UPDATE 11/07/2011 1940:
I've noticed Evernote is currently under maintenance so here are the homework:
1) You need to identify a place/location for the building that you want to built. (WHERE)
2) You need to research on what are you going to build on that space/what building you going to modify the existing building to. (WHAT)
3) You also need to explain, elaborate, analyze the reasons for the decisions made.
4) Lastly, you need to research on existing design and use them as reference in your own design.
e.g. if you are designing a restaurant, you would research on what are the existing design of restaurants and think of how you can make your design unique and innovative.