As the appreciation of street art rises (as do its prices), attribution becomes critical

New York is a city with the space and the traction to make introducing a fair of Art Basel's scale a lucrative prospect. So why are locals dragging their feet?

Although Iranian art heavyweights made their reservations about the show clear, it will go on to tour North America

The show revolves around the family of Silvio Berthoud, who was Giacometti's nephew

Building, staff and some artists on the way out

Public art for private gain?

Allegations of “fake” antiques further undermine confidence

The works had been illegally exported or excavated

The United States artists fund fills the vacuum created after the government suspended the National Endowment for the Arts in the '90s

The modernisation of this landmark is an example of Knoedler's adaptability, as one of the US's longest established commercial galleries

More new work from the first photographer to win the Turner Prize

The exhibition illustrates how monarchical patronage in the 15th century paved the way for an age of artistic accomplishment in Iran

Silly season in New York brings mobsters out on the town, gay-makeovers for the men of America and 80s disco to Kenny Schacter’s new gallery

The artist's late works show her escaping the Abstract Expressionists and creating a world of her own

His mythic heads and forms appear in paintings and drawings (1935-42) on show in New York

There have been no prosecutions, but some cases remain in litigation

Nancy Shaver's painted sculpture at Feature Inc. and James Castle's "Structures" at Knoedler & Co.

C&M Arts, Gagosian Gallery, and Paul Kasmin all jump on the bandwagon

What's next for galleries in the Chelsea and Soho areas?

The foundation has licensed Warhol imagery for around 13 years

How apocalyptic crises in the twentieth century - the endgame - permeated the familiar and the practical

A Rothko double-header at PaceWildenstein and Washburn, Lichtenstein’s brushstrokes legacy at Mitchell-Innes & Nash while Gagosian installs “Brushstroke” at the Seagram building Plaza

The dispute revolves around the work 'Improvisation No.10'

Just as social observers are deploring the hectic roster of arts fairs, three new events have been added to the already crowded calendar.

Bonnard, Vuillard, Denis and Roussel are assessed as distinct individuals, brought together by the shared conviction that “There are no paintings, just decoration”

Also on show are Mark di Suvero’s massive sculptures at Gagosian, and Charles Simond’s unfired clay at the Joseph Helman Gallery

Art on the agenda at St Etienne, Powers’ Pop pics at Gagosian and all-American art at Adelson

Drawing on draughtsmanship at Alexander and Bonin, Paula Cooper, Zwirner and Marlborough

Gagosian christens his Chelsea space with Serra sculptures, plus cutting-edge holiday gift ideas