I have always been offered properties the next day after submitting an application, so can't believe they took 10 days to tell you no. Sounds as though when you put yours in, they just waited to see if anyone else would put an application in before doing anything about it. What will you do now? Did they give you any indication of why you weren't chosen? Sure, they may not have to tell you legally, but it would help you to know. So would only be good manners to tell you IMO.