CALIFORNIA | LOCAL
September 11, 1998 | GREGORY MENA and BONNIE HARRIS HAYES, TIMES STAFF WRITERS
For residents in the hills of affluent North Tustin, it's a question of market value--or, more precisely, the value of a market. Worried about an increase in traffic and decrease in property prices, neighbors have managed to stop the development of an upscale grocery store on the edge of their unincorporated community, where it's difficult to find a home for less than $350,000 and the median household income is $90,000 a year.