SAN JOSE — Santana Row’s owners are planning a huge new apartment complex that would add hundreds of residential units to the iconic mixed-use development.

The 300-unit apartment project would be located on the east side of Santana Row and rise five stories, according to plans submitted to San Jose city planners.

The new development would be located at 358 Hatton St. A site plan shows it is known as Lot 12 at Santana Row. At present, Lot 12 is being used for surface parking.

If approved, the new apartments would join an increasingly busy Santana Row project that attracts visitors from well outside the immediate area.

The development contains the 215-room Hotel Valencia, more than 70 shops, 20 restaurants and nine spa salons. Santana Row also has 834 residential units, of which 219 are privately owned condos and 615 are apartments for rent, according to a brochure circulated in 2016.

Santana Row has 300,000 square feet of existing offices, including 65,000 square feet at 300 Santana Row and 235,000 square feet at 500 Santana Row. Plus, Federal Realty is building a 260,000-square-foot office complex along with 30,000 square feet of retail at the 700 Santana Row site.

The existing offices at 500 Santana Row have attracted tenants such as tech firm Splunk. No tenants have been disclosed for the under-construction 700 Santana Row development.

The project’s developer also wants to develop more offices and other facilities as part of the Santana Row West development across Winchester Boulevard on the site of now-closed movie theaters.

Federal Realty executives weren’t immediately available for a comment.

However, in a previous interview with this news organization, Jeffrey Berkes, president West Coast for Federal Realty, said the residential units at Santana Row are popular.

“People like to live here,” Berkes said. “If they don’t want to be car-dependent on nights and weekends, they don’t have to be.”

The prospect of new homes, even if they aren’t below market rates, was welcomed by Carl Guardino, president of the Silicon Valley Leadership Group.

“While the Leadership Group always prefers housing development includes at least some affordable components, we recognize our housing crisis requires homes at all income levels,” Guardino said. “If all the new Santana Row residences are market rate, there is an incredible need for those homes as well.”