As Anna Brocco suggests, start by contacting the assessor's office. The key deciding factors for determining whether real estate assessments go down, stay the same, or increase are: (1) the effective date for the reassessment (e.g., January 1, 2014); and (2) the time frame that assessment office studies to estimate assessed values for that effect date of revaluation (e.g., one, two or three years PRIOR to July 1, 2013). Assessor always use historical sales that they qualify as indicators of market value and need to cut off the sale study period about 6 months before the completion date in order to value ALL properties in their community. Even using mass-appraisal techniques, it takes a big time effort to completely revalue all properties. As long as all properties are valued using the same effect date of value and study period for sales, the appeal boards consider this to be fair and equitable treatment.