Noisy neighbor: spoke w/ office, spoke in person, now what?

My wife and I are hoping to get suggestions from anyone who's maybe dealt with a similar situation...perhaps there's a suggestion we haven't tried.

We have a neighbor who lives above us who's exceedingly loud. We've rented for the better part of 10 years and know that noise, to some degree, is something you have to be prepared for. Unfortunately, this is out of the norm, and the worst we've had to deal with.

First off, he has hardwood floors with no carpeting (that we know of). That's not bad in and of itself, but he has cats. From what we can tell, either a) the floors are really thin or b) his cats are really heavy. We hear them...all day, and all night. Running to and fro on his floor, which is our ceiling. Okay, fine. He has cats, I guess we have to deal with that.

However, the thing that gets us the most is he comes home most every night between 12:30 and 1 am. We get up for work in the morning and this coincides with when we're going to bed. Once home, we have no idea what's going on up there, but to give you a point of reference in terms of noise level, it basically sounds like moving day, like someone's moving into the apartment above. Things drop, get slammed, things slide across the floor, etc. And this happens all the time. I won't say it happens every single night, but it wouldn't be an exaggeration to say it happens at least 4 nights out of a week. It's bewildering honestly. But mostly, it's just really loud.

We spoke with the leasing office/landlord's office. They suggested we try to handle it on our own by speaking with him. Okay. Fair enough and completely reasonable. So, we spoke with him face to face. He seemed genuinely sorry, but as my sitting here typing this might suggest, the noise has continued. Incessantly.

So, trying to be the good neighbors, we have resorted to turning a fan on every night for the better part of 8 months. Why? Because we're trying to be accommodating. We've used the background noise of the fan to help drown out the rumbling from above. This hasn't helped anyone but Con Edison. So, we're basically at our wits end. We don't want to be jerks, but we've come to realize that while we suck it up, we're making all the concessions and he's making none. That doesn't seem fair. He's going about his life, while ours is being constantly interrupted.

So, we've spoken with our landlord's office and we've spoken face to face, and yet we're still being driven crazy on a nightly basis between hearing his cats run up and down the apartment, and then his moving-day shenanigans.

Anyone else have any suggestions? Is this something we should just continue to put up with? Is it reasonable for us to have to climb out of bed, put on clothing and walk upstairs nightly at 1 am to make him aware, even after having already done so? Is there another alternative? Has anyone dealt with a similar situation, and if so, how did you handle it? We're just looking for advice. We want to be accommodating, but we also want a reasonably quiet living space. Thanks.