what is a brownstone house
135 pages on this wiki. The Brownstone is a house located in New York City at 42 Stanford Avenue, Brooklyn, New York, 11209. It is owned by Sherlock Holmes' father, and is home to Sherlock and Joan Watson, although Joan is only living there until she can find another suitable apartment.ehind the scenes Edit. 1  Although the brownstone is in Brooklyn on the show, the outside of the building is shot in Harlem, New York City, with interiors shot at Silvercup Studios in Queens. 2  The roof is a real rooftop in New York City and is located at the corner of 10th St & 44th Av.