Combine the cookie crumbs, sugar, and melted butter, and press into the bottom of a 9-inch springform pan. Bake for 15 minutes at 350°F, and then allow to cool completely.
Beat the cream cheese, sugar, and cornstarch. Next, add the eggs one at a time. Finally, mix in the sour cream, lemon juice, lemon zest, and both extracts.
Spread the cheesecake filling evenly in the pan, and bake for 15 minutes. Then reduce the oven temperature to 200°F and bake for 2 hours to 2 hours 10 minutes, or until set.
Remove the pan from the oven, and run a thin knife around the edges. Return the cheesecake to the oven, turn off the oven, and leave inside for 2 hours. Then chill in the refrigerator overnight.