The project, named 14 Hills, will open on the 14th floor of the 120 Fenchurch Street skyscraper development this November.
Piat will create a series of modern British menus for the site, ranging from breakfasts to business lunches, brunches, Sunday roasts and dishes for a fast-serve deli counter.
It marks a return to London for the chef, who joined Bar Boulud when it opened in 2010, but left in 2018 to join Jòia par Helene Darroze in Paris.
14 Hills will be D&D’s largest opening in London since the launch of 10,000 sq ft Aster in Victoria in 2017, and will occupy a c.9,200 sq ft site in the City skyscraper beneath a public roof garden.
D&D says the dining room will have “spectacular views of the London skyline” with a design “inspired by English terraces…with a canopy of evergreen plants and seasonal climbers growing at its centre”.
The company owns and operates over 30 restaurants worldwide, including Le Pont de la Tour, Bluebird and Angler in London.
It recently opened its third New York restaurant. D&D CEO Des Gunewardena told BigHospitality last year that a badly managed Brexit could see the company shift its growth overseas.