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

404847N 735727W / 40.813N 73.9575W / 40.813; -73.9575 La Salle Street is a street in West Harlem that runs just two blocks between Amsterdam Avenue and Claremont Avenue. West of Convent Avenue, 125th Street was re-routed onto the old Manhattan Avenue. The original 125th Street west of Convent Avenue was swallowed up to make the super-blocks where the low income housing projects now exist. La Salle Street is the only vestige of the original routing.

Which street is the only area left of the routing onto old Manhattan Avenue?
La Salle Street