For example, a household that earns $85,000 per year has roughly a $7,000 gross monthly income.

As for the 3x rent question, I typically consider the entire "household's" income when dealing with this.

Their "friend" sold them a house in my market that they believed was going to give them a positive $400/month cash flow that they needed to support their household. 

@Max Householder I'm primarily looking in the Bevo and Dutchtown, but am unsure of the area.

The MSA has also been growing, with an estimated increase of around 9% between 2010 and 2020.The median household income in Fayetteville is around $47,000, which is lower than the national average.

It is zoned R-6, which I believe permits household living, but not group living.

Household debt is below the levels of the last housing downturn, average mortgage debt is below 40% of value leaving tremendous room for any housing correction to have very little effect on households.  

Step 5: Neighborhood Household IncomeGoal: Income needs to be between $40K-$70K This is ideal in order to generate the cap rate necessary for a successful syndication and stay above the increase in delinquency marker.

how can I use data to help me with apartment underwriting For example maybe population growth, poverty rate, unemployment rate, median household income.

In fact, many of the best tenants actually perform their own cleaning before they move their household goods in anyway.