The top executive of JPMorgan authorized on a massive three billion pound office complex in London in the wake of assurances from UK government officials about pro-business policies.
The major US bank, which together with another major bank revealed major UK investments hours after being spared tax increases in the Treasury's financial statement, only gave final approval recently.
This approval was preceded by a meeting to New York by the prime minister's envoy, that met with the banking executive to provide assurances about the UK's economic approach.
The discussions happened days before the Treasury announced significant tax increases in a budget that exempted financial institutions from increased charges, after intense lobbying from the banking industry.
"The investment ... would likely not have proceeded if this budget had been perceived as against business interests."
On recently, JP Morgan revealed plans to construct a 3 million square foot headquarters in the docklands area, which will become its primary British base and host the majority of its 23,000 UK staff.
The financial institution highlighted that the project would be contingent upon "favorable economic conditions in the UK".
The bank has stated that the project could bring substantial economic value to the UK economy over the following six-year period.
The government official commented positively about the development, calling it a "massive endorsement in the UK economy".
A source familiar with the bank's investment strategy indicated that the decision to invest was "based on multiple factors" and that "no one could know whether financial institutions were going to be facing higher charges before the budget".
The JP Morgan chief stated that the "Treasury's emphasis of business expansion has been a significant element in helping us make this determination".
Goldman Sachs announced that it would enlarge its Birmingham office and recruit additional workers, in a initiative that would more than double its staffing levels in the England's major regional center.
The government had reviewed increasing the bank levy in the UK, as it considered approaches to generate funds after opting not to implement higher personal taxation, but ultimately decided against the measure.
Banking organizations in the UK are subject to a higher corporate tax level, which is higher than the typical percentage, as well as a separate levy on their domestic financial positions.
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