Rare duplex opportunity in one of Haddon Heights’ most convenient locations just a few homes from the Haddonfield border and directly next to the school. 401 Crest Avenue offers flexibility, income potential, and long term upside in a highly desirable setting. The property is currently configured as a two-unit residence, with each unit offering 2 bedrooms, 1 full bathroom, a kitchen, and a spacious living room. The first floor unit is currently vacant, while the upstairs tenant is month to month, giving the next owner immediate flexibility. Current rent is $2,000/month per seller, with strong upside potential due to the vacant lower unit, month to month tenancy, and prime location. Buyers can explore multiple paths: continue as an income producing duplex, live in one unit while renting the other, lease both units at market rent, or investigate a possible conversion back to a single family home. The home features a classic brick exterior, strong curb appeal, driveway parking, a side screened porch, bright interior spaces, hardwood flooring in the first floor living area, generous room sizes, shared basement laundry, designated storage areas, and shared shed storage. The property has also seen numerous important improvements over the years, including gable siding, roof replacement, AC compressor replacement, hot water heater, appliance updates, plumbing upgrades, upstairs carpet replacement, and exterior trim painting. Additional highlights include gas hot water radiator heat, gas cooking, two electric meters, and completed NJ lead paint testing with lifetime approval/report available. Outstanding location near Haddonfield, schools, parks, shopping, downtown Haddon Heights, and major commuter routes. Buyer responsible for verifying zoning, permitted use, rental requirements, lease terms, and any potential single family conversion.