I am of the camp that never finds mansard roofs to be an attractive design theme. Having said that, there is nothing wrong with Mark's Clayton Park modern example. It is not a mansard design and to me just looks like a modern design theme, which may or may not be one's cup of tea. I think it looks better than the more traditional neighbor property.
I'm not sure what you could design that would fit with this ugly streetscape on Creighton:
https://goo.gl/maps/v6RRLqi2Cms
The proposal is a massive improvement.