The focus on outer borough purchases and development took hold last year as Brooklyn and Queens became desirable alternatives to Manhattan with apartment seekers ready to pay more to live there.

“People are leaving Manhattan proper because they can’t afford condo prices or simply because they want to live in the other boroughs,” said Michael Weiser, president of GFI Realty Services.

Simon Shkury, President of Ariel Property Advisors.

That steady stream of renters and condo buyers is following the buying and development surge that is capitalizing on finding cheaper land and underserved neighborhoods, developing new projects and then selling out and moving on to new ventures.

Already, early developers are cashing out after renting up their projects.

The 84-unit newly constructed luxury rental building The Bergen, at 316 Bergen St. in Boerum Hill, was sold by its developer Miki Naftali’s Naftali Group for $52.2 million to a private European investor through a Savills Studley team.

Last year, GFI sold its own apartment building at 1125 Banner Ave. in Sheepshead Bay for $39.5 million.

On behalf of third parties, GFI sold a four-building portfolio in Bay Ridge and Midwood for a record-setting $60.3 million.

Ariel Property Advisors sold a 17-building, 676-unit portfolio in the Bronx for $85 million. Sylvester Zawadzki

In the Bronx, Shimon Shkury, president of Ariel Property Advisors, and the firm’s vice presidents, Victor Sozio and Michael Tortorici, closed a 17-building portfolio and one vacant lot for $85 million to a group that will keep it affordable. The buildings are in the Morrisania area.

Ariel’s stats show Bronx sales jumped 60 percent last year, to more than $1.37 billion, with multifamily trades accounting for 80 percent of the action.

With the Kingsbridge Armory turning into the National Ice Center and a redevelopment of a former Post Office by Youngwoo & Associates yet to be revealed, the Bronx is on everyone’s radar.

Michael Tortorici, a vice president at Ariel Property Advisors.

“Heading into 2015 the market is strong and we expect it to carry over, said Tortorici.

In Queens, Long Island City and Astoria are getting “to the next level” with Elmhurst and Ridgewood next. “We hear investors, renters and condo buyers looking for value and good quality of life and the outer boroughs are where they find that,” said Tortorici.

Crown Heights is starting to see rental development and Tortorici feels that it, along with Prospect Lefferts Gardens, will become some of the new frontiers in Brooklyn. “You also have the de Blasio administration promoting initiatives in East New York,” he said. “A pipeline of new development throughout the Outer Boroughs coupled with a now rapidly growing economy bodes well.”

Added Eric Anton, senior managing director, HFF, “The Bronx is great and more institutional investment and more residential investment will come.”