President Obama is taking a cue from Donald Trump ... he's building himself a wall.
We got photos of construction at Obama's soon-to-be D.C. rental. You also see construction in the garage. It will become an office with a bathroom.
The rental will be home until Sasha graduates so the Obamas needed the property outfitted for the Secret Service and ... it needed more fortification.
BTW ... he's getting a new neighbor. Ivanka Trump and family, they are moving nearby to a rental.