Mount Wilga House is a heritage-listed former residence and rehabilitation hospital at 2a Manor Road (Rosamond Street), Hornsby in the Hornsby Shire local government area of New South Wales, Australia. Its design is attributed to Henry Marcus Clark and was built from 1913 to 1914. It is also known as Mt Wilga. The property is privately owned. It was added to the New South Wales State Heritage Register on 2 April 1999. History The North Shore railway line terminates at Hornsby, where it connects with the Main North line going to Brooklyn, Gosford, Newcastle and eventually the North Coast and Brisbane. The Northern Line was extended from Strathfield to the Hawkesbury in 1886, passing through the present suburb of Hornsby. The station was over from the village of Hornsby (modern day Normanhurst), so in 1895 the station was called Hornsby Junction to avoid confusion. In 1900 the word Junction was dropped and the area around the station became known as Hornsby; Old Hornsby was the name adopted for the present Normanhurst. Mt Wilga Estate dates from an initial purchase in 1907 of at Hornsby by Georgina Clark, wife of the successful Sydney Draper and Retailer, Henry Marcus Clark. Additional purchases of acres and were made between 1907 and 1908. In 1908 Clark built a long suspension bridge over the deep gully which lies between Mt Wilga and Hornsby railway station to facilitate the arrival of guests to the property from Sydney. Prior to Mt. Wilga, Clark had resided in "Sefton Hall" in Marrickville Road, Dulwich Hill, which was named after a property in England. Mt. Wilga was reputedly designed by the owner and planned along similar lines to his summer home "Sefton Hall" at Mount Wilson in the northern Blue Mountains. It was intended to be Marcus Clark's winter home. The original garden as planned by Clark reflected an aesthetic of defining the property boundary and main access route as well as concealing the house from direct view and then revealing the house at journey's end. A formal area of the garden was laid out to the north of the house and open paddocks and orchard to the west of the house. To the south and south east was a service area. However, Clark died in 1913 during the construction of the large single storey Federation Queen Anne style house. It was completed in 1914 by his widow, Georgina Clark.