Colo. Rev. Stat. § 3-1-106
When the governor of this state shall be advised by the attorney general of the United States or the attorney of the United States for the district of Colorado, that a valid title to the said land for the site of such building has vested in the United States, the said governor shall make, execute, and deliver to the United States of America, a deed, sealed with the great seal of the state of Colorado, and attested by the secretary of state thereof, whose duty it shall be to attest the same, containing apt, meet, and proper words, clauses, and covenants to fully cede, give, grant, transfer, confer, and confirm such jurisdiction unto the United States of America; but nevertheless therein reserving to this state, jurisdiction for the purposes mentioned in section 3-1-105; and at, from, and after the making, executing, ensealing, attesting, and delivery of such deed, such exclusive jurisdiction shall vest and remain in the United States of America for and during all the time that the United States shall remain the owner of said tract, subject only to the right and jurisdiction for the service and execution of process in sections 3-1-105 to 3-1-107 expressly reserved to this state.
C.R.S. § 3-1-106