Commercial Lease Operating Expenses: The Complete Guide to Understanding, Auditing, and Negotiating OpEx (2026)

What Are Operating Expenses in a Commercial Lease?

Operating expenses — often abbreviated as OpEx — represent the ongoing costs a landlord incurs to operate, maintain, insure, and manage a commercial property. In virtually every multi-tenant commercial lease, some or all of these costs are passed through to tenants on a proportionate basis. The exact mechanism for this passthrough varies depending on the lease structure, but the underlying concept is the same: the landlord aggregates the building's operating costs for a given calendar year and allocates them among tenants based on each tenant's proportionate share of the building.

The term "operating expenses" is deceptively broad. It typically encompasses property taxes and assessments, property insurance premiums, common area maintenance (CAM) charges, utilities for shared spaces, management fees, janitorial services, security, landscaping, elevator maintenance, fire and life safety system upkeep, and a long list of additional line items that vary from building to building. In a modern Class A office tower, the operating expense pool can include more than 50 distinct cost categories, each with its own nuances and potential for dispute.

Understanding operating expenses is not optional for commercial tenants or their advisors. OpEx charges typically represent 25% to 40% of a tenant's total occupancy cost in a net lease structure, and even in a gross lease, escalations above a base year can add up to hundreds of thousands of dollars over a typical five- to ten-year lease term. Getting these provisions right at the negotiation stage — and staying vigilant through annual reconciliation — is one of the highest-ROI activities in commercial real estate.

Types of Operating Expenses: Breaking Down the Major Categories

Operating expenses in a commercial lease generally fall into several broad categories. Each category contains numerous sub-line items, and the definitions can vary significantly depending on the lease language, the property type, and the jurisdiction. Below is a detailed breakdown of the major categories you will encounter in virtually every commercial lease.

Common Area Maintenance (CAM)

CAM charges cover the costs of maintaining and operating the common areas of the building and property. In an office building, common areas include lobbies, hallways, elevator banks, restrooms on multi-tenant floors, stairwells, parking garages, loading docks, and shared conference facilities. In a retail property, CAM extends to parking lots, sidewalks, landscaped areas, food courts, and other shared spaces.

Typical CAM line items include janitorial and cleaning services for common areas, landscaping and grounds maintenance, snow and ice removal, parking lot sweeping and striping, elevator and escalator maintenance contracts, HVAC maintenance for common systems, pest control, trash removal and recycling services, common area lighting and electrical costs, and general repairs to the building structure and systems. CAM is often the single largest component of operating expenses in retail properties, sometimes representing 40% to 60% of the total OpEx pool.

Real Estate Taxes and Assessments

Property taxes are typically the largest single line item in the operating expense pool for office buildings, frequently accounting for 30% to 50% of total operating expenses. This category includes ad valorem real estate taxes levied by local taxing authorities, special assessments for infrastructure improvements, business improvement district (BID) assessments, and in some jurisdictions, personal property taxes on building fixtures and equipment.

Tax expenses deserve particular attention because they are subject to significant year-over-year volatility. A reassessment upon sale, a change in local tax rates, or the expiration of a tax abatement can cause tax expenses to spike dramatically in a single year. Sophisticated tenants negotiate specific protections around tax expenses, including caps on passthrough increases related to sales or refinancing events.

Insurance

The insurance component of operating expenses covers the premiums the landlord pays to insure the building and property. This typically includes property/casualty insurance, general liability insurance, umbrella/excess liability coverage, earthquake or flood insurance where applicable, boiler and machinery coverage, and environmental liability insurance. Insurance costs have been rising sharply in recent years, driven by increased natural disaster frequency, rising construction costs that inflate replacement values, and a hardening insurance market. Between 2022 and 2025, commercial property insurance premiums increased by an average of 8% to 12% annually in most U.S. markets.

Management Fees

Landlords charge a management fee for overseeing the day-to-day operations of the building. This fee is typically calculated as a percentage of gross revenues or effective gross income, ranging from 2% to 6% depending on the property type, size, and market. In many cases, the management company is an affiliate of the landlord, which creates an inherent conflict of interest. A landlord-affiliated management company has every incentive to set fees at the high end of market range and to staff the property generously, since those costs are passed through to tenants.

Utilities

Utility costs for common areas and shared building systems are included in operating expenses. This covers electricity for common area lighting, elevators, and shared HVAC systems; water and sewer charges for common restrooms and irrigation; and natural gas for heating in buildings with central boiler systems. In buildings where tenants are directly metered or sub-metered for their own suite utilities, the OpEx utility charges should be limited to common area and shared system consumption. However, in buildings without individual metering, the entire building's utility costs may be included in the OpEx pool and allocated proportionally, which can create significant inequities between tenants with different usage patterns.

Repairs and Maintenance

Ongoing repairs and maintenance to the building's structure, systems, and common areas are a standard OpEx component. This includes roof repairs (but typically not full replacement), plumbing and electrical system maintenance, window washing, painting common areas, and maintaining building directories and signage. The critical distinction here is between maintenance and repair on one hand, and capital improvements on the other. Capital expenditures — improvements that extend the useful life of a building component or add new functionality — should generally not be included in operating expenses, or if they are, they should be amortized over their useful life rather than expensed in a single year.

Operating Expense Category Breakdown

Gross vs. Net Lease: How OpEx Structures Differ

The way operating expenses are handled depends fundamentally on the lease structure. The two primary structures — gross leases and net leases — take very different approaches to allocating operating costs between landlord and tenant, and each comes with distinct risks and negotiation priorities.

Gross Lease (Full-Service Lease)

In a gross lease, the tenant pays a single, all-inclusive rent amount, and the landlord is responsible for paying all operating expenses out of that rent. From the tenant's perspective, the appeal of a gross lease is simplicity and predictability: you know exactly what your occupancy cost will be each month. However, true "flat" gross leases are rare in commercial real estate. Almost all gross leases include an escalation mechanism that requires the tenant to pay their proportionate share of operating expense increases above a specified baseline, known as the base year or expense stop.

Net Lease (NNN / Triple Net)

In a net lease, the tenant pays a lower base rent plus their proportionate share of some or all operating expenses. The most common variant is the triple net lease (NNN), where the tenant pays base rent plus their pro rata share of real estate taxes, insurance, and CAM charges. Net leases are standard in retail and industrial properties and are increasingly common in suburban office markets. The tenant bears the full risk of operating expense fluctuations, which means costs can vary significantly from year to year.

Modified Gross Lease

A modified gross lease falls between the two extremes. The landlord and tenant negotiate which specific expense categories are included in the base rent and which are passed through separately. For example, a modified gross lease might include taxes and insurance in the base rent but require the tenant to pay CAM charges separately. Modified gross structures are common in multi-tenant office buildings where landlords want to provide some cost certainty while still passing through the most volatile expense categories.

Base Year vs. Expense Stop: Two Critical Escalation Mechanisms

In gross and modified gross leases, the mechanism for passing through operating expense increases above a baseline is one of the most financially consequential provisions in the entire lease. The two primary mechanisms are the base year approach and the expense stop approach, and they work quite differently.

Base Year

Under a base year structure, the landlord establishes a baseline by calculating the actual operating expenses for a specified calendar year — typically the year in which the lease commences or the first full calendar year of the lease term. The tenant then pays their proportionate share of operating expenses that exceed the base year amount in each subsequent year. If operating expenses in the base year are $14.00 per square foot and expenses in Year 3 are $15.50 per square foot, the tenant pays the $1.50 per square foot increase.

The base year approach is standard in most Class A and Class B office leases. Its primary advantage for tenants is that it provides a real, verifiable baseline tied to actual building expenses. However, the base year is only as good as the year it represents. If the base year is artificially low — because the building had unusually high vacancy, received a one-time tax abatement, or the landlord deferred maintenance — the tenant will pay higher escalations for the entire lease term.

Expense Stop

An expense stop is a fixed dollar amount per square foot established at lease signing. The tenant pays their proportionate share of operating expenses that exceed this predetermined stop. For example, if the expense stop is set at $13.50 per square foot and actual expenses come in at $15.00, the tenant pays the $1.50 difference. Unlike a base year, the expense stop is negotiated upfront and does not change based on actual expenses in any particular year.

Expense stops can be advantageous for tenants when they are set at a level that accurately reflects or slightly exceeds current operating expenses. However, if the stop is set too low, the tenant immediately begins paying escalations from day one. This is a common trap in leases where the landlord sets the expense stop below current actual expenses, effectively converting what appears to be a gross lease into a net lease from inception.

Controllable vs. Uncontrollable Expenses

One of the most important distinctions in operating expense negotiations is between controllable and uncontrollable expenses. This classification determines which expenses are subject to annual increase caps and which can escalate without limit.

Controllable Expenses

Controllable expenses are costs over which the landlord has direct influence through management decisions, vendor selection, and staffing choices. These include janitorial services, landscaping, security, general repairs and maintenance, management fees, and administrative costs. Because the landlord can directly influence these costs, tenants can reasonably negotiate annual caps on their increases — typically 3% to 5% per year on a cumulative, compounding basis.

The rationale for capping controllable expenses is straightforward: if a landlord chooses to switch to a premium janitorial service, hire additional security guards, or upgrade the landscaping, tenants should not bear the full brunt of those discretionary spending decisions without some limitation. Caps on controllable expenses protect tenants from both poor management decisions and deliberate cost inflation.

Uncontrollable Expenses

Uncontrollable expenses are costs that are largely determined by external forces beyond the landlord's direct control. The two primary uncontrollable categories are real estate taxes (set by government assessors and taxing authorities) and insurance premiums (set by the insurance market). Utility costs are sometimes classified as uncontrollable, though this is debatable since landlords can influence utility consumption through efficiency investments and operational practices.

Landlords will typically resist capping uncontrollable expenses, and there is some logic to their position: if tax assessments spike 15% in a single year, the landlord cannot absorb that cost any more than the tenant can. However, tenants can still negotiate meaningful protections around uncontrollable expenses, such as requiring the landlord to appeal tax assessments when they exceed a certain threshold, prohibiting the passthrough of tax increases attributable to building sales or refinancing, and requiring the landlord to maintain a competitive insurance bidding process.

How to Audit Operating Expense Statements: A Step-by-Step Process

Auditing operating expense statements is not merely a good practice — it is an essential financial discipline that can recover tens or hundreds of thousands of dollars over a lease term. The audit process requires access to the landlord's books and records, a systematic approach to reviewing each line item, and enough knowledge of operating expense norms to identify anomalies and errors.

Step 1: Exercise Your Audit Rights

Your lease should contain an audit rights provision that gives you the right to examine the landlord's books, records, and supporting documentation for operating expenses. This right typically must be exercised within a specified window — usually 90 to 180 days after receiving the annual reconciliation statement. Send a formal written notice to the landlord within this window, clearly stating your intent to audit and requesting access to all supporting documentation including invoices, contracts, check registers, general ledger detail, and tax bills.

Step 2: Obtain and Organize Documentation

Request the following documentation from the landlord: the detailed operating expense statement showing all line items and amounts, the building's general ledger for the audit year, copies of all property tax bills and assessment notices, insurance policies and premium invoices, management agreements, service contracts for major vendors (janitorial, security, HVAC maintenance, elevator maintenance, landscaping), utility bills for the audit year, and any capital expenditure records that may have been included in operating expenses. Organize this documentation by expense category so you can systematically review each area.

Step 3: Verify Proportionate Share Calculations

Before examining individual expense amounts, verify that your proportionate share is calculated correctly. Confirm the total rentable square footage of the building, your suite's rentable square footage, and the resulting proportionate share percentage. Errors in square footage measurements and proportionate share calculations are surprisingly common and can compound across every expense category. Also verify whether the landlord is applying a gross-up adjustment correctly — if the building was less than 95% occupied, variable expenses should be grossed up, but fixed expenses should not.

Step 4: Review Each Expense Category

Go through each expense category and compare the amounts to prior years, looking for unusual spikes, new line items that were not previously included, and amounts that seem out of proportion to the building's size and class. Cross-reference the amounts on the operating expense statement to the supporting invoices and general ledger. Verify that every charge included in the statement is actually permitted under the lease's operating expense definition and that no excluded items have been slipped in.

Step 5: Check for Capital Expense Inclusion

One of the most common overcharges is the inclusion of capital expenditures in the operating expense pool without proper amortization. If a landlord replaced the building's roof for $500,000, that cost should not appear as a single-year operating expense. Under most leases, capital expenditures can only be included if they are amortized over their useful life in accordance with GAAP, and some leases exclude capital expenditures entirely. Review any large or unusual line items carefully and request supporting documentation to determine whether they represent ongoing operating costs or capital improvements.

Step 6: Document Findings and Negotiate Resolution

Compile your findings into a clear, well-organized audit report that identifies each disputed item, the amount in question, the lease provision that supports your position, and the credit you are requesting. Present this report to the landlord in a professional manner and be prepared to negotiate. Most landlords will concede clear errors quickly but may push back on judgment calls. Be prepared to escalate to the dispute resolution mechanism in your lease (typically mediation or arbitration) if you cannot reach agreement on significant items.

Operating Expense Audit Checklist

• Confirm audit right window and send timely written notice to landlord
• Obtain full general ledger detail, not just summary statements
• Verify total building RSF and tenant proportionate share percentage
• Confirm gross-up methodology is applied correctly for variable expenses
• Compare each line item to prior year for unusual increases (>5%)
• Cross-reference statement amounts to actual invoices and contracts
• Identify any capital expenditures improperly expensed in a single year
• Verify management fees are calculated on the correct base amount
• Check that excluded expenses per the lease are not included in the pool
• Confirm property tax amounts match actual tax bills from the assessor
• Verify insurance premiums against actual policy declarations pages
• Check for above-market or related-party vendor pricing
• Ensure no tenant-specific costs are included in the shared expense pool
• Verify utility charges exclude any separately metered tenant spaces
• Compile findings with lease references and present to landlord for credit

Common Landlord Overcharges: The Red Flags to Watch For

After reviewing thousands of operating expense statements, certain patterns of overcharging emerge repeatedly. While not every instance is intentional — many result from accounting errors, staff turnover, or complex multi-building allocations — the financial impact on tenants is the same regardless of intent. Here are the most common overcharges found in operating expense audits.

Capital Expenditures Expensed in a Single Year

This is the most financially significant overcharge category. Roof replacements, HVAC system overhauls, elevator modernizations, parking lot repaving, and lobby renovations are capital expenditures that should be amortized over their useful life — typically 10 to 20 years depending on the improvement type. When a landlord expenses a $400,000 roof replacement in a single year, a tenant occupying 10% of the building absorbs $40,000 in that year alone. Properly amortized over 15 years, the same tenant's annual share would be approximately $2,667. The difference is staggering.

Incorrect Proportionate Share

Errors in the calculation of proportionate share can arise from incorrect measurements of the building's total rentable area, failure to update square footage after renovations, or simple mathematical errors. A seemingly small discrepancy — say, the building is listed at 180,000 RSF when it actually measures 192,000 RSF — increases every tenant's proportionate share and cascades across all expense categories and all years of the lease.

Gross-Up Errors

When a building is less than fully occupied, landlords are entitled to gross up variable operating expenses to reflect what those expenses would have been at full occupancy (typically 95%). However, this adjustment should only apply to variable expenses — costs that genuinely increase with occupancy, such as janitorial services, utilities, and elevator maintenance. Fixed costs like real estate taxes, insurance, and base management fees do not vary with occupancy and should not be grossed up. Landlords frequently gross up the entire expense pool, including fixed costs, which inflates the base year or current year amount.

Included Exclusions

Most well-negotiated leases contain a list of specific exclusions from operating expenses. Common exclusions include leasing commissions, tenant improvement costs, depreciation, debt service, ground rent, the landlord's income taxes, costs of correcting construction defects, and costs covered by insurance or warranty. Despite these exclusions being clearly stated in the lease, items that should be excluded routinely show up in operating expense statements. This can happen because the property manager is unfamiliar with the specific lease terms, the accounting system is set up using a standard chart of accounts that does not reflect individual lease exclusions, or in some cases, because the landlord is testing whether the tenant will notice.

Related-Party Markups

When the landlord uses affiliated companies to provide building services — management, janitorial, security, construction management — there is an inherent risk that these services are priced above market rates. A landlord-affiliated management company might charge 5% of gross revenues when the market rate is 3%, or an affiliated janitorial company might charge $1.50 per square foot when competitive bids would come in at $1.10. Always verify that related-party service contracts are at or below market rates, and negotiate a lease provision requiring that affiliated services be competitively priced.

Double Counting

In multi-building complexes or mixed-use developments, expenses can be allocated at multiple levels: first to the overall complex, then to individual buildings, then to individual tenants. This layered allocation creates opportunities for double counting, where the same expense appears in both the complex-level and building-level allocations. This is particularly common with shared amenities, parking facilities, and centralized services like security or engineering.

OpEx Negotiation Strategies: Protecting Your Position Before Signing

The most effective way to control operating expense exposure is to negotiate strong protections into the lease before signing. Once the lease is executed, your ability to challenge expenses is limited to the specific rights contained in the document. Here are the key provisions to negotiate and the strategies to employ.

Negotiate a Comprehensive Exclusions List

The exclusions list defines what cannot be included in operating expenses, and it is arguably the most important OpEx provision in the lease. A well-drafted exclusions list should include at minimum the following items: capital expenditures (except those required by changes in law or that reduce operating costs, amortized over useful life); costs of correcting latent defects in original construction; depreciation and amortization (except as specifically permitted); debt service including mortgage interest and principal payments; ground lease rent; leasing costs including commissions, advertising, and tenant improvements; legal fees for lease disputes or tenant defaults; the landlord's general corporate overhead unrelated to building operations; costs reimbursed by insurance, warranties, or condemnation proceeds; fines, penalties, and interest charges resulting from the landlord's negligence; above-standard services provided to specific tenants and billed separately; art purchases, sculptures, and decorative items beyond standard building decor; charitable or political contributions; and costs of compliance with environmental laws resulting from pre-existing contamination.

Cap Controllable Expenses

Negotiate an annual cap on controllable operating expense increases. The standard cap ranges from 3% to 5% per year on a cumulative, compounding basis. The cumulative and compounding aspects are important: a cumulative cap means the cap builds on the prior year's actual expenses (or capped amount), while a non-cumulative cap resets to the base year each year. A compounding cap of 4% means controllable expenses cannot increase more than 4% over the prior year's capped amount, even if actual expenses increased by 8%. Over a 10-year lease term, a 4% cumulative compounding cap on controllable expenses can save a tenant hundreds of thousands of dollars compared to an uncapped structure.

Negotiate the Base Year Carefully

If your lease uses a base year structure, ensure the base year is representative of normal building operations. Negotiate provisions requiring the base year to be grossed up to 95% occupancy for variable expenses. If the building is new or recently renovated, the first year of operations may not reflect stabilized expenses — consider negotiating a stipulated base year amount or using the second full calendar year as the base. Also negotiate a provision that the base year cannot be restated or adjusted retroactively by the landlord, as some landlords attempt to reduce the base year after the fact to increase escalations.

Require Competitive Bidding for Services

Include a lease provision requiring the landlord to obtain competitive bids for major service contracts (janitorial, security, landscaping, elevator maintenance) at least every two to three years. This is particularly important when the landlord uses affiliated service providers. The provision should require a minimum of three bids from unrelated vendors and should obligate the landlord to select the lowest qualified bid or justify in writing why a higher bid was selected.

Secure Strong Audit Rights

Your audit rights provision should include the following elements: a minimum of 180 days from receipt of the annual reconciliation statement to initiate an audit; the right to use a qualified third-party auditor, including firms that work on a contingency fee basis; access to all books, records, invoices, contracts, and general ledger detail supporting the operating expense statement; a provision requiring the landlord to reimburse the tenant's audit costs if the audit reveals an overcharge exceeding a specified threshold (typically 3% to 5%); a provision requiring the landlord to pay interest on any overcharge credits from the date of overpayment; and the right to audit operating expenses for any year during the lease term, not just the most recent year.

The math above illustrates why the expense stop amount matters enormously. If this tenant had negotiated an expense stop of $14.50 instead of $13.50, the 5-year escalation total would have been $19,550 instead of $61,200 — a savings of $41,650. This single negotiation point, often discussed for just a few minutes during lease negotiations, has a five-figure financial impact over a relatively short lease term.

Cap Provisions: Types, Structures, and How to Use Them

Operating expense caps are one of the most powerful tools available to tenants for controlling occupancy cost growth. Understanding the different types of caps and how they interact is essential for effective lease negotiation.

Cumulative Compounding Cap

A cumulative compounding cap limits the year-over-year increase in operating expenses (or specific categories of operating expenses) to a fixed percentage, calculated on the prior year's capped amount. For example, with a 4% cumulative compounding cap and a base year of $10.00 per square foot, the maximum chargeable amounts would be: Year 2: $10.40, Year 3: $10.82, Year 4: $11.25, and so on. This is the most common and most effective cap structure for tenants, because it limits the compounding effect of annual increases. If actual expenses spike in one year but the capped amount is lower, the cap remains the baseline for future years, permanently limiting the landlord's recovery.

Non-Cumulative Cap

A non-cumulative cap limits the total increase from the base year to a fixed percentage per year elapsed. Using the same $10.00 base with a 4% non-cumulative cap, the maximum amounts would be: Year 2: $10.40 (4% over base), Year 3: $10.80 (8% over base), Year 4: $11.20 (12% over base). This structure is less favorable to tenants because it allows the landlord to "catch up" in later years if actual expenses were below the cap in earlier years. Landlords often prefer non-cumulative caps for this reason.

Category-Specific Caps

Rather than capping total operating expenses, some leases apply caps to specific categories. This approach is often a useful compromise when the landlord resists a blanket cap. For example, you might negotiate a 4% cap on controllable expenses while leaving taxes and insurance uncapped but subject to other protections (appeal requirements, competitive bidding). Category-specific caps allow each expense type to be managed according to its nature and the degree of landlord control.

The Annual Reconciliation Process: What to Expect and How to Respond

Operating expense reconciliation is the annual process by which the landlord compares the estimated operating expenses collected from tenants during the year (through monthly escalation payments) to the actual operating expenses incurred. The result is either a credit to the tenant (if estimates exceeded actuals) or an additional charge (if actuals exceeded estimates).

Timeline and Deadlines

Most leases require the landlord to deliver the annual reconciliation statement within 90 to 120 days after the end of the calendar year, meaning tenants should receive their statements by March 31 or April 30. In practice, many landlords deliver statements late, sometimes by several months. Your lease should include a provision requiring timely delivery and imposing consequences for late delivery — either waiving the tenant's obligation to pay any additional charges, or at minimum, giving the tenant additional time to audit and dispute the statement.

Reviewing the Statement

When you receive your reconciliation statement, compare it to the prior year's statement line by line. Identify any new expense categories that did not appear in previous years, any categories with increases exceeding 5%, and any categories where the reconciliation amount (actual minus estimated) is unusually large. Also verify that the estimated amounts shown on the statement match the monthly estimates you have actually been paying throughout the year. Discrepancies here can indicate accounting errors.

Disputing Charges

If you identify questionable charges, raise them promptly in writing. Do not simply pay the additional amount and plan to dispute later — most leases require disputes to be raised within a specified period, and paying without objection can weaken your position in some jurisdictions. Your dispute letter should identify each contested line item, state the specific lease provision that supports your position, quantify the amount in dispute, and request a meeting with the landlord's property management team to resolve the issues.

If informal discussions do not resolve the dispute, escalate to a formal audit. Many tenants find that the threat of a formal audit, particularly by a specialized OpEx auditing firm, motivates landlords to resolve disputed charges more quickly and favorably. The landlord knows that a professional audit will likely uncover additional issues beyond those the tenant initially identified.

Critical Exclusions to Negotiate Into Your Lease

Beyond the standard exclusions discussed earlier, experienced CRE professionals negotiate additional, more specific exclusions that address common areas of abuse or ambiguity. Here are exclusions that are often overlooked but can save tenants significant money.

Costs Related to Other Tenants

Exclude any costs incurred in connection with services or work performed for specific tenants that are not provided to all tenants on a building-wide basis. This includes above-standard HVAC, after-hours utility costs for specific tenants, special security requirements, and any costs that a specific tenant has agreed to reimburse directly. Without this exclusion, the landlord can effectively subsidize one tenant's premium services by spreading the cost across all tenants.

Costs of Vacant Space

In a building with significant vacancy, the landlord may attempt to include the cost of maintaining, heating, cooling, and securing vacant spaces in the operating expense pool shared by all tenants. Negotiate an exclusion for costs attributable to vacant space that exceed what those costs would be if the space were occupied. This prevents you from subsidizing the landlord's vacancy problem.

Reserves and Sinking Funds

Some landlords attempt to include reserves for future capital expenditures or replacements in the annual operating expense pool. While building reserves is prudent financial management, tenants should not be required to fund the landlord's reserve accounts through operating expense charges. Exclude all reserve contributions, capital reserve funds, and sinking funds from operating expenses. If and when the reserved expenditure actually occurs, it can be addressed through the lease's capital expenditure provisions.

Costs Resulting from Landlord's Negligence

Fines, penalties, late fees, interest charges, and remediation costs resulting from the landlord's failure to comply with laws, maintain proper insurance, or fulfill contractual obligations should be excluded from operating expenses. The same applies to costs of litigation between the landlord and other tenants, costs of correcting building code violations that existed at the time of the lease, and costs of remediating environmental contamination that predates the lease.

Operating Expense Trends in 2026: What Tenants Need to Know

The operating expense landscape in 2026 is shaped by several converging trends that tenants and their advisors should factor into lease negotiations and budgeting.

Insurance Cost Escalation

Commercial property insurance premiums continue to rise at above-historical rates. Climate-related losses, increased litigation, and rising construction replacement costs are driving premiums higher, particularly in coastal and wildfire-prone markets. In some markets, property insurance costs have doubled over the past three years. Tenants should pay particular attention to insurance expense projections and consider negotiating insurance-specific protections, including requirements for competitive bidding, deductible limitations, and caps on premium increases attributable to the landlord's claims history rather than market conditions.

Energy and Sustainability Costs

Building performance standards in major cities — including New York's Local Law 97, Washington D.C.'s BEPS, and similar regulations in Boston, Denver, and other municipalities — are creating new compliance costs that landlords are attempting to pass through as operating expenses. These costs can include carbon offset purchases, energy efficiency retrofit amortization, benchmarking and reporting fees, and penalties for non-compliance. Tenants should carefully evaluate whether these costs are properly characterized as operating expenses or capital expenditures, and negotiate clear language addressing how sustainability-related costs are treated.

Technology and Smart Building Costs

Landlords are investing heavily in smart building technology — IoT sensors, building management systems, cybersecurity for building systems, and digital access control. While these investments can reduce long-term operating costs, the upfront costs are significant and are increasingly appearing in operating expense statements. Tenants should treat building technology upgrades as capital expenditures subject to amortization, not as current operating expenses to be passed through in full in the year incurred.

Labor Cost Pressures

Building operations labor costs — for engineers, janitorial staff, security personnel, and property management professionals — continue to rise above general inflation rates. In many markets, building operators face tight labor markets and are paying premium wages to retain qualified staff. These cost pressures are flowing directly into operating expenses. Caps on controllable expenses are more important than ever in this environment, as labor costs typically represent the largest single component of controllable operating expenses.

Frequently Asked Questions About Commercial Lease Operating Expenses