Looks funny, doesn't it? The texture is actually made up of a number of different textures, but at the moment all of them show up on the box. We can fix that.

UNWRAP THE UVW.

What? Here is a description of UVW:
To apply a material that contains maps to an object, the object must have mapping coordinates. These coordinates specify how the map is projected onto the material, and whether it is projected as a "decal," or is tiled or mirrored. Mapping coordinates are also known as UV or UVW coordinates. These letters refer to coordinates in the object's own space, as opposed to the XYZ coordinates that describe the scene as a whole.

With our box selected, go to the Modify panel. In the dropdown Modifier List, select Unwrap UVW. Our box will effectively 'unwrap' so that each face can be given a separate portion of our texture.

Expand Unwrap UVW in the stack, and click on Select Face. Now click on the first face of our box, and click Planar Map. Now repeat this for each face - don't worry about the bottom of our building, we won't need to apply a texture, so just select each of the four sides and the top, pressing Planar Map after each selection.

Now, if you drop down the Named Selection Sets Dropdown, your five faces should be listed as PlanarMap0 to PlanarMap4.