New Zealand Law
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This depends on what your lease says about who pays for this. I assume you dont have your own insurance, because that is normally how you would claim this. Normally large windows like this are structrual and part of the outside of the building so covered by the landlord's insurance so should be his responsibility. So I suggest you check the lease and confirm what it says about this. Then if the landlord refuses to contact his insurance company then tell him you will be left unable to trade without the window, which may mean you cannot pay the rent, so it is in his inrterests to solve this.
He might say so, but that is a separate issue. And it wont help his rent arrears if your shop cannot trade so that is what you need to emphasise.