Arquitectonica’s Las Vegas gamble is finally paying off big with two new projects on the Strip. The Miami-based firm’s $3 billion, 2,998-room Cosmopolitan Resort & Casino is currently under construction on Las Vegas Boulevard, next to the Bellagio. Developed by New York City-based Ian Bruce Eichner, it calls for two, 600-foot-tall twisting blue glass towers perched atop a four-level, 100-foot-tall podium. These 52-story, prism-shaped high-rises are wrapped in fretted balconies; they will contain hotel and condo-hotel units managed by Grand Hyatt. A glass-clad low-rise structure will contain 265,000 square feet of shops and restaurants topped by a five-acre sandy beach and pool.