[lotsofpulp]

Also a safe public area to run in. Clean air, sidewalks, and a safe environment for women/people of certain skin tones are unfortunately unavailable to a very large portion of the world. Even in much of the US.

The neighborhoods with sidewalks cost a lot more, in my experience.

[robotresearcher]

And then you go further upscale and the sidewalks disappear again.

For example Silicon Valley suburb Saratoga has hardly any sidewalks. Median house price is around $4M.

Safe place to run though.

[lotsofpulp]

Those are old areas developed before codes requiring sidewalks that happen to be in a good location where rich people decided to congregate back in the day.