Anyway, it’s still shuttered, so good luck with that plan.
Find one that's willing to have a Spirit Halloween store in it and you might find them more receptive.
In Germany, I note that thousands of small businesses flourish that vanished from London’s streets - I have a choice of places to have a kitchen knife sharpened, for example - and while London holds vast opportunity, I fear that its breadth is severely constricted and whole areas of industry, skills and expertise are effectively extinct as the startup Capex is too high, and the Opex is vampiric.
And it's hard to counter-act in high-density areas; without deliberate action everything becomes McDonalds or financial businesses.