Official Law Citation: The commercial eviction and Unlawful Detainer process is codified in Montana Code Annotated Title 70, Chapter 27.

In Montana, commercial evictions are generally more straightforward and faster than residential evictions. Because the state views commercial leases as contracts between sophisticated business entities, courts overwhelmingly defer to the agreed-upon terms regarding default and eviction.

If the lease is silent on eviction notice periods, the statutory defaults in Montana law take effect.

1. Defining Default and the Notice to Cure

Before a landlord can initiate an eviction (file an Unlawful Detainer action) in a Montana court, they must serve the commercial tenant with a formal written notice detailing the breach and providing a legally required period to fix ("cure") the issue.

Statutory Default: The 3-Day Notice

If the lease does not specify a different notice period, Montana law provides a uniform statutory default for all commercial lease breaches (MCA § 70-27-108):

Default on Rent

If a commercial tenant fails to pay rent, the landlord must provide a 3-Day Written Notice to Pay or Quit.

• The tenant has 3 days from receipt to pay in full.
• If they fail to pay, the landlord can initiate an Unlawful Detainer action immediately.

Default on Other Covenants

For non-monetary breaches (e.g., insurance, alterations, or permitted use violations), the statutory default is also a 3-Day Written Notice to Perform or Quit.

• The tenant has 3 days to either cure the breach or vacate.
• If the breach is incurable (e.g., a one-time prohibited event), the notice demands immediate possession.

Lease Supremacy: While the 3-day period is the statutory default, commercial leases in Montana frequently specify different timelines or provide for "grace periods." The terms of the signed lease will generally override these defaults.

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2. Filing the Unlawful Detainer

If the notice period expires and the tenant has neither paid the rent nor vacated the property (becoming a "holdover tenant"), the landlord's next legal step is filing a formal complaint for Unlawful Detainer in the appropriate Montana District Court.

• Self-Help Eviction is Highly Risky: Unlike some states that still recognize common-law "peaceable re-entry" (changing the locks in the middle of the night) for commercial properties, attempting a self-help eviction in Montana without a court order is exceptionally dangerous and frequently results in the landlord being successfully countersued by the commercial tenant for wrongful eviction and massive business disruption damages. Formal court action is the only safe route.

3. The Hearing and Writ

The court will schedule a hearing. If the judge rules in favor of the landlord (usually due to a clear, documented breach of the lease), the court will issue a judgment granting the landlord possession of the property.

If the tenant still refuses to leave, the landlord must take the court order to the local County Sheriff, who will execute the writ and physically remove the tenant and their business property from the premises.

4. Duty to Mitigate Damages In Montana commercial real estate, if a tenant breaks the lease early or is evicted for non-payment, the landlord cannot simply sit back, leave the retail unit vacant for the remaining three years of the lease, and continuously sue the tenant for the lost rent.

Montana law imposes a strong duty to mitigate damages on the landlord. The landlord must make a reasonable, good-faith effort to find a replacement commercial tenant for the space. If the landlord successfully re-leases the space, the original, evicted tenant's liability is reduced by the amount of the new rent collected.

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How Landager Helps

Landager tracks lease terms, payment deadlines, and important communications - making it easy to stay compliant with Montana regulations.

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