“Sure, these micro-apartments may be fantastic for young professionals in their 20's,” says Dak Kopec, director of design for human health at Boston Architectural College and author of Environmental Psychology for Design. “But they definitely can be unhealthy for older people , say in their 30’s and 40’s, who face different stress factors that can make tight living conditions a problem.”

Home is supposed to be a safe haven, and a resident with a demanding job may feel trapped in a claustrophobic apartment at night—forced to choose between the physical crowding of furniture and belongings in his unit, and social crowding, caused by other residents, in the building’s common spaces. Research, Kopec says, has shown that crowding-related stress can increase rates of domestic violence and substance abuse.

For all of us, daily life is a sequence of events, he explains. But most people don’t like adding extra steps to everyday tasks. Because micro-apartments are too small to hold basic furniture like a bed, table, and couch at the same time, residents must reconfigure their quarters throughout the day: folding down a Murphy bed, or hanging up a dining table on the wall. What might seem novel at the beginning ends up including a lot of little inconveniences, just to go to sleep or make breakfast before work. In this case, residents might eventually stop folding up their furniture every day and the space will start feeling even more constrained.

Susan Saegert, professor of environmental psychology at the CUNY Graduate Center and director of the Housing Environments Research Group, agrees that the micro-apartments will likely be a welcome choice for young New Yorkers who would probably otherwise share cramped space with friends. But she warns that tiny living conditions can be terrible for other residents—particularly if a couple or a parent and child squeeze into 300 square feet for the long term, no matter how well a unit is designed.

“I’ve studied children in crowded apartments and low-income housing a lot,” Saegert said, “and they can end up becoming withdrawn, and have trouble studying and concentrating.” In these situations, modern amenities—such as floor to ceiling windows, extra storage and a communal roof deck— won’t compensate for a fundamental lack of privacy in a child’s home every day.

She also doubts whether it’s a valid public goal to develop smaller units on city land. “In New York, property is just gold,” she points out. “Isn’t this something a developer could do in a [Brooklyn] neighborhood like DUMBO and make a lot of money?” By the same token, if micro-apartments are indeed the wave of the future, Saegert argues, they increase the “ground rent,” or dollar per square foot that a developer earns and comes to expect from his investment. So over time, New Yorkers may actually face more expensive housing, paying the same amount to rent a studio in the neighborhood where they used to be able to afford a one-bedroom. With the gradual erosion of zoning rules, the micro-apartment could very well become the unit of the future, the only viable choice for a large number of renters.