Colo. Rev. Stat. § 38-33.3-222
In a common interest community, if the right is originally reserved in the declaration, the declarant, in addition to any other development right, may amend the declaration at any time during as many years as are specified in the declaration to add additional real estate to the common interest community without describing the location of that real estate in the original declaration; but the area of real estate added to the common interest community pursuant to this section may not exceed ten percent of the total area of real estate described in section 38-33.3-205 (1)(c) and (1)(h), and the declarant may not in any event increase the number of units in the common interest community beyond the number stated in the original declaration pursuant to section 38-33.3-205 (1)(d), except as provided in section 38-33.3-217 (4).
C.R.S. § 38-33.3-222