The tenant acknoweldges that he knows that the beginning of the term of rent in this contract is based on the date when the Landlord will receive ownership of a house being built. Should the ownership of the new house be delayed due to a reason not in the control of the landlord or the Contractor including a war or an attack on Iran or its branches in Sinai, Gaza and Lebanon, directly or indirectly, and/or due to national "downtime" due to any of the reasons listed above, the beginning of the term of rent will be delayed according to the delay caused by the events, but not for more than three months.
This type of clause isn't that unusual in Israel. Most large contracts have some clause providing for a war breaking out. I've even written in the past about a clause for a renter to vacate his apartment should the Messiah arrive. What is more unusual is that an attack on Iran is spelled out.