A pile raft foundation project can be essential to meet the safety requirements and settlements compatible with the structure. Knowing the behavior and interactions in the soil-pile raft system is fundamental. This article presents the optimization of the foundation project of a residential built-in concrete wall structure from the analysis of static load tests using the Finite Element Method (FEM). Soil shear parameters and deformation were obtained using Standard Penetration Test (SPT) data. A Static Load Test (SLT) was simulated, and the results of this simulation were compared with the field static load test results to show the experimental model's stiffness by comparing the load versus settlement curves. The geotechnical parameters that best represented the field behavior were used to simulate the structure's performance seated on a piled raft. Several configurations for the pile raft project were analyzed, allowing rationalize the best raft and pile geometry considering factors such as maximum and differential settlements. The results showed that increasing the length of the piles, although more efficient than varying the raft thickness, suggests a higher likelihood of experiencing differential settlements than raising the pile cross-section.