(I already own my primary residence and this will not be a house hack strategy)If I don't need 25% DP, what is the best amount of money to put as a down payment?

Hello my family  owns 2 acres of  land in South Carolina but we reside in NYC. 

It's just me; not a partnership, LLC, Inc, or anything else.My residence.

This includes education, cars, clothes, trips and your primary residence.6. 

To the point made above,people have to eat, but they also need a place to live. http://www.in2013dollars.com/Rent-of-primary-resid...Per these stats, while rents rise on average they still fall behind the rate of inflation.curiously enough the prices for housing changed faster than the rate of inflation:http://www.in2013dollars.com/Housing/price-inflati...great conversation topic.

Have you looked into using a HELOC on your personal residence or a 401k loan in order to invest further?

If you decide to hire a resident manager (instead of a property manager) you will be exposing your self to more liability and may have more work managing an employee who may not know how to manage an apartment building.

For students that have graduated, they have longer commitments, or residencies, which are one year plus.  

I currently reside in the Denver, CO area, but am originally from KC (Johnson County specifically).

Meaning primarily updated electrical, not having knob and tube, or 2 wire (as my personal residence does, built 1945).