may be less demanding, suggesting a different finish,provided the combination is aesthetically pleasing orhas a logical separation.Walls for top floor(s)The architect should balance the shape and size requirementsfor the top floor panels with a reasonableutilization of molds being used on the rest of the project.The top floor is not the place to use excessivelylarge units unless the design and budget warrant theadditional crane cost. Figure 2.1.3 illustrates the useof units that are narrower in width than those of thelower floors.The project in Fig. 2.1.4 shows an application ofsome of the major points made in this chapter. Thecenter bay of the building contains stairs, special serviceareas, and an elevator core (Fig. 2.1.4[a]). The corewas designed to transmit all horizontal loads to thefoundation. The use of integrated, loadbearing architecturalprecast spandrels and a precast concrete corefacilitated a tight construction schedule. The total precastconcrete structure was erected in only eight weekswith two cranes. The horizontal mass of the buildingis broken by expressed vertical pilasters (Fig. 2.1.4[b]),which break the building into a series of regular bays,highlighted by granite and concrete accent medallions.Details such as reveals and medallions also help to reducethe building�s scale and offer visual interest at thepedestrian level (Fig. 2.1.4[c]). The architect wanted tomaximize the window space while also maintaining aheavier, substantial wall form. This was achieved withthe detailing and implication of the beam-column lookof the precast concrete panels.