# 6.30:
The establishing shot of the police station is stock footage of a former police station at 209 SW Oak Street in Portland, OR, which was used on many TV series:
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The scenes at the beach (Gary, Karen, Mack, Ben and later Abby and Val) are from Will Rogers State Beach on Pacific Coast Highway. They were all filmed on / near the parking lot, approximately near lifeguard tower 10:
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You can read the street signs in this scene before Mack and Ben go to the Fishers' home: It's the corner of South Fowler Street and Holloway Avenue in Thousand Oaks, CA 91320:
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The Fishers' home was quite a tough location to find, but once I realized where the aforementioned corner was, I discovered it pretty fast. The following screen grab is from # 6.22 — you can see the street number of the house next to the door in that scene. The house is located at 3624 Erinlea Avenue, Thousand Oaks, CA 91320. It hasn't changed much; in particular there's still that 1950's wrought iron pillar supporting the roof / canopy there.
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I'm convinced the scenes from # 6.20 of Karen and Laura walking along a suburban street (Karen mails a letter) and of Val and Karen on the bikes — see my above post no. 171 — is from somewhere near the Fishers' place in Thousand Oaks. Too bad the street signs are illegible. But maybe someone wants to help and Google that neighborhood to identify that corner?