OP, you are in luck, I know where you mean. I was there only last week, or it might've been last year. There was a room, with walls, and a door ( I think). A woman,(or a man), was in there, (could've been a coffee machine though), and yeah, something was going on. And yes, it was by a park, or was it ? It was definitely somewhere. Hope this helps.
(Stunning contribution though , during your 6+ years on here).