What is the fine-grained topic of the following text: The combined $73.4 million WA Athletics Stadium and State Basketball Centre, (completion late 2009) and the $483 million Perth Arena project (completion 2011) are now part of the VenuesWest portfolio with Challenge Stadium, Arena Joondalup, the Midvale Speeddome and Perth Motorplex. Only return the topic.
VenuesWest's addition of new sports venues to their portfolio.