Long Island City has become Prime investment property, thanks to Amazon.

The already popular waterfront Queens neighborhood was named as the future home of Amazon’s Gotham headquarters last month — and buyers have been on a feeding frenzy ever since, local brokers told The Post.

Demand has been so great since Amazon’s announcement Nov. 13 that one broker says he’s been working around the clock, seven days a week, leading dozens of mostly Chinese prospective investors on neighborhood tours in rented minivans.

“It’s just more efficient,” said Patrick Smith, of Stribling & Associates. “We start the tours showing one-bedroom apartments. Some people get off when that part of the tour ends, and more investors jump on to look at two- and three-bedroom apartments.

“Amazon is the best thing that could happen to Long Island City.”

One buyer was so fearful of missing out on the hype that he closed on an $800,000 unit the same day he viewed it.

“I feel lucky to have gotten in when I did,” said the eager buyer, who asked not to be identified.

Other investors are following suit: Last month saw 30 percent more residential sales in the area compared with November 2017.

Meanwhile, the number of signed contracts in the neighborhood has nearly doubled since the summer, with 29 in November vs. 16 in August. And because not every developer publishes their data in real time, if at all, that number almost certainly represents only a fraction of the actual sales.

“The uptick in interest and the sudden shift from a buyer’s to a seller’s market is very real in the wake of Amazon’s announcement,” said Garrett Derderian, Stribling’s director of data and reporting.

Those investors who grabbed a piece of the local market ahead of the announcement, unaware that Amazon — and a price hike — was coming, made out best of all, pulling off the real estate equivalent of striking oil.

Among the lucky ones were Dr. Gary Hirshfield and his wife.

“We looked in Williamsburg and the Upper East Side but loved this more,” said Hirshfield, who, along with his wife, also a doctor, bought a pricey, 1,600-square-foot penthouse across the street from the MoMA PS1 art museum just ahead of the announcement. “And that was before the Amazon news hit.”

In the wake of the announcement, the developer of that property jacked up the prices of all remaining units — a trend that has extended to 19 area listings, or 9 percent of the local stock, since Nov. 13.

The hike is even more striking because nearly all of the listings in Long Island City had recorded steady price declines before the announcement, following the trend of nabes in Brooklyn and Manhattan “oversaturated” with inventory, Derderian said.

The most substantial price increases were in new developments, such as Arcadia 27 on 27th Street, Corte on 44th Drive, The Bond on 11th Street and The Craftsmen Complex on 45th Road.

And some buildings — such as the 802-unit Skyline Tower, the first Queens building with a projected sellout of $1 billion — have yet to even hit the market.

“Every day I get emails from projects and brokers offering 20 percent discounts in Brooklyn and Manhattan,” Smith said. “We are the only New York City market that is a full-fledged seller’s market.”

Additional reporting by Aaron Feis