Mamdani extends pied-à-terre tax deadline — while admitting 1,200 New Yorkers were notified by mistake

The Mamdani administration admitted it mistakenly told more than 1,000 New Yorkers that they could get hit with a pied-à-terre tax bill unless they proved otherwise, according to new court documents. City attorneys, in the Tuesday filings, also revealed they were extending the deadline for targeted property owners to apply for an exemption to October...