(sorry for my english i'm french) First you have to check that your 2 centrals can manage your house when it will be upgraded . After you have to see if yu have cars which are free in the same time . To finish,click on your upgrading icon !!
You have to increase the number of hearts for the house to the maximum by giving the occupants gifts so the people will want an upgrade Once the upgrade symbol appears over the house, just click on the service button in the tool bar that matches.
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