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The establishment of BART, the modernization of Highway 24, and the addition of a fourth Caldecott Tunnel bore all served to reinforce the demographic and economic trends in the Diablo area, with cities such as Walnut Creek becoming edge cities.
The central county cities have in turn spawned their own suburbs within the county, extending east along the county’s estuarine north shore; with the older development areas ofBay Point and Pittsburg being augmented by extensive development in Antioch, Oakley, and Brentwood.
The effects of the housing value crash (2008–2011) have varied widely throughout the county. Values of houses in prosperous areas with good schools have declined only modestly in value, while houses recently built outlying suburbs in the eastern county have experienced severe reductions in value, accelerated by high unemployment and consequent mortgage foreclosures, owner strategic walk-aways, and the too-rapid conversion of neighborhoods from owner-occupancy to rentals.