The Government is paying £1.1 million a year to rent empty office blocks in the centre of Birmingham.
Chamberlain House and 77 Paradise Circus have been vacant since January when the Government Office for the West Midlands moved out.
But rent, rates and service charges amounting to £1,155,758 are still being paid.
The GOWM, which retains leases on Chamberlain House until February 2006 and on 77 Paradise Circus until December 2014, faces a potential bill of £6.6 million if new tenants are not found.
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Accommodation costs for the GOWM have soared since the organisation moved in January to plush new offices at 5 St Philip's Place, off Colmore Row, where annual rent and rates cost £2.1 million.
The figures were obtained by Birmingham Yardley MP John Hemming through a Freedom of Information Act inquiry.
Mr Hemming (Lib Dem) described the payment of rent and rates on empty buildings as a "wicked" waste of taxpayers' money.
He added: "The new offices are larger and cost £32 per square foot, which is far more than the GOWM was paying for its previous accommodation. Their total costs have risen by £1 million.
"I am amazed at the profligate way in which the GOWM handle public money. They seem entirely happy to pay twice as much in rent as they used to, while continuing to pay costs of £1.1 million for offices kept empty."
The cost of renting 5 St Philip's Place works out at £5,000 per head for each of the GOWM's 400 employees.
Mr Hemming said: "The question has to be asked why the Government Office needed to move into some of the most expensive accommodation in Birmingham city centre. Money is clearly no problem for the Government."
The MP said it would have been better if the GOWM had moved to Fort Dunlop, by the M6 at Bromford, where new office accommodation is available at £12 per square foot.
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He added: "It is a question of accountability. They are wasting public money and they are not being held to account.
"I have gained considerable experience over the years of how money is wasted in local government, but I have to say that central government is in a league of is own when it comes to squandering cash."
A GOWM spokeswoman defended the move to 5 St Philip's Place. The GOWM had " outgrown" Chamberlain House and 77 Paradise Circus and a move to larger premises was the only realistic option.
"We are actively seeking to re-let both buildings," the spokeswoman added.
The move was approved by Ministers. It would have been impossible to move to Fort Dunlop since building work is still taking place.