Property tax rebate? Which state? Did you get an actual cash rebate or did you get a reduction in your amount billed?
Federal taxes..you can only claim the amount of real estate taxes that you actually paid.
State.. follow the forms. They will allow you to claim any credits due.
Disclaimer: Not a tax professional. Information gathered from internet links. Anything dated in June 2019 was posted in prior years and is before the 2019 limits and changes.