(Bloomberg) — An annual report to shareholders from Tokyo Gas Co., expected this week, could be the first opportunity for Japan’s largest gas company to signal its plans for a sprawling, multi-billion dollar property portfolio that activist Elliott Investment Management estimates could be worth as much as 1.5 trillion yen ($9.7 billion).Most Read from BloombergNew York City’s ‘Living Breakwaters’ Brace for Stormier SeasIn Kansas City, a First-Ever Stadium Designed for Women’s Sports Takes the F