Trump reportedly wanted to stay at The Four Seasons in the city, but the Saudis beat him to it and rented out all 156 rooms in the hotel.
The other luxury hotels across the city were fully booked.
The Park Hyatt is occupied by Russian strongman Vladimir Putin and his delegation.
Le Meridien is hosting Britain’s Prime Minister Theresa May. Right next door, at the Atlantic Kempinski, is Germany's Chancellor Angela Merkel and Canada's Prime Minister Justin Trudeau.
Trump is left to stay at a government-owned guest house off the beaten path, according to The Associated Press.
The president also had an embarrassing moment Thursday as he was left hanging by the first lady of Poland, Agata Kornhauser-Duda, following a speech.
While reaching for her hand to shake, she moved right past him.
After Trump appeared upset at her actions, Kornhauser-Duda came back to make sure there was no diplomatic incident.