The Blackstone group is once again looking to the sell their Cosmopolitan Las Vegas property. And all you need to add this resort to your portfolio is a meager $5 billion… maybe more. It’s being reported that Apollo Global is exploring an offer. Another potential partner is MGM Resorts International. However, representatives for Blackstone, Apollo and MGM all declined to comment. Blackstone, the New York-based investment firm, tried two years ago to find a buyer at $4 billion or more. Prices for Las Vegas casinos have continued to rise despite the pandemic as real estate investment trusts purchase properties and…