Airport control tower can be destroyed too easily with small explosives that in real life rely on shrapnel to do damage.
Airport control towers can be destroyed to the state that the top floor collapses with
- 10 hand grenades thrown in through the bottom floor door
- 10 rifle grenades (40 mm rifle grenades) fired at the building wall from the outside
- 10 20 mm cannon grenades from AH99 helicopter fired at the building
None of the above grenades have the explosive power to make that kind of structual damage that will bring down reinforced concrete buildings. And the tower is made of reinforced concrete, you can see it easily from the destroyed model.