Look at the physical needs of each department, and remember to build flexibility into your plan. Pay particular attention to the production area, because it is experiencing the greatest impact of new technologies. All three divisions need to be physically able to react to and adapt to these changes. An aged facility might include interconnected buildings from several generations. Room sizes were set by a previous paradigm.
Traffic flow can be a real problem, infrastructure is taxed to the limit, and so on.
Evaluate the chokepoints to further growth, and work towards a plan for the ideal future facility. A first step would be to list the advantages of each of these options, and choose the most attractive. In the case of consolidated facilities, these limitations can affect the whole. This may actually lead you to maintain some separation between functions, rather than take the intuitive approach of maximizing consolidation to maximize economies of scale. These restrictions probably won't affect your studio or office construction plans, because most good transmission sites are not good studio or office locations anyway.