Commercial Lease Review: The Terms Small Business Owners Should Understand Before Signing

A commercial lease review is the step where a small business owner reads, clause by clause, the contract that will likely be one of the largest fixed costs of the business for years. Unlike an apartment lease, a storefront, office or warehouse lease is usually drafted by the landlord's side, runs for a multi-year term, and can include costs that do not appear in the headline rent: shared operating expenses, property taxes, insurance, repairs, and a personal guaranty that reaches past the company to its owner.

This guide explains, in plain English, the terms that typically matter most in a commercial lease review, how they work, what landlords and tenants commonly ask for, and where state law adds its own rules. It is written for founders, restaurant and retail owners, consultants opening a first office, real estate investors, and the agents who help them. It is legal information, not legal advice. It is not a substitute for the advice of an attorney; for advice on any contract, routine or not, talk to a lawyer.

If you already have the draft in hand, you can upload it to Justee's commercial lease review page for a first pass while you read. Justee is an AI tool that helps people understand their legal documents: it reads the lease, flags clauses worth a closer look, and explains them in plain language. For an apartment or house lease, see the separate AI lease agreement review guide.

Why a commercial lease review is different from a residential one

Most people's first lease is for an apartment, and residential tenancies come with a layer of consumer protection written into state statutes: rules on security deposits, habitability, notice before entry and eviction procedure. In many states, much of that protection does not extend to commercial premises. Courts and legislatures tend to treat a business tenant and a landlord as two commercial parties who can bargain for themselves, so the written lease usually controls. The Legal Information Institute's overview of landlord-tenant law describes how much of this area is set by state law, which is why the same clause can be read differently in Texas, New York or California.

Three practical differences shape a commercial lease review:

• The landlord's form is the starting point. Commercial leases are commonly drafted by the landlord or its broker, and the first draft tends to favor the landlord. Many terms are open to discussion, and tenants often ask for changes at the letter-of-intent stage and again when the full draft arrives.
• The cost is more than the rent. Depending on the structure, the tenant may also pay a share of property taxes, building insurance and common area maintenance, plus repairs to systems such as heating and air conditioning.
• The commitment is long. Office and retail leases often run for several years, and a personal guaranty can make the owner responsible for that whole commitment.

The U.S. Small Business Administration's guide to choosing a business location treats lease terms alongside zoning, costs and accessibility as part of the location decision. That is a useful frame: the lease is part of the business plan, not paperwork that comes after it. A careful commercial lease review is where the plan meets the contract.

The rest of this guide walks through the clauses that typically carry the most cost or risk. For a broader look at how AI tools read real estate paperwork, including purchase agreements, see AI real estate contract review.

Rent structure: gross, modified gross and triple net leases

The headline rent in a commercial lease is the base rent, usually quoted per square foot per year or as a monthly amount. What the base rent covers depends on the lease structure, and the labels are not standardized, so a commercial lease review looks at the actual wording rather than the name on the cover page.

• Gross lease (sometimes called full service). The landlord pays the building's operating costs, such as taxes, insurance and maintenance, out of the rent. Many gross leases still pass through increases in those costs above a base year.
• Modified gross lease. Costs are split. The tenant may pay its own utilities and janitorial services, or its share of increases in operating costs above a base year, while the landlord covers the rest.
• Triple net (NNN) lease. The tenant pays base rent plus its share of the three nets: property taxes, building insurance and common area maintenance. Some net leases also shift structural repairs to the tenant.

Common area maintenance (CAM) charges

CAM charges cover the shared parts of a property: parking lots, lobbies, landscaping, security, snow removal and property management. They are usually billed monthly as an estimate and then reconciled after year end, which can produce an additional bill. Points tenants commonly look at include what counts as an operating expense, whether capital improvements and the landlord's management fee are included, how the tenant's pro rata share is calculated, whether controllable expenses are capped, and whether the lease gives the tenant a right to review or audit the landlord's records.

State law can matter here too. California's SB 1103, effective January 1, 2025, added protections for certain small qualified commercial tenants, including rules on how building operating costs may be passed through to them. Whether a particular business qualifies, and what the rules require, is a question for a lawyer who knows the current text.

Rent escalations

Most multi-year leases increase rent over time. A fixed escalation raises rent by a stated amount or percentage on each anniversary. An index-based escalation ties the increase to an inflation measure, most often the Consumer Price Index published by the U.S. Bureau of Labor Statistics. Index clauses differ in which CPI series they use, the base month, and whether there is a floor or a ceiling on the increase, so the same CPI escalator label can produce very different numbers.

In a commercial lease review, Justee flags rent, CAM and escalation clauses and explains them in plain language; the same engine powers the general lease agreement review. Reading those three clauses together is often where the real cost of the space becomes clear.

The personal guaranty: who is responsible if the business cannot pay

Many small business owners sign a lease through an LLC or corporation and assume the entity's limited liability keeps their personal assets out of reach. A personal guaranty changes that. A guaranty is a promise by a third party, here usually the owner, to pay the tenant's obligations if the tenant does not. Landlords frequently ask for one from newer businesses or businesses without a long credit history.

Guaranties vary widely, and a commercial lease review looks closely at the scope:

• Full or unlimited guaranty. The guarantor may be responsible for all rent and other charges for the entire remaining term, plus costs such as the landlord's legal fees.
• Limited or capped guaranty. Liability is limited to a stated amount or to a set number of months of rent.
• Burn-off guaranty. The guaranty shrinks or ends after the tenant has paid on time for a stated period.
• Good guy guaranty. Common in some markets, it typically limits the guarantor's liability to rent through the date the tenant gives notice, vacates and returns the premises in the condition the lease requires.

Points business owners commonly ask about include whether the guaranty survives an assignment of the lease, whether it covers renewal terms, and whether a spouse is asked to sign. Because a guaranty reaches personal assets, owners often take it to a lawyer together with the rest of the lease.

Justee flags a personal guaranty as a term to understand before signing and explains in plain language what it asks the owner to promise; whether it fits your situation is a question for you and your lawyer.

Term, renewal, assignment and subletting

The term sets how long the business is committed, and the exit options decide how flexible that commitment is. A commercial lease review typically covers four related groups of clauses.

Commencement and the rent start date

The lease may begin on signing, on delivery of the premises, or when the tenant opens for business. If the landlord is building out the space, a work letter describes the improvements, who pays for them and what happens if they are late. Many tenants ask for a period of free or reduced rent while they fit out the space; whether that is offered depends on the market and the deal.

Renewal options

An option to renew lets the tenant extend for an additional term, usually by giving written notice within a narrow window before the lease ends. Missing that window can end the option. The renewal rent may be fixed, tied to an index, or set at fair market value with a process for resolving disagreements.

Assignment and subletting

If the business is sold, relocates or needs less space, the ability to sublease or assign the lease matters. Many leases require the landlord's consent; some say consent may not be unreasonably withheld, others leave it to the landlord's discretion, and some treat a sale of the company or a change in ownership as an assignment. Recapture clauses can let the landlord take the space back instead of approving a transfer, and profit-sharing clauses can give the landlord part of any sublease rent above the lease rent.

Holdover and early termination

A holdover clause sets the rent if the tenant stays after the lease ends, often at a premium over the last rent paid. Early termination rights, where they exist, usually come with notice requirements and a termination fee.

When the landlord sends a revised draft, Justee Document Comparison lists every insertion, deletion, replacement and visual change between versions, so a quietly changed renewal window or consent standard is easier to spot.

Repairs, insurance, indemnity and ADA responsibility

This group of clauses decides who pays when something breaks, someone is hurt, or the premises need to be brought up to code.

Repairs and replacements

Leases distinguish between routine maintenance and the repair or replacement of major systems: roof, structure, heating, ventilation and air conditioning (HVAC), plumbing and electrical. In many net leases the tenant maintains the systems serving its space, and some leases also make the tenant pay to replace an HVAC unit at the end of its life. Common tenant requests include delivery of building systems in good working order and a cap, or an amortized share, on capital replacements.

Insurance and indemnity

The lease usually requires the tenant to carry commercial general liability insurance and property insurance on its own contents and improvements, at stated limits, with the landlord named as an additional insured. A mutual waiver of subrogation, where it appears, generally means each side's insurer cannot pursue the other side for an insured loss. An indemnity clause shifts the cost of certain claims from one party to the other. Some are one-way, covering only the landlord; others are mutual and tied to each party's negligence. The guide to the limitation of liability clause explains how caps and exclusions interact with indemnities.

If the property sits in a flood zone, insurance obligations may need to account for it; FEMA's Flood Map Service Center lets anyone look up the flood designation for an address.

ADA and building code compliance

For businesses open to the public, accessibility is a shared legal issue. Under the Americans with Disabilities Act regulations at 28 CFR 36.201, both the landlord who owns a building housing a place of public accommodation and the tenant who operates it are subject to Title III, and as between the two of them, the lease may allocate responsibility for compliance. The Department of Justice's ADA Title III overview explains the basics. In California, Civil Code section 1938 requires a commercial landlord to state in the lease whether the premises have been inspected by a Certified Access Specialist.

Use clauses, exclusives, relocation and the landlord's lender

Several clauses that look like boilerplate can decide whether the business can operate as planned.

• Permitted use. A narrow use clause, such as retail sale of women's clothing, can block a later pivot, an added service line, or a sale to a buyer in a different line of business. Zoning is separate from the lease: a use the lease allows may still need local approval.
• Exclusive use. In a shopping center, a tenant may ask for the right to be the only business of its type, and the lease may list exclusives already granted to other tenants that limit what this tenant can sell.
• Co-tenancy. Some retail leases reduce rent or allow termination if an anchor tenant leaves.
• Relocation. A relocation clause can let the landlord move the tenant to other space in the property. Common tenant requests include comparable space, moving costs paid by the landlord, and advance notice.
• Radius restrictions. These limit opening another location within a stated distance.
• Signage, hours and access. Rules on signs, operating hours and after-hours HVAC can carry costs of their own.

Subordination, non-disturbance and attornment (SNDA)

Most commercial leases are subordinate to the landlord's mortgage. If the lender forecloses, a subordinate lease could in some circumstances be cut off. A subordination, non-disturbance and attornment agreement addresses this: the tenant agrees the lease is subordinate and that it will recognize a new owner, and the lender agrees not to disturb the tenant's possession while the tenant is not in default. Tenants that invest heavily in build-out often ask whether an SNDA will be provided.

Default and remedies

Default clauses list what counts as a breach, any notice and cure periods, and what the landlord can do: terminate, recover future rent, keep the security deposit, or in some states assert a lien on the tenant's property. Some remedies may be unenforceable in some states; whether a particular remedy is enforceable against you is a question for a lawyer.

In Justee, findings are rated Critical, Moderate or Note, so the lease terms that may carry the most risk appear first and routine terms do not bury them.

How an AI-assisted commercial lease review works in Justee

AI-assisted review does not decide whether a lease is a good deal. It is a quick way to get oriented before you read the lease closely and before you talk to a lawyer. A Justee commercial lease review is designed to flag and explain clauses, not to approve the deal. Here is how it works, based on the product's documented features.

1. Upload the lease. According to Justee, a review accepts a PDF or DOCX file, including scanned PDFs, or pasted text, and typically takes 1 to 6 minutes.
2. Choose the state. Any U.S. state can be selected. Justee checks the lease against a reference library of over 1 million sections of U.S. and England & Wales legislation. The free trial covers 1 jurisdiction per document; paid plans allow up to 2.
3. Read the findings. According to Justee, findings are rated Critical, Moderate or Note, each with a plain-language explanation.
4. Ask follow-up questions. Justee Legal AI Chat answers general questions about a clause, such as what a CAM reconciliation means, and every edit it proposes lands as a tracked change you can accept or reject.
5. Compare revised drafts. When a new version arrives, Document Comparison lists changes by type. According to Justee, the comparison is rule-based, does not use AI, and does not explain what a change means.
6. Talk to a lawyer. The review is information to bring to that conversation.

Privacy for business documents

A commercial lease names the business, its owners and often a guarantor's home address. Personal and business identifiers are automatically redacted before document text reaches an AI model (best-effort), which reduces how much personal data reaches the model. Documents are processed on Justee's servers, hosted on AWS, and encrypted in transit (TLS 1.2+) and at rest (AES-256). According to Justee, guest files are deleted after 24 hours, and reviews in an account are kept until the user deletes them. On paid plans, optional Full Private Mode seals the result with a key only the user holds; it covers only the items made with it on. To remove names before sharing a lease elsewhere, the Justee PII Redaction Tool accepts PDF and DOCX files. More detail is on the privacy FAQ.

Free use has page, state and usage limits; paid plans run from $16/month to $149/month, billed annually (monthly billing costs more). See pricing for current plans. Investors with several properties may also find the real estate investor contract review page useful, and the property management agreement review page covers the contract between an owner and a manager.

The strength of a Justee commercial lease review is orientation: it puts the guaranty, the CAM language and the renewal window in front of you in plain English, so the conversation with a lawyer can start from specific clauses rather than a blank page.

A commercial lease review comes down to two questions: what will this space really cost over the full term, and who carries the risk when something goes wrong. The answers sit in the rent structure, the CAM definitions, the guaranty, the transfer clauses, and the repair and insurance terms. An AI-assisted first pass with Justee's contract review can surface those clauses and explain them in plain language, so you can understand the terms before you sign. It is not a substitute for the advice of an attorney; for advice on any contract, routine or not, talk to a lawyer. The American Bar Association's Real Property, Trust and Estate Law Section is one place to learn more about real estate law practice.

Max Zaykov is the founder of Justee.ai, an AI tool that helps people understand their legal documents.

Justee is not a law firm. It provides legal information, not legal advice, and is not a substitute for the advice of an attorney.