I feel like people are letting their preexisting hatred for this building cloud their creative mind. This is the Johnson Public Library building before and after reno. This is exactly what we are talking about here.
I don't actually hate the building. I like it. I like the Lindemann too. I'd be for any proposal that can largely preserve the building, break up the megablock, and create a more active, human-scaled area. That said, the Johnson isn't exactly what we're talking about. Yes, it's a very successful renovation, but the scale and function of the Hurley is very different than the Library. It's hard to imagine being able to duplicate that type of activated streetwall at the Hurley given the use (9-5 offices vs. public library), and the fact that the facade takes up hundreds of feet of sidewalk space on 3 separate streets. If we're just talking the small Cambridge St. section, I would be inclined to agree with you. But the amount of space as well as the slope of the hill on New Chardon and Staniford St. make anything like the Johnson building extremely difficult/impossible to replicate. When you factor in the uses of either building, I don't see much parallel beyond the similar architectural style.
This is all about height. The difference between walking alongside a 3 foot wall vs a 6 foot wall vs a 40 foot wall need no further explanation. If the sidewalk itself was activated by adding trees — and, especially by widening it even more to make this stretch of sidewalk it's own "thing" and give a sense of place — the 5-6 foot high wall there could actually help enclose this space in a nice way, rather than exacerbate the situation.
I'm not really arguing about the height of the wall. My point is that the entire stretch of New Chardon is bad from a pedestrian standpoint and trying to make the case that the Brooke is somehow significantly worse than the Hurley over there doesn't hold a lot of water for me. Trees, a wider sidewalk, bike lanes, bus lanes, etc. are nice, but they don't address the larger issue which is that the whole super block is not designed for humans. Staniford has very wide sidewalks, windows at the street level, newly planted trees, and a separated bike lane. It's still a miserable pedestrian experience and even mature trees wouldn't fix it.