Set Selected Elements’ Reference Levels to Closer Level.

With this add-in, you will be able to set levels of elements by proximity criteria while keeping them at the current spatial position. It will deal with almost all elements such as walls, floors, roofs, railings, ceilings, conduits, ducts, pipes, cable trays, stairs, family instances like beams, pillars, etc...

This add-in will not be able to set the level of the reference level is set to workplane and it can't be changed manually.