I'm happy to share as much detail as you would like on these.
I used Octane Render for these, in it's AO mode (biased mode based on Ambient Occlusion). It's unbiased mode (PT) would have looked much better, especially if we'd had trees and sky, etc., but you can't beat the speed of AO. Frame time was about 20-35 seconds (depending on which shot) with all the cut away's turned on for the house.
Bongo was used of course with all the camera animation for both of these. The fade away wall sections were done in post and very easily. It's simply two renderings on top of one another with the "non cut away" fading from 0-100% Opacity on top of the "cut away" rendering. Super easy and quick to do. Plus it's very easy to control the timing of the fades this way. It was this same method repeated over and over in the videos.
For the second video, the rain and rain drops dripping down the drainage mats were done in post, using Hit Film Pro. I have AE but honestly like HF Pro more. It has an amazing particle engine perfect for doing things like rain drops, steam, etc. You can certainly do it in AE, but to me, it's much easier in HF, tons of control. The steam in the Tank Booster Pro video I posted was done in post in HF.
If you want any more details let me know, I'm happy to provide. These were both pretty simple video's. I'll make sure to head over to the Bongo site and upload these.