Гримасы рынка

Смотрю от скуки на zillow.com. Один из домов в Саннивэйле:

Sales History

03/14/2008: $580,939 *
10/02/2006: $680,000
01/31/2002: $485,500
06/17/1994: $245,000

* Transaction Not Included in Zestimate
This transaction was not used in computing the Zestimate for this house due to anomalies we detected with this transaction. These anomalies can include unusual document or transaction types, sales between possibly related parties, unusually high or low transaction prices, or other data irregularities that might indicate the transaction is not a full-value, arms-length transaction.

При этом он сегодня выставлен на open house с ценой $583,900. Интересно, это как?