That is a good question, it appears that the area and street you are asking about is right on the Calabasas/Agoura boarder. I found the same listing you are asking about with a calabasas address on trulia also http://www.trulia.com/homes/California/Calabasas/sold/21345864-26962-Calamine-Dr-Calabasas-CA-91301. It is probable listed both way so that people searching in both areas will be able to find it easily.
If you have any further question about properties in the area please let me know. I would love to help you in your home search.
Keller Williams Estates Calabasas