We launched the New Property Dashboard couple of weeks back. We received many suggestions from the players that they would want a “Collect All” button in new Property Dashboard on the Mafia Wars home page. With this button you can collect from all your properties in all the cities at the same time. On clicking this "Collect All" button, a pop up will show you what you have collected from all the cities and the timer will indicate how long you need to wait until you can collect again.
Thank you all for your valuable suggestion!