OAKLAND — Developers have proposed construction of a downtown Oakland office tower that would be the East Bay’s tallest building, a high-rise building with a dual-tower look offering a mix of offices and residences, executives said Friday.

The 34-story project — at 1261 Harrison St. near 13th Street — would consist of 120,000 square feet of offices, 185 residential units and 12,000 square feet of ground-floor retail.

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The project “will be a transformational live/work/shop/play mixed-use property in the fast-changing Downtown-City Center area,” said Fred Daven, a senior vice president for the project’s developer, San Jose-based realty firm Pinnacle RED, in a prepared statement. Pinnacle RED is a unit of Hengshan Corp., a company based in China.

Oakland city officials received the tower proposal Friday. The next tallest buildings in the East Bay don’t top 25 stories, including the 21-story 2100 Powell St. office tower in Emeryville, according to Edward Del Beccaro, a senior managing director with Transwestern, a commercial realty brokerage.

“There is demand for new office space in downtown Oakland, because the vacancy rate is quite low,” said Del Beccaro, who heads Transwestern’s Oakland, Walnut Creek and Silicon Valley operations. “You are seeing tenants crossing over to Oakland from San Francisco looking for office space, and that will continue.”

The other components should also be very much in demand, he predicted.

“You could build another 10,000 housing units in downtown Oakland and absorb them all,” Del Beccaro said. “The retail will do well because this is a hot retail district in Oakland.”

Located near the 12th Street and Broadway BART station, the developers believe they can tap into one of the most popular development features in the traffic-choked Bay Area: office and residential towers near mass transit.

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“This transit-oriented development just two blocks from BART will bring economic vitality to complement existing Chinatown and nearby businesses,” Daven said.

Developers hope the project could be a job generator. Upon completion, 1261 Harrison may have more than 400 office employees, nearly 100 onsite retail and property management workers, about 360 residents in the condominiums and hundreds of shoppers every day.

The ground-floor retail might be more than what one typically finds at the street level of a high rise.

“It all comes together at the ground level,” said Ronnie Turner, a development manager for Pinnacle RED. “The public market will have a mix of retailers, including some we expect from within downtown, drawing people in from 13th Street and flowing through the building to a unique pedestrian alleyway for relaxing, dining or events.”

The developers hope the tower’s ground-floor market will cater to what some call “locavores,” or people who seek to eat only foods that are sourced locally.

A locavore market hall with regionally sourced food and creative entrepreneurs will be the centerpiece of the ground-floor retail, the developers said in a prepared release.

And experts believe the housing will be badly needed.

“We have created so many jobs in the Bay Area, the housing is just not keeping up with the job creation,” Del Beccaro said. “And there is so little vacant land, you just have to go vertical.”

Hengshan, the parent company of Pinnacle, is also a realty developer and will bankroll the project.

“This project is going to be built,” Turner said. “Hengshan is going to provide the financing.”