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Grade I listed buildings and structures are of exceptional, even international importance. There are over 6,000 in the country. Only 2.5% of listed buildings are Grade I listed.
In Scotland the classification is Category A
Index: Link

The Old Schools are part of the University of Cambridge, in the centre of Cambridge. The Old Schools house the Cambridge University Offices, which form the main administration for the University.
Within the Old Schools are West Court and Cobble Court. The building is Grade I listed.
The Old Schools building is located at the end of Trinity Lane and is surrounded by other historic University and College buildings. To the north is Gonville and Caius College. To the east is the University of Cambridge Senate House where degree ceremonies are held, on King's Parade. To the south, the scene is dominated by the large King's College Chapel. To the west are Trinity Hall College and Clare College.
The Old Schools Site covers the Old Schools, the Senate House, and Great St Mary's, the University Church.
Wikipedia: Link