Networking 40,000 square feet and 10 non profits.

I need to rebuild the network of a 4 story, 40,000 sq ft building with 10 non profits ranging from 1-5 machines to a small college with 200 machines.

Right now each non profit gets their own internet service independently from two or three internet providers. Two of the biggest non profits are bringing in a single gigabit fibre optic line and many of the smaller organizations want to join in as it will be a considerable savings to the network expenses.

The building was built in the 70s and networked worked in the mid 2000s.

I have a good idea how I think it should be done, for the day-to-day cabling. But I'm curious how the experts in here wood setup the routers and switches.

I'm thinking going with a fibre optic switch because we should have 6 or 8 IP addresses and then giving big organizations their own routers. And and grouping all the smaller organizations with virtual LANS off a single router.

Any thoughts would be appreciated.

Thanks.