C.R.S. § 3-1-104: When jurisdiction vests - tax exemption.

The jurisdiction ceded shall not vest until the United States shall have acquired the title to the said lands by purchase, condemnation, or otherwise; and so long as the said lands shall remain the property of the said United States when acquired and no longer, the same shall be and continue exempt and exonerated from all state, county, and municipal taxation, assessment, or other charges which may be levied or imposed under the authority of this state.