Solar panel farms actually work really well with rewilding projects. Not forests sure but if instead of where we grow fuel corn we instead dropped solar and rewild them for more power than the corn can provide plus biodiversity.

And as others said there's plenty of empty spaces already existing that most of what you list can use. There's two malls near me with half the shops or more empty, an abandoned hotel (though it was recently announced it would be converted into apartments so, ya know, proving my point) and a field bought by a hospital just being left as bare dirt (because they say they might need it some day).