** Shares of Australia's Maas Group MGH.AX slide 23.2% to A$4.30, on track for their worst session ever
** Stock at its lowest since November 24
** Real estate firm says it would sell construction materials division to Heidelberg Materials Australia (HMA) for up to A$1.70 billion ($1.18 billion)
** Co says certain freehold land will be retained by it and leased to HMA under long-term commercial lease arrangements
** The transaction represents a valuation premium to MGH's current trading multiple and above comparable transactions in the construction materials sector, co adds
** Around 4.5 mln shares change hands, nearly 9.2x 30-day average
** MGH down 21.1% YTD
($1 = 1.4351 Australian dollars)
(Reporting by Keshav Singh Chundawat in Bengaluru)
((Keshav.singhchundawat@thomsonreuters.com))