This is what I got till now:
- Construction cost is multiplied by 1.25
- Maintenance cost is divided by 5
- Electricity, Sewage (I guess), water consumption and garbage consumption is divided by 16.
- Capacity is the real capacity (or multiplied by 1)
God knows why. I'm sure this information is out there, because there are many mods and some are balanced, so a lot of people know that. Where the modders hang out? Not here, not in steam forum and definitely not on Reddit because there is way too many post per day to actually have any discussion.