Mayor-elect Bill de Blasio, who has laid out a plan to raise taxes on the wealthiest New Yorkers, tapped a company where many of them work to find his newest top-level appointee.

On Monday, Mr. de Blasio announced that Alicia Glen, an executive of the Goldman Sachs investment banking firm and a former city official, will be the deputy mayor for housing and economic development. Goldman is known for having some of the highest-paid executives in corporate America and for paying its bankers and traders more than they would earn at other Wall Street firms.

Mr. de Blasio and Ms. Glen said at a news conference in a Brooklyn factory that, as deputy mayor, she would focus on building more affordable housing and helping connect low-income residents to jobs that pay enough to support their families. Mr. de Blasio said his administration would demand “living-wage jobs” from companies that receive tax breaks and other subsidies from the city — a requirement that Mayor Michael R. Bloomberg staunchly opposed. Referring to the central theme of Mr. de Blasio’s campaign, Ms. Glen said, “The tale of two cities is not O.K.” Ms. Glen said she did not think her co-workers at Goldman would object to paying higher taxes so that Mr. de Blasio could fulfill his promise of providing universal prekindergarten to the city’s children.

Ms. Glen, 47, said that, being a banker, she calculated that the proposed tax increase would amount to only about $1,000 a year to those who make $750,000 or more annually. That increase, she said, breaks down to approximately $3.50 a day, or the cost of one latte.