We have lots of updates today on the state of sales at the leading downtown projects:- The W Austin Hotel & Residences, which is currently building a sales center at Block 21 in downtown Austin, reports that about three-fourths of the 196 condo units have been reserved with a deposit. Construction of the building will begin in October.- At Spring Condominiums just south of Whole Foods, 40% of the units are under contract. They report that they have sold out of all of the lower priced units. The building broke ground last month.- At 360, the 44-story tower . . .