KXII’s COL changed in 1992.
They built the Sherman studio in 1960. According to the doc filed with the FCC for changing COL, Sherman has been considered the main studio since 1966.
The station was originally an NBC affiliate. They added a secondary affiliation with CBS in 1960. In ‘74, CBS became the primary affiliation and in ‘85 KXII became CBS exclusive.
(I worked at KXII and KLTV, so this listing was nice to see.)