During the Bloomsbury course (see the HOTEL, Bloomsbury, London project) we all had to do a survey of a traditional work of architecture. I chose to redraw Bedford Square nr. 15 in elevation and section. The elevation gave me a lesson on proportions. There is a huge amount of design only in working with proportions. In modern architecture and also in architecture school this topic seams to be understated.
The second lessen I learned was how the section makes the ground floor more flexible. The sunken down basement creates a buffer zone and a sense of security between the public street and the building.