Comparing two lease proposals sounds straightforward until one runs five years and the other runs ten. Net present value alone will not settle the question because a longer lease generates more cash outflows simply by virtue of its duration. The technique that resolves this — Equivalent Annual Cost: How to Compare Leases of Unequal Length — converts every proposal to a common annual currency so advisers can make an apples-to-apples decision regardless of term.
Why Standard NPV Falls Short for Unequal Terms
Net present value is the workhorse of lease economics, and for good reason. It discounts every future cash outflow — base rent, operating expense contributions, fit-out amortization, parking, and any other contractual obligation — back to a single present-day figure using a chosen cost of capital.
The problem appears when two leases have different durations. A ten-year lease will almost always show a higher NPV of costs than a five-year lease, even if the ten-year deal is structurally cheaper on a per-year basis. The comparison is not meaningful because the time horizons are mismatched.
Advisers who stop at NPV in this situation are comparing the total price of two grocery trips of different sizes. The right question is not which trip cost more in total — it is which trip cost more per item. Equivalent Annual Cost (EAC) answers the per-item version of that question for lease obligations.
EAC also matters when a tenant is weighing whether to extend, restructure, or vacate. Each path produces a different tenor of commitment, so a straight cost comparison misleads. Converting every path to an annualized figure puts the decision on stable footing from the outset.
The Core Formula and Its Mechanics
The Equivalent Annual Cost formula has three inputs: the net present value of all costs associated with a lease, the discount rate used to calculate that NPV, and the number of periods in the lease term. The output is the constant annual payment that, if paid every year for the full term, would produce exactly the same present value as the actual cash flow stream.
Expressed in standard notation, EAC equals the NPV of costs multiplied by the discount rate, divided by one minus the quantity one plus the discount rate raised to the negative power of the number of periods. This is structurally identical to the annuity payment formula used in mortgage amortization.
The elegance of the formula is that it collapses any pattern of payments — rents that step up, free-rent periods, tenant improvement allowances, early-termination fees — into a single normalized annual figure. That figure can then be placed next to the EAC of a competing lease of any duration and compared directly.
One practical note: the discount rate should reflect the occupier's actual cost of capital, not an industry average or a rate borrowed from a capital-markets context. Using a rate that is too low will understate the value of a shorter obligation; using one that is too high will punish long-term stability unfairly. The rate is a business decision, not a formula input to be guessed.
Building the Cash Flow Schedule Before You Annualize
The quality of an EAC analysis depends entirely on the quality of the cash flow schedule that feeds it. Advisers who rush to the formula without a thorough schedule end up annualizing an incomplete picture.
The schedule should capture every quantifiable obligation over the full lease term. Base rent belongs in year one, stepped according to any contractual escalation clauses. Operating expense reimbursements — whether gross-up adjustments, base-year stops, or full triple-net obligations — belong as separate line items so they can be stress-tested independently.
Tenant improvement allowances and landlord concessions are costs to the landlord that offset the occupier's cash outflows. They must be included as negative costs in the occupier's schedule and placed in the period they are actually received, not the period they are negotiated. Free-rent periods are also cash outflows of zero in those months, which affects the NPV calculation differently than a rent abatement spread across the term.
Parking, signage fees, storage, rooftop antenna rights, and generator access charges are frequently omitted in preliminary comparisons and then surface during lease execution. Including them from the first draft of the schedule prevents the EAC from shifting materially as a deal moves toward signing.
After the schedule is populated, it is worth running a sanity check: the sum of undiscounted cash flows should match what a simple multiplication of average annual rent times term would produce, give or take concession timing. A meaningful discrepancy signals a data-entry error before it reaches the formula.
Handling Free Rent and Step Rents Inside the EAC Framework
Free rent is one of the most common negotiated concessions in commercial leases, and it distorts naive cost comparisons more than almost any other term. A twelve-month free-rent period on a ten-year lease represents a very different economic reality than the same concession on a five-year lease, because the free-rent fraction of the total term is higher in the shorter deal.
When you build the NPV that feeds EAC, place the free-rent months as zero-payment periods at the start of the schedule. The discounting effect means those early zero payments reduce the NPV meaningfully because discounted cash flows in year one carry the least time penalty. This is not an error — it is accurate: the occupier genuinely benefits more from a dollar withheld in year one than from the same dollar withheld in year seven.
Step rents — where base rent escalates by a fixed dollar amount or a fixed percentage at specified intervals — require the schedule to reflect each step explicitly rather than averaging the rent across the term. Averaging is a shortcut that changes the NPV because it moves cost from later periods to earlier periods, overstating the present-value burden.
A hypothetical example illustrates the point. Suppose a lease starts at $50 per square foot and steps by $2 per square foot at years three, six, and nine of a ten-year term. The average rent across the term is $55 per square foot, but the NPV of the actual step schedule at a 7 percent discount rate will be lower than the NPV of a flat $55 rent because the higher payments occur later and are therefore discounted more heavily. The EAC derived from the actual schedule will be lower than a naive $55 average, and that difference matters when the competing lease has a different step pattern.
Choosing and Defending the Discount Rate
The discount rate is the most consequential and most debated input in lease economics. Advisers, occupiers, and finance teams frequently disagree on the right figure, and the disagreement is not purely technical — it reflects different views about what a lease obligation really costs the organization.
One defensible approach is to use the occupier's weighted average cost of capital, treating the lease as a capital deployment decision rather than an operating expense. This aligns lease cost analysis with how the finance function evaluates other long-term commitments and makes it easier to present the analysis to a CFO or investment committee.
A second approach, common in occupier advisory, is to use the risk-free rate plus a spread that reflects the occupier's credit quality. This frames the lease as a fixed obligation similar to debt, which is appropriate given that most jurisdictions now require long-term leases to be capitalized on the balance sheet under accounting standards that treat operating leases as right-of-use assets.
What matters most is consistency. Every lease proposal in a given comparison must use the same discount rate. Switching rates between proposals — even with good intentions — introduces a bias that invalidates the EAC comparison. Document the rate, the rationale, and who approved it before distributing the analysis.
Sensitivity analysis across a range of discount rates is valuable here. Running the EAC comparison at the base rate, at a rate two percentage points lower, and at a rate two percentage points higher shows how much the ranking of options depends on the rate assumption. If the same lease wins across all three scenarios, the recommendation is robust. If the winner changes at the margins, the decision requires a qualitative overlay.
The Least Common Multiple Method as a Cross-Check
Before EAC became the standard method for handling unequal lease terms, practitioners sometimes used the least common multiple approach. This method identifies the smallest number of years into which both lease terms divide evenly, then assumes each lease is renewed repeatedly until both reach that common horizon.
For a five-year lease and a ten-year lease, the least common multiple is ten years. The five-year lease is assumed to be renewed once on identical terms, so both options are compared over a ten-year horizon. For a five-year lease and a seven-year lease, the least common multiple is thirty-five years — an impractical horizon that reveals why this method has limited real-world application.
The least common multiple method produces the same ranking as EAC when the renewal assumptions are realistic, and it provides a useful sanity check for straightforward cases. However, the assumption of identical renewal terms is almost never valid: market rents change, landlord incentives shift, and the occupier's space requirements evolve over time.
EAC is the more defensible method precisely because it does not require a renewal assumption. It asks only what the obligation costs per year during the actual contracted term, and that is the question most relevant to a lease decision.
Layering in Operating Cost Risk
Base rent is only one component of occupancy cost, and in some lease structures it is not even the largest component. Operating expense escalations, capital expenditure pass-throughs, and property tax reassessments can add significant cost over a long term that does not appear in the initial rent schedule.
Advisers dealing with gross leases need to understand the base-year stop mechanism. The landlord agrees to cover operating expenses up to the amount incurred in a specified base year; costs above that threshold are passed to the tenant. If the base year has unusually low expenses — because the building was not fully occupied, or because a major capital project was deferred — the tenant's exposure in subsequent years may be substantially higher than the gross rent figure suggests.
For NNN leases, the exposure is more transparent but no less significant. The tenant pays actual operating costs, which means the EAC analysis should include a projected operating cost schedule alongside the rent schedule. Using the building's historical operating cost data, inflated at a reasonable escalation rate, produces a more complete cost picture than relying on landlord estimates.
The risk dimension also cuts across lease terms differently. A longer lease locks in rent escalation clauses but exposes the occupier to more years of operating cost uncertainty. A shorter lease reduces that exposure but introduces the risk of unfavorable market conditions at renewal. EAC captures the structured cost; advisers must discuss the unstructured risk separately.
Presenting the EAC Analysis to Decision-Makers
A technically correct EAC analysis that is presented poorly will not drive a decision. Advisers who have done the analytical work need to communicate it in a format that a CFO, a facilities committee, or a board subcommittee can act on.
The most effective presentations lead with the EAC figures in a simple side-by-side layout: Proposal A costs X per year in present-value terms; Proposal B costs Y per year. The percentage difference between them, and the absolute dollar difference multiplied by the occupied square footage, give the decision-maker an immediate sense of the economic stakes.
Below the headline figures, the presentation should show the full NPV of each option alongside the EAC, so the audience can see both the total cost commitment and the annualized equivalent. Some decision-makers will anchor on the NPV because it represents the total obligation on the balance sheet; others will prefer the EAC because it maps to their annual budget process. Providing both satisfies both audiences without requiring two separate analyses.
The sensitivity table belongs in the supporting appendix, not on the first page. Its purpose is to show that the recommendation does not collapse if the discount rate assumption is revised slightly. If the preference ranking changes at discount rates within a plausible range, that finding belongs in the main narrative as a risk flag, not buried in an appendix.
Advisers should also state clearly what the EAC does not capture: the strategic value of optionality in a shorter lease, the relationship quality with a particular landlord, the location's fit with the client's talent and logistics requirements. EAC is a cost filter, not a decision by itself. Framing it honestly builds credibility with sophisticated clients.
Applying EAC to Renewal and Extension Scenarios
EAC is particularly useful when an occupier is weighing a lease extension against a relocation. The extension has a known starting rent and escalation structure; the relocation has an estimated effective rent that includes free rent, tenant improvement allowances, and moving costs. Converting both to EAC places them on the same footing.
Moving costs are often treated as a separate, one-time expense rather than part of the lease cost comparison. The more rigorous approach is to include them in the relocation's cash flow schedule in the year they are incurred, so the NPV — and therefore the EAC — reflects the full economic cost of choosing that path.
Holdover risk is another dimension that affects extension analyses. If a tenant does not renew and enters holdover at a rate specified in the existing lease — often 150 percent of the final year's rent — the cost of that holdover period belongs in any scenario that includes a timing gap between leases. Including it in the schedule rather than treating it as a footnote prevents the relocation option from appearing cheaper than it actually is.
Advisers who build extension versus relocation models should also account for the period of reduced productivity during a physical move. While productivity loss is difficult to quantify precisely, a conservative estimate — developed with the occupier's operations or HR team — can be expressed as a cost and included in the schedule. Labelling it as a hypothetical estimate maintains analytical integrity.
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Integrating EAC into a Repeatable Advisory Process
The EAC methodology becomes more valuable — and more defensible — when it is embedded in a repeatable process rather than reconstructed for every engagement. Advisers who standardize the cash flow schedule template, the discount rate approval step, the sensitivity table format, and the client presentation layout build institutional knowledge that survives staff turnover and scales across a team.
A repeatable process begins with a standard intake: what is the occupier's cost of capital, what lease terms are on the table, and what operating cost structure applies to each building under consideration? Getting these inputs in writing at the start of the engagement prevents disputes later about whose assumptions were used.
The schedule template should be versioned. Each time the landlord revises a proposal, the adviser saves a new version of the schedule rather than overwriting the prior one. This creates an audit trail that shows how the EAC evolved as terms were negotiated, which is valuable both for client reporting and for post-transaction review.
Review before distributing any analysis is a discipline that separate strong advisory practices from reactive ones. Having a second set of eyes confirm that the discount rate is consistent across all proposals, that the cash flow schedule covers the full term, and that the EAC formula is applied correctly takes less time than correcting an error after the client has already circulated the figures internally.
Stress-Testing the Preferred Option
No lease decision should be presented to a client without at least one stress test of the preferred option. EAC gives the base-case answer; stress testing reveals how much the answer changes if conditions shift.
The most useful stress tests for lease comparisons are: an increase in the discount rate of two to three percentage points, reflecting a tighter credit environment; an acceleration of operating expense escalation above the base assumption; and an early-termination scenario that asks what the EAC looks like if the occupier exercises a break option at the earliest available date.
The break option stress test deserves particular attention because many occupiers negotiate break clauses without fully pricing them. A break clause has a cost — the penalty, the notice period, the loss of unamortized tenant improvement allowances — and that cost should be built into a separate EAC scenario that shows the occupier what the lease actually costs if they exit early. If the break-scenario EAC is dramatically higher than the base-case EAC, the break option provides less economic protection than it appears to on the surface.
Presenting stress-test results alongside the base-case EAC gives the client a risk-adjusted view of the decision rather than a single-point estimate. That framing is more honest and more useful, particularly for occupiers whose business planning horizons are shorter than their lease terms.
Connecting Lease Economics to Portfolio Strategy
EAC is most commonly applied at the level of a single lease decision, but its logic extends naturally to portfolio analysis. A corporate real estate team managing a portfolio of leases can calculate the EAC of each obligation and aggregate them to understand the organization's annualized occupancy cost across all locations.
That aggregated view reveals concentration risk: if many leases expire in the same window, the portfolio faces simultaneous re-leasing exposure in multiple markets. It also reveals where the organization's cost-per-year is highest relative to the space and location value delivered, flagging candidates for restructuring or early exit.
Lease-economics analysis is not complete when the lease is signed. The EAC baseline established at lease execution becomes the benchmark against which actual occupancy costs are measured over the term. When operating expenses exceed projections, the adviser or corporate real estate team can recalculate the implied EAC and use it to evaluate whether a restructuring conversation with the landlord is warranted.
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