OAKLAND — Downtown Oakland will gain a new office tower as an adjacent historic building gets a major face lift, executives with a joint venture that bought the development site said Monday.

The University of California’s Office of the President is expected to be a tenant in the office project planned for the city’s urban core at the 1100 Broadway site, where the historic Key System Building is located.

“This is a very significant deal for Oakland,” said James Ellis, managing principal with Ellis Partners, a realty firm that is a partner in the development venture for 1100 Broadway. Ellis said his firm is looking forward to be able to “transform such an important block in the middle of downtown.”

A long-term lease has been signed for 130,000 square feet in the lower floors of the new building.

A person familiar with the transaction said the University of California Office of the President, which has occupied space in downtown Oakland for a considerable time, is the initial tenant in the 1100 Broadway project.

The University of California Office of the President didn’t return phone calls and emails seeking comment.

The property, at the corner of Broadway and 11th Street, consists of a vacant lot and a century-old office building that once was the headquarters of the old Key System, a web of trains and buses that connected the East Bay and San Francisco.

The developers intend to build a new 320,000-square-foot Class A office tower on the site. They also plan a major refurbishment for the Key System Building, which was built in 1911 and is 34,000 square feet.

Ellis Partners has teamed up with Intercontinental Real Estate in the joint venture to redevelop the site.

“We have been evaluating opportunities for ground-up development in this market for some time and look forward to finding other ways to participate in the vibrant Bay Area economy,” said Jessica Levin, Intercontinental’s senior director of acquisitions.

SKS Partners is the site’s previous owner, having purchased the parcel in 2008. But the financial crisis and Great Recession forced numerous developers nationwide to scuttle their plans, and the site has been dormant for nearly a decade since SKS acquired the property.

“We look forward to delivering a newly designed, state-of-the-art office tower that reflects Oakland’s unique spirit,” Ellis said.

The plans for the new project arrive at the same time that Uber Technologies has sharply scaled back its plans to occupy space in downtown Oakland’s Uptown Station building. Initially, Uber had planned to move 2,000 to 3,000 staffers to the complex, which would be operated as a co-headquarters with its principal offices in San Francisco. Now, Uber, the owner of the building, will primarily be a landlord for the project. Uber will staff Uptown Station with hundreds of employees and seek tenants for what it won’t occupy.

Despite those shifts by Uber, Ellis believes the 1100 Broadway project will prosper. It’s scheduled to break ground by the end of this year or early 2018 and be available for tenants during 2019.

Ellis noted that downtown Oakland has relatively low vacancy rates and a lack of new office construction.

“We will pursue all types of tenants, but certainly, the design of the building and the amenities will be attractive to tech tenants,” Ellis said.