'Overvalued' or rather 'overpriced'?
Real estate just as any other market instrument can be objectively overpriced.
Asking price is often set higher to pad for negotiation, as giving a discount is a phychological incentive for a buyer.
As for 'overvalued', that's seems to be a subjective concept. Value is static until it's exercised. If you hold a $100 in your wallet, it does not matter (save for a fear of losing it) until you show someone else that you have it, as basis for some value transaction.
Can you overvalue a $100 ? Sure, make it a collectible, put a celebrity's signatue on it etc. Provide future reasons for it to hold a higher value. Use it as a basis to borrow $200 (even though that $100 may have being borrowed itself).
In a way, real estate has become a fiat just as the actual currency is. While the dollar is a short-time instrument so its value could be exercised immediately, real estate functions as a long-term instrument to transact for a future value. That value is in form of taxes for government, interest for banks/lenders, rent cash-flow, or a potentially higher selling price for the owner.
As for the owner-occupied house, it can be seen as being more a liability than an asset.
Do you believe that a newly listed property does not hold your expectation of its future value? Well, the seller has not promoted that value to _you_ convincingly enough.