Does the city ever assume responsibility for hazardous sidewalks?

106 Canal St. is one block from North Station and passed by hundreds of commuters daily. This patch (photo today) has not been cleared all winter and is currently a sheet of ice. Multiple citations visible. At what point does the city take steps to remove a known and persistent safety hazard. Can they clear the snow and bill the owner?

106 Canal St. is one block from North Station and passed by hundreds of commuters daily. This patch (photo today) has not been cleared all winter and is currently a sheet of ice. Multiple citations visible. At what point does the city take steps to remove a known and persistent safety hazard. Can they clear the snow and bill the owner?