I apologize that I wasted everyone's time.
I found where the inside doorbell transformer is located. It is inside the coat closet, right by the front door.
I have looked inside this closet at least three times. This time, I removed the coats, got a step stool, and there it is.
Now, I hope I can get it to work. I don't like the battery operated ones because you can't get a pretty sounding chime.
Thanks everyone! I love this group.