Sotheby’s has indeed now hired Eastdil Secured to market its iconic auction headquarters at 1334 York Ave., which could fetch around $500 million.

A new marketing teaser sent to prospective buyers explains the sale would include a short-term leaseback to enable the company to move to a new location. As I told you last week, Peter Riguardi of JLL is on the space hunt and concentrating in areas farther south than Sotheby’s current Upper East Side location.

The current flagship now takes up the entire block-front on the east side of York Avenue between East 71st and East 72nd streets on a plot of 40,457 square feet.

With 489,513 square feet, the 10-story, high-ceilinged glass and granite building was developed just for the auction house.

The Eastdil team is led by investment gurus Doug Harmon and Adam Spies. Expected buyers include hospitals, educational facilities, senior-care providers, hotels, retailers and residential redevelopers as the now-bulky structure can be taken down and replaced with a taller tower.

If Sotheby’s moves fast, a Nordstrom or Neiman Marcus could stake out a new spot and reap benefits from the eventual opening of the Second Avenue subway.

No comments all around. Stay tuned.

As market demand has changed over the years, office tenants have had a love/hate relationship with Third Avenue. This month, the love side is taking over. Two deals have just been signed at 685 Third Ave., a former Pfizer building that is now owned by pension funder TIAA-CREF.

Commonwealth Secretariat will leave 800 Second Ave. and NewOak Capital will leave 485 Lexington Ave. as they converge on full floors at 685 Third.

Based in London, the Commonwealth is an organization of 53 mostly small sovereign states that promote common principles and values. Its city mission office will move to 27,248 square feet on the 11th floor that had an asking rent in the $60s per square foot. The company was represented by Michael Burgio and Daniel Organ of Cushman & Wakefield.

NewOak will have the entire 21st floor of 17,800 square feet, which had an asking rent of $77 per square foot. Larry Zuckerman and Dan Gronich of Newmark Grubb Knight Frank represented the tenant. The company works on minimizing clients’ risk.

Matt Astrachan, Frank Doyle, Clark Finney, Jonathan Fanuzzi and Dan Santagata of JLL represent the building for TIAA-CREF. The largest tenant, Salesforce, has signed a lease for the top floors at 1095 Sixth Ave., but it is unclear whether its now-below-market spot at 485 Third Ave. will be retained or subleased or whether the keys will be handed back.

The downtown-based law firm Fried, Frank, Harris, Shriver & Jacobson has renewed its Midtown conference center lease of 11,703 square feet on the 36th and 37th floors of 375 Park Ave. Each floor has four conference rooms.

Lawyers Jonathan Mechanic and Meyer Last represented their firm in the negotiations with building owner RFR, which was represented in-house by AJ Camhi and a JLL leasing team led by Matt Astrachan. Asking rents in the building are a sky-high $170 to $180 a square foot.

JLL’s May tech report notes tech-company leasing was down in April. But as we’ve said, there’s a lot going on between the bricks. JLL disclosed that five tech tenants are seeking 100,000 square feet or more. These include First Data, Pivotal Labs and Samsung, each trolling for 100,000 square feet. Zocdoc is examining spaces of 150,000 square feet. Then there is “gobble-up” Google, which wants another 250,000 square feet.

Luxury perfumery By Kilian has signed a 746-square-foot lease at 944 Madison Ave. and East 74th Street.

Beth Rosen and Benjamin Zack of RKF represented By Kilian, which also opened a store in the Meatpacking District last year.

The CBRE team of Richard Hodos, Daniel Alesandro and Joseph Hudson represented the building owner, which has redeveloped the property with luxury stores and condos.

By Kilian was founded in 2007 by cognac heir Kilian Hennessy. Its keepsake packaging is sold in 40 countries. The company was sold to Estée Lauder earlier this year.

Real Estate Board of New York’s spring retail report has asking rents on Madison from East 57nd to East 72nd streets at $1,600 a square foot, but this block by the Met Breuer would be less.