October 26th 1960, the council of De Bilt approved of the outline of the spatial planning document for 'De Uithof' i.e. that part of the area that belonged to De Bilt, in order to facilitate a proper start of the development of 'De Uithof' as a university campus. The States of Utrecht ratified the plan Juli 24th, 1961. This document regained relevance after 1989, when the Utrecht plan of 1983 was turned over by the 'Crown' regarding some residential areas.