Yep. The Hawaiian house was bought for him back in 2013 by Penny Pritzker and friends. Its the Robin Masters estate of Magnum P.I. fame.
http://hillbuzz.org/who-is-funding-the-purchase-of-the-35-million-beachfront-hawaiian-estate-for-barack-and-michelle-obama-to-move-into-come-january-2013-2013
https://en.wikipedia.org/wiki/Penny_Pritzker
As far as the Dubai place goes that is debatable. A US Admiral was “retired” within hours of suggesting a Obama connection. It was in the Palm Jumeirah development.
https://www.luxhabitat.ae/villas-for-sale/dubai/palm-jumeirah/
Dubai would be a nice place if he yearns for the sweetest sounds he ever heard
http://www.nytimes.com/2007/03/06/opinion/06kristof.html
Another plus for Dubai is its in the UAE and has No Extradition Treaty.
Don’t forget about his home in CHICAGO.
Is there some law about giving a sitting PRESIDENT multi-million dollar gifts?