Lakewood Ranch, Florida -- It's a unique housing development where one of the selling points is keeping grandma or grandpa even closer than right next door.

Construction is just getting underway, so we went to find out what's behind this possible community of the future in Manatee County.

The U.S. Census Bureau says 51 million Americans are living with three generations or more under one roof.

How do you handle that? Build a "mother-in-law" suite? Add a garage apartment? Or check out what this new neighborhood in Lakewood Ranch is trying.

Wednesday is the official groundbreaking for Bridgewater at Lakewood Ranch, but they've already started on a handful of houses. And several of them will have something extra -- a whole second house!

"Whether you're caring for an elderly parent or you have family members moving back in because of loss of job, or divorce, or whatever the situation might be -- it does allow families live under the same roof but still have their own privacy," said Matt Devereaux with builder Lennar Homes.

Lennar calls it "NextGen" -- put a full four-bedroom, 2 1/2 bath home right up against another one with its own bedroom, bathroom, kitchen, living room, and even one car garage.

The floor plans have names like "Independence" and "Liberation." They'll have two front doors, but they'll share a front porch, a roof, and likely several generations of the same family.

"I think for some who might have a child who is going to attend a local university or a local college, it makes more sense to keep them home as opposed to paying room and board or paying for an apartment," Devereaux said.

"For somebody who doesn't want to send a parent to a nursing home, they can keep them close, but still have a little bit of separation."

A NextGen home starts at $399,000 for 3,800 square feet. But even if you don't live in a brand new house, living in a multigenerational home can save you money.

It's not just on the obvious things like like child care or nursing home costs, but studies show just by pooling groceries and cable, multigenerational homes tend to come out ahead financially over the rest.

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