There are a couple of issues:
Fire Safety – Are the shoes obstructing the exit system from the building i.e. are they obstructing a path of travel from the building?
It is a compliance breach to obstruct a path of travel from a building. From memory the unobstructed width of the path of travel must be at least one meter.
An obstruction does not necessarily mean a blockage. It can mean an obstacle.
In a dark and smoke filled corridor during an emergency a person would not want to fall over the shoes, thereby creating an additional obstruction by their fall.
By-Laws: Does your building have a by-law relating to occupants and their leaving of possessions on common property?
If you are not on the committee then write to the committee and request that this issue be raised at the next committee meeting. Suggest that a group letter or notice would be a good idea.
If the properties are tenanted then the letter can be placed under the door or sent to the owner and agent with the instruction that the letter be passed on to the tenant.