HONG KONG (Reuters) - Highly leveraged property firm China Evergrande Group 3333.HK is in talks with financial institutions to raise about $1.5 billion this month by offering its Hong Kong office tower as collateral, two sources with direct knowledge of the matter said.

An exterior view of China Evergrande Centre in Hong Kong, China March 26, 2018. Picture taken March 26, 2018. REUTERS/Bobby Yip/File Photo

The fund-raising plan by China’s No.2 developer by sale underscores the pressure the developer is under, as China’s property sector slows and Beijing’s capital controls have restricted its ability to pay offshore debt, which stood at $16.4 billion as of the end of June.

Evergrande bought the office tower in Wan Chai, a bustling business district by day and red-light district by night on Hong Kong island, for HK$12.5 billion ($1.6 billion) in 2015 from Chinese Estates Holdings 0127.HK.

Evergrande, which has yet to fully settle the transaction, plans to use the capital raised from refinancing the tower partly to pay back offshore debt and make dividend payments, one of the sources said.

Evergrande did not respond to requests for comment. The sources requested anonymity because the talks were private.

While the practice of raising money by offering property as collateral is not uncommon among highly leveraged Chinese developers, it is unusual to securitize a building that has yet to be fully paid off, a property market expert said.

Evergrande had agreed to pay off the tower in installments to Chinese Estates within six years of the sale.

“Evergrande is trying to... extract additional liquidity,” said one of the sources, who has direct knowledge of the fund-raising plan.

Helped by record profit and a boom in China’s property market, Evergrande cut its net gearing ratio to 127 percent at end-June from 184 percent at the end of 2017, while total borrowings dropped as much as 8 percent during the period.

The developer aims to further cut the ratio to about 70 percent by June 2020 by repaying high-interest debts and curbing land purchases.

But there are rising concerns for the property sector’s ability to deleverage, with developers expecting a slowdown after two years of government measures aimed at cooling the red-hot sector.

Shares of Evergrande, which has a market value of $31 billion, were up 2.7 percent as of 0240 GMT on Monday. They have plunged 26 percent so far this year, lagging a roughly 14 percent fall in the benchmark Hang Seng Index .HSI.