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This map has the walk drawn in. I left the hotel, heading for the Charles River which separates Boston from Cambridge (in the sense that Sydney Harbour separates Sydney from North Sydney).
Commonwealth Avenue runs roughly parallel to the Charles River, running from the west into downtown. It is a beautiful street, with a very generous garden strip down the middle.
Ah, the Prudential building! As I said, it is quite a landmark. Note also the terrace (or row) houses. Depending upon the neighbourhood, these seemed to be either single family, or multiple family (I presume one per floor).
Looking across the river to the Massacgusetts Institute of Technology, more commonly known as MIT.