enclosed space extending substantially the entire length of each overall building type along the axii of one of the two structural grid systems established by bisectional design it should also be noted that the specific location of each plan view of fig1 b 20b amp 21b is indicated by two horizontal lines on each respective elevation of fig1 a 20a amp 21a with arrows pointing in the direction of the view in the simplex apartment or condominium tower of fig1 a and 19b in addition to the intermittent 4 story triangular cantilevers along one axial system a flat facade of extended floors 62 may be projected or hung in between the fundamental cantilevers of the other axial system in the hotel as shown in fig2 a and 20b a rounded facade of extended floors 64 may be projected or hung in between these fundamental cantilevers referring to fig2 a and 21b another variation of the triangular cantilever is indicated as it may be applied through bisectional design to an office building structure in this particular case two basically square tower structures are combined into one rectangular shaped building the basic facade of the rectangular building is herein shown as a flat conventional curtain wall system 66 following the axii of one structural grid system 70 the fundamental and intermittent cantilevers are shown projecting from this facade thus providing additional rentable space along a second axial grid system 68 by utilizing the same cantilevered proportions as heretofore mentioned throughout these.