Colo. Rev. Stat. § 31-25-817
The governing body may impose and levy an ad valorem tax on all real and personal property in the downtown development district not exceeding five mills on the valuation for assessment of such property for the purposes set forth in section 31-25-807, nondebt funded expenditures allowed under section 31-25-808(1)(a) and (1)(b), and budgeted operations of the authority. This levy shall be in addition to the regular ad valorem taxes and special assessments for improvements imposed by the governing body. The tax collector shall transmit funds so collected to the appropriate officer of the municipality responsible for the handling of the public money who shall deposit same in the municipal treasury to the credit of the authority. Such funds shall be used for no purpose other than those purposes authorized by this part 8 and upon approval of the board, pursuant to vouchers signed by the designated officer of the authority. The funds of the authority shall be secured as other public funds are secured. Other moneys received by the authority shall forthwith be deposited in the municipal treasury to the credit of the authority, subject to disbursement as authorized by this part 8.
C.R.S. § 31-25-817