In July, more than 100 Austin condo buyers reserved units in projects such as the Austonian, the Four Seasons, and the W Hotel & Residences. All three of these projects have one thing in common: they are currently empty lots. Actually, in the case of the Four Seasons Residences, the building site is currently a very busy hotel parking lot.In the current hot condo market, top projects will sell out before the first ceremonial shovel of dirt is removed from the lot. In these circumstances, buyers will be required to pay deposits years before they will be able to . . .