I was in Beacon Hill recently, so I was amused that you happened to choose a few examples from there. Indeed - in a lot of cities with intact, circa 1700-era neighbourhoods (Boston, Philadelphia are the two I'm familiar with) you'll get narrow streets, narrow sidewalks and 2-3 storey high streetwalls. Trees are a rarity because they just can't grow without encroaching onto the roads or into the foundations of houses themselves.
That said, I think you could look at neighbourhoods in Brooklyn
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I
think I measured the road as ~7m. The sidewalks are wide enough for trees and strollers. I don't know about accessibility devices. Basically all of Brooklyn Heights, Boerum Hill, Cobble Hill etc. look like this. 3 storey streetwalls are the norm, and I believe (don't quote me on this) - but 4 storeys are allowed on redevelopments in anything that isn't heritage.
Great pic, though lets let others see it w/o the click:
First, on the ROW, building face to building face, its 18M (16M from fence to fence).
Second, Curb to Curb, roadway is 9M.
Third, I take no issue w/streetwalls this height, 3.5s; everything in Villiers is already this tall (proposed), others are arguing for much taller streetwalls than these. I'm find w/streetwalls up to 3s on mews and 4s facing streets.
These are two examples in the West Village:
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(first one is higher streetwalls)
So Perry Street, overhead view first:
Ok.....can we talk about the absence of towers here and how this is much lower density than Villiers?
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ROW (building face to face) is ~14M
Curb to Curb is 7.5M for the most part.
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Now for Streetview:
Hmm, that looks like it's working super well........ lots of cars, truck parked on the sidewalk blocking that accessible width..... insufficient space for a fire truck......
Up in Hells Kitchen:
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I don't think these are particularly unique examples in New York. Large chunks of Manhattan and Brooklyn have the same typology - with 3s being on the lower end. Yes, both boroughs have plenty of very wide streets, but they have a lot of comparatively tight streets with 3s+ buildings on each side.
Let's bring this one forward too:
Aerial first:
ROW: ~17M
Roadway: ~7M
Observations: Zero Towers; less dense than Villiers, lots of on-street parking, no cycling facilities, sidewalks do not meet accessibility standards due to trees and encroachments.
I looked up the population density of Hell's Kitchen as a whole. It's 103,000 per mile2 which is 39,000 per km2.
Villiers is proposed to be 59,000 per km2, or 50% denser than Hell's kitchen.
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I think people keep confusing feelings and anecdotes with math....
We can build Villiers similar to this, but we will have to cut the density by 1/3 and eliminate bike lanes, and build a subway.