All the fundamentals
Your department needs a secure, performant, findable website that is expandable and usable (with clear workflows) so that changes in the organization can be effectively reflected in your web presence as they occur. Of course, you also need this site to be delivered at predictable costs. And, finally, you need to be able to get extra help when organizational pressures require your department to deliver at capacities that it may not be ready to support in a crunch.
These are the common, fundamental requirements. All responsible website teams and owners need the same things. But departmental content and marketing teams might need a little more...