March 27 (Reuters) - Australia's Domain Holdings DHG.AX said on Thursday that U.S. online real estate firm CoStar CSGP.O has sweetened its proposal to buy the property classifieds firm, now valuing it at A$2.80 billion ($1.76 billion).
($1 = 1.5911 Australian dollars)
(Reporting by Shivangi Lahiri in Bengaluru; Editing by Vijay Kishore)
((Shivangi.Lahiri@thomsonreuters.com;))