I wish I could help, but I just want you to know that I totally feel your pain! We live in a first floor condo (now under contract, hurrah!!!) in our building, which is built of concrete. Floors are tile. Not only can we hear loud footsteps and yes, furniture moving on the 2nd floor, we can hear it in the other first-floor unit and even the third-floor unit! We don't hear much if anything when only our unit and the fourth floor are occupied, but that's rare.

The furniture moving is what gets me the most. It seems to be constant, and I wonder why no one else seems to use the pads under the chair and table legs. It drives me batty. Definitely a lesson learned -- I don't think I'd ever want to live in a condo again, but if I do, it will be top floor or BUST.

The only thing I know of is dropped acoustic ceilings like in offices, but they are very ugly, and unless you have 9' or higher ceilings in your unit are going to bring down the ceiling height too much. I sure do wish you luck. I assume moving is not an option?