That “Selling New York” stars Tom Postilio and Mickey Conlon are hosting the Bailey House Gala & Auction Thursday at Pier 60, Chelsea Piers. Honorees include the late Jason Sheftell, former real estate correspondent for the Daily News, who before that was a freelancer for NYP Home … that Nest Seekers International and its broker Ryan Serhant are hosting a party to celebrate the premiere of Season 3 of “Million Dollar Listing New York” at Lavo next Tuesday, April 1 … that Lenox Hill Hospital will be hosting its first inaugural Designer Show House of New York, in support of the new Lenox Hill HealthPlex now under construction in Greenwich Village. The show house, which debuts in May, will be at The Residences at W New York-Downtown, at 123 Washington St., with Richard Mishaan and Alexa Hampton as the co-design chairs.