As others have stated, such information is not available.
What would be required is for each sold home to be researched to determine date of construction and apply the building standards in place at that time. Or one would need to drive by each home and put eyeballs on it to determine the construction type and method.
Then comparable studies can be completed.
This is valuable information and worth the price required to obtain it. After all, this is a business, not a hobby.
What is not addressed is the looming 20% annual increase that is permitted and can occur regarding flood insurance. A home buyer needs to realize in 5 years the $8,000 flood insurance can go up 20% annually for five years then market rates will apply. A 1963 constructed home owner can be presented with an $80,000 flood insurance premium. (Last quote for a home in Clearwater, FL) Note: Home valued at $287,000.
Homes in flood zones have been placed in a extended state of uncertainty which will prove more damaging to values than if market forces were allowed to prevail from the start. It is the unfortunate homeowner on the other side of the street from the big water view that will get clobbered.
Pick up the phone and give a local REALTOR a call and commission them to do the research for you.
Best of success,