My client won the house, competing with 3 other buyers. The seller was so happy. The offer was:”as is”, no contingencies, 3 weeks free rent back, great price, all that for the luxury to own home in Sunnyvale. My client shopped around for the best loan. First he was going with a mortgage broker who promised him the best 30 year fixed conforming loan he could get. Then he found a B of A lender who was willing to get him 5 year arm for 5% (with 1 point). What a deal! The mortgage broker could not match that rate and my client was going to do the loan with B of A. 2 days later the original mortgage broker found a 30 year fixed  for 5.25% with a 1 point buy down. They locked that rate which disappeared that afternoon. The B of A lender could not match that loan and the buyer, being a conservative borrower preferred the 30 year fixed.

A diligent broker has to be on top of things, check the rates a few times a day and be in touch with many lenders.