Even though people seem to moan at me when I do this I am going to use the real life card.
Parker and Glass Co or on a small trading estate of which all properties are owned by the bank. This means the bank owns the land that they sit on, not the local authority. There is only one trading estate that I know of that the council actually have rights for the land on.
Even in cases of local authority, civilians who are not visiting or established in buildings within the estate do not have a right of way on an industrial estate. If the collective building owners do not want people parking or roaming the industrial estate they have the right to request that the person be removed.