The property tax provisions were a demand from rural lawmakers reluctant to provide more than $1 billion in tax support for professional sports teams. The lawsuit contends the portions of the bill containing the property tax caps and freezes violate the Missouri Constitution. The Missouri State Tax Commission grades each county on how close its residential and commercial property assessments are to market value. It pressures counties that lag into updating the values, which can bring unwelcome and surprising increases in property tax bills. Much of Wednesday’s arguments focused on the fine details of state tax law and how taxes are governed under the Constitution.