The Diocese of Penang's headquarters is known as 'Pusat Keusukupan Katolik' (Catholic Diocesan Centre), or in short PKK. It is a huge 4-storey grey building located at 290 Macalister Road (right side of road).
PKK is sandwhiched between Wisma Katolik (on its left) and the Purple House (on its right). Diagonally opposite is the YMCA (on your left), and a few metres after it, is the Island Hospital (on your right).
The road where PKK is located is a one-way street. You will enter it via Perak Road. As you enter, keep right... and keep slow as PKK is nearby. First, you'll see the Penang First Assembly of God church and next to it is the Wisma Katolik. PKK is next to Wisma Katolik.
Google map location show Wisma Katolik. PKK is just next to it. Click here for clear satellite map.