Despite mixed economic news dominating the headlines, the downtown Austin condo market continues to strengthen. We've updated the AustinTowers | TOWERS Realty Downtown Austin Condo Market Index for July, 2011 -- a very strong month. With July's results, our seasonally neutral 12-month tracking index set a record for the highest average monthly sales and the shortest average days on market. This is good news for condo owners: liquidity is clearly increasing for inexpensive and recently constructed units.In July, condo sales increased 29% from the same month last . . .