Alvin Garcia noticed the hit immediately after San Francisco’s emergency declaration to prepare for a coronavirus outbreak.

His burger joint, Popsons, on Market Street next to the Golden Gate Theater, lost sales from older theater-goers. Business is now down 25%.

“We reduced staff,” Garcia said, sipping a coffee near his restaurant in an almost-empty cafe near closing time on Thursday. Jean Padilla, a barista at the cafe, Pentacle Coffee, said things were slower this week, especially in the mornings, with office workers in the area staying home and telecommuting.

As the community spread of the coronavirus outbreak grips the Bay Area — reducing travel, canceling events and emptying offices — San Francisco is reeling.

“This coronavirus is having a significant impact on our economy,” Mayor London Breed said at a news conference Thursday. Conference cancellations, lost hotel taxes and other impacts will bring a “significant reduction to our budget in the coming year,” she said, adding that safety is the city’s top priority.

In the city’s interconnected economy, canceled flights at San Francisco International Airport mean fewer hotel bookings, restaurant dinners and local purchases. Major companies are banning domestic business travel and implementing work-from-home policies, which means fewer commuters and less money spent downtown.

The city’s conventions, which draw thousands to the Moscone Center, have taken one of the most obvious blows. Participants at a slew of tech gatherings have pulled out, with seven events through May at Moscone nixed entirely, according to San Francisco Travel. Some 182,000 hotel rooms had been booked for those events, though not all have necessarily been canceled, and the associated spending in the city before the cancellations had been expected to total around $138 million, the agency said.

Kevin Carroll, president and CEO of the Hotel Council, which represents 85 hotels and two-thirds of the rooms in San Francisco, said cancellations have been “very significant” for the past month, but especially this week. It includes blocks of rooms for now-canceled business trips, conventions, tourist groups or airline crews.

“It’s a situation where it’s hitting on all fronts,” Carroll said.

That in turn has “a ripple effect” on small businesses, restaurants and taxis, he said. Loss of business directly impacts workers. Hotels, for example, often have flexible staffing, so if a big banquet is canceled, they don’t bring in the labor force, Carroll said.

Although city officials said it’s too soon to measure or predict the numbers, it doesn’t look good. Ted Egan, San Francisco chief economist, said the city will feel the spending shock associated with travel and tourism, especially if coronavirus cases mount. The Chronicle spoke to Egan shortly before the first coronavirus cases were reported in San Francisco on Thursday.

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Empty hotel rooms mean a loss of some of the city’s 14% hotel taxes, which accounted for more than $231 million of the city’s revenue this fiscal year — out of a $12.3 billion budget. The 8.5% sales tax pumped close to $112 million into the city’s coffers. And if San Francisco goes the way of other counties suspending community events, it could also miss out on around $326,000 in stadium admissions tax.

Transit agencies BART, Muni and CalTrain said it was too soon to calculate numbers on reduced ridership. But CalTrain spokesman Alex Eisenhart said it’s likely the agency could see an effect if events for which it provides special train service are ended.

SFO is losing thousands of dollars a day in landing fees from canceled flights to a growing number of international and domestic destinations (nearly 3% of all flights have been cut, the airport says). It calculates that it contributes several billion dollars in state and local tax revenues, through direct and indirect means (like workers spending their paychecks), and sends a $49 million yearly service payment to the city.

Businesses at SFO are hurting for lack of travelers. United, which accounts for 40% of the airport’s flight traffic, is reducing routes, freezing some hiring and salary raises, and offering voluntary unpaid leave to workers. Around 13,000 are based at its SFO hub.

As news about the coronavirus in California dominates national headlines, officials are pleading with the public to not shun the state. On Friday, Visit California President & CEO Caroline Beteta, said in a statement that the governor’s emergency declaration was a “proactive and quick response and commitment to preparedness.”

“Fortunately, there are no further travel implications, and visitors should feel safe and welcome to travel the state freely, maintaining the same standard precautions they would at home,” she said.

Chronicle staff writers Roland Li, Dominic Fracassa and Chase DiFeliciantonio contributed to this report.

Mallory Moench is a San Francisco Chronicle staff writer. Email: mallory.moench@sfchronicle.com Twitter:@mallorymoench