Aaron Donald's Calabasas mansion sold faster than he can chase down a quarterback -- the NFL superstar parted ways with the pad for $6.258 million ... after just 2 WEEKS.
TMZ Sports has learned ... Donald -- who listed the six-bedroom, six-and-a-half-bathroom home for $6,250,000 on April 4 -- closed the deal on Monday ... and made some extra dough in the process.
The buyer will now enjoy a 7,036 square-foot home with a massive kitchen, infinity pool, game room, hoops court, outdoor party area and 4-car garage.
As we previously reported, the place -- listed with Jordan Cohen of RE/MAX -- also has a personal barbershop with a massive Donald painting on the wall ... but the room might get a makeover if the buyer is a Niners fan.
Of course, the timing of the sale comes amid rumors the 3-time Defensive Player of the Year could retire this season ... although Matthew Stafford previously told us he's trying like hell to get Donald to return in 2022.
On top of that, Rams head coach Sean McVay has said he expects Donald to be back ... so the move shouldn't have fans freaking out.