Any idea what the historical price of sidewalks was? My search engine foo isn't turning up much before 2007.

I've been wondering how the nice sidewalk / walking / biking places I've enjoyed were built.. was it super cheap in the 80s and skyrocketed since?

I've gone down the rabbit hole of semi-current pricing for sidewalks being built and road expansion in this mid-size city - and it's just dumb that a sidewalk install can easily cost a million dollars for a block or two for example.

I can't imagine building neighborhoods today that mimic what I miss from the past in another state - but there's no way it cost that much to build back then either I'm fairly certain.