Crispy, it looks like you're referring to this building in Book 5:
Pemberton Industries Office Building. This squat complex once served as a testing ground for the discredited Pemberton Industries’ experiments with personal arcanoscientific devices. Now it is locked and lightly guarded until Benedict Pemberton or his debtors can clear out the labs. The university briefly had a department of arcanoscience based here, but now the students have been forced to find other accommodations, most of them much less safe in the event of accidents.
There are also these lines in Book 6:
Today, Gradiax goes by the name Benedict Pemberton, owner of Pemberton Industries, which until recently manufactured experimental military technologies in Flint, the industrial heart of Risur. Harkover Lee and Pemberton both know each other’s identities, and Lee has kept an eye on his fellow dragon’s business, wary of betrayal.
My best guess- between Book 4 and 5, Harkover and Aodhan got suspicious of Pemberton and either started investigating him or ordered him to close down operations. Maybe they didn't like him getting involved in politics (in it, he argues that the Risur-Danor peace conference scheduled for early Spring 501 could kill the nation’s progress in technological innovation, since without the threat of war there will be no motivation for research. Critics charge he’s making a veiled push for war with Ber, about which he makes derogatory claims throughout the book.) I think he then fled for Ber with his base and his corporate holdings there.
Brainstorming for Zeitvice Book 8 is going well. I've read through my game's OOC logs and come up with 40+ issues to mention, and there'll likely be more after I finish re-reading the book.