A support structure is provided for supporting the one end of a floor joist using a flush joist seat. The flush joist seat generally includes a generally horizontal plate having a first portion, a second portion, and a third portion. The first portion is welded to the top of the floor joist and the third portion rests on the top of the support structure. The second portion is located beyond the end of the floor joist, between the first portion and the second portion. A generally vertical plate extends downward from the second portion of the generally horizontal plate and is welded to a portion of the end of the floor joist.