Case C-451/08: Judgment of the Court (Third Chamber) of 25 March 2010 (reference for a preliminary ruling from the Oberlandesgericht Düsseldorf — Germany) — Helmut Müller GmbH v Bundesanstalt für Immobilienaufgaben (Procedures for the award of public works contracts — Public works contracts — Concept — Sale by a public body of land on which the purchaser intends subsequently to carry out works — Works corresponding to a municipal authority’s urban-planning objectives)