furthermore, the scpea's definition leaves ambiguous the notion of 'building development' and whether the identification of multiple construction sites on a single parcel of land constitutes a subdivision subject to the review and approval authority of the planning commission. interpretations of this vary among american jurisdictions. subdivision developers may use an architect’s services only once, with the rest of the tract houses using the same master template: the resulting houses all look similar as in the above photograph of markham, ontario.