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The design of large building automation systems (BASs) with thousands of devices is a laborious task with a lot of recurrent works for identical automated rooms. The usage of prefabricated off-the-shelf devices and design patterns simplifies this task nowadays but creates new interoperability problems. As a result, the selection of devices is essential for a good system design but is often limited by a lack of information. This paper introduces a novel automatic design approach for large BASs that covers the device selection, interoperability evaluation, and composition of BASs. It follows a continuous top-down design with different levels of abstraction starting at requirement engineering and ending at a fully developed and industry-spanning BAS design.