More proof trendy Greenwich Village is the hottest real estate market in New York City:

Here's a first look at a building that could end up as the most expensive single family residences ever purchased in all of Manhattan, at $100 million dollars.

Read MoreNYC total property value surges over $1 trillion, setting a record

The owner, identified only as a private equity manager, is waiting approval from the Landmarks Preservation Commission to significantly expand the existing 15,000 square foot property located at 27 Christopher Street.

Real estate broker Dolly Lenz had the exclusive listing.

Lenz told CNBC's "Power Lunch" on Wednesday the "mega mansion" is a game changer for the area.

"It's gorgeous, it has a 50 foot lap pool, 4,000 square feet of outdoor space, multiple terraces, sprawling indoor living areas across five levels and grand entertaining areas."

Lenz sold the property to the current owner last year at the standing record price of $45 million on a $17 million appraised value by re-positioning it as a single family home instead of a commercial building.

Read MoreSecret lives of the super-rich

"There was a fierce three-way bidding war between the now-owner, a private equity manager, and two hedge fund managers," said Lenz. "Now he owns prized piece of Manhattan that will be worth $100 million."