Californians eating oranges off their own tree? They tell me it would be well over a million dollars just for the space on which to PLANT such a tree...and then there would be the geodesic dome to keep the pollution and smog off of it, and the cost of distilled organic water to keep it alive...
I think it would be cheaper to BUY the oranges!
Citrus trees in the ground or in a pot can be an effective landscape ornament. Have you considered that aspect?