The Golden State Warriors want to add a hotel and condos next to the Chase Center basketball arena under construction in San Francisco’s Mission Bay.

The basketball team plans to propose a 142-room hotel and up to 25 upper-floor condos at the northeast corner of the 11-acre project site, near the intersection of South Street and Terry A. Francois Boulevard.

The hotel requires approval from the city’s Office of Community Investment and Infrastructure, which oversees new Mission Bay projects, and other city approvals. If approved, the team hopes to start construction by mid-2021 and open in 2023.

Rick Welts, president of the Warriors, said neighboring businesses and residents have expressed a need for a hotel, especially for visitors to the UCSF Medical Center at Mission Bay. A 250-room Marriott hotel at Third and Channel streets is under construction, and Welts said it would complement the Warriors’ hotel. There’s also demand for housing and little supply, he said.

“We do see a need for lodging in the Mission Bay area. We look forward to learning more about the Warriors’ proposal,” Barbara French, a UCSF vice chancellor, said in a statement.

The hotel would be branded as a 1 Hotel, operated by SH Hotels & Resorts, an affiliate of Starwood Capital Group. Other 1 Hotels are in New York and Miami Beach. Design for the hotel has not been finalized, and an architect has not been selected, Welts said. The Warriors are seeking to build up to the Mission Bay area’s height limit of 160 feet.

The Chase Center project, set to open in the fall, includes an 18,000-seat arena, 100,000 square feet of retail and restaurant space, and 580,000 square feet of office space to be occupied by Uber. The hotel would replace a smaller 24,000-square-foot retail building that is already approved, but it would include a similar amount of retail and restaurant space.

With no taxpayer subsidies, offices and retail uses were needed to make the more than $1.5 billion Chase Center project financially viable, Welts said.

“If you look at all the new arena and stadium projects across the country, this is a formula that makes it possible,” he said.

Welts said the hotel may help lessen traffic — already a hurdle for the area — as guests can walk to basketball games or other events at the arena. It will also help enliven the area on non-game days, when concerts and other events are planned, he said.

“The goal is to activate use of the site every day of the year,” he said. “Three-quarters of the events that take place there will not be Warriors events.”

Other Bay Area teams are increasing their roles as real estate players. The San Francisco Giants and developer Tishman Speyer plan to start construction this year on new housing, parks and office buildings at Mission Rock, currently a parking lot for nearby Oracle Park. The Oakland A’s have proposed a new waterfront stadium plan that includes shops and restaurants.

“Privately financed arenas have to be integrated with other things in order to make financial sense,” said Roger Noll, a Stanford University economics professor emeritus and expert on stadiums.

“It’s much more likely that there will be synergies with the arena and other things if they’re built together,” Noll said of the Warriors’ plan. “I think it’s a good bet.”

Corinne Woods, chair of the Mission Bay Citizen Advisory Committee, which represents local residents, said the group hasn’t taken a position on the hotel.

Woods opposes building a hotel more than 90 feet tall, because of the site’s proximity to water and possible shadows on Bayfront Park.

Roland Li is a Chronicle staff writer. Email: roland.li@sfchronicle.com Twitter: @rolandlisf