Case C-537/19: Judgment of the Court (Fifth Chamber) of 22 April 2021 — European Commission v Republic of Austria (Failure of a Member State to fulfil obligations — Directive 2004/18/EC — Public works contracts — Contract between a public body and a private undertaking for the lease of building not yet constructed — Article 1 — Realisation of a work corresponding to requirements specified by the tenant — Article 16 — Precluded)