Dive summary:

• Architecture student Cătălin Sandu entered a contest sponsored by LifeEdited to design a New York City micro apartment – all 420 square feet of it – and devised something that is said to "live" like 700 square feet, thanks to a movable wall and other techniques.
• Sandu said part of the secret is to use smart design and technology to get as much multiple ujses as possible in the space.
• Helpful, Sandu said, were that the existing space had windows on two sides and had bathroom and kitchen plumbing close to each other.

From the interview:

"Despite the square footage, this was a complex project with a lot of detailing in all of its components." ...