A Practical Guide for Industrial and Commercial Tenants

Understanding Your Lease Starts Here

A commercial lease is one of the most significant commitments your business will make. Unlike a residential lease, a commercial lease is largely negotiable, often complex, and can have major financial implications for years to come. Yet many tenants sign on the dotted line without fully understanding what they’ve agreed to.

This guide breaks down the key terms you’ll encounter, explains the difference between lease structures, and outlines your rights and responsibilities as a tenant — so you can make informed decisions and avoid costly surprises.

Section 1: Key Lease Terms Explained

Commercial leases come loaded with terminology that can feel overwhelming. Here are the terms you’re most likely to encounter and what they actually mean for your business.

Base Rent

This is the fixed monthly amount you pay for occupying the space. In most lease structures, base rent is stated per square foot per month (e.g., $1.50 PSF/month). On a 5,000 SF space at $1.50 PSF/month, your monthly base rent would be $7,500.

Lease Term

The length of your lease commitment. Industrial and commercial leases typically run 3–7 years. Longer terms often come with more favorable rates or landlord concessions (like free rent or tenant improvement allowances), but they also lock you in for an extended period.

Commencement Date vs. Rent Commencement Date

The commencement date is when your lease legally begins — often the day you take possession of the space. The rent commencement date is when you start paying rent, which may be later if you’ve negotiated a free-rent period for buildout or setup.

Tenant Improvement Allowance (TI)

An amount the landlord agrees to contribute toward improvements to the space. This might cover things like flooring, lighting, HVAC upgrades, or office buildout. TI is typically expressed as a dollar amount per square foot (e.g., $15 PSF). Be clear on what’s included and who manages the construction process.

Operating Expenses (OpEx)

Costs associated with running and maintaining the property, which may be passed through to tenants depending on your lease structure. These can include property taxes, insurance, landscaping, parking lot maintenance, and common area upkeep. Understanding what’s included in your operating expenses is critical before you sign.

CAM — Common Area Maintenance

CAM charges cover the cost of maintaining shared spaces — lobbies, parking lots, landscaping, exterior lighting, and similar areas. In multi-tenant properties, these costs are allocated proportionally based on each tenant’s share of the total building square footage (your “pro-rata share”).

Personal Guarantee

A clause that makes you personally liable for the lease obligations if your business cannot pay. Landlords often require this for newer businesses or smaller tenants. Understand the full scope of your exposure before agreeing to a personal guarantee.

Holdover Clause

If your lease expires and you stay in the space without signing a renewal, you’re “holding over.” Most leases specify that holdover rent is charged at a significantly higher rate — often 125–150% of your previous base rent. Plan your exit or renewal well in advance.

Section 2: Understanding NNN vs. Gross Leases

One of the most important questions to ask about any commercial lease is: what’s included in my rent? The answer depends on the lease structure. Here’s how the three most common types compare.

Triple Net (NNN) Lease

In a triple net lease, the tenant pays base rent plus their proportionate share of three additional expenses: property taxes, building insurance, and common area maintenance (CAM). These “three nets” are passed through to the tenant on top of base rent.

NNN leases are the most common structure in industrial and commercial real estate. They typically offer lower base rent because the tenant absorbs more of the operating costs. The tradeoff: your monthly costs can vary year to year as taxes, insurance premiums, and maintenance expenses change.

What to watch for in an NNN lease:

• Ask for a CAM cap — a limit on how much operating expenses can increase year over year (commonly 3–5%)
• Request an audit right so you can verify the landlord’s expense calculations
• Understand what’s included vs. excluded from CAM (e.g., management fees, capital expenditures)
• Ask for an annual reconciliation statement so you can see how estimated charges compared to actual costs

Gross Lease

In a gross lease, the tenant pays a flat monthly rent that includes most operating costs. The landlord covers property taxes, insurance, and maintenance. This structure offers more predictability for the tenant, though base rent is typically higher to account for those costs.

Gross leases are more common in office settings but can sometimes be found in smaller retail or flex commercial spaces. They’re generally simpler to budget for, since your monthly payment doesn’t fluctuate with operating expense changes.

Modified Gross Lease

A modified gross lease falls between a full gross and a triple net. Base rent is fixed, but certain operating expenses are split between landlord and tenant based on what’s negotiated in the lease. For example, a tenant might pay for their own utilities and janitorial costs, while the landlord covers taxes and insurance.

Modified gross leases are common in multi-tenant industrial parks and office buildings. Because the split is negotiated, it’s especially important to get clear, written terms on exactly which expenses are the tenant’s responsibility.

Quick Comparison

NNN Lease: Tenant pays base rent + taxes + insurance + CAM. Lower base rent, variable total cost. Most common in industrial.

Gross Lease: Tenant pays flat rent, landlord covers operating expenses. Higher base rent, predictable cost.

Modified Gross: Negotiated split. Some expenses included in rent, others passed to tenant. Hybrid predictability.

Section 3: Tenant Rights and Responsibilities

A lease is a two-way agreement. Knowing what you’re entitled to — and what’s expected of you — can save you from disputes, unexpected costs, and legal complications.

Your Rights as a Tenant

Right to Quiet Enjoyment

You have the right to use your leased space without interference from the landlord. This means the landlord cannot enter your space without proper notice (typically 24–48 hours, unless it’s an emergency) or disrupt your business operations unreasonably.

Right to a Habitable, Functional Space

The landlord is generally responsible for keeping the building’s structural elements, roof, plumbing, HVAC systems, and common areas in working order. If critical systems fail (e.g., the HVAC in a warehouse goes down in summer), you have the right to timely repairs. Document all maintenance requests in writing.

Right to Review Operating Expense Records

In most NNN leases, you have the right to audit the landlord’s operating expense calculations. If you suspect your CAM charges are inaccurate, you can request supporting documentation. Many tenants never exercise this right — but having it written into your lease is important.

Right to Sublease or Assign (If Permitted)

Some leases allow you to sublease your space or assign the lease to another party, subject to landlord approval. This can be a valuable exit option if your business needs change mid-term. Check your lease carefully — sublease rights are often restricted or require consent.

Your Responsibilities as a Tenant

Pay Rent on Time

This is your primary obligation. Understand your grace period (if any) and the late fee structure. Chronic late payments can damage your relationship with the landlord and may affect your ability to renew or negotiate future leases.

Maintain the Interior of Your Space

In most commercial leases, tenants are responsible for the interior maintenance of their space — keeping it clean, preventing damage beyond normal wear and tear, and making minor repairs. Anything you alter or install is typically your responsibility to maintain.

Comply with Permitted Use

Your lease will define the permitted use of the space (e.g., “light manufacturing and warehouse storage”). Operating outside of that defined use can be a lease violation. If your business needs change, get written approval before expanding or changing how you use the space.

Restore the Space at Lease End

Many leases include a restoration clause requiring you to return the space to its original condition when you move out. This can include removing signage, fixtures, or any modifications you made. Clarify upfront which improvements will stay and which must be removed.

Carry Required Insurance

Most commercial leases require tenants to maintain general liability insurance and, in some cases, property insurance for their business assets. Confirm the required coverage limits with your landlord and make sure your certificate of insurance names the landlord as an additional insured.

Working With a Broker You Can Trust

Understanding your lease is one thing — negotiating it is another. A knowledgeable broker doesn’t just find you space; they help you understand what you’re agreeing to, identify red flags before you sign, and negotiate terms that protect your business.

At Trico Realty, we’ve been helping businesses navigate the Orange County industrial and commercial market since 1968. Whether you’re signing your first lease or renegotiating your tenth, we’re here to make the process straightforward.

Ready to find the right space — or review your current lease? Contact Trico Realty at 714.751.4420 or visit tricorealty.com. We’d love to help.

Trico Realty, Inc.  ·  3100 Pullman St., Suite A, Costa Mesa, CA 92626  ·  714.751.4420  ·  DRE #00342120