The site of the new church bore soft soil and swampy portions, so in addition to draining the property, Father Cambiaso tried to modified his plans to accommodate the less-than-ideal terrain for such a monumental building. Unfortunately, his efforts were inadequate, a point revealed in the 1920s. When the church was originally constructed, it was flanked with an auxiliary and much simpler building to serve as a residence and school (this is the structure to the right of the church in the 1873 illustration below). This secondary annex was sold in 1920 and demolished to make way for what would become know as the Père Marquette Building. The disruption of this construction caused significant damage to the church's foundation such that the entire structure had to be rebuilt.
Painstakingly disassembled and then reassembled beginning in 1929, Immaculate Conception Church was re-dedicated 2 March 1930. Among the numerous splendid interior features, one can highlight the magnificent altarpiece, designed by New Orleans native Jame Ferret and hand-crafted in Lyons, France, in 1867. It also originally housed the 1884 Louisiana Cotton Exposition Organ, although this has since been replaced by a more modern instrument.
The 1884 Cotton Exposition is no sidenote in history, however. Alongside French Catholicism, New Orleans enjoyed a large creole population and influence, where Native Americans, Africans, Caribbeans (mostly of African heritage), and Europeans congregated in a city that stood as an epicenter of cotton exchange. Hundreds of years of Atlantic Word activity that included the forced transportation of several million Africans coincided with the development of the sugar trade, cotton trade, and other labor-intensive farming industries in the Western Hemisphere. In addition to the humor horror stories, political stresses, and economic history, there is a rich cultural history that emerged. The The church's original organ that was used in the 1884 Cotton Exposition serves as small reminder of New Orleans history that's tied to slavery, cotton, and one large facet of the human element tied to the Columbian Exchange. 4
It's original building being constructed during the Antebellum period, Immaculate Conception connects modern society with numerous aspects of New Orleans' past.