The book was actually a piece of very clever marketing material made by a company called Chas Baker & Co Stores Ltd. Almost every other page has a reference to the nearest branch. And at the back there are pages of ads showing the kind of clothes and accessories one could buy at their emporiums.
Most of the Holloway building is still there as you can see in my comparison photos, below. The street level and first floor now look nothing like they used to a century ago, but the upper floors are still basically the same. I am a bit confused how the 1905 drawing shows only three windows with pointy bits above them on the third floor, yet today you can see that there are matching ones to the right, but not on the part of the building that used to be the shop! Artistic licence or a matching extension?