Which building was primarily known for housing the city's financial hub in the 19th century?

The Old Bank of Louisiana is recognized as the primary building that housed the city's financial hub during the 19th century. This establishment played a significant role in the economic development of New Orleans, especially as the city grew in prominence as a major trading port in the United States. The Old Bank of Louisiana facilitated various financial transactions and banking activities, contributing to the overall vitality of the local economy during that era.

In contrast, while the Old Bank of the United States and the Old Louisiana State Bank have historical importance, they did not serve as the central financial institution for the city during the 19th century like the Old Bank of Louisiana did. The Fifth Circuit Court, being a court and not a financial institution, also does not fit the context of this question regarding the financial activities of the time.