Case T-220/13: Judgment of the General Court of 15 September 2016 — Scuola Elementare Maria Montessori v Commission (State aid — Municipal real estate tax — Exemption granted to non-commercial entities carrying out specific activities — Consolidated text on income tax — Exemption of the one-off municipal tax — Decision partly finding the absence of State aid and party declaring the aid incompatible with the common market — Action for annulment — Regulatory act not entailing implementing measures — Direct concern — Admissibility — Absolute impossibility of recovery — Article 14(1) of Regulation (EC) No 659/1999 — Obligation to state reasons)