The world has taken notice of Downtown Los Angeles, which has become a magnet for developers and buyers in California and abroad. Korean Air is razing the former Wilshire Grand Hotel at Wilshire Boulevard and Figueroa Street to create a $1-billion skyscraper that will be the tallest building west of Chicago. No less than three Marriott hotel properties are rising around L.A. LIVE, the sports and entertainment district featuring world-class performers and cuisine.