In granting building approval for your block the local council would have considered the number of car spaces required for the number of units built. If the car spaces are being subsequently reduced by enclosing some of them as storage cages, then cars from the units concerned will be parked elsewhere, adding to the problems of visitor parking and the availability of parking in the street nearby. Additionally I would be concerned about the materials stored there as commonly they attract vermin and pests, and can be a fire hazard.
So it would also be worthwhile to approach your local council to get their views on the matter, and see whether they will take action to prevent the enclosures taking place.