Stonnington Council has blocked the release of a secret report that would reveal to hundreds of inner suburban home owners and businesses whether the city is planning to buy their properties to turn them into parks.

The document contains a list of up to 450 sites in South Yarra, Toorak, Armadale, Glen Iris, Prahran and Malvern that have been selected under a controversial new 20-year planning strategy.

Less than a dozen affected land owners have so far been officially notified by the council that their properties have been identified as "strategic opportunities" for transformation into parks and open spaces.

But The Sunday Age's bid to have the full list publicly released under freedom of information laws has been denied by the council on the grounds of protecting the "personal privacy" of the land owners.

"The denied material comprises the addresses of third parties. In making this decision I have taken into account, among other things…the possible cause for anxiety disclosure may cause," Stonnington's FOI officer wrote.