Brooklyn, New York, specifically 355 Marcy Avenue, is known as Marcy Avenue Armory and is significant to the film because it was used to build several important sets for the movie, such as the interior of Sherlock Holmes's 221B Baker Street apartment and the attic of the Punch Bowl pub, where the bare-knuckle fight takes place. I found this information on Movie Locations, which is an academic article relaying interesting facts about locations from specifc movies. This source would be an example of collective authorship, since The Worldwide Guide to Movie Locations made it and it isn't available for comments or feedback. Also the website is dedicated to connecting movies with their real-life filming locations. Its platform organizes information by movie, location, and country, which made it easier for you to search for Sherlock Holmes. Mapping this on Cove makes visible a place a "gatekeeper" platforom might otherwise bury, since this information is readily accessible and do not need a subscription for it and it doesn't try to hide information from the public.
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https://movie-locations.com/movies/s/Sherlock-Holmes-2009.php