Skip to main content
CostPrism

Commercial Lease Cost Calculator

Calculate your true total occupancy cost — not just base rent. Model NNN/CAM, escalation, TI allowance, free rent, and compare two lease proposals.

Data: CBRE · JLL · Cushman & Wakefield · BOMA Reviewed by Rachel Goldstein, Business Finance Analyst Updated June 2026

Quick Estimate

Get an instant cost estimate with just a few inputs. For detailed analysis, use the full calculator below.

Blank = market estimate

Quick start:

Property Details

Lease Terms

What If? Scenario Analysis

See how different terms affect your total lease cost. Uses your current calculator inputs as the baseline.

What Is Total Commercial Lease Cost?

Total occupancy cost is the true amount your business pays to occupy a commercial space — not just the advertised base rent. It includes base rent, operating expenses (NNN/CAM/tax/insurance), utilities, parking, buildout costs above your TI allowance, and all other recurring and one-time expenses over the lease term.

For most businesses, total occupancy cost is 20–40% higher than the listed rent. A $28/SF NNN listing may actually cost $38–$45/SF when you add operating expenses, utilities, and amortized buildout costs. This calculator reveals that true number.

How Commercial Lease Costs Are Calculated

Annual Base Rent = Rentable SF x Rate/SF/yr

Monthly Base Rent = Annual Base Rent / 12

Year N Rent = Year (N-1) Rent x (1 + Escalation Rate)

NNN Costs = SF x (Property Tax + Insurance + CAM) per SF/yr

Total Annual Occupancy = Base Rent + NNN + Utilities + Parking + Other

Tenant Buildout Gap = Max(0, Total Buildout - TI Allowance)

Effective Rent = Total Lease Cost / SF / Term Years

Free Rent Savings = Monthly Rent x Free Months

Commercial Lease Types Explained

Lease Type Tenant Pays Common For
Full-Service GrossBase rent onlyClass A office
GrossRent + utilitiesOffice
Modified GrossRent + some expensesOffice, small retail
Single Net (N)Rent + property taxRare
Double Net (NN)Rent + tax + insuranceSome retail
Triple Net (NNN)Rent + tax + insurance + CAMRetail, industrial
Absolute NNNALL expenses incl. structureSingle-tenant retail
Percentage RentRent + % of salesMall/shopping center

NNN Lease: True Cost Breakdown

A "triple net" listing of $20/SF actually costs significantly more. Here is what NNN expenses typically add:

Expense Typical Range Example (2,000 SF)
Property Taxes$2–$6/SF/yr$6,000/yr
Building Insurance$1–$3/SF/yr$3,000/yr
CAM / Maintenance$3–$10/SF/yr$10,000/yr
Total NNN Add-On$7–$19/SF/yr$19,000/yr

Ranges based on BOMA Experience Exchange Report 2025 and CBRE market data. Actual costs vary by building class, location, and property condition.

Commercial Lease Rates by Property Type (2026 Market Estimates)

Property Type Base Rate (/SF/yr) NNN Typical
Class A Office $55/SF +$14/SF
Class B/C Office $28/SF +$10/SF
Retail (Prime) $40/SF +$12/SF
Retail (Secondary) $22/SF +$8/SF
Restaurant $28/SF +$10/SF
Medical Office $32/SF +$12/SF
Warehouse / Distribution $10/SF +$4/SF
Industrial / Flex $12/SF +$5/SF
Flex Space $16/SF +$6/SF
Showroom $20/SF +$7/SF
Mixed Use $25/SF +$9/SF

Base rates represent suburban/mid-size city market estimates. Multiply by market tier factor for Tier 1 (2.2x) or major metro (1.5x). Sources: CBRE Q2 2026, JLL, Cushman & Wakefield.

Hidden Costs in Commercial Leases

Rent Escalation

Most leases include 3–4% annual increases. A $5,000/mo lease becomes $5,800/mo by Year 5.

Security Deposit

Typically 2–3 months rent. For a $5,000/mo space: $10,000–$15,000 tied up.

Buildout Above TI

Average office buildout costs $80–$150/SF. With $40/SF TI on 2,000 SF, tenant gap is $80,000–$220,000.

Parking

Urban Class A buildings charge $100–$400/space/month. 5 spaces = $500–$2,000/mo extra.

Common Area Factor

You pay rent on "rentable" SF (10–20% more than usable). A 1,500 usable SF office may be 1,725 rentable SF.

HVAC Maintenance

NNN tenants often maintain HVAC systems: $500–$2,000/yr in servicing costs.

5 Common Commercial Lease Mistakes

Mistake: Comparing base rent without considering NNN

A $28/SF NNN lease often costs more than a $40/SF gross lease once you add $10–$15/SF in operating expenses. Always compare effective rent (total cost / SF / years) — not base rent.

Mistake: Ignoring rent escalation over the term

3% annual escalation adds 15% to your total cost over a 5-year term and 34% over 10 years. Model escalation with a year-by-year schedule before signing.

Mistake: Confusing usable vs. rentable square footage

You pay rent on rentable SF, which includes your pro-rata share of common areas (lobbies, hallways). Rentable SF is typically 10–20% more than usable SF. A "1,500 SF" office may only have 1,275 usable SF.

Mistake: Underestimating buildout costs above TI

Average office buildout costs $80–$150/SF. If your landlord offers $40/SF TI on 2,000 SF, your tenant gap could be $80,000–$220,000 out of pocket. Negotiate TI before rent.

Mistake: Not negotiating when vacancy is high

In 2026, national office vacancy is 18–22%. This gives tenants strong leverage. Push for 3–6 months free rent, higher TI, 10–20% rent reduction, and NNN escalation caps.

Example Commercial Lease Calculations

These examples show real cost analysis for common scenarios. Click any example to load it into the calculator above.

Commercial Lease Cost by State

Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming

Find Commercial Space

Search 500,000+ commercial listings for sale and lease on LoopNet.

Search on LoopNet

Explore on Crexi

Find office, retail, industrial, and warehouse space on Crexi.

Browse Crexi

Disclosure: Links to third-party commercial real estate platforms are provided for user convenience. CostPrism may receive compensation if you engage with these services. This does not affect our calculator results or recommendations.

Related Business Calculators

Startup Cost Calculator Employee Cost Calculator Payroll Cost Calculator Business Insurance Cost LLC Formation Cost Bookkeeping Cost Break-Even Calculator Profit Margin Calculator Moving Cost Calculator

Frequently Asked Questions

How do you calculate commercial rent per square foot?
Multiply the annual rent per square foot by the total rentable square footage to get annual rent, then divide by 12 for monthly rent. Example: $30/SF/yr on 2,000 SF = $60,000/yr = $5,000/mo. For NNN leases, add operating expenses ($7–$15/SF/yr) to base rent for total occupancy cost.
What is a triple net (NNN) lease?
In a NNN lease, the tenant pays base rent plus three "nets": property taxes, building insurance, and common area maintenance (CAM). These typically add $7–$15/SF/yr above base rent. NNN leases are most common for retail and industrial properties. Always ask for the gross-equivalent rent to compare with other lease types.
What is effective rent and why does it matter?
Effective rent is your true cost per square foot per year after accounting for all concessions (free rent, TI allowance) and additional costs (NNN, buildout gap, parking). It allows apples-to-apples comparison between leases with different structures and concessions.
What is CAM and how is it calculated?
CAM (Common Area Maintenance) covers shared building expenses: lobbies, hallways, parking lots, landscaping, elevators, and security. CAM is calculated as your pro-rata share (your SF / total building SF) of these expenses. CAM charges typically range from $3–$10/SF/yr for office and $4–$8/SF/yr for retail.
What is a tenant improvement (TI) allowance?
A TI allowance is money the landlord provides to customize the space. It typically ranges from $20–$60/SF in suburban markets and $40–$100/SF in major cities. The "buildout gap" is any cost above the TI allowance that the tenant pays out of pocket. TI allowance is one of the most negotiable lease terms.
How does rent escalation work in commercial leases?
Most commercial leases include annual rent increases of 2–4%. A $30/SF lease with 3% escalation becomes $30.90 in Year 2, $31.83 in Year 3, and $34.78 by Year 5. Over a 5-year term, 3% escalation adds approximately 15% to your total lease cost compared to a flat rate.
How do I compare two commercial lease offers?
Compare leases using effective rent (total cost / SF / years) rather than base rent alone. A lease with lower base rent but higher NNN, less TI allowance, or steeper escalation may cost more overall. Use our lease comparison tool to analyze two proposals side by side.
What is the difference between gross and NNN lease?
Gross lease: rent includes all operating expenses — simpler but typically higher base rent. NNN lease: lower base rent but tenant pays property taxes, insurance, and CAM separately. Modified gross splits expenses between landlord and tenant. Total occupancy cost is often similar; the structure determines cash flow predictability.
How much commercial space do I need per employee?
Current 2026 benchmarks: traditional office 200–300 SF/person, open plan 120–180 SF/person, hybrid workplace 80–120 SF/person, medical office 250–400 SF per exam room. For hybrid teams with 3-day in-office policies, space needs drop 40–60% versus traditional layouts.
What additional costs should I budget beyond rent?
Beyond base rent, budget for: security deposit (1–3 months rent), buildout costs above TI allowance, parking ($0–$300/space/month), utilities ($2–$5/SF/yr), internet, moving costs, furniture, signage, and legal review ($500–$2,000). Total occupancy cost often exceeds base rent by 20–40%.
How much does commercial office space cost per month in 2026?
A 1,500 SF office in a suburban market costs $2,500–$4,500/mo. In a major metro (Class B), the same space costs $4,000–$7,500/mo. Tier 1 cities (NYC, SF): $7,000–$15,000/mo. These are base rent figures — add 15–35% for NNN, utilities, and parking for true monthly occupancy cost.
What commercial lease terms should I negotiate in 2026?
In 2026, office vacancy remains elevated (18–22% nationally), giving tenants leverage. Key negotiation points: 3–6 months free rent, higher TI allowance ($40–$80/SF achievable), 10–20% rent reduction, 3-year lease terms (vs. traditional 5-year), cap on NNN escalation (5%/yr), and sublease rights. A tenant broker (paid by landlord) typically saves 10–20%.
Are commercial leases quoted per month or per year?
In the US, commercial leases are almost always quoted per square foot per year ($/SF/yr). A "$28 NNN" listing means $28/SF/yr base rent plus NNN expenses. Monthly rent = ($/SF/yr x total SF) / 12. Some residential-style listings (especially small retail) quote flat monthly rent instead.
What is rentable vs usable square footage?
Usable SF is your actual space. Rentable SF includes your pro-rata share of common areas (lobbies, hallways, restrooms). The difference is the "load factor" or "common area factor," typically 10–20% for office buildings. You pay rent on rentable SF, not usable SF. A 1,500 usable SF office might be 1,725 rentable SF at a 15% load factor.

Methodology & Data Sources

This calculator uses market estimates compiled from CBRE U.S. Real Estate Market Outlook (Q2 2026), JLL U.S. Office Statistics (Q1 2026), Cushman & Wakefield MarketBeat Reports, BOMA Experience Exchange Report 2025, and Bureau of Labor Statistics CPI data. Base rates represent mid-size city/suburban market estimates for each property type.

All calculations are deterministic and use the formulas documented in the "How Commercial Lease Costs Are Calculated" section above. Escalation is applied annually. NNN/operating expenses escalate independently from base rent at a configurable rate (defaults to the base escalation rate). Utility costs inflate at 3% annually. Effective rent includes all concessions and one-time costs. NPV uses monthly discounting.

Market rate data is provided as planning estimates, not exact quotes. Actual commercial lease rates depend on building class, specific location, market conditions, lease negotiations, and property condition. Always verify rates with a licensed commercial real estate broker.

Calculator version: 2026.1 · Last updated: June 2026 · CostPrism.com

Disclaimer: This calculator provides estimates for planning purposes only. It does not constitute financial, legal, or real estate advice. Commercial lease terms are complex and vary significantly by market, property, and negotiation. Before signing a commercial lease, consult with a qualified commercial real estate attorney and a licensed tenant representative broker. CostPrism is not a real estate brokerage and does not provide lease recommendations.