By Nathaniel Meyersohn, CNN New York (CNN) — Real estate developers spent millions to stop Zohran Mamdani from becoming New York City’s mayor, claiming his policies would destroy the city. Mamdani wants their help. Mamdani was elected on a platform of rent freezes and government-backed housing, proposing a $100 billion plan during the campaign to create a Vienna-style social housing model. But his new $22 billion plan to get New York City out of…