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On the production side, they keep score on the progress of the travaux by the taux d'avancement (percentage of completion): the builder recognises revenue on this basis. Sales, OTOH, are recognised when they occur. Question here is whether they are applying the percentage-of-completion notion *by analogy* to the selling process as well as the building process, or whether 'commercial' refers to, e.g., the kind of property/project. (Do they develop shopping centres?)