In February 2009 the Auken report, by a Danish member of the European Parliament, became news in Spain. The reasons are the complains of citizens of other EU member states that had bought homes in Spain to find out they were affected by the urban planning laws of the Valencia region, with fast management procedures that they understood as opposed to their property rights.
The report analyses the fast urban growth of the country, its effects on the environment and other issues. Urban planning is central, but not as such (it is a matter of the States), rather as something that impacts the rights of the citizens.
An interesting reading on the limits that the Union sets to the power of the States. Since this report, there have been legal changes in Valencia, and there are already blueprints of a new law that would group what now is a too extensive legal corpus.
The report was seen as a good thing by many in Spain: those same problems also concerned Spanish citizens. Here the Union gave a broader view to adopt a decision on the effects of a temporary and state-specific issue (the real estate bubble). Only a minority (or at least this is what I have perceived) saw that as an encroachment on the sovereignty of the State.