The developer behind Tokyo's landmark Roppongi Hills is betting on another upscale project that has been more than 30 years in the making and will require a ¥580 billion investment.

Mori Building Co. unveiled Thursday the details of an urban redevelopment project that will feature a skyscraper expected to be Japan's tallest, on top of offices, shops, residences, a luxury hotel and an international school, and furnished with 24,000 square meters of greenery.

The contractor aims to use the as yet unnamed environment-focused complex, scheduled to open in the Toranomon-Azabudai area in 2023, to boost the capital's competitiveness as a major international city and make the living environment more friendly.