electric meter count

Hello,
Consider a building with 3 dwelling units, and some common space (laundry room and stairwell.) There are currently 3 meters, the laundry/stairwell/outdoor power connected to house meter. Each smaller unit has its own meter. Is there anything unsafe about this situation? Does adding a 4th meter just clarify electric bills, or is it possible something is tapped or connected in a dangerous manner?

Thank you