Double quiz - where and who?

The building at the top is long gone, at least if the caption is correct ... plus it was in an unusual location. Where was it?
   And part II: These two were among the most celebrated Montrealers of the 20th century, seen in a photo take in 1907. Who were they?

Hint: the top image is of a building which you needed a boat to get to and the bottom is of a couple that lived on Rachel.

Answer: The top image is of the only building on Nun's Island prior to its development. The lower photo is of the Nicols, of Rachel St. Midget Palace fame.