Mark Zuckerberg’s former neighbors have an ax to grind with the developer who got the rights to their property and then extracted a payment from the Facebook Inc. founder to not to build a mansion overlooking his house.

If anyone deserved an extra $1.7 million from the 31-year- old billionaire, contend the former neighbors in Palo Alto, California, it was them.

As developer Mircea Voskerician pushes to go to trial over claims Zuckerberg reneged on a promise to introduce him to Silicon Valley’s tech elites as part of their deal for the land, he’s now accused of cheating the couple who owned the property. A judge may set a schedule for the Zuckerberg trial on Tuesday.

Moris Kori and Betty Frayman-Kori claim in a lawsuit that Voskerician secretly conspired with their real estate agent to acquire rights to their home and sell to Zuckerberg in 2012 -- even though they had been trying since the year before to get Zuckerberg to buy them out.

The Koris contend the fair market value of their property was significantly more than the $4.8 million they agreed to take from Voskerician. Saying they were duped, they want the developer to hand over the $1.7 million he collected from Zuckerberg to drop plans to build a 9,600-square-foot home with a view into the Facebook chief executive officer’s master bedroom.

No Deposit

The Koris claim that while they were in final negotiations with Voskerician, their agent at Alain Pinel Realtors Inc. prodded them to quickly sign a contract even though the developer hadn’t put down a deposit, giving him more time to negotiate behind the scenes with Zuckerberg.

The Koris said in their complaint that they agreed to their contract with Voskerician being passed along to what they were led to believe was an entity controlled by his development company. That entity, SFRP LLC, was actually owned by Zuckerberg, they said.

The couple alleges they didn’t learn Zuckerberg was the intended and ultimate buyer of their home until his lawyers told them in May 2014, the month that Zuckerberg was sued by Voskerician over the alleged broken promise to help him network with tech executives.

Voskerician “falsely represented his intent to purchase the property,” according to the complaint. “In reality, he never intended to perform and instead intended to market the contract” to Zuckerberg.

‘Sour Grapes’

Voskerician’s lawyer, David Draper, called the lawsuit “sour grapes.” He said the Koris weren’t able to close a deal with Zuckerberg because he initially wasn’t interested.

When the Koris signed a contract with Voskerician in 2012, they got $400,000 more than their asking price.

In 2013, a firm that handles Zuckerberg’s finances, Iconiq Capital LLC, snapped up three other properties surrounding his home, buying one for $10.5 million, another for $14 million and a third for $14.5 million, according to the Santa Clara County tax assessor’s office.

“The Koris bring this lawsuit because they are unhappy that they sold their property a year before the Zuckerbergs paid three of their old neighbors $38.5 million for the neighborhood,” Draper said in a phone interview. “We have documented evidence that shows that what they are saying about Mr. Voskerician is not true and they know it.”

Alain Pinel

Derk Brill, a real estate agent at Alain Pinel who represented the Koris and is named as a defendant in their lawsuit, didn’t respond to a phone call Monday seeking comment on it.

Zuckerberg’s lawyer, Patrick Gunn, didn’t immediately respond to an e-mail seeking comment on the Kori lawsuit.

Zuckerberg’s attorneys have said in court filings that the developer employed “extortive” tactics to profit from the billionaire’s desire for privacy. Zuckerberg has denied claims that he broke his word on introducing Voskerician to contacts in Silicon Valley.

The Koris’ case is Kori v. Alain Pinel Realtors Inc., 115cv279192, California Superior Court, Santa Clara County (San Jose). The Zuckerberg case is Voskerician v. Zuckerberg, 114CV264667, Superior Court of the California, County of Santa Clara (San Jose).