Commercial Property Lease vs. Buy Analysis: NPV, IRR & Break-Even Math for Every Business Decision

The lease vs. buy decision is one of the most consequential financial choices a business will make. Get it wrong and you lock up capital that could fuel growth, or you bleed cash on rent with nothing to show for it a decade later. Get it right and you gain either strategic flexibility or long-term wealth creation, depending on your circumstances.

Yet most businesses make this decision based on gut feeling or a single spreadsheet comparison of monthly payments. That approach misses the full picture: opportunity cost, tax shields, equity accumulation, residual value risk, and the time value of money. In this guide, we walk through the complete financial analysis, including NPV, IRR, break-even, and sensitivity analysis, with real numbers you can adapt to your own situation.

The Decision Framework: When Leasing Wins vs. When Buying Wins

Before diving into the math, it helps to understand the strategic factors that tilt the analysis in one direction. Financial models are only as useful as the assumptions behind them, and those assumptions depend heavily on your business context.

When Leasing Makes Strategic Sense

• Your business is growing rapidly and you may need to expand, relocate, or reconfigure your space within 3-5 years. The flexibility premium of a lease is worth paying when your space needs are uncertain.
• Capital is constrained or expensive. If your business has a WACC above 10% or you have higher-return investment opportunities, tying up $400K-$600K in a down payment has a steep opportunity cost.
• You operate in a volatile industry. Restaurants, retail startups, and early-stage tech companies face high failure rates. A lease limits your downside to the remaining lease obligation rather than an illiquid property.
• The local market is flat or declining. If commercial property values in your area have stagnated or fallen over the past 5-10 years, the equity-building argument for ownership weakens substantially.
• You want operational simplicity. Property ownership requires managing maintenance, insurance, property taxes, capital improvements, and compliance. Leasing offloads much of this to the landlord.

When Buying Makes Strategic Sense

• You plan to occupy the space for 10+ years. The longer your time horizon, the more buying favors you, because you amortize transaction costs and benefit from equity accumulation.
• You have excess capital or access to cheap debt. With SBA 504 loans offering rates around 6.0-6.5% for owner-occupied commercial property, the cost of capital can be quite attractive.
• You want to build long-term wealth outside the business. Property ownership creates a retirement asset and potential rental income once you no longer need the space.
• Your space requirements are highly specialized. Medical offices, manufacturing facilities, and cold-storage warehouses are expensive to build out. Owning lets you amortize that investment over a longer period without worrying about lease renewal risk.
• The local market has strong appreciation fundamentals. Growing metro areas with constrained supply and expanding employment bases tend to deliver consistent property appreciation.

Scenario Setup: The Numbers We Will Use

To make this analysis concrete, we will use a 5,000 sq ft commercial office property with the following baseline assumptions throughout every calculation in this guide:

• Property value: $2,100,000
• Down payment: 25% = $525,000
• Mortgage: $1,575,000 at 6.5% fixed, 25-year amortization
• Annual lease rate: $36/sq ft NNN = $180,000/year (Year 1)
• Annual lease escalation: 3%
• NNN expenses (tenant-paid): $12/sq ft = $60,000/year
• Property appreciation: 3% annually (baseline scenario)
• Discount rate (WACC): 9%
• Analysis period: 10 years
• Tax rate: 25% (combined federal + state effective rate)

Total Cost of Leasing: 10-Year Projection

In a triple-net (NNN) lease, the tenant pays base rent plus property taxes, insurance, and common area maintenance. With a 3% annual escalation on base rent and NNN expenses growing at approximately 2.5% annually, the total occupancy cost compounds significantly over a decade.

Total Cost of Buying: 10-Year Projection

Ownership costs include the mortgage payment, property taxes, insurance, maintenance reserves, and the initial down payment. However, ownership also generates equity through principal paydown and property appreciation.

10-year total cash out for ownership: $1,999,272 (excluding the $525,000 down payment). Including the down payment, total cash deployed is $2,524,272. However, after 10 years you have built approximately $358,590 in equity through principal paydown, plus the property has appreciated to an estimated $2,822,370 (at 3% annual appreciation).

NPV Comparison: The Time-Value-of-Money Analysis

Comparing raw dollar totals is misleading because it ignores when each cash flow occurs. A dollar paid in Year 10 costs you less in today's terms than a dollar paid today. Net Present Value (NPV) discounts all future cash flows back to the present using your company's cost of capital.

NPV of Leasing

NPV of Buying

The buying NPV is more complex because we must account for the upfront down payment, annual operating costs, tax benefits, and the terminal value (property sale proceeds minus remaining mortgage) at Year 10.

Side-by-Side NPV Comparison

IRR Calculation: What Return Does Buying Actually Deliver?

The Internal Rate of Return (IRR) tells you the annualized return on the capital you invest in purchasing the property. It is the discount rate that makes the NPV of all cash flows equal to zero. For an owner-occupant, cash flows include the down payment, annual net cost savings vs. leasing, and the terminal equity value.

An IRR of 34.7% looks extremely attractive, but remember: this is partly because the "cash flows" include avoided rent. If you already have a free or very cheap space, the IRR on buying drops substantially. The IRR also changes dramatically with different appreciation assumptions.

Sensitivity Analysis: IRR at Different Appreciation Rates

Tax Implications: Lease vs. Buy

The tax treatment differs significantly between leasing and buying. Understanding these differences can shift the NPV comparison by tens of thousands of dollars.

Leasing provides a slightly higher Year 1 tax deduction because 100% of lease payments are immediately deductible, while buying locks some tax benefit into depreciation schedules. However, ownership generates long-term equity that offsets this short-term tax advantage. Also note that depreciation recapture at sale can create a significant tax liability that reduces your net terminal value.

Opportunity Cost Analysis: What Else Could the Down Payment Earn?

The $525,000 down payment is capital that could be deployed elsewhere. If your business earns strong returns, that money may generate more value than real estate equity. This is the most frequently overlooked factor in the lease vs. buy analysis.

If your business consistently generates returns above 12-15%, leasing almost certainly makes more financial sense regardless of real estate appreciation. The down payment is better deployed in your core business. Conversely, if your best alternative investment yields 6-7%, real estate looks attractive by comparison.

Break-Even Analysis: When Does Buying Become Cheaper?

The break-even point is the year at which cumulative ownership costs (including opportunity cost of the down payment) cross below cumulative leasing costs, accounting for equity build-up in the property.

Lease vs. Buy Across 8 Key Dimensions

Industry-Specific Considerations

The lease vs. buy calculus varies dramatically by industry because each sector has different space requirements, build-out costs, and operational stability profiles.

Medical & Dental Practices

Recommendation: Buy when possible. Medical build-outs routinely cost $150-$300/sq ft, and specialized plumbing, electrical, and radiation shielding cannot be moved. Owning eliminates the risk of losing this massive investment at lease end. Additionally, medical practices typically have stable, long-term patient bases tied to specific locations, making the 10+ year holding period natural.

Restaurants & Food Service

Recommendation: Lease in most cases. The restaurant industry has a 60% failure rate within the first three years. Even successful restaurants may need to relocate based on shifting neighborhood demographics. A lease limits your downside. However, established restaurant groups with proven concepts and 10+ year track records may benefit from ownership, especially if they can lease excess space.

Warehouse & Distribution

Recommendation: Buy for stable operations, lease for growth-phase companies. Warehouse space is relatively commodity-like with lower build-out costs, making leasing easy. But if your distribution needs are stable and you require specialized features (cold storage, dock configurations, ceiling height), buying locks in those specs and avoids the risk of rent spikes in tight industrial markets.

Professional Office

Recommendation: Lease unless you have 10+ year certainty. The office market is undergoing structural change with hybrid work models. Space requirements per employee have dropped 15-25% since 2020. Buying locks you into a fixed footprint when you may need significantly less (or different) space in 5 years. Leasing preserves the option to right-size.

12-Item Checklist: Making the Lease vs. Buy Decision

• Calculate your WACC or hurdle rate and use it as the discount rate for NPV analysis
• Project lease costs for the full analysis period including escalations and NNN expenses
• Model ownership costs including mortgage, taxes, insurance, maintenance, and capital reserves
• Compute NPV for both scenarios using the same discount rate and time horizon
• Calculate the IRR on the buy scenario and compare it to your hurdle rate
• Run sensitivity analysis on appreciation rates (0%, 2%, 4%) and interest rates
• Quantify the opportunity cost of the down payment at your business's return rate
• Identify the break-even year and assess whether your holding period exceeds it
• Account for tax differences including depreciation recapture on a future sale
• Evaluate non-financial factors: flexibility needs, management bandwidth, risk tolerance
• Assess industry-specific risks that could change your space requirements
• Have a commercial real estate attorney review lease terms or purchase contracts before committing

Red Flags: When the Analysis Is Misleading

Watch for these warning signs that your lease vs. buy analysis may be leading you to the wrong conclusion:

1. Using a discount rate below your actual cost of capital. This artificially inflates the NPV advantage of buying by undervaluing the time cost of money. A 6% discount rate versus a 10% discount rate can swing the analysis by hundreds of thousands of dollars.
2. Assuming above-market appreciation rates. Projecting 5-6% annual appreciation based on the last few years of a hot market ignores mean reversion. Use long-term averages (2-3%) and stress-test with 0%.
3. Ignoring transaction costs on sale. Broker commissions, transfer taxes, closing costs, and depreciation recapture can consume 8-12% of the sale price. This dramatically reduces your terminal value.
4. Forgetting the capital expenditure reserve. Roofs, HVAC systems, parking lots, and elevators require major capital expenditures every 10-15 years. Budget 1-2% of property value annually, or your ownership costs are understated.
5. Comparing a below-market lease to a fair-value purchase. If your current lease is below market, leasing looks artificially good. Use market-rate rents for a fair comparison.
6. Not accounting for vacancy risk between tenants. If you plan to lease part of the building, even one month of vacancy per year erases a meaningful portion of rental income. Budget for 5-8% vacancy in mixed-use scenarios.

Frequently Asked Questions

Final Thoughts: Numbers First, Then Strategy

The lease vs. buy decision should start with rigorous financial modeling but cannot end there. The NPV and IRR calculations in this guide clearly favor buying under our baseline assumptions: a 10-year hold, 3% appreciation, and 9% discount rate produce an NPV advantage of over $839,000 for purchasing. The IRR of 34.7% far exceeds typical hurdle rates even under pessimistic appreciation scenarios.

However, the right decision for your business depends on factors that don't fit neatly into a spreadsheet. How confident are you in your 10-year space forecast? Can you afford to have $525,000+ tied up in an illiquid asset? Does your industry face disruption that could change your space needs? Do you have the bandwidth to manage property ownership on top of running your business?

The most common mistake we see is businesses making this decision based on monthly payment comparisons alone. A proper analysis requires NPV, IRR, sensitivity testing, opportunity cost evaluation, and break-even calculation. The math is not complicated, but it requires discipline to model honestly, using conservative assumptions and stress-testing the results.

Whichever path you choose, make sure your lease terms are optimized. Even if you decide to buy, you may lease for several years first. And if you decide leasing is the right long-term strategy, the terms of that lease will determine hundreds of thousands of dollars in costs over its life. Understanding exactly what you are signing is not optional; it is the foundation of sound real estate strategy.