(1) For property tax years beginning after 2006, the fair market value of real property is its fair market value applicable for the later of:
(a) the base year, as defined in subsection (C) of this section;
(b) when an assessable transfer of interest has occurred;
(c) as determined on appeal; or
(d) as it may be adjusted as determined in a countywide reassessment program conducted pursuant to Section 12-43-217, but limited to increases in such value as provided in subsection (B) of this section.
(2) To the fair market value of real property as determined at the time provided in item (1) of this subsection, there must be added the fair market value of subsequent improvements and additions to the property.
(B) Any increase in the fair market value of real property attributable to the periodic countywide appraisal and equalization program implemented pursuant to Section 12-43-217 is limited to fifteen percent within a five-year period to the otherwise applicable fair market value. However, this limit does not apply to the fair market value of additions or improvements to real property in the year those additions or improvements are first subject to property tax, nor do they apply to the fair market value of real property when an assessable transfer of interest occurred in the year that the transfer value is first subject to tax.
(C) For purposes of determining a "base year" fair market value pursuant to this section, the fair market value of real property is its appraised value applicable for property tax year 2007.