This is starting to be come the Year of the Apartment Building.

A prewar building at 737 Park Ave. is coming to market for the first time in 65 years and could fetch as much as $250 million.

The brick apartment building over a stone base on the northeast corner of 71st Street is opposite two of the city’s premiere co-ops, at 720 and 740 Park Ave.

But to get the pricing that the Katz family sellers insist on, this building, with units that average over 1,800 square feet, will have to become a condo conversion.

“This is a rare opportunity to acquire a gracious, prewar Park Avenue rental in the heart of the city’s most desirable neighborhood,” said Jon Caplan of Jones Lang LaSalle, who is leading the JLL marketing team that includes Richard Baxter, Ron Cohen and Scott Latham.

Designed by architect Sylvia Bien in 1940, the building has 108 units, of which five are ground-floor professional suites.

A 3,500 square foot penthouse is vacant. That unit, as well as several others, have terraces.

About 70 percent of the apartments are paying market rents, with the remainder rent stabilized.

The Katz family also owned 530 Park Ave., which the JLL Capital Markets team sold in 2007 while still with Cushman & Wakefield.

“This location has global cachet and it’s a real neighborhood,” said Caplan of his current offering that is close to private schools and Central Park. “There is lots of equity from all over the globe that wants to be in New York.”

Earlier this month we told you about another rental apartment building at 88 Leonard St. being offered by the current C&W team that we hear will also end up selling for around $250 million.

*

The most expensive deal in NoLIta was just completed for a mere 400 square foot store. Longtime UK celebrity art dealer, the Rebecca Hossack Art Gallery, will be forking over $400 a square foot for the petite shop at 262 Mott Street. Hossack, an Australian native, will be showcasing both her imported aboriginal works and slate of other artists.

Kim Skarvelis of Cast Iron Real Estate represented the tenant who wanted to be in a more eclectic spot than SoHo.

“The whole street is becoming more SoHo-like,” said Faith Consolo, chairman of Prudential Douglas Elliman’s retail group, who represented the ownership along with colleague Joseph Aquino.

Among those already sitting pretty on Mott Street are Ralph Lauren’s Double L, while as Crain’s reported, Jay Koos is moving down from Park Ave. to 292 Mott St.

*

Jon Epstein, Charles Kingsley and Jason Meister of Grubb & Ellis are finally officially marketing the former Williams Club at 24 E. 39th Street, which until last year had also been hosting the National Realty Club.

We told you it was on the market last October but paperwork got in the way of the actual offering.

Sources said the pricing will now likely be in the low-$20 millions for the six-story elevatored townhouse with about 25,000 square feet that will be delivered vacant. It’s expected to sell to a user such as a mission, non-profit or a foundation.

*

The Investcorp/Broadway Partners’ owned tower at 280 Park Ave. just completed two deals and has several other full tower floors under negotiation.

Gibraltar Private Bank & Trust signed a 10-year lease and will relocate from the 5,000 square foot 2nd floor to the entire 29th floor of 8,660 square feet at the very top of the building. Evan Margolin of Studley worked for the tenant.

The second tenant, Technology Crossover Ventures, aka TCV, is relocating and expanding to the entire 26th floor of 8,660 square feet from 750 Third Avenue.

The 10-year deal was negotiated for the tenant by Laurence Briody and Brian Hay of CB Richard Ellis.

The ownership was represented on both deals by the CBRE team of Peter Turchin, Paul Amrich, Sam Seiler and Gregg Rothkin.

*

Junior apparel company, Poof Clothing, will fill out 11,185 square feet of office and showroom space at 1407 Broadway that was previ ously occupied by Project Run way’s season fi nale.

Jack Terzi of Jack Terzi Real Es tate and Ralph Sitt of Sitt Leasing represented the tenant in the transaction, which had an asking rent of $42 per foot.

Michael Heaner and Grant Greenspan of the Kaufman Organization represented the ownership.