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Colorado's HB 1121 strengthened tenant protections across the board, including for lease violation notices. For curable violations, tenants must be given a reasonable opportunity to remedy the breach before you can file for eviction.
Curable violations: Unauthorized pet, unapproved occupant, failure to maintain the unit. Tenant must be given reasonable time to cure — typically 10 days is considered reasonable in Colorado.
Incurable violations: Criminal activity, substantial property damage, threats to other residents. Landlord may serve an unconditional notice to quit.
If the same violation recurs within 6 months of a prior notice, Colorado courts generally allow an unconditional notice to quit for the repeat violation.
Not legal advice.