Unusual house addition in Boulder, Colorado

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I was in my hometown of Boulder, Colorado last week. While taking a walk in the neighborhood with my family, we saw this unusual house. The stone cottage used to be in the center of the lot. The owners moved it to the front of the property and built a connected addition that nearly fills the lot.

Change-O-House UPDATE: I just remembered that I took a photo of a somewhat similar house about one block away. Click to make big.