For "in the world" it may be between Vancouver's Sam Kee building http://en.wikipedia.org/wiki/Sam_Kee_Building http://en.wikipedia.org/wiki/Sam_Kee_Building an

For "in the world" it may be between Vancouver's Sam Kee building http://en.wikipedia.org/wiki/Sam_Kee_Building http://en.wikipedia.org/wiki/Sam_Kee_Building and Pittsburgh's Skinny Building. http://www.post-gazette.com/pg/04151/322795.stm http://www.post-gazette.com/pg/04151/322795.stm Vancouver's building is thinner at the first floor, but has overhangs on the second which increases its width. Edit: Hmm this is for "commercial" properties so there may be thinner houses.