Preheat your oven to 325°F (163°C).
Grease your loaf pan with butter or cooking spray and line the bottom with parchment paper.
In a large mixing bowl, beat together the cream cheese and unsalted butter until light and fluffy, about 3-5 minutes.
Gradually add the sugar, then stir in the lemon zest.
Add the eggs one at a time, mixing well after each addition.
In a separate bowl, whisk together the all-purpose flour, then gradually add to the wet ingredients.
Stir in the vanilla extract, lemon juice, and lemon extract (if using).
Pour the batter into the prepared loaf pan and smooth the top.
Bake for 60-70 minutes, or until a toothpick inserted in the center comes out clean.
Prepare the glaze by mixing sugar, water, and lemon juice in a small saucepan over low heat until the sugar dissolves.
Allow the cake to cool for 10 minutes, then remove from the pan and place on a cooling rack. Drizzle the glaze over the warm cake.