It is a combination of real estate taxes and the amount you paid in state and local income tax and is limited by the new tax law to $10,000. (you have to choose to deduct either sales taxes or state income tax)
State and Local Taxes
For tax year 2019 (the taxes you file in 2020), you may be able to deduct sales tax, state and local income tax, and/or property taxes capped at $10,000 ($5,000 for married filing separate) if you itemize deductions.
https://turbotax.intuit.com/tax-tips/irs-tax-return/tax-reform-changes-that-impact-your-2017-taxes/L...
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.
