We also provide water meter keys with every property so a tenant could shut off the water at the street in an emergency, probably faster than even the water department could get there. 

Did you check her ceiling with a moisture meter?  

The property is located in Will County Illinois and the provider is ComEd.When ComEd came out to the house to turn the power off they told my tenant they will not be turning it back on until the back box connecting the meter to the home is repaired.

The units are all metered so I am trying to understand any advantages of adding new windows besides them being "nice."

Oh, given the 2000 ft, 5 beds, and 2.5 bath, if there's only one gas/water/electric meter I can totally see u marketing it indeed to big families (these days multiple generations often combine households and rent out a whole house) as huge house with suite downstairs for extended family does seem attractive and likely brings in a rent premium; DC can't be too far away is it?

@Dan Bol Are the utilities individually metered?

If the utilities are separately metered, have the tenants put the utilities in their own name.

I used Sub Meter Solutions LLC.  

Also you want to know if the units are metered separately, at least electric!

If landlord claims to lease tenant an area of 1000 square meters but 400 square meters of the area belongs to another person, tenant only has to pay 60% of the rent.I hope this answers your question.