Castlebrook Apartments, New Castle, DE, 19720. Bedrooms: 1-2. Welcome to CastleBrook Apartments! Our beautifully maintained community is nestled within 34 acres in a fabulous residential setting. Spacious floorplans, reasonable rents and a refreshing blend of town and country living along with superior customer service is what sets us apart from the rest. Relax this summer by our sparkling pools or take advantage of our tennis courts and get in a great work-out! We are centrally located and close to Wilmington, Newark and Christiana. We are also convenient to Philadelphia, Atlantic City and the Delaware Beach Resorts. Castlebrook Apartments has the perfect home for you-visit us today!