In the Middle Ages, Westmalle belonged to the Duchy of Brabant and was ruled by a mayor. The castle of Westmalle started as Hof ten Driesche in the year 1100 as a residence for the Meiers. In 1561, the old Hof ten Driesche was converted into a noble castle by the de Cotereau family. In the 17th century, the park was embellished and a maze was created, so that the castle became a home of Playsantie. The castle then had the appearance of a fortified castle with a monumental gate, double walls, drawbridge and forecourt. The castle remained within the De Cotereau family for several generations, until there was no male heir left. In the 18th and 19th centuries, the castle had several owners.
East of the castle is a circular service building with a cone-shaped roof. The round construction is unique, and was probably built in 1841. After all, we find few buildings of this nature in our country. The origin and initial destination of this building remain a mystery.
In 1878 it was bought by Baron Emile de Turck de Kersbeek, who restored the castle and converted it into the current appearance. To do this, he hired Antwerp architect J. Schadde, who also designed the Antwerp Stock Exchange and the railway station in Bruges. He completely restored the castle in the old style.
In 1914, Baron Alphons van der Straten Waillet inherited the castle. In 1973, the castle passed to his fourth son, Baron Jacques van der Straten Waillet. In 1977, the castle, which perfectly preserved its appearance of 1561, was classified as a protected monument.