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Hello Ted,
Dawn and I have sold a number of homes in the City in the Hills and neither of us can remember any with guest houses or casitas.
If your budget allows for it, there are homes just to the east in Tuscany that do have guest houses... We just ran a search and there are none currently available, but they do come up from time to time and we would be happy to set up a search for you in that area - we could also cover the City in the Hills, just to be safe.
If you are interested, we can be contacted through our primary site (referenced below).
Thank you,
Robert and Dawn Morris
(661) 243-7282
Sun Nov 22 2009, 10:19