Minor swings in real estate assessments are fairly common, but one torpedoed Mayor Wu’s high-profile push to boost commercial property tax rates.

In a major escalation of the controversy surrounding Boston Mayor Michelle Wu’s defeated commercial tax hike plan, a Boston city councilor is asking the state Inspector General to step in and potentially investigate why Wu provided “outdated and inaccurate” tax assessing data to the council and state Legislature to try and win over elected officials.