The increase in building value due to rehabilitation, renovation, or replacement must be 25% or more of the assessed value before any work is done. Residential structures must be at least 15 years old and increase in size by no more than 30%. Commercial/industrial structures must be at least 20 years old and increase in size no more than 100%. Hotel or motel structures must be at least 35 years old and increase in size by no more than 100%. Rehabilitation must be completed by December 31 of the third calendar year after the application was submitted. The application and $50 non-refundable application fee must be submitted after you obtain appropriate building permits, but before any work is started. Taxes must be kept current to qualify and remain in the program. All work must conform to existing building and zoning regulations.