Brisbane Lord Mayor Graham Quirk has demanded an apology from the Labor Party after the Crime and Corruption Commission (CCC) said they would not investigate the proposed sale of land to a Liberal National Party donor.

Earlier this month, the ABC revealed Brisbane City Council approved the sale of public land to businessman Boon Tan without going to tender.

The deal was submitted to the State Government for final approval but was vetoed.

In a media release, the CCC said it had assessed the deal and found no reason to pursue the matter further.

Councillor Quirk labelled the saga as a smear campaign and demanded an apology from Labor's Rod Harding.

"So today's CCC clearance makes it absolutely clear that the claims that have been put on the table by Mr Harding and the Labor Party in this election campaign have no substance," he said.

"The Labor Party in this Brisbane City Council election have done nothing but spread innuendo and smear in relation to myself and other members of my team.

"What we've seen are some preposterous claims by the Labor Party; Rod Harding has made some claims about my conduct.

"Today I am calling on Rod Harding to do the right thing and apologise, apologise for the claims that he's made in relation to my conduct over the last period of time.

Boon Tan's proposed land sale has been cleared by the CCC.

"I'm also asking him to apologise to the people of Brisbane around those claims."

But Mr Harding has refused to apologise and said the land deal should have been disclosed at the time.

"I've been calling on Graham Quirk to be more transparent in his dealings," he said.

"He should not be doing secret deals with land donors without telling people.

"No-one knew he was doing this deal so he should tell people."

The CCC made a point of how it had recently highlighted how certain practices in local government "may give rise to perceptions or allegations of corruption".

"The CCC continues to remind public officials and elected officials of the importance of transparency and accountability," the statement read.

"The CCC encourages the Government to take steps to require decisions-makers to demonstrate clearly that all decisions are equitable, transparent and represent value for money."

The statement said the allegations could have been avoided by "open and transparent declarations of all known interests in or related to a matter for decision".

"This includes the declaration of any known political donations, whether or not the declaration is required by law," the statement read.