"We believe the new owner is a graphic artist from Levin. We don't know what the plans are for the gallery space but we're glad it will still have an artistic purpose."
Originally built as a house in 1912, the building was once the Putiki Store. Before the Shepherds bought it, it was home and studio to world-renowned glass artist Kathryn Wightman.
A number of Whanganui's most innovative mixed-media artists have been part of The Red Door Gallery co-operative.
Artist Julie Coffey said she had thoroughly enjoyed being part of the Red Door family.
"It has been a fabulous life of showcasing marvellous and varied art," Julie said.
"I've loved this part of my art journey with a grand and talented bunch of artists, and will be sad to leave, but who knows what might come next for all of us along the art and creative pathway."