Which street address is indicated as 140 W?

The correct street address indicated as 140 W is LaSalle. In Chicago, street addresses are structured based on their numbering system, where the letter corresponds to a particular street, and the number represents the distance from a designated central point, typically the intersection of State and Madison Streets.

LaSalle Street runs north-south and is one of the main streets in the financial district. The "W" in the address signifies that it is located west of the central point. Therefore, an address like 140 W LaSalle would imply it is situated 140 feet west of the designated starting point along LaSalle Street.

While options like Wells, Orleans, and Franklin are also streets in Chicago, they do not correspond to the "140 W" designation, as each of these streets has its own unique address numbers and cannot be classified under the same numbering system as LaSalle.