The estimated cost of one of Birmingham's largest regeneration schemes currently under development has shot up by half a billion pounds - with expectations that it could rise even further.
The Paradise project in Chamberlain Square started life as a £500 million scheme before its cost was revised up to £700 million a few years later.
Now, as work nears completion on the third office block there, it is heralded as £1.2 billion scheme,
A statement from the Paradise team said: "Due to the increase in design and construction costs, we now say Paradise is a £1.2 billion investment.
"The figure has always been subject to change and has risen from £500 million ten years ago in line with inflation and end values.
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"It will probably increase again by the time phase three is built (the area fronting Summer Row) and underlines the amount of investment required at today's prices.
"The two buildings currently under construction, One Centenary Way and Octagon, will add £160 million and £110 million respectively.
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"Add in the £120 million spent on infrastructure changes to the roads, basement and contribution to the tram extension, and the value soon rises."
Work already completed on Paradise includes a redrawn traffic route around the edge of the site and two office buildings - One and Two Chamberlain Square - whose tenants include financial services firm PwC and law firms DLA Piper and Knights.
Dining out venues Albert's Schloss, Dishoom and Rosa's Thai Cafe have also opened on the ground floor with more leisure venues still to come.
The third office block, called One Centenary Way, recently 'topped out' while the diggers are on site preparing the ground for Octagon, a 49-storey apartment tower containing 370 units to rent.
Other planned work includes more offices and a new 17-storey hotel.