It may not have been a huge decline, but for many borrowers it represented an important milestone nonetheless: Average mortgage interest rates in recent days have again fallen under 6%. Now at an average of 5.99% for a 30-year mortgage (and 5.50% for a 15-year alternative loan term), rates here are still not what they were at the beginning of the decade. But they are in line with historic averages , and they're markedly improved from what they were just a few weeks ago after rates surged in