The project would include the creation of a 200-hectare park, sports and recreation facilities and other commercial areas.

Many of the 2004 venues have been underused or virtually abandoned in the decade since the games, and further neglected in recent years after the country slumped into financial crisis.

The government has struggled to attract investors to its troubled privatisation programme, a criticism often made by bailout lenders that are pressing for high taxes to remain until public finances further improve.

Finance Minister Yannis Stournaras said on Wednesday that an unpopular austerity tax, known as the solidarity surcharge, would be extended for "as long as needed" to keep the budget deficit within limits set by recue creditors. The levy was due to end next year, but Stournaras told private Skai radio it would be imposed until budget improvements become "permanent and sustainable".

Protests, meanwhile, continued against a new austerity deal reached this month between Greece and lenders from euro-zone countries and the International Monetary Fund.

Pharmacies around most of the country closed in protest at new licensing rules. In central Athens, riot police forcibly removed protesting cleaning staff affected by recent state job cuts from inside the Finance Ministry.