Andrea Raila, a longtime property tax consultant who ran for assessor last year, said she pushed for the 2011 change in part because clients of hers were hit with back taxes for as far back as a decade in cases when they were unaware their valuations should have been higher. She cited an example of a client who built new garages on his commercial property, didn’t realize they should have increased his assessed value and was hit with a whopping tax bill he couldn’t afford.