The Blackstone Group is regarded as one of the most likely candidates to consider a higher offer.
And there is talk of a $12 billion fund from the Blackstone Group.
It is owned by the Blackstone Group, a private equity firm.
It is unclear why certain firms received the letters and others - like the Blackstone Group - did not.
The building was owned between 2005 and 2010 by the Blackstone Group, a real estate firm well known for their management of high risk assets.
He is currently a general partner in the Blackstone Group, an investment banking organization.
Chairman and co-founder of the Blackstone Group, an investment firm.
And no one is feeling more on top of the world than Blackstone Group.
Travelport itself was acquired by the Blackstone Group earlier this year.
A representative of the Blackstone Group was not immediately available.