Wow. A PI. Did the PI use binoculars? Did he look into the windows from afar? Or, did he rappel down the side of the building to collect info?
Nice detail. "lives in California." Is that the coast, valley or mountains? NoCal, Central, or SoCal?
If the PI watched Gene in "California" during February, March and April, the reason he saw Gene doing nothing all day would be because Gene wasn't even in the state!!