U2 frontman Bono is amassing an impressive street art collection. His acquisitions to date, purchased for a cumulative €62,000 ($84,400), could soon escalate in value, according to the Irish Independent.

The rock star is just one of the many celebrities that London’s Opera Gallery in Mayfair counts among its clientele. Madonna, Lily Allen, Gordon Ramsay, designers Stefano Gabbana and Domenico Dolce, and Arnold Schwarzenegger, have all been known to purchase art at the gallery from dealer Jean-David Malat.

In an interview with the Independent, Malat claimed that Bono likes to stop by the gallery as part of a “day out with his family,” and his wife, Ali. The singer, who is a big fan of British artist Joe Black, “definitely has an incredible eye for good works of art,” and pays “real attention to detail.”

“When he sees something he likes he stops and looks very carefully at it,” Malat continued. “He’s a very smart man and understands what makes good art.”

Black in particular has seen a surge in popularity since Bono began collecting his work. Works by the artist that sold for a mere €2,500 ($3,400) four years ago are now routinely fetching upwards of €62,000 ($84,400).

Malat declined to give a number of how many artworks by Black Bono has bought over the years, but admitted it is “a lot.”