Multiple lightmaps in one scene?

Hi everybody!

I have a scene when I toggle rooms on and off. Most of the lightmap static objects (like the shelf) are at the same place, but many small gameobjects are changing (green shapes).

So what I did is select all the rooms and toggle them on, have them all render on each other and then bake a lightmap, and it kinda works but then perhaps I can have a lightmap for each room? like spoken of in this answer

What do you think about my initial approach and about the multi lightmap approach?