Marina Bay Sands Pte. Ltd. (MBS) is looking to sell 49% of its stake in the plush Shoppes mall at a price that could make it the most expensive retail property in the world. Las Vegas Sands Corp. (NYSE:LVS), the parent company of MBS, wants $3 billion to $3.5 billion for the stake, but it needs the green light from the Singapore Government before a sale can take place.