Submetering

[Christopher R.]

Hi! I'm looking at a quad which rents $750 each. Currently, the landlord pays the water/sewer which I think will cost around $50/unit/month. 

My realtor (who is also an investor and a property manager) says I can sub-meter this and have the tenants pay for the water without decreasing their rent. She says she's done it on 15 units in this street. The tenants allegedly did not leave. 

If I pay for the water, my cash-on-cash will be 7%.

If I am able to sub-meter without decreasing the rent,  and have tenants pay for the water, then the cash-on-cash will increase to 10.5%.

Should I buy this quad based on the potential cash on cash instead of the current one?