Advocate General Trstenjak (AG) has advised the European Court of Justice that, in his view, a complicated arrangement for the construction and lease of four new exhibition halls in Germany constitute a public works contract which should have gone out to open EU-wide tender. Therefore, Germany was in breach of the procurement rules. The AG's opinion (in case C-536/07) was published on 4 June 2009, in an action brought by the European Commission against Germany. The case relates to a state-owned company established to organise trade halls and exhibitions, Kölnmesse GmbH (Kölnmesse), which wanted to develop four new exhibition halls in Cologne. The City of Cologne worked out an arrangement with a private developer Grundstücksgesellschaft Köln Messe 15-18 GbR (GKM), under which it took a 30-year lease of property which included purpose-built exhibition halls, related buildings and car-parks. The City of Cologne then sub-leased the exhibition halls to Kölnmesse. The AG takes the view that Kölnmesse (not the City of Cologne) was the real contracting body and that the main object of the agreement was neither a funding arrangement nor a lease, but a public works contract.