As with the C&SLR, the high cost of property in the City, coupled with the presence of the Royal Exchange, the Bank of England, and Mansion House, meant that the station had to be built entirely underground.
Ligesom for C&SLR betød den høje ejendomspris i City og tilstedeværelsen af Royal Exchange, Bank of England og Mansion House, at stationen måtte bygges udelukkende underjordisk.