Joshua Leahy, 30, was arrested minutes after a witness saw him walking on his neighbor's property at 151 Stanford Way around 7:50 a.m., Sgt. Thomas Georges said.
The witness said he saw a suspicious person take an item from his neighbor's porch and leave the area, Georges said.
Based on the witness's description of the suspect, Leahy was found near 100 Ebbtide Ave. Police recovered a collapsible camping tent and arrested Leahy for prowling and possession of stolen property.
He was booked into the Marin County jail under $10,000 bail.
Georges said the arrest illustrates how observant citizens can help apprehend criminal suspects by calling 911 or the police department's business line at (415) 289-4170.