In his work, Alexander seeks a way to return a sense of wholeness to the buildings and environments of modern Western society. He emphasizes that the crucial process is healing. Every new construction, whether building or square or street furniture or window detail, must be made in such a way as to heal the environment, where “heal” especially means “make whole.” The obligation is that the thing built must work “to create a continuous structure of wholes around itself”
This section really pertains to Heidegger's earlier point about people losing touch and awareness about the world around him. This passage also touches upon one of the quotes I annotated earlier about the continuities between building in dwelling. The two verbs need to be looked at as a whole in order for the environment itself to be "healed" or in other words made whole and continuous.