Hall County real estate assessments jumped $275 million in 2017, and county leaders would need to roll back the tax rate almost 4 percent to stay even with last year’s numbers. The unofficial 2017 tax digest shows a $500 million increase, including the reassessments, $211 million in new construction and $85 million in personal property, which is mostly boats. The digest, valued now at $7.3 billion, is the total of all taxable property in the county.