The Tribunal's jurisdiction arises from:

The Valuation Act, 2001 (No. 13 of 2001) which came into effect on 2nd May 2002
and 
The Derelict Sites Act 1990 (No. 14 of 1990) which came into effect on 27th June 1990.

Valuation Act, 2001 - pdf format

Derelict Sites Act 1990

(Adobe Acrobat Reader is required to view and print PDF files)