Bruun Rasmussen, Copenhagen, Jørn Utzon Collection, 9-11 June

Collection of politically inspired works by artists from the Congo on the market

Luxury boutiques are chasing out the galleries from their Paris addresses

Doyle, New York, Belle Epoque: 19th- and 20th-century Decorative Arts, 3 June

Increasing pressure to grow is pushing mid-tier galleries to find new ways to remain competitive

This year’s edition offers a more logical layout and a green Messeplatz project

Van Ham, Cologne, Asian Art, 6 June

Property tycoon Aby Rosen, promoting his new Manhattan skyscraper, talks about art-world fatigue and giving something back to society

Retired stockbroker began buying in 1967

How experts make sure that everything at Masterpiece is authentic and that the fair lives up to its name, using everything <br> from connoisseurship to scientific techniques and sensory tests—and what happens when they smell a rat<br>

Scott Burton left his estate to the New York museum—but prices for his work have tumbled

Almost $2.5bn was spent on art in just six evening auctions last month, as the market is pushed to new levels for trophy works

And what can be done in the face of the country’s crippling political and economic crisis

Gagosian Gallery and six Hollywood execs in months of negotiations to use images of Superman, Iron Man and Spiderman <br>

In addition to two portraits of Jacqueline Picasso, more than 60 other works are believed to have gone missing from a storage facility in Paris suburb

Paddle8 moves to new premises in Mayfair

Olivier Thomas is released from police custody, while Yves Bouvier denies all allegations

Football club owner has built large collection, with more than 150 Modern British works on public display

Three lawsuits allege that a storage facility company, a subsidiary of Christie’s, failed to take proper precautions, despite urgent warnings