Here is a array house example with start and end cap. You can add more floors by increase the count in the array modifiers.
Have fun with it and feel free to use this house example for your project :)
Demo-Video: https://www.youtube.com/watch?v=jHN6Os0Ek9U
BLEND (Blender, filesize: 122 MB), OBJ (OBJ, filesize: 27.2 MB), FBX (Autodesk FBX, filesize: 27.2 MB), 3DS (3D Studio, filesize: 13.6 MB), DAE (Collada, filesize: 13.6 MB), OTHER (Other, filesize: 13.6 MB)