C.R.S. § 38-12-1203

(1) On and after January 1, 2021, except as otherwise provided in this section or required by law or court order, a landlord shall not: (a) Demand, request, or collect information regarding or relating to the immigration or citizenship status of a tenant; except that a landlord that is also the tenant’s employer may lawfully collect information required to complete any employment form required by state or federal law; (b) Disclose or threaten to disclose information regarding or relating to the immigration or citizenship status of a tenant to any person, entity, or immigration or law enforcement agency; (c) Harass or intimidate a tenant or retaliate against a tenant for: (I) Exercising the tenant’s rights under this part 12; or (II) Opposing any conduct prohibited by this part 12; (d) Interfere with a tenant’s rights under this part 12, including influencing or attempting to influence a tenant to surrender possession of a dwelling unit or to not seek to occupy a dwelling unit based solely or in part on the immigration or citizenship status of the tenant; (e) Refuse to enter into a rental agreement or to approve a subtenancy, or to otherwise preclude a tenant from occupying a dwelling unit, based solely or in part on the immigration or citizenship status of the tenant; or (f) Bring an action to recover possession of a dwelling unit based solely or in part on the immigration or citizenship status of a tenant.