The Linden Observatory is of State heritage significance for its historic values. Ken Beames' 24 telescope housed in the custom built observatory was important in the history of telescope making in Australia and NSW as it was the largest Australian made telescope in NSW from the time of its construction in the late 1930s until the 1960s when the 40 inch and 24 inch telescopes at Siding Spring Observatory were designed and constructed. Beames' 24 inch telescope is regarded as one of the most significant amateur built instruments in Australia at the time it was built, and remains so to this day. While amateur instruments of this aperture are becoming more common, instruments of this size with professional standard mounting and drives are not. . The observatory where Beames made his telescopes and other instruments and optics associated with the strudy of astronomy is tangible evidence of the ongoing, strong and productive relationship between the amateur and professional in the field of astronomy from the late 19th century through the 20th century.