Auction totals continue dropping but the number of lots sold go up

A loyal champion of British painters, he helped bring post-war American art to London

Dismay that council’s decision will stop Bold Tendencies building on its success in south London

Sotheby’s sale of Konrad Bernheimer’s family property, once looted by the Nazis, failed to meet expectations

Lehmann Maupin and White Cube will host joint exhibition in March

Also Known as Africa postponed to 2016 amid heightened security and a bleak economic outlook

Sonia Boyce to cre ate database of works by artists of African and Asian descent held in UK public collections

Saatchi gallery exhibition features 30 artists from the UK and Ukraine shortlisted for new competition

Ivor Braka and Thomas Dane hope gift will encourage greater support for culture in the regions

Murals by Vanessa Baird, who won the Lorck Shive prize last week, will be installed in Oslo government building

Chief executive Tad Smith hopes to keep “excellent, less-tenured” staff who want to change the worlds of art, jewellery, cars and wine

Vertigo Sea will debut at the Arnolfini in Bristol before touring to Margate and Manchester

John Martin and Everard Read galleries opened Circa London this week

First exhibition will include a rarely seen sketch by Michelangelo and miniature portraits selected by Peter Blake

Tests suggests pigment used in some of the paintings not commercially available before artist’s death in 1956

Art project that transformed Peckham car park faces uncertain future

Venue is the London dealer’s third in the UK capital

Austrian collector previously supported Frieze Projects with her prize

Proposal is one of three being considered by Southwark Council in south London next week

Christie’s to sell Margaret Thatcher’s belongings after V&A turns them down

Market turns on its head as buyers show less interest in the usual contemporary, blue-chip names

Performances from poetry readings to gospel singing will run 24/7 for the Chicago-artist’s first public art project in the UK

New banner works began as a performance, while artists plan to record 3,500 “fuckosophies” on vinyl

European Union climbs down over plans to ban cadmium paint pigment

Plea comes as Boris Johnson publishes guidance for councils, planners and developers on protecting arts venues

Most works, by emerging and established artists, are valued at less than $50,000