Real estate sources tell us ... the 25,000 sq. ft. home wasn't big enough for their enormous art collection that features pieces by Jean-Michel Basquiat, Andy Warhol, Ernie Barnes, Keith Haring and many other artists.
The Englewood, NJ home is filled with such a massive collection, Swizz calls it "Eight Acres of Showtime."
The couple bought the house back in 2013 from Eddie Murphy. It's pretty awesome ... the sprawling home boasts 8 bedrooms, a movie theater, indoor pool, 2 lane bowling alley, recording studio and, of course, a gym. Listing price: $14.9 million.
As for their next move ... they've figured out a way to get enough wall space ... Alicia and Swizz are building from the ground up.