Also having this issue!
Floors are able to be changed. Doors and windows can be moved/sold. Items can be moved and sold.
When trying to paint (on any level, including the one under restricted) it says "You cannot makes changes other than the level designated by the gig."
Also new walls cannot be placed INSIDE, but can be placed outside (when restricted to the ground floor).
Hasn't seemed to affect the renovation scores (not sure how much build assets play into that vs. objects) if the other likes of the client are met.
I can change all furniture and flooring. Just can't paint walls, knock them down, or build new ones.
