The chief executive of JPMorgan authorized on a substantial £3 billion office complex in the UK capital in the wake of guarantees from British authorities about supportive economic strategies.
The major US bank, that along with Goldman Sachs disclosed major UK investments hours after escaping additional levies in the Treasury's autumn budget, only gave final approval recently.
This decision followed a trip to New York by a top business adviser, who met with the banking executive to discuss commitments about the UK's economic approach.
The discussions happened shortly prior to the chancellor revealed revenue-raising measures in a financial statement that spared financial institutions from higher levies, following significant pressure from the financial sector.
"The investment ... would probably not have been announced if this budget had been perceived as against business interests."
On Thursday morning, JP Morgan revealed plans to construct a massive tower in the docklands area, which will serve as its main London office and house more than half of its 23,000 UK staff.
The company stressed that the investment would be contingent upon "favorable economic conditions in the UK".
The bank has projected that the project could contribute nearly ten billion pounds to the UK economy over the next six years.
The Treasury chief stated she was thrilled about the project, referring to it as a "significant demonstration of faith in the British economic prospects".
A source familiar with the development project indicated that the investment choice was "the result of comprehensive analysis" and that "no one could know whether banks were going to be subject to additional levies before the budget".
The banking executive commented that the "British authorities' focus of business expansion has been a key consideration in influencing our this choice".
A second financial institution revealed that it would increase its UK regional presence and hire 500 staff, in a move that would more than double its employee numbers in the England's major regional center.
The government had examined raising the financial sector tax in the UK, as it explored ways to raise revenues after rejecting higher personal taxation, but eventually determined to maintain current levels.
Banks in the UK currently pay a increased business taxation, which is higher than the normal rate, as well as a additional charge on their domestic financial positions.
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