In New York, the proceeds would support de Blasio’s agenda, which includes 200,000 affordable-housing units, college scholarships, job training and reduced class sizes in schools, according to state Senator Brad Hoylman, a Manhattan Democrat and de Blasio ally who introduced the bill.

“It targets very wealthy non-New Yorkers who enjoy our services, don’t pay city income tax and pay very little property tax, particularly in buildings that got subsidies,” Hoylman said.

The city Finance Department reports about 89,000 co- operatives and condominiums owned by persons for whom the unit isn’t their primary residence. Of those, about 1,556, or 1.75 percent, would be affected by the luxury non-resident tax on units valued at more than $5 million, according to the Fiscal Policy Institute, the union-backed research group that developed the proposal.

One of those 89,000, Diane Francis of Toronto, who with her husband owns a part-time home on Manhattan’s Upper West Side, took to the pages of the New York Daily News to describe themselves as “walking wallets.” She wrote that they already pay plenty in property and sales taxes without using schools or other services she helps pay for.

No Thanks

“The money we spend, meantime, employs concierges, maintenance and cleaning personnel, masseuses, clothiers, hairdressers, tailors, cabbies, entertainers, vendors, museum curators, chefs, waiters, bartenders, comedians, singers, musicians, actors, artists, athletes and goodness knows who else,” she wrote. “And a new tax is the thanks we get?”

Steven Spinola, president of the real-estate board, whose 15,000 members include owners, builders, architects, brokers, bankers and lawyers, said in an e-mail the organization “will continue to communicate our serious concerns to the appropriate officials about the extraordinary chill in the sales and development market and the very negative impact this proposal would have on New York City’s economy.”

New York’s real-estate industry accounted for $15.4 billion of the city’s $41 billion in 2012 local revenue, more than enough to pay for its 70,000 teachers, 35,000 police officers, firefighters, sanitation workers, parks and libraries, according to a real estate board report.

Improbable Events

The industry’s reaction may be disproportionate to the tax’s chance of passage. For the idea to become city law, a lot of improbable political events would have to happen. The measure would require approval of the state legislature, whose composition will be determined in a Nov. 4 election and where the Senate, now run by a coalition of Republicans and Democrats, has been hostile to new taxes.