A 43-story residential tower bound for the corner of Rainey and River Streets in downtown Austin's fastest-growing district announced its groundbreaking today -- but considering that site prep and crane installation were visibly underway at this future building's half-acre tract at 700 River Street since earlier this summer, we're just glad to see its developers finally making things official. Formerly known by the placeholder name River Street Residences, the 400 . . .
