Just my opinion, but having stayed there and walked around, I would say the 50s seemed closer. The 80s and 90s were the two in my opinion that seemed the furthest walk. I stayed in the 60s which is the preferred, but I booked another room for later this month, and just got standard so I can try another decade. 80s and 90s are not terribly far from the main building, but have to walk past maybe two or 3 buildings to get to the main hall. 50s are more like 1 building away, just behind the 60s building. Hope this helps!