There is lots of evidence that the Austin real estate market should be improving: inbound migration rates are extraordinarily high. Job growth is back. Inventory is declining. Rental rates are soaring. February's sales provide the first evidence that the market may be improving.We've updated the AustinTowers | TOWERS Realty Downtown Austin Condo Market Index for January and February, 2011. In January, the market was flat -- 6 units were sold at a slightly higher average price but a slightly lower price per square foot. Average days on market . . .