Extending a relationship that began with Blackstone Group’s founding back in the mid-1980s,  Simpson Thacher & Bartlett is taking yet another turn advising the private equity and financial services behemoth in a multibillion-dollar transaction.

This time, Simpson Thacher is advising funds managed by Blackstone in the acquisition of Dream Global, a real estate investment trust, in an all-cash deal valued at $6.2 billion. Mergers and acquisitions partners Brian Stadler in New York and Wheatly MacNamara in London are leading the Simpson Thacher team.