The market value of California's housing stock is growing by nearly $15 billion a month, according to Acxiom Corp.

The real estate information service reported that the value of California's seven million homes in April had risen 9.6% from a year earlier, to $1.67 trillion.

The company said the 12-month increase in value was strongest in Southern California, at 10.3%, partly because of relatively low numbers a year earlier.

The San Francisco Bay area had a 9.7% annual increase; the central part of the state, 6.3%.

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