The construction of Villa Rosenberg dates back to the beginning of the 20th century. The three-storey building in heimat-style has a stylish natural stone base and a half-timbered attic. In 1937, the building was sold and re-purposed as a rental apartment on the basis of the design by architect Johannes Fuks.
In the years 1944–1983, the painter Juhan Muks (1899–1983) lived in the house, which is why the house is often referred to as Muksi House in Viljandi.
The building can be viewed from the outside.