77 Gracechurch Street, EC3 5th: New Cat B fit out 5,939 sq ft 4th: New Cat A 4,347 sq ft 2nd: Being fitted t to new Cat B 77 Gracechurch Street is a prominent contemporary office building, with a distinctive curved façade and a newly remodelled double height entrance hall.The 2nd floor is being newly fitted to a high quality Category B finish, with furniture and cabling.