identified as 156c the resulting single upper groove is identified as 158c and the single continuous flange is identified as 180c just as with regard to the previous embodiments described aperture or clearance 80c is adapted for the reception therein of locating member 74 at this point it should be made clear that the columns identified at 20 of fig1 and 2 may be identical to the columns 18 and for the purposes of fig1 and 2 they are identical however such corner or juncture columns may in fact assume different configurations to the extent that such configurations will accommodate a peripheral configuration of the building structure other than square or rectangular one of such columns is illustrated by fig1 and 18 column 20b of fig1 and 18 is illustrated as being comprised of a main vertically extending body portion 190 having axially extending legs 192 194 and 196 preferably formed integrally therewith and angularly spaced thereabout as for example at 120 u00b0 intervals legs 192 194 and 196 respectively terminate in aligned foot like portions 198 200 and 202 further grooves or recesses 204 206 and 208 are respectively formed in legs 192 194 and 196 in a manner as to extend downwardly into the respective aligned foot portions 198 200 and 202 similarly too as best shown in fig4 each of the foot portions 198 200 and 202 has a vertically extending slot 210 formed therein into which the grooves 204 206 and 208 respectively terminate the top of column 20b is preferably truncated as at 212 and provided with an upwardly extending locating member 214 received as within an axially extending tube 216 and which functions in the same manner as locating.