This case study examines a 20-year-old G+2 RCC building near the coast, where severe water seepage, rebar corrosion, concrete spalling, and structural cracks were observed. Non-destructive testing (NDT) revealed poor concrete quality, high carbonation and chloride levels, and reduced load-bearing capacity. The building’s rapid deterioration was attributed to weak construction, harsh coastal conditions, and lack of maintenance. While extensive retrofitting was possible, it was economically impractical, so demolition and rebuilding were recommended. Key lessons: design for durability, conduct regular inspections, leverage NDT, and adapt structures to local environmental conditions to ensure long-term resilience.