The political deal ensures a majority for the PSC in next week's vote. Junts highlighted that the negotiation has secured greater heritage protection for the Palau Marcet and a significant reduction in commercial use, which will drop from 25% to 16% of the total area.

The architectural project, led by OUA and Casper Mueller Kneer Architects, includes the full restoration of the facades. The museum will house Carmen Thyssen's private collection, focusing on the history of Barcelona and the Eixample district, alongside temporary exhibition spaces and an auditorium.