Hi, i created a solution that could fit for your scene, please see attached Max file and image:
In this model the walls for each plant is a RailClone object that has only segments: The Wall (Default rule), and window module that is repeated, (Evenly rule). Also i added another object RC with the floor spacing, it could have been included in the wall, but separately becomes easier to change the material.
I left the first spline different because on the ground floor the front left side has other window style. All other splines are intances each other, so that when you change any of them, updating the entire building.
Regards, and I hope I've been helpful.