The Mixcoac House may appear very beautiful in the images above, but if you were to walk by it on the street, you would swear it's just another slum. The reason for this is that it still uses the original street-facing facade, looking old and run down to passers by, keeping the ultra modern addition hidden.
This was likely done because of the questionable neighborhood it was built in in Mexico City. To me that really seems like a smart strategy that's never really implemented. If you build a home like the Mixcoac House in a less-than-desirable part of town, the last thing you want to do is show it off. Building a luxury home on cheap real estate is like having your cake and eating it too.