Monaco Integrates 6-Hectare Mareterra Offshore Eco-District and Grimaldi Forum’s 6,000m² Expansion into International Business and Cultural Grid

A Generational Maritime Expansion on the Mediterranean Coastline

LARVOTTO, Monaco — Celebrating an extraordinary urban, environmental, and engineering milestone, the Principality of Monaco has fully operationalized and integrated the landmark Mareterra offshore eco-district into its prestigious cultural and international business fabric. Spearheaded under the high patronage of H.S.H. Prince Albert II and delivered by developer SAM L'Anse du Portier in collaboration with world-renowned architects Valode & Pistre and Renzo Piano Building Workshop, the multi-billion-euro project expands Monaco’s sovereign territory by six hectares (a 3% territorial increase) through pioneering maritime land reclamation.

Seamlessly extending between the Larvotto shoreline and the Portier peninsula, the 100% pedestrianized neighborhood has opened its public coastal walkways, the scenic Prince Jacques Promenade, Princess Gabriella Square, and lush Mediterranean landscaped parks to residents and international visitors alike.

Grimaldi Forum Completes 6,000m² State-of-the-Art Exhibition Expansion

A defining architectural and economic centerpiece of the Mareterra master plan is the grand expansion of the Grimaldi Forum Monaco, marking the premier convention and cultural center's 25th anniversary. Built directly into the offshore extension, the project integrates 6,000 square meters of flexible subterranean and ground-level exhibition halls alongside 2,000 square meters of outdoor seaside terraces.

The expansion increases the Grimaldi Forum's total commercial exhibition capacity by 50%, allowing the venue to host simultaneous world-scale congresses, high-level diplomatic summits, and elite international trade fairs such as the Monaco Yacht Show, Luxe Pack, and global cybersecurity conferences with uncompromised operational elegance.

Pioneering Thalassothermal Energy and HQE Sustainable Engineering

Mareterra establishes an unprecedented global benchmark for sustainable luxury urbanism. The entire district is powered by a high-efficiency closed-loop thalassothermal energy network, which harnesses the stable thermal energy of deep Mediterranean seawater to deliver 100% renewable cooling and heating with virtually zero local greenhouse gas emissions.

On the roof of the Grimaldi Forum and residential pavilions like Le Renzo, more than 2,500 square meters of photovoltaic solar panels generate clean electrical energy. Furthermore, the district features sophisticated rainwater harvesting systems, extensive shaded tree canopies comprising over 800 mature pines and olive trees, and certified low-carbon recycled building materials that earned Mareterra prestigious HQE Aménagement, BREEAM Excellent, and BiodiverCity environmental certifications.

Balancing Coastal Preservation with Long-Term Economic Autonomy

Monegasque government ministers and economic delegates emphasized that Mareterra and the Grimaldi Forum expansion provide an essential catalyst for the Principality's long-term prosperity. Crucially, the offshore reclamation was executed with unprecedented marine biology stewardship, including the relocation of Posidonia oceanica seagrass beds and the deployment of 3D-printed biomimetic artificial reefs along the seawall that promote marine biodiversity regeneration.

By harmonizing avant-garde bioclimatic architecture with Prince Albert II’s statutory commitment to reach national carbon neutrality by 2050, Monaco demonstrates to the world how dense coastal cities can expand sovereign borders responsibly while safeguarding the fragile marine biosphere.