I have hunted side walk tear out's for years, but recently was questioned about this. Keep in mind anytime anyone says anything or they don't want me in front of their house I leave and just move on, no fuss. This has only happened to me twice. Usually people are interested and curious and glad to see what I am doing. I have always thought of hunting the trench after the removal of the slabs as "public property" since after all I can walk on a sidewalk anytime anywhere. What do you all think?