As requested, I examined the east side of The Allen, with an eye to building a 4M wide multi-use path. I generally assumed that I did not have to provide for landscaping, but that I would not remove an existing row of mature trees.
I find that to have a continuous (zero gap), 4M wide trail, without removing a significant number of mature trees would require the partial or full taking of 16 properties. There are 2-4 where it might be feasible to just move a fence over by ~2 meters and/or to remove (and possibly relocate a free standing garage or out-building. The remaining properties would be would whole takes.
I think you would be looking at 22-28M in acquisition costs, and another 3M in demo, before trail construction.
A few notable pinch points:
View attachment 651675
No trail here, road is very narrow as is, no existing sidewalk, one of the 2 houses must go.
Below, I show a pinch point that is 3.2M wide. The adjacent home would have to go.
View attachment 651676
Just north of that the available space from the curb to the fence above the Allen embankment is under 3.0M.
The road cannot be narrowed sufficiently, one home would have to go to allow re-alignment of the road and sufficient minimum width.
View attachment 651677
Next, no trail here, or room, 2 lots required:
View attachment 651678
I'll leave it at that for now. Needless to say, a very expensive options.