Many apartments that are being rented are those that house people otherwise, Paris being very well known for emptying out in July/August. For those that are being held back to rent, it can probably be hard to know what's the truth, "we didn't find a tenant" versus "we didn't want to find a tenant."

Also, I think there's also a benefit to the government, as they want to have this empty short-term housing stock available for tourists coming in. A lot of money is being invested in the games, it's important to get the tourism money to make it profitable.