Baufreunden, a project of office03, is one of the first building-group projects in Köln. The architects, who also live in the project, have aimed for quality in the typology, stacked wide maisonettes with either a garden or a roof terrace. In addition, they have drawn a few smart, simple rules for the facade. With the introduction of two windowtypes there was freedom of choice for residents and a consistent overall facadedesign. The inhabitants have made their own floorplans with or without the help of the architect.