The contemporary art venue occupies 6,500sqm of gallery space and can hold up to 1,500 guests for a reception.
It is managed by agency GSP, which has also been responsible for some of the capital's most high-profile events.
"The Saatchi Gallery has a striking contemporary feel, perfect for sleek and minimal designs," said Simply Flowers managing director Nic Clarke.
"We have already worked at the gallery and look forward to going back in the near future," she added.
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