Been doing a little more research in to some of these former...

Been doing a little more research in to some of these former companies that Brett Mitchell has been involved with and have a question. Is its normal for multiple companies to to share the same physical address and even P.O. box??
MXC shares Level 7 1008 Hay Street Perth WA 6000 with DCC, TMK and TSV and all 4 share the same P.O. box of PO Box 7209 Cloisters Square PERTH WA 6850
MXC, TMK, and DCC also share the same phone number of +61 8 9389 2000.
He is still on the board of DCC, but has left the other 2, TMK and TSV look close to failed, DCC has a revenue stream.
Hay Street is also the registered address for Verona Capital.