How to Read a Commercial Lease Before You Sign

Key Takeaways

A commercial lease is written by the landlord’s attorney and every default in the document favors the landlord. Reading it carefully before you sign is not optional. 

• Start by confirming the basic business terms match what was agreed in the LOI. Errors in square footage, rent, or lease dates are more common than people expect.
• Base rent is only part of what you will pay. The lease type determines who pays taxes, insurance, and maintenance on top of that. Know which structure you are in before you read anything else.
• Operating expense clauses, personal guarantees, restoration obligations, and assignment rights are where most tenants get hurt. These sections deserve more attention than the rent.
• Every date in the lease carries a consequence. Renewal option windows, TIA deadlines, and holdover terms can all cost you significantly if you miss them.
• A tenant rep reviews the business terms. A commercial real estate attorney reviews the legal language. Both are worth having before you sign a lease that runs five years or more. 

Most business owners read a commercial lease the same way they read an apartment lease. They check the rent, the square footage, and the start date, then sign.

That approach works fine when the stakes are low. A commercial lease is not that. It is a legally binding contract written by the landlord’s attorney, running 30 to 60 pages, and designed to favor the building owner at every default.

Here is how to read it so you know exactly what you are agreeing to.

Why Is a Commercial Lease Different From Other Contracts?

Commercial leases offer far fewer consumer protections than residential ones. There is no standard form, no government oversight of the terms, and no cooling-off period after you sign.

The document in front of you was written by the landlord’s legal team to protect the landlord. That does not mean it is unfair. It means every clause you do not read is a clause that defaults in their favor.

Before reviewing your lease, revisit the terms agreed upon in your commercial real estate letter of intent. Understanding which key business terms should be locked in before drafting begins will help you spot any discrepancies early.

Do the Basic Business Terms Match What You Agreed To?

Before you read anything else, confirm the fundamentals match the LOI. Errors here are more common than people expect, and fixing them after signing is difficult. 

• Tenant and landlord legal names: Are the correct legal entities listed?
• Premises description: Does the address, suite number, and square footage match exactly?
• Lease commencement and expiration dates: Do they align with what was negotiated?
• Base rent and annual escalation rate: Does the number match, and is the escalation rate what you agreed to?
• Lease type: Is it NNN, modified gross, or full service gross?

Example:

A Charlotte business owner signs a lease without checking the square footage. The lease lists 3,200 sq ft. The actual space is 3,000 sq ft. At $28 per sq ft per year, that 200 sq ft discrepancy costs $5,600 annually. Over a 5-year lease, that is $28,000 paid for space that does not exist. It takes five minutes to measure and confirm, but most people skip it.

What Does Your Rent Include?

The lease type determines what is inside your monthly payment and what gets charged on top. This is one of the most important things to confirm before you read any other section. 

• NNN (triple net): You pay base rent plus your share of taxes, insurance, and common area maintenance separately. The base rent looks low but the total cost is higher. 
• Modified gross: Some expenses are included in rent, others are passed through. The split varies by deal. Read exactly what is and is not included.
• Full service gross: All operating costs are rolled into one rent figure. The base rent is higher but there are fewer surprises. 

For a clear breakdown of NNN expense structures, check out What Is a Triple Net Lease?

If you want to see how different lease types impact your bottom line, take a look at our guide to Commercial Real Estate Lease Types.

What Does the Operating Expense Section Say?

In most NNN and modified gross leases, the operating expense section determines how much you pay on top of base rent. This is where most tenants get surprised.

Look for these four things specifically:

• Is there a TICAM cap? A cap limits how much operating expenses can increase year over year, usually 3 to 5 percent. Without one, your costs can rise sharply mid-lease.
• What is included in CAM? Property management fees and administrative overhead are sometimes buried in here. Ask for a line-by-line breakdown before you accept any estimate. 
• Are capital expenses excluded? Major repairs like roof replacement should not be passed through as operating expenses. Make sure they are explicitly excluded. 
• Do you have audit rights? You should have the right to verify the landlord’s actual TICAM expenses each year. If the lease does not include this, push to add it.

Example:

A tenant signs a 5-year NNN lease with no TICAM cap. TICAM starts at $7 per sq ft. In year two it rises 12%. On 3,000 sq ft that is an extra $2,520 per year the tenant did not budget for. Over the remaining four years the gap compounds further. A 3% cap negotiated upfront would have cost nothing and saved thousands.

For a full breakdown of how these costs work and what you can negotiate, check out our guide on TICAM meaning and expense structures.

What Dates in the Lease Could Cost You Money?

Commercial leases are full of dates that carry real consequences if you miss them. Read every one of these carefully:

• Rent commencement vs. lease commencement: These are often different dates. The gap between them is your free rent period. Make sure it is in the lease, not just the LOI. 
• Renewal option notice window: Most renewal options require written notice 6 to 12 months before lease expiration. Miss the window by a day and you lose the option entirely.
• TIA use-by deadline: If your buildout is not complete within the timeframe stated in the lease, unused TIA is forfeited. Make sure your construction timeline fits. 
• Holdover terms: If you stay past the lease expiration without a signed renewal, most leases convert to a month-to-month holdover at 150 percent of the last month’s rent. Know this before the date arrives.

Good to Know: Put every critical lease date into your calendar the day you sign. Set a reminder 14 months before lease expiration so you never miss a renewal window. A missed option is almost always unrecoverable.

Which Clauses Do Most Tenants Skip?

These are the sections that rarely get read and cause the most problems:

• Personal guarantee: This makes you personally liable if your business cannot pay. Check whether it covers the full remaining rent for the entire lease term or whether it is limited.
• Assignment and sublease rights: If you sell your business, you may need to transfer the lease. Some leases give the landlord broad rights to block this. Know what the clause says before you need it.
• Relocation clause: Some leases allow the landlord to move you to a different space in the building. Push to have this removed or limit it to comparable spaces with the landlord covering all moving costs.
• Restoration clause: Some leases require you to return the space to its original condition at your own cost. Confirm what normal wear and tear covers and what it does not.
• SNDA clause: If the landlord’s lender forecloses, an SNDA protects your right to stay in the space. Without one, a new building owner has no obligation to honor your lease.

Not every lease term is set in stone. Check out how to negotiate a commercial lease to see which clauses are negotiable and how to fight for better terms.

What Should You Check in the TIA Work Letter?

The tenant improvement allowance is referenced in the lease body but the details live in the work letter, which is usually an exhibit at the back of the document. Most tenants never read it.

• What costs are eligible for reimbursement
• Who manages the construction and approves contractors
• When and how the landlord reimburses you
• What happens to unused TIA at the end of the buildout period
• The deadline by which all work must be complete

Learn More: What is a tenant improvement allowance?

Who Should Review the Lease Before You Sign?

Two people, not one.

A tenant rep reviews the business terms and confirms they match what was agreed in the LOI. They flag anything that changed between the term sheet and the final document and push back before you are locked in.

Here are more details about what a tenant representative is in commercial real estate.

A commercial real estate attorney reviews the legal language. They catch clauses that create risk, flag provisions that are ambiguous, and confirm the document actually reflects what was negotiated.

Neither one replaces the other. The tenant rep handles the deal. The attorney handles the contract.

The Bottom Line

A commercial lease is not boilerplate. Every clause is in there for a reason, and most of the defaults favor the landlord.

Reading it carefully takes time. Signing it without reading it takes longer to recover from.

Frequently Asked Questions About Reading a Commercial Lease