** Shares of building materials maker Boral Ltd BLD.AX
rise as much as 3.6% to A$6.060, highest level since Feb. 9
** BLD among top 10 gainers in the ASX 200 benchmark index
.AXJO
** BLD gets an A$6.05 per-share offer from top shareholder
Seven Group Holdings SVW.AX to buy 28.4% stake in BLD it does
not already own
** Offer implies valuation of A$1.90 bln ($1.24 bln) for
28.4% stake in BLD; values co at A$6.67 bln
** BLD currently trading at A$6.00, just shy of the offer
value
** BLD establishes an independent board committee to review
offer
** SVW shares down as much as 2.8% to A$39.630 in their
biggest intraday drop since Jan. 17
($1 = 1.5309 Australian dollars)
(Reporting by Sameer Manekar in Bengaluru)
((Sameer.Manekar@thomsonreuters.com; Twitter: https://twitter.com/sameer_manekar))