The ranch has been disabled in the current version of the game.
The buildings will be removed soon and your players will receive the coins spent to build and upgrade the buildings.

You are advised to learn how the new ranch works in the upcoming AVH version.
In case you did not know, you can try this new version on http://v02.avirtualhorse.com

You can expect in the next days/weeks for features to gradually close in this version, in order to avoid conflicting with the new version.