A build-to-suit data center is custom-designed and built to a single tenant’s exact specifications, usually under a long-term lease signed before construction. A wholesale data center is developer-built to a standardized design and leased in large blocks of capacity to one or a few tenants. The difference is not just customization: the two models allocate development risk, timeline, and control differently, and that allocation is what owners, tenants, and construction lenders should weigh before committing. This article defines each model, explains how they differ, and sets out the advisory issues that matter. It builds on our overview of data center development.
As AI and cloud demand has pushed data center capacity to the front of the real estate market, the language around leasing models has become central to how deals are structured. Build-to-suit and wholesale are the two reference points. Understanding them, and how the line between them has begun to blur, helps an owner or lender read a data center transaction correctly.
Build-to-Suit Defined
In a build-to-suit (BTS) arrangement, a developer designs and constructs a facility to the specifications of a single, named tenant, typically under a long-term lease executed before or early in construction. The tenant drives the design decisions that matter most in a data center: the total power capacity and rack density, the redundancy tier, the cooling approach, the layout of the data halls, and the security and operational requirements. The developer builds to that specification and delivers a facility tailored to one occupant.
Because the tenant commits to a long-term lease, build-to-suit shifts what would be a large capital outlay for the tenant into a lease obligation over the term, while the developer finances and builds the asset. For a tenant whose requirements are specific enough that no standardized facility will serve them, and who has the scale and credit to anchor a long lease, build-to-suit delivers a facility matched exactly to their needs.
Wholesale Defined
A wholesale data center is built by a developer to a standardized design and leased in large blocks, often an entire data hall or a defined quantity of power and space, to one or a small number of tenants. Rather than designing around one named occupant from the ground up, the developer sets a design intended to serve a range of qualified tenants and leases finished, powered capacity.
Wholesale sits between build-to-suit and retail colocation. Retail colocation leases space by the rack or cage to many tenants; wholesale leases large contiguous blocks to few tenants; build-to-suit dedicates the whole facility to one. For a tenant whose requirements fit a standardized design and who values speed to occupancy, wholesale provides large-scale capacity without the tenant having to drive a ground-up development.
How the Two Models Differ
Tenant and customization. Build-to-suit serves one named tenant and is customized to that tenant’s specification. Wholesale serves one or a few tenants from a standardized design with limited customization within the delivered shell and systems.
Lease structure. Build-to-suit leases are long-term and typically signed before the facility exists, because the developer needs the committed tenant to justify a custom build. Wholesale leases are also substantial but are struck against capacity that is built, or being built, to a general standard, so the tenant is leasing closer to a finished product.
Timeline. Build-to-suit commits the tenant before construction and runs on the full development timeline, which in constrained markets can be extended by interconnection and long-lead electrical equipment. Wholesale generally offers faster occupancy because the facility is built or underway to a standard design.
Control and risk allocation. Build-to-suit gives the tenant the most control over the design and the most exposure to the risk that their requirements change before the facility is delivered. Wholesale gives the tenant less design control but less exposure to development and design risk, since the developer has set the specification and carries more of the build.
Who bears development risk. This is the central question. In build-to-suit, the developer builds against a signed long-term lease, so the demand risk is largely retired before construction, but the developer still carries construction and delivery risk, and the tenant carries the risk that its needs shift during a long build. In wholesale, the developer more often builds on a standardized basis, sometimes on an anchor commitment and sometimes partly speculative, and therefore carries more of the demand and absorption risk itself.
The Line Is Blurring
The clean distinction between the two models has softened as hyperscale cloud and AI tenants have begun pre-leasing entire buildings. When a single large tenant pre-leases a whole facility that a wholesale developer builds, the arrangement starts to look like build-to-suit even though it began as wholesale product. Owners and lenders should read each specific deal on its terms, who specified the design, when the lease was signed relative to construction, and how risk is allocated in the lease, rather than relying on the label alone.
Advisory and Risk-Allocation Considerations
For an owner or developer weighing the two models, the questions are about commitment and control. A build-to-suit deal is only as strong as the tenant’s credit and the lease, because the developer is building a specialized asset that may be difficult to re-tenant without modification if the deal falls through. A wholesale deal spreads that re-tenanting risk because the facility is designed to serve a range of tenants, but it exposes the developer to absorption risk on any capacity not yet leased.
For a construction lender, the leasing model shapes the loan’s risk profile directly. A build-to-suit facility backed by a creditworthy tenant and a signed long-term lease presents takeout and repayment risk that turns substantially on that single tenant and that single lease, which concentrates the credit analysis. A wholesale facility diversifies tenant risk but carries lease-up risk on unleased capacity. In both cases the lender should understand how specialized the asset is, how re-tenantable it would be, how the lease allocates the cost of changes and delays, and how the project’s power commitment and long-lead equipment affect the delivery date the lease depends on.
The practical advisory point is that the model is a risk-allocation decision, not just a procurement preference. A tenant choosing build-to-suit is accepting a longer timeline and pre-commitment in exchange for an exactly matched facility. A tenant choosing wholesale is accepting a standardized design in exchange for speed and flexibility. An owner or lender on the other side of either deal should map where the development, demand, design, and delivery risks actually sit before the structure is set.
Innergy Integral provides development advisory and construction management for data center projects in Seattle, WA and across our six-state footprint.
Common questions
What is a build-to-suit data center? A build-to-suit data center is a facility custom-designed and constructed to the specifications of a single tenant, usually under a long-term lease signed before or early in construction. The tenant drives the design, from power density and redundancy tier to layout and cooling approach, and the developer builds to that specification, so the facility matches one occupant’s requirements rather than a general-purpose standard.
What is a wholesale data center? A wholesale data center is a developer-built facility whose capacity is leased in large blocks, often an entire data hall or a defined amount of power and space, to one or a few tenants. The developer sets a standardized design to serve a range of tenants, and the tenant leases finished, powered capacity rather than directing the design from the ground up.
What is the difference between build-to-suit and wholesale data centers? A build-to-suit facility is designed around one named tenant’s exact specifications under a long-term lease, while a wholesale facility is built to a developer’s standardized design and leased in large blocks. Build-to-suit gives the tenant maximum customization but takes longer and commits them before the facility exists; wholesale gives faster occupancy and less customization. The models also differ in who bears development risk and how the lease allocates it.
When should a company choose build-to-suit over wholesale? Build-to-suit fits a tenant whose requirements are specific enough that a standardized facility will not serve them, who has the scale and creditworthiness to commit to a long-term lease, and who can accept a longer timeline to occupancy. Wholesale fits a tenant who needs capacity sooner, whose requirements fit a standardized design, or who prefers not to drive a ground-up development. The right choice depends on requirements, timeline, scale, and how much development risk the tenant is willing to take on.
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