Was the top floor custom made or another building added on-top? The balcony is nice 
The top floor is made using the interior of the Sarissa Warehouse that I have, donated to the cause by Legionnaire Bert.
If you look you will notice the main 'front wall' of the upper storey and the 'balcony'...


...whilst the lower floor of the interior provided the rear and side walls of the new extension.
The gantry railing was cut up and became the side 'windows' on the upper extension.
Strips of basewood were added to provide detailing and break up the rather flat appearance.
The railings at the front of the new building were also taken from the Warehouse.
The warehouse will be utilised soon, but as I do not use interiors I decided to make use of these 'extras' for this.