SKIL conceived the first Special Economic Zone in the private sector, at Khopta, about 15 kilometers from Jawaharlal Nehru Port Trust. The project has since been christened as Maha Mumbai SEZ (the "MMSEZ"). SKIL also won a global bid for development of another SEZ known as “Navi Mumbai Special Economic Zone” (the "NMSEZ") in an adjacent area.The NMSEZ, separated by a creek, is located just 300 meters away from the MMSEZ.

MMSEZ is proposed to be spread over 10,000 acres while the NMSEZ is proposed to be spread over 5,000 acres.

MMSEZ is planned to be developed as an integrated infrastructure facility with the goal of providing a straightforward industrial and commercial business environment for various business entities, along with providing excellent living, learning, healthcare and recreation resources.  

Reliance Group (Shri Mukesh Dhirubhai Ambani), has joined the MMSEZ and the NMSEZ projects and is now controlling both projects. SKIL has roughly an 8% equity stake in MMSEZ and approximately a 25% equity stake in NMSEZ.