How Property Tax Increases Are Passed Through to Tenants in Commercial Leases

Real estate taxes are a significant operating cost for commercial property owners, and how those taxes are allocated between landlords and tenants is a central economic issue in many commercial leases. In Massachusetts, as in most states, property tax pass-throughs are governed primarily by the lease rather than statute, making careful drafting essential for both parties.

This article discusses how property tax increases are typically handled in Massachusetts commercial leases and highlights how these issues may differ in other jurisdictions, including California.

Property Taxes in Massachusetts Commercial Leases

In Massachusetts, commercial property taxes are generally assessed annually by the applicable municipality based on the property’s assessed value and local tax rate. Commercial leases commonly allocate responsibility for these taxes in one of several ways:

• Triple-net (NNN) leases, where tenants pay their proportionate share of real estate taxes directly or as additional rent
• Base year or modified gross leases, where the landlord bears taxes up to a defined base amount and tenants pay increases over that base
• Gross leases, where taxes are included in rent, subject to limited escalation provisions

Because Massachusetts law does not impose mandatory allocation rules for commercial leases, the lease language controls.

Base Year Structures and Tax Increases

Many Massachusetts office and multi-tenant retail leases use a base year or base tax structure. Under this approach:

• The landlord establishes a baseline amount of real estate taxes (often the taxes payable for a specified fiscal year)
• The tenant pays its proportionate share of any increases above that base

Reassessments Following Sale or Improvement

In Massachusetts, a transfer of ownership or substantial improvements to a property can lead to a reassessment, resulting higher real estate taxes. However, because taxes are adjusted on an ongoing basis based on a property’s assessed value, there is less potential for a material adjustment than is the case in other states with an artificial cap on increases in property taxes.

Property Tax Appeals and Refunds

Another important issue is how property tax appeals are handled. Leases should clearly address:

• Which party has the right to pursue a tax abatement
• Whether tenants must participate or share in the cost
• How refunds are allocated if an appeal is successful

In Massachusetts, where abatements may apply retroactively to prior fiscal years, failure to address refunds can lead to disagreements over who benefits from a successful appeal.

Comparison: California and Proposition 13

California presents a materially different framework due to Proposition 13, which generally limits annual increases in assessed value to 2% unless there is a change in ownership or new construction. As a result:

• Property taxes may remain artificially low for long-held assets
• A sale can trigger a substantial reassessment to fair market value

In California commercial leases, tenants are often particularly focused on Proposition 13 protection, which may include:

• Full protection, where tenants are insulated from tax increases resulting from a sale
• Partial protection, where tenants bear increases only above a negotiated threshold
• Time-limited protection, which expires after a certain number of years

Landlords in California frequently view Prop 13 protection as a significant economic concession, particularly in stabilized assets with low historical tax bases.

Other State Variations

Other states may impose reassessment rules, tax caps, or statutory allocation requirements that differ from Massachusetts. For multi-state portfolios, it is especially important that leases be reviewed with an understanding of local tax regimes rather than relying on standardized lease language.

Practical Drafting Considerations

Whether in Massachusetts or elsewhere, commercial leases should clearly address:

• What constitutes “real estate taxes” for pass-through purposes
• How increases are calculated and allocated
• Treatment of reassessments, abatements, and refunds

For tenants, these provisions can significantly affect occupancy costs over time. For landlords, they influence asset value, underwriting, and marketability.

Conclusion

In Massachusetts commercial leases, property tax pass-throughs are largely a matter of contract, and small differences in drafting can have substantial financial consequences. While Massachusetts does not impose Prop 13-style limitations, understanding how tax increases are allocated—and how those rules differ in other jurisdictions such as California—is essential for both landlords and tenants. Careful negotiation and clear drafting at the outset can help avoid surprises when assessments change.