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First of all, ask yourself if you mean over the building or throughout the building. If you want to spread WiFi all over the building, you're going to need to buy a very big umbrella. WiFi is invisible light, so you need to remove all the visible light or else there won't be enough space for the WiFi.
If you want to spread your WiFi throughout the building, you need to be a bit more strategic. Much like outdoor WiFi, indoor WiFi doesn't like the light. It will congregate in places where ambient light is occluded, such as the corners of rooms and where the walls meet the floors and ceilings. You won't get much WiFi inside the parts of the room that matter when that happens. If you have enough power bars, you can point lamps towards the corners and walls. You should also make sure to move your kitchen appliances into the center of the room, as the WiFi might hide under them.