Police Chief James Tasa said officers responded to a 911 call reporting a disturbance at the residence at 5:15 a.m. They found the man lying in the yard.
Tasa said firefighters and medical personnel arrived at the scene and confirmed that the man was dead.
The area was cordoned off, and an investigation into the cause of death is under way, the police chief said.
Tasa said the Police Department and the San Mateo County District Attorney's Office are investigating the death as suspicious. Anyone with information about the case is urged to call the Police Department at (650) 738-7314.