Colo. Rev. Stat. § 29-4-231
All contracts, agreements, obligations, and undertakings of such housing authorities entered into prior to May 17, 1939, relating to financing or aiding in the development, construction, maintenance, or operation of any housing project, or to obtaining aid therefor from the United States housing authority including, without limiting the generality of the foregoing, loan and annual contributions contracts with the United States housing authority, agreements with municipalities or other public bodies, including those which are pledged or authorized to be pledged for the protection of the holders of any notes or bonds issued by such housing authorities or which are otherwise made a part of the contract with such holders of notes or bonds relating to cooperation and contributions in aid of housing projects, payments, if any, in lieu of taxes, furnishing of municipal services and facilities, and the elimination of unsafe and unsanitary dwellings, and contracts for the construction of housing projects, together with all proceedings, acts, and things undertaken, performed, or done prior to May 17, 1939, with reference thereto, are validated, ratified, confirmed, approved, and declared legal in all respects, notwithstanding any want of statutory authority or any defect or irregularity therein.
C.R.S. § 29-4-231