** Shares of Keystone Realtors KEYS.NS rise 7% to 655.5 rupees, their biggest intraday pct. gain since Aug. 2023
** Real-estate developer gets contract for redeveloping GTB Nagar in Mumbai, a major urban renewal project, in partnership with Maharashtra Housing and Area Development Authority
** Project has estimated gross development value of 45.21 billion rupees ($528.20 million)
** More than 130,000 shares traded, nearly 3x the 30-day average
** Session's gain trims YTD losses to 2.8%
($1 = 85.5925 Indian rupees)
(Reporting by Aleef Jahan in Bengaluru)
((aleefjahan.cs@thomsonreuters.com))