# Modified Gross Lease: What It Is and How It Works in Commercial Real Estate Published: 2026-02-03 Author: Warren Team URL: https://www.heywarren.com/blog/modified-gross-leases --- A modified gross lease is a commercial real estate lease structure in which the tenant pays a base rent plus a negotiated portion of operating expenses, typically some but not all of the property expenses that a landlord bears in a full gross lease, and fewer expenses than in a triple net (NNN) lease. The exact division of expenses is negotiated between landlord and tenant and specified in the lease agreement, making modified gross leases the most flexible and commonly used structure in office, flex, and some retail property sectors. Understanding the modified gross lease, and how it compares to gross and net leases, is essential for commercial tenants, property investors, and real estate analysts. ## The Three Main Commercial Lease Types Before understanding modified gross, the baseline comparison: ![The spectrum from full gross to triple net, with modified gross as the negotiated middle ground.](data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20600%20211%22%20width%3D%22600%22%20height%3D%22211%22%20role%3D%22img%22%3E%3Ctitle%3EHierarchy%3C%2Ftitle%3E%3Crect%20width%3D%22100%25%22%20height%3D%22100%25%22%20fill%3D%22%23f8fafc%22%2F%3E%3Crect%20x%3D%22220%22%20y%3D%2220%22%20width%3D%22160%22%20height%3D%2258%22%20rx%3D%228%22%20fill%3D%22%232563eb%22%2F%3E%3Ctext%20x%3D%22300%22%20y%3D%2254%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22700%22%20fill%3D%22white%22%3ECommercial%20Leases%3C%2Ftext%3E%3Cpath%20d%3D%22M%20300%2078%20L%20300%20105.5%20L%20120%20105.5%20L%20120%20133%22%20stroke%3D%22%23cbd5e1%22%20stroke-width%3D%222%22%20fill%3D%22none%22%2F%3E%3Crect%20x%3D%2240%22%20y%3D%22133%22%20width%3D%22160%22%20height%3D%2258%22%20rx%3D%228%22%20fill%3D%22white%22%20stroke%3D%22%230891b2%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22120%22%20y%3D%22158%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2213%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EFull%20Gross%3C%2Ftext%3E%3Ctext%20x%3D%22120%22%20y%3D%22176%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3ELandlord%20pays%20all%20opex%3C%2Ftext%3E%3Cpath%20d%3D%22M%20300%2078%20L%20300%20105.5%20L%20300%20105.5%20L%20300%20133%22%20stroke%3D%22%23cbd5e1%22%20stroke-width%3D%222%22%20fill%3D%22none%22%2F%3E%3Crect%20x%3D%22220%22%20y%3D%22133%22%20width%3D%22160%22%20height%3D%2258%22%20rx%3D%228%22%20fill%3D%22white%22%20stroke%3D%22%230891b2%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22300%22%20y%3D%22158%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2213%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EModified%20Gross%3C%2Ftext%3E%3Ctext%20x%3D%22300%22%20y%3D%22176%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3ENegotiated%20split%3C%2Ftext%3E%3Cpath%20d%3D%22M%20300%2078%20L%20300%20105.5%20L%20480%20105.5%20L%20480%20133%22%20stroke%3D%22%23cbd5e1%22%20stroke-width%3D%222%22%20fill%3D%22none%22%2F%3E%3Crect%20x%3D%22400%22%20y%3D%22133%22%20width%3D%22160%22%20height%3D%2258%22%20rx%3D%228%22%20fill%3D%22white%22%20stroke%3D%22%230891b2%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22480%22%20y%3D%22158%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2213%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3ETriple%20Net%20%28NNN%29%3C%2Ftext%3E%3Ctext%20x%3D%22480%22%20y%3D%22176%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3ETenant%20pays%20all%20opex%3C%2Ftext%3E%3C%2Fsvg%3E) *The spectrum from full gross to triple net, with modified gross as the negotiated middle ground.* **Full gross (gross lease)**: Landlord pays ALL operating expenses, taxes, insurance, utilities, maintenance, janitorial. Tenant pays only the fixed base rent. Simplest for tenants; highest base rent. **Triple net (NNN) lease**: Tenant pays base rent PLUS taxes, insurance, and maintenance/CAM (common area maintenance). Landlord has minimal ongoing expense exposure. Lowest base rent; highest total cost predictability for landlord. **Modified gross lease**: A middle ground, tenant pays base rent plus **some** operating expenses as negotiated. Which expenses are passed through varies by property and negotiation. ## What a Modified Gross Lease Typically Includes There is no single definition of "modified gross", the structure varies by market, property type, and negotiation. Common structures: **Tenant typically pays in a modified gross lease**: - Base rent - Electricity and utilities used within their space - Janitorial services for their space - Proportionate share of increases in property taxes and insurance above a base year amount ("expense stops") **Landlord typically retains in a modified gross lease**: - Structural repairs and capital expenditures - Roof and exterior maintenance - Common area maintenance (lobby, corridors, parking) - Property management fees The "base year" concept is central to many modified gross leases: the landlord covers the operating expenses at the base year level; the tenant pays any increases above that base year amount. If operating costs rise significantly (due to inflation, property tax reassessment, or energy prices), the tenant absorbs the increase. ## Modified Gross vs. Triple Net: Key Differences | Expense Category | Modified Gross Lease | Triple Net (NNN) Lease | |---|---|---| | Property taxes | Tenant pays increases above base year | Tenant pays all | | Insurance | Tenant pays increases above base year | Tenant pays all | | Common area maintenance (CAM) | Usually landlord's responsibility | Tenant pays all | | Utilities (tenant space) | Tenant pays directly | Tenant pays directly | | Structural maintenance | Landlord's responsibility | Landlord's responsibility (usually) | | Base rent level | Moderate (between gross and NNN) | Lowest (tenant absorbs most costs) | | Tenant cost predictability | Moderate | Lowest (operating costs variable) | | Landlord risk | Moderate | Lowest | ## Expense Stops and Base Year Structures The most important modified gross lease mechanism is the **expense stop**: ![How base year expense stops pass operating cost increases from landlord to tenant over the lease term.](data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20875%20125%22%20width%3D%22875%22%20height%3D%22125%22%20role%3D%22img%22%3E%3Ctitle%3EFlow%20diagram%3C%2Ftitle%3E%3Crect%20width%3D%22100%25%22%20height%3D%22100%25%22%20fill%3D%22%23f8fafc%22%2F%3E%3Crect%20x%3D%2230%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22115%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EBase%20Year%3C%2Ftext%3E%3Ctext%20x%3D%22115%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3E%248.50%2Fsq%20ft%3C%2Ftext%3E%3Cline%20x1%3D%22205%22%20y1%3D%2262.5%22%20x2%3D%22237%22%20y2%3D%2262.5%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Cpolygon%20points%3D%22244%2C62.5%20235%2C57.5%20235%2C67.5%22%20fill%3D%22%2364748b%22%2F%3E%3Crect%20x%3D%22245%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22330%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3ELandlord%20Covers%3C%2Ftext%3E%3Ctext%20x%3D%22330%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3EUp%20to%20base%3C%2Ftext%3E%3Cline%20x1%3D%22420%22%20y1%3D%2262.5%22%20x2%3D%22452%22%20y2%3D%2262.5%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Cpolygon%20points%3D%22459%2C62.5%20450%2C57.5%20450%2C67.5%22%20fill%3D%22%2364748b%22%2F%3E%3Crect%20x%3D%22460%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22545%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3ECost%20Rises%3C%2Ftext%3E%3Ctext%20x%3D%22545%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3E%2410.00%2Fsq%20ft%3C%2Ftext%3E%3Cline%20x1%3D%22635%22%20y1%3D%2262.5%22%20x2%3D%22667%22%20y2%3D%2262.5%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Cpolygon%20points%3D%22674%2C62.5%20665%2C57.5%20665%2C67.5%22%20fill%3D%22%2364748b%22%2F%3E%3Crect%20x%3D%22675%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22760%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3ETenant%20Pays%3C%2Ftext%3E%3Ctext%20x%3D%22760%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3E%241.50%20increase%3C%2Ftext%3E%3C%2Fsvg%3E) *How base year expense stops pass operating cost increases from landlord to tenant over the lease term.* - In the base year (often the first year of the lease), the landlord's actual operating costs are established as the "base" - In subsequent years, any operating costs **above** the base are divided between landlord and tenant per the lease - The expense stop is the amount per square foot above which the tenant absorbs increases **Example**: - Base year operating expenses: $8.50 per sq ft - Year 3 actual expenses: $10.00 per sq ft - Increase above base: $1.50 per sq ft - Tenant's 25,000 sq ft space pays: 25,000 × $1.50 = **$37,500 more per year** The expense stop structure means tenants' total occupancy cost can increase over time even with a fixed base rent, an important factor in long-term lease modelling. ## Who Uses Modified Gross Leases? **Office property**: The most common sector for modified gross leases. Class A office buildings in major markets (New York, Chicago, Los Angeles) widely use modified gross structures, with tenants paying direct utilities and a proportionate share of operating expense increases. **Flex/industrial**: Medium-term leases in flex space often use modified gross structures that reflect negotiated expense splits. **Medical office**: Similar to general office, modified gross is common with specific provisions for medical-use expenses (HVAC requirements, plumbing intensity). ## Authoritative Sources For deeper background and primary-source data on this topic, the following authoritative sources are useful starting points: - [IRS](https://www.irs.gov/) - [SEC](https://www.sec.gov/) ## Conclusion The modified gross lease is the practical middle ground of commercial real estate, it provides landlords with some protection against rising operating costs while giving tenants a simpler, more predictable expense structure than a full NNN lease. The specific expense allocation is entirely negotiated, making lease comparison complex: "modified gross" from two different landlords may mean very different cost structures. Tenants negotiating modified gross leases must fully model the expense stop implications over the full lease term, not just the base rent. For related commercial real estate concepts, see our guides on [triple net leases](/blog/triple-net-lease) and [operating vs. finance leases](/blog/operating-vs-financial-lease). Warren at [heywarren.com](https://heywarren.com) helps commercial tenants, property investors, and real estate professionals understand lease structures, model occupancy costs, and negotiate commercial lease terms. --- ## Related Reading **More from Warren**: - [Triple Net Lease (NNN): What It Is and How It Works](/blog/triple-net-lease) - [Operating Lease vs. Finance Lease: Key Differences in Accounting and Economics](/blog/operating-vs-financial-lease) - [Proration in Real Estate: What It Is and How It's Calculated](/blog/what-is-a-proration) **Authoritative sources**: - [BOMA, Commercial Leasing Standards](https://www.boma.org/BOMA/Resources/Leasing) - [CBRE, Commercial Real Estate](https://www.cbre.com/insights) - [Urban Land Institute, Office Market Research](https://uli.org/research/)