This building is now the School of Law, Queen's University Belfast. Also its footprint has changed to join it with the Peter Frogatt Centre, and to construct an arch onto the Quad, running directly from the white path here to the red dotted line across the grass. See here:

http://www.law.qub.ac.uk/schools/SchoolofLaw/Discover/

And photo here depicting path between graduate school and archway to Quad:
http://www.law.qub.ac.uk/schools/media/Media,790652,en.jpg

Should be Peter Froggatt Centre.