Brussels-Capital Region: The island means a portion of the communal territory whose faces are bounded by the sides of streets and / or boundaries of municipalities. The contours of the sidewalks are not included in the islets. Roundabouts and central berms are not islands. Blocks correspond not only to urban areas but also areas of wasteland, the Land, area railway and subway, green spaces and water bodies, galleries.

Brussels-Capital Region : building means any physical construction formed of rigid exterior walls, roofed, permanently attached to land, and designed to accommodate human activity and / or shelter for animals, goods and machinery.