SHANGHAI, Nov 1 (Reuters) - Chinese homebuilder Yango Group (000671.SZ) offered on Monday to exchange some U.S. dollar bonds for new notes personally guaranteed by its chairman as it struggles to free up cash and avoid defaulting on upcoming debt payments. Yango"s liquidity crunch comes against the backdrop of a crisis at larger rival China Evergrande Group (3333.HK), which has stoked concern among investors globally about the country"s deeply indebted, $5 trillion property sector and tightened funding access for other developers. Yango is offering $25 in cash and $1,000 in new notes for each $1,000 of existing bonds exchanged, it said in a Hong Kong bourse filing. The exchange offer applies to its U.S. dollar notes due in February 2023, January 2022 and March 2022, which have an outstanding face value of $747 million. The new bonds are personally guaranteed by Lin Tengjiao, Yango"s founder and chairman, the filing said. The Hurun Global Real Estate Rich List of March 2020 had estimated Lin"s personal fortune at $2.4 billion. Yango said it is also seeking the support of investors to change the terms of its five other outstanding dollar bonds. It said the offer was part of "overall efforts to improve our liquidity, preserve options to stabilize our operations as a going concern, and avoid imminent payment defaults and potential holistic restructurings of our debts and business operations." Government policy tightening, credit events and deteriorating consumer sentiment had cut off refinancing avenues for property firms "and put enormous pressure on our short-term liquidity," Yango said. SHARES, BONDS SLUMP The announcement follows a report from financial information provider Redd on Friday that Yango had asked holders of its onshore asset-backed securities (ABS) to refrain from asking for repayment for a year over concerns it would struggle to pay this month. read more On Monday, Redd reported that Yango had sweetened its offer with plans to pay more than 10% upfront in cash, and a second instalment in March, with the remaining principal extended to November 2022. It did not say whether investors had accepted the offer. Yango"s shares in Shenzhen slid 7.5% on Monday and are down by nearly a quarter over the past week. The CSI300 real-estate sub-index (.CSI00952) slipped 1.6% on Monday against a 0.4% drop in the blue-chip index (.CSI300). In the onshore bond market, the Shenzhen Stock Exchange halted trading of Yango"s April and August 2024 yuan bonds , after they fell more than 30% on the day. "There is an ABS maturing on Nov. 8, so it"s a bit dangerous. The onshore market is anxious," said a Beijing-based portfolio manager who asked not to be named, as he was not authorised to speak with media. Domestic rating agency Dagong Global Credit Rating Co on Monday cut its outlook on Yango to negative due to uncertainty over the source of funds for debt repayments. However, it kept the ratings of the company and its onshore bonds unchanged at "AAA". Yango did not immediately respond to Reuters" request for comment. In international debt markets, Yango"s 7.5% February 2025 dollar bond fell more than 20% to a discount of about 85% of its face value, according to Duration Finance. Other Chinese developers" bonds also slumped, weighing on an Asian high-yield bond ETF (AHYG.SI), which fell more than 1%. Yango has eight outstanding U.S. dollar bonds worth a total $2.24 billion and 14 outstanding yuan-denominated bonds worth 13.1 billion yuan, according to Refinitiv data. Holders of the February 2023 notes, worth a total of $247 million, have the option to demand early repayment on Nov. 12. COLLATERAL DAMAGE Evergrande narrowly avoided a catastrophic default for the second time in a week on Friday, making a last-minute payment on an overdue dollar bond coupon just before its grace period expired. It shares (3333.HK) ended up nearly 4% on Monday. read more Evergrande"s woes have brought collateral damage, with some other Chinese developers forced into formal default on their dollar bonds last month and others proposing extended payment schedules. Xinyuan Real Estate Co (XIN.N) avoided a default on a maturing dollar bond in October by reaching an agreement with bondholders to exchange maturing notes for new bonds and cash. read more Ronshine China Holdings (3301.HK) on Monday became the latest Chinese homebuilder to be downgraded by a global ratings agency, as Fitch announced it had cut the company"s rating to "B" with a negative outlook, citing uncertainties over the refinancing of "significant" maturing debt. Chinese developers face maturities on bonds worth a total of $92.3 billion in the next year, according to Refinitiv data. Reporting by Andrew Galbraith; Editing by Muralikumar Anantharaman