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BUILDING EXTERIOR 55▲ 4.3 Yerba Buena Lofts, San Francisco, USA, Stanley Saitowitz Office/NatomaArchitects, 2002. Walls and slabs modulate the front façade.▲ 4.4 88 Wood Street, London, England, Richard RogersPartnership, 2000. Columns introduce rhythm and modulation atground floor level.▲ 4.5 RAC Control Centre, Bristol, England, Nicholas Grimshaw &Partners, 1995. Structural piers modulate the base perimeter.concealing it from the outside. The resulting double-height blind-colonnadethat visually functions as a base to the building, runs along the WoodStreet frontage until the skin moves further into the building to accommodatethe steps and ramp to the main entrance (Fig. 4.4). At pavementlevel, due to their size and modest spacing, the columns contribute astrong sense of rhythm. In the evening, when down-lit, the concrete