Dive summary:

Japanese construction company Taisei has devised a technique that seals the top floors of a tower in plastic that lets men and machines work inside in any weather and without covering neighbors in dust.

As each floor is demolished, pieces are lowered to the ground by internal cranes that use the weight to generate electricity to power lights and some equipment.

The company, which has U.S. offices in Santa Clara and Cypress, Calif., calls it the "big hat" method because the building looks like it has a sort of hat around its top that jacks lower as the structure shrinks.

From the article:

Taisei is demoing its concrete-disappearing headgear right now at the Grand Prince Hotel Akasaka in Tokyo, which the company asserts is one of about 800 buildings in Japan taller than 100 meters that could benefit from the "big hat" treatment. ...