High Quality Content by WIKIPEDIA articles! Tree House, also known as The Tree, is a mediaeval timber-framed house on the High Street in Crawley, a town and borough in West Sussex, England. It is the original manor house of Crawley, and was built in the early 15th century and rebuilt in the mid-16th century. It now has a modern exterior and is disused, but the old structure is still in place inside. Situated in a prominent position facing both the High Street and The Boulevard, two of Crawley town centre`s main roads, its name commemorates an ancient elm tree which stood outside for hundreds of years and was one of Crawley`s landmarks.