Concrete silo for offshore drilling and production operations includes a reinforced concrete foundation secured at the seabed by steel piles and steel anchors embedded into the seabed. An exterior vertical reinforced concrete wall is supported by the foundation. An interior vertical reinforced concrete wall is supported by the foundation and houses a central cell. A series of radial shear walls extend between the exterior concrete wall and the interior concrete wall to form a series of perimeter cells. A roof and series of horizontally extending service platforms are supported off of the outer concrete wall and the interior concrete wall. A series of vertical well casings extend through the concrete foundation and down into the seabed for drilling operations.