Boston Mayor Michelle Wu is urging a reluctant state Senate to act on the contentious tax shift legislation she’s been pushing for nearly two years, in light of city data that shows homeowners are facing an “unsustainable” 13% tax increase next year.

Insisting that there is no other option, Wu and her allies urged senators to “put all the other silly stuff aside” — as Boston Police Patrolmen’s Association President Larry Calderone put it — and pass stalled legislation that would provide residential tax relief by shifting more of the city’s tax burden onto commercial property owners for a three-year period, before property tax bills go out in the next few weeks.

Without the legislation, Wu said the average-single family homeowner will see a $780, or 13% increase, next year — based on a po

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