Buildings are the fabric of our cities, generating one-third of all emissions, yet they are not on track to meet the Paris Agreement goals. The sector holds immense untapped potential—providing 40% of the solutions needed to double energy intensity improvements while enhancing lives for everyone, everywhere. The BuildingToCOP Coalition has sent a letter to Ambassador André Aranha Corrêa do Lago, urging him to include a dedicated Built Environment Day at COP30.