The FCA, will regulates financial markets in the U.K., is due to move into the property in east London in 2018.
The survey, which covered 1,000 City of London staff, also found that wealth managers and private bankers expect to receive an annual bonus worth on average £59,196 $87,000, amounting to about 60% of their salary.
Barclays is midway through a three-year cost-reduction plan, which involves shedding 19,000 jobs, or about 14 percent of its global workforce
The latest job losses will include staff from countries in which the bank's business is not a leading player, the sources said, speaking on condition of anonymity given the sensitivity of the subject.
They also include JP Morgan Chase, Nomura, Deutsche Bank, Bank of America Merrill Lynch and Morgan Stanley.