1. Your value of the trees can be any reasonable method.
2. The cost to restore the property value is a reasonable method. So, yes, that would be a good basis for your claim.
See Topic No. 515 Casualty, Disaster, and Theft Losses - Internal Revenue Service for full details. Which includes
If your property is personal-use property or isn't completely destroyed, the amount of your casualty loss is the lesser of:
- The adjusted basis of your property, or
- The decrease in fair market value of your property as a result of the casualty
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