Colo. Rev. Stat. § 29-4-601
For the purposes of this part 6, there shall be excluded from the term "project" or "housing project" any such project where there is in existence on or after October 1, 1963, a contract for financial assistance between any city, city and county, authority, housing authority, or county housing authority, and the federal government in respect to such project. Notwithstanding any other provisions of this part 6, no vote of the registered electors shall be required in order to make expenditures for preliminary surveys and planning of projects or housing projects, or in order to authorize the reconstruction, replacement, restoration, or remodeling of any project or housing project, or part thereof, which has deteriorated or become damaged or destroyed, from any cause, nor shall such vote be required in order to authorize the acquisition of land for or the construction or erection of such service building, structures, or facilities as may be necessary or convenient for the efficient and proper operation or management of any authorized project or housing project.
C.R.S. § 29-4-601