I've spent a couple of hours on this today, it's hard to believe that a grand building like this with so many ornate features cannot be found on google. There were some similar features on the workhouse in Sunderland but in many respects the unknown building is a lot more ornate. I've checked asylums, workhouses, convalescent homes, schools, hospitals and prisons, all to no avail. As suggested there is a typical 70s multi-storey car park in the distance (probably demolished by now).
I will be super impressed if or when this is solved. John