please review this FAQ from the IRS. So as long as you were in a federally declared disaster, it appears you are eligible for the casualty loss, given the limitations below. There is nothing I found that separates 'view' from the value.
But note the loss is limited by the cost basis, i.e. let's say you bought the land and house for $100,000; the day before the disaster, the land + house was worth $1,000,000 with the home insured for $250,000. Now it's only worth $200,000 after the insurance proceeds for the loss of the structure. The casualty loss would be zero because the cost basis was $100,000 and the insurance proceeds of $250,000 reduced the cost basis to zero.
so what they IRS is saying is that while it will cover your original investment loss, it will not cover the appreciation that occurred since the purchase that is now lost.
take the 2003 purchase price and add in any improvements you made subsequent to that date and then subtract the insurance proceeds. Then calculate the change in value from the day before to the day after the fire (net of the insurance proceeds.) The lower of the two is the limit of your casualty loss.
https://www.irs.gov/businesses/small-businesses-self-employed/faqs-for-disaster-victims-casualty-loss-valuations-and-sections-165-i
(6/1/07) Q: Section 1.165-7(b)(1)(i) indicates the decrease in fair market value is the difference between the property’s value immediately before and immediately after the casualty. What constitutes “immediately after”?
A: To compute the deductible casualty loss, taxpayers need to determine: (1) the difference between the fair market value immediately before and immediately after the casualty; and (2) the adjusted basis of the property (usually the cost of the property and improvements). Taxpayers may deduct the smaller of these two amounts minus insurance or any other form of compensation received or expected to be received. One method of determining the decrease in fair market value is an appraisal. An appraisal must reflect only the physical damage to the property and not a general decline in the property’s fair market value. See § 1.165-7(a)(2)(i) of the Income Tax Regulations. Taxpayers may also use the cost to repair or clean up the property (cost-of-repairs method) to determine the decrease in fair market value caused by the casualty. See § 1.165-7(a)(2)(ii).
here is a link to the federally declared disaster areas, so your's must be listed here to qualify for a casualty loss:
https://www.fema.gov/disasters/year/2018
ps sorry you had to go through this headache.