In the 1870s William Middleton, of Wine Street, Sligo, owned over 1600 acres in the county. In 1906 his representatives held over 350 acres of untenanted land in the Rosses Point area of the barony of Carbury.
Contemporary printed sources
- PARLIAMENTARY PAPERS. ''Return of owners of land of one acre and upwards, in the several counties .... in Ireland''. HC 1876, LXXX: 322.
- PARLIAMENTARY PAPERS. ''Return of Untenanted Lands in Rural Districts, Distinguishing Demesnes on Which There is a Mansion...'', HC 1906, c, 177: 394.
Modern printed sources
- McTERNAN, John C. ''Sligo: the light of bygone days, Vol.I Houses of Sligo and associated families''. Sligo: Avena Publications, 2009. : 78-79 (Elsinore), 255-256 (Avena)
- BLAKE, Tarquin. ''Abandoned mansions of Ireland II: more portraits of forgotten stately homes'' Cork: Collins Press, 2012. : 240-247 (Elsinore)