sentences:  According to the manager for the State Government's Centenary Stonework Program, Ron Powell, "There is nothing stopping developers at all from just trashing it".In 2008, a Sydney city councillor said that planning laws stand, City of Sydney Council can allow the yellowblock to be "harvested" but cannot mandate that developers excavate the stone in a way that preserves it.Conservation and a revival in use has caused some clashes between principles and practice.