Mr. Mamdani’s resounding victory showed that, in this election at least, the city’s business elites were not calling the shots. New York City’s business leaders spent more than $25 million on efforts to defeat Mr. Mamdani. Undaunted, some of them are already thinking about how they could blunt his most liberal initiatives, turning their attention to Albany, which has the power to block many of his proposals, like raising corporate taxes.