Build-to-Suit Leases: CAM, NNN Exposure, and Audit Rights
A build-to-suit lease is one of the largest financial commitments a commercial tenant can make. You are not just signing a lease for an existing space. You are committing to 15 to 25 years of occupancy on a building that does not yet exist, at a CAM rate that has never been tested against actual operating history.
The landlord constructs the building to your specifications. In exchange, you commit to a long lease term that justifies the construction investment and provides the landlord's lender with a stable, creditworthy income stream. The base rent is partly a return on construction cost. The NNN obligations add the operating expenses on top of that.
What makes build-to-suit leases particularly challenging from a CAM perspective is that there is no historical data to anchor the estimates. You are agreeing to pay operating expenses for a building that has never operated. The projections the landlord provides are exactly that: projections. And they have a consistent directional bias.
What a Build-to-Suit Lease Actually Is
In a standard build-to-suit transaction, the tenant identifies a site (or the landlord presents one), agrees on a building program (size, configuration, parking, loading, finish level), and commits to a lease before construction begins. The landlord arranges financing based on the tenant's credit and the executed lease.
The tenant's lease commitment is what makes the project financeable. Without it, no lender will fund speculative construction at the scale required for a dedicated facility. This gives the tenant real leverage at the negotiating stage, which is the moment before the lease is signed. Once construction begins and the tenant is committed, that leverage evaporates.
Lease terms in build-to-suit transactions are longer than standard commercial leases. Fifteen years is common. Twenty to twenty-five years is not unusual for large or specialized facilities. The length reflects the time required for the landlord to recover the construction investment through lease income.
Most build-to-suit leases are structured as NNN leases. The tenant pays base rent plus property taxes, insurance, and CAM. Some are structured as absolute net leases, where the tenant's responsibilities extend to structural maintenance and major capital repairs. The distinction matters because it determines the floor of what you will pay over the term.
Why CAM Exposure Is Higher in New Construction
New buildings have higher operating costs during the first 1 to 3 years of operations than the same buildings will have at stabilization. The systems, landscaping, parking surfaces, and mechanical equipment are running for the first time. Initial maintenance contracts, warranty claims, and systems commissioning costs all appear in the early years.
At the same time, construction-period cost inflation compounds the issue. Materials and labor costs fluctuate, and build-to-suit projects sometimes experience cost overruns that the landlord absorbs, then attempts to recoup through operating expense definitions that allow broader pass-through of building costs.
New buildings also carry higher debt service, higher insurance premiums on new replacement cost valuations, and in some markets, higher property tax assessments on newly constructed improvements. These costs are real and they flow to the NNN tenant.
The first reconciliation in a build-to-suit lease often produces the largest true-up amount. The building spent part or all of the first year being completed and commissioned. Actual occupancy was less than full. Under a properly drafted lease, variable expenses should be grossed up to reflect full-occupancy cost equivalents. Under a poorly drafted lease, you pay your pro-rata share of actual expenses incurred on a partially occupied building, with no normalization for the occupancy anomaly.
How CAM Estimates Are Set Before the Building Exists
When you sign a build-to-suit lease before construction begins, you agree to pay NNN expenses that cannot be calculated from actual history. The landlord provides a pro forma budget showing estimated property taxes, insurance, and CAM charges. These estimates become the basis for your monthly estimated payments during the first year.
The problem with these estimates is structural. The landlord's incentive is to make the base rent look as low as possible while structuring CAM and operating expense obligations broadly. A lower headline rent makes the deal look more competitive. Broad CAM definitions ensure full cost recovery. The pro forma budget that accompanies the lease is prepared by the same party who benefits from broad definitions.
When the first reconciliation arrives, a CAM audit against your lease provisions catches discrepancies before the dispute window closes.
When the first reconciliation arrives, a CAM audit against your lease provisions catches discrepancies before the dispute window closes.
CAM estimates in build-to-suit leases tend to understate management fees and insurance in year one, which makes the first reconciliation a disappointment for tenants. The estimates also rarely account for new-construction commissioning costs, which can be significant in the first 12 to 18 months.
Property tax estimates in pre-construction leases are particularly unreliable. The assessor will value the completed building after construction, and that value may differ materially from the estimate used in the pro forma. Some jurisdictions reassess newly constructed commercial property aggressively. The NNN tenant pays the resulting tax bill regardless of how it compares to the pre-construction estimate.
Key CAM Provisions to Negotiate Pre-Construction
The period between the letter of intent and the executed lease is your negotiating window. Once the lease is signed and construction begins, the terms are fixed. These are the provisions that matter most.
First-year gross-up provision. Require that variable operating expenses in the first full calendar year of operation be grossed up to reflect what they would have been at 95 percent occupancy, even if the building was not fully leased or fully operational for the entire year. New construction rarely reaches full occupancy on day one. Without a gross-up provision, the first year's actual expenses, divided among fewer tenants, produces a distorted base that inflates your pro-rata share.
CAM cap on controllable expenses. Negotiate a cap on controllable operating expenses, typically 3 to 5 percent cumulative annual increase, beginning in the second full year of operations. The first year is often excluded from the cap because there is no baseline. Starting the cap clock in year 2, based on year-1 stabilized expenses, is reasonable and market-standard in well-negotiated build-to-suits.
Exclusions list. The operating expense definition in a build-to-suit lease needs an explicit exclusions list covering: capital expenditures, construction-period costs, developer fees, financing costs, leasing commissions, and landlord overhead above the property management level. Without an exclusions list, the landlord has broad discretion to define what constitutes an operating expense.
Audit rights. Include audit rights that allow you to review CAM records within 90 days of receiving each annual reconciliation, with a lookback of at least 3 prior years. Specify that the audit right extends to the landlord's underlying vendor contracts, not just the summary invoices. Build-to-suit leases are long. Over a 20-year term, small systematic overcharges compound into material amounts.
Reconciliation mechanics. Define when the reconciliation is due (90 days after lease year-end), what documentation must accompany it (vendor invoices, insurance certificates with premiums, tax bills), and what happens if it is late (true-up waived for the year if more than 120 days late). Getting these mechanics right in the lease avoids years of disputes over reconciliation timing and documentation.
Amortization of Build-Out Costs Through CAM
This is one of the more aggressive tactics seen in build-to-suit leases. The landlord constructs the building to the tenant's specifications. Some of those specifications exceed what a standard building would include, custom HVAC systems, specialized loading configurations, high-capacity electrical service. The landlord's position in some transactions is that these tenant-driven upgrades are "capital improvements" that can be amortized through CAM.
This position is almost always wrong under standard lease interpretation, but it depends entirely on the operating expense definition in the lease. If the definition is broad enough to include amortization of capital improvements without carving out tenant-specific construction costs, the landlord may have a contractual basis for the pass-through.
The prevention is straightforward: define what construction costs are excluded from CAM. "All costs incurred in connection with the construction of the building, including but not limited to construction costs, soft costs, developer fees, and financing costs related to construction, shall be excluded from operating expenses" is the language to negotiate. If the landlord insists on amortizing some improvement costs, require that tenant-specific construction features be explicitly excluded and that only shared-use improvements qualify for any amortized pass-through.
Also watch for "landlord improvement allocation" or "capital contribution amortization" line items in early reconciliations. These are signals that build-out costs are being routed through CAM. If your lease excludes construction costs and these items appear, you have a documented basis for dispute.
What to Do When the First Actual Reconciliation Arrives
In year 2, you receive the first reconciliation based on actual operating data. This is a critical document. It establishes the baseline from which your CAM cap will grow. It reflects how the landlord has interpreted the operating expense definitions. And it often includes charges that do not belong there.
Request the full backup documentation before accepting or paying any true-up amount. In a build-to-suit lease, request: all vendor invoices for maintenance and repair work, the management fee calculation with the fee base clearly identified, the insurance certificate and premium invoice, the property tax bill and any special assessments, and a written explanation of any line item that did not appear in the pre-construction pro forma.
Compare the actual charges against the pro forma estimate line by line. Large variances require explanation. Property tax assessments that differ significantly from the pro forma estimate may warrant a tax appeal. Management fee calculations that use a base broader than controllable expenses should be challenged if your lease specifies a narrower base.
Check for any construction-related charges that have appeared as CAM. Items like "building commissioning," "construction defect remediation," "warranty claim processing," or "systems adjustment" in the first reconciliation may represent construction costs being passed through operating expenses. Your exclusions clause should cover all of these, but landlords do not always apply lease exclusions without prompting.
After our tool flagged a management fee overcharge in a build-to-suit reconciliation, the calculation showed the fee was being charged on total operating expenses including the fee itself, a circular calculation that inflated the charge by approximately 5 percent above the lease-specified rate. The correction was straightforward once the calculation was visible, but it required requesting the underlying management contract to verify the landlord's claimed fee basis.
Frequently Asked Questions
What is a build-to-suit lease?
A build-to-suit lease is a commercial real estate arrangement where the landlord constructs a building to the tenant's specifications before the tenant takes occupancy. The tenant commits to a long lease term (typically 15 to 25 years) before construction begins, which makes the project financeable. The resulting lease is almost always structured as an NNN or absolute net lease, with the tenant paying base rent plus all or most operating expenses including property taxes, insurance, and CAM.
How are CAM charges calculated in a build-to-suit lease?
Before the building exists, CAM charges are estimated based on a landlord-prepared pro forma budget. After the building opens, the tenant pays monthly estimated CAM payments, with an annual reconciliation to actual costs. Year-one CAM is particularly important because it establishes the baseline from which the CAM cap grows. A gross-up provision in the lease ensures that year-one variable expenses are normalized to reflect full-occupancy costs, preventing distortions from partial-year occupancy or commissioning periods.
What CAM protections should tenants negotiate in a build-to-suit?
The most important protections are: a first-year gross-up provision that normalizes variable expenses to 95 percent occupancy, a cumulative annual cap on controllable expenses starting in year 2, an explicit exclusions list covering construction costs, capital expenditures, financing charges, and landlord overhead, audit rights with a 3-year lookback and cost-shifting if errors exceed 5 percent, and reconciliation delivery deadlines with consequences for late delivery. These provisions should be negotiated before the lease is signed, when the tenant has the most leverage.
Can a landlord pass construction costs through CAM in a build-to-suit?
Not under a well-drafted lease. Construction costs, developer fees, financing charges related to construction, and tenant-specific build-out expenses should all be explicitly excluded from the operating expense definition. Without a specific exclusions clause, a broadly written operating expense definition could be interpreted to allow amortization of construction-related capital costs. Line items like 'building commissioning,' 'landlord improvement allocation,' or 'capital contribution amortization' appearing in early reconciliations are signals that construction costs may be flowing through CAM.