Curious on Splitting Water

[Jacob Allweil]

I'm curious if anyone has experience splitting water in an apartment complex.  I'm looking to get an 11 unit and currently the utilities run about 25k per year.  I'm wondering how much it might be to split the water and pass that along to the tenant.  It is an old building so I'm guessing it'll be more than normal, and may want to get a plumber's consultation, but curious to hear people's thoughts if they've gone through this process, and possible hurdles they had or things they wish they would have known.

Best, 
Jack