If you've been waiting for the housing market to present the right conditions to buy, this summer may be worth a closer look. Mortgage interest rates have dropped slightly from their spring levels, and buyers may find other advantages as well. According to Zillow , the average 30-year rate has come down from 6.62% on May 21 to 6.37% this week. That's still higher than the sub-6% rates buyers were seeing as recently as April 21. After a spring of rate swings driven by the war with Iran and