Colorado Code
Article 1 - General Provisions
§ 39-1-104. Valuation for Assessment - Definitions

(1.5) Repealed.

(10.3) Repealed. (11) (a) (I) It is the intent of the general assembly, as manifested in subsection (10.2) of this section, that, when a change occurs in reassessment cycles as prescribed in said subsection, new manuals and associated data will be published by the administrator, pursuant to section 39-2-109 (1)(e) , and that said manuals and associated data and the level of value for the year that said manuals and associated data are published shall be utilized by assessors in the manner described in subsection (10.2) of this section for determining the actual value of real property in each county of the state. (II) The general assembly hereby further finds and declares that it is the intent of paragraph (b) of this subsection (11) to comply with the provisions of section 3 of article X of the state constitution, including the provision which requires the enactment of "general laws, which shall prescribe such methods and regulations as shall secure just and equalized valuations for assessments of all real and personal property"; to reduce the confusion of the owners of taxable property within the state concerning assessment procedures and valuations of such property; to achieve valuations for assessment which represent the current value of such property to the extent which is equitably and practically possible; and to minimize the costs associated with achieving such current valuations for assessment. (b) (I) The provisions of subsection (10.2) of this section are not intended to prevent the assessor from taking into account, in determining actual value for the years which intervene between changes in the level of value, any unusual conditions in or related to any real property which would result in an increase or decrease in actual value. If any real property has not been assessed at its correct level of value, the assessor shall revalue such property for the intervening year so that the actual value of such property will be its correct level of value; however, the assessor shall not revalue such property above or below its correct level of value except as necessary to reflect the increase or decrease in actual value attributable to an unusual condition. For the purposes of this paragraph (b) and except as otherwise provided in this paragraph (b), an unusual condition which could result in an increase or decrease in actual value is limited to the installation of an on-site improvement, the ending of the economic life of an improvement with only salvage value remaining, the addition to or remodeling of a structure, a change of use of the land, the creation of a condominium ownership of real property as recognized in the "Condominium Ownership Act", article 33 of title 38, C.R.S., any new regulations restricting or increasing the use of the land, or a combination thereof, the installation and operation of surface equipment relating to oil and gas wells on agricultural land, any detrimental acts of nature, and any damage due to accident, vandalism, fire, or explosion. When taking into account such unusual conditions which would increase or decrease the actual value of a property, the assessor must relate such changes to the level of value as if the conditions had existed at that time. (II) The creation of a condominium ownership of real property by the conversion of an existing structure shall be taken into account as an unusual condition as provided for in subparagraph (I) of this paragraph (b) by the assessor, when at least fifty-one percent of the condominium units, as defined in section 38-33-103 (1) , C.R.S., in a multiunit property subject to condominium ownership have been sold and conveyed to bona fide purchasers and deeds have been recorded therefor. (c) Repealed. (12) (a) For the property tax years commencing on or after January 1, 1987, producing mines shall be valued for assessment solely pursuant to article 6 of this title. (b) For the property tax years commencing on or after January 1, 1987, oil and gas leaseholds and lands shall be valued for assessment solely pursuant to section 39-7-102 . (c) Repealed.
(12.1) Repealed.

(12.4) For property tax years commencing on and after January 1, 1987, the requirement stated in subsections (10.2) to (11) of this section that the actual value of real property be determined according to a specified year's level of value and manuals and associated data published by the administrator for said specified year pursuant to section 39-2-109 (1)(e) shall not apply to the assessment of producing coal mines and other lands producing nonmetallic minerals. (13)Repealed. (14)Repealed. (15) Repealed. (16) (a) During each property tax year, the director of research of the legislative council shall contract with a private person for a valuation for assessment study to be conducted as set forth in this subsection (16). The study shall be conducted in all counties of the state to determine whether or not the assessor of each county has, in fact, used all manuals, formulas, and other directives required by law to arrive at the valuation for assessment of each and every class of real and personal property in the county. The person conducting the study shall sample each class of property in a statistically valid manner, and the aggregate of such sampling shall equal at least one percent of all properties in each county of the state. The sampling shall show that the various areas, ages of buildings, economic conditions, and uses of properties have been sampled. Such study shall be completed, and a final report of the findings and conclusions thereof shall be submitted to the state board of equalization, by September 15 of the year in which the study is conducted. (b) During each property tax year, beginning with the property tax year which commences January 1, 1985, in addition to the requirements set forth in paragraph (a) of this subsection (16), the study shall set forth the aggregate valuation for assessment of each county for the year in which the study is conducted. (c) The person conducting any valuation for assessment study pursuant to this subsection (16) and his employees shall, during the term of his contract, have access to any document in the custody of the administrator or an assessor, including, but not limited to, such documents as are held pursuant to sections 39-4-103 , 39-5-120 , and 39-14-102 (1)(c) . The penalties in section 39-1-116 apply against the divulging at any time of any confidential information obtained pursuant to this paragraph (c). (d) Repealed.

Source: L. 64: R&RE, p. 676, § 1. C.R.S. 1963: § 137-1-4. L. 65: p. 1096, § 2. L. 67: p. 946, § 5. L. 70: pp. 380, 388, §§ 10, 28. L. 73: p. 1430 § 1. L. 75: (5) and (6) added, pp. 863, 1474, §§ 2, 1, effective July 1; (7) added, p. 1454, § 1, effective July 30. L. 76: (9) added, p. 755, § 5, effective July 1; (8) added, p. 755, § 4, effective January 1, 1977. L. 77: (10) R&RE and (11) and (12) added, pp. 1731, 1732, §§ 4, 5, effective June 20. L. 79: (13) added, p. 1329, § 2, effective May 8; (6) R&RE and (14) added, pp. 1403, 1327, §§ 1, 4, effective July 1; (2) amended, p. 1402, § 1, effective January 1, 1980. L. 80: (10) amended, p. 714, § 1, effective February 29; (9) amended, p. 711, § 1, effective April 16. L. 81: (13)(b) amended, p. 1836, § 1, effective June 4; (9)(a), (10)(a), (10)(b), and IP(12) amended, p. 1830, § 2, effective June 12; (12)(c), (12)(d), (12)(g), and (12)(h) amended, pp. 1848, 1854, §§ 4, 2, effective January 1, 1982; (16) added, p. 1397, § 8, effective January 1, 1983. L. 82: (11)(b) amended, p. 553, § 1, effective May 3; (16) amended, p. 457, § 2, effective January 1, 1983. L. 83: (2), (7), and (12.3)(b) repealed and (12.3)(a)(I) and (16) amended, pp. 1485, 1482, §§ 11, 3, effective April 22; (10), (11)(a), (11)(b)(I), and (12)(h) amended and (10.1), (12.1), and (12.2) added, pp. 1494, 1495, §§ 1, 2, effective April 28; (5) repealed, p. 2081, § 1, effective January 1, 1984. L. 84: (15) repealed, p. 999, § 3, effective January 1; (10), (10.1)(a), (12)(h), (12.1), IP(12.2)(a), and (12.2)(b) amended, p. 988, § 1, effective February 23. L. 85: (4) amended, p. 1212, § 8, effective May 9. L. 86: (16)(a) amended, p. 1101, § 1, effective March 26. L. 87: (16)(c) added, p. 1417, § 1, effective March 13; (12)(a) RC&RE and (12.2)(a) amended, p. 1390, §§ 1, 2, effective April 1; (12)(b) RC&RE and (12.2)(a) amended, p. 1392, §§ 1, 2, effective April 1; (1.5) added, p. 1384, § 1, effective April 16; (6), (13), and (14) repealed, p. 1304, § 1, effective May 20; (9)(a), (9)(b), and (10) repealed, (10.1) R&RE, (11)(b)(I) and (12.2)(a) amended, and (12)(c) and (12.4) added, pp. 1388, 1386, 1385, §§ 6(1), 3, 1, 5, 2, effective June 20; (1) amended, p. 1383, § 1, effective July 10; (10.3) added, p. 1387, § 4, effective January 1, 1991; (9)(d) and (11)(c) added by revision, p. 1388, § 6(2). L. 88: (8) repealed, (9)(c), (9)(d), (10.1)(b), (10.3)(a), (11)(a), (11)(b)(I), (11)(c), and (12.3)(a) amended, (10.1)(d) R&RE, and (10.2) added, pp. 1275, 1269, 1273, 1270, §§ 14, 5, 6, 5, effective May 29; (1.5) R&RE, (16)(c) amended, and (16)(d) added, pp. 1279, 1282, §§ 2, 5, effective January 1, 1989; L. 89: (11)(b)(I) amended, p. 1450, § 2, effective June 7; (10.3)(c) amended, p. 1644, § 8, effective January 1, 1991. L. 90: (16)(d) repealed, p. 1840, § 19, effective May 31; (12)(c) repealed and (16)(a) and (16)(c) amended, pp. 1705, 1689, §§ 41, 4, effective June 9. L. 91: (10.2)(c), (10.3)(a), (11)(a)(I), (11)(b)(I), and (12.4) amended and (10.2)(e) and (11)(c) repealed, pp. 2003, 2005, §§ 1, 5, effective June 6. L. 92: (11)(b)(I) amended, p. 2212, § 10, effective June 3. L. 93: (7) repealed, p. 1689, § 8, effective June 6. L. 94: (11)(b)(I) amended, p. 309, § 1, effective March 22. L. 95: (10.2)(c) and (10.3) repealed, p. 7, § 1, effective March 9. L. 96: (11)(a)(I), IP(12.2)(a), (12.3)(a)(I), and (12.4) amended, pp. 1198, 1199, §§ 1, 2, effective June 1. L. 99: (10.2)(d) amended, p. 202, § 1, effective August 4. L. 2002: (16)(a) amended, p. 861, § 1, effective August 7. L. 2005: (IP)(12.2)(a) amended, p. 781, § 72, effective June 1. L. 2020: (1.5) repealed, (SB 20-223), ch. 291, p. 1436, § 2, effective January 1, 2021. L. 2021: (1) and (4) amended and (1.6) and (1.8) added, (SB 21-293), ch. 301, p. 1806, § 2, effective June 23; (12.3)(a)(I) amended, (HB 21-1312), ch. 299, p. 1792, § 5, effective July 1.

FOR: : 1,740,395
AGAINST: : 1,285,136
Cross references: (1) For constitutional provisions concerning taxation, see article X of the state constitution; for the provision that sets the valuation for assessment of residential real property at 21%, see § 3 (1)(b) of article X of the state constitution.
(2) For the legislative declaration in HB 21-1312, see section 1 of chapter 299, Session Laws of Colorado 2021.