The ACT government has paid $4.2 million for a block of land behind the casino at Glebe Park, where it plans to build a new stormwater pond, replacing the pond in the middle of a roundabout on Parkes Way.

The block includes land sought by Aquis in its redevelopment of Casino Canberra, which the government might now on-sell to the casino.

An artist's impression of the Casino Canberra rebuild connecting with a proposed wetlands in Glebe Park.

The land was sold to the government by Glebe Park Pty Ltd whose sole shareholder is Canberran Paul Green and whose business address is Amalgamated Property Group. But Mr Green said neither he nor Glebe Park Pty Ltd were the beneficiaries of the sale, but simply the trustee. He would not disclose the members of the trust.

"If they [trust members] wanted the public to know who they were they would have put a different structure in place," he said.