Brigitte Goldenberg of Sotheby's International realty

Upper East Side real estate moves at a pace most neighborhoods can’t match. Deals close quickly, listings shift overnight, and the right agent makes all the difference. Brigitte Goldenberg of Sotheby’s International Realty operates from 650 Madison Avenue, a stretch where pre-war co-ops and glassy new developments share the same block. They handle everything from townhouse sales to high-rise rentals, and their services also cover market analysis, staging guidance, and off-market introductions. The office identifies as women-owned, a detail that resonates in a field still dominated by traditional brokerages. Madison Avenue’s midtown energy keeps the phone ringing—(917) 593-1137—so buyers and sellers can reach out without delay. Whether you’re downsizing from a Fifth Avenue duplex or hunting for your first studio, the map for directions is here: 650 Madison Ave on Google Maps. If the address sounds familiar, it’s because you’ve probably walked past it on the way to lunch at Sant Ambroeus.