The full details of West Ham United's deal as tenants of the Olympic Stadium should be made public, according to former Leyton Orient chairman Barry Hearn.
West Ham are to play their final season at Upton Park before moving to the converted 54,000-seater Olympic Stadium in the 2016-17 campaign.
Last week it was revealed the cost of converting the Olympic Stadium into West Ham's new home has risen to £272 million, rocketing the overall cost of the project to £701m.
The Hammers are to pay a contribution of some £15m, but their annual rent, reported to be £2.5m on a 99-year lease, has not been revealed.
Hearn, who was chairman of Leyton Orient for almost 20 years before leaving in 2014, failed in his attempts to groundshare the Olympic Stadium with West Ham.
"Who is it confidential from? I can't see any reason whatsoever why it should be secret," Hearn told BBC Sport.
"The actual deal West Ham has got is still confidential and our current mayor of London is refusing to reveal details.
"As a taxpayer, I find that quite confusing. When people spend my money, I rather like to know what it's been spent on.
"In the absence of that information we can only speculate that it is a deal so beneficial to West Ham that it becomes questionable in its own right."
Newham Council contributed £40m, the Government £25m and UK Athletics £1m. There was £38.7m from the Games Public Sector Funding Package and £3.5m from the London Marathon Charitable Trust.