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These buildings are distinguished by the structural clay tile used in their wall construction . The overall goal here is to uncover how anisotropic wall yielding is conditioned by the structural elements of the cell wall . The seven different commission slots are filled by a structural engineer , a licensed architect , a residential tenant , a residential builder , a residential landlord , a community based non-profit housing developer , and a member of the general public at large . The mechanism generating the macro-effect " market equilibrium " also depends on structural features , such as the existence of a plurality of competing producers and the absence of political price fixing ; the rational decisions of individuals to offer or buy are the " material stuff " of the process , but its shape is determined by these structural elements .