Who would govern this "development"?
Go to a city like Manila, and you see malls five times bigger than a typical US mall (4 or 5 floors), surrounded by 30 to 50 story condos that house thousands of families. There are dozens of these 1st world complexes in 3rd world Manila, either complete or under construction. I’m pretty sure that’s what Trump envisions - the US can help manage the vision, but the Arabs need to pay for it.
“Who would govern this “development”?”
Rebuild Gaza using only green technology. It could be the beta test for implementing green energy around the world. Governments and private businesses can align to make this happen. It would be a new territory whose biggest feature is no material using petroleum products would be used.
Move the UN there. Praise the unified collaboration of governments and the Palestinian people. On the day of operations, hold a huge party.
Then nuke the place from orbit just to be certain.
>>Who would govern this “development”?
The various host countries (i.e. Egypt, Jordan, etc.)