More From Sinéad Baker
His farewell party is taking place in an 80,000-seat stadium.
Former Starbucks CEO Howard Schultz Says He's Considering a 2020 Run 'to Restore Dignity and Honor Back in the Oval Office'
He isn't worried about people's criticism that his potential run could inadvertently help President Donald Trump win re-election.
Obama said the 'lean in' approach for women in the workplace isn't always enough for women.
Affected hotels include W, Sheraton and Westin.