Yes he has properties in Westchester (and one of his residences, Granite Springs, is in Bedford), but he clearly wasn't referring to that.
Sorry, he simply misspoke. Not a big deal.
See? Misspeaking is easy. Trump's residence is not Granite Springs, it's Seven Springs.
http://bedford.dailyvoice.com/politics/presidential-run-puts-spotlight-on-trumps-bedford-estate/553288/