Note: Paper floor removed for clarity

In real life, a building has to be built to rules. For example, it has to

Fit onto a particular area of land.

Have a certain floor area.

Accommodate people and equipment.

Have doors and windows.

Rules for Structure

Your model only needs to include the main structural frame of a building. You do not need to add the walls on the outside of the building or stairs within.

Your model can be any shape you like, but it must follow these rules. (Why ?)

It must have at least 4 horizontal floors, with MDF edge beams defining all boundaries of the floor. A flat roof will be treated as a floor. You can use the base as the ground floor of your model. Note that when the base acts directly as a floor, MDF edge beams are not required at the boundaries. (Show Me)
Not counting the ground floor, the total area of all of the other floors must be between 750 cm² and 950 cm². The floor area includes the space taken by the columns. The maximum area that is allowed for each floor above the ground floor is 320 cm².
The distance between the top of any floor and the bottom of the floor structure above must be at least 15 cm (Show Me). The fixings required for the steel blocks in the Rules for Vertical Load do not count as part of the floors.
You must leave the 25 cm square MDF base board solid. However you may drill up to sixteen holes in it to help fix your model to it. The diameter of the holes must not be more than 8mm.
You must leave 12 mm clear around the edges of the MDF base board, so that your model can be fixed to the shaking-table with clamps. (Show Me)
In a real building, you would need windows in every storey. So for each storey of your model, half of the outside perimeter must be left completely clear of any materials between the top of one floor and the bottom of the floor above. To help understand this rule, imagine being able to fit full height windows (with clear views) around half the perimeter of each storey. (Examples)
In a real building, people need access to all rooms on each floor. Allow for this in your model by by making sure that access in not blocked by partitions (Show Me), or crosspieces (Show Me) or any other parts of the structure. You must leave enough space for at least one doorway 10 cm high and 4 cm wide into any rooms that you create.