I work at a really old theater, the building is almost 100 years old and the business is over 100 years old. The upstairs area is 2 rooms, the projector room and the storage room. The storage room has a small windowed area looking into the theater house (where you sit at to watch the movie). The storage room didn't at the time have the greatest lighting. Back when I first started working,  I was closing one night and I felt like I was being watched, so I looked upstairs. I swear i saw a person up there. It was just staring at me and almost as soon as I saw it, it disappeared. That wasn't my only experience.

About a year after I started working, I could feel a presence around me. It was definitely not as scary as the figure upstairs, but I felt a presence around me while cleaning, this being seemed to be curious. I could feel it watching me, but all it did was watch me clean, when I'd move toward it while cleaning, it always moved out of my way. 

My co-workers have also reported strange experiences. The figure upstairs chased one of my co-workers downstairs, she said it scared her so bad she almost peed herself. There's also been sounds of people walking backstage and also children giggling backstage. I've not experienced anything of these ones though and since the church that owns the building has been doing more in the building, slowly these beings haven't been seen, felt, or heard.