Donald Penn's got a new home in the NFL ... and now he's trying to get rid of his old home in L.A. ... 'cause the Washington Redskins lineman is selling his $5.2 million mansion!!
TMZ Sports has learned ... the 36-year-old Pro Bowl tackle is parting ways with his 8-bedroom, 11-bath Encino pad ... which comes with a private home theater and a freakin' walk-in shoe closet!!
If that ain't enough, the 11,000-square foot place also has a game room, private gym and a sauna ... as well as 2 private guest suites.