Today the AIA released the December results of its Architecture Billings Index (ABI), and we’re happy to report that the overall score is holding steady in positive territory for the second month in a row. Like November, December’s score came in at 52 (anything over 50 is positive). But AIA Chief Economist Kermit Baker remains circumspect, noting “We saw nearly identical conditions in November and December of 2010 only to see momentum sputter and billings fall into negative territory as we moved through 2011, so it’s too early to be sure that we are in a full recovery mode.”