I give new agents or those desiring to get into real estate lists to call and then buy the deals they find. it works well. 

Unit A is about 100 years old and Unit B is almost completely new.Pros:-The duplex is in a very desirable neighborhood with home value appreciation year over year at about 50+%-Rent is also in high demand within this area-Cash flows well even with high interest rates and increasing property taxes-Home is price below average cost per sq ft-The house has been renovated and some parts of it has been remodeledCons:-All issues are with Unit A, the 100 year old unit.

I am not aware of any efficient way to filter through properties other than looking at all of the properties in your desired location, and checking to see if it has a basement apartment.

They need to be the kind of product that you believe is desirable to your customer base.

This city is desirable, I buy in good neighborhoods, etc.

I want to store my money in desirable hard assets.

The secret of getting ahead, is getting started.It is vital you connect with a realtor anywhere in the United States, who will take the time to understand your desired type of property and areas of the market you have been looking in.Learn about the good, bad, and ugly regarding distressed properties, whether due to  property condition or the chain of title.

.- 2-4br single family homes are super desirable among voucher holders. 

I am new to real estate investing and I have do have a deep desire to make it work.

If you really mean that all 4 of you are on title and mortgages for both properties, then you may want to look into methods to clean up title, if you desire to separate from each other.