"Before and After" Appraisal Methodology
If I read and understand your original post correctly, the area that has been donated as Conservation Easement was classified as Wetlands to start with.
As wetlands, they were not buildable. Land that is not buildable, at best, has a nominal value. In order to determine the value of these unbuildable areas, the appraiser cannot use buildable lot sales as comparables. The appraiser would use other wetland sales as comparables, and those wetlands will have a value that is but a small fraction of a buildable lots value. This would provide the "Before" value.
Then the appraiser would establish what the "After" value is by again using comparable sales that are not buildable (e.g. wetlands and lands with CE's on them that were sold in "arms-length" tansactions). In other words, the appraiser would be utilizing the same sales that were used in the "before" portion of the analysis.
The value of the Conservation Easement (this is the amount that you would be claiming for a tax deduction or write-off) is the difference between the two values.
That difference would be zero or close to zero.
In essence, you did not give anything away when you placed a CE on the property.
What appraisers value is Property Rights: the right to use a particular peice of real estate - to occupy it, to rent it, to build upon it, to mortgage it, to further improve it, etc.
Many of those rights didn't exist prior to placing the CE on it due to their wetland status and they don't exist now that they are eased.
Save your money. A properly done Before and After appraisal will not provide a value worthy of a significant tax deduction.
And if you get an improper B & A appraisal that claims a significant value, it will still have to be reviewed by an experienced IRS Appraisal Reviewer that will more than likely disallow it. That is certain.
You bought a pig-in-a-poke.
A knowledgeable buyer (the one that is described in all definitions of "Market Value", which we appraisers MUST define in every market-value appraisal that we do) would have bought the property "subject to" receiving all approvals and commitments for financing prior to taking possession of the property or would have taken an "option" on the property, subject to all approvals. You didn't - and based upon your experience, there is no way that you would ever purchase another similar peice of real estate without these fail-safe contingencies.
A good education is expensive. You played Russian Roulette with a non-mainstream parcel of ground. So far, you've only shot yourself in the foot. Get out of it before you shoot yourself in the head.
Good luck,
Pat Murphy