At the moment there isno optionin Hay Day to store, sell or delete buildings and animals – as each and every building and animal you purchase has apurposeon your farm.
Using your buildings to create products and feeding your animals will provide therewards(coins and experience points) that help you to complete those deliveries and orders that help you progress through the game!
You can howeverstore decorationsin order to make room for more machines or other decorations. They will be kept safe and can be retrieved easily from storage through the decoration tab in the in-game shop. This way you can safely store and re-use those seasonal decorations which are only available for a short amount of time in the game.