I honestly think they did a nice job with this - they kept the original roof lines but added in dormers on either side. It's in keeping with the building's style and rather pleasing visually.
One of the workers told me it's extremely nice up there in the new second floor apartment. "Too rich for me, that's for sure!" was his comment, but it was said with admiration.
So... not all change is dreadful. The Quarterdeck will remain and its home has been carefully shored up.
Now we just need summer to get here so we can wander in the front door in beachy sandals!