Where was Witness 11 filmed?
2012 film
Witness 11 (2012) was filmed in Berkeley and Berkeley City Club, 2 places named in its Wikipedia article, in the United States. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Wikipedia's article
The Wikipedia article names 2 places. Each links to the sentence that says so.
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Towns & cities
Berkeley
United States
City in Alameda County, California, United States
“The film was shot in 2012 at the Berkeley City Club in Berkeley, California.” Wikipedia
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Landmarks & buildings
Berkeley City Club
United States
Historic building in Berkeley, California