Walls od Babylon, do the lose ability if upgraded?

[Rockit]

My question is if you upgrade the Walls of Babylon in a city owned by Nebuchadnezzer, say to a Castle improvement, will the increased ranged damage effect expire with the upgrade?

 

[filli_noctus]

No, buildings do not get upgraded so building a castle will not get rid of your Walls of Babylon.

 

[Rockit]

No, buildings do not get upgraded so building a castle will not get rid of your Walls of Babylon.

Thank you for the info!