Marble & Lemon building at Emmet Place - rarely mentioned, small but beautiful.
There are are number of buildings along South Mall that stand-out. City Hall has its moments. Plus those old department store buildings like Burtons, what is now Brown Thomas, Roches Stores and the former Grant Building all along Patrick's Street (most designed by Foster & Grant) are all noteworthy. But St. Finbarr's is by far the biggest eye-catcher.
New entries I think are noteworthy are the UCC Student Centre extension, No.5 Lapps Quay, RCI Building in Mahon, Estuary Court at Rochestown and Mercy University Hospital on Grenville Place. Lewis Glucksman Gallery, UCC - Coppinger Court and Tony Macken's small but stand-out apartment building on Henry Street.