Imagine this!

The storied Midtown building where John Lennon recorded “Imagine” and Bruce Springsteen made “Born to Run” has a new owner — Related Fund Management, a division of mighty Related Companies headed by Stephen M. Ross.

The fund snatched up 321 W. 44th St. on Monday for $152.5 million from Japan’s Unizo Holdings, which had paid $15 million more for it in 2015. The mostly-office property is one of three in Manhattan for which Unizo is widely said to have overpaid a few years ago and which the company is selling for losses.

The Related fund focuses on opportunistic investment rather than development. It had vied for the building with East End Capital, which was partnered with Unizo and had first refusal rights.

The building is known as The Plant — named for a former music studio where greats also including Jimi Hendrix and the Allman Brothers recorded smash hits. It didn’t fare poorly under Unizo — it’s 86 percent leased, a source said, with asking rents on remaining turnkey prebuilt spaces in the mid $50s per square foot.

But the major-league might of Related will likely lift it to a new level.

A Related spokesperson told The Post, “The building is located in a corridor of great growth and we are planning strategic enhancement to to appeal to smaller tenants.”

The 180,000 square-foot structure comprises three different addresses. Its 315 W. 44th St. portion is home to the latest incarnation of legendary jazz club Birdland, which moved there in 1996.

Lovers of Birdland, “The Jazz Corner of the World,” can relax. The club has 10 years to go on its lease, an insider said.

Also staying is the building’s defining exterior feature — a stack of colorful, retro signs and images on its east-facing facade.

The mural was painted by Brooklyn artists Patrick McNeil and Patrick Miller in 2013 to “pay homage to the building’s rich history as a creative engine” in the Times Square area, according to The Plant’s Web site. The word “Imagine” at the top refers to the Lennon classic.