A Stormont fund to aid disadvantaged communities in Northern Ireland didn't operate transparently, according to a report by the Auditor General.
The Social Investment Fund, administered by the Executive Office, allocated millions of pounds to disadvantaged areas in the region.
It has awarded £79 million to 68 projects across Northern Ireland since it was set up in 2012.
The money was initially intended to be spent in the three years to March 2015, but many projects have been delayed and the SIF delivery period has been extended to 2019-20.
The budget for the fund has been increased by more than £13 million.
A report by Auditor General Kieran Donnelly found the scheme did not operate transparently.
The report found that the Executive Office does not hold a clear audit trail in relation to the awarding of public money from the fund.
It identifies a number of serious concerns in the initial stages of the scheme, including conflicts of interest which it found were not always appropriately dealt with.
The report also found that documentation around project selection and prioritisation was poor.
The report, published on Thursday, highlighted one of the projects, an SIF-funded redevelopment of a derelict site on Bryson Street in east Belfast, which is now costing the public purse in rent.
The fund provided £1 million, with the site owner, charity Landmark East, contributing £200,000.
The GPs who operate from the site entered into a 25-year lease with Landmark East, at an annual rental of £90,000. The Health and Social Care Board has agreed to fund the annual lease costs.
The report found the project does "not represent value for money".
"The public purse has paid £1 million to construct an asset which it is now also renting at a cost of £90,000 per annum. This equates to a total cost of £2.25 million over the life of the lease. In our view, this does not represent value for money," the report said.
However the report acknowledges that once projects became established, governance improved.
It concludes by urging that lessons are learned and improvements made when similar public spending schemes are developed.
The report makes seven recommendations including the Executive Office holding a clear audit trail, "to justify why decisions were made and demonstrate that assessment processes have been applied fairly, consistently and transparently".
Mr Donnelly said the findings over the governance of the scheme are "very concerning".
"The importance of good administration and ensuring conflicts of interest are adequately handled should be well understood in the public sector," he said.
"But in the case of SIF, the guidance produced by the department was inadequate, there was little evidence that procedures were followed, and a number of conflicts weren't declared. This is very concerning.
"Evidence from my audit work across the public sector suggests there is a role for additional expertise to support good governance and maintain high standards.
"Whilst audit plays a valuable role in identifying lessons to be learnt once schemes are operational, issues of propriety and conflicts of interest must be fully and properly explored when schemes such as SIF are being designed."
A spokesman for The Executive Office said the department accepts all the recommendations in the report.