Hi, I watched an anime movie years ago and it stuck with me for a long time, there was something about the vibe of the movie that just calmed me down and turned on my philosophical thoughts. The movie wasn't particularly special or amazing but it had a good production as far as I remember and it sticks with you same way 12 episode, single season animes do lol.
It was about a group of young guys and girls, maybe highshcool age and one child hanging around an old warehouse/ factory type building and possibly trying to prevent it's demolition. The kid wasn't part of the main group as far as I remember and might've been living there originally.
Unfortunately my memory of it is very fuzzy so take my description with a pinch of salt and if there's any title that pops to your head, I'd appreciate if you mention it.