The West Overlay District applies to lots located within the following subareas set forth below:
(a) Subarea A.
The area bounded by Powelton Avenue, Lancaster Avenue, 37th Street, Warren Street, 36th Street, Filbert Street and 38th Street.
(b) Subarea B.
The area bounded by 32nd Street, Market Street, 31st Street (extended), Chestnut Street, 30th Street, and Arch Street (extended), excluding all portions of the railyard currently owned by Amtrak.