Fifth ENI Office Building

The Fifth ENI Office Building is a corporate office complex in San Donato Milanese comprising three connected towers. The structure houses administrative workspaces, meeting rooms, an auditorium, and dining facilities spread across multiple levels.

The building opened in 1991 as part of the energy company's headquarters expansion in the region. Its construction marked a major infrastructure development for the organization during that period.

The architectural design of the building incorporates elements reflecting the industrial heritage and corporate values established by Enrico Mattei.

The building is not open to the public and functions solely as a private office space for employees and business activities. Visitors can appreciate the architecture and design from outside while walking through the nearby areas of the Metanopoli district.

The building incorporates solar panels and geothermal systems for energy generation and efficiency across its surface. This technology was uncommon in large office complexes when the facility was completed.