With the Old Main needing to be emptied so. [fact]
With the Old Main needing to be emptied so that it could be repurposed as a museum, the collection was unceremoniously removed to temporary warehousing, while an unspecified proportion of the books were simply dumped in landfill: some estimate 200,000 books, others half a million.
Andrew Pettegree, Arthur der Weduwen, The Library- A Fragile Hist…, loc. 914