Trearne House had been built about 1870, almost on the 'footprint' of an older mansion house. Mr and Mrs Ralston-Patrick lived for some time in Burnhouse Manor until their new house was ready for them. By 1877 Mr and Mrs Ralston-Patrick were living in the new Trearne. Jenny Kerr was probably the last person born at Trearne Lodge; her mother was living there with her parents when her father was a Lieutenant in the Glasgow Highlanders, and was fighting in France during the first World War. Over Hessilhead was on the Trearne Estate along with Hessilhead, Townend of Hessilhead and an estate saw mill with its water wheel driven by the Dusk Water. During WW2 Trearne House was used by the army, following which it became Gresham House Boarding School. The school had a cook, a matron and five or six teachers up. There would be about thirty boys in the private boarding school, many of whom had parents who worked abroad.