3 Assembly Square is a prime waterfront office development, extending to a total of 65,765 sq ft over ground and five upper floors with undercroft car parking for 70 cars. - Benefiting from an impressive Grade A specification, 3 Assembly Square is a prime waterfront office development extending to a total of 65,765 sq ft over ground and five upper floors, with undercroft car parking for 70 cars. This high quality building, already home to ITV Wales, Life Science Hub, KPMG, Acuity Legal and Gambit Corporate Finance, benefits from a full height internal glazed atrium above the reception area as well as being awarded ‘BREEAM Excellence’ and an EPC 'B' rating.