I was in a place that got raided once, too. A long time ago, o W. 56th St. It was scary, but I was in the bathroom at the time. Naked, but in the bathroom. It was an immigration bust so they weren't interested in me. They gave me a beer from the fridge and let me go. It was quite a thing, but nothing illegal was going on with me, so they had nothing.
It may be different now, but that time was a sweep of illegal immigrants. Since the guys were let go, this may have been a similar thing. Immigration is a hotter topic these days.
It makes for a great story anyway.
Be careful. I'd go at night if at all, since my raid was in the middle of the afternoon.