They late cover how to calculate the pro-ration based on days or months   .    

The only solution is to take away their right to make discretionary decisions altogether – including decisions based on rational, nondiscriminatory considerations."

Agreeing on price is a start, after that you need to detail out who is going to pay the assessments, pro rations, etc.If you agree to terms verbally, you will need to present an offer with your earnest money check. 

That situation assumes your front door and back door debt to income ration allows you to get those loans.

Is trusting oral statements rational today - - statements from an unlicensed broker who needs to keep the end seller and buyer anonymous?

Do your inspections and make a rational decision based on the actual condition of the property...

But when I go to purchase my next property, how does the debt to income ration work?

A lot of things to think about and rationalize. 

Most customers are rational and all they want is to have their issue resolved.

(New asking price is $1,550k)@Joel Owens, you had previously mentioned that 3% vacancy loss is far from realistic considering 40% of this property's rent roll was office space (on 2nd floor).. note that this vacancy loss is not based on current available rent, its a de-ration to the current actual rented space (which there is 90% vacancy on current space)... so effectively there is a total ~13% vacancy loss considered.