In 1978, California voters passed Proposition 8, which amended the California Constitution to allow a temporary reduction in assessed value when the market value of a property has fallen below its factored base year value as of the January 1 lien date (a “Prop. 8 Reduction”). Because residential properties change hands much more frequently, California Assessors have access to enough information to understand what the market value of a residential property is for purposes of reviewing applications for Prop. 8 Reductions.