I haven’t looked up the law but recognize that lean-tos are often shared camps when found along hiking trails and it’s good camper etiquette to not crowd the space. Reply
Nature Into Action 
It’s illegal to set a tent up in a lean-to in NY?
I haven’t looked up the law but recognize that lean-tos are often shared camps when found along hiking trails and it’s good camper etiquette to not crowd the space.