How to Read a Commercial Lease Before Signing

Quick Answer

A commercial lease is one of the longest and most consequential contracts most small businesses sign. Unlike residential leases, commercial leases have almost no statutory protections for tenants. The landlord's form is the starting point, and it is written entirely in the landlord's favor.

The most important things to understand before signing:

• the lease structure (gross, net, NNN, modified gross) and what you actually pay
• common area maintenance charges and how they are calculated
• rent escalation clauses and how much your rent can increase each year
• personal guarantee provisions and what they expose you to personally
• exit rights, early termination fees, and what it costs to leave

If you want a fast first read on a commercial lease to flag unusual terms before negotiating, AI contract review can surface the key provisions quickly.

Quick Decision Guide

Review more carefully if the lease:

• is a triple net (NNN) lease with uncapped CAM charges
• includes a personal guarantee with no carve-outs or sunset
• has a rent escalation clause tied to CPI without a ceiling
• gives the landlord broad termination or relocation rights
• includes an exclusivity clause that is narrower than your actual business
• has a co-tenancy clause that lets you exit only under very specific conditions

You are in a more reasonable position when the lease:

• clearly defines what is included in CAM charges and caps annual increases
• limits the personal guarantee to a defined period or amount
• has a clear early termination right with a defined fee
• gives you a right of first refusal on adjacent space
• defines the permitted use broadly enough to cover your actual business

Lease Structure

Understanding what you actually pay starts with the lease type.

Gross lease

You pay a fixed amount each month. The landlord covers property taxes, insurance, and most maintenance costs out of that payment. More predictable for tenants. Less common in commercial real estate.

Net lease

You pay base rent plus some operating expenses. The specific split varies. Single-net: you pay property taxes. Double-net: you pay property taxes and insurance. The landlord still covers maintenance.

Triple net (NNN) lease

You pay base rent plus property taxes, building insurance, and maintenance costs. NNN is common in retail and light industrial. The base rent looks lower than a gross lease, but your total occupancy cost is higher and less predictable.

Modified gross lease

A negotiated hybrid. The split of operating expenses is defined in the lease. Read what is included carefully, because "modified gross" does not mean the same thing in every lease.

Common Area Maintenance Charges

CAM charges are one of the most significant hidden costs in commercial leases. They cover the cost of maintaining shared spaces: hallways, parking lots, lobbies, landscaping, and building systems.

What to check

• What is included: Some landlords include management fees, capital expenditures, and administrative costs in CAM. These are negotiable. Exclude or cap them explicitly.
• The base year: CAM charges are often tied to a base year. You pay increases above the base. A favorable base year limits your exposure to future increases.
• Annual cap: Negotiate a cap on annual CAM increases, typically 3 to 5 percent per year. Without a cap, costs can escalate significantly.
• Audit rights: Most commercial leases allow tenants to audit CAM calculations. Make sure you have this right and that the landlord is required to provide itemized statements.

Rent Escalation

Most commercial leases include annual rent increases. The mechanism determines how much predictability you have.

Fixed percentage increase

Your rent increases by a set percentage each year, typically 2 to 4 percent. Predictable and easy to budget.

CPI escalation

Rent increases based on the Consumer Price Index. The actual increase depends on inflation. Negotiate a floor and ceiling — for example, increases no less than 2 percent and no more than 5 percent annually — to prevent extreme outcomes in either direction.

Stepped rent

Rent is fixed in a schedule that defines the exact amount for each year of the lease. Simple and fully predictable.

Personal Guarantees

Commercial landlords routinely require a personal guarantee from principals of the tenant entity. A personal guarantee makes you personally liable for the lease obligations if the business entity fails to pay.

What to negotiate

• Burn-down provision: The guarantee amount decreases over time as you demonstrate payment history. After two or three years of on-time payments, the guarantee may reduce to the final 12 months of rent rather than the full term.
• Time limit: The personal guarantee expires after a defined period, regardless of payment history.
• Amount cap: The guarantee is limited to a defined dollar amount rather than the full remaining lease obligation.
• Carve-outs: The guarantee does not apply to CAM charges or other variable costs, only to base rent.

Signing a personal guarantee on a long commercial lease without negotiation can expose you to years of rent obligations personally if the business fails. This is worth specific attention before signing.

Early Termination Rights

Most commercial leases do not include a tenant right to exit early. You are typically locked in for the full term unless:

• you negotiate a specific early termination right at the time of signing
• the landlord is in material breach and that breach entitles you to exit
• you can assign the lease to a qualifying successor

What to negotiate

• Termination right with fee: You can exit after a defined period by paying a termination fee, typically the equivalent of several months of base rent plus unamortized landlord costs
• Assignment rights: Broad assignment rights let you transfer the lease to a buyer of your business without landlord consent (or with consent that cannot be unreasonably withheld)
• Subletting rights: If you cannot exit, the ability to sublet part or all of the space limits your exposure

Quick Contract Review Checklist

Before signing a commercial lease, confirm you understand:

• what type of lease it is and what you are responsible for paying
• the exact CAM charge calculation and whether there is an annual cap
• how base rent escalates and whether there is a ceiling on CPI escalation
• what the personal guarantee covers and whether it can be negotiated down
• whether you have any right to exit early and what it costs
• what the permitted use clause covers and whether it is broad enough
• what happens if an anchor tenant leaves or the property is sold

The glossary has plain-English definitions for triple net lease, CAM charges, personal guarantee, and rent escalation.

FAQ

What is the difference between base rent and total occupancy cost?

Base rent is the fixed monthly payment in the lease. Total occupancy cost includes base rent plus CAM charges, property taxes, insurance, and utilities depending on the lease structure. In a NNN lease, total occupancy cost can be 30 to 50 percent higher than base rent alone. Always model total occupancy cost, not just base rent, before comparing spaces.

Can I negotiate a commercial lease or is it take it or leave it?

Commercial leases are almost always negotiable. Landlords expect tenants to counter. The degree of leverage depends on the market, the landlord's occupancy rate, and how much the landlord wants your tenancy. Even in tight markets, provisions like personal guarantee terms, CAM caps, and permitted use definitions are routinely negotiated.

What is a co-tenancy clause?

A co-tenancy clause gives you the right to reduce rent or terminate the lease if a key anchor tenant leaves the property. Common in retail contexts where your foot traffic depends on nearby tenants. If an anchor leaves and your sales drop, a co-tenancy clause provides a contractual exit or rent reduction.

What happens if the building is sold?

Your lease typically follows the building. A new owner takes the property subject to existing leases. Check whether the lease includes a non-disturbance agreement from the landlord's lender, which protects your right to occupy the space even if the landlord defaults on their mortgage.

Can I sublease my commercial space if I no longer need it?

Only if the lease allows it. Most commercial leases require landlord consent to sublet, but "consent shall not be unreasonably withheld" is a standard negotiating point. Without subletting rights, you remain responsible for the full rent even if you vacate the space.

The Bottom Line

A commercial lease locks you in for years and creates financial obligations that follow you personally if you signed a guarantee. The base rent is rarely the full picture. CAM charges, escalation clauses, and personal guarantee exposure are where the real risk sits.

Read the full lease before negotiating anything. Understand what type of lease it is, what your total occupancy cost will be, whether there is an annual cap on operating expense increases, and what the personal guarantee actually commits you to. Every one of these terms is negotiable before signing and almost none of them are after.

Start with AI contract review to flag unusual or one-sided provisions before you begin negotiating, check pricing to see how to fit a review into your process, and browse use cases to see how others approach high-stakes agreements. Related reading: contract red flags checklist and how to renegotiate a contract after signing.