> Will I have to pay gift tax on the proceeds from the sale of both sites
No. The value of the sites would be assessable for gift tax but the parent to child exemptions may mean that there is no actual gift tax liability.
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You would then be liable for CGT on any gain arising from the sale based on the difference between the disposal price less the assumed acquisition cost (market value at the time of transfer - I THINK!) (less the usual annual CGT allowance of €1,270, any allowable expenses, any previously incurred capital losses etc.)
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If your father sold the sites then he would be liable for CGT on any gain (sale price less acquisition price indexed for inflation up to December 31st 2002, less annual CGT allowance, less allowable expenses and previously incurred losses etc.) and the cash gift to you would be assessable for gift tax but perhaps under the relevant exemption limits.
Sounds like it could be more tax effective all round for him to gift the sites and for you to sell them rather than him selling them and gifting you the money.
Disclaimer - I am not a tax expert so if in doubt get independent, professional advice on the tax and/or investment aspects of this situation.
ALSO - the fact that farmland is involved may mean that other tax treatment or exemptions apply!