40 Dean Drive offers approximately 4,300 square feet of newly expanded and renovated living space on nearly 16,000 square feet in a prime Tenafly location. This 5 BR, 4.1 BTH is designed for comfort, efficiency, and everyday functionality. Energy conscious features include closed-cell spray foam insulation in the roof assembly, Pella windows throughout, a whole-house water filtration system with dedicated drinking water filtration, and a premium hydronic heating system with a gas fired boiler and Pensotti panel radiators. Zoned split system air conditioning with heat pumps provides individual room temperature control. The main level features an open, practical layout with engineered hardwood flooring, a spacious kitchen with abundant cabinetry, and an electric fireplace in the living room. Motion sensor faucets add convenience in the kitchen and powder room. The primary suite includes soaring ceilings, large windows on two sides, and open neighborhood views. Additional bedrooms include a unique bi level children's room and a junior suite with generous storage and garden views. The finished basement adds high ceilings, awning windows for natural light and ventilation, and a full bath with steam sauna. Outdoors, enjoy a private rear yard bordered by a wooded hillside with a seating area, built in fire pit and fenced vegetable garden. The front of the home faces a neighborhood park and trail, with convenient access to schools, downtown, parks and houses of worship.