Mitsubishi Estate Co. this year will start using a quarter of the ¥600 billion it plans to invest by 2014 to redevelop Tokyo's most expensive business district.

The company, the nation's second-largest developer, will invest ¥150 billion in the Marunouchi district and aims to reveal the details of the redevelopment project this business year, which ends in March, said President Hirotaka Sugiyama.

"Urban development is in our DNA," Sugiyama, 61, said in an interview in Tokyo.