Most of New York’s fancy real estate towers have an army of spokespeople tasked with promoting them to prospective buyers.

Now 520 Park Ave. — developed by Zeckendorf and designed by Robert A.M. Stern — will have an expert in-house.

Public relations bigwig Ronn Torossian is in contract to buy a full-floor home at the 62-story luxury address, sources tell The Post.

The final price that Torossian — founder of firm 5WPR, whose clients include Coca-Cola, Microsoft and Anheuser-Busch — will shell out isn’t yet available since the sale hasn’t closed. But a 4,613-square-foot, full-floor dwelling is listed for $20.5 million, StreetEasy shows.

Meanwhile, another — measuring 4,628 square feet on a higher floor — is asking $31.65 million.

Torossian would neither confirm the deal nor comment for this story. Representatives for the building, located at East 60th Street, didn’t return messages seeking comment. Gennady Perepada of One & Only Realty, who we hear represented Torossian, declined to comment.

Torossian’s deal is the latest to emerge from the 33-unit, limestone-clad building, which has largely stayed out of the spotlight while under construction.

Last August, billionaire Frank Fertitta — who sold mixed martial arts company Ultimate Fighting Championship to an investment group for $4 billion in 2016 — was identified as the buyer of a $70 million penthouse.

Last September, The Post outed two more buyers.

One soon-to-be resident is James Dyson, the billionaire founder of the eponymous appliance brand, who’s getting a duplex penthouse in the $73 million to $83 million range.

Former Barclays CEO Bob Diamond, meanwhile, will live in a simplex in the $20 to $40 million range.

Building amenities include a garden located off the lobby, a two-level health club and a lap pool located beneath a vaulted ceiling.