On August 7, 2006, Christie's auction house announced it was handling the sale of the remaining four works by Klimt that were recovered by Maria Altmann and her co-heirs after their long legal battle against Austria (see Republic of Austria v. Altmann). The portrait of Adele Bloch-Bauer II was sold at auction in November 2006 for $88 million, the third-highest priced piece of art at auction at the time. The Apple Tree I (ca. 1912) sold for $33 million, Birch Forest (1903) sold for $40.3 million, and Houses in Unterach on Lake Atter (1916) sold for $31 million. Collectively, the five restituted paintings netted more than $327 million. An unremarkable Attersee painting fetched $40.4 million at Sotheby's in November 2011.