Around 1987 it was decided that Hanover Quay was too toxic to sell. Regeneration began in 1998, when Bord Gáis sold the Dublin Docklands Development Authority (DDDA) the former gasworks site located in the area between Sir John Rogerson's Quay and Hanover Quay, for €19 million. The DDDA spent €52 million decontaminating the land, even though the likely return was estimated at just €40 million. The decontamination took place under the supervision of the Environmental Protection Agency, between 2002 and 2006. The process involved constructing an underground wall eight metres deep around the affected area, and the contaminated soil being dug out and removed. By the time the decontamination was finished, an inflated property bubble and increased demand in the area (brought on, in part, by the decision by Google to set up its European headquarters nearby), allowed the authority to sell the land for €300 million. The DDDA injected some of its new funds into the area's infrastructure including seats, street lighting, and civic spaces.