Is the margin between sidewalk and street private property?

There’s a cool/sculptural bench made out of a tractor seat in my neighborhood. Thinking of recommending it as a waystop, but wanted to clarify first if it would be in a location that meets criteria.
It is permanently installed and on the planting ****/margin between the sidewalk and the street in a single family residential neighborhood in Seattle, USA.
Is the “margin” btwn the sidewalk and street considered PRP? Please advise, thank you.
Comments
By most reviewers and probably Niantic (for purposes of nomination review or ineligibility report), yes, this is likely to be considered PRP.
That said, Giffard gave a clarification some time ago that a POI that is away from, and does not interfere with, PRP can be eligible. This is been interpreted by some to mean the interval between the sidewalk and the street, but that was not clarified in such solid terms by an official source. So, you can nominate, but it’s probably at best a coin flip on the PRP issue.
Private residential property ends at the property line. If there is a wall or fence indicating the property line, the wall or fence and everything attached to it is considered private residential property. If there is no clear boundery, common sense should be used. Is the object likely installed by the home owner, it is private residential property. If it is installed by the government it is likely not on private residential property. Sidewalks are rarely on private residential property, so anything between the sidewalk and the street is unlikely to be on private residential property.
Here’s a screenshot from google streetview of the seat/bench.
(Also, wow, funny that the commonly used term for the planting area in a sidewalk margin got auto-censored above!)
Hard to see in that picture, but there appears to be a fence between the property and the sidewalk. So I would not consider that location to be private residential property.
That said, I don't really see how this meets eligibility criteria. You're gonna have a hard time convincing people it is eligible.
…that is not a “sculptural bench.”
Thanks everyone for your insight. Maybe it isn’t sculptural enough! I think it kinda looks cooler now as it is situated with interesting plantings and other art objects around it, although I wouldn’t call the other art pieces “permanent.”
I probably won’t submit it if the feedback is that it isn’t worthy.
I appreciate the info on the sidewalk-interval regardless. Thanks again.