The two sides issued a statement Monday saying that Gurlitt would cooperate with authorities to determine which of the pieces he's holding had been seized by Nazi forces. Gurlitt has agreed to return art that is linked to Nazi looting and will keep pieces that are not. A copy of the announcement was posted Monday on Gurlitt's official website.
A Henri Matisse painting in the collection already has become the subject of legal wrangling. Descendants of the French art dealer Paul Rosenberg have said they own the piece, which depicts a woman sitting in an armchair, but a rival claim has been filed, according to reports.
The task force that is researching the provenance of the artwork is aiming to complete its work in a year, according to the Monday announcement.