Beaumont was originally a farm in the Civil Parish of Coolock, between the townlands of Kilmore Big and Kilmore Little. It is the former home of the Guinness family from 1764-1855. The original 1764 lease between Charles Gardiner and Arthur Guinness can still be seen in the National Library of Ireland. Guinness took "more or less situate in the Parish of Coolock" on a lease for the longer of 31 years or three lives, and built a house "at Kilmore" ; it is apparent that he later named the property "Beaumont". His rent was £93 p.a.