Okay, in order to specify any sort of network you need more information that its in a single building!! Although that would be a valid question if you didn’t already know that.
1. What you now need to determine is how many floors in that building the network will cover?
2. Do you need 1 or more wiring closets due to cable length restrictions?
3. How many users is this network likely to support on day 1?
4. Growth of the network?
5. How many servers?
There’s quite a lot to understand but this will get you started.