Last Friday afternoon the suspect told a Woodside homeowner he was there to inspect the backyard for landslide danger.
While he chatted with the homeowner police say a second suspect apparently entered the home and took jewelry.
The suspect is described as 5 foot 6 to 5 foot 9, heavy set with olive skin and a round, clean-shaven face with brown eyes.
He drives a silver or grey SUV. Police warn the man poses as a Caltrans worker to gain entry to the residences.