How to Read a Commercial Lease: Key Clauses Every Tenant Should Understand

A commercial lease is not a residential lease with bigger numbers. It is a heavily negotiated business contract that allocates risk, cost, and obligation between landlord and tenant for 3 to 15 years. In Massachusetts, commercial tenants have almost none of the statutory protections that residential tenants enjoy - no implied warranty of habitability, no rent control, no 30-day cure periods unless the lease specifically grants them. Every protection you have comes from the lease document itself.

The difference between a well-reviewed lease and a hastily signed one can be tens of thousands of dollars and years of operational headaches. This guide walks through the critical sections of a commercial lease in the order they typically appear, with the red flags and negotiation points that matter most.

Section-by-Section Guide

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Step 1: Read the premises description and confirm the rentable square footage. Verify that the space described matches the space you toured. Check whether the landlord uses BOMA measurement standards, which include a load factor (common area allocation) that increases rentable SF above usable SF by 10-20%. A 2,000 usable SF suite measured at 2,300 rentable SF increases your effective rent by 15%.

Step 2: Analyze the rent structure and escalation schedule. Identify the base rent, when it begins (the commencement date may differ from the date you take possession), annual escalation percentages or CPI adjustments, and any free rent or abatement periods. Calculate total rent over the full lease term, not just year one.

Step 3: Examine operating expense and CAM provisions. Determine which expenses are passed through, whether there is a base year or expense stop, whether CAM charges are capped, and what the reconciliation process looks like. Request three years of historical operating expense statements.

Step 4: Review maintenance and repair obligations. Identify exactly what the tenant is responsible for maintaining versus the landlord. In NNN leases, roof, structure, and HVAC responsibility can be ambiguous - get explicit language on who pays for capital replacements versus routine maintenance.

Step 5: Evaluate assignment, sublease, and early termination provisions. Understand your options if your business needs change. Look for landlord consent requirements, recapture rights, and whether assignment releases you from the personal guarantee.

Step 6: Scrutinize the default and remedies section. Know your cure periods (how many days you have to fix a default before the landlord can act), what constitutes a monetary versus non-monetary default, and what remedies the landlord has - including whether they can accelerate the remaining rent for the full lease term.

Step 7: Assess the personal guarantee and security deposit. Determine the scope and duration of any personal guarantee, whether it burns off over time, and whether the security deposit can be applied to the last month's rent or is held as additional collateral.

Step 8: Have a commercial real estate attorney review the final document. Attorney review typically costs $1,500-$5,000 for a standard commercial lease - a fraction of the exposure in a 5-year, $100,000+/year commitment. Do not skip this step.

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Premises and Measurement

The premises clause defines the exact space you are leasing, including suite number, floor, and square footage. Two critical issues arise here.

Rentable vs. usable square footage. Most commercial leases quote rentable SF, which includes a proportionate share of common areas (lobbies, corridors, restrooms, mechanical rooms). The Building Owners and Managers Association (BOMA) standard allows load factors of 10-20% above usable SF. On a 3,000 usable SF suite with a 15% load factor, you pay rent on 3,450 SF. Over a 5-year lease at $20/SF, that load factor costs an additional $45,000.

Right to verify. Negotiate the right to independently measure the premises within 60-90 days of lease execution. If the actual square footage differs by more than 2%, rent should adjust proportionally. Landlords who resist this clause may be quoting inflated measurements.

Rent, Escalations, and Commencement

The rent section specifies base rent, the commencement date, and the escalation schedule. Watch for these issues.

Commencement date triggers. The lease may define commencement as the date of execution, the date the landlord delivers the space, or a fixed calendar date. If you are performing a build-out, negotiate a commencement date tied to substantial completion of tenant improvements - not the date the landlord hands you the keys to a raw shell.

Escalation structures. Fixed annual increases of 2-3% are predictable and budgetable. CPI-tied escalations introduce uncertainty - CPI in the Boston metro area increased 4.7% in 2023 and 3.2% in 2024. Over a 7-year term, the difference between a 2.5% fixed escalation and a CPI-tied escalation can exceed $15,000 on a 3,000 SF space.

Free rent and abatement. In the current Worcester office market, tenants leasing 2,000+ SF on terms of 5+ years can often negotiate 2-4 months of free rent. This concession does not reduce the landlord's reported rental rate, which is why landlords prefer it to base rent reductions. Make sure free rent applies to base rent and NNN charges - some landlords grant base rent abatement while still charging full NNN during the free period.

Operating Expenses and CAM

This is where most tenants lose money. The operating expense section determines what costs flow through to you beyond base rent.

What is included. Standard NNN pass-throughs include property taxes, property insurance, and common area maintenance. But the definition of CAM varies wildly between leases. Some landlords include capital improvements, management fees (typically 3-5% of gross revenue), administrative charges (up to 15% on top of actual CAM), and even legal and accounting fees in the CAM definition.

Expense caps. Negotiate an annual cap on CAM increases - 3-5% per year is reasonable and protects you from surprise reconciliation bills. Without a cap, a landlord who re-paves a parking lot or replaces a roof can pass the cost through to tenants in a single year. In older Worcester buildings, annual CAM increases of 8-15% without caps are documented.

Capital expense exclusions. Insist that capital expenditures (roof replacement, structural repairs, HVAC system replacement) are excluded from operating expenses or amortized over their useful life (typically 10-15 years) so you pay only your proportionate share during your lease term.

Audit rights. The right to audit the landlord's operating expense books annually is standard but not always included. Negotiate it. National studies suggest that 50-60% of commercial CAM reconciliations contain errors - typically in the landlord's favor.

Maintenance and Repair Obligations

In a NNN lease, the tenant bears most maintenance responsibility. But the line between "maintenance" (tenant's obligation) and "capital replacement" (typically landlord's obligation) is often blurred.

HVAC. The most common dispute area. Many leases require tenants to maintain HVAC systems and pay for repairs, but leave ambiguous who pays when a 20-year-old rooftop unit needs full replacement - a $15,000-$40,000 expense. Negotiate clear dollar thresholds: tenant pays for repairs under $2,500 per occurrence; landlord pays for replacements or repairs exceeding that amount, amortized over the useful life.

Roof and structure. In standard NNN leases, the landlord retains responsibility for structural elements (foundation, load-bearing walls, roof structure). The tenant is responsible for the roof membrane and interior ceiling. Get this in writing - "roof" without qualification is ambiguous.

Assignment, Sublease, and Exit Options

Your exit strategy is defined at signing. If your business outgrows the space, downsizes, or closes, your ability to assign the lease or sublease the space depends entirely on these clauses.

Consent standards. "Landlord shall not unreasonably withhold consent" is the gold standard for tenants. "Landlord may withhold consent in its sole discretion" gives the landlord veto power with no recourse. In Massachusetts, courts generally do not imply a reasonableness standard in commercial leases - if the lease says "sole discretion," the landlord can refuse for any reason.

Recapture rights. Some leases allow the landlord to recapture (take back) the space if the tenant requests to assign or sublease. This means the act of trying to sublease can result in losing the space entirely. Negotiate to remove recapture rights or limit them to assignments only.

Continued liability. In most commercial leases, the original tenant remains liable for rent even after an assignment unless the landlord agrees to a release. A personal guarantee that survives assignment means your credit is on the hook for a space you no longer occupy.

For a broader discussion of lease negotiation strategies, see: A Tenant's Guide to Negotiating Your Commercial Lease.

Default, Remedies, and Cure Periods

The default section defines what triggers a breach and what the landlord can do about it.

Monetary default. Late or missed rent payments. Negotiate a cure period of at least 5-10 business days with written notice before the landlord can declare a default. Without a cure period, a single late payment - even due to a bank processing error - constitutes a default.

Non-monetary default. Violations of lease terms: unapproved alterations, prohibited uses, failure to maintain insurance. Cure periods of 30 days for non-monetary defaults are standard; for defaults that cannot be cured within 30 days, negotiate language allowing additional time provided you have commenced curing and are diligently pursuing completion.

Rent acceleration. The most punitive remedy. Some leases allow the landlord to demand all remaining rent for the full lease term upon default. On a 5-year lease at $5,000/month with 3 years remaining, that is $180,000 due immediately. Negotiate to cap accelerated rent at 6-12 months or require the landlord to mitigate damages by making reasonable efforts to re-let the space.

Personal Guarantee

Many landlords require the business owner to personally guarantee the lease, making you individually liable if the business entity defaults. This is standard for small businesses and startups, but the scope and duration are negotiable.

Burn-off provisions. Negotiate a guarantee that reduces over time - for example, full guarantee for years 1-2, reducing to 50% for years 3-4, and eliminated for years 5+. Tie the burn-off to on-time rent payment history.

Cap the guarantee. Instead of guaranteeing the entire remaining lease obligation, cap the personal guarantee at 12-24 months of rent plus estimated expenses. This limits your personal exposure while still giving the landlord meaningful security.

Spousal guarantee. In Massachusetts, a landlord cannot require a spousal guarantee unless the spouse is an owner of the tenant entity. Push back firmly on any request for a spouse's personal guarantee.

Red Flags That Require Immediate Attention

• No cap on CAM or operating expense increases - you are writing a blank check
• Landlord consent "in sole discretion" for assignment or sublease - you have no exit
• Rent acceleration for full remaining term with no mitigation obligation
• Personal guarantee that survives assignment - you remain liable even after leaving
• Commencement date not tied to TI completion - you pay rent on an unusable space
• No right to audit operating expenses - you cannot verify what you are being charged
• Relocation clause - landlord can move you to a different suite at their discretion
• Continuous operation clause without dark store protection - you must remain open even if unprofitable

When to Hire Help

A commercial lease is a six- or seven-figure financial commitment. The cost of professional review is negligible by comparison.

Tenant rep broker (free to tenant). A commercial real estate broker representing the tenant can help you evaluate competing spaces, negotiate lease terms, and identify clauses that need modification. In most commercial transactions, the landlord pays both the landlord's and tenant's broker commissions, so tenant representation costs you nothing.

Real estate attorney ($1,500-$5,000). An attorney who specializes in commercial leases will review every clause, flag risks, and negotiate modifications to the landlord's form. For a lease with a total commitment exceeding $100,000, this is essential.

Lornell Real Estate provides tenant representation across Worcester County and Central Massachusetts. We review lease terms, negotiate on your behalf, and ensure you understand every clause before you sign. Call (774) 745-0015 or email [email protected].

Sources & References

• Building Owners and Managers Association (BOMA)
• Massachusetts General Laws Chapter 186 (landlord-tenant)
• Cushman & Wakefield (tenant improvement and concession benchmarks)
• Lornell Real Estate transaction and negotiation data

This article cites data from the sources listed above. For the most current figures, consult the original publications directly.

Data current as of publication date. Market conditions, rates, and regulations may have changed. Consult a qualified commercial real estate professional before making investment decisions.