At the time of our oral evidence session in June, the Department had only one remaining estate optimisation target, set in the 2015 Spending Review: to reduce the built estate by 30% (23,200 hectares) by 2040–41.23 The Department said that this target was based on a top-down assumption that was not based on detailed plans, and was arbitrarily based on how much the Armed Forces had shrunk between 2000 and 2015.24