Because of similar floor-to-floor heights of 3.95 metres for the concrete and steel alternatives and the same vertical interval for accommodating services, there was no significant variation in costs for services. Multiplex, the builder on the project, then made the call for the steel version, and the detailed design was done. There was a tight program for this job, and Multiplex felt there was a lower risk with the steel option as more of the components could be fabricated off site.
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