This was once one of the many pen factories that existed in Birmingham.
At one point 75% of all written word was with a pen made in one of the Birmingham factories. This one being John Heath's which became known as Kingfield Heath at some point in the 80's who were manufacturers of stationary equipment. The remaining paperwork we found ends at 2001 so this would be when the factory closed I presume. Time hasn't been good to this place as all of the glass ceiling in the main factory floor has all come down and smashed. And there was not a pen or any stationary in sight.