Legislation introduced from​​ 1 April 2008 removed that discount and the total exemption previously enjoyed by industrial properties was also removed at that time.
Roedd deddfwriaeth a gyflwynwyd ar 1 Ebrill 2008 yn dileu'r gostyngiad hwnnw a chafodd cyfanswm yr eithriad, a fwynhawyd yn flaenorol gan eiddo diwydiannol, ei ddileu bryd hynny hefyd.