Colo. Rev. Stat. § 29-4-119
No interest of the city in any housing project shall be subject to sale by the foreclosure of a mortgage thereon either through judicial proceedings or the exercise of a power of sale contained in such mortgage except in the case of mortgages not provided for in section 29-4-115. No judgment against a city shall be a charge upon the real or personal property of the city. The provisions of this section shall not apply to nor limit the rights of obligees to foreclose any of the mortgages of the city provided for in section 29-4-115, or to enforce any pledges or rights conferred by any contract, trust indenture, mortgage, lease, or other agreement of the city relating to a housing project by any appropriate suit, action, or proceeding.
C.R.S. § 29-4-119