Corporate Site w/ multi businesses. PHP, Graphics, Java, Perl, etc.

I need to have a central corporate website built and within it I need to incorporate several businesses. In this project I need a real estate brokerage site (i.e. [login to view URL], [login to view URL]), automotive dealership site (i.e. [login to view URL], [login to view URL]), an online store (OSCommerce?), Lodging booking site (i.e. [login to view URL]) and data management site for entertainment like pics, vids & games (i.e. [login to view URL]). A more detailed description of what I'm looking for is inside the file, "website.doc", which is attached. Thank you.