The Archbishop of Dublin Diarmuid Martin says the Church of the Annunciation is a landmark in the history of Finglas.
There are plans to build a new smaller and purpose built Church and a pastoral centre.
He says he would rather have been setting out to open a new Church than to find himself closing a building, that has meant so much to this community over the years.
Archbishop Martin says maintenance has become problematic and its structure is showing signs of its age.
Dublin City Council's aiming to use the land for social services and housing for the elderly.