You have a good start, but the fluid scale seems off compared to building size. You may want to try some alternate bakes with changes to real world size.
Mike Pan did what I would consider the most believable, large scale fluid simulation to date in Blender, and that was back in 2006! (Maybe even earlier).
You may have seen the video before:
Total simulation data was about 10 GB’s. I would recommend reading the description and comments and seeing if you can find any helpful information.