The base targeted by Hezbollah on Tuesday was the same one it has struck in previous attacks and there was no other sign so far of wider military retaliation by the group.
A security source told Israel Hayom that the shift reflects Israel's desire to reduce UNRWA's role in managing civilian life in the Gaza Strip as much as possible.
His death marks the loss of 238 IDF soldiers since the start of the ground invasion in Gaza.
Two women were seriously wounded, the head of Israel's ambulance service Eli Bean told public broadcaster Kan.
Ironically, UNRWA expects employees to "uphold the highest standards of neutrality and integrity."
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The military says it received "credible information" that Hamas held hostages there and that the remains of hostages might still be inside.
The rocket attack in the Safed area also hit a base. IDF officials are investigating why there was not enough time for the soldiers to reach a protected area.
A laptop found by IDF troops in Gaza shows that Mohamed Washah is a "prominent commander" in Hamas' anti-tank missile unit.
The US president is said to disparage Netanyahu in private conversations citing his frustration over IDF's actions in Gaza.