From a report at the link below:
In late March of this year, President Obama stayed in Brussels, Belgium for about 24 hours on a weeklong trip through Europe.
Lodging at The Hotel in Brussels cost $1.5 million, as we reported in April, including rooms for the president and his entourage, as well as for the advance team in the weeks preceding the visit.
Less than two and a half months later, President Obama returned to Brussels again for about 24 hours for a G-7 meeting in early June, once again stayed at The Hotel, and again incurred a cost of $1.5 million. This time, the documents cited a need for "399 Lodging Rooms, office rooms, and conference rooms from 5/22/2014 – 6/6/2014".