Write If/And statement for userform textboxes that are only visible

I am trying to write an "if + and" statement that is like the following. (This is all for a userform)

Upon the user hitting the submit buttton:

Sub cmdGO_click()
   If CheckBox1.Value = False And (only the visible textboxes that are blank)
         msgbox "warning"
End Sub

it ths only visible textboxes that are blank I am having trouble with and dont know how to code.

Those textboxes that are named (and visible -which is dyanimic):

    For y = 1 To Me.tbxBuildingcount
        Me.Controls("Textbox" & y).Visible = True
        Me.Controls("Label" & y + 4).Visible = True
        Me.Controls("tbxSQFT" & y).Visible = True
        Me.Controls("lbSQFT" & y).Visible = True
    Next y

and tbxBuildingcount is just a value from a spin button.


I am just trying to error trap and make sure that the user has filled out every visible textbox and if they dont, then warn them that they do.
The reason for the checkbox is that is it is true, then they can proceed. But if false, and some blank textboxes, they get this warning.

Thanks in advance.