SAN FRANCISCO (KCBS) – There’s a new twist to the Bay Area’s crazy rental market. It seems rents are falling in San Francisco and Silicon Valley, but going up in towns like Petaluma and Concord.

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The rental website Zumper said the year-to-year rental price in San Francisco dropped nine percent over the last year, by 13 percent in Santa Clara and by 15 percent in Redwood City.

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At the same time, year to year rents increased by 15 percent in Concord and Petaluma. Rents are also up ten percent in Vallejo.

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Still, rental costs in these towns are among the lowest in the Bay Area, while rents in San Francisco, Redwood City and other cities in Silicon Valley are among the highest.