Karen Kostiw

Karen Kostiw advises buyers, sellers, and estate representatives throughout Manhattan, combining Wall Street financial expertise with decades of local market knowledge. Before entering residential real estate, Karen built a successful career analyzing residential mortgage-backed securities and managing institutional client relationships, experience that continues to inform her analytical approach to valuation, negotiation, and transaction strategy.

Whether representing a luxury resale, estate sale, new development purchase, or investment property, Karen helps clients navigate complex decisions with clarity and confidence. Known for her project-management approach, she coordinates every aspect of a transaction, from pricing and due diligence to attorneys, lenders, contractors, and design professionals, ensuring a seamless experience from contract to closing.

Karen is valued for her ability to balance the financial and emotional aspects of real estate. She believes successful transactions are built on trust, transparency, communication, and thoughtful guidance tailored to each client's unique circumstances and goals.

A longtime Manhattan resident and Chelsea homeowner, Karen brings extensive knowledge of New York City's neighborhoods, buildings, and market dynamics. Through Christie's International Real Estate New York, she combines personalized boutique service with the global reach of one of the world's most recognized luxury real estate brands and access to an international network of clients and referral partners.

Karen's market expertise has been featured in The New York Times, The Wall Street Journal, The Real Deal, Realtor.com, StreetEasy, Apartment Therapy, Brick Underground, and Martha Stewart.