In 1951 , Sheraton bought the hotel , renamed it the '' ' Sheraton-Cadillac Hotel ' '' , and undertook massive renovations . All public spaces except the ballrooms and Italian Garden were redone and escalators replaced the grand staircase . In 1975 , with business declining and the hotel in need of another renovation , Sheraton sold the building to Herbert R. Weissberg and it became the '' ' Detroit-Cadillac Hotel ' '' . Ownership changed again in 1976 , and it became the '' ' Radisson-Cadillac Hotel ' '' . In 1979 the Radisson chain sold the property , and it became the '' ' Book-Cadillac ' '' once again . Though it had been considered the city 's top hotel for many years , the owners announced that the hotel would close due to declining occupancy . The city of Detroit , scheduled to host the 1980 Republican National Convention , did not want to face the prospect of losing more downtown hotel space , so in late 1979 the city entered into a partnership through the Detroit Economic Growth Corporation with the owners to keep the hotel open
1980 Republican National Convention
1980 Republican National Convention
Westin Book Cadillac Hotel