The palace mentioned was the old name for St Marys Priory in Tallaght Village, mentioned in the previous link
http://www.southdublincountyhistory.ie/tallaght_history.htm. the end of the
Old Bawn road reaches to Bohernabreena, which is still a very rural place. Most of the locals are from original farming families as they have some kind of ban on new building, so there may be decendants there
. Old bawn itself was famed for Old Bawn House.
http://www.askaboutireland.ie/show_narrative_page.do?page_id=2077.
I know there is a good book, Malachi Horan remembers, based on a memories of a great story teller from around that time.
There is a Tallaght Historical Society but I can't find any details. I know there is a lot of interesting stuff around about Tallaght at that time, but strangely enough its not to be found on the internet. I would imagine the Staff in South Dublin County Council Libraries, would be more thatn happy to help.
http://216.239.59.104/search?q=cache:fFhmPKBXXrYJ:www.southdublinlibraries.ie/services/local_studies/allroads_pdf_files/7th%2520Sixteen.pdf+malachi+horan+remembers&hl=en&ct=clnk&cd=1&gl=ie&client=firefox-a