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My oldest son's favorite book at our first Library thirty years ago was called "One More Block":
The child in the book stack the blocks hgher and higher and higher until he needs
to finish the tower.........
I've looked for this treasure in other libraries where we've lived over the years
submitted it to used online book stores, combed through sales (not too often).
I'd love to find it again.
I think the book you're looking for is called Just One More Block by Patrick Mayers. Looks like it's out of print and the only copies I could find on Amazon are really expensive. Good luck.