The GT city council nor the voters would OK an increase to taxes. For that would lead to every incumbant being kicked out of office their next election.
Regular taxes and special assessments collected as taxes.. It applies to everything new. The City Council/City Redevelopment Agency is not raising taxes (as per their brochure), but adding on a special assessment collected as a tax. That is quite different, and as you found out now, you still have to pay (for their errors in judgement).
In Riverside county, the Special Assessments often exceed the basic taxes for your property.