This #BlackFridayParking (or next, or whenever) consider remediatation along with documentation. If truly unused, next year you could be delighted by a cover of morning glory or whatever you sow: preferably native, don't forget acorns or fruit tree seeds in abandoned planting strips/wells often found in ununsed parking lots.
I don't have illustrative photos handy, so first two are of volunteers growing in barely used lots, third is of unused wells that may have acorns in them.