Rebar or reinforcing bar is used to strengthen concrete but has become a popular construction stake. Conventional fence post pullers are overkill for construction stakes. I saw a Youtube video using a vice grips to twist the stake before pulling it with an eye grab hook and rebar lever. I modified the idea to use a pipe wrench for easy turning of the rebar.
Watch my easy rebar removal method video using a pipe wrench, eye grab hook and rebar lever at https://youtu.be/9r47C80mbkE