The Architecture of San Siro Stadium: The Third Tier

The Project That Changed Everything

In 1987, Italy was awarded the task of hosting the 1990 FIFA World Cup. San Siro Stadium, already the largest in Italy, needed a radical modernisation to meet FIFA standards. It was the opportunity for a transformation that would make it a world architectural icon.

Architects Giancarlo Ragazzi and Enrico Hofer were commissioned. Their challenge: add a third tier above the existing structure without demolishing the stadium and while maintaining operations during construction. The solution was as brilliant as it was bold.

The 11 Towers: The Brilliant Idea

The main problem was structural: how to support a third tier of 25,000 seats above a building not designed to bear it? The answer: 11 cylindrical reinforced concrete towers, planted around the stadium's perimeter, supporting the new tier independently of the original structure.

The towers became the recognisable symbol of San Siro worldwide. Their helical ramps serve both as load-bearing structures and as access routes for third-tier spectators — an elegant solution to a complex engineering problem.

Tower Facts

• 11 cylindrical towers arranged along the perimeter
• Height: ~50 metres each
• Diameter: ~9 metres
• Function: load-bearing structure + access ramps to the third tier
• Illuminated at night: creating San Siro's unmistakable skyline

The Roof

Ragazzi and Hofer also designed a partial roof for the third tier: a lightweight steel and polycarbonate structure in the shape of "petals" that protects third-tier spectators from rain. The roof, together with the illuminated towers, creates San Siro's unmistakable silhouette as evening approaches.

The 1990 World Cup: The Inauguration

The works were completed in time for Italia '90. The renovated stadium hosted the opening match of the World Cup (Argentina vs Cameroon, the famous defeat of the reigning champions) and a semi-final. Capacity rose to 85,700 seats.

For all historic events in detail: Complete History of San Siro Stadium.

Technical Data

Feature	Pre-1990	Post-1990
Tiers	2	3
Capacity	~60,000	85,700 (later 75,923)
External towers	0	11
Roof	No	Partial (third tier)
Global recognition	Regional	Worldwide 🌍

The Debate: Preserve or Demolish?

The third-tier architecture is at the centre of the debate about San Siro's future. The heritage authority has begun a process of architectural protection for the 1990 structures, considering them works of historical and artistic value. This complicates new stadium projects that envisaged total or partial demolition of the Meazza.

For many Milanese, San Siro's towers are part of the city's identity — demolishing them would be like tearing down a monument. For others, the stadium is now inadequate and needs a modern replacement. The debate continues.

Influence on Other Stadiums

The design by Ragazzi and Hofer has influenced stadium architecture worldwide. The concept of external towers as independent load-bearing structures has been replicated and reinterpreted in numerous subsequent venues. San Siro remains the original — the trailblazer.