Many property owners received a notice in March that their assessment would be going up. These are called "impact notices." Many are due to a revaluation in the overall assessments when the Equalization Rate drops below 100% and needs to be updated back to 100%. It can also happen when the Real Estate Market trends upward for certain types of properties.
Assessors will hold "informal meetings" for property owners to discuss their assessments. If you don't hear from your assessor, call him or her to ask for an informal meeting appointment. It is your right to be heard.