And this low demand could be a couple of factors, either a rural location with low population density or the area incomes are not high enough in order to prevent a rent burdened scenario. 

Also, focus on 2 years of job/income stability.Class D Properties:Cashflow vs Appreciation: Typically, all cashflow with little, maybe even negative, relative rent & value appreciationVacancy Est: 20%+ should be used to cover nonpayment, evictions & damages.Tenant Pool: majority will have FICO scores under 560 (almost 30% probability of default), little to no good tradelines, lots of collections & chargeoffs, recent evictions.

It's mostly Class A properties, a few Class B.You may find the below copy & paste info useful in addressing your question:----------------------------------------------------------------------------------Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

Not a lot of our competitors offer this but it's something we can consider (but for us, it can't be in a rural area, the loan amount must exceed $150k, if we're using PadSplit income (or STR/MTR income) the max LTV is 75% and the down payment must come from your own funds). 

And I would love some passive income or at least someone to pay my mortgage until we can pay it off maybe.

I'd be heavily focused on mitigating that future tax liabilty rather than directly supplementing that income.

Figured there would be a few data points left out of the equation' that I would need to circle back with :) .There are additional units not rented at this time which could be rented to increase the income.

Income: Verified monthly income must be at least three times the rent (minimum $4,200 combined).

@Alec Barnes we use Debt-To-Income Ratio (DTI) instead of income = 3x rent.Reason?

If you did a cost segregation study on the property in the past, you may have to recapture the depreciation taken in the past.capital gain tax rates are 0, 15 or 20%There is also a potential 3.8% Net Investment Income Tax.Also, don't forget state income taxes depending on what state the property is located or your state of residency.Best of luck!