Could it have been a room used for greenery or some sort? Seems the logical conclusion with so many windows and the counter top. I'm thinking like a roof-top garden room, in a way.

I have spent countless hours on your site Motts, since stumbling on it while looking for Byberry pictures. All I can say is - wow. Such fantastic photography and each of your images truly conveys to the viewer. i can't wait to see the rest of your site! Thanks for taking such awesome pictures!

Wow, this reminds me of the scene straight out of Silent Hill, minus the railings. Beautiful!