In 1679 the manor was acquired by the famous family of von Uexküll and by the 18th century they had started constructing the Baroque-styled main building.
In September 1710 the half-finished Harku Manor was used as a place to sign the capitulation contract between Russian forces and Sweden with local nobility.
Also, in the shade of trees, the barn and stables-coach shed are still standing, bordering the long front court of the main building.
Administrative buildings with high corbie-stepped gables made of limestone and a historicist abamurus with decorative towers, resembling a stronghold, are located near the entrance.
Auxiliary buildings worth seeing include the cattle complex with historicist-style gables and the ruins of a greenhouse with two towers reminiscent of a medieval castle, located in the park (both from the end of the 19th century).
A granary and a stable-coach house lining the main building’s long front square have also been preserved, although they are currently hidden by the shadows of trees.
At that time, a patch of lawn surrounded by a roundabout stood in front of the façade of the main building and terraces descended from the garden facade to the ponds.
In the main part, the park has been preserved in a more freely designed layout, which is illustrated by the loose placement of clearings and tree groups.
In the middle of the park there is a three-hectare large manor pond with five small islands and a limestone bottom.
The soil that was left over from the widening and deepening of the lake was piled up in the middle of the pond to form five islands that were decorated with various sculptures and connected with bridges.