The first groundbreaking at Plano's $3 billion Legacy West project was back in 2014 when the 250-acre project kicked off. Since then, there's been a steady stream of construction starts. On Thursday, work began on what will be the tallest tower in Plano. The $100 million, 29-story LVL29 apartment high-rise is being built next door to Liberty Mutual Insurance's high-rise campus in Legacy West. The 328-unit, modernistic tower will sit just west of the Dallas North Tollway between Liberty Mutual and JPMorgan Chase's new office complex, which is just south of State Highway 121. The luxury tower has been in the works for more than a year. "Reaching the groundbreaking is a big milestone," said Luke Harry, project manager with NE Development. "We are excited to make our mark on Plano and Legacy West." The apartment tower will be one of the tallest buildings outside the downtown Dallas area. Legacy West developer Fehmi Karahan said that when he started developing in Legacy business park 19 years ago, the tallest building in the area was the Electronic Data System headquarters, which has about eight floors. "This is going to be an iconic building," Karahan said at the groundbreaking. "A development of this size and magnitude takes a lot of courage." The nearby Legacy West Urban Village, with shops, apartments and a luxury hotel, will open in June. "Thirty-eight months after the groundbreaking for Legacy West, to be able to see all this took a lot of coordination," Karahan said. Plano Mayor Harry LaRosiliere has been to a lot of groundbreakings in Legacy West during the last few years. Offices for Toyota, Liberty Mutual and Chase will all open later this year. "I call this the year of the big bang," LaRosiliere said. "This area of Legacy West is the center of the universe. "There's nothing else going on like Legacy West."