CB Richard Ellis Group Inc. said Tuesday that its lenders had agreed to modify $994 million in debt by extending maturity dates, swapping rounds of debt and taking other measures.

The Los Angeles commercial real estate services giant said it swapped $243 million of its $600 million revolving credit agreement into new tranches of debt expiring in June 2013, two years beyond the current expiration. About $201 million will be a new revolving facility and $42 million will convert to term debt.

The company said it also extended about $257 million of outstanding term debt by 18 months to June 2013, and about $297 million of term debt by two years to December 2015. In addition, $197 million of term debt amortization was extended to December 2013.

Chief Executive Brett White said the agreements are part of a broader strategy to boost its balance sheet, which has been battered by the downturn in the commercial real estate industry.

The changes “have greatly enhanced our financial position and helped ensure that we remain one of the industry’s best capitalized service providers,” said White in a statement.

Shares were up 25 cents, or 2 percent, to $11.93 in midday trading on the New York Stock Exchange.