Quote Scarlet Pimpernell="Scarlet Pimpernell" so can only assume it is written into the deeds. I am therefore confused why this time you see some sort of mystery, I am sure the Building can be redeveloped subject to approval but I doubt the car park can be quite so easily.
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As far as I am aware there is no right of way over the car park but most likey one could be applied for by way of a statutory declaration of 2o yrs use.
Secondly that's rubbish about planning on a car park. Hundreds are built over especially when not in green belt. Planning for houses in this time of high demand would be a breeze. After all planning for houses has already been obtained on the adjacent sports stadium.