Build To Suit Lease Calculator
In a build-to-suit lease, a developer builds exactly the building a tenant needs, and the tenant signs a long lease, usually 10 to 20 years, instead of buying. The rent is not a market guess. It is manufactured from the project itself: add up what the building costs to create, apply the developer’s required return to that total, and you have the year-one rent everything else negotiates around.
This calculator runs that developer maths in the open. Enter construction cost, land cost, and development and soft costs, plus the building size, lease term, capitalization rate, financing rate, annual escalation, and residual value assumption. It returns total project cost, base annual rent, first-year monthly rent, total rent across the whole term with escalations compounded, cost per square foot per year, residual value, and one comparison line: what the same project cost would cost per month if it were simply financed as a loan at your interest rate.
How it was calculated
Planning estimates only. Real build-to-suit deals add operating expenses, tenant improvement allowances, taxes, and negotiated incentives that this model does not include. The rent here is base rent from project cost.
Quick Answer
Key takeaways
- Rent here is yield on cost: project cost times the cap rate. Anything that raises verified project cost raises rent, which is why both sides audit the cost stack before they argue about the rate.
- Escalation is not a footnote. At 2.5% a year, a 15-year lease collects $6.81 million against $5.70 million of flat rent: over $1.1 million of the deal lives in the escalation clause.
- The amortized comparison line is a benchmark, not the rent. It shows what the same cost would run as straight debt, which is the number owner-financed proposals get measured against.
- Base rent is not occupancy cost. Taxes, insurance, common area charges, and maintenance sit outside this model, as they do in most build-to-suit negotiations until the expense structure is agreed.
How build-to-suit rent is actually set
There are two standard ways rent gets set in a build-to-suit deal, and both end at the same place: a rate of return applied to total project cost. In the fixed version, the developer prices the project up front, applies the agreed rate, and the tenant knows its rent before construction starts. In the open-book version, the rate is agreed first and the final rent is settled once actual costs are known, which makes the cost audit the real negotiation. Industry guidance for tenants describes both routes the same way: total cost means land plus hard construction plus soft costs, and the percentage applied to it reflects market conditions, the type of facility, the tenant's credit, and the lease term.
That rate is doing the same job a capitalization rate does in valuation, where cap rate is net operating income divided by value. Turned around, rent equals cost times the rate, and the completed building's value can be estimated as rent divided by the market cap rate. The gap between the rate applied to cost and the market cap rate at sale is where developer profit often sits: a national association case study built a $25 million facility at an 8% lease constant, producing $2 million of year-one rent, then sold the leased building at a 7% cap rate for about $28.5 million. Once tenants understand that spread, they negotiate the constant, the cost basis, and any sale or refinance sharing with clearer eyes. For the financing climate behind those rates, the current commercial loan rates calculator tracks what borrowing costs now, and the build cost per square foot calculator helps sanity-check the construction line before it enters the rent basis.
The calculation, step by step
Total the project. Total project cost = construction + land + development and soft costs. Nothing outside those three lines enters the rent basis in this model.
Apply the cap rate. Base annual rent = total project cost x capitalization rate. Monthly rent is the annual figure divided by 12, and cost per square foot is the annual figure divided by building size.
Compound the escalations. Each year's rent grows by the escalation percentage, and the tool sums all years of the term. Rent in year n is year-one rent x (1 + escalation) raised to (n minus 1).
Value the residue. Residual value = total project cost x your residual percentage. It is an assumption you set, not a forecast the tool makes.
Run the debt comparison. The amortized line treats project cost as a loan at the financing rate over the term and returns the monthly payment, using the standard level-payment formula.
Worked example: a 20,000 sq ft retail build
The calculator is pre-filled with this deal, and it returns exactly these figures.
| Figure | Value |
|---|---|
| Total project cost (4,000,000 + 500,000 + 250,000) | $4,750,000.00 |
| Base annual rent, year 1 (x 8%) | $380,000.00 |
| First-year monthly rent | $31,666.67 |
| Cost per sq ft per year (380,000 / 20,000) | $19.00 |
| Total rent, 15 years at 2.5% escalation | $6,814,132.13 |
| Residual value at 10% | $475,000.00 |
| Amortized monthly cost at 5.5% over 15 years | $38,811.46 |
Read the last two rent lines against each other. The cap-rate rent of $31,666.67 a month is well under the $38,811.46 it would cost to service the same $4.75 million as debt over the same term. That does not make the lease cheap in any absolute sense: the tenant pays $6.81 million across the term and owns nothing at the end, while a borrower would hold an asset. It does mean the developer's yield, at these inputs, is set below the tenant's cost of straight financing, which is a useful fact in the room. Tenants modelling the middle years of an existing lease can track the balance side with the adjusted lease balance calculator, and anyone comparing a front-loaded rent structure will find the accelerated rent calculator useful for the opposite escalation pattern.
What to negotiate besides the headline rent
Because rent is manufactured from cost and rate, the negotiation has more moving parts than a normal lease, and most of them are worth more than a tenth of a point off the cap rate.
Tenant leverage points
- A defined cost basis: which soft costs count, and a cap or audit right on overruns
- Open-book settlement if costs come in under budget, so savings lower the rent
- Escalation shape: fixed annual bumps against periodic market or index resets
- Purchase or renewal options priced now, while the tenant has leverage
Developer leverage points
- Term length and tenant credit, which justify the rate applied to cost
- Specialised fit-out with low residual value to a second tenant
- Expense structure: most build-to-suit leases are net leases, with taxes, insurance, and maintenance on the tenant
- Delivery risk: permits, materials, and timeline sit with the developer
Most build-to-suit leases are structured as net leases, often triple net, so the base rent from this calculator is the start of occupancy cost, not the end of it. Who carries property tax, insurance, and structural maintenance changes the true comparison between two proposals far more than small rate differences do, and it is settled in the lease, not in this model.
What competing calculators miss
There is effectively one dedicated rival for this exact keyword, a build-to-rent screening tool, and it prices rent with a flat rule of thumb: monthly rent equals 1% of property plus build cost. That is an investor's first-glance filter, not a lease model. Generic lease calculators are worse: they run on vehicle-style depreciation and money factors that have nothing to do with a building constructed for one tenant.
Miss 1: no cap rate on cost. The 1% rule hard-codes one yield for every market, tenant, and term. This calculator makes the rate an input, because the rate is the deal: creditworthy tenants on long terms command lower constants, and specialised buildings command higher ones.
Miss 2: no term, no escalation, no total. A monthly figure with nothing behind it cannot be taken to a board. Here the full-term total with compounded escalations is a headline output, next to the residual assumption and the per-square-foot figure tenants use to compare against conventional space.
Miss 3: no financing benchmark. The amortized comparison line answers the question every tenant eventually asks: what would this cost us as debt? No rival tool for this keyword shows it, and it reframes the negotiation when the two numbers diverge.
Frequently Asked Questions
An agreement where a developer or landlord constructs a building to a tenant's exact specifications and leases it back long term, typically 10 to 20 years. It suits retail, logistics, medical, and headquarters occupiers whose operations do not fit standard space. The tenant gets a purpose-built facility without funding construction; the developer gets a committed long-term tenant whose lease supports the investment.
From total project cost multiplied by an agreed rate of return, often called a lease constant or expressed as a capitalization rate on cost. Project cost means land plus hard construction plus soft costs. The rate reflects market conditions, facility type, tenant credit, and term length. In an open-book deal the rate is fixed first and the rent is finalised once actual costs are audited.
It shows the monthly payment if the total project cost were financed as a loan at your financing rate over the lease term. If the cap-rate rent sits well below that payment, leasing is cheaper than straight debt service at those inputs, though the tenant builds no equity. If it sits above, the developer's yield deserves a harder look. It is a benchmark for negotiation, not a second rent quote.
No. It models base rent from project cost only. Property tax, insurance, common area maintenance, and similar costs are negotiated separately in most build-to-suit deals, frequently as a net or triple-net structure on top of base rent. Add them to these figures to reach true occupancy cost before comparing proposals.
Fixed annual escalations of 2 to 3% are common in long build-to-suit leases. Some deals instead reset to market or index to inflation at set intervals. Over a 15 or 20 year term the choice matters enormously: in the worked example, 2.5% annual escalation adds over $1.1 million to the total rent compared with a flat rent.
It depends on how reusable the building is. A generic warehouse or retail box in a decent location might reasonably be tested at higher percentages of project cost; a highly specialised facility fitted for one process may be worth far less to the next occupier. The input is a straight percentage of project cost precisely so you can run conservative and optimistic cases and see how much of the argument actually depends on it.
Because the building is built for one tenant. The developer's investment only makes sense spread across a term long enough to recover the cost of a specialised asset, and lenders to the project underwrite the lease itself. Terms of 10 to 20 years are standard, with renewal and sometimes purchase options negotiated at signing, when the tenant's leverage is greatest.
That is decided by the structure, and it is one of the most important clauses in the deal. In a fixed-rent deal the developer carries overrun risk inside the agreed rent. In an open-book deal, verified overruns flow into the cost basis and raise the rent, which is why tenants in open-book structures negotiate cost definitions, caps, and audit rights before signing. This calculator prices whichever cost figures you enter; it does not allocate overrun risk.
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References
- Austin Tenant Advisors, "Tenants Guide to Build to Suit Leases in Commercial Property" - how rent is determined in a build-to-suit lease: a percentage return applied to total project cost, land plus hard and soft costs, with tenant credit and term as factors. Austin Tenant Advisors: Build to Suit Lease Guide. Accessed October 2026.
- SimonCRE, "Understanding Build to Suit Leases" - the two rent-setting methods, rate of return on overall project cost and the open-book cost approach, plus typical 10 to 20 year terms. SimonCRE: Understanding Build to Suit Leases. Accessed October 2026.
- NAIOP, Commercial Real Estate Development Association, "Creditworthy Tenants Yield Financing Alternatives" - the worked case of an 8% lease constant on a $25 million project producing $2 million of year-one rent, sold at a 7% cap rate. NAIOP: Creditworthy Tenants and Financing Alternatives. Accessed October 2026.
- PropertyMetrics, "Cap Rate Explained: Formula, Examples, and Valuation" - capitalization rate as net operating income divided by value, and the income capitalization approach this calculator's rent logic reverses. PropertyMetrics: Cap Rate Explained. Accessed October 2026.
- CommercialRealEstate.Loans, "Capitalization Rates (Cap Rates) in Commercial Real Estate" - cap rate as the appraiser's core metric in the income capitalization approach to valuation. Commercial Real Estate Glossary: Cap Rates. Accessed October 2026.
- Samuel and Associates, "Build-to-Suit Transactions Explained" - lease-based against purchase-based build-to-suit structures, and rent structured to provide the landlord's required return on development cost. Build-to-Suit Transactions Explained. Accessed October 2026.