What is the Purpose of Your Fictional Station?

What your fictional space station is used for dictates how it looks, to an extent, as well as what rooms are needed.
If your station is a hospital it probably has the typical hospital colors, depending on your species, and you’ll have to decide how typical hospital wings are worked into your design. Does your station look like a building with different squares coming off the center diagnostic area or are the sick children merely put on different floors than the dying adults or pregnant mothers? A hospital would likely have less of a need to have a huge Operations Department but the Administration Department may be the second biggest Department below the Medical Department on your station. If your station is a trade hub it may have a huge diplomatic area or business area with a few hotel variations but a small group of people caring for and running the weapons while a large department runs the docks, keeping ships on schedule and paying their dues. If your station is an amusement park in space, you are going to need a lot more electricity and hotel areas than if your station was merely a port to stop in to repair broken parts before continuing on to the next port. Each type of station would play a part in how it looks and how big it is as well. A child’s amusement park may look like a cartoon character’s head while an adult’s amusement park may look like another part of a person’s anatomy, depending on the species, and the repair port may not look too pretty but have cranes sticking out of the station at every angle.
As you decide the purpose of your fictional space station remember to keep in mind the effect it will have on everything else onboard, such as the look of the station from space and engineering needs.