Kolu (German: Kollo) estate dates from 1639, when it was founded by Peter Grote. The Baltic German Grote (later Grotenhielm) family owned the property until 1875, after which it switched hands a few times before becoming a school in the 20th century. It is today private property. The main building was built 1888-1890 and designed by architect Erwin Bernhard. In 1905, after being devastated during riots during the Revolution of 1905, a corner tower was added to the building.