Zutari proposed an innovative design incorporating the existing structure. Two new basement levels were added below, while four floors were built above. A novel underpinning method was implemented, using steel micropiles arranged in four-pile groups per column and connected to existing columns with steel transfer pods. Existing columns were strengthened with steel to allow continuous construction above.

Excavation for the new basements was carefully executed around the new piles, which were braced during the process. New pad foundations and columns were installed under the existing columns before removing the bracing and completing the topmost floor. This approach allowed simultaneous construction above and below the existing building, ensuring completion on time and within budget.