sentences:  The Dunsany Estate was reduced by the operation of the Land Acts in the late 19th and early 20th century but the castle remained surrounded by its original demesne, and other estate lands remain around the district, some adjacent to the demesne and some remote.Much of the work of the writer Lord Dunsany was done at the Castle, notably in a room in one of the building's towers.The author commissioned a two-storey extension to one side of the rear of the castle in 1910.