The truth is is probably some inheritance. Real estate in Israel is insanly expensive, Jerusalem was ranked as the most unaffordable city in the world (Tel Aviv was up there too).
New York was also on the list, however at least people in NY can sometimes make enough money to pay the insane real estate as the jobs are good. This is not the case in Jerusalem where good high paying jobs are not available.
Ive seen apartments in some desireable neighborhoods like Rehavia in Jerusalem going for over a Millions DOLLARS (Real Estate in Israel is priced in Dollars not Shekels). People in Jerusalem dont make that kind of money. The higher paying jobs in Israel are in the Tel Aviv-Herzyliah area.
I was told rentals in Israel are more reasonable