Smart devices and tenant turnover

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How is everyone handling when a tenant moves out and has their smart phone connected to the Nest thermostat? My understanding is doing a hard reset on the thermostat factory resets it so the next tenant can connect to it. I'm not entirely sure how this works if the tenant added the thermostat to their Google account. Also replaced the garage door opener with a Chamberlain that is MyQ compatible and a Samsung Smart range. How does this work once a tenant moves out and added these devices to their phone?

Thanks,