William Joseph Kelly was one of the principal lessors in the parish of Kilkeevin, barony of Castlereagh, at the time of Griffith's Valuation. In 1865, 1869 and 1870 over 2000 acres of the estate of William Joseph Kelly in the barony of Castlereagh were offered for sale in the Landed Estates' Court.The sale in June 1865 was adjourned due to insufficient bidding. Michael Kelly of Castlerea owned over 400 acres in county Roscommon and 306 acres in county Galway in the 1870s.
National Archives of Ireland:
Landed Estates' Court Rentals (O'Brien), Kelly, 16 November 1869, Vol 95, MRGS 39/047, (microfilm copy in NUIG)