I hope this helps, if you have any further questions please feel free to contact me.
All the best,
President & Licensed Real Estate Broker
Manhattan Boutique Real Estate
Here's my other thought. As shareholders in a Co-opertive living environment, it is also upon the shareholders to keep this area clean as well. That is to say nobody has a right to cast litter around, carve their initials in the trees or in general make the space less inviting for all that live there. After all you ALL pay for the use of this space.