Las Vegas (AP) — Gambling giant Harrah’s Entertainment Inc. announced a USD 1 billion expansion Thursday for its flagship Caesars Palace hotel-casino in a bid to compete with a wave of new megaresorts planned for the Las Vegas Strip. The company plans to build a 665-room tower called Octavius, three pool villas for high rollers, add an extra 263,000 square feet of convention space and upgrade 512 of its oldest rooms.