NYS Property Tax Relief

Taxpayer, a New York homeowner, received a check captioned "Property Tax Relief" (not "refund" or "rebate") and dated 8 Jan 2018. There's
no indication of it being tied specifically to taxes paid in 2016 or 2017.
Question: how is this handled for Federal tax purposes?
If this were a refund of state income tax, it would be added to 2018 income as "other income". Is it the same for property tax relief (not "refund")? Or does this just reduce the deduction for 2018 property taxes?
Taxpayer itemized deductions for 2016 and 2017, but will take standard deduction for 2018.
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Stan Brown, Oak Road Systems, Tompkins County, New York, USA
http://BrownMath.com/
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