In response to the increasing number of building collapses in Abidjan, this study aims to determine the most suitable foundation type for a construction project located in Port-Bouët, southern Abidjan. Geotechnical investigations, including core drilling and Ménard pressuremeter tests, were conducted to characterize soil conditions up to a depth of 25 meters. Data analysis was performed using XPRS, XGTE, and FOXTA software. The results revealed three main soil layers with increasing compactness with depth. Three foundation types—isolated footings, raft foundations, and piles—were evaluated. While isolated footings produced acceptable settlements, their large number could lead to unfavorable interactions. Raft foundations, though more economical, were found unsuitable due to excessive differential settlements. Pile foundations, although more expensive, provided optimal bearing capacity and limited settlements. The study concludes that deep pile foundations are the most technically reliable and durable option for the site. It also recommends the systematic use of geotechnical studies to prevent building failures in Côte d’Ivoire.