You'll have a few options once they move out; you can increase the rent to cover the difference, have the studio metered separately or write a clause into your lease that they pay either a portion of electricity or that they pay 100% over a predetermined amount.

Our goal was to have had it paid or substantially reduce the principal within a predetermined time period of 10 years, but due to the crash it didn't work as we had planned.  

For change orders and mostly it is time and material COs (i have a clause in my contract that they can make 15% of material costs and 20% on labor and/or labor costs are also at a pre-determined rate), i will look at every cent.

As I will clearly state, obtaining an OO loan under false pretense with no intent to live there or a predetermined intent on immediatley leaving to rent out the unit would be a fraudulant act AS I UNDERSTAND IT.

I think a lot of people look at the topic from a fixed/predetermined mindset.

We set it up so that when the vent fan is turned off it stays on for a predetermined time before shutting off.

A mortgage pre-determines even payments so that principal+interest pays the loan off in a specific amount of time. 

I personally think entering into an agreement to buy without predetermined means is highly unethical.  

Today Many electric utilities have graded service rates to encourage efficiency and bill you at a higher per KW rate once you reach predetermined consumption thresholds.Likewise, some ISPs will bill you at a higher rate when you go over your package data threshold.If your ISP is blocking your traffic when you reach a threshold it's an indication they are infrastructure constrained - or "business constrained" - and you should be looking for a different provider.

@Marshall Hooper@Lynn Dee MurrowLynn's explanation is the basis of the inherited properties are stepped up to the market value at some predetermined date.