Buildings, even official ones, under renovation are more and more covered by tarpaulins – and publicity. Many people find this disturbing, which is understandable. However and at least, it means that part of the renovating costs are covered by this publicity. Even if the contribution may be modest compared to the total costs, it seems however that this, which you may call sponsoring, often can represent millions of €uros.
… and when you e.g. look on the result here (for more details see posts here and here) I guess you must somehow be satisfied. Or…?