Mayo Library (aka Surgeons' Club)

Before the 1914 medical block was constructed and the Mayo practice was based out of the Masonic Temple, their medical library was situated in a separate building. The Surgeons' Club, a sort of medical think tank for doctors visiting from around the world, met here. For that reason, you will sometimes find postcards of this building labeled "Surgeons' Club".

This is clearly the same building as above, altered and possibly integrated with what I believe to be the 1914 building in the background.