Photo: Alexander Coggin for New York Magazine It is a Monday afternoon in August, and midtown is as empty as it gets all year. But Randy Mastro, the lawyer who has made himself a sharp thorn in Mayor Zohran Mamdani’s side, is in his 27th-floor office near Bryant Park. His wife and dog are on vacation, but Mastro couldn’t be busier, and he couldn’t be happier. “The only place I’m going this month,” he says with an enthusiastic growl, “is the courthouse on Staten Island.” The source of his good mood and overflowing schedule is the spate of lawsuits Mastro...