So the EC picked and chooses what they enforce in this complex? They are telling you what you can’t do but obviously not telling the residents that they can’t park in the visitors spots which in most complexes in a by law.
Though I would be concerned about renting out a garage to just anyone who would then have a security key. It is obviously not a garage located on the outside of the building. But if you get the EC to actually monitor the visitors car spots, you may well find someone in the building who will then be in need of a garage. But why would they pay you for the privilege of extra parking when the EC let’s them use the visitors spots for free and without penalty?