carries a long chain of dependencies — site control, entitlement, permit, construction start, shell delivery, TI completion, occupancy — that must all be tracked to prevent the timeline from slipping without the occupier's awareness.
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