SYDNEY--As talks to decide the fate of Leighton Holdings Ltd. on Wednesday ran past midnight, Germany's Hochtief AG came under pressure to bid for all of Australia's biggest construction company and end years of boardroom infighting.

Hochtief resisted, however, and the tactic worked. By dawn, the company had several big demands met in return for a sweetened offer of around 1.21 billion Australian dollars (US$1.09 billion) to increase its stake in Leighton from nearly 59% to 74%.

Gone were Leighton's senior management, with Hochtief's chief executive, Marcelino Fernandez Verdes, put in charge. The German company had also won the right to appoint the majority of directors to Leighton's board, conditional on support for the deal from minority shareholders and regulators.

"We pressed hard for a full takeover because we thought it resolved all the issues for everybody," said Leighton Chairman Bob Humphris. "While we pressed hard, we didn't press for very long because it became clear that wasn't a possibility."

Sydney-based Leighton has been grappling with long-standing issues such as an ill-timed move into the Middle East just before a construction downturn in 2008. More recently, it has been hurt by a sharp slowdown in mining investment in Australia as a long boom in resources fades. Leighton shares have fallen around 40% since the start of 2010, against an 11% rise in the wider Australian market.

Hochtief, controlled by Spanish builder Actividades de Construccion y Servicios SA, or ACS, said Thursday it would now offer A$22.50 a share for three of every eight shares held by Leighton's minority shareholders. That is up from A$22.15 a share earlier this week, and represents a 26% premium on the company's share price in the month leading up to the offer.

Leighton said Chief Executive Hamish Tyrwhitt and Chief Financial Officer Peter Gregg had left the company, as demanded by Hochtief. Mr. Tyrwhitt had worked for the company or its subsidiaries for nearly three decades, having started at its John Holland Construction business in his early 20s.

"I find it gut-wrenching," Mr. Humphris said. "I have been in tears today."

Hochtief took majority ownership of Leighton by buying up its stock in 2001, but relations with the board have often been tense. Mr. Humphris was appointed chairman last year after three members of its board quit because of differences with Hochtief. Leighton had also reshaped its board in August 2011, after its then chairman and chief executive departed within 24 hours of each other.

"It is no surprise Hochtief has looked to increase their stake and put its senior management in--everyone knew that was a highly probable outcome," said George Boubouras, Melbourne-based chief investment officer at Equity Trustees Ltd., which doesn't own Leighton stock. "But nevertheless the events of this week and how quickly it all played out was amazing."

By stopping short of a full takeover, Hochtief avoids triggering refinancing of debt through change-of-control provisions. The company is also eager to maintain a free float to support Leighton's listing on the Australian Securities Exchange, which could be looked on favorably by government entities awarding contracts.

Still, the increased board representation will give Hochtief more strategic control of the company, including a wide-ranging review under way that has the potential to deliver cost reductions.

Leighton, which is valued around A$7.5 billion and is the world's biggest contract miner, has been working to rebuild its balance sheet and bolster its flagging share price after problematic infrastructure projects in Australia led it in 2011 to report its first annual loss in decades. Its order book has been increasingly filled by deals to build projects from casinos in Macau to airports in the Middle East, as revenue from contracts to move earth at mine sites such Australia's vast iron-ore pits falls.

Analysts worried the latest reshuffle of top management could damage the business. "Given the importance of people and expertise in a construction business, this does risk eroding some of the franchise value of Leighton's businesses," Macquarie wrote in a research report.

Mr. Fernandez Verdes gave few hints about his plans for the group. "I need to know, I need to understand, I need to talk to my colleagues' before publicly disclosing any new strategy for Leighton, he said.

Write to Rhiannon Hoyle at rhiannon.hoyle@wsj.com

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