We just received existing drawings. This area was modified in terms of who was handling the space quite a few times. Originally, it was retail shopping center (there was no load on the structural drawings - the joists were to be designed for a particular plf and the support joist girders had their panel point loads given. In addition, the minimum moment of inertia was given and running some quick calculations, it seems to be way lower than load prescribed - Was that a standard practice in the 1980s ?) . Later, it was changed to a food court (these drawings show 100 psf reducible LL - a new building was added on the outside and the floor was then cut in the area we are looking to add an elevator). Now it has become an office space.