Real estate companies are betting that empty nesters will continue migrating to condominiums in Tokyo and other urban centers after selling suburban homes.

Some couples are tired of maintaining gardens, which can become a nuisance as homeowners age, while others find their homes too spacious after their children grow up and move away.

Developers are factoring in the future needs of their clients, such as ensuring that units boast such features as wheelchair accessibility, while creating appealing building designs.