An L.A. mansion owned by former NBA player Earl Watson was robbed Monday night by at least 4 men in ski masks -- who handcuffed the occupants and ransacked the place.
While 35-year-old Watson owns the $4 million Encino home, he currently rents it out to a local elderly couple.
Officials say the men -- at least one of whom had a gun -- broke in through a back door and once inside, they handcuffed the couple and stole various items ... including cash.
Law enforcement sources tell us a maid was in the house -- who hid and called 911.
So far no arrests have been made -- and cops are investigating.
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