These are the costs of items or services that you share with the other people in your block. Some of these will be health & safety checks such as fire extinguishers or emergency lights. Others might be items that improve your communal areas or the building’s facilities i.e. cleaning, laundry facilities or a communal TV aerial.
This could also be communal electricity which would include all the lights in the hallways and around the block. It would also include heating for shared radiators located in communal areas in the building.