Castiglioni did not purchase BMW's premises in his transaction with Knorr-Bremse. Instead, he merged his Bayerische Flugzeugwerke (BFw) into BMW and established BMW's factory and headquarters at BFw's premises. BMW was moved into the same buildings of Gustav Otto's former Otto-Flugzeugwerke on Lerchenauer Straße 76. BMW's headquarters have been at that address ever since