Phased major renovation

I have a client that is phasing the major renovation of their facility due to the need to keep it in continuous operations. Each phase is separated horizontally (one long building) with firewalls and a single contractor will be performing all phases. it is anticipated that the five phases will be constructed over a 3-4 year period but subsequent phased construction cannot occur until the previous phase is complete - no concurrent construction of phases. We wish to pursue a single LEED NC certification for the entire project but are wondering if there is any issue doing so because of the phasing plan and length of time for certification.