It might also be possible that the information you received from the town did not deduct the STAR or any other exemptions. Some agents will show the net taxes after the exemptions, even though they should report the gross amount or disclose the exemption.
When representing buyers I will always verify taxes with the town as soon as my client indicates they want to make an offer. This way the buyer is making a fully informed decision.
Best of luck!
So homebuyers be aware, tax numbers can difficult to nail down at present, and impossible to predict if the assessed value is currently significantly higher than the actual sale price.