The monetary value of unused land owned by England's regional development agencies at 31 March was £268,021,001, according to business minister Pat McFadden.
In a Commons written answer he told Julia Goldsworthy the figure is based on the monetary value of land holdings recorded on each agency's asset register on which there was no activity or development.
"In virtually all cases the RDAs are negotiating the development or plans for development of these assets," he said.
"While assets are revalued at least annually by RDAs, the book value may not reflect the actual value of a particular holding therefore these figures should only be considered an estimate."

