I'm not sure that the words logic and Historic Scotland belong together. I would say their objections are akin to the regulations on listed buildings in that they have a very strong influence on planning decisions. The problem here is that the decision was made in 1999 and restrictions remain. Any lifting of restrictions would involve renewed planning processes. With so much additional housing having already been built and with more to follow on the Bond site, thus putting even more pressure on available parking space and more traffic using the road, it's hard to see that a more relaxed view would be taken.