What the provision is supposed to say
The insurance proceeds on a block are held by whoever insures it, usually the landlord, and are applied to rebuilding. If rebuilding is impossible — the site is lost, consent cannot be obtained — the leases should provide for the money to be divided among the parties who have lost their interests.
The defect here is in the timing rather than the principle: the lease makes you wait a stated number of years after it becomes clear the building will not be reinstated before you can claim your share.