Mayor Zohran Mamdani’s threat to raise property taxes by nearly 10% could end up alienating support from his own base, according to a new poll exclusively shared with The Post. Ten in-depth interviews conducted with Mamdani voters by firm J.L. Partners found that higher taxes on the wealthy and corporations are the number one conditional policy that Mamdani needs to deliver on or else they will retract their support. “I do think property tax is a real risk for Mamdani: both with his own base