The big Austin downtown condo question remains: how big is the market for million $ condo units in downtown Austin?Some new market stats from Ki Gray of Escapeso Austin Real Estate provide some context on the high-end downtown market and it's performance so far in 2007.Here are the number of houses that sold for $1 million or more by year and that were recorded in MLS in the Austin metropolitan area:2004 - 152 houses2005 - 213 houses2006 - 341 houses2007 - 181 houses (1st Half of . . .