Heat oven to 350

 In medium bowl cream sugar and cream cheese until 
they blend well

Beat in 1 egg and lemon extract until mixture is light 
and fluffly.  Set this bowl aside.

In a large bowl, combine cake mix w/buttermilk, oil and 3 eggs. Beat on 
low 2-3 minutes

Pour batter in a greased 9x13 pan.  Pour cream cheese mixture on top of 
batter in 2 rows the length of the pan

wirl the cream cheese mixture 
ligtly through the batter with a knife.  Bake for 30-35 minutes

Cream rind and butter until well blended.

 Add 1 cup powdered sugar and 
blend.

Add lemon juice and remaining powdered sugar and blend very well 
until smooth.  Put on cake that is almost cool.