C.R.S. § 32-11-701
32-11-701. Annexation of lands to district
32-11-701. Annexation of lands to district. (1) The territorial limits of the urban district may be enlarged by the annexation of additional real property thereto in the following ways:
(a) By petition and consent of the fee owner pursuant to sections 32-11-702 and 32-11-706;
(b) By petition of the taxpaying electors, and approval pursuant to sections 32-11-703, 32-11-704, and 32-11-706; and
(c) By action initiated by the urban district pursuant to sections 32-11-705 and 32-11-706.