Read this and answer the question. If the question is unanswerable, say "unanswerable".

West of Fort Washington Avenue, 181st Street is largely residential, bordering Hudson Heights and having a few shops to serve the local residents. East of Fort Washington Avenue, the street becomes increasingly commercial, becoming dominated entirely by retail stores where the street reaches Broadway and continues as such until reaching the Harlem River. It is the area's major shopping district.

In which direction is 181st Street mostly commercial?
East