The initial moving costs would be about $40 (5 gallons of gas, currently $8.28 per gallon), to drive the removed placard from the old Tel Aviv embassy building to Jerusalem to put it on the new embassy.
Perhaps an additional $1.59 if a new set of screws are used.
Sarcasm?
We already have an office building in Jerusalem.
We only have to change the sign on the door.
Plus, we get to rent out or sell a fairly large building in Tel Aviv.
A plus all the way around.