Buildings in the Gri'x are built by anyone who needs one and can perform the task or arrange to have it performed. Sometimes the Land erects them when no one is looking. Buildings sometimes they grow from building seeds. This can be random, like weeds, or overseen by a qualified construction-gardener.
Like some members of the ambient races, some buildings never do achieve any sort of consciousness, but it is not uncommon for buildings to be sentient, in which case, they are classified as members of the genus Buildling.