SAN JOSE — The developers of the Coleman Highline project, bolstered by their ice breaker lease with fast-rising tech firm 8×8, have swiftly begun to lay plans for an expansion of the San Jose office complex on the southwest edge of the city’s international airport.

Accompanying the plans to expand the San Jose office complex is a recent parcel purchase that gives project developer Hunter Properties complete control of the site.

“We are getting some serious looks from potential tenants for more buildings at Coleman Highline,” said Deke Hunter, president of Hunter Properties.

In January, 8×8, a cloud communications and software company, leased 162,000 square feet of offices for its headquarters. That was the first lease of a building in the development.

Two office buildings now exist on the site, both located on the southeast end of the development near Avaya Stadium, including the one leased to 8×8. Coleman Highline developers are seeking approval from San Jose planners to build out another 775,000 square feet of offices, enabling the project to expand in a northwesterly direction.

“We are hoping to get building permits by the end of June,” said Curtis Leigh, a principal executive with Hunter Properties.

On March 15, acting through an affiliate called CAP Tranche 2, Hunter Properties paid the City of San Jose nearly $34 million for about 27 acres Coleman Avenue.

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All told, Coleman Highline could accommodate 1.5 million square feet of office development along with ground-floor retail. The first two existing buildings total roughly 357,000 square feet, including the one that 8×8 will occupy.

The developers are convinced one or more tenants could be poised to strike leasing deals in the project, which at full buildout would consist of eight office buildings.

“We are seeing a lot of activity beyond the first building, tenants that want 300,000 to 500,000 square feet,” Leigh said.

The interest in Coleman Highline reflects a general upswing in San Jose’s attractiveness to tech companies, said Mark Ritchie, president of brokerage Ritchie Commercial.

“What Coleman Highline is seeing is kind of the Google effect, along with the expansions by a lot of technology companies,” Ritchie said. “You have Google looking to expand in downtown San Jose, but you also have all the pressure from the growth in Cupertino, Sunnyvale and Mountain View, as well as Santa Clara.”

Facebook, Google, Apple, and Amazon all have struck deals for huge expansions in Sunnyvale, either through leases or property purchases, or both. Mountain View is seeing major growth by Google and LinkedIn. Menlo Park is seeing huge expansions by Facebook. Apple has opened its vast Apple Park complex in Cupertino and has obtained enough land and buildings in north San Jose to develop an 85-acre campus.

Near the Diridon train station in downtown San Jose, Google has proposed a mixed-use, transit-oriented community of 6 million to 8 million square feet of offices, retail and residential developments, and the search titan could employ 15,000 to 20,000 people in offices that would be integrated with local neighborhoods.

Adobe Systems intends to expand its downtown San Jose headquarters campus of three high rises by building a fourth office tower on a lot adjacent to its existing complex.

One big selling point for Coleman Highline, the developers assert: Tenants could deem the site to be transit friendly.

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“We market Coleman Highline as walkable to the Santa Clara Caltrain station for sure,” Leigh said. “There are not that many sites this size that are that close to a train station.”