City developers are preparing world-class buildings to attract the most talented workers for companies both growing and moving here.

“The world is still coming to New York — it’s still the capital of the world,” says Cushman & Wakefield’s head of global brokerage, Bruce Mosler.

There are millions of square feet of new towers planned, built or still rising at the World Trade Center, the Hudson Yards area and Manhattan West, along with One Vanderbilt, 860 Washington St. and 61 Ninth Ave.

Plans for a revamped 787 Eleventh Ave. near the Hudson.Neoscape

Redevelopments include 425 Park Ave., 390 Madison Ave., 787 Eleventh Ave. and Pier 57, which will house Google offices. Boston Properties is also renovating 159 E. 53rd St. next to its 601 Lexington Ave., and will also reinvent 347 Madison Ave. Soon, Related will have 1.8 million square feet available at 1 Columbus Circle when Time Warner moves to its Hudson Yards.

There are additional redevelopments totaling more than 10 million square feet underway in Queens and Brooklyn, including: multiple Kushner buildings in Dumbo and Dumbo Heights; Tishman Speyer’s Gotham Center in Queens and its office addition to the Macy’s store at 422 Fulton St. in Brooklyn; and Rudin Management and Boston Properties’ new Dock 72 at the Brooklyn Navy Yard.

This means every single owner and developer is rolling out the red carpet to court and keep tenants signing on the dotted lines.

“I see continued underlying health on the office side and, as long as absorption stays at a good pace, clearly there’s capital coming in to New York,” says Adam Flatto, CEO of Georgetown Company.

Marty Burger.J Grassi/PMC

The firm is redeveloping 787 Eleventh Ave., which signed Pershing Square Capital but has a couple of floors still available.

One of the attractive things about the newer buildings is they’re being designed with higher-density offices. Marty Burger, CEO of Silverstein Properties, says the space per worker is shrinking.

“The densities are getting to be 175 [square feet] and even 125 square feet per employee, and only new buildings can accommodate that,” he says.

A building’s infrastructure must handle additional loads, or landlords will miss out.

“If you don’t embrace tech, you will be out of business in a very short time,” says Stephen Ross, chairman of Related Companies.

The interiors of 860 Washington St., which is ready for business along The High Line.Rendering

While new and redeveloped projects have an edge, all (of course) try to fill up.

“Landlords are reaching more to finalize transactions and doing what it takes to get the deal completed,” says David Emden, managing director of Newmark Grubb Knight Frank.

Newmark colleague Jared Horowitz, an executive managing director and leasing agent at Park Avenue Tower at 65 E. 55th St., says, “Owners are providing larger-than-normal concession packages or turnkey spaces.”

Richard LeFrak.Ralph Notaro / MEGA

President and managing director of Avison Young, A. Mitti Liebersohn, is representing Midtown’s 530 Fifth and Tower 45 among others. He says, “Since the election, we have been putting out leases — it’s been unbelievable.”

Leasing, however, is all about where younger workers want to be and what they want around them. “That’s why Midtown South was so booming, why Brooklyn is so in play and why the buildings in Midtown have to cater to them with amenities,” says Liebersohn.

At a fall NYU capital markets forum, Scott Rechler, CEO of RXR Realty, which has the Pier 57 project along with Youngwoo & Associates, said while it is important for companies to attract and retain talent, they also seek an attractive city when choosing spots to lease.

“New York has the diversity and character of neighborhoods [workers] want to live in,” he said. That’s another reason Ross is marketing mega-project Hudson Yards as a mixed-use neighborhood embracing a high-tech lifestyle.

Richard LeFrak, CEO of LeFrak, continues to develop the 600-acre Newport neighborhood that his late father, Sam LeFrak, began in New Jersey on the Hudson River. Located directly across from Battery Park City and Brookfield Place, the PATH provides connections all the way to Herald Square.

LeFrak, who can still construct millions more square feet in Newport, says, “If you have created a big enough core of activity, it makes it easier [to attract people].”

The warehouse-to-office conversion at 215 Moore St. in Williamsburg.Handout

The walk-to-work phenomenon is also occurring in Brooklyn as employers rent close to home in projects like Toby Moskovits’ redevelopment of 215 Moore St., known as the Brooklyn Generator.

“It’s a very cool project,” says Whitten Morris, head of Newmark’s new Brooklyn office. He adds that many companies relocating to Brooklyn are coming from Manhattan.

“The companies we rep are looking at everything and we are challenging them to look at everything,” says Peter Riguardi, president and CEO of the tri-state offices of JLL. “Sometimes they say, ‘We aren’t right for downtown.’ But they’re also looking at Brooklyn and Long Island City.”