Demolition of existing buildings at 326-332 High Holborn & 26 Southampton Buildings (Holborn Gate), 319-325 High Holborn (Heron House) and 44 Southampton Buildings and construction of a new building comprising of two basement levels, ground, plus nine upper storeys (65.8m AOD), including a mezzanine at upper ground level and external plant space at roof level, consisting of office floorspace (Class E(g)(i)) on ground and upper levels, retail/food and beverage floorspace (Use Class E(a)-(b)) at ground level and flexible cultural/exhibition/performance/learning/ community or creative affordable workspace (Use Classes F1(a)-(e)/ F2(b)/ E(g)(i)/ sui generis) floorspace at ground and basement levels. Creation of public realm, including new hard and soft landscaping, external terraces, provision of new servicing facilities and associated access from Southampton Buildings, cycle parking and other associated works.