C'mon....
The way he should have dealt with that mistake was simple ~ Use it against them.
Sure, we don't do dungeons anymore but the Court works in government owned buildings that get heating from the Executive. No reason they need heat.
Then there's parking. They don't need to park. Their predecessors didn't park cars back in the 18th century when the constitution was written, so why should they. The Executive could have taken the parking and leased it out to street vendors or something.
But, whether or not dungeons are in fashion these days, I think people who demand Executive supremacy should get their faces rubbed in it almost immediately. They are like puppies peeing on the couch!