Montana Commercial Landlord-Tenant Laws: An Overview

Disclaimer: This guide provides general legal information for educational purposes only and does not constitute legal advice. Always consult a licensed commercial real estate attorney in Montana for advice specific to your situation. Information last verified: March 2026.

Montana's approach to commercial real estate law is defined by extreme deference to the written contract. Unlike the highly regulated residential sector, Montana lawmakers operate under the assumption that commercial landlords and business tenants are sophisticated entities capable of negotiating their own terms.

As a result, apart from a few default statutory mechanisms, the commercial lease agreement dictates almost every aspect of the landlord-tenant relationship in Montana.

The Supremacy of the Commercial Lease

statutory protections shielding residential tenants (like mandatory repairs, tight security deposit return deadlines, and late fee caps) do not unilaterally apply to commercial tenants unless explicitly written into their lease.

• Freedom of Contract: Montana courts will ruthlessly enforce the precise terms written in a commercial lease, even if those terms heavily favor the landlord.
• Good Faith and Fair Dealing: There is, however, an overarching implied covenant of good faith and fair dealing embedded in Montana contract law. Both parties must act honestly and observe reasonable commercial standards of fair dealing in the performance and enforcement of the lease.

See our Commercial Lease Requirements guide.

Maintenance and the NNN Lease

While MCA Title 70 outlines default maintenance rules (suggesting landlords handle significant repairs and tenants handle minor ones), the reality of Montana commercial real estate is vastly different.

The overwhelming standard for commercial properties in Montana is the Triple Net (NNN) Lease. Under a NNN lease, the financial burden of maintenance, repairs, building insurance, and property taxes is legally shifted completely onto the tenant.

See our Commercial Maintenance Obligations guide.

Security Deposits

Montana law imposes absolutely zero restrictions on commercial security deposits.

• There is no statutory maximum limit.
• Landlords are not required to hold the funds in a separate trust account.
• The landlord does not owe the tenant interest on the deposit.
• The strict 10-day/30-day return deadlines that govern residential deposits do not strictly apply; the timeline for the deposit's return is dictated entirely by the terms of the commercial lease.

See our Commercial Security Deposits guide.

The Commercial Eviction Process

Commercial evictions in Montana are faster and offer fewer protections than residential evictions.

• 15-Day Notice for Rent: If a commercial tenant defaults on rent, the landlord must provide a 15-Day Written Notice to cure the default, unless the lease specifies a different, shorter timeframe.
• 30-Day Notice for Other Breaches: For non-rent defaults (e.g., unauthorized alterations), a 30-day written notice to cure is the standard statutory default.
• If the tenant fails to cure within the notice period, the landlord can formally terminate the lease and pursue eviction (Unlawful Detainer).

See our Commercial Eviction Process guide.

Rent Increases and Late Fees

• Rent Increases: There is no commercial rent control in Montana. Rent escalations (such as annual percentage increases, CPI adjustments, or step-ups) are governed exclusively by the terms negotiated in the lease agreement.
• Late Fees: The residential cap on late fees (10% or $25) does not apply. Commercial landlords can enforce whatever late fee structure (flat fee plus high daily compounding interest) is codified in the lease, provided it does not cross the line into an unenforceable, punitive penalty under general contract law.

See our Commercial Rent Increases and Commercial Late Fees guides.

How Landager Helps Commercial Landlords in Montana

Because Montana relies almost entirely on the specific language of the contract rather than overarching state statutes, managing a diverse commercial portfolio means tracking dozens of completely different legal timelines simultaneously. Landager’s commercial lease abstraction engine centralizes this complexity. It digitally extracts the highly customized CAM reconciliation dates, specific security deposit return triggers, and unique NNN maintenance liabilities from every individual Montana commercial lease in your portfolio, automatically surfacing these obligations to your property management team before a deadline is missed.