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This is done using gems which you have earned from your existing houses. If you are low on gems leave the game and return later as there is a steady supply of gems coming in from your existing houses at all times.
When you need a very specific item and it is not showing you may want to consider trying a different house and different set of objectives.
These can be purchased using in-game coins or they can be earned through completing bonus objectives. Try to resist the temptation of purchasing them with real money as they can always be earned through regular play.