I don't know for certain what this building is, but to me it looks like a homestead built many, many years ago. We discovered it almost by chance while driving down Hout Bay Main Road, from the circle next to Constantia Nek Restaurant towards Hout Bay.
The particular road on which it's located is kinda narrow and there's so much to see that, even though it's right on the roadside, it's easy to miss. I didn't want to scratch around too much, and there didn't seem to be any clues as to what the building was, or had been. Please be so kind as to leave a comment if you know something more about the building, other than that it's found in Longkloof, Hout Bay.