Conversation so far:
where did Tony O'Reilly live?
A number of homes are associated with O'Reilly, including his current official main residence, Lissadell, with a beach within private gated community Lyford Cay near Nassau in the Bahamas.
Are there any other interesting aspects about the Tony O'Reilly article besides Lissadell?
For many years his principal residence and later a major base, was Castlemartin, a big house dating in current form from the 18th century, at Kilcullen, County Kildare.

Question: did he own anything else?
Self-contained rewrite: Did Tony O'Reilly own anything else besides Lissadell and Castlemartin?