This would be listed as property taxes paid.
This is from the IRS instructions for the 1098: Page 6 of this link, https://www.irs.gov/pub/irs-prior/i1098--2017.pdf
"Box 11. Other Enter any other item you wish to report to the payer, such as real estate taxes, insurance paid from escrow, or, if you are a collection agent, the name of the person for whom you collected the interest. "
