Answered recovery of action.

[Edmund28]

I accidentally sell of 1 of my important building, can i recover back my mistake / building

 

[MinervaOz]

Contact support; they should be able to replace it for you.

 

[AstralSoul]

You have one strike, if its the first time, contact them, but they will be able to do it only once, so go slowly hehe (happened to me too when teleport was new.)

 

[Silmaril]

Just letting you know that only special buildings can at times be replaced, if it is a building that you can re-build form your buildings menu - these are never replaced as you are able to re-build them yourself.