In Arrested Development, which is set in Orange County, CA, the model home is shown visibly in a undeveloped area. This area specifically a residential development called Sudden Valley. Where in O.C. is the model home located? From the locations listed on the show the family appears to be somewhere in Irvine or Newport Beach but the location of the model home doesn't seem to be stated on screen.
From the Arrested Development Wiki:
A map of Sudden Valley shows its location northeast of Mission Viejo and Las Flores, putting approximately in the location of Rancho Santa Margarita, Orange County, California.